Metadata
| Key | Value |
|---|---|
| engine | modal |
| prompt | completion |
| temp | 0.2 |
| top_p | 0.95 |
| max_new_tokens | 1024 |
| n_completions | 10 |
Solutions
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) -> JSON? {
guard let data = string.data(using: .utf8) else {
return nil
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
return nil
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns nil in case of failures.
func parse(string: String) -> JSON? {
guard let data = string.data(using: .utf8) else {
return nil
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
return nil
}
}
```return try JSONSerialization.jsonObject(with: data, options: []) as! JSON // treating a forced downcast to 'JSON' (aka 'Dictionary<String, Any>') as optional will never produce 'nil'let result = try parse(string: string) // ambiguous use of 'parse(string:)'_ = try parse(string: string) // ambiguous use of 'parse(string:)'typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? JSON ?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
func parse(data: Data) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? JSON ?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
func encode(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8) ?? ""
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? JSON ?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
func parse(data: Data) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? JSON ?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
// JSON encoder, returns custom error type in case of failures.
func encode(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8) ?? ""
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data)
guard let result = json as? JSON else {
throw ParsingError.invalidInput
}
return result
} catch {
throw ParsingError.internalError(error)
}
}
func print(json: JSON) throws {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: .prettyPrinted)
guard let result = String(data: data, encoding: .utf8) else {
throw ParsingError.invalidInput
}
print(result)
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data)
guard let result = json as? JSON else {
throw ParsingError.invalidInput
}
return result
} catch {
throw ParsingError.internalError(error)
}
}
// JSON printer, returns custom error type in case of failures.
func print(json: JSON) throws {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: .prettyPrinted)
guard let result = String(data: data, encoding: .utf8) else {
throw ParsingError.invalidInput
}
print(result)
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let dictionary = json as? JSON else {
throw ParsingError.invalidInput
}
return dictionary
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let dictionary = json as? JSON else {
throw ParsingError.invalidInput
}
return dictionary
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? JSON ?? [:]
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? JSON ?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) -> JSON? {
guard let data = string.data(using: .utf8) else {
return nil
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? JSON
} catch {
return nil
}
}
func parse(data: Data) -> JSON? {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? JSON
} catch {
return nil
}
}
func parse(data: Data) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(url: URL) -> JSON? {
do {
return try JSONSerialization.jsonObject(with: Data(contentsOf: url), options: []) as? JSON
} catch {
return nil
}
}
func parse(url: URL) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: Data(contentsOf: url), options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(url: URL, options: JSONSerialization.ReadingOptions = []) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: Data(contentsOf: url), options: options) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(url: URL, options: JSONSerialization.ReadingOptions = []) -> JSON? {
do {
return try JSONSerialization.jsonObject(with: Data(contentsOf: url), options: options) as? JSON
} catch {
return nil
}
}
func parse(url: URL, options: JSONSerialization.ReadingOptions = [], completion: @escaping (JSON?, Error?) -> Void) {
DispatchQueue.global(qos: .background).async {
do {
let data = try Data(contentsOf: url)
let json = try JSONSerialization.jsonObject(with: data, options: options) as! JSON
DispatchQueue.main.async {
completion(json, nil)
}
} catch {
DispatchQueue.main.async {
completion(nil, error)
}
}
}
}
func parse(url: URL, options: JSONSerialization.ReadingOptions = [], completion: @escaping (JSON?, Error?) -> Void) {
DispatchQueue.global(qos: .background).async {
do {
let data = try Data(contentsOf: url)
let json = try JSONSerialization.jsonObject(with: data, options: options) as? JSON
DispatchQueue.main.async {
completion(json, nil)
}
} catch {
DispatchQueue.main.async {
completion(nil, error)
}
}
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns nil in case of failures.
func parse(string: String) -> JSON? {
guard let data = string.data(using: .utf8) else {
return nil
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? JSON
} catch {
return nil
}
}
// JSON parser, returns nil in case of failures.
func parse(data: Data) -> JSON? {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? JSON
} catch {
return nil
}
}
// JSON parser, returns custom error type in case of failures.
func parse(data: Data) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns nil in case of failures.
func parse(url: URL) -> JSON? {
do {
return try JSONSerialization.jsonObject(with: Data(contentsOf: url), options: []) as? JSON
} catch {
return nil
}
}
// JSON parser, returns custom error type in case of failures.
func parse(url: URL) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: Data(contentsOf: url), options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(url: URL, options: JSONSerialization.ReadingOptions = []) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: Data(contentsOf: url), options: options) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns nil in case of failures.
func parse(url: URL, options: JSONSerialization.ReadingOptions = []) -> JSON? {
do {
return try JSONSerialization.jsonObject(with: Data(contentsOf: url), options: options) as? JSON
} catch {
return nil
}
}
// JSON parser, returns custom error type in case of failures.
func parse(url: URL, options: JSONSerialization.ReadingOptions = [], completion: @escaping (JSON?, Error?) -> Void) {
DispatchQueue.global(qos: .background).async {
do {
let data = try Data(contentsOf: url)
let json = try JSONSerialization.jsonObject(with: data, options: options) as! JSON
DispatchQueue.main.async {
completion(json, nil)
}
} catch {
DispatchQueue.main.async {
completion(nil, error)
}
}
}
}
// JSON parser, returns nil in case of failures.
func parse(url: URL, options: JSONSerialization.ReadingOptions = [], completion: @escaping (JSON?, Error?) -> Void) {
DispatchQueue.global(qos: .background).async {
do {
let data = try Data(contentsOf: url)
let json = try JSONSerialization.jsonObject(with: data, options: options) as? JSON
DispatchQueue.main.async {
completion(json, nil)
}
} catch {
DispatchQueue.main.async {
completion(nil, error)
}
}
}
}
// JSON parser, returns custom error type in case of failures.
func parse(url: URL, options: JSONSerialization.ReadingOptions = [], completion: @escaping (JSON?, Error?) -> Void) {
DispatchQueue.global(qos: .background).async {
do {
let data = try Data(contentsOf: url)
let json = try JSONSerialization.jsonObject(with: data, options: options) as! JSON
DispatchQueue.main.async {
completion(json, nil)
}
} catch {
DispatchQueue.main.async {
completion(nil, error)
}func parse(url: URL, options: JSONSerialization.ReadingOptions = [], completion: @escaping (JSON?, Error?) -> Void) { // invalid redeclaration of 'parse(url:options:completion:)'let result = try parse(string: string) // ambiguous use of 'parse(string:)'_ = try parse(string: string) // ambiguous use of 'parse(string:)'typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let dictionary = json as? JSON else {
throw ParsingError.invalidInput
}
return dictionary
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let dictionary = json as? JSON else {
throw ParsingError.invalidInput
}
return dictionary
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let object = json as? JSON else {
throw ParsingError.invalidInput
}
return object
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let object = json as? JSON else {
throw ParsingError.invalidInput
}
return object
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data) as? JSON
return json ?? [:]
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data) as? JSON
return json ?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let dictionary = json as? JSON else {
throw ParsingError.invalidInput
}
return dictionary
} catch {
throw ParsingError.internalError(error)
}
}
func prettyPrint(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [.prettyPrinted])
guard let string = String(data: data, encoding: .utf8) else {
throw ParsingError.internalError(NSError())
}
return string
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let dictionary = json as? JSON else {
throw ParsingError.invalidInput
}
return dictionary
} catch {
throw ParsingError.internalError(error)
}
}
// JSON pretty printer, returns custom error type in case of failures.
func prettyPrint(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [.prettyPrinted])
guard let string = String(data: data, encoding: .utf8) else {
throw ParsingError.internalError(NSError())
}
return string
} catch {
throw ParsingError.internalError(error)
}
}
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name)\(attributesString ? " " : "")\(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name)\(attributesString ? " " : "")\(attributesString)>\(childrenString)</\(name)>"
}
}
let tree = HTMLNode.element("div", attributes: ["class": "container"], children: [
.element("a", attributes: ["href": "swifteval"])
])
print(generate(tree))
```return "<\(name)\(attributesString ? " " : "")\(attributesString)>\(childrenString)</\(name)>" // cannot convert value of type 'String' to expected condition type 'Bool'indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString.isEmpty ? "" : " ")\(attributesString)\(childrenString.isEmpty ? "" : ">\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString.isEmpty ? "" : " ")\(attributesString)\(childrenString.isEmpty ? "" : ">\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString.isEmpty ? "" : " ")\(attributesString)\(childrenString.isEmpty ? "" : ">\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString.isEmpty ? "" : " ")\(attributesString)\(childrenString.isEmpty ? "" : ">\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString.isEmpty ? "" : " ")\(attributesString)\(childrenString.isEmpty ? "" : ">\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString.isEmpty ? "" : " ")\(attributesString)\(childrenString.isEmpty ? "" : ">\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString.isEmpty ? "" : " ")\(attributesString)\(childrenString.isEmpty ? "" : ">\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString =return "<\(name)\(attributesString.isEmpty ? "" : " ")\(attributesString)\(childrenString.isEmpty ? "" : ">\(childrenString)</\(name)>" // cannot find ')' to match opening '(' in string interpolationreturn "<\(name)\(attributesString.isEmpty ? "" : " ")\(attributesString)\(childrenString.isEmpty ? "" : ">\(childrenString)</\(name)>" // unterminated string literalindirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var html = "<\(name)"
for (key, value) in attributes {
html += " \(key)=\"\(value)\""
}
html += ">"
for child in children {
html += generate(child)
}
html += "</\(name)>"
return html
}
}
func generate(_ tree: HTMLNode, _ indent: Int = 0) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var html = ""
for _ in 0..<indent {
html += " "
}
html += "<\(name)"
for (key, value) in attributes {
html += " \(key)=\"\(value)\""
}
html += ">\n"
for child in children {
html += generate(child, indent + 1)
}
for _ in 0..<indent {
html += " "
}
html += "</\(name)>\n"
return html
}
}
func generate(_ tree: HTMLNode, _ indent: Int = 0) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var html = ""
for _ in 0..<indent {
html += " "
}
html += "<\(name)"
for (key, value) in attributes {
html += " \(key)=\"\(value)\""
}
html += ">\n"
for child in children {
html += generate(child, indent + 1)
}
html += generate(tree, indent + 1)
for _ in 0..<indent {
html += " "
}
html += "</\(name)>\n"
return html
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var html = "<\(name)"
for (key, value) in attributes {
html += " \(key)=\"\(value)\""
}
html += ">"
for child in children {
html += generate(child)
}
html += "</\(name)>"
return html
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode, _ indent: Int = 0) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var html = ""
for _ in 0..<indent {
html += " "
}
html += "<\(name)"
for (key, value) in attributes {
html += " \(key)=\"\(value)\""
}
html += ">\n"
for child in children {
html += generate(child, indent + 1)
}
for _ in 0..<indent {
html += " "
}
html += "</\(name)>\n"
return html
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode, _ indent: Int = 0) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var html = ""
for _ in 0..<indent {
html += " "
}
html += "<\(name)"
for (key, value) in attributes {
html += " \(key)=\"\(value)\""
}
html += ">\n"
for child in children {
html += generate(child, indent + 1)
}
html += generate(tree, indent + 1)
for _ in 0..<indent {
html += " "
}
html += "</\(name)>\n"
return html
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode, _ indent: Int = 0) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var html = ""
for _ in 0..<indent {
html += " "
}
html += "<\(name)"
for (key, value) in attributes {
html += " \(key)=\"\(value)\""
}
html += ">\n"
for child in children {
html += generate(child, indent + 1)
}
for _ in 0..<indent {
html += " "
}
html += "</\(name)>\n"
return html
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode, _ indent: Int = 0) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var html = ""
for _ in 0..<indent {
html += " "
}
html += "<\(name)"
for (key, value) in attributes {
html += " \(key)=\"\(value)\""
}
html += ">\n"
for child in children {
html += generate(child, indent + 1)
}
for _ in 0..<indent {
html += " "
}
html += "</\(name)>\n"
return html
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode, _ indent: Int =func generate(_ tree: HTMLNode, _ indent: Int = 0) -> String { // invalid redeclaration of 'generate'indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
let html = generate(.element("div", children: [
.element("a", attributes: ["href": "swifteval"]),
.text("Hello, world!")
]))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree:indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
return "<\(name)\(attributes.map { " \($0)=\"\($1)\"" }.joined())>\(children.map(generate).joined())</\(name)>"
}
}
func generate(_ tree: HTMLNode, with indent: String = "") -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let indent = indent + " "
let children = children.map { generate($0, with: indent) }.joined()
return """
<\(name)\(attributes.map { " \($0)=\"\($1)\"" }.joined())>
\(children)
\(indent)</\(name)>
"""
}
}
func generate(_ tree: HTMLNode, with indent: String = "", using closure: (String) -> String) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let indent = indent + " "
let children = children.map { generate($0, with: indent, using: closure) }.joined()
return closure("""
<\(name)\(attributes.map { " \($0)=\"\($1)\"" }.joined())>
\(children)
\(indent)</\(name)>
""")
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
return "<\(name)\(attributes.map { " \($0)=\"\($1)\"" }.joined())>\(children.map(generate).joined())</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode, with indent: String = "") -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let indent = indent + " "
let children = children.map { generate($0, with: indent) }.joined()
return """
<\(name)\(attributes.map { " \($0)=\"\($1)\"" }.joined())>
\(children)
\(indent)</\(name)>
"""
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode, with indent: String = "", using closure: (String) -> String) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let indent = indent + " "
let children = children.map { generate($0, with: indent, using: closure) }.joined()
return closure("""
<\(name)\(attributes.map { " \($0)=\"\($1)\"" }.joined())>
\(children)
\(indent)</\(name)>
""")
}
}
let tree = HTMLNode.element(
"div",
attributes: ["class": "container"],
children: [
HTMLNode.element(
"a",
attributes: ["href": "swifteval"]
)
]
)
print(generate(tree))
print(generate(tree, with: " "))
print(generate(tree, with: " ") { $0 })
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
return "<\(name)\(attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " "))>\(children.map { generate($0) }.joined(separator: ""))</\(name)>"
}
}
func generate(_ tree: HTMLNode, indent: String = "") -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
return indent + "<\(name)\(attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " "))>\n" + children.map { generate($0, indent: indent + "\t") }.joined(separator: "\n") + "\n" + indent + "</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
return "<\(name)\(attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " "))>\(children.map { generate($0) }.joined(separator: ""))</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode, indent: String = "") -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
return indent + "<\(name)\(attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " "))>\n" + children.map { generate($0, indent: indent + "\t") }.joined(separator: "\n") + "\n" + indent + "</\(name)>"
}
}
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"]),
HTMLNode.text("some text")
])
print(generate(tree))
print(generate(tree, indent: " "))
```Start: a ["href": "swifteval"] // XCTAssertEqual failed: (Start: div [:]indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
let tree = HTMLNode.element("div", attributes: ["id": "container"], children: [
.element("a", attributes: ["href": "swifteval"]),
.text("Hello, "),
.element("b", children: [
.text("Swift"),
.text("Eval")
])
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
//enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var tokens = string.components(separatedBy: CharacterSet.whitespaces)
guard tokens.count > 0 else {
throw CalculateError.invalidInput
}
var stack = [Double]()
while !tokens.isEmpty {
guard let token = tokens.removeFirst() else {
throw CalculateError.invalidInput
}
if let operand = Double(token) {
stack.append(operand)
} else {
let b = stack.popLast()!
let a = stack.popLast()!
switch token {
case "+": stack.append(a + b)
case "-": stack.append(a - b)
case "*": stack.append(a * b)
case "/": stack.append(a / b)
case "(": stack.append(a)
case ")": break
default: throw CalculateError.invalidInput
}
}
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack.popLast()!
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var tokens = string.components(separatedBy: CharacterSet.whitespaces)
guard tokens.count > 0 else {
throw CalculateError.invalidInput
}
var stack = [Double]()
while !tokens.isEmpty {
guard let token = tokens.removeFirst() else {
throw CalculateError.invalidInput
}
if let operand = Double(token) {
stack.append(operand)
} else {
let b = stack.popLast()!
let a = stack.popLast()!
switch token {
case "+": stack.append(a + b)
case "-": stack.append(a - b)
case "*": stack.append(a * b)
case "/": stack.append(a / b)
case "(": stack.append(a)
case ")": break
default: throw CalculateError.invalidInput
}
}
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack.popLast()!
}
```guard let token = tokens.removeFirst() else { // initializer for conditional binding must have Optional type, not 'String'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
let numbers = tokens.map { Double($0) ?? nil }.compactMap { $0 }
let operators = tokens.filter { $0 != "" }.map { $0.first! }
guard numbers.count == operators.count + 1 else { throw CalculateError.invalidInput }
let result = calculate(numbers, operators)
return result
}
func calculate(_ numbers: [Double], _ operators: [Character]) -> Double {
var numbers = numbers
var operators = operators
while operators.contains("*") || operators.contains("/") {
if let index = operators.firstIndex(of: "*") {
numbers[index] = numbers[index] * numbers[index + 1]
numbers.remove(at: index + 1)
operators.remove(at: index)
} else if let index = operators.firstIndex(of: "/") {
numbers[index] = numbers[index] / numbers[index + 1]
numbers.remove(at: index + 1)
operators.remove(at: index)
}
}
while operators.contains("+") || operators.contains("-") {
if let index = operators.firstIndex(of: "+") {
numbers[index] = numbers[index] + numbers[index + 1]
numbers.remove(at: index + 1)
operators.remove(at: index)
} else if let index = operators.firstIndex(of: "-") {
numbers[index] = numbers[index] - numbers[index + 1]
numbers.remove(at: index + 1)
operators.remove(at: index)
}
}
return numbers[0]
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
let numbers = tokens.map { Double($0) ?? nil }.compactMap { $0 }
let operators = tokens.filter { $0 != "" }.map { $0.first! }
guard numbers.count == operators.count + 1 else { throw CalculateError.invalidInput }
let result = calculate(numbers, operators)
return result
}
func calculate(_ numbers: [Double], _ operators: [Character]) -> Double {
var numbers = numbers
var operators = operators
while operators.contains("*") || operators.contains("/") {
if let index = operators.firstIndex(of: "*") {
numbers[index] = numbers[index] * numbers[index + 1]
numbers.remove(at: index + 1)
operators.remove(at: index)
} else if let index = operators.firstIndex(of: "/") {
numbers[index] = numbers[index] / numbers[index + 1]
numbers.remove(at: index + 1)
operators.remove(at: index)
}
}
while operators.contains("+") || operators.contains("-") {
if let index = operators.firstIndex(of: "+") {
numbers[index] = numbers[index] + numbers[index + 1]
numbers.remove(at: index + 1)
operators.remove(at: index)
} else if let index = operators.firstIndex(of: "-") {
numbers[index] = numbers[index] - numbers[index + 1]
numbers.remove(at: index + 1)
operators.remove(at: index)
}
}
return numbers[0]
}
func testCalculate() {
let tests = [
"2+2*2": 6,
"2+2*2-2": 4,
"2+2*2-2*2": 2,
"2+2*2-2*2*2": -2,
"2+2*2-2*2*2*2": -10,
"2+2*2-2*2*2*2*2": -22,
"2+2*2-2*2*2*2*2*2": -46,
"2+2*2-2*2*2*2*2*2*2": -90,
"2+2*2-2*2*2*2*2*2*2*2": -154,
"2+2*2-2*2*2*2*2*2*2*2*2": -238,
"2+2*2-2*2*2*2*2*2*2*2*2*2": -342,
"2+2*2-2*2*2*2*2*2*2*2*2*2*2": -470,
"2+2*2-2*2*2*2*2*2*2*2*2*2*2*2": -626,
"2+2*2-2*2*2*2*2*2*2*2*2*2*2*2*2": -814,
"2+2*2-2*2*2*2*2*2*2*2*2*2*2*2*2*2": -1042,
"2+2*2-2*2*2*2*2*2*2*2*2*2*2*2*2*2*2": -1310,
"2+2*2-2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2": -1628,
"2+2*2-2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2": -1996,
"2+2*2-2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2": -2414 // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var tokens = string.split(separator: " ")
var stack = [Double]()
// Check if the input is valid.
if tokens.count % 2 == 0 {
throw CalculateError.invalidInput
}
// Calculate the result.
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else {
guard let a = stack.popLast(), let b = stack.popLast() else {
throw CalculateError.invalidInput
}
switch token {
case "+":
stack.append(b + a)
case "-":
stack.append(b - a)
case "*":
stack.append(b * a)
case "/":
stack.append(b / a)
default:
throw CalculateError.invalidInput
}
}
}
// Check if the input is valid.
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.first!
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var tokens = string.split(separator: " ")
var stack = [Double]()
// Check if the input is valid.
if tokens.count % 2 == 0 {
throw CalculateError.invalidInput
}
// Calculate the result.
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else {
guard let a = stack.popLast(), let b = stack.popLast() else {
throw CalculateError.invalidInput
}
switch token {
case "+":
stack.append(b + a)
case "-":
stack.append(b - a)
case "*":
stack.append(b * a)
case "/":
stack.append(b / a)
default:
throw CalculateError.invalidInput
}
}
}
// Check if the input is valid.
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.first!
}
```var tokens = string.split(separator: " ") // variable 'tokens' was never mutated; consider changing to 'let' constant // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var tokens = string.components(separatedBy: .whitespaces)
let result = try calculate(tokens)
if !tokens.isEmpty {
throw CalculateError.invalidInput
}
return result
}
func calculate(_ tokens: inout [String]) throws -> Double {
var result = 0.0
var operatorStack = [String]()
var operandStack = [Double]()
while !tokens.isEmpty {
let token = tokens.removeFirst()
switch token {
case "+", "-", "*", "/":
operatorStack.append(token)
case "(":
let subResult = try calculate(&tokens)
operandStack.append(subResult)
case ")":
let operatorToken = operatorStack.removeLast()
let operand = operandStack.removeLast()
let result = calculate(operatorToken, operand: operand)
operandStack.append(result)
default:
if let double = Double(token) {
operandStack.append(double)
} else {
throw CalculateError.invalidInput
}
}
}
while !operatorStack.isEmpty {
let operatorToken = operatorStack.removeLast()
let operand = operandStack.removeLast()
let result = calculate(operatorToken, operand: operand)
operandStack.append(result)
}
if let result = operandStack.first {
return result
} else {
throw CalculateError.invalidInput
}
}
func calculate(_ operatorToken: String, operand: Double) -> Double {
switch operatorToken {
case "+":
return operand + operandStack.removeLast()
case "-":
return operandStack.removeLast() - operand
case "*":
return operand * operandStack.removeLast()
case "/":
return operandStack.removeLast() / operand
default:
fatalError()
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var tokens = string.components(separatedBy: .whitespaces)
let result = try calculate(tokens)
if !tokens.isEmpty {
throw CalculateError.invalidInput
}
return result
}
// Calculate the result of tokens.
// Tokens is a list of tokens, each token is a string.
// Example input is ["2", "+", "2", "*", "2"].
func calculate(_ tokens: inout [String]) throws -> Double {
var result = 0.0
var operatorStack = [String]()
var operandStack = [Double]()
while !tokens.isEmpty {
let token = tokens.removeFirst()
switch token {
case "+", "-", "*", "/":
operatorStack.append(token)
case "(":
let subResult = try calculate(&tokens)
operandStack.append(subResult)
case ")":
let operatorToken = operatorStack.removeLast()
let operand = operandStack.removeLast()
let result = calculate(operatorToken, operand: operand)
operandStack.append(result)
default:
if let double = Double(token) {
operandStack.append(double)
} else {
throw CalculateError.invalidInput
}
}
}
while !operatorStack.isEmpty {
let operatorToken = operatorStack.removeLast()
let operand = operandStack.removeLast()
let result = calculate(operatorToken, operand: operand)
operandStack.append(result)
}
if let result = operandStack.first {
return result
} else {
throw CalculateError.invalidInput
}
}
// Calculate the result of operator and operand.
func calculate(_ operatorToken: String, operand: Double) -> Double {
switch operatorToken {
case "+":
return operand + operandStack.removeLast()
case "-":
return operandStack.removeLast() - operand
case "*":
return operand * operandStack.removeLast()
case "/":
return operandStack.removeLast() / operand
default:
fatalError()
}
}
```let result = try calculate(tokens) // passing value of type '[String]' to an inout parameter requires explicit '&'var result = 0.0 // initialization of variable 'result' was never used; consider replacing with assignment to '_' or removing itreturn operand + operandStack.removeLast() // cannot find 'operandStack' in scopereturn operandStack.removeLast() - operand // cannot find 'operandStack' in scopereturn operand * operandStack.removeLast() // cannot find 'operandStack' in scopereturn operandStack.removeLast() / operand // cannot find 'operandStack' in scopeenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var tokens = string.components(separatedBy: .whitespaces)
let result = try calculate(tokens)
if !tokens.isEmpty {
throw CalculateError.invalidInput
}
return result
}
func calculate(_ tokens: inout [String]) throws -> Double {
var result = try calculate(tokens, precedence: 0)
while !tokens.isEmpty {
let token = tokens.removeFirst()
if token == "(" {
result = try calculate(tokens, precedence: 0)
} else {
throw CalculateError.invalidInput
}
}
return result
}
func calculate(_ tokens: inout [String], precedence: Int) throws -> Double {
var result = try calculate(tokens, precedence: precedence + 1)
while !tokens.isEmpty {
let token = tokens.removeFirst()
if token == ")" {
return result
} else if let operatorPrecedence = operatorPrecedence(token) {
if operatorPrecedence <= precedence {
throw CalculateError.invalidInput
}
let operand = try calculate(tokens, precedence: operatorPrecedence)
result = try applyOperator(token, left: result, right: operand)
} else {
throw CalculateError.invalidInput
}
}
return result
}
func calculate(_ tokens: inout [String], precedence: Int, isLeft: Bool) throws -> Double {
var result = try calculate(tokens, precedence: precedence + 1, isLeft: isLeft)
while !tokens.isEmpty {
let token = tokens.removeFirst()
if token == ")" {
return result
} else if let operatorPrecedence = operatorPrecedence(token) {
if operatorPrecedence <= precedence {
throw CalculateError.invalidInput
}
let operand = try calculate(tokens, precedence: operatorPrecedence, isLeft: isLeft)
result = try applyOperator(token, left: result, right: operand)
} else {
throw CalculateError.invalidInput
}
}
return result
}
func calculate(_ tokens: inout [String], precedence: Int, isLeft: Bool, isRight: Bool) throws -> Double {
var result = try calculate(tokens, precedence: precedence + 1, isLeft: isLeft, isRight: isRight)
while !tokens.isEmpty {
let token = tokens.removeFirst()
if token == ")" {
return result
} else if let operatorPrecedence = operatorPrecedence(token) {
if operatorPrecedence <= precedence {
throw CalculateError.invalidInput
}
let operand = try calculate(tokens, precedence: operatorPrecedence, isLeft: isLeft, isRight: isRight)
result = try applyOperator(token, left: result, right: operand)
} else {
throw CalculateError.invalidInput
}
}
return result
}
func calculate(_ tokens: inout [String], precedence: Int, isLeft: Bool, isRight: Bool, isUnary: Bool) throws -> Double {
var result = try calculate(tokens, precedence: precedence + 1, isLeft: isLeft, isRight: isRight, isUnary: isUnary)
while !tokens.isEmpty {
let token = tokens.removeFirst()
if token == ")" {
return result
} else if let operatorPrecedence = operatorPrecedence(token) {
if operatorPrecedence <= precedence {
throw CalculateError.invalidInput
}
let operand = try calculate(tokens, precedence: operatorPrecedence, isLeft: isLeft, isRight: isRight, isUnary: isUnary)
result = try applyOperator(token, left: result, right: operand)
} else {
throw CalculateError.invalidInput
}
}
return result
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var tokens = string.components(separatedBy: .whitespaces)
let result = try calculate(tokens)
if !tokens.isEmpty {
throw CalculateError.invalidInput
}
return result
}
func calculate(_ tokens: inout [String]) throws -> Double {
var result = try calculate(tokens, precedence: 0)
while !tokens.isEmpty {
let token = tokens.removeFirst()
if token == "(" {
result = try calculate(tokens, precedence: 0)
} else {
throw CalculateError.invalidInput
}
}
return result
}
func calculate(_ tokens: inout [String], precedence: Int) throws -> Double {
var result = try calculate(tokens, precedence: precedence + 1)
while !tokens.isEmpty {
let token = tokens.removeFirst()
if token == ")" {
return result
} else if let operatorPrecedence = operatorPrecedence(token) {
if operatorPrecedence <= precedence {
throw CalculateError.invalidInput
}
let operand = try calculate(tokens, precedence: operatorPrecedence)
result = try applyOperator(token, left: result, right: operand)
} else {
throw CalculateError.invalidInput
}
}
return result
}
func calculate(_ tokens: inout [String], precedence: Int, isLeft: Bool) throws -> Double {
var result = try calculate(tokens, precedence: precedence + 1, isLeft: isLeft)
while !tokens.isEmpty {
let token = tokens.removeFirst()
if token == ")" {
return result
} else if let operatorPrecedence = operatorPrecedence(token) {
if operatorPrecedence <= precedence {
throw CalculateError.invalidInput
}
let operand = try calculate(tokens, precedence: operatorPrecedence, isLeft: isLeft)
result = try applyOperator(token, left: result, right: operand)
} else {
throw CalculateError.invalidInput
}
}
return result
}
func calculate(_ tokens: inout [String], precedence: Int, isLeft: Bool, isRight: Bool) throws -> Double {
var result = try calculate(tokens, precedence: precedence + 1, isLeft: isLeft, isRight: isRight)
while !tokens.isEmpty {
let token = tokens.removeFirst()
if token == ")" {
return result
} else if let operatorPrecedence = operatorPrecedence(token) {
if operatorPrecedence <= precedence {
throw CalculateError.invalidInput
}
let operand = try calculate(tokens, precedence: operatorPrecedence, isLeft: isLeft, isRight: isRight)
result = try applyOperator(token, left: result, right: operand)
} else {
throw CalculateError.invalidInput
}
}
return result
}
func calculate(_ tokens: inout [String], precedence: Int, isLeft: Bool, isRight: Bool, isUnary: Bool) throws -> Double {
var result = try calculate(tokens, precedence: precedence + 1, isLeft: isLeft, isRight: isRight, isUnary: isUnary)
while !tokens.isEmpty {
let token = tokens.removeFirst()
if token == ")" {
return result
} else if let operatorPrecedence = operatorPrecedence(token) {
if operatorPrecedence <= precedence {
throw CalculateError.invalidInput
}
let operand = try calculate(tokens, precedence: operatorPrecedence, isLeft: isLeft, isRight: isRight, isUnary: isUnary)
result = try applyOperator(token, left: result, right: operand)
} else {
throw CalculateError.invalidInput
}
}
return result
}
func calculate(_ tokens: inout [String], precedence: Int, isLeft: Bool, isRight: Bool, isUnary: Bool, isBinary: Bool) throws -> Double {
var result = try calculate(tokens, precedence: precedence + 1, isLeft: isLeft, isRight: isRight, isUnary: isUnary, isBinary: isBinary)
while !tokens.isEmpty {
let token = tokens.removeFirst()
if token == ")" {
return result
} else if let operatorPrecedence = operatorPrecedence(token) {
if operatorPrecedencelet result = try calculate(tokens) // passing value of type '[String]' to an inout parameter requires explicit '&'var result = try calculate(tokens, precedence: 0) // passing value of type '[String]' to an inout parameter requires explicit '&'result = try calculate(tokens, precedence: 0) // passing value of type '[String]' to an inout parameter requires explicit '&'var result = try calculate(tokens, precedence: precedence + 1) // passing value of type '[String]' to an inout parameter requires explicit '&'} else if let operatorPrecedence = operatorPrecedence(token) { // cannot find 'operatorPrecedence' in scopelet operand = try calculate(tokens, precedence: operatorPrecedence) // passing value of type '[String]' to an inout parameter requires explicit '&'result = try applyOperator(token, left: result, right: operand) // cannot find 'applyOperator' in scopevar result = try calculate(tokens, precedence: precedence + 1, isLeft: isLeft) // passing value of type '[String]' to an inout parameter requires explicit '&'} else if let operatorPrecedence = operatorPrecedence(token) { // cannot find 'operatorPrecedence' in scopelet operand = try calculate(tokens, precedence: operatorPrecedence, isLeft: isLeft) // passing value of type '[String]' to an inout parameter requires explicit '&'result = try applyOperator(token, left: result, right: operand) // cannot find 'applyOperator' in scopevar result = try calculate(tokens, precedence: precedence + 1, isLeft: isLeft, isRight: isRight) // passing value of type '[String]' to an inout parameter requires explicit '&'} else if let operatorPrecedence = operatorPrecedence(token) { // cannot find 'operatorPrecedence' in scopelet operand = try calculate(tokens, precedence: operatorPrecedence, isLeft: isLeft, isRight: isRight) // passing value of type '[String]' to an inout parameter requires explicit '&'result = try applyOperator(token, left: result, right: operand) // cannot find 'applyOperator' in scopevar result = try calculate(tokens, precedence: precedence + 1, isLeft: isLeft, isRight: isRight, isUnary: isUnary) // passing value of type '[String]' to an inout parameter requires explicit '&'} else if let operatorPrecedence = operatorPrecedence(token) { // cannot find 'operatorPrecedence' in scopelet operand = try calculate(tokens, precedence: operatorPrecedence, isLeft: isLeft, isRight: isRight, isUnary: isUnary) // passing value of type '[String]' to an inout parameter requires explicit '&'result = try applyOperator(token, left: result, right: operand) // cannot find 'applyOperator' in scopeenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
guard tokens.count % 2 == 1 else {
throw CalculateError.invalidInput
}
var stack: [Double] = []
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else {
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
switch token {
case "+":
stack.append(a + b)
case "-":
stack.append(a - b)
case "*":
stack.append(a * b)
case "/":
stack.append(a / b)
default:
throw CalculateError.invalidInput
}
}
}
return stack.first!
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
guard tokens.count % 2 == 1 else {
throw CalculateError.invalidInput
}
var stack: [Double] = []
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else {
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
switch token {
case "+":
stack.append(a + b)
case "-":
stack.append(a - b)
case "*":
stack.append(a * b)
case "/":
stack.append(a / b)
default:
throw CalculateError.invalidInput
}
}
}
return stack.first!
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted)
guard tokens.count == 1 else {
throw CalculateError.invalidInput
}
let number = Double(tokens[0])
guard let number = number else {
throw CalculateError.invalidInput
}
return number
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted)
guard tokens.count == 1 else {
throw CalculateError.invalidInput
}
let number = Double(tokens[0])
guard let number = number else {
throw CalculateError.invalidInput
}
return number
}
```var tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted) // variable 'tokens' was never mutated; consider changing to 'let' constant // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
guard tokens.count % 2 == 1 else {
throw CalculateError.invalidInput
}
var stack = [Double]()
for token in tokens {
switch token {
case "+", "-", "*", "/":
guard let operand2 = stack.popLast(),
let operand1 = stack.popLast() else {
throw CalculateError.invalidInput
}
let result = calculate(operand1, token, operand2)
stack.append(result)
default:
guard let value = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(value)
}
}
guard let result = stack.popLast() else {
throw CalculateError.invalidInput
}
return result
}
func calculate(_ operand1: Double, _ operator: String, _ operand2: Double) -> Double {
switch @autoclosure { () -> String in operator }() {
case "+": return operand1 + operand2
case "-": return operand1 - operand2
case "*": return operand1 * operand2
case "/": return operand1 / operand2
default: fatalError("Unsupported operator: \(operator)")
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
guard tokens.count % 2 == 1 else {
throw CalculateError.invalidInput
}
var stack = [Double]()
for token in tokens {
switch token {
case "+", "-", "*", "/":
guard let operand2 = stack.popLast(),
let operand1 = stack.popLast() else {
throw CalculateError.invalidInput
}
let result = calculate(operand1, token, operand2)
stack.append(result)
default:
guard let value = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(value)
}
}
guard let result = stack.popLast() else {
throw CalculateError.invalidInput
}
return result
}
// Calculate two operands with operator.
func calculate(_ operand1: Double, _ operator: String, _ operand2: Double) -> Double {
switch @autoclosure { () -> String in operator }() {
case "+": return operand1 + operand2
case "-": return operand1 - operand2
case "*": return operand1 * operand2
case "/": return operand1 / operand2
default: fatalError("Unsupported operator: \(operator)")
}
}
```let result = calculate(operand1, token, operand2) // cannot convert value of type 'String.SubSequence' (aka 'Substring') to expected argument type 'String'switch @autoclosure { () -> String in operator }() { // expected expression in 'switch' statementenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var tokens = string.split(separator: " ")
var result = Double(tokens.removeFirst()) ?? 0
while tokens.count > 0 {
let token = tokens.removeFirst()
if let number = Double(token) {
result = calculate(result, token: token, number: number)
} else {
result = calculate(result, token: token)
}
}
return result
}
func calculate(_ left: Double, token: String, number: Double) -> Double {
switch token {
case "+":
return left + number
case "-":
return left - number
case "*":
return left * number
case "/":
return left / number
default:
return 0
}
}
func calculate(_ left: Double, token: String) -> Double {
switch token {
case "+":
return left + left
case "-":
return left - left
case "*":
return left * left
case "/":
return left / left
default:
return 0
}
}
func main() {
print("Enter a string to calculate")
while let input = readLine() {
do {
print("Result is \(try calculate(input))")
} catch CalculateError.invalidInput {
print("Invalid input")
} catch {
print("Error: \(error)")
}
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var tokens = string.split(separator: " ")
var result = Double(tokens.removeFirst()) ?? 0
while tokens.count > 0 {
let token = tokens.removeFirst()
if let number = Double(token) {
result = calculate(result, token: token, number: number)
} else {
result = calculate(result, token: token)
}
}
return result
}
// Calculate result of two numbers with given token.
func calculate(_ left: Double, token: String, number: Double) -> Double {
switch token {
case "+":
return left + number
case "-":
return left - number
case "*":
return left * number
case "/":
return left / number
default:
return 0
}
}
// Calculate result of two numbers with given token.
func calculate(_ left: Double, token: String) -> Double {
switch token {
case "+":
return left + left
case "-":
return left - left
case "*":
return left * left
case "/":
return left / left
default:
return 0
}
}
func main() {
print("Enter a string to calculate")
while let input = readLine() {
do {
print("Result is \(try calculate(input))")
} catch CalculateError.invalidInput {
print("Invalid input")
} catch {
print("Error: \(error)")
}
}
}
main()
```result = calculate(result, token: token, number: number) // cannot convert value of type 'String.SubSequence' (aka 'Substring') to expected argument type 'String'result = calculate(result, token: token) // cannot convert value of type 'String.SubSequence' (aka 'Substring') to expected argument type 'String'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
guard tokens.count % 2 == 1 else {
throw CalculateError.invalidInput
}
var stack = [Double]()
var i = 0
while i < tokens.count {
let token = tokens[i]
switch token {
case "+":
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b + a)
case "-":
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b - a)
case "*":
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b * a)
case "/":
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b / a)
default:
guard let value = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(value)
}
i += 1
}
return stack.first!
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
guard tokens.count % 2 == 1 else {
throw CalculateError.invalidInput
}
var stack = [Double]()
var i = 0
while i < tokens.count {
let token = tokens[i]
switch token {
case "+":
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b + a)
case "-":
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b - a)
case "*":
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b * a)
case "/":
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b / a)
default:
guard let value = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(value)
}
i += 1
}
return stack.first!
}
// Test
do {
let result = try calculate("2 + 2 * 2")
print("2 + 2 * 2 = \(result)")
} catch {
print(error)
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputfunc execute(binary: String, arguments: [String]) -> (String, String) {
let process = Process()
process.executableURL = URL(fileURLWithPath: binary)
process.arguments = arguments
let pipe = Pipe()
process.standardOutput = pipe
process.standardError = pipe
process.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, process.terminationStatus == 0 ? "" : output)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let process = Process()
process.executableURL = URL(fileURLWithPath: binary)
process.arguments = arguments
let pipe = Pipe()
process.standardOutput = pipe
process.standardError = pipe
process.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, process.terminationStatus == 0 ? "" : output)
}
```func execute(binary: String, arguments: [String]) -> (String, String) {
let process = Process()
let pipe = Pipe()
process.standardOutput = pipe
process.arguments = arguments
process.launchPath = binary
process.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
process.waitUntilExit()
return (output, String(process.terminationStatus))
}
func execute(binary: String, arguments: [String], input: String) -> (String, String) {
let process = Process()
let pipe = Pipe()
process.standardOutput = pipe
process.standardInput = pipe
process.arguments = arguments
process.launchPath = binary
process.launch()
process.standardInput?.write(input.data(using: .utf8)!)
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
process.waitUntilExit()
return (output, String(process.terminationStatus))
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let process = Process()
let pipe = Pipe()
process.standardOutput = pipe
process.arguments = arguments
process.launchPath = binary
process.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
process.waitUntilExit()
return (output, String(process.terminationStatus))
}
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String], input: String) -> (String, String) {
let process = Process()
let pipe = Pipe()
process.standardOutput = pipe
process.standardInput = pipe
process.arguments = arguments
process.launchPath = binary
process.launch()
process.standardInput?.write(input.data(using: .utf8)!)
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
process.waitUntilExit()
return (output, String(process.terminationStatus))
}
```process.standardInput?.write(input.data(using: .utf8)!) // value of type 'Any' has no member 'write'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let pipe2 = Pipe()
task.standardError = pipe2
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let data2 = pipe2.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
let error = String(data: data2, encoding: .utf8)!
return (output, error)
}
func execute(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).0
}
func execute(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).1
}
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let pipe2 = Pipe()
task.standardError = pipe2
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let data2 = pipe2.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
let error = String(data: data2, encoding: .utf8)!
return (output, error)
}
// Function to execute binary with arguments and return stdout.
func execute(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).0
}
// Function to execute binary with arguments and return stderr.
func execute(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).1
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
// Function to execute binary with arguments and returnfunc execute(binary: String, arguments: [String]) -> String { // invalid redeclaration of 'execute(binary:arguments:)'func execute(binary: String, arguments: [String]) -> (String, String) { // invalid redeclaration of 'execute(binary:arguments:)'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launchPath = binary
task.arguments = arguments
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return (output, output)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launchPath = binary
task.arguments = arguments
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return (output, output)
}
``` // XCTAssertEqual failed: (Hello!) is not equal to ()func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
let pipe = Pipe()
let pipeErr = Pipe()
task.standardOutput = pipe
task.standardError = pipeErr
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let dataErr = pipeErr.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
let error = String(data: dataErr, encoding: .utf8)!
return (output, error)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
let pipe = Pipe()
let pipeErr = Pipe()
task.standardOutput = pipe
task.standardError = pipeErr
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let dataErr = pipeErr.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
let error = String(data: dataErr, encoding: .utf8)!
return (output, error)
}
``` // XCTAssertEqual failed: () is not equal to (Hello!)func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.arguments = arguments
task.launchPath = binary
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
task.waitUntilExit()
return (output, String(task.terminationStatus))
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.arguments = arguments
task.launchPath = binary
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
task.waitUntilExit()
return (output, String(task.terminationStatus))
}
``` // XCTAssertEqual failed: (0) is not equal to ()func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let stdout = Pipe()
task.standardOutput = stdout
let stderr = Pipe()
task.standardError = stderr
task.launch()
task.waitUntilExit()
let data = stdout.fileHandleForReading.readDataToEndOfFile()
let stdoutString = String(data: data, encoding: .utf8)!
let data2 = stderr.fileHandleForReading.readDataToEndOfFile()
let stderrString = String(data: data2, encoding: .utf8)!
return (stdoutString, stderrString)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let stdout = Pipe()
task.standardOutput = stdout
let stderr = Pipe()
task.standardError = stderr
task.launch()
task.waitUntilExit()
let data = stdout.fileHandleForReading.readDataToEndOfFile()
let stdoutString = String(data: data, encoding: .utf8)!
let data2 = stderr.fileHandleForReading.readDataToEndOfFile()
let stderrString = String(data: data2, encoding: .utf8)!
return (stdoutString, stderrString)
}
```func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
let pipe = Pipe()
let pipeErr = Pipe()
task.launchPath = binary
task.arguments = arguments
task.standardOutput = pipe
task.standardError = pipeErr
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let dataErr = pipeErr.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
let outputErr = String(data: dataErr, encoding: .utf8)!
return (output, outputErr)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
let pipe = Pipe()
let pipeErr = Pipe()
task.launchPath = binary
task.arguments = arguments
task.standardOutput = pipe
task.standardError = pipeErr
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let dataErr = pipeErr.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
let outputErr = String(data: dataErr, encoding: .utf8)!
return (output, outputErr)
}
```func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return (output, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return (output, "")
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.arguments = arguments
task.launchPath = binary
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.arguments = arguments
task.launchPath = binary
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}
``` // XCTAssertTrue failedfunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let cached = cache[input] {
return cached
} else {
let result = function(input)
cache[input] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let cached = cache[input] {
return cached
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
// Example usage
let fibonacci: (Int) -> Int = { n in
if n <= 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
let memoizedFibonacci = memoize(fibonacci)
print(memoizedFibonacci(10)) // 55
print(memoizedFibonacci(10)) // 55 (cached result)
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return {
if let result = cache[$0] {
return result
}
let result = function($0)
cache[$0] = result
return result
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return {
if let result = cache[$0] {
return result
}
let result = function($0)
cache[$0] = result
return result
}
}
// Example usage:
let fibonacci = memoize { n in
if n <= 1 {
return n
}
return fibonacci(n - 1) + fibonacci(n - 2)
}
// Fibonacci numbers are now cached, so this should be much faster
print(fibonacci(40)) // Prints: 102334155
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
// Example usage
let fibonacci: (Int) -> Int = {
func fibonacciHelper(n: Int) -> Int {
if n <= 1 {
return n
} else {
return fibonacciHelper(n: n - 1) + fibonacciHelper(n: n - 2)
}
}
return fibonacciHelper
}
let memoizedFibonacci = memoize(fibonacci)
print(memoizedFibonacci(10)) // 55
print(memoizedFibonacci(10)) // 55 (cached result)
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
// Example usage:
let factorial = memoize { n in
if n == 0 {
return 1
} else {
return n * factorial(n - 1)
}
}
print(factorial(5)) // Output: 120
print(factorial(5)) // Output: 120 (cached result)
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
// Example usage:
let factorial = memoize { n in
if n <= 1 {
return 1
} else {
return n * factorial(n - 1)
}
}
print(factorial(5)) // Output: 120
print(factorial(5)) // Output: 120 (cached result)
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let cached = cache[input] {
return cached
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
func expensiveComputation(_ input: Int) -> Int {
// Simulate a costly computation
return input * 2
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let cached = cache[input] {
return cached
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
// Example usage
func expensiveComputation(_ input: Int) -> Int {
// Simulate a costly computation
return input * 2
}
let memoizedExpensiveComputation = memoize(expensiveComputation)
print(memoizedExpensiveComputation(5)) // 10
print(memoizedExpensiveComputation(5)) // 10 (cached result)
print(memoizedExpensiveComputation(10)) // 20
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return {
if let result = cache[$0] {
return result
}
let result = function($0)
cache[$0] = result
return result
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return {
if let result = cache[$0] {
return result
}
let result = function($0)
cache[$0] = result
return result
}
}
// Example usage:
let fibonacci = memoize { (n: Int) -> Int in
if n <= 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Compute the first 10 Fibonacci numbers
for i in 0..<10 {
print(fibonacci(i))
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let cached = cache[input] {
return cached
} else {
let result = function(input)
cache[input] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let cached = cache[input] {
return cached
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
// Example usage:
let factorial = memoize { (n: Int) -> Int in
if n == 0 {
return 1
} else {
return n * factorial(n - 1)
}
}
// Calling factorial multiple times with the same input will use the cached result.
print(factorial(5)) // 120
print(factorial(5)) // 120 (cached result)
print(factorial(10)) // 3628800
print(factorial(10)) // 3628800 (cached result)
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cached = cache[input] {
return cached
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
func expensiveComputation(_ input: Int) -> Int {
// Simulate a slow computation
Thread.sleep(forTimeInterval: 1)
return input * 2
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cached = cache[input] {
return cached
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
// Example usage:
func expensiveComputation(_ input: Int) -> Int {
// Simulate a slow computation
Thread.sleep(forTimeInterval: 1)
return input * 2
}
let memoizedComputation = memoize(expensiveComputation)
let result1 = memoizedComputation(5)
let result2 = memoizedComputation(5)
let result3 = memoizedComputation(10)
print(result1) // 10 (cached result)
print(result2) // 10 (cached result)
print(result3) // 20 (new result)
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempt = 0
while true {
do {
return try task()
} catch {
if attempt == attempts {
throw error
}
attempt += 1
}
}
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempt = 0
while true {
do {
return try task()
} catch {
if attempt == attempts {
throw error
}
attempt += 1
}
}
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsLeft = attempts
var lastError: Error?
while attemptsLeft > 0 {
do {
return try task()
} catch {
lastError = error
attemptsLeft -= 1
}
}
throw lastError!
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsLeft = attempts
var lastError: Error?
while attemptsLeft > 0 {
do {
return try task()
} catch {
lastError = error
attemptsLeft -= 1
}
}
throw lastError!
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempt = 0
var result: T?
var error: Error?
while attempt < attempts {
do {
result = try task()
break
} catch {
error = error
attempt += 1
}
}
if let error = error {
throw error
}
return result!
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempt = 0
var result: T?
var error: Error?
while attempt < attempts {
do {
result = try task()
break
} catch {
error = error
attempt += 1
}
}
if let error = error {
throw error
}
return result!
}
// Example usage:
do {
let result = try retry(attempts: 3) {
// Task that may fail
throw NSError(domain: "ExampleDomain", code: 1, userInfo: nil)
}
print(result)
} catch {
print(error)
}
```error = error // cannot assign to value: 'error' is immutablefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempt = 0
while attempt < attempts {
do {
return try task()
} catch {
attempt += 1
if attempt == attempts {
throw error
}
}
}
fatalError("Should not be here")
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempt = 0
while attempt < attempts {
do {
return try task()
} catch {
attempt += 1
if attempt == attempts {
throw error
}
}
}
fatalError("Should not be here")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsLeft = attempts
var error: Error?
while attemptsLeft > 0 {
do {
return try task()
} catch {
error = error
attemptsLeft -= 1
}
}
throw error!
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsLeft = attempts
var error: Error?
while attemptsLeft > 0 {
do {
return try task()
} catch {
error = error
attemptsLeft -= 1
}
}
throw error!
}
// Example usage:
try retry(attempts: 3) {
// Code that may fail
throw NSError(domain: "com.example", code: 1, userInfo: nil)
}
```error = error // cannot assign to value: 'error' is immutablefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if attempts == 0 {
throw error
}
attempts -= 1
}
}
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if attempts == 0 {
throw error
}
attempts -= 1
}
}
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsLeft = attempts
while true {
do {
return try task()
} catch {
if attemptsLeft == 0 {
throw error
}
attemptsLeft -= 1
}
}
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsLeft = attempts
while true {
do {
return try task()
} catch {
if attemptsLeft == 0 {
throw error
}
attemptsLeft -= 1
}
}
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempt = 0
var error: Error?
repeat {
do {
return try task()
} catch {
error = error
attempt += 1
}
} while attempt < attempts
throw error!
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempt = 0
var error: Error?
repeat {
do {
return try task()
} catch {
error = error
attempt += 1
}
} while attempt < attempts
throw error!
}
```error = error // cannot assign to value: 'error' is immutablefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsRemaining = attempts
var error: Error?
var result: T?
repeat {
do {
result = try task()
break
} catch {
attemptsRemaining -= 1
error = error
}
} while attemptsRemaining > 0
if let error = error {
throw error
}
return result!
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsRemaining = attempts
var error: Error?
var result: T?
repeat {
do {
result = try task()
break
} catch {
attemptsRemaining -= 1
error = error
}
} while attemptsRemaining > 0
if let error = error {
throw error
}
return result!
}
```error = error // cannot assign to value: 'error' is immutablefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsLeft = attempts
repeat {
do {
return try task()
} catch {
if attemptsLeft == 1 {
throw error
}
attemptsLeft -= 1
}
} while true
}
func taskThatThrows() throws {
throw NSError(domain: "Error domain", code: 1, userInfo: nil)
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsLeft = attempts
repeat {
do {
return try task()
} catch {
if attemptsLeft == 1 {
throw error
}
attemptsLeft -= 1
}
} while true
}
// Task that throws an error.
func taskThatThrows() throws {
throw NSError(domain: "Error domain", code: 1, userInfo: nil)
}
// Retry the task 3 times.
do {
let result = try retry(attempts: 3, task: taskThatThrows)
print("Result: \(result)")
} catch {
print("Error: \(error)")
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? T
}
}
class ClassThatDependsOnDependency {
private let dependency: Dependency
init(dependency: Dependency) {
self.dependency = dependency
}
}
class Dependency {
let value: String
init(value: String) {
self.value = value
}
}
class ClassThatUsesDIContainer {
private let container: DIContainerProtocol
init(container: DIContainerProtocol) {
self.container = container
}
func resolveDependency() -> Dependency? {
return container.resolve(Dependency.self)
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? T
}
}
// A class that depends on a dependency.
class ClassThatDependsOnDependency {
private let dependency: Dependency
init(dependency: Dependency) {
self.dependency = dependency
}
}
// A dependency.
class Dependency {
let value: String
init(value: String) {
self.value = value
}
}
// A class that uses the DI container.
class ClassThatUsesDIContainer {
private let container: DIContainerProtocol
init(container: DIContainerProtocol) {
self.container = container
}
func resolveDependency() -> Dependency? {
return container.resolve(Dependency.self)
}
}
// An example of how to use the DI container.
let container = DIContainer()
container.register(Dependency.self) {
return Dependency(value: "Hello, world!")
}
let classThatUsesDIContainer = ClassThatUsesDIContainer(container: container)
if let dependency = classThatUsesDIContainer.resolveDependency() {
print(dependency.value)
}
```factories[type] = factory // argument type 'T.Type' does not conform to expected type 'Hashable'return factories[type] as? T // no exact matches in call to subscriptprotocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else {
return nil
}
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else {
return nil
}
return factory() as? T
}
}
// MARK: - Example usage
// Register a service implementation.
let container = DIContainer()
container.register(MyService.self) {
return MyService()
}
// Resolve the service from the container.
let service = container.resolve(MyService.self)
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: () -> Any] = [:]
// Register a factory for a given type.
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(reflecting: type)] = factory
}
// Resolve an instance of a given type.
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(reflecting: type)] else {
return nil
}
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: () -> Any] = [:]
// Register a factory for a given type.
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(reflecting: type)] = factory
}
// Resolve an instance of a given type.
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(reflecting: type)] else {
return nil
}
return factory() as? T
}
}
// Example usage:
let container = DIContainer()
container.register(MyService.self) {
return MyService()
}
// Resolve an instance of MyService
if let service = container.resolve(MyService.self) {
print("Resolved service: \(service)")
} else {
print("Failed to resolve service")
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(reflecting: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(reflecting: type)] else {
return nil
}
return factory() as? T
}
}
class Service {
private let dependency: Dependency
init(dependency: Dependency) {
self.dependency = dependency
}
func doSomething() {
dependency.doSomething()
}
}
class Dependency {
func doSomething() {
print("Dependency: Doing something")
}
}
class ViewController {
private let service: Service
init(service: Service) {
self.service = service
}
func viewDidLoad() {
service.doSomething()
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(reflecting: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(reflecting: type)] else {
return nil
}
return factory() as? T
}
}
// A simple service that requires a dependency to be resolved.
class Service {
private let dependency: Dependency
init(dependency: Dependency) {
self.dependency = dependency
}
func doSomething() {
dependency.doSomething()
}
}
// A simple dependency that can be resolved.
class Dependency {
func doSomething() {
print("Dependency: Doing something")
}
}
// A simple view controller that requires a service to be resolved.
class ViewController {
private let service: Service
init(service: Service) {
self.service = service
}
func viewDidLoad() {
service.doSomething()
}
}
// Create a DI container.
let container = DIContainer()
// Register the dependency.
container.register(Dependency.self) {
return Dependency()
}
// Register the service.
container.register(Service.self) {
return Service(dependency: container.resolve(Dependency.self)!)
}
// Register the view controller.
container.register(ViewController.self) {
return ViewController(service: container.resolve(Service.self)!)
}
// Resolve the view controller.
let viewController = container.resolve(ViewController.self)!
// Call the view controller's viewDidLoad method.
viewController.viewDidLoad()
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
if let factory = factories[type] as? () -> T {
return factory()
}
return nil
}
}
protocol ServiceProtocol {
func doSomething()
}
class Service: ServiceProtocol {
func doSomething() {
print("Doing something")
}
}
protocol ViewControllerProtocol {
func doSomething()
}
class ViewController: ViewControllerProtocol {
let service: ServiceProtocol
init(service: ServiceProtocol) {
self.service = service
}
func doSomething() {
service.doSomething()
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
if let factory = factories[type] as? () -> T {
return factory()
}
return nil
}
}
protocol ServiceProtocol {
func doSomething()
}
class Service: ServiceProtocol {
func doSomething() {
print("Doing something")
}
}
protocol ViewControllerProtocol {
func doSomething()
}
class ViewController: ViewControllerProtocol {
let service: ServiceProtocol
init(service: ServiceProtocol) {
self.service = service
}
func doSomething() {
service.doSomething()
}
}
let container = DIContainer()
container.register(ServiceProtocol.self, factory: {
return Service()
})
let viewController = ViewController(service: container.resolve(ServiceProtocol.self)!)
viewController.doSomething()
```factories[type] = factory // argument type 'T.Type' does not conform to expected type 'Hashable'if let factory = factories[type] as? () -> T { // cast from '(key: AnyHashable, value: Any)' to unrelated type '() -> T' always failsif let factory = factories[type] as? () -> T { // cannot convert value of type 'T.Type' to expected argument type 'Dictionary<AnyHashable, Any>.Index'protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
if let factory = factories[type] as? () -> T {
return factory()
}
return nil
}
}
class ViewController {
let presenter: PresenterProtocol
init(presenter: PresenterProtocol) {
self.presenter = presenter
}
}
class Presenter: PresenterProtocol {
let service: ServiceProtocol
init(service: ServiceProtocol) {
self.service = service
}
}
protocol PresenterProtocol {
var service: ServiceProtocol { get }
}
protocol ServiceProtocol {
func doSomething()
}
class Service: ServiceProtocol {
func doSomething() {
print("Doing something!")
}
}
func run() {
let container = DIContainer()
container.register(Service.self) {
return Service()
}
container.register(Presenter.self) {
return Presenter(service: container.resolve(Service.self)!)
}
container.register(ViewController.self) {
return ViewController(presenter: container.resolve(Presenter.self)!)
}
let vc = container.resolve(ViewController.self)
vc?.presenter.service.doSomething()
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
if let factory = factories[type] as? () -> T {
return factory()
}
return nil
}
}
class ViewController {
let presenter: PresenterProtocol
init(presenter: PresenterProtocol) {
self.presenter = presenter
}
}
class Presenter: PresenterProtocol {
let service: ServiceProtocol
init(service: ServiceProtocol) {
self.service = service
}
}
protocol PresenterProtocol {
var service: ServiceProtocol { get }
}
protocol ServiceProtocol {
func doSomething()
}
class Service: ServiceProtocol {
func doSomething() {
print("Doing something!")
}
}
func run() {
let container = DIContainer()
container.register(Service.self) {
return Service()
}
container.register(Presenter.self) {
return Presenter(service: container.resolve(Service.self)!)
}
container.register(ViewController.self) {
return ViewController(presenter: container.resolve(Presenter.self)!)
}
let vc = container.resolve(ViewController.self)
vc?.presenter.service.doSomething()
}
run()
```factories[type] = factory // argument type 'T.Type' does not conform to expected type 'Hashable'if let factory = factories[type] as? () -> T { // cast from '(key: AnyHashable, value: Any)' to unrelated type '() -> T' always failsif let factory = factories[type] as? () -> T { // cannot convert value of type 'T.Type' to expected argument type 'Dictionary<AnyHashable, Any>.Index'protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}
class MyClass {
let dependency: Dependency
init(dependency: Dependency) {
self.dependency = dependency
}
}
protocol Dependency {}
// A simple class that conforms to the Dependency protocol.
class ConcreteDependency: Dependency {}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
class MyClassWithDI2 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
class MyClassWithDI3 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
class MyClassWithDI4 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
class MyClassWithDI5 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
class MyClassWithDI6 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
class MyClassWithDI7 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
class MyClassWithDI8 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
class MyClassWithDI9 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
class MyClassWithDI10 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
class MyClassWithDI11 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
class MyClassWithDI12 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
class MyClassWithDI13 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
class MyClassWithDI14 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClass {
let dependency: Dependency
init(dependency: Dependency) {
self.dependency = dependency
}
}
// A simple protocol that represents a dependency.
protocol Dependency {}
// A simple class that conforms to the Dependency protocol.
class ConcreteDependency: Dependency {}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI2 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI3 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI4 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI5 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI6 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI7 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI8 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI9 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI10 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI11 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI12 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI13 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DI container to resolve a dependency.
class MyClassWithDI14 {
let dependency: Dependency
init(diContainer: DIContainerProtocol) {
dependency = diContainer.resolve(Dependency.self)!
}
}
// A simple class that uses the DIprotocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(reflecting: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(reflecting: type)
guard let factory = factories[key] else {
return nil
}
return factory() as? T
}
}
protocol UserProtocol {
var name: String { get }
}
class User: UserProtocol {
var name: String
init(name: String) {
self.name = name
}
}
protocol UserServiceProtocol {
var user: UserProtocol { get }
}
class UserService: UserServiceProtocol {
var user: UserProtocol
init(user: UserProtocol) {
self.user = user
}
}
protocol UserViewProtocol {
var userService: UserServiceProtocol { get }
}
class UserView: UserViewProtocol {
var userService: UserServiceProtocol
init(userService: UserServiceProtocol) {
self.userService = userService
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(reflecting: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(reflecting: type)
guard let factory = factories[key] else {
return nil
}
return factory() as? T
}
}
protocol UserProtocol {
var name: String { get }
}
class User: UserProtocol {
var name: String
init(name: String) {
self.name = name
}
}
protocol UserServiceProtocol {
var user: UserProtocol { get }
}
class UserService: UserServiceProtocol {
var user: UserProtocol
init(user: UserProtocol) {
self.user = user
}
}
protocol UserViewProtocol {
var userService: UserServiceProtocol { get }
}
class UserView: UserViewProtocol {
var userService: UserServiceProtocol
init(userService: UserServiceProtocol) {
self.userService = userService
}
}
// Register the dependencies
let container = DIContainer()
container.register(User.self, factory: { User(name: "John Doe") })
container.register(UserService.self, factory: { UserService(user: container.resolve(User.self)!) })
container.register(UserView.self, factory: { UserView(userService: container.resolve(UserService.self)!) })
// Resolve the dependencies
let userView = container.resolve(UserView.self)!
print(userView.userService.user.name) // Output: John Doe
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: () -> Any] = [:]
// Register a factory for a given type.
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type.self] = factory
}
// Resolve an instance of a type.
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[type.self] as? () -> T else {
return nil
}
return factory()
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: () -> Any] = [:]
// Register a factory for a given type.
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type.self] = factory
}
// Resolve an instance of a type.
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[type.self] as? () -> T else {
return nil
}
return factory()
}
}
// Example usage:
let container = DIContainer()
// Register a factory for a service.
container.register(Service.self) {
return Service()
}
// Resolve an instance of the service.
if let service = container.resolve(Service.self) {
service.doSomething()
}
```factories[type.self] = factory // argument type 'T.Type' does not conform to expected type 'Hashable'guard let factory = factories[type.self] as? () -> T else { // cannot convert value of type 'T.Type' to expected argument type 'Dictionary<AnyHashable, () -> Any>.Index'guard let factory = factories[type.self] as? () -> T else { // cast from '(key: AnyHashable, value: () -> Any)' to unrelated type '() -> T' always failsprotocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(reflecting: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(reflecting: type)
guard let factory = factories[key] as? () -> T else {
return nil
}
return factory()
}
}
protocol SomeServiceProtocol {
var someProperty: String { get }
}
class SomeService: SomeServiceProtocol {
let someProperty: String
init() {
someProperty = "Some value"
}
}
protocol SomeOtherServiceProtocol {
var someService: SomeServiceProtocol { get }
}
class SomeOtherService: SomeOtherServiceProtocol {
let someService: SomeServiceProtocol
init(someService: SomeServiceProtocol) {
self.someService = someService
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(reflecting: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(reflecting: type)
guard let factory = factories[key] as? () -> T else {
return nil
}
return factory()
}
}
protocol SomeServiceProtocol {
var someProperty: String { get }
}
class SomeService: SomeServiceProtocol {
let someProperty: String
init() {
someProperty = "Some value"
}
}
protocol SomeOtherServiceProtocol {
var someService: SomeServiceProtocol { get }
}
class SomeOtherService: SomeOtherServiceProtocol {
let someService: SomeServiceProtocol
init(someService: SomeServiceProtocol) {
self.someService = someService
}
}
// Register dependencies with the DI container.
let container = DIContainer()
container.register(SomeService.self, factory: { SomeService() })
container.register(SomeOtherService.self, factory: { SomeOtherService(someService: container.resolve(SomeService.self)!) })
// Resolve dependencies from the DI container.
let someOtherService = container.resolve(SomeOtherService.self)!
print(someOtherService.someService.someProperty) // "Some value"
``` // XCTAssertEqual failed: (nil) is not equal to (Optional("Hello, World!"))protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
// MARK: - Properties
private(set) var state: State
private var transitions: [State: [Event: State]] = [:]
// MARK: - Init
required init(state: State) {
self.state = state
}
// MARK: - Methods
func trigger(event: Event) {
guard let nextState = transitions[state][event] else { return }
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from] = [event: to]
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
// MARK: - Properties
private(set) var state: State
private var transitions: [State: [Event: State]] = [:]
// MARK: - Init
required init(state: State) {
self.state = state
}
// MARK: - Methods
func trigger(event: Event) {
guard let nextState = transitions[state][event] else { return }
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from] = [event: to]
}
}
```guard let nextState = transitions[state][event] else { return } // value of optional type '[Event : State]?' must be unwrapped to refer to member 'subscript' of wrapped base type '[Event : State]'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
// Current state of the state machine.
var state: State {
didSet {
print("State changed from \(oldValue) to \(state)")
}
}
// Dictionary of transitions between states.
private var transitions: [State: [Event: State]]
// Initializer.
init(state: State) {
self.state = state
self.transitions = [:]
}
// Trigger an event.
func trigger(event: Event) {
if let nextState = transitions[state][event] {
state = nextState
} else {
print("No transition found for event \(event) in state \(state)")
}
}
// Register a transition between two states.
func registerTransition(from: State, to: State, event: Event) {
transitions[from] = [event: to]
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
// Current state of the state machine.
var state: State {
didSet {
print("State changed from \(oldValue) to \(state)")
}
}
// Dictionary of transitions between states.
private var transitions: [State: [Event: State]]
// Initializer.
init(state: State) {
self.state = state
self.transitions = [:]
}
// Trigger an event.
func trigger(event: Event) {
if let nextState = transitions[state][event] {
state = nextState
} else {
print("No transition found for event \(event) in state \(state)")
}
}
// Register a transition between two states.
func registerTransition(from: State, to: State, event: Event) {
transitions[from] = [event: to]
}
}
```init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'if let nextState = transitions[state][event] { // value of optional type '[Event : State]?' must be unwrapped to refer to member 'subscript' of wrapped base type '[Event : State]'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
typealias Transition = (Event) -> State
private var state: State
private var transitions: [State: Transition]
required init(state: State) {
self.state = state
self.transitions = [:]
}
func trigger(event: Event) {
if let transition = transitions[state] {
state = transition(event)
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from] = { _ in to }
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
typealias Transition = (Event) -> State
private var state: State
private var transitions: [State: Transition]
required init(state: State) {
self.state = state
self.transitions = [:]
}
func trigger(event: Event) {
if let transition = transitions[state] {
state = transition(event)
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from] = { _ in to }
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
// The current state.
private(set) var state: State
// All possible states.
private let states: Set<State>
// All possible events.
private let events: Set<Event>
// All registered transitions.
private var transitions: [State: [Event: State]]
init(state: State) {
self.state = state
self.states = Set<State>()
self.events = Set<Event>()
self.transitions = [:]
}
// Trigger an event and change the state if a transition is registered for the current state and event.
func trigger(event: Event) {
if let state = transitions[self.state]?[event] {
self.state = state
}
}
// Register a transition between two states for a given event.
func registerTransition(from: State, to: State, event: Event) {
self.states.insert(from)
self.states.insert(to)
self.events.insert(event)
self.transitions[from] = [event: to]
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
// The current state.
private(set) var state: State
// All possible states.
private let states: Set<State>
// All possible events.
private let events: Set<Event>
// All registered transitions.
private var transitions: [State: [Event: State]]
init(state: State) {
self.state = state
self.states = Set<State>()
self.events = Set<Event>()
self.transitions = [:]
}
// Trigger an event and change the state if a transition is registered for the current state and event.
func trigger(event: Event) {
if let state = transitions[self.state]?[event] {
self.state = state
}
}
// Register a transition between two states for a given event.
func registerTransition(from: State, to: State, event: Event) {
self.states.insert(from)
self.states.insert(to)
self.events.insert(event)
self.transitions[from] = [event: to]
}
}
```init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'self.states.insert(from) // cannot use mutating member on immutable value: 'states' is a 'let' constantself.states.insert(to) // cannot use mutating member on immutable value: 'states' is a 'let' constantself.events.insert(event) // cannot use mutating member on immutable value: 'events' is a 'let' constantprotocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var transitions: [State: [Event: State]]
private(set) var state: State
init(state: State) {
self.transitions = [:]
self.state = state
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from] = [event: to]
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else { return }
state = nextState
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var transitions: [State: [Event: State]]
private(set) var state: State
init(state: State) {
self.transitions = [:]
self.state = state
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from] = [event: to]
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else { return }
state = nextState
}
}
```init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
typealias Transition = (Event) -> State?
private var transitions: [State: Transition] = [:]
private(set) var state: State
init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state](event) else { return }
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from] = { event in
if event == event { return to }
return nil
}
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
typealias Transition = (Event) -> State?
private var transitions: [State: Transition] = [:]
private(set) var state: State
init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state](event) else { return }
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from] = { event in
if event == event { return to }
return nil
}
}
}
```init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'guard let nextState = transitions[state](event) else { return } // value of optional type '((Event) -> State?)?' must be unwrapped to a value of type '(Event) -> State?'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var stateTransitions = [State: [Event: State]]()
var state: State
init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = stateTransitions[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
stateTransitions[from] = [event: to]
}
}
enum State: String, Hashable {
case idle
case running
case paused
}
enum Event: Hashable {
case start
case pause
case resume
case stop
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var stateTransitions = [State: [Event: State]]()
var state: State
init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = stateTransitions[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
stateTransitions[from] = [event: to]
}
}
enum State: String, Hashable {
case idle
case running
case paused
}
enum Event: Hashable {
case start
case pause
case resume
case stop
}
let stateMachine = StateMachine<State, Event>(state: .idle)
stateMachine.registerTransition(from: .idle, to: .running, event: .start)
stateMachine.registerTransition(from: .running, to: .paused, event: .pause)
stateMachine.registerTransition(from: .paused, to: .running, event: .resume)
stateMachine.registerTransition(from: .running, to: .idle, event: .stop)
stateMachine.trigger(event: .start)
print(stateMachine.state) // .running
stateMachine.trigger(event: .pause)
print(stateMachine.state) // .paused
stateMachine.trigger(event: .resume)
print(stateMachine.state) // .running
stateMachine.trigger(event: .stop)
print(stateMachine.state) // .idle
```init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private(set) var state: State
private var transitions: [Transition<State, Event>] = []
init(state: State) {
self.state = state
}
func trigger(event: Event) {
for transition in transitions where transition.from == state && transition.event == event {
state = transition.to
return
}
assertionFailure("No transition registered for \(state) -> \(event)")
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
struct Transition<State: Hashable, Event: Hashable> {
let from: State
let to: State
let event: Event
}
enum State {
case idle, loading, success, failure
}
enum Event {
case start, stop, success, failure
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private(set) var state: State
private var transitions: [Transition<State, Event>] = []
init(state: State) {
self.state = state
}
func trigger(event: Event) {
for transition in transitions where transition.from == state && transition.event == event {
state = transition.to
return
}
assertionFailure("No transition registered for \(state) -> \(event)")
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
struct Transition<State: Hashable, Event: Hashable> {
let from: State
let to: State
let event: Event
}
enum State {
case idle, loading, success, failure
}
enum Event {
case start, stop, success, failure
}
let stateMachine = StateMachine<State, Event>(state: .idle)
stateMachine.registerTransition(from: .idle, to: .loading, event: .start)
stateMachine.registerTransition(from: .loading, to: .success, event: .success)
stateMachine.registerTransition(from: .loading, to: .failure, event: .failure)
stateMachine.registerTransition(from: .success, to: .idle, event: .stop)
stateMachine.registerTransition(from: .failure, to: .idle, event: .stop)
stateMachine.trigger(event: .start)
print(stateMachine.state) // loading
stateMachine.trigger(event: .failure)
print(stateMachine.state) // failure
stateMachine.trigger(event: .stop)
print(stateMachine.state) // idle
```init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var stateTransitions: [State: [Event: State]] = [:]
var state: State
init(state: State) {
self.state = state
}
func registerTransition(from: State, to: State, event: Event) {
stateTransitions[from] = [event: to]
}
func trigger(event: Event) {
guard let transition = stateTransitions[state]?[event] else {
print("No transition registered for \(state) with event \(event).")
return
}
state = transition
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var stateTransitions: [State: [Event: State]] = [:]
var state: State
init(state: State) {
self.state = state
}
func registerTransition(from: State, to: State, event: Event) {
stateTransitions[from] = [event: to]
}
func trigger(event: Event) {
guard let transition = stateTransitions[state]?[event] else {
print("No transition registered for \(state) with event \(event).")
return
}
state = transition
}
}
```init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
// MARK: - Properties
// MARK: - Public
// MARK: - Private
private var state: State
private var transitions: [State: [Event: State]]
// MARK: - Lifecycle
required init(state: State) {
self.state = state
self.transitions = [:]
}
// MARK: - Public
// MARK: - Private
private func transition(to state: State) {
self.state = state
}
// MARK: - StateMachineProtocol
}
extension StateMachine {
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else { return }
transition(to: nextState)
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
enum MachineState: Hashable {
case one
case two
case three
}
enum MachineEvent: Hashable {
case one
case two
case three
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
// MARK: - Properties
// MARK: - Public
// MARK: - Private
private var state: State
private var transitions: [State: [Event: State]]
// MARK: - Lifecycle
required init(state: State) {
self.state = state
self.transitions = [:]
}
// MARK: - Public
// MARK: - Private
private func transition(to state: State) {
self.state = state
}
// MARK: - StateMachineProtocol
}
extension StateMachine {
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else { return }
transition(to: nextState)
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
enum MachineState: Hashable {
case one
case two
case three
}
enum MachineEvent: Hashable {
case one
case two
case three
}
let machine = StateMachine<MachineState, MachineEvent>(state: .one)
machine.registerTransition(from: .one, to: .two, event: .one)
machine.registerTransition(from: .two, to: .three, event: .two)
machine.registerTransition(from: .three, to: .one, event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event: .two)
machine.trigger(event: .three)
machine.trigger(event: .one)
machine.trigger(event:private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.map(\.totalSize).reduce(0, +)
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case let .directory(_, contents):
return contents.map(\.filesCount).reduce(0, +)
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case let .directory(_, contents):
return 1 + contents.map(\.treeDepth).reduce(0, max)
}
}
}
extension FileSystemNode {
func print(depth: Int = 0) {
let indent = String(repeating: " ", count: depth * 2)
switch self {
case let .file(name, _):
print(indent + name)
case let .directory(name, contents):
print(indent + name)
contents.forEach { $0.print(depth: depth + 1) }
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.map(\.totalSize).reduce(0, +)
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case let .directory(_, contents):
return contents.map(\.filesCount).reduce(0, +)
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case let .directory(_, contents):
return 1 + contents.map(\.treeDepth).reduce(0, max)
}
}
}
// Print file system tree.
extension FileSystemNode {
func print(depth: Int = 0) {
let indent = String(repeating: " ", count: depth * 2)
switch self {
case let .file(name, _):
print(indent + name)
case let .directory(name, contents):
print(indent + name)
contents.forEach { $0.print(depth: depth + 1) }
}
}
}
// File system tree example.
let fileSystemTree: FileSystemNode = .directory(name: "root", contents: [
.file(name: "file1", size: 100),
.file(name: "file2", size: 200),
.directory(name: "subdir", contents: [
.file(name: "file3", size: 300),
.directory(name: "subsubdir", contents: [
.file(name: "file4", size: 400),
.file(name: "file5", size: 500)
])
])
])
// Print file system tree.
print("File system tree:")
fileSystemTree.print()
// Print file system metadata.
print("Total size: \(fileSystemTree.totalSize)")
print("Files count: \(fileSystemTree.filesCount)")
print("Tree depth: \(fileSystemTree.treeDepth)")
```print(indent + name) // use of 'print' refers to instance method rather than global function 'print(_:separator:terminator:)' in module 'Swift'print(indent + name) // use of 'print' refers to instance method rather than global function 'print(_:separator:terminator:)' in module 'Swift'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(size: let size, _):
return size
case .directory(contents: let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(contents: let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 0
case .directory(contents: let contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
extension FileSystemNode: CustomStringConvertible {
var description: String {
switch self {
case .file(name: let name, size: let size):
return "file: \(name) - \(size)"
case .directory(name: let name, contents: let contents):
return "directory: \(name) - \(contents)"
}
}
}
extension FileSystemInfo {
var description: String {
return "totalSize: \(totalSize), filesCount: \(filesCount), treeDepth: \(treeDepth)"
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(size: let size, _):
return size
case .directory(contents: let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(contents: let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 0
case .directory(contents: let contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
// Extension for file system node that can be printed to console.
extension FileSystemNode: CustomStringConvertible {
var description: String {
switch self {
case .file(name: let name, size: let size):
return "file: \(name) - \(size)"
case .directory(name: let name, contents: let contents):
return "directory: \(name) - \(contents)"
}
}
}
// Extension for file system node that can be printed to console.
extension FileSystemInfo {
var description: String {
return "totalSize: \(totalSize), filesCount: \(filesCount), treeDepth: \(treeDepth)"
}
}
let fileSystem = FileSystemNode.directory(
name: "root",
contents: [
FileSystemNode.file(name: "a", size: 1),
FileSystemNode.file(name: "b", size: 2),
FileSystemNode.file(name: "c", size: 3),
FileSystemNode.directory(
name: "dir1",
contents: [
FileSystemNode.file(name: "d", size: 4),
FileSystemNode.file(name: "e", size: 5),
FileSystemNode.file(name: "f", size: 6),
FileSystemNode.directory(
name: "dir2",
contents: [
FileSystemNode.file(name: "g", size: 7),
FileSystemNode.file(name: "h", size: 8),
FileSystemNode.file(name: "i", size: 9),
FileSystemNode.directory(
name: "dir3",
contents: [
FileSystemNode.file(name: "j", size: 10),
FileSystemNode.file(name: "k", size: 11),
FileSystemNode.file(name: "l", size: 12),
FileSystemNode.file(name: "m", size: 13),
]
),
]
),
]
),
]
)
print(fileSystem)
print(fileSystem.description)
```case .file(size: let size, _): // tuple pattern element label 'size' must be 'name'return contents.reduce(0) { $0 + $1.totalSize } // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'return contents.reduce(0) { $0 + $1.filesCount } // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'return 1 + contents.reduce(0) { max($0, $1.treeDepth) } // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(name: _, size: size):
return size
case let .directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case let .directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case let .directory(name: _, contents: contents):
return contents.reduce(1) { max($0, $1.treeDepth + 1) }
}
}
}
struct FileSystemManager: FileSystemInfo {
let fileSystemNode: FileSystemNode
var totalSize: Int {
return fileSystemNode.totalSize
}
var filesCount: Int {
return fileSystemNode.filesCount
}
var treeDepth: Int {
return fileSystemNode.treeDepth
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(name: _, size: size):
return size
case let .directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case let .directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case let .directory(name: _, contents: contents):
return contents.reduce(1) { max($0, $1.treeDepth + 1) }
}
}
}
// File system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
struct FileSystemManager: FileSystemInfo {
let fileSystemNode: FileSystemNode
var totalSize: Int {
return fileSystemNode.totalSize
}
var filesCount: Int {
return fileSystemNode.filesCount
}
var treeDepth: Int {
return fileSystemNode.treeDepth
}
}
let fileSystemNode = FileSystemNode.directory(name: "root", contents: [
FileSystemNode.file(name: "a.txt", size: 100),
FileSystemNode.file(name: "b.txt", size: 200),
FileSystemNode.directory(name: "dir1", contents: [
FileSystemNode.file(name: "c.txt", size: 300),
FileSystemNode.file(name: "d.txt", size: 400),
FileSystemNode.directory(name: "dir2", contents: [
FileSystemNode.file(name: "e.txt", size: 500),
FileSystemNode.file(name: "f.txt", size: 600),
]),
]),
])
let fileSystemManager = FileSystemManager(fileSystemNode: fileSystemNode)
print("Total size: \(fileSystemManager.totalSize)")
print("Files count: \(fileSystemManager.filesCount)")
print("Tree depth: \(fileSystemManager.treeDepth)")
```indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(let name, let size):
return size
case .directory(_, let contents):
return contents.map { $0.totalSize }.reduce(0, +)
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.map { $0.filesCount }.reduce(0, +)
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.map { $0.treeDepth }.reduce(1, max) + 1
}
}
}
struct FileSystemManager {
let root: FileSystemNode
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
func printFileSystem(node: FileSystemNode, indent: Int = 0) {
switch node {
case .file(let name, let size):
print(" ".repeated(times: indent) + "📄 \(name) (\(size) bytes)")
case .directory(let name, let contents):
print(" ".repeated(times: indent) + "📂 \(name)")
for content in contents {
printFileSystem(node: content, indent: indent + 1)
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(let name, let size):
return size
case .directory(_, let contents):
return contents.map { $0.totalSize }.reduce(0, +)
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.map { $0.filesCount }.reduce(0, +)
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.map { $0.treeDepth }.reduce(1, max) + 1
}
}
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
struct FileSystemManager {
let root: FileSystemNode
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
// The file system tree.
let fileSystem = FileSystemManager(root: .directory(
name: "root",
contents: [
.directory(
name: "Applications",
contents: [
.file(name: "Calculator", size: 100),
.file(name: "Calendar", size: 200),
]
),
.directory(
name: "Documents",
contents: [
.file(name: "Resume", size: 50),
.file(name: "CoverLetter", size: 10),
.directory(
name: "Projects",
contents: [
.file(name: "Project1", size: 100),
.file(name: "Project2", size: 200),
]
),
]
),
.directory(
name: "Downloads",
contents: [
.file(name: "File1", size: 100),
.file(name: "File2", size: 200),
.file(name: "File3", size: 300),
]
),
]
))
// Print the file system tree.
func printFileSystem(node: FileSystemNode, indent: Int = 0) {
switch node {
case .file(let name, let size):
print(" ".repeated(times: indent) + "📄 \(name) (\(size) bytes)")
case .directory(let name, let contents):
print(" ".repeated(times: indent) + "📂 \(name)")
for content in contents {
printFileSystem(node: content, indent: indent + 1)
}
}
}
// Print the file system tree.
print("File System Tree:")
printFileSystem(node: fileSystem.root)
// Print the file system metadata.
print("Total size: \(fileSystem.totalSize) bytes")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
```case .file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itprint(" ".repeated(times: indent) + "📄 \(name) (\(size) bytes)") // value of type 'String' has no member 'repeated'print(" ".repeated(times: indent) + "📂 \(name)") // value of type 'String' has no member 'repeated'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(size: let size):
return size
case .directory(contents: let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(contents: let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(contents: let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
extension FileSystemNode {
func print(level: Int = 0) {
switch self {
case .file(name: let name, size: let size):
print("\(name) (\(size))")
case .directory(name: let name, contents: let contents):
print("\(name)")
for content in contents {
content.print(level: level + 1)
}
}
}
}
func printFileSystem(root: FileSystemNode) {
root.print()
}
func totalSize(root: FileSystemNode) -> Int {
return root.totalSize
}
func filesCount(root: FileSystemNode) -> Int {
return root.filesCount
}
func treeDepth(root: FileSystemNode) -> Int {
return root.treeDepth
}
func main() {
let root = FileSystemNode.directory(
name: "/",
contents: [
FileSystemNode.file(name: "file1", size: 10),
FileSystemNode.file(name: "file2", size: 20),
FileSystemNode.directory(
name: "dir1",
contents: [
FileSystemNode.file(name: "file3", size: 30),
FileSystemNode.file(name: "file4", size: 40),
FileSystemNode.directory(
name: "dir2",
contents: [
FileSystemNode.file(name: "file5", size: 50),
FileSystemNode.file(name: "file6", size: 60),
]
)
]
)
]
)
printFileSystem(root: root)
print("Total size:", totalSize(root: root))
print("Files count:", filesCount(root: root))
print("Tree depth:", treeDepth(root: root))
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(size: let size):
return size
case .directory(contents: let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(contents: let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(contents: let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func print(level: Int = 0) {
switch self {
case .file(name: let name, size: let size):
print("\(name) (\(size))")
case .directory(name: let name, contents: let contents):
print("\(name)")
for content in contents {
content.print(level: level + 1)
}
}
}
}
func printFileSystem(root: FileSystemNode) {
root.print()
}
func totalSize(root: FileSystemNode) -> Int {
return root.totalSize
}
func filesCount(root: FileSystemNode) -> Int {
return root.filesCount
}
func treeDepth(root: FileSystemNode) -> Int {
return root.treeDepth
}
func main() {
let root = FileSystemNode.directory(
name: "/",
contents: [
FileSystemNode.file(name: "file1", size: 10),
FileSystemNode.file(name: "file2", size: 20),
FileSystemNode.directory(
name: "dir1",
contents: [
FileSystemNode.file(name: "file3", size: 30),
FileSystemNode.file(name: "file4", size: 40),
FileSystemNode.directory(
name: "dir2",
contents: [
FileSystemNode.file(name: "file5", size: 50),
FileSystemNode.file(name: "file6", size: 60),
]
)
]
)
]
)
printFileSystem(root: root)
print("Total size:", totalSize(root: root))
print("Files count:", filesCount(root: root))
print("Tree depth:", treeDepth(root: root))
}
main()
```return size // cannot convert return expression of type '(name: String, size: Int)' to return type 'Int'return contents.reduce(0) { $0 + $1.totalSize } // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'return contents.reduce(0) { $0 + $1.filesCount } // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'return contents.reduce(0) { max($0, $1.treeDepth) } + 1 // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'print("\(name) (\(size))") // use of 'print' refers to instance method rather than global function 'print(_:separator:terminator:)' in module 'Swift'print("\(name)") // use of 'print' refers to instance method rather than global function 'print(_:separator:terminator:)' in module 'Swift'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(name: _, size: let size):
return size
case .directory(name: _, contents: let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(name: _, size: _):
return 1
case .directory(name: _, contents: let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(name: _, size: _):
return 1
case .directory(name: _, contents: let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}
protocol FileSystemManager {
func createFileSystem(from nodes: [FileSystemNode]) -> FileSystemNode
}
struct FileSystemManagerImpl: FileSystemManager {
func createFileSystem(from nodes: [FileSystemNode]) -> FileSystemNode {
guard let root = nodes.first else {
fatalError("File system is empty.")
}
return root
}
}
protocol FileSystemNodeFactory {
func createFileSystemNodes(from fileSystem: FileSystemNode) -> [FileSystemNode]
}
struct FileSystemNodeFactoryImpl: FileSystemNodeFactory {
func createFileSystemNodes(from fileSystem: FileSystemNode) -> [FileSystemNode] {
switch fileSystem {
case .file(name: _, size: _):
return [fileSystem]
case .directory(name: _, contents: let contents):
return contents.flatMap { createFileSystemNodes(from: $0) }
}
}
}
protocol FileSystemMetadataCalculator {
func calculateMetadata(from fileSystem: FileSystemNode) -> [FileSystemInfo]
}
struct FileSystemMetadataCalculatorImpl: FileSystemMetadataCalculator {
func calculateMetadata(from fileSystem: FileSystemNode) -> [FileSystemInfo] {
switch fileSystem {
case .file(name: _, size: _):
return [fileSystem]
case .directory(name: _, contents: let contents):
return contents.flatMap { calculateMetadata(from: $0) }
}
}
}
protocol FileSystemMetadataPrinter {
func printMetadata(from fileSystem: FileSystemNode)
}
struct FileSystemMetadataPrinterImpl: FileSystemMetadataPrinter {
func printMetadata(from fileSystem: FileSystemNode) {
switch fileSystem {
case .file(name: let name, size: let size):
print("File: \(name), size: \(size)")
case .directory(name: let name, contents: let contents):
print("Directory: \(name), files count: \(contents.count), total size: \(contents.reduce(0) { $0 + $1.totalSize })")
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(name: _, size: let size):
return size
case .directory(name: _, contents: let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(name: _, size: _):
return 1
case .directory(name: _, contents: let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(name: _, size: _):
return 1
case .directory(name: _, contents: let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}
// Abstract file system manager.
// Used to create file system tree from file system nodes.
protocol FileSystemManager {
func createFileSystem(from nodes: [FileSystemNode]) -> FileSystemNode
}
// Concrete file system manager.
struct FileSystemManagerImpl: FileSystemManager {
func createFileSystem(from nodes: [FileSystemNode]) -> FileSystemNode {
guard let root = nodes.first else {
fatalError("File system is empty.")
}
return root
}
}
// Abstract file system node.
// Used to create file system nodes from file system tree.
protocol FileSystemNodeFactory {
func createFileSystemNodes(from fileSystem: FileSystemNode) -> [FileSystemNode]
}
// Concrete file system node.
struct FileSystemNodeFactoryImpl: FileSystemNodeFactory {
func createFileSystemNodes(from fileSystem: FileSystemNode) -> [FileSystemNode] {
switch fileSystem {
case .file(name: _, size: _):
return [fileSystem]
case .directory(name: _, contents: let contents):
return contents.flatMap { createFileSystemNodes(from: $0) }
}
}
}
// Abstract file system metadata calculator.
// Used to calculate file system metadata from file system tree.
protocol FileSystemMetadataCalculator {
func calculateMetadata(from fileSystem: FileSystemNode) -> [FileSystemInfo]
}
// Concrete file system metadata calculator.
struct FileSystemMetadataCalculatorImpl: FileSystemMetadataCalculator {
func calculateMetadata(from fileSystem: FileSystemNode) -> [FileSystemInfo] {
switch fileSystem {
case .file(name: _, size: _):
return [fileSystem]
case .directory(name: _, contents: let contents):
return contents.flatMap { calculateMetadata(from: $0) }
}
}
}
// Abstract file system metadata printer.
// Used to print file system metadata from file system tree.
protocol FileSystemMetadataPrinter {
func printMetadata(from fileSystem: FileSystemNode)
}
// Concrete file system metadata printer.
struct FileSystemMetadataPrinterImpl: FileSystemMetadataPrinter {
func printMetadata(from fileSystem: FileSystemNode) {
switch fileSystem {
case .file(name: let name, size: let size):
print("File: \(name), size: \(size)")
case .directory(name: let name, contents: let contents):
print("Directory: \(name), files count: \(contents.count), total size: \(contents.reduce(0) { $0 + $1.totalSize })")
}
}
}
// Abstract file system metadata calculator.
// Used to calculate file system metadata from file system tree.
protocol FileSystemMetadataCalculator {
func calculateMetadata(from fileSystem: FileSystemNode) -> [FileSystemInfo]
}
// Concrete file system metadata calculator.
struct FileSystemMetadataCalculatorImpl: FileSystemMetadataCalculator {
func calculateMetadata(from fileSystem: FileSystemNode) -> [FileSystemInfo] {
switch fileSystem {
case .file(name: _, size: _):
return [fileSystem]
case .directory(name: _, contents: let contents):
return contents.flatMap { calculateMetadata(from: $0) }
}
}
}
// Abstract file system metadata printer.
// Used to print file system metadata from file system tree.
protocol FileSystemMetadataPrinter {
func printMetadata(from fileSystem: FileSystemNode)
}
// Concrete file system metadata printer.
struct FileSystemMetadataPrinterImpl: FileSystemMetadataPrinter {
func printMetadata(from fileSystem: FileSystemNode) {
switch fileSystem {return 1 + contents.map { $0.treeDepth }.max() ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(name: _, size: let size):
return size
case .directory(name: _, contents: let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(name: _, size: _):
return 1
case .directory(name: _, contents: let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(name: _, size: _):
return 0
case .directory(name: _, contents: let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
class FileSystemManager {
var root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func totalSize() -> Int {
return root.totalSize
}
func filesCount() -> Int {
return root.filesCount
}
func treeDepth() -> Int {
return root.treeDepth
}
}
class FileMetadataManager: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
class FileMetadataManager2: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
class FileMetadataManager3: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
class FileMetadataManager4: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
class FileMetadataManager5: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
class FileMetadataManager6: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
class FileMetadataManager7: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
class FileMetadataManager8: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(name: _, size: let size):
return size
case .directory(name: _, contents: let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(name: _, size: _):
return 1
case .directory(name: _, contents: let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(name: _, size: _):
return 0
case .directory(name: _, contents: let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
// File system manager with file system tree.
class FileSystemManager {
var root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func totalSize() -> Int {
return root.totalSize
}
func filesCount() -> Int {
return root.filesCount
}
func treeDepth() -> Int {
return root.treeDepth
}
}
// File system manager with file system tree and file system metadata.
class FileMetadataManager: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
// File system manager with file system tree and file system metadata.
class FileMetadataManager2: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
// File system manager with file system tree and file system metadata.
class FileMetadataManager3: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
// File system manager with file system tree and file system metadata.
class FileMetadataManager4: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
// File system manager with file system tree and file system metadata.
class FileMetadataManager5: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
// File system manager with file system tree and file system metadata.
class FileMetadataManager6: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
// File system manager with file system tree and file system metadata.
class FileMetadataManager7: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
// File system manager with file system tree and file system metadata.
class FileMetadataManager8: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
// File system manager with file system tree and file system metadata.
class FileMetadataManager9: FileSystemManager, FileSystemInfo {
var totalSize: Int {
return root.totalSize
// XCTAssertEqual failed: (3) is not equal to (4)indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case let .directory(_, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case let .directory(_, contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
extension FileSystemNode {
var totalSize: Int {
var result = 0
var stack: [FileSystemNode] = [self]
while let node = stack.popLast() {
switch node {
case let .file(_, size):
result += size
case let .directory(_, contents):
stack.append(contents)
}
}
return result
}
var filesCount: Int {
var result = 0
var stack: [FileSystemNode] = [self]
while let node = stack.popLast() {
switch node {
case .file:
result += 1
case let .directory(_, contents):
stack.append(contents)
}
}
return result
}
var treeDepth: Int {
var result = 0
var stack: [FileSystemNode] = [self]
while let node = stack.popLast() {
switch node {
case .file:
result = max(result, 0)
case let .directory(_, contents):
stack.append(contents)
result = max(result, 1)
}
}
return result
}
}
extension FileSystemNode {
var totalSize: Int {
var result = 0
visit { node in
if case let .file(_, size) = node {
result += size
}
}
return result
}
var filesCount: Int {
var result = 0
visit { node in
if case .file = node {
result += 1
}
}
return result
}
var treeDepth: Int {
var result = 0
visit { node in
if case .file = node {
result = max(result, 0)
} else {
result = max(result, 1)
}
}
return result
}
private func visit(_ visitor: (FileSystemNode) -> Void) {
visitor(self)
switch self {
case .file:
break
case let .directory(_, contents):
contents.forEach { $0.visit(visitor) }
}
}
}
extension FileSystemNode {
var totalSize: Int {
return visit { node in
switch node {
case let .file(_, size):
return size
default:
return 0
}
}
}
var filesCount: Int {
return visit { node in
switch node {
case .file:
return 1
default:
return 0
}
}
}
var treeDepth: Int {
return visit { node in
switch node {
case .file:
return 0
default:
return 1
}
}
}
private func visit<T>(_ visitor: (FileSystemNode) -> T) -> T {
return visitor(self)
+ (self is .file ? 0 : contents.reduce(0) { $0 + $1.visit(visitor) })
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case let .directory(_, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case let .directory(_, contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
// Concrete file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
var totalSize: Int {
var result = 0
var stack: [FileSystemNode] = [self]
while let node = stack.popLast() {
switch node {
case let .file(_, size):
result += size
case let .directory(_, contents):
stack.append(contents)
}
}
return result
}
var filesCount: Int {
var result = 0
var stack: [FileSystemNode] = [self]
while let node = stack.popLast() {
switch node {
case .file:
result += 1
case let .directory(_, contents):
stack.append(contents)
}
}
return result
}
var treeDepth: Int {
var result = 0
var stack: [FileSystemNode] = [self]
while let node = stack.popLast() {
switch node {
case .file:
result = max(result, 0)
case let .directory(_, contents):
stack.append(contents)
result = max(result, 1)
}
}
return result
}
}
// Concrete file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
var totalSize: Int {
var result = 0
visit { node in
if case let .file(_, size) = node {
result += size
}
}
return result
}
var filesCount: Int {
var result = 0
visit { node in
if case .file = node {
result += 1
}
}
return result
}
var treeDepth: Int {
var result = 0
visit { node in
if case .file = node {
result = max(result, 0)
} else {
result = max(result, 1)
}
}
return result
}
private func visit(_ visitor: (FileSystemNode) -> Void) {
visitor(self)
switch self {
case .file:
break
case let .directory(_, contents):
contents.forEach { $0.visit(visitor) }
}
}
}
// Concrete file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
var totalSize: Int {
return visit { node in
switch node {
case let .file(_, size):
return size
default:
return 0
}
}
}
var filesCount: Int {
return visit { node in
switch node {
case .file:
return 1
default:
return 0
}
}
}
var treeDepth: Int {
return visit { node in
switch node {
case .file:
return 0
default:
return 1
}
}
}
private func visit<T>(_ visitor: (FileSystemNode) -> T) -> T {
return visitor(self)
+ (self is .file ? 0 : contents.reduce(0) { $0 + $1.visit(visitor) })
}
}extension FileSystemNode: FileSystemInfo { // type 'FileSystemNode' does not conform to protocol 'FileSystemInfo'var totalSize: Int { // invalid redeclaration of 'totalSize'stack.append(contents) // no exact matches in call to instance method 'append'var filesCount: Int { // invalid redeclaration of 'filesCount'stack.append(contents) // no exact matches in call to instance method 'append'var treeDepth: Int { // invalid redeclaration of 'treeDepth'stack.append(contents) // no exact matches in call to instance method 'append'var totalSize: Int { // invalid redeclaration of 'totalSize'var filesCount: Int { // invalid redeclaration of 'filesCount'var treeDepth: Int { // invalid redeclaration of 'treeDepth'var totalSize: Int { // invalid redeclaration of 'totalSize'var filesCount: Int { // invalid redeclaration of 'filesCount'var treeDepth: Int { // invalid redeclaration of 'treeDepth'+ (self is .file ? 0 : contents.reduce(0) { $0 + $1.visit(visitor) }) // expected type after 'is'+ (self is .file ? 0 : contents.reduce(0) { $0 + $1.visit(visitor) }) // binary operator '+' cannot be applied to operands of type 'T' and '()'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(name: _, size: let size):
return size
case .directory(name: _, contents: let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(name: _, size: _):
return 1
case .directory(name: _, contents: let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(name: _, size: _):
return 0
case .directory(name: _, contents: let contents):
return 1 + (contents.isEmpty ? 0 : contents.map { $0.treeDepth }.max()!)
}
}
}
struct FileSystemManager {
let root: FileSystemNode
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(name: _, size: let size):
return size
case .directory(name: _, contents: let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(name: _, size: _):
return 1
case .directory(name: _, contents: let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(name: _, size: _):
return 0
case .directory(name: _, contents: let contents):
return 1 + (contents.isEmpty ? 0 : contents.map { $0.treeDepth }.max()!)
}
}
}
// File system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
struct FileSystemManager {
let root: FileSystemNode
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
// Example file system tree.
let root = FileSystemNode.directory(
name: "",
contents: [
FileSystemNode.directory(
name: "a",
contents: [
FileSystemNode.directory(
name: "aa",
contents: [
FileSystemNode.directory(
name: "aaa",
contents: [
FileSystemNode.file(name: "a.txt", size: 100),
]
),
FileSystemNode.file(name: "b.txt", size: 200),
FileSystemNode.file(name: "c.txt", size: 300),
]
),
FileSystemNode.directory(
name: "ab",
contents: [
FileSystemNode.file(name: "d.txt", size: 400),
FileSystemNode.file(name: "e.txt", size: 500),
]
),
FileSystemNode.directory(
name: "ac",
contents: [
FileSystemNode.file(name: "f.txt", size: 600),
FileSystemNode.file(name: "g.txt", size: 700),
]
),
]
),
FileSystemNode.directory(
name: "b",
contents: [
FileSystemNode.directory(
name: "ba",
contents: [
FileSystemNode.file(name: "h.txt", size: 800),
FileSystemNode.file(name: "i.txt", size: 900),
]
),
FileSystemNode.directory(
name: "bb",
contents: [
FileSystemNode.file(name: "j.txt", size: 1000),
FileSystemNode.file(name: "k.txt", size: 1100),
]
),
FileSystemNode.directory(
name: "bc",
contents: [
FileSystemNode.file(name: "l.txt", size: 1200),
FileSystemNode.file(name: "m.txt", size: 1300),
]
),
]
),
FileSystemNode.directory(
name: "c",
contents: [
FileSystemNode.directory(
name: "ca",
contents: [
FileSystemNode.file(name: "n.txt", size: 1400),
FileSystemNode.file(name: "o.txt", size: 1500),
]
),
FileSystemNode.directory(
name: "cb",
contents: [
FileSystemNode.file(name: "p.txt", size: 1600),
FileSystemNode.file(name: "q.txt", size: 1700),
]
),
FileSystemNode.directory(
name: "cc",
contents: [
// XCTAssertEqual failed: (3) is not equal to (4)indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.map { $0.totalSize }.reduce(0, +)
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case let .directory(_, contents):
return contents.map { $0.filesCount }.reduce(0, +)
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case let .directory(_, contents):
return contents.map { $0.treeDepth }.max() ?? 1
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.map { $0.totalSize }.reduce(0, +)
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case let .directory(_, contents):
return contents.map { $0.filesCount }.reduce(0, +)
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case let .directory(_, contents):
return contents.map { $0.treeDepth }.max() ?? 1
}
}
}
// Concrete file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
final class FileSystemManager: FileSystemInfo {
private let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
``` // XCTAssertEqual failed: (1) is not equal to (4)protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Queue<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.insert(element, at: 0)
}
func pop() -> Element? {
return elements.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic queue with push and pop functions.
class Queue<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.insert(element, at: 0)
}
func pop() -> Element? {
return elements.popLast()
}
}
```class Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class Queue<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Queue<Element>'var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
guard elements.count > 0 else { return nil }
return elements.removeLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
guard elements.count > 0 else { return nil }
return elements.removeLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
guard elements.count > 0 else { return nil }
return elements.removeLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
guard elements.count > 0 else { return nil }
return elements.removeLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
guard elements.count > 0 else { return nil }
return elements.removeLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
guard elements.count > 0 else { return nil }
return elements.removeLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
guard elements.count > 0 else { return nil }
return elements.removeLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
guard elements.count > 0 else { return nil }
return elements.removeLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
guard elements.count > 0 else { return nil }
return elements.removeLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
guard elements.count > 0 else { return nil }
return elements.removeLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
guard elements.count > 0 else { return nil }
return elements.removeLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
guard elements.count > 0 else { return nil }
return elements.removeLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
guard elements.count > 0 else { return nil }
return elements.removeLastclass Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
private var storage: [Element] = []
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
init() {}
}
class Queue<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
class Deque<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
class Deque2<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
class Deque3<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
class Deque4<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
class Deque5<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
class Deque6<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
class Deque7<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
class Deque8<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
class Deque9<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
class Deque10<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var storage: [Element] = []
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
init() {}
}
// Generic queue with enqueue and dequeue functions.
class Queue<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
// Generic queue with enqueue and dequeue functions.
class Deque<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
// Generic queue with enqueue and dequeue functions.
class Deque2<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
// Generic queue with enqueue and dequeue functions.
class Deque3<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
// Generic queue with enqueue and dequeue functions.
class Deque4<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
// Generic queue with enqueue and dequeue functions.
class Deque5<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
// Generic queue with enqueue and dequeue functions.
class Deque6<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
// Generic queue with enqueue and dequeue functions.
class Deque7<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
// Generic queue with enqueue and dequeue functions.
class Deque8<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
// Generic queue with enqueue and dequeue functions.
class Deque9<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
// Generic queue with enqueue and dequeue functions.
class Deque10<Element>: StackProtocol {
private var storage: [Element] = []
func enqueue(_ element: Element) {
storage.append(element)
}
func dequeue() -> Element? {
return storage.removeFirst()
}
init() {}
}
// Generic queue with enqueue and dequeue functions.init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class Queue<Element>: StackProtocol { // type 'Queue<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Queue<Element>'class Deque<Element>: StackProtocol { // type 'Deque<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Deque<Element>'class Deque2<Element>: StackProtocol { // type 'Deque2<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Deque2<Element>'class Deque3<Element>: StackProtocol { // type 'Deque3<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Deque3<Element>'class Deque4<Element>: StackProtocol { // type 'Deque4<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Deque4<Element>'class Deque5<Element>: StackProtocol { // type 'Deque5<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Deque5<Element>'class Deque6<Element>: StackProtocol { // type 'Deque6<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Deque6<Element>'class Deque7<Element>: StackProtocol { // type 'Deque7<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Deque7<Element>'class Deque8<Element>: StackProtocol { // type 'Deque8<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Deque8<Element>'class Deque9<Element>: StackProtocol { // type 'Deque9<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Deque9<Element>'class Deque10<Element>: StackProtocol { // type 'Deque10<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Deque10<Element>'var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack2<Element: Equatable>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack3<Element: Comparable>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack4<Element: Hashable>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack5<Element: Codable>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack6<Element: CustomStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack7<Element: CustomDebugStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack8<Element: CustomDebugStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack9<Element: CustomDebugStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack10<Element: CustomDebugStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack11<Element: CustomDebugStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack12<Element: CustomDebugStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack2<Element: Equatable>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack3<Element: Comparable>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack4<Element: Hashable>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack5<Element: Codable>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack6<Element: CustomStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack7<Element: CustomDebugStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack8<Element: CustomDebugStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack9<Element: CustomDebugStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack10<Element: CustomDebugStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack11<Element: CustomDebugStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack12<Element: CustomDebugStringConvertible>: StackProtocol {
var elements: [Element] = []
init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack13<Element: CustomDebugStringConvertible>: StackProtocol {
var elements: [Element] = []init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack2<Element>'init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack3<Element>'init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack4<Element>'init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack5<Element>'init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack6<Element>'init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack7<Element>'init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack8<Element>'init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack9<Element>'init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack10<Element>'init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack11<Element>'init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack12<Element>'var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.popLast()
}
// Initialize the stack.
init() {
elements = []
}
}
class QueueStack<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}
class QueueStack2<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}
class QueueStack3<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}
class QueueStack4<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}
class QueueStack5<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}
class QueueStack6<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}
class QueueStack7<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.popLast()
}
// Initialize the stack.
init() {
elements = []
}
}
// A stack that uses a queue to implement the push and pop functions.
class QueueStack<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}
// A stack that uses a queue to implement the push and pop functions.
class QueueStack2<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}
// A stack that uses a queue to implement the push and pop functions.
class QueueStack3<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}
// A stack that uses a queue to implement the push and pop functions.
class QueueStack4<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}
// A stack that uses a queue to implement the push and pop functions.
class QueueStack5<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}
// A stack that uses a queue to implement the push and pop functions.
class QueueStack6<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}
// A stack that uses a queue to implement the push and pop functions.
class QueueStack7<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {
return elements.removeFirst()
}
// Initialize the stack.
init() {
elements = []
}
}
// A stack that uses a queue to implement the push and pop functions.
class QueueStack8<Element>: StackProtocol {
var elements: [Element] = []
// Add an element to the stack.
func push(_ element: Element) {
elements.append(element)
}
// Remove an element from the stack.
func pop() -> Element? {init() { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'init() { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'QueueStack<Element>'init() { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'QueueStack2<Element>'init() { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'QueueStack3<Element>'init() { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'QueueStack4<Element>'init() { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'QueueStack5<Element>'init() { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'QueueStack6<Element>'init() { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'QueueStack7<Element>'var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack2<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
func peek() -> Element? {
return elements.last
}
}
class Stack3<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
func peek() -> Element? {
return elements.last
}
var count: Int {
return elements.count
}
}
class Stack4<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
func peek() -> Element? {
return elements.last
}
var count: Int {
return elements.count
}
var isEmpty: Bool {
return elements.isEmpty
}
}
class Stack5<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
func peek() -> Element? {
return elements.last
}
var count: Int {
return elements.count
}
var isEmpty: Bool {
return elements.isEmpty
}
var top: Element? {
return elements.last
}
}
class Stack6<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
func peek() -> Element? {
return elements.last
}
var count: Int {
return elements.count
}
var isEmpty: Bool {
return elements.isEmpty
}
var top: Element? {
return elements.last
}
var bottom: Element? {
return elements.first
}
}
class Stack7<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
func peek() -> Element? {
return elements.last
}
var count: Int {
return elements.count
}
var isEmpty: Bool {
return elements.isEmpty
}
var top: Element? {
return elements.last
}
var bottom: Element? {
return elements.first
}
func contains(_ element: Element) -> Bool {
return elements.contains(element)
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push, pop, peek functions.
class Stack2<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
func peek() -> Element? {
return elements.last
}
}
// Generic stack with push, pop, peek, count functions.
class Stack3<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
func peek() -> Element? {
return elements.last
}
var count: Int {
return elements.count
}
}
// Generic stack with push, pop, peek, count, isEmpty functions.
class Stack4<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
func peek() -> Element? {
return elements.last
}
var count: Int {
return elements.count
}
var isEmpty: Bool {
return elements.isEmpty
}
}
// Generic stack with push, pop, peek, count, isEmpty, top functions.
class Stack5<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
func peek() -> Element? {
return elements.last
}
var count: Int {
return elements.count
}
var isEmpty: Bool {
return elements.isEmpty
}
var top: Element? {
return elements.last
}
}
// Generic stack with push, pop, peek, count, isEmpty, top, bottom functions.
class Stack6<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
func peek() -> Element? {
return elements.last
}
var count: Int {
return elements.count
}
var isEmpty: Bool {
return elements.isEmpty
}
var top: Element? {
return elements.last
}
var bottom: Element? {
return elements.first
}
}
// Generic stack with push, pop, peek, count, isEmpty, top, bottom, contains functions.
class Stack7<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
func peek() -> Element? {
return elements.last
}
var count: Int {
return elements.count
}
var isEmpty: Bool {
return elements.isEmpty
}
var top: Element? {
return elements.last
}
var bottom: Element? {
return elements.first
}
func contains(_ element: Element) -> Bool {
return elements.contains(element)
}
}
// Generic stack with push, pop, peek, count, isEmpty, top, bottom, contains, index(of:) functions.
class Stack8<Element>: StackProtocol {
var elements: [Element] = []
required init() { }
func push(_ element: Element) {
elements.append(element)
}
return elements.contains(element) // cannot convert value of type 'Element' to expected argument type '(Element) throws -> Bool'return elements.contains(element) // missing argument label 'where:' in callvar stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
private var storage = [Element]()
var isEmpty: Bool {
return storage.isEmpty
}
var count: Int {
return storage.count
}
func peek() -> Element? {
return storage.last
}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
struct StackOfStrings {
var items = [String]()
mutating func push(_ item: String) {
items.append(item)
}
mutating func pop() -> String? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var storage = [Element]()
var isEmpty: Bool {
return storage.isEmpty
}
var count: Int {
return storage.count
}
func peek() -> Element? {
return storage.last
}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Stack with a custom type.
struct StackOfStrings {
var items = [String]()
mutating func push(_ item: String) {
items.append(item)
}
mutating func pop() -> String? {
return items.popLast()
}
}
```class Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
class Stack2<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
class Stack3<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
class Stack4<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
class Stack5<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
class Stack6<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
class Stack7<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
class Stack8<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
class Stack9<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
class Stack10<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
class Stack11<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
class Stack12<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Generic stack with push and pop functions.
class Stack2<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Generic stack with push and pop functions.
class Stack3<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Generic stack with push and pop functions.
class Stack4<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Generic stack with push and pop functions.
class Stack5<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Generic stack with push and pop functions.
class Stack6<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Generic stack with push and pop functions.
class Stack7<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Generic stack with push and pop functions.
class Stack8<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Generic stack with push and pop functions.
class Stack9<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Generic stack with push and pop functions.
class Stack10<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Generic stack with push and pop functions.
class Stack11<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Generic stack with push and pop functions.
class Stack12<Element>: StackProtocol {
private var storage: [Element] = []
required init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Generic stackvar stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
class Stack2<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
class Stack3<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
class Stack4<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
class Stack5<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
class Stack6<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
class Stack7<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
class Stack8<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
class Stack9<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
class Stack10<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
class Stack11<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
class Stack12<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
class Stack13<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
class Stack14<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack2<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack3<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack4<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack5<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack6<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack7<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack8<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack9<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack10<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack11<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack12<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack13<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack14<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
elements.popLast()
}
}
// Generic stack with push and pop functions.
classclass Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class Stack2<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack2<Element>'class Stack3<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack3<Element>'class Stack4<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack4<Element>'class Stack5<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack5<Element>'class Stack6<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack6<Element>'class Stack7<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack7<Element>'class Stack8<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack8<Element>'class Stack9<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack9<Element>'class Stack10<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack10<Element>'class Stack11<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack11<Element>'class Stack12<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack12<Element>'class Stack13<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack13<Element>'class Stack14<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack14<Element>'var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
required init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class IntStack: Stack<Int> {
required init() {}
}
class StringStack: Stack<String> {
required init() {}
}
class DoubleStack: Stack<Double> {
required init() {}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
required init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// A stack that can only hold Ints
class IntStack: Stack<Int> {
required init() {}
}
// A stack that can only hold Strings
class StringStack: Stack<String> {
required init() {}
}
// A stack that can only hold Doubles
class DoubleStack: Stack<Double> {
required init() {}
}
let intStack = IntStack()
intStack.push(1)
intStack.push(2)
intStack.push(3)
intStack.pop() // returns 3
intStack.pop() // returns 2
intStack.pop() // returns 1
let stringStack = StringStack()
stringStack.push("hello")
stringStack.push("world")
stringStack.push("!")
stringStack.pop() // returns "!"
stringStack.pop() // returns "world"
stringStack.pop() // returns "hello"
let doubleStack = DoubleStack()
doubleStack.push(1.0)
doubleStack.push(2.0)
doubleStack.push(3.0)
doubleStack.pop() // returns 3.0
doubleStack.pop() // returns 2.0
doubleStack.pop() // returns 1.0
```var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private let capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
guard let element = cache[key] else { return nil }
accessOrder.remove(at: accessOrder.firstIndex(of: key)!)
accessOrder.append(key)
return element
}
set {
if let value = newValue {
cache[key] = value
accessOrder.remove(at: accessOrder.firstIndex(of: key)!)
accessOrder.append(key)
if cache.count > capacity {
let leastRecentlyUsedKey = accessOrder.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
} else {
cache.removeValue(forKey: key)
accessOrder.remove(at: accessOrder.firstIndex(of: key)!)
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private let capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
guard let element = cache[key] else { return nil }
accessOrder.remove(at: accessOrder.firstIndex(of: key)!)
accessOrder.append(key)
return element
}
set {
if let value = newValue {
cache[key] = value
accessOrder.remove(at: accessOrder.firstIndex(of: key)!)
accessOrder.append(key)
if cache.count > capacity {
let leastRecentlyUsedKey = accessOrder.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
} else {
cache.removeValue(forKey: key)
accessOrder.remove(at: accessOrder.firstIndex(of: key)!)
}
}
}
}
// Test the cache
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["a"] // Access "a" to make it the most recently used
cache["b"] // Access "b" to make it the second most recently used
cache["c"] // Access "c" to make it the third most recently used
cache["e"] = 5 // Adding a new entry with a key that already exists in the cache, should replace the least recently used entry
cache["a"] // Access "a" again to make it the most recently used
print(cache["a"]!) // 1
print(cache["b"]!) // 2
print(cache["c"]!) // 3
print(cache["d"]!) // 4
print(cache["e"]!) // 5
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private let capacity: Int
private var cache: [Key: Element] = [:]
private var accessHistory: [Key] = []
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
accessHistory.remove(at: accessHistory.firstIndex(of: key)!)
accessHistory.append(key)
return element
}
return nil
}
set {
if let newValue = newValue {
cache[key] = newValue
accessHistory.remove(at: accessHistory.firstIndex(of: key)!)
accessHistory.append(key)
if cache.count > capacity {
let keyToRemove = accessHistory.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
} else {
cache.removeValue(forKey: key)
accessHistory.remove(at: accessHistory.firstIndex(of: key)!)
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private let capacity: Int
private var cache: [Key: Element] = [:]
private var accessHistory: [Key] = []
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
accessHistory.remove(at: accessHistory.firstIndex(of: key)!)
accessHistory.append(key)
return element
}
return nil
}
set {
if let newValue = newValue {
cache[key] = newValue
accessHistory.remove(at: accessHistory.firstIndex(of: key)!)
accessHistory.append(key)
if cache.count > capacity {
let keyToRemove = accessHistory.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
} else {
cache.removeValue(forKey: key)
accessHistory.remove(at: accessHistory.firstIndex(of: key)!)
}
}
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.keys = []
}
subscript(key: Key) -> Element? {
get {
// If the key exists in the cache, move it to the front of the keys array to indicate it was recently used.
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.insert(key, at: 0)
}
return cache[key]
}
set {
// If the key already exists in the cache, move it to the front of the keys array to indicate it was recently used.
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.insert(key, at: 0)
} else {
// If the cache is at capacity, remove the least recently used item.
if cache.count == capacity {
let lastKey = keys.removeLast()
cache.removeValue(forKey: lastKey)
}
// Add the new key to the front of the keys array to indicate it was recently used.
keys.insert(key, at: 0)
}
cache[key] = newValue
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.keys = []
}
subscript(key: Key) -> Element? {
get {
// If the key exists in the cache, move it to the front of the keys array to indicate it was recently used.
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.insert(key, at: 0)
}
return cache[key]
}
set {
// If the key already exists in the cache, move it to the front of the keys array to indicate it was recently used.
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.insert(key, at: 0)
} else {
// If the cache is at capacity, remove the least recently used item.
if cache.count == capacity {
let lastKey = keys.removeLast()
cache.removeValue(forKey: lastKey)
}
// Add the new key to the front of the keys array to indicate it was recently used.
keys.insert(key, at: 0)
}
cache[key] = newValue
}
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private let capacity: Int
private var cache: [Key: Element] = [:]
private var accessOrder: [Key] = []
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
updateAccessOrder(key: key)
return element
}
return nil
}
set {
if let element = newValue {
if cache.count == capacity {
removeLeastRecentlyUsed()
}
cache[key] = element
accessOrder.append(key)
} else {
cache[key] = nil
accessOrder = accessOrder.filter { $0 != key }
}
}
}
private func updateAccessOrder(key: Key) {
accessOrder.remove(at: accessOrder.firstIndex(of: key)!)
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
guard let leastRecentlyUsedKey = accessOrder.first else { return }
accessOrder.remove(at: 0)
cache.removeValue(forKey: leastRecentlyUsedKey)
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private let capacity: Int
private var cache: [Key: Element] = [:]
private var accessOrder: [Key] = []
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
updateAccessOrder(key: key)
return element
}
return nil
}
set {
if let element = newValue {
if cache.count == capacity {
removeLeastRecentlyUsed()
}
cache[key] = element
accessOrder.append(key)
} else {
cache[key] = nil
accessOrder = accessOrder.filter { $0 != key }
}
}
}
private func updateAccessOrder(key: Key) {
accessOrder.remove(at: accessOrder.firstIndex(of: key)!)
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
guard let leastRecentlyUsedKey = accessOrder.first else { return }
accessOrder.remove(at: 0)
cache.removeValue(forKey: leastRecentlyUsedKey)
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element] = [:]
private var accessOrder: [Key] = []
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
guard let element = cache[key] else { return nil }
accessOrder.removeAll { $0 == key }
accessOrder.append(key)
return element
}
set {
if let value = newValue {
cache[key] = value
accessOrder.removeAll { $0 == key }
accessOrder.append(key)
while cache.count > capacity {
let leastRecentlyUsedKey = accessOrder.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll { $0 == key }
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element] = [:]
private var accessOrder: [Key] = []
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
guard let element = cache[key] else { return nil }
accessOrder.removeAll { $0 == key }
accessOrder.append(key)
return element
}
set {
if let value = newValue {
cache[key] = value
accessOrder.removeAll { $0 == key }
accessOrder.append(key)
while cache.count > capacity {
let leastRecentlyUsedKey = accessOrder.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll { $0 == key }
}
}
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache = [Key: Element]()
private var keyHistory: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
guard let value = cache[key] else { return nil }
moveKeyToFront(key: key)
return value
}
set {
guard let value = newValue else {
cache[key] = nil
return
}
if cache.count >= capacity {
evictLeastRecentlyUsed()
}
cache[key] = value
moveKeyToFront(key: key)
}
}
private func moveKeyToFront(key: Key) {
if let index = keyHistory.firstIndex(of: key) {
keyHistory.remove(at: index)
}
keyHistory.insert(key, at: 0)
}
private func evictLeastRecentlyUsed() {
guard let leastRecentlyUsedKey = keyHistory.last else { return }
keyHistory.removeLast()
cache[leastRecentlyUsedKey] = nil
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache = [Key: Element]()
private var keyHistory: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
guard let value = cache[key] else { return nil }
moveKeyToFront(key: key)
return value
}
set {
guard let value = newValue else {
cache[key] = nil
return
}
if cache.count >= capacity {
evictLeastRecentlyUsed()
}
cache[key] = value
moveKeyToFront(key: key)
}
}
private func moveKeyToFront(key: Key) {
if let index = keyHistory.firstIndex(of: key) {
keyHistory.remove(at: index)
}
keyHistory.insert(key, at: 0)
}
private func evictLeastRecentlyUsed() {
guard let leastRecentlyUsedKey = keyHistory.last else { return }
keyHistory.removeLast()
cache[leastRecentlyUsedKey] = nil
}
}
// Example usage:
let cache = Cache<Int, String>(capacity: 3)
cache[1] = "One"
cache[2] = "Two"
cache[3] = "Three"
print(cache[1]) // Output: Optional("One")
cache[4] = "Four"
print(cache[2]) // Output: nil
print(cache[3]) // Output: Optional("Three")
print(cache[4]) // Output: Optional("Four")
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private let capacity: Int
private var cache: [Key: Element] = [:]
private var accessOrder: [Key] = []
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
guard let element = cache[key] else {
return nil
}
moveElementToFront(key: key)
return element
}
set {
if let newValue = newValue {
cache[key] = newValue
if accessOrder.contains(key) {
moveElementToFront(key: key)
} else {
accessOrder.append(key)
}
if accessOrder.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache[key] = nil
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func moveElementToFront(key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
accessOrder.append(key)
}
}
private func removeLeastRecentlyUsed() {
if let keyToRemove = accessOrder.first {
cache[keyToRemove] = nil
accessOrder.removeFirst()
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private let capacity: Int
private var cache: [Key: Element] = [:]
private var accessOrder: [Key] = []
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
guard let element = cache[key] else {
return nil
}
moveElementToFront(key: key)
return element
}
set {
if let newValue = newValue {
cache[key] = newValue
if accessOrder.contains(key) {
moveElementToFront(key: key)
} else {
accessOrder.append(key)
}
if accessOrder.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache[key] = nil
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func moveElementToFront(key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
accessOrder.append(key)
}
}
private func removeLeastRecentlyUsed() {
if let keyToRemove = accessOrder.first {
cache[keyToRemove] = nil
accessOrder.removeFirst()
}
}
}
// Example usage:
let cache = Cache<String, String>(capacity: 3)
cache["key1"] = "value1"
cache["key2"] = "value2"
cache["key3"] = "value3"
print(cache["key1"]) // Output: value1
cache["key4"] = "value4"
print(cache["key2"]) // Output: nil
print(cache["key3"]) // Output: value3
print(cache["key4"]) // Output: value4
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache = [Key: Element]()
private var leastRecentlyUsed: [Key: Int] = [:]
private var capacity: Int
private var counter: Int = 0
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
counter += 1
leastRecentlyUsed[key] = counter
return element
}
return nil
}
set(newValue) {
if let newValue = newValue {
if cache.count < capacity {
cache[key] = newValue
counter += 1
leastRecentlyUsed[key] = counter
} else {
// Find the least recently used item and remove it
let leastRecentlyUsedKey = leastRecentlyUsed.min(by: { $0.value < $1.value })?.key
cache.removeValue(forKey: leastRecentlyUsedKey!)
cache[key] = newValue
counter += 1
leastRecentlyUsed[key] = counter
}
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache = [Key: Element]()
private var leastRecentlyUsed: [Key: Int] = [:]
private var capacity: Int
private var counter: Int = 0
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
counter += 1
leastRecentlyUsed[key] = counter
return element
}
return nil
}
set(newValue) {
if let newValue = newValue {
if cache.count < capacity {
cache[key] = newValue
counter += 1
leastRecentlyUsed[key] = counter
} else {
// Find the least recently used item and remove it
let leastRecentlyUsedKey = leastRecentlyUsed.min(by: { $0.value < $1.value })?.key
cache.removeValue(forKey: leastRecentlyUsedKey!)
cache[key] = newValue
counter += 1
leastRecentlyUsed[key] = counter
}
} else {
cache.removeValue(forKey: key)
}
}
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private let capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
// MARK: - Init
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
// MARK: - Subscript
subscript(key: Key) -> Element? {
get {
guard let element = cache[key] else { return nil }
move(toFront: key)
return element
}
set {
if let element = newValue {
cache[key] = element
move(toFront: key)
} else {
cache.removeValue(forKey: key)
removeLast()
}
}
}
// MARK: - Private
private func move(toFront key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.insert(key, at: 0)
}
private func removeLast() {
while cache.count > capacity {
guard let lastKey = accessOrder.last else { return }
cache.removeValue(forKey: lastKey)
accessOrder.removeLast()
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private let capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
// MARK: - Init
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
// MARK: - Subscript
subscript(key: Key) -> Element? {
get {
guard let element = cache[key] else { return nil }
move(toFront: key)
return element
}
set {
if let element = newValue {
cache[key] = element
move(toFront: key)
} else {
cache.removeValue(forKey: key)
removeLast()
}
}
}
// MARK: - Private
private func move(toFront key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.insert(key, at: 0)
}
private func removeLast() {
while cache.count > capacity {
guard let lastKey = accessOrder.last else { return }
cache.removeValue(forKey: lastKey)
accessOrder.removeLast()
}
}
}
``` // XCTAssertNil failed: expression is not nilprotocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var accessOrder: [Key] = []
private var capacity: Int
required init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
moveKeyToFront(key: key)
return element
}
return nil
}
set(newValue) {
if let newValue = newValue {
if cache.count == capacity {
removeLeastRecentlyUsed()
}
cache[key] = newValue
accessOrder.append(key)
} else {
cache[key] = nil
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func moveKeyToFront(key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
accessOrder.append(key)
}
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsed = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsed)
accessOrder.removeFirst()
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var accessOrder: [Key] = []
private var capacity: Int
required init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
moveKeyToFront(key: key)
return element
}
return nil
}
set(newValue) {
if let newValue = newValue {
if cache.count == capacity {
removeLeastRecentlyUsed()
}
cache[key] = newValue
accessOrder.append(key)
} else {
cache[key] = nil
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func moveKeyToFront(key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
accessOrder.append(key)
}
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsed = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsed)
accessOrder.removeFirst()
}
}
}
```protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private let cache = NSCache<Key, Value>()
private let expirationQueue = DispatchQueue(label: "ExpirableCache.expirationQueue", attributes: .concurrent)
private let expirationSemaphore = DispatchSemaphore(value: 1)
private let expirationInterval: TimeInterval
init(expirationInterval: TimeInterval) {
self.expirationInterval = expirationInterval
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache.setObject(value, forKey: key)
expirationQueue.async {
self.expirationSemaphore.wait()
defer { self.expirationSemaphore.signal() }
// Add a delay to the expiration time to account for the time it takes to execute the code.
// This ensures that the expiration time is not exceeded.
let delay = expiration - self.expirationInterval
DispatchQueue.main.asyncAfter(deadline: .now() + delay) {
self.cache.removeObject(forKey: key)
}
}
}
func get(key: Key) -> Value? {
return cache.object(forKey: key)
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set(newValue) { put(value: newValue, key: key, expiration: expirationInterval) }
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private let cache = NSCache<Key, Value>()
private let expirationQueue = DispatchQueue(label: "ExpirableCache.expirationQueue", attributes: .concurrent)
private let expirationSemaphore = DispatchSemaphore(value: 1)
private let expirationInterval: TimeInterval
init(expirationInterval: TimeInterval) {
self.expirationInterval = expirationInterval
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache.setObject(value, forKey: key)
expirationQueue.async {
self.expirationSemaphore.wait()
defer { self.expirationSemaphore.signal() }
// Add a delay to the expiration time to account for the time it takes to execute the code.
// This ensures that the expiration time is not exceeded.
let delay = expiration - self.expirationInterval
DispatchQueue.main.asyncAfter(deadline: .now() + delay) {
self.cache.removeObject(forKey: key)
}
}
}
func get(key: Key) -> Value? {
return cache.object(forKey: key)
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set(newValue) { put(value: newValue, key: key, expiration: expirationInterval) }
}
}
```private let cache = NSCache<Key, Value>() // 'NSCache' requires that 'Key' be a class typeset(newValue) { put(value: newValue, key: key, expiration: expirationInterval) } // value of optional type 'Value?' must be unwrapped to a value of type 'Value'let cache = ExpirableCache<String, String>() // missing argument for parameter 'expirationInterval' in callThread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (Value, Date)]
private var expiration: TimeInterval
init(expiration: TimeInterval) {
self.cache = [:]
self.expiration = expiration
}
subscript(key: Key) -> Value? {
get {
guard let cachedValue = cache[key] else {
return nil
}
let value = cachedValue.0
let date = cachedValue.1
if Date().timeIntervalSince(date) > expiration {
cache.removeValue(forKey: key)
return nil
}
return value
}
set(newValue) {
cache[key] = (newValue, Date())
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
guard let cachedValue = cache[key] else {
return nil
}
let value = cachedValue.0
let date = cachedValue.1
if Date().timeIntervalSince(date) > expiration {
cache.removeValue(forKey: key)
return nil
}
return value
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (Value, Date)]
private var expiration: TimeInterval
init(expiration: TimeInterval) {
self.cache = [:]
self.expiration = expiration
}
subscript(key: Key) -> Value? {
get {
guard let cachedValue = cache[key] else {
return nil
}
let value = cachedValue.0
let date = cachedValue.1
if Date().timeIntervalSince(date) > expiration {
cache.removeValue(forKey: key)
return nil
}
return value
}
set(newValue) {
cache[key] = (newValue, Date())
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
guard let cachedValue = cache[key] else {
return nil
}
let value = cachedValue.0
let date = cachedValue.1
if Date().timeIntervalSince(date) > expiration {
cache.removeValue(forKey: key)
return nil
}
return value
}
}
```cache[key] = (newValue, Date()) // cannot assign value of type '(Value?, Date)' to subscript of type '(Value, Date)'let cache = ExpirableCache<String, String>() // missing argument for parameter 'expiration' in callThread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private let queue = DispatchQueue(label: "ExpirableCache", qos: .background)
private var cache: [Key: (Value, Date)] = [:]
// Put value in cache with expiration time.
// If value already exists in cache, then expiration time will be updated.
// If expiration time is 0, then value will be stored forever.
// If expiration time is negative, then value will be stored forever.
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
if let (_, expiration) = self.cache[key] {
if expiration.timeIntervalSinceNow < 0 {
self.cache[key] = (value, Date().addingTimeInterval(expiration))
}
} else {
self.cache[key] = (value, Date().addingTimeInterval(expiration))
}
}
}
// Get value from cache.
// If value doesn't exist or expired, then nil will be returned.
func get(key: Key) -> Value? {
queue.sync {
if let (value, expiration) = self.cache[key] {
if expiration.timeIntervalSinceNow > 0 {
return value
}
}
return nil
}
}
// Subscript methods used for convenient access.
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 0)
} else {
queue.async {
self.cache[key] = nil
}
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private let queue = DispatchQueue(label: "ExpirableCache", qos: .background)
private var cache: [Key: (Value, Date)] = [:]
// Put value in cache with expiration time.
// If value already exists in cache, then expiration time will be updated.
// If expiration time is 0, then value will be stored forever.
// If expiration time is negative, then value will be stored forever.
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
if let (_, expiration) = self.cache[key] {
if expiration.timeIntervalSinceNow < 0 {
self.cache[key] = (value, Date().addingTimeInterval(expiration))
}
} else {
self.cache[key] = (value, Date().addingTimeInterval(expiration))
}
}
}
// Get value from cache.
// If value doesn't exist or expired, then nil will be returned.
func get(key: Key) -> Value? {
queue.sync {
if let (value, expiration) = self.cache[key] {
if expiration.timeIntervalSinceNow > 0 {
return value
}
}
return nil
}
}
// Subscript methods used for convenient access.
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 0)
} else {
queue.async {
self.cache[key] = nil
}
}
}
}
}
// Example usage.
let cache = ExpirableCache<String, Int>()
cache.put(value: 1, key: "key", expiration: 10)
cache.put(value: 2, key: "key", expiration: 10)
cache.put(value: 3, key: "key", expiration: 10)
cache.put(value: 4, key: "key", expiration: 10)
cache.put(value: 5, key: "key", expiration: 10)
cache.put(value: 6, key: "key", expiration: 10)
cache.put(value: 7, key: "key", expiration: 10)
cache.put(value: 8, key: "key", expiration: 10)
cache.put(value: 9, key: "key", expiration: 10)
cache.put(value: 10, key: "key", expiration: 10)
cache.put(value: 11, key: "key", expiration: 10)
cache.put(value: 12, key: "key", expiration: 10)
cache.put(value: 13, key: "key", expiration: 10)
cache.put(value: 14, key: "key", expiration: 10)
cache.put(value: 15, key: "key", expiration: 10)
cache.put(value: 16, key: "key", expiration: 10)
cache.put(value: 17, key: "key", expiration: 10)
cache.put(value: 18, key: "key", expiration: 10)
cache.put(value: 19, key: "key", expiration: 10)
cache.put(value: 20, key: "key", expiration: 10)
cache.put(value: 21, key: "key", expiration: 10)
cache.put(value: 22, key: "key", expiration: 10)
cache.put(value: 23, key: "key", expiration: 10)
cache.put(value: 24, key: "key", expiration: 10)
cache.put(value: 25, key: "key", expiration: 10)
cache.put(value: 26, key: "key", expiration: 10)
cache.put(value: 27, key: "key", expiration: 10)
cache.self.cache[key] = (value, Date().addingTimeInterval(expiration)) // cannot convert value of type 'Date' to expected argument type 'TimeInterval' (aka 'Double')Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (Value, Date)]()
private var expirationInterval: TimeInterval
init(expirationInterval: TimeInterval) {
self.expirationInterval = expirationInterval
}
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date().addingTimeInterval(expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expirationDate) = cache[key], expirationDate >= Date() else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: expirationInterval)
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (Value, Date)]()
private var expirationInterval: TimeInterval
init(expirationInterval: TimeInterval) {
self.expirationInterval = expirationInterval
}
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date().addingTimeInterval(expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expirationDate) = cache[key], expirationDate >= Date() else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: expirationInterval)
} else {
cache.removeValue(forKey: key)
}
}
}
}
```let cache = ExpirableCache<String, String>() // missing argument for parameter 'expirationInterval' in callThread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: Value] = [:]
private var expirations: [Key: TimeInterval] = [:]
private let queue = DispatchQueue(label: "ExpirableCache")
// Put value into cache with expiration time.
// If value already exists in cache, it will be overwritten.
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.sync {
cache[key] = value
expirations[key] = expiration
scheduleExpiration(key: key, expiration: expiration)
}
}
// Get value from cache.
// If value is not found or it has expired, nil will be returned.
func get(key: Key) -> Value? {
queue.sync {
guard let expiration = expirations[key] else { return nil }
guard Date().timeIntervalSince1970 < expiration else { return nil }
return cache[key]
}
}
// Subscript method for convenient access.
subscript(key: Key) -> Value? {
get { return get(key: key) }
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: Date().timeIntervalSince1970 + 60 * 60 * 24)
} else {
queue.sync {
cache.removeValue(forKey: key)
expirations.removeValue(forKey: key)
}
}
}
}
// Schedule expiration for key.
private func scheduleExpiration(key: Key, expiration: TimeInterval) {
queue.asyncAfter(deadline: .now() + expiration - Date().timeIntervalSince1970) {
self.queue.sync {
self.cache.removeValue(forKey: key)
self.expirations.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: Value] = [:]
private var expirations: [Key: TimeInterval] = [:]
private let queue = DispatchQueue(label: "ExpirableCache")
// Put value into cache with expiration time.
// If value already exists in cache, it will be overwritten.
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.sync {
cache[key] = value
expirations[key] = expiration
scheduleExpiration(key: key, expiration: expiration)
}
}
// Get value from cache.
// If value is not found or it has expired, nil will be returned.
func get(key: Key) -> Value? {
queue.sync {
guard let expiration = expirations[key] else { return nil }
guard Date().timeIntervalSince1970 < expiration else { return nil }
return cache[key]
}
}
// Subscript method for convenient access.
subscript(key: Key) -> Value? {
get { return get(key: key) }
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: Date().timeIntervalSince1970 + 60 * 60 * 24)
} else {
queue.sync {
cache.removeValue(forKey: key)
expirations.removeValue(forKey: key)
}
}
}
}
// Schedule expiration for key.
private func scheduleExpiration(key: Key, expiration: TimeInterval) {
queue.asyncAfter(deadline: .now() + expiration - Date().timeIntervalSince1970) {
self.queue.sync {
self.cache.removeValue(forKey: key)
self.expirations.removeValue(forKey: key)
}
}
}
}
// Usage example:
let cache = ExpirableCache<String, Int>()
cache["key1"] = 1
cache["key2"] = 2
cache["key1"]
cache["key2"]
cache["key1"] = nil
cache["key2"]
cache["key1"]
cache["key2"]
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private let queue = DispatchQueue(label: "ExpirableCache")
private var cache = [Key: Value]()
private var expirationTimes = [Key: DispatchTime]()
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = value
self.expirationTimes[key] = DispatchTime.now() + expiration
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let expirationTime = expirationTimes[key],
expirationTime > DispatchTime.now() else {
self.cache.removeValue(forKey: key)
self.expirationTimes.removeValue(forKey: key)
return nil
}
return cache[key]
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private let queue = DispatchQueue(label: "ExpirableCache")
private var cache = [Key: Value]()
private var expirationTimes = [Key: DispatchTime]()
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = value
self.expirationTimes[key] = DispatchTime.now() + expiration
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let expirationTime = expirationTimes[key],
expirationTime > DispatchTime.now() else {
self.cache.removeValue(forKey: key)
self.expirationTimes.removeValue(forKey: key)
return nil
}
return cache[key]
}
}
}
// Example usage.
let cache = ExpirableCache<String, String>()
cache.put(value: "Hello", key: "key", expiration: 10)
let value = cache.get(key: "key")
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private let cache = NSCache<AnyObject, AnyObject>()
private var expirationTimes = [Key: TimeInterval]()
func put(value: Value, key: Key, expiration: TimeInterval) {
cache.setObject(value as AnyObject, forKey: key as AnyObject)
expirationTimes[key] = expiration
}
func get(key: Key) -> Value? {
guard let value = cache.object(forKey: key as AnyObject) as? Value,
expirationTimes[key]! > Date().timeIntervalSince1970 else {
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
cache.removeObject(forKey: key as AnyObject)
return
}
put(value: value, key: key, expiration: Date().timeIntervalSince1970 + 10)
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private let cache = NSCache<AnyObject, AnyObject>()
private var expirationTimes = [Key: TimeInterval]()
func put(value: Value, key: Key, expiration: TimeInterval) {
cache.setObject(value as AnyObject, forKey: key as AnyObject)
expirationTimes[key] = expiration
}
func get(key: Key) -> Value? {
guard let value = cache.object(forKey: key as AnyObject) as? Value,
expirationTimes[key]! > Date().timeIntervalSince1970 else {
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
cache.removeObject(forKey: key as AnyObject)
return
}
put(value: value, key: key, expiration: Date().timeIntervalSince1970 + 10)
}
}
}
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertEqual failed: (nil) is not equal to (Optional("Hello, SwiftEval!"))protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: Value]()
private var cacheExpiration = [Key: TimeInterval]()
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
cacheExpiration[key] = expiration
}
func get(key: Key) -> Value? {
if let expiration = cacheExpiration[key], Date().timeIntervalSince1970 >= expiration {
cache.removeValue(forKey: key)
cacheExpiration.removeValue(forKey: key)
return nil
}
return cache[key]
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: Value]()
private var cacheExpiration = [Key: TimeInterval]()
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
cacheExpiration[key] = expiration
}
func get(key: Key) -> Value? {
if let expiration = cacheExpiration[key], Date().timeIntervalSince1970 >= expiration {
cache.removeValue(forKey: key)
cacheExpiration.removeValue(forKey: key)
return nil
}
return cache[key]
}
}
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertEqual failed: (nil) is not equal to (Optional("Hello, SwiftEval!"))protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: Value] = [:]
private var expirations: [Key: TimeInterval] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirations[key] = expiration
}
func get(key: Key) -> Value? {
guard let expiration = expirations[key] else { return nil }
if expiration < Date().timeIntervalSince1970 {
cache.removeValue(forKey: key)
expirations.removeValue(forKey: key)
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set(newValue) {
guard let newValue = newValue else { return }
put(value: newValue, key: key, expiration: Date().timeIntervalSince1970 + 60)
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: Value] = [:]
private var expirations: [Key: TimeInterval] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirations[key] = expiration
}
func get(key: Key) -> Value? {
guard let expiration = expirations[key] else { return nil }
if expiration < Date().timeIntervalSince1970 {
cache.removeValue(forKey: key)
expirations.removeValue(forKey: key)
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set(newValue) {
guard let newValue = newValue else { return }
put(value: newValue, key: key, expiration: Date().timeIntervalSince1970 + 60)
}
}
}
let cache = ExpirableCache<String, String>()
cache["test"] = "test"
cache["test"]
cache["test"] = "test2"
cache["test"]
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertEqual failed: (nil) is not equal to (Optional("Hello, SwiftEval!"))protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private let cache = NSCache<AnyObject, AnyObject>()
private var expirationTimes = [Key: TimeInterval]()
func put(value: Value, key: Key, expiration: TimeInterval) {
cache.setObject(value as AnyObject, forKey: key as AnyObject)
expirationTimes[key] = Date().timeIntervalSince1970 + expiration
}
func get(key: Key) -> Value? {
let expirationTime = expirationTimes[key] ?? 0
if expirationTime < Date().timeIntervalSince1970 {
remove(key: key)
return nil
}
return cache.object(forKey: key as AnyObject) as? Value
}
func remove(key: Key) {
cache.removeObject(forKey: key as AnyObject)
expirationTimes.removeValue(forKey: key)
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private let cache = NSCache<AnyObject, AnyObject>()
private var expirationTimes = [Key: TimeInterval]()
func put(value: Value, key: Key, expiration: TimeInterval) {
cache.setObject(value as AnyObject, forKey: key as AnyObject)
expirationTimes[key] = Date().timeIntervalSince1970 + expiration
}
func get(key: Key) -> Value? {
let expirationTime = expirationTimes[key] ?? 0
if expirationTime < Date().timeIntervalSince1970 {
remove(key: key)
return nil
}
return cache.object(forKey: key as AnyObject) as? Value
}
func remove(key: Key) {
cache.removeObject(forKey: key as AnyObject)
expirationTimes.removeValue(forKey: key)
}
}
// Usage example:
let cache = ExpirableCache<String, String>()
cache.put(value: "Hello", key: "key", expiration: 10)
cache.get(key: "key") // "Hello"
cache.get(key: "key") // nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let encryptedData = data.map { $0 ^ key.first! }
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let decryptedData = data.map { $0 ^ key.first! }
let decryptedString = String(data: decryptedData, encoding: .utf8)!
return decryptedString
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let encryptedData = data.map { $0 ^ key.first! }
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let decryptedData = data.map { $0 ^ key.first! }
let decryptedString = String(data: decryptedData, encoding: .utf8)!
return decryptedString
}
}
let encryptor = Encryptor()
let encrypted = encryptor.encrypt("Hello, world!", "12345678")
print(encrypted) // Prints: [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, let encryptedData = data.map { $0 ^ key.first! } // cannot convert value of type 'String.Element' (aka 'Character') to expected argument type 'UInt8'let decryptedData = data.map { $0 ^ key.first! } // cannot convert value of type 'String.Element' (aka 'Character') to expected argument type 'UInt8'protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let encryptedData = encrypt(data, key)
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let decryptedData = decrypt(data, key)
guard let decryptedString = String(data: decryptedData, encoding: .utf8) else {
return ""
}
return decryptedString
}
func encrypt(_ data: Data, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!.bytes
let encryptedData = data.bytes.enumerated().map { index, byte in
byte ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!.bytes
let decryptedData = data.bytes.enumerated().map { index, byte in
byte ^ keyData[index % keyData.count]
}
return Data(decryptedData)
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let encryptedData = encrypt(data, key)
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let decryptedData = decrypt(data, key)
guard let decryptedString = String(data: decryptedData, encoding: .utf8) else {
return ""
}
return decryptedString
}
func encrypt(_ data: Data, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!.bytes
let encryptedData = data.bytes.enumerated().map { index, byte in
byte ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!.bytes
let decryptedData = data.bytes.enumerated().map { index, byte in
byte ^ keyData[index % keyData.count]
}
return Data(decryptedData)
}
}
```let decryptedData = decrypt(data, key) // ambiguous use of 'decrypt'let keyData = key.data(using: .utf8)!.bytes // value of type 'Data' has no member 'bytes'let encryptedData = data.bytes.enumerated().map { index, byte in // value of type 'Data' has no member 'bytes'let keyData = key.data(using: .utf8)!.bytes // value of type 'Data' has no member 'bytes'let decryptedData = data.bytes.enumerated().map { index, byte in // value of type 'Data' has no member 'bytes'let decryptedText = encryptor.decrypt(encryptedData, key) // ambiguous use of 'decrypt'protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return String(bytes: decryptedData, encoding: .utf8) ?? ""
}
}
class Encryptor2: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return String(bytes: decryptedData, encoding: .utf8) ?? ""
}
}
class Encryptor3: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return String(bytes: decryptedData, encoding: .utf8) ?? ""
}
}
class Encryptor4: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return String(bytes: decryptedData, encoding: .utf8) ?? ""
}
}
class Encryptor5: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return String(bytes: decryptedData, encoding: .utf8) ?? ""
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return String(bytes: decryptedData, encoding: .utf8) ?? ""
}
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor2: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return String(bytes: decryptedData, encoding: .utf8) ?? ""
}
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor3: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return String(bytes: decryptedData, encoding: .utf8) ?? ""
}
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor4: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return String(bytes: decryptedData, encoding: .utf8) ?? ""
}
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor5: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = data.map { byte in
return byte ^ keyData[byte.byteSwapped]
}
return String(bytes: decryptedData, encoding: .utf8) ?? ""
}
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor6: EncryptorProtocol {
func encryptreturn byte ^ keyData[byte.byteSwapped] // cannot convert value of type 'UInt8' to expected argument type 'Data.Index' (aka 'Int')return byte ^ keyData[byte.byteSwapped] // cannot convert value of type 'UInt8' to expected argument type 'Data.Index' (aka 'Int')return byte ^ keyData[byte.byteSwapped] // cannot convert value of type 'UInt8' to expected argument type 'Data.Index' (aka 'Int')return byte ^ keyData[byte.byteSwapped] // cannot convert value of type 'UInt8' to expected argument type 'Data.Index' (aka 'Int')return byte ^ keyData[byte.byteSwapped] // cannot convert value of type 'UInt8' to expected argument type 'Data.Index' (aka 'Int')return byte ^ keyData[byte.byteSwapped] // cannot convert value of type 'UInt8' to expected argument type 'Data.Index' (aka 'Int')return byte ^ keyData[byte.byteSwapped] // cannot convert value of type 'UInt8' to expected argument type 'Data.Index' (aka 'Int')return byte ^ keyData[byte.byteSwapped] // cannot convert value of type 'UInt8' to expected argument type 'Data.Index' (aka 'Int')return byte ^ keyData[byte.byteSwapped] // cannot convert value of type 'UInt8' to expected argument type 'Data.Index' (aka 'Int')return byte ^ keyData[byte.byteSwapped] // cannot convert value of type 'UInt8' to expected argument type 'Data.Index' (aka 'Int')protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let stringData = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
let encryptedData = Data(stringData.enumerated().map { $0.element ^ keyData[$0.offset % keyData.count] })
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = Data(data.enumerated().map { $0.element ^ keyData[$0.offset % keyData.count] })
return String(data: decryptedData, encoding: .utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let stringData = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
let encryptedData = Data(stringData.enumerated().map { $0.element ^ keyData[$0.offset % keyData.count] })
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = Data(data.enumerated().map { $0.element ^ keyData[$0.offset % keyData.count] })
return String(data: decryptedData, encoding: .utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let plainText = string.data(using: .utf8)
let keyData = key.data(using: .utf8)!
let cipherText = Data(plainText!.enumerated().map { index, byte in
byte ^ keyData[index % keyData.count]
})
return cipherText
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let plainText = Data(data.enumerated().map { index, byte in
byte ^ keyData[index % keyData.count]
})
return String(data: plainText, encoding: .utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let plainText = string.data(using: .utf8)
let keyData = key.data(using: .utf8)!
let cipherText = Data(plainText!.enumerated().map { index, byte in
byte ^ keyData[index % keyData.count]
})
return cipherText
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let plainText = Data(data.enumerated().map { index, byte in
byte ^ keyData[index % keyData.count]
})
return String(data: plainText, encoding: .utf8)!
}
}
let encryptor = Encryptor()
let encrypted = encryptor.encrypt("Hello World", "Key")
let decrypted = encryptor.decrypt(encrypted, "Key")
print(decrypted)
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let plainText = string.data(using: .utf8)!
let encryptedText = plainText.withUnsafeBytes { (plainTextBytes: UnsafeRawBufferPointer) -> Data in
let encryptedTextBytes = plainTextBytes.map { byte in
return byte ^ key.utf8.first!
}
return Data(encryptedTextBytes)
}
return encryptedText
}
func decrypt(_ data: Data, _ key: String) -> String {
let encryptedText = data.withUnsafeBytes { (encryptedTextBytes: UnsafeRawBufferPointer) -> Data in
let plainTextBytes = encryptedTextBytes.map { byte in
return byte ^ key.utf8.first!
}
return Data(plainTextBytes)
}
return String(data: encryptedText, encoding: .utf8)!
}
}
class EncryptorWrapper {
static let shared = Encryptor()
}
class EncryptorWrapperWrapper {
static let shared = EncryptorWrapper()
}
class EncryptorWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapper()
}
class EncryptorWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapper()
}
class EncryptorWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapper()
}
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapper()
}
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapper()
}
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let plainText = string.data(using: .utf8)!
let encryptedText = plainText.withUnsafeBytes { (plainTextBytes: UnsafeRawBufferPointer) -> Data in
let encryptedTextBytes = plainTextBytes.map { byte in
return byte ^ key.utf8.first!
}
return Data(encryptedTextBytes)
}
return encryptedText
}
func decrypt(_ data: Data, _ key: String) -> String {
let encryptedText = data.withUnsafeBytes { (encryptedTextBytes: UnsafeRawBufferPointer) -> Data in
let plainTextBytes = encryptedTextBytes.map { byte in
return byte ^ key.utf8.first!
}
return Data(plainTextBytes)
}
return String(data: encryptedText, encoding: .utf8)!
}
}
// A simple class that uses a singleton pattern to provide a single instance of the Encryptor class.
class EncryptorWrapper {
static let shared = Encryptor()
}
// A simple class that uses a singleton pattern to provide a single instance of the EncryptorWrapper class.
class EncryptorWrapperWrapper {
static let shared = EncryptorWrapper()
}
// A simple class that uses a singleton pattern to provide a single instance of the EncryptorWrapperWrapper class.
class EncryptorWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapper()
}
// A simple class that uses a singleton pattern to provide a single instance of the EncryptorWrapperWrapperWrapper class.
class EncryptorWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapper()
}
// A simple class that uses a singleton pattern to provide a single instance of the EncryptorWrapperWrapperWrapperWrapper class.
class EncryptorWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapper()
}
// A simple class that uses a singleton pattern to provide a single instance of the EncryptorWrapperWrapperWrapperWrapperWrapper class.
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapper()
}
// A simple class that uses a singleton pattern to provide a single instance of the EncryptorWrapperWrapperWrapperWrapperWrapperWrapper class.
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapper()
}
// A simple class that uses a singleton pattern to provide a single instance of the EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapper class.
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}
// A simple class that uses a singleton pattern to provide a single instance of the EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper class.
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}
// A simple class that uses a singleton pattern to provide a single instance of the EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper class.
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}
// A simple class that uses a singleton pattern to provide a single instance of the EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper class.
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}
// A simple class that uses a singleton pattern to provide a single instance of the EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper class.
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}
// A simple class that uses a singleton pattern to provide a single instance of the EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper class.
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}
// A simple class that uses a singleton pattern to provide a single instance of the EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper class.
class EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper {
static let shared = EncryptorWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapperWrapper()
}
// A // XCTAssertEqual failed: (Optional("8\u{15}\u{1C}\u{1C}\u{1F}\\P#\u{07}\u{19}\u{16}\u{04}5\u{06}\u{11}\u{1C}Q")) is not equal to (Optional("8\u{04}\u{1F}\u{1F}\u{1F}DR2\u{04}\u{0C}\u{16}\u{15}6\u{05}\u{11}\u{04}S"))protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let plainText = string.data(using: .utf8)!
let encryptedText = Data(
plainText.enumerated().map {
$1.byte ^ key[$0 % key.count].byte
}
)
return encryptedText
}
func decrypt(_ data: Data, _ key: String) -> String {
let encryptedText = data
let plainText = Data(
encryptedText.enumerated().map {
$1.byte ^ key[$0 % key.count].byte
}
)
return String(data: plainText, encoding: .utf8)!
}
}
class EncryptorRunner {
let encryptor = Encryptor()
let key = "password"
func run() {
let plainText = "Hello, World!"
let encryptedText = encryptor.encrypt(plainText, key)
print("Encrypted text: \(encryptedText)")
let decryptedText = encryptor.decrypt(encryptedText, key)
print("Decrypted text: \(decryptedText)")
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let plainText = string.data(using: .utf8)!
let encryptedText = Data(
plainText.enumerated().map {
$1.byte ^ key[$0 % key.count].byte
}
)
return encryptedText
}
func decrypt(_ data: Data, _ key: String) -> String {
let encryptedText = data
let plainText = Data(
encryptedText.enumerated().map {
$1.byte ^ key[$0 % key.count].byte
}
)
return String(data: plainText, encoding: .utf8)!
}
}
// A class that implements a protocol that encrypts and decrypts a string using the XOR algorithm.
class EncryptorRunner {
let encryptor = Encryptor()
let key = "password"
func run() {
let plainText = "Hello, World!"
let encryptedText = encryptor.encrypt(plainText, key)
print("Encrypted text: \(encryptedText)")
let decryptedText = encryptor.decrypt(encryptedText, key)
print("Decrypted text: \(decryptedText)")
}
}
let encryptorRunner = EncryptorRunner()
encryptorRunner.run()
```$1.byte ^ key[$0 % key.count].byte // value of type 'Character' has no member 'byte'$1.byte ^ key[$0 % key.count].byte // value of type 'Data.Element' (aka 'UInt8') has no member 'byte'$1.byte ^ key[$0 % key.count].byte // value of type 'Character' has no member 'byte'$1.byte ^ key[$0 % key.count].byte // value of type 'Data.Element' (aka 'UInt8') has no member 'byte'protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)
let stringData = string.data(using: .utf8)
var encryptedData = Data(capacity: stringData!.count)
for (index, char) in stringData!.enumerated() {
let encryptedChar = char ^ keyData![index % keyData!.count]
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)
var decryptedData = Data(capacity: data.count)
for (index, char) in data.enumerated() {
let decryptedChar = char ^ keyData![index % keyData!.count]
decryptedData.append(decryptedChar)
}
return String(data: decryptedData, encoding: .utf8) ?? ""
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)
let stringData = string.data(using: .utf8)
var encryptedData = Data(capacity: stringData!.count)
for (index, char) in stringData!.enumerated() {
let encryptedChar = char ^ keyData![index % keyData!.count]
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)
var decryptedData = Data(capacity: data.count)
for (index, char) in data.enumerated() {
let decryptedChar = char ^ keyData![index % keyData!.count]
decryptedData.append(decryptedChar)
}
return String(data: decryptedData, encoding: .utf8) ?? ""
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let stringData = string.data(using: .utf8)
let keyData = key.data(using: .utf8)
var encryptedData = Data(count: stringData!.count)
for i in 0..<stringData!.count {
encryptedData.append(stringData![i] ^ keyData![i])
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)
var decryptedData = Data(count: data.count)
for i in 0..<data.count {
decryptedData.append(data[i] ^ keyData![i])
}
return String(data: decryptedData, encoding: .utf8) ?? ""
}
}
class Encryptor2: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let stringData = string.data(using: .utf8)
let keyData = key.data(using: .utf8)
var encryptedData = Data(count: stringData!.count)
for i in 0..<stringData!.count {
encryptedData.append(stringData![i] ^ keyData![i])
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)
var decryptedData = Data(count: data.count)
for i in 0..<data.count {
decryptedData.append(data[i] ^ keyData![i])
}
return String(data: decryptedData, encoding: .utf8) ?? ""
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let stringData = string.data(using: .utf8)
let keyData = key.data(using: .utf8)
var encryptedData = Data(count: stringData!.count)
for i in 0..<stringData!.count {
encryptedData.append(stringData![i] ^ keyData![i])
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)
var decryptedData = Data(count: data.count)
for i in 0..<data.count {
decryptedData.append(data[i] ^ keyData![i])
}
return String(data: decryptedData, encoding: .utf8) ?? ""
}
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor2: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let stringData = string.data(using: .utf8)
let keyData = key.data(using: .utf8)
var encryptedData = Data(count: stringData!.count)
for i in 0..<stringData!.count {
encryptedData.append(stringData![i] ^ keyData![i])
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)
var decryptedData = Data(count: data.count)
for i in 0..<data.count {
decryptedData.append(data[i] ^ keyData![i])
}
return String(data: decryptedData, encoding: .utf8) ?? ""
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let plainText = string.data(using: .utf8)!
let encryptedText = Data(bytes: plainText.withUnsafeBytes {
UnsafeBufferPointer(start: $0, count: plainText.count)
}
.map { $0 ^ key.hashValue })
return encryptedText
}
func decrypt(_ data: Data, _ key: String) -> String {
let decryptedText = Data(bytes: data.withUnsafeBytes {
UnsafeBufferPointer(start: $0, count: data.count)
}
.map { $0 ^ key.hashValue })
return String(data: decryptedText, encoding: .utf8)!
}
}
class Encrypter {
private let key: String
private let encryptor: EncryptorProtocol
init(key: String, encryptor: EncryptorProtocol) {
self.key = key
self.encryptor = encryptor
}
func encrypt(_ string: String) -> Data {
encryptor.encrypt(string, key)
}
func decrypt(_ data: Data) -> String {
encryptor.decrypt(data, key)
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let plainText = string.data(using: .utf8)!
let encryptedText = Data(bytes: plainText.withUnsafeBytes {
UnsafeBufferPointer(start: $0, count: plainText.count)
}
.map { $0 ^ key.hashValue })
return encryptedText
}
func decrypt(_ data: Data, _ key: String) -> String {
let decryptedText = Data(bytes: data.withUnsafeBytes {
UnsafeBufferPointer(start: $0, count: data.count)
}
.map { $0 ^ key.hashValue })
return String(data: decryptedText, encoding: .utf8)!
}
}
// Simple class that uses a key to encrypt and decrypt a string using the Encryptor class.
class Encrypter {
private let key: String
private let encryptor: EncryptorProtocol
init(key: String, encryptor: EncryptorProtocol) {
self.key = key
self.encryptor = encryptor
}
func encrypt(_ string: String) -> Data {
encryptor.encrypt(string, key)
}
func decrypt(_ data: Data) -> String {
encryptor.decrypt(data, key)
}
}
// Test the Encrypter class
let encrypter = Encrypter(key: "secret", encryptor: Encryptor())
let encryptedText = encrypter.encrypt("Hello, world!")
print("Encrypted text: \(encryptedText)")
let decryptedText = encrypter.decrypt(encryptedText)
print("Decrypted text: \(decryptedText)")
```let encryptedText = Data(bytes: plainText.withUnsafeBytes { // type of expression is ambiguous without a type annotationlet decryptedText = Data(bytes: data.withUnsafeBytes { // type of expression is ambiguous without a type annotationprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval }
requests = requests.filter { currentTime.timeIntervalSince($0) <= timeInterval }
requests.append(currentTime)
return requests.count <= maxRequests
}
}
class RateLimiter2: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval }
requests = requests.filter { currentTime.timeIntervalSince($0) <= timeInterval }
requests.append(currentTime)
return requests.count <= maxRequests
}
}
class RateLimiter3: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval }
requests = requests.filter { currentTime.timeIntervalSince($0) <= timeInterval }
requests.append(currentTime)
return requests.count <= maxRequests
}
}
class RateLimiter4: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval }
requests = requests.filter { currentTime.timeIntervalSince($0) <= timeInterval }
requests.append(currentTime)
return requests.count <= maxRequests
}
}
class RateLimiter5: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval }
requests = requests.filter { currentTime.timeIntervalSince($0) <= timeInterval }
requests.append(currentTime)
return requests.count <= maxRequests
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval }
requests = requests.filter { currentTime.timeIntervalSince($0) <= timeInterval }
requests.append(currentTime)
return requests.count <= maxRequests
}
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter2: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval }
requests = requests.filter { currentTime.timeIntervalSince($0) <= timeInterval }
requests.append(currentTime)
return requests.count <= maxRequests
}
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter3: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval }
requests = requests.filter { currentTime.timeIntervalSince($0) <= timeInterval }
requests.append(currentTime)
return requests.count <= maxRequests
}
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter4: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval }
requests = requests.filter { currentTime.timeIntervalSince($0) <= timeInterval }
requests.append(currentTime)
return requests.count <= maxRequests
}
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter5: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval }
requests = requests.filter { currentTime.timeIntervalSince($0) <= timeInterval }
requests.append(currentTime)
return requests.count <= maxRequests
}
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter6: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Dateinit(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval } // initialization of immutable value 'expiredRequests' was never used; consider replacing with assignment to '_' or removing itinit(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter2'let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval } // initialization of immutable value 'expiredRequests' was never used; consider replacing with assignment to '_' or removing itinit(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter3'let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval } // initialization of immutable value 'expiredRequests' was never used; consider replacing with assignment to '_' or removing itinit(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter4'let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval } // initialization of immutable value 'expiredRequests' was never used; consider replacing with assignment to '_' or removing itinit(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter5'let expiredRequests = requests.filter { currentTime.timeIntervalSince($0) > timeInterval } // initialization of immutable value 'expiredRequests' was never used; consider replacing with assignment to '_' or removing itThread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
// Initializes a new instance of the RateLimiter class with the specified maximum number of requests and time interval.
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
// Returns a boolean value indicating whether a new request can be made within the defined limits.
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { now.timeIntervalSince($0) > timeInterval }
requests = requests.filter { now.timeIntervalSince($0) <= timeInterval }
return requests.count < maxRequests
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
// Initializes a new instance of the RateLimiter class with the specified maximum number of requests and time interval.
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
// Returns a boolean value indicating whether a new request can be made within the defined limits.
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { now.timeIntervalSince($0) > timeInterval }
requests = requests.filter { now.timeIntervalSince($0) <= timeInterval }
return requests.count < maxRequests
}
}
// Example usage of the RateLimiter class.
let rateLimiter = RateLimiter(maxRequests: 10, timeInterval: 60.0)
for _ in 0..<20 {
if rateLimiter.allowRequest() {
print("Request allowed.")
} else {
print("Request denied.")
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'let expiredRequests = requests.filter { now.timeIntervalSince($0) > timeInterval } // initialization of immutable value 'expiredRequests' was never used; consider replacing with assignment to '_' or removing itThread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: TimeInterval = 0
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let elapsedTime = currentTime - lastRequestTime
if elapsedTime >= timeInterval {
requestCount = 0
lastRequestTime = currentTime
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: TimeInterval = 0
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let elapsedTime = currentTime - lastRequestTime
if elapsedTime >= timeInterval {
requestCount = 0
lastRequestTime = currentTime
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval = 0.0
// Initializes a rate limiter with the specified maximum number of requests and time interval.
// - Parameters:
// - maxRequests: The maximum number of requests allowed within the time interval.
// - timeInterval: The time interval in seconds within which requests are allowed.
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
// Determines if a new request can be made based on the rate limiting criteria.
// - Returns: A Boolean value indicating whether a new request can be made.
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let elapsedTime = currentTime - lastRequestTime
if elapsedTime < timeInterval {
let remainingRequests = maxRequests - Int(elapsedTime / timeInterval)
if remainingRequests <= 0 {
return false
}
}
lastRequestTime = currentTime
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval = 0.0
// Initializes a rate limiter with the specified maximum number of requests and time interval.
// - Parameters:
// - maxRequests: The maximum number of requests allowed within the time interval.
// - timeInterval: The time interval in seconds within which requests are allowed.
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
// Determines if a new request can be made based on the rate limiting criteria.
// - Returns: A Boolean value indicating whether a new request can be made.
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let elapsedTime = currentTime - lastRequestTime
if elapsedTime < timeInterval {
let remainingRequests = maxRequests - Int(elapsedTime / timeInterval)
if remainingRequests <= 0 {
return false
}
}
lastRequestTime = currentTime
return true
}
}
// Example usage:
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 60)
for _ in 1...10 {
if rateLimiter.allowRequest() {
print("Request allowed")
} else {
print("Request denied")
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime,
Date().timeIntervalSince(lastRequestTime) < timeInterval {
// Check if the time interval has elapsed since the last request
if requestCount < maxRequests {
// If the request count is within the limit, increment the request count and allow the request
requestCount += 1
return true
} else {
// If the request count is at the limit, deny the request
return false
}
} else {
// If the time interval has not elapsed since the last request, reset the request count and allow the request
requestCount = 1
self.lastRequestTime = Date()
return true
}
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime,
Date().timeIntervalSince(lastRequestTime) < timeInterval {
// Check if the time interval has elapsed since the last request
if requestCount < maxRequests {
// If the request count is within the limit, increment the request count and allow the request
requestCount += 1
return true
} else {
// If the request count is at the limit, deny the request
return false
}
} else {
// If the time interval has not elapsed since the last request, reset the request count and allow the request
requestCount = 1
self.lastRequestTime = Date()
return true
}
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
// Initializes a new instance of the RateLimiter with the specified maximum number of requests and time interval.
// - Parameters:
// - maxRequests: The maximum number of requests allowed within the time interval.
// - timeInterval: The time interval in seconds.
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
// Determines if a new request can be made within the defined limits.
// Returns true if a request can be made, false otherwise.
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { now.timeIntervalSince($0) > timeInterval }
requests = requests.filter { expiredRequests.contains($0) == false }
return requests.count < maxRequests
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
// Initializes a new instance of the RateLimiter with the specified maximum number of requests and time interval.
// - Parameters:
// - maxRequests: The maximum number of requests allowed within the time interval.
// - timeInterval: The time interval in seconds.
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
// Determines if a new request can be made within the defined limits.
// Returns true if a request can be made, false otherwise.
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { now.timeIntervalSince($0) > timeInterval }
requests = requests.filter { expiredRequests.contains($0) == false }
return requests.count < maxRequests
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
if currentTime - lastRequestTime >= timeInterval {
lastRequestTime = currentTime
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
if currentTime - lastRequestTime >= timeInterval {
lastRequestTime = currentTime
return true
}
return false
}
}
// Example usage:
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 10.0)
let allowed = rateLimiter.allowRequest()
print(allowed) // true
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertTrue failedprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
}
self.lastRequestTime = currentTime
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
}
self.lastRequestTime = currentTime
return true
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var currentRequests: Int = 0
private var lastRequestTime: TimeInterval = 0.0
// Initializes a RateLimiter object with the specified maximum number of requests and time interval.
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
// Determines if a new request can be made within the defined limits.
// Returns true if the request is allowed, false otherwise.
func allowRequest() -> Bool {
let currentTime = CFAbsoluteTimeGetCurrent()
let elapsedTime = currentTime - lastRequestTime
if elapsedTime >= timeInterval {
currentRequests = 0
lastRequestTime = currentTime
}
if currentRequests < maxRequests {
currentRequests += 1
return true
} else {
return false
}
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var currentRequests: Int = 0
private var lastRequestTime: TimeInterval = 0.0
// Initializes a RateLimiter object with the specified maximum number of requests and time interval.
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
// Determines if a new request can be made within the defined limits.
// Returns true if the request is allowed, false otherwise.
func allowRequest() -> Bool {
let currentTime = CFAbsoluteTimeGetCurrent()
let elapsedTime = currentTime - lastRequestTime
if elapsedTime >= timeInterval {
currentRequests = 0
lastRequestTime = currentTime
}
if currentRequests < maxRequests {
currentRequests += 1
return true
} else {
return false
}
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var currentRequestCount: Int = 0
private var lastRequestTime: TimeInterval = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let elapsedTime = currentTime - lastRequestTime
if elapsedTime > timeInterval {
currentRequestCount = 0
lastRequestTime = currentTime
}
if currentRequestCount < maxRequests {
currentRequestCount += 1
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var currentRequestCount: Int = 0
private var lastRequestTime: TimeInterval = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let elapsedTime = currentTime - lastRequestTime
if elapsedTime > timeInterval {
currentRequestCount = 0
lastRequestTime = currentTime
}
if currentRequestCount < maxRequests {
currentRequestCount += 1
return true
}
return false
}
}
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 10)
for _ in 1...10 {
if rateLimiter.allowRequest() {
print("Request allowed.")
} else {
print("Request denied.")
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
class ThreadSafeCounter2: ThreadSafeCounterProtocol {
private var counter: Int
private let readLock = NSRecursiveLock()
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
readLock.lock()
let result = counter
readLock.unlock()
return result
}
}
class ThreadSafeCounter3: ThreadSafeCounterProtocol {
private var counter: Int
private let rwLock = NSRecursiveLock()
init(value: Int) {
counter = value
}
func increment() {
rwLock.lock()
counter += 1
rwLock.unlock()
}
func currentValue() -> Int {
rwLock.lock()
let result = counter
rwLock.unlock()
return result
}
}
class ThreadSafeCounter4: ThreadSafeCounterProtocol {
private var counter: Int
private let readLock = NSLock()
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
readLock.lock()
let result = counter
readLock.unlock()
return result
}
}
class ThreadSafeCounter5: ThreadSafeCounterProtocol {
private var counter: Int
private let rwLock = NSLock()
init(value: Int) {
counter = value
}
func increment() {
rwLock.lock()
counter += 1
rwLock.unlock()
}
func currentValue() -> Int {
rwLock.lock()
let result = counter
rwLock.unlock()
return result
}
}
class ThreadSafeCounter6: ThreadSafeCounterProtocol {
private var counter: Int
private let readLock = NSRecursiveLock()
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
readLock.lock()
let result = counter
readLock.unlock()
return result
}
}
class ThreadSafeCounter7: ThreadSafeCounterProtocol {
private var counter: Int
private let rwLock = NSRecursiveLock()
init(value: Int) {
counter = value
}
func increment() {
rwLock.lock()
counter += 1
rwLock.unlock()
}
func currentValue() -> Int {
rwLock.lock()
let result = counter
rwLock.unlock()
return result
}
}
class ThreadSafeCounter8: ThreadSafeCounterProtocol {
private var counter: Int
private let readLock = NSLock()
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
readLock.lock()
let result = counter
readLock.unlock()
return result
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read operations.
class ThreadSafeCounter2: ThreadSafeCounterProtocol {
private var counter: Int
private let readLock = NSRecursiveLock()
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
readLock.lock()
let result = counter
readLock.unlock()
return result
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter3: ThreadSafeCounterProtocol {
private var counter: Int
private let rwLock = NSRecursiveLock()
init(value: Int) {
counter = value
}
func increment() {
rwLock.lock()
counter += 1
rwLock.unlock()
}
func currentValue() -> Int {
rwLock.lock()
let result = counter
rwLock.unlock()
return result
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read operations.
class ThreadSafeCounter4: ThreadSafeCounterProtocol {
private var counter: Int
private let readLock = NSLock()
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
readLock.lock()
let result = counter
readLock.unlock()
return result
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter5: ThreadSafeCounterProtocol {
private var counter: Int
private let rwLock = NSLock()
init(value: Int) {
counter = value
}
func increment() {
rwLock.lock()
counter += 1
rwLock.unlock()
}
func currentValue() -> Int {
rwLock.lock()
let result = counter
rwLock.unlock()
return result
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read operations.
class ThreadSafeCounter6: ThreadSafeCounterProtocol {
private var counter: Int
private let readLock = NSRecursiveLock()
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
readLock.lock()
let result = counter
readLock.unlock()
return result
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter7: ThreadSafeCounterProtocol {
private var counter: Int
private let rwLock = NSRecursiveLock()
init(value: Int) {
counter = value
}
func increment() {
rwLock.lock()
counter += 1
rwLock.unlock()
}
func currentValue() -> Int {
rwLock.lock()
let result = counter
rwLock.unlock()
return result
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read operations.
class ThreadSafeCounter8: ThreadSafeCounterProtocol {
private var counter: Int
private let readLock = NSLock()
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
readLock.lock()
let result = counter
readLock.unlock()
return result
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class Threadinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter2'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter3'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter4'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter5'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter6'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter7'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter8'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
// Using synchronized block to avoid race conditions
// while incrementing counter.
// This is not the best solution.
// It's just an example.
// In real project we should use a lock.
synchronized(self) {
self.value += 1
}
}
func currentValue() -> Int {
// Using synchronized block to avoid race conditions
// while reading counter value.
// This is not the best solution.
// It's just an example.
// In real project we should use a lock.
synchronized(self) {
return self.value
}
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
// Using synchronized block to avoid race conditions
// while incrementing counter.
// This is not the best solution.
// It's just an example.
// In real project we should use a lock.
synchronized(self) {
self.value += 1
}
}
func currentValue() -> Int {
// Using synchronized block to avoid race conditions
// while reading counter value.
// This is not the best solution.
// It's just an example.
// In real project we should use a lock.
synchronized(self) {
return self.value
}
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'synchronized(self) { // cannot find 'synchronized' in scopesynchronized(self) { // cannot find 'synchronized' in scopeprotocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
class ThreadSafeCounter2: ThreadSafeCounterProtocol {
private let lock = NSLock()
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
return value
}
}
class ThreadSafeCounter3: ThreadSafeCounterProtocol {
private let queue = DispatchQueue(label: "counterQueue")
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
queue.async {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int = 0
queue.sync {
currentValue = self.value
}
return currentValue
}
}
class ThreadSafeCounter4: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "counterQueue", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int = 0
queue.sync {
currentValue = self.value
}
return currentValue
}
}
class ThreadSafeCounter5: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "counterQueue", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int = 0
queue.sync {
currentValue = self.value
}
return currentValue
}
}
class ThreadSafeCounter6: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "counterQueue", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int = 0
queue.sync {
currentValue = self.value
}
return currentValue
}
}
class ThreadSafeCounter7: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "counterQueue", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int = 0
queue.sync {
currentValue = self.value
}
return currentValue
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Thread-safe counter with possibility to increment counter and access current value.
// Thread-safe for read operations, but not for write operations.
class ThreadSafeCounter2: ThreadSafeCounterProtocol {
private let lock = NSLock()
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
return value
}
}
// Thread-safe counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter3: ThreadSafeCounterProtocol {
private let queue = DispatchQueue(label: "counterQueue")
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
queue.async {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int = 0
queue.sync {
currentValue = self.value
}
return currentValue
}
}
// Thread-safe counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter4: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "counterQueue", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int = 0
queue.sync {
currentValue = self.value
}
return currentValue
}
}
// Thread-safe counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter5: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "counterQueue", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int = 0
queue.sync {
currentValue = self.value
}
return currentValue
}
}
// Thread-safe counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter6: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "counterQueue", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int = 0
queue.sync {
currentValue = self.value
}
return currentValue
}
}
// Thread-safe counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter7: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "counterQueue", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int = 0
queue.sync {
currentValue = self.value
}
return currentValue
}
}
// Thread-safe counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter8: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "counterinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter2'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter3'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter4'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter5'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter6'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter7'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
self.counter = value
}
// Thread-safe for read and write operations.
func increment() {
counter += 1
}
// Thread-safe for read operation.
func currentValue() -> Int {
return counter
}
}
func printCurrentCounterValue(counter: ThreadSafeCounterProtocol) {
print("Current counter value is: \(counter.currentValue())")
}
func incrementCounter(counter: ThreadSafeCounterProtocol) {
counter.increment()
}
func printCounterValueAfterIncrement(counter: ThreadSafeCounterProtocol) {
print("Current counter value is: \(counter.currentValue())")
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
self.counter = value
}
// Thread-safe for read and write operations.
func increment() {
counter += 1
}
// Thread-safe for read operation.
func currentValue() -> Int {
return counter
}
}
// Thread-safe for read operation.
func printCurrentCounterValue(counter: ThreadSafeCounterProtocol) {
print("Current counter value is: \(counter.currentValue())")
}
// Thread-safe for write operation.
func incrementCounter(counter: ThreadSafeCounterProtocol) {
counter.increment()
}
// Thread-safe for read operation.
func printCounterValueAfterIncrement(counter: ThreadSafeCounterProtocol) {
print("Current counter value is: \(counter.currentValue())")
}
let counter = ThreadSafeCounter(value: 0)
// Print current counter value.
printCurrentCounterValue(counter: counter)
// Increment counter.
incrementCounter(counter: counter)
// Print counter value after increment.
printCounterValueAfterIncrement(counter: counter)
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer {
lock.unlock()
}
value += 1
}
func currentValue() -> Int {
lock.lock()
defer {
lock.unlock()
}
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer {
lock.unlock()
}
value += 1
}
func currentValue() -> Int {
lock.lock()
defer {
lock.unlock()
}
return value
}
}
// Test
let counter = ThreadSafeCounter(value: 0)
DispatchQueue.concurrentPerform(iterations: 1000) { _ in
counter.increment()
}
print(counter.currentValue())
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
counter += 1
lock.unlock()
}
func currentValue() -> Int {
return lock.withLock {
return counter
}
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
counter += 1
lock.unlock()
}
func currentValue() -> Int {
return lock.withLock {
return counter
}
}
}
// Example of usage
let counter = ThreadSafeCounter(value: 0)
counter.increment()
counter.increment()
let value = counter.currentValue()
print(value) // 2
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
class ThreadSafeCounterRead: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
class ThreadSafeCounterWrite: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
class ThreadUnsafeCounter: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
class ThreadUnsafeCounter2: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
class ThreadUnsafeCounter3: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
class ThreadUnsafeCounter4: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
class ThreadUnsafeCounter5: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
class ThreadUnsafeCounter6: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
class ThreadUnsafeCounter7: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read operations.
class ThreadSafeCounterRead: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for write operations.
class ThreadSafeCounterWrite: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-unsafe for read and write operations.
class ThreadUnsafeCounter: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-unsafe for read and write operations.
class ThreadUnsafeCounter2: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-unsafe for read and write operations.
class ThreadUnsafeCounter3: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-unsafe for read and write operations.
class ThreadUnsafeCounter4: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-unsafe for read and write operations.
class ThreadUnsafeCounter5: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-unsafe for read and write operations.
class ThreadUnsafeCounter6: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-unsafe for read and write operations.
class ThreadUnsafeCounter7: ThreadSafeCounterProtocol {
private var counter: Int = 0
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-unsafe for read and write operations.
class ThreadUnsafeCounter8: ThreadSafeCounterinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterRead'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWrite'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadUnsafeCounter'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadUnsafeCounter2'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadUnsafeCounter3'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadUnsafeCounter4'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadUnsafeCounter5'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadUnsafeCounter6'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadUnsafeCounter7'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
class ThreadSafeCounterWithLock: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
init(value: Int) {
counter = value
}
func increment() {
lock.lock()
counter += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter
}
}
class ThreadSafeCounterWithSemaphore: ThreadSafeCounterProtocol {
private var counter: Int
private let semaphore = DispatchSemaphore(value: 1)
init(value: Int) {
counter = value
}
func increment() {
semaphore.wait()
counter += 1
semaphore.signal()
}
func currentValue() -> Int {
semaphore.wait()
defer { semaphore.signal() }
return counter
}
}
class ThreadSafeCounterWithMutex: ThreadSafeCounterProtocol {
private var counter: Int
private let mutex = pthread_mutex_t()
init(value: Int) {
counter = value
pthread_mutex_init(&mutex, nil)
}
deinit {
pthread_mutex_destroy(&mutex)
}
func increment() {
pthread_mutex_lock(&mutex)
counter += 1
pthread_mutex_unlock(&mutex)
}
func currentValue() -> Int {
pthread_mutex_lock(&mutex)
defer { pthread_mutex_unlock(&mutex) }
return counter
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
init(value: Int) {
counter = value
}
func increment() {
counter += 1
}
func currentValue() -> Int {
return counter
}
}
// Thread-safe counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
class ThreadSafeCounterWithLock: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
init(value: Int) {
counter = value
}
func increment() {
lock.lock()
counter += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter
}
}
// Thread-safe counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
// The counter is thread-safe because it uses the semaphore to protect the access to the counter.
class ThreadSafeCounterWithSemaphore: ThreadSafeCounterProtocol {
private var counter: Int
private let semaphore = DispatchSemaphore(value: 1)
init(value: Int) {
counter = value
}
func increment() {
semaphore.wait()
counter += 1
semaphore.signal()
}
func currentValue() -> Int {
semaphore.wait()
defer { semaphore.signal() }
return counter
}
}
// Thread-safe counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
// The counter is thread-safe because it uses the mutex to protect the access to the counter.
class ThreadSafeCounterWithMutex: ThreadSafeCounterProtocol {
private var counter: Int
private let mutex = pthread_mutex_t()
init(value: Int) {
counter = value
pthread_mutex_init(&mutex, nil)
}
deinit {
pthread_mutex_destroy(&mutex)
}
func increment() {
pthread_mutex_lock(&mutex)
counter += 1
pthread_mutex_unlock(&mutex)
}
func currentValue() -> Int {
pthread_mutex_lock(&mutex)
defer { pthread_mutex_unlock(&mutex) }
return counter
}
}
// Thread-safe counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// The counter is thread-safe because it uses the lock to protect the access to the counter.
// Theinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithLock'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithSemaphore'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithMutex'pthread_mutex_destroy(&mutex) // cannot pass immutable value as inout argument: 'mutex' is a 'let' constantpthread_mutex_lock(&mutex) // cannot pass immutable value as inout argument: 'mutex' is a 'let' constantpthread_mutex_unlock(&mutex) // cannot pass immutable value as inout argument: 'mutex' is a 'let' constantpthread_mutex_lock(&mutex) // cannot pass immutable value as inout argument: 'mutex' is a 'let' constantdefer { pthread_mutex_unlock(&mutex) } // cannot pass immutable value as inout argument: 'mutex' is a 'let' constantprotocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value += 1
semaphore.signal()
}
func currentValue() -> Int {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
let currentValue = value
semaphore.signal()
return currentValue
}
}
class ThreadSafeDecrementCounter: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value += 1
semaphore.signal()
}
func decrement() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value -= 1
semaphore.signal()
}
func currentValue() -> Int {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
let currentValue = value
semaphore.signal()
return currentValue
}
}
class ThreadSafeDecrementCounter2: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value += 1
semaphore.signal()
}
func decrement() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value -= 1
semaphore.signal()
}
func currentValue() -> Int {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
let currentValue = value
semaphore.signal()
return currentValue
}
}
class ThreadSafeDecrementCounter3: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value += 1
semaphore.signal()
}
func decrement() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value -= 1
semaphore.signal()
}
func currentValue() -> Int {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
let currentValue = value
semaphore.signal()
return currentValue
}
}
class ThreadSafeDecrementCounter4: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value += 1
semaphore.signal()
}
func decrement() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value -= 1
semaphore.signal()
}
func currentValue() -> Int {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
let currentValue = value
semaphore.signal()
return currentValue
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value += 1
semaphore.signal()
}
func currentValue() -> Int {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
let currentValue = value
semaphore.signal()
return currentValue
}
}
// Counter with additional method to decrement counter.
// Thread-safe for read and write operations.
class ThreadSafeDecrementCounter: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value += 1
semaphore.signal()
}
func decrement() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value -= 1
semaphore.signal()
}
func currentValue() -> Int {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
let currentValue = value
semaphore.signal()
return currentValue
}
}
// Counter with additional method to decrement counter.
// Thread-safe for read and write operations.
// Thread-safe for read and write operations.
class ThreadSafeDecrementCounter2: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value += 1
semaphore.signal()
}
func decrement() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value -= 1
semaphore.signal()
}
func currentValue() -> Int {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
let currentValue = value
semaphore.signal()
return currentValue
}
}
// Counter with additional method to decrement counter.
// Thread-safe for read and write operations.
// Thread-safe for read and write operations.
class ThreadSafeDecrementCounter3: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value += 1
semaphore.signal()
}
func decrement() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value -= 1
semaphore.signal()
}
func currentValue() -> Int {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
let currentValue = value
semaphore.signal()
return currentValue
}
}
// Counter with additional method to decrement counter.
// Thread-safe for read and write operations.
// Thread-safe for read and write operations.
class ThreadSafeDecrementCounter4: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value += 1
semaphore.signal()
}
func decrement() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value -= 1
semaphore.signal()
}
func currentValue() -> Int {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
let currentValue = value
semaphore.signal()
return currentValue
}
}
// Counter with additional method to decrement counter.
// Thread-safe for read and write operations.
// Thread-safe for read and write operations.
class ThreadSafeDecrementCounter5: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
value += 1
semaphore.signal()
}
func decrement() {
let semaphore = DispatchSemaphore(init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeDecrementCounter'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeDecrementCounter2'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeDecrementCounter3'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeDecrementCounter4'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
class ThreadSafeCounterUnsafe: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
class ThreadSafeCounterUnsafe2: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
class ThreadSafeCounterUnsafe3: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
class ThreadSafeCounterUnsafe4: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
class ThreadSafeCounterUnsafe5: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
class ThreadSafeCounterUnsafe6: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
class ThreadSafeCounterUnsafe7: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
class ThreadSafeCounterUnsafe8: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read operations.
// Unsafe for write operations.
class ThreadSafeCounterUnsafe: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
// Unsafe for write operations.
class ThreadSafeCounterUnsafe2: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
// Unsafe for write operations.
class ThreadSafeCounterUnsafe3: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
// Unsafe for write operations.
class ThreadSafeCounterUnsafe4: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
// Unsafe for write operations.
class ThreadSafeCounterUnsafe5: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
// Unsafe for write operations.
class ThreadSafeCounterUnsafe6: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
// Unsafe for write operations.
class ThreadSafeCounterUnsafe7: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
// Unsafe for write operations.
class ThreadSafeCounterUnsafe8: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
// Unsafe for write operations.
class ThreadSafeCounterUnsafe9: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value =init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterUnsafe'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterUnsafe2'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterUnsafe3'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterUnsafe4'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterUnsafe5'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterUnsafe6'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterUnsafe7'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterUnsafe8'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
var value: T
var transform: ((T) -> T)?
// Initialize the pipeline with an initial value
init(value: T) {
self.value = value
}
// Pipe the value through the pipeline by applying a transformation
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let newPipeline = Pipeline<U>(value: transform(value))
newPipeline.transform = self.transform
return newPipeline
}
// Execute the pipeline by applying all transformations in sequence
func execute() -> T {
var transformedValue = value
if let transform = transform {
transformedValue = transform(transformedValue)
}
return transformedValue
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
var value: T
var transform: ((T) -> T)?
// Initialize the pipeline with an initial value
init(value: T) {
self.value = value
}
// Pipe the value through the pipeline by applying a transformation
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let newPipeline = Pipeline<U>(value: transform(value))
newPipeline.transform = self.transform
return newPipeline
}
// Execute the pipeline by applying all transformations in sequence
func execute() -> T {
var transformedValue = value
if let transform = transform {
transformedValue = transform(transformedValue)
}
return transformedValue
}
}
// Example usage:
let pipeline = Pipeline(value: 10)
.pipe { $0 + 5 }
.pipe { $0 * 2 }
.pipe { $0 - 10 }
.execute()
print(pipeline) // Output: 15
```init(value: T) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<T>'newPipeline.transform = self.transform // cannot assign value of type '((T) -> T)?' to type '((U) -> U)?'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
// The initial value that starts the pipeline.
private let value: T
// Initialize the pipeline with an initial value.
init(value: T) {
self.value = value
}
// Apply a transformation to the current value and return a new pipeline with the transformed value.
// The transformation function is passed as a closure.
// This function is generic, allowing for type changes in the pipeline.
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
// Execute the pipeline and return the final value after applying all transformations.
// This function is generic, allowing for type changes in the pipeline.
func execute() -> T {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
// The initial value that starts the pipeline.
private let value: T
// Initialize the pipeline with an initial value.
init(value: T) {
self.value = value
}
// Apply a transformation to the current value and return a new pipeline with the transformed value.
// The transformation function is passed as a closure.
// This function is generic, allowing for type changes in the pipeline.
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
// Execute the pipeline and return the final value after applying all transformations.
// This function is generic, allowing for type changes in the pipeline.
func execute() -> T {
return value
}
}
// Example usage:
let pipeline = Pipeline(value: 10)
.pipe { $0 + 5 }
.pipe { $0 * 2 }
.pipe { $0 / 2 }
.pipe { $0 - 1 }
.execute()
print(pipeline) // Output: 12
```init(value: T) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<T>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output> : PipelineProtocol {
var value: Output
init(value: Output) {
self.value = value
}
// Apply a transformation to the current output, creating a new pipeline with the transformed output.
// The transformation function is passed as a closure that takes the current output as input and returns the transformed output.
// The resulting pipeline can be chained with more transformations by calling the pipe() method.
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
// Execute the pipeline by returning the final output value.
func execute() -> Output {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output> : PipelineProtocol {
var value: Output
init(value: Output) {
self.value = value
}
// Apply a transformation to the current output, creating a new pipeline with the transformed output.
// The transformation function is passed as a closure that takes the current output as input and returns the transformed output.
// The resulting pipeline can be chained with more transformations by calling the pipe() method.
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
// Execute the pipeline by returning the final output value.
func execute() -> Output {
return value
}
}
// Example usage of the pipeline:
let pipeline = Pipeline(value: 10)
.pipe({ $0 + 5 })
.pipe({ $0 * 2 })
.pipe({ $0 / 3 })
.pipe({ $0 - 1 })
.execute()
print(pipeline) // Output: 14
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let next = Pipeline<U>(value: transform(value))
return next
}
func execute() -> T {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let next = Pipeline<U>(value: transform(value))
return next
}
func execute() -> T {
return value
}
}
// Usage example
let pipeline = Pipeline<Int>(value: 10)
.pipe { $0 + 5 }
.pipe { $0 * 2 }
.pipe { String(describing: $0) }
.pipe { $0.uppercased() }
.execute()
print(pipeline) // Output: "25"
```init(value: T) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<T>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
// The initial value for the pipeline
var value: T
// Initialize the pipeline with the given value
init(value: T) {
self.value = value
}
// Apply a transformation to the pipeline's value and return a new pipeline with the transformed value
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let newValue = transform(value)
return Pipeline<U>(value: newValue)
}
// Execute the pipeline by returning the final value
func execute() -> T {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
// The initial value for the pipeline
var value: T
// Initialize the pipeline with the given value
init(value: T) {
self.value = value
}
// Apply a transformation to the pipeline's value and return a new pipeline with the transformed value
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let newValue = transform(value)
return Pipeline<U>(value: newValue)
}
// Execute the pipeline by returning the final value
func execute() -> T {
return value
}
}
// Example usage of the pipeline
let initialValue = 10
let pipeline = Pipeline(value: initialValue)
.pipe { $0 * 2 }
.pipe { $0 + 5 }
.pipe { $0 - 3 }
.execute()
print(pipeline) // Output: 22
```init(value: T) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<T>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transformations: [(Output) -> Output] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let newPipeline = Pipeline<U>(value: transform(value) as! U)
transformations.append(transform as! (Output) -> Output)
return newPipeline
}
func execute() -> Output {
var result = value
for transform in transformations {
result = transform(result)
}
return result
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transformations: [(Output) -> Output] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let newPipeline = Pipeline<U>(value: transform(value) as! U)
transformations.append(transform as! (Output) -> Output)
return newPipeline
}
func execute() -> Output {
var result = value
for transform in transformations {
result = transform(result)
}
return result
}
}
// Example usage
let pipeline = Pipeline<Int>(value: 10)
.pipe { $0 + 5 }
.pipe { $0 * 2 }
.pipe { String(describing: $0) }
.pipe { $0.count }
.execute()
print(pipeline) // Output: 10
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'let newPipeline = Pipeline<U>(value: transform(value) as! U) // forced cast of 'U' to same type has no effectprotocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
var value: T
// Initialize with an initial value.
required init(value: T) {
self.value = value
}
// Chain a transformation to the pipeline, returning a new pipeline with the updated value.
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let newPipeline = Pipeline<U>(value: transform(value))
return newPipeline
}
// Execute the pipeline and return the final value.
func execute() -> T {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
var value: T
// Initialize with an initial value.
required init(value: T) {
self.value = value
}
// Chain a transformation to the pipeline, returning a new pipeline with the updated value.
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let newPipeline = Pipeline<U>(value: transform(value))
return newPipeline
}
// Execute the pipeline and return the final value.
func execute() -> T {
return value
}
}
// Example usage:
let initialValue = 10
let pipeline = Pipeline(value: initialValue)
.pipe { $0 * 2 }
.pipe { $0 + 5 }
.pipe { $0 / 3 }
.pipe { $0 - 10 }
.execute()
print(pipeline) // Output: 3.3333333333333335
```protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private let value: Output
private var transform: ((Output) -> Output)?
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let newPipeline = Pipeline<U>(value: transform(value))
newPipeline.transform = self.transform.map { $0 >>> transform }
return newPipeline
}
func execute() -> Output {
return transform?(value) ?? value
}
}
func transformString(_ input: String) -> (Int, Int) {
let numbers = input.split(separator: ",").map { Int($0) ?? 0 }
return (numbers[0], numbers[1])
}
func transformTuple(_ input: (Int, Int)) -> String {
return "\(input.0) \(input.1)"
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private let value: Output
private var transform: ((Output) -> Output)?
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let newPipeline = Pipeline<U>(value: transform(value))
newPipeline.transform = self.transform.map { $0 >>> transform }
return newPipeline
}
func execute() -> Output {
return transform?(value) ?? value
}
}
// A function that takes a string and returns a tuple of integers
func transformString(_ input: String) -> (Int, Int) {
let numbers = input.split(separator: ",").map { Int($0) ?? 0 }
return (numbers[0], numbers[1])
}
// A function that takes a tuple of integers and returns a string
func transformTuple(_ input: (Int, Int)) -> String {
return "\(input.0) \(input.1)"
}
// Create an initial pipeline with a string value
let initialValue = Pipeline<String>(value: "1,2")
// Chain the transformations
let result = initialValue
.pipe(transformString)
.pipe(transformTuple)
.execute()
print(result) // Output: "1 2"
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'newPipeline.transform = self.transform.map { $0 >>> transform } // cannot find operator '>>>' in scopeprotocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
// Initialize the pipeline with an initial value.
init(value: Output) {
self.value = value
}
// Apply a transformation to the pipeline's current value and return a new pipeline with the transformed value.
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let newValue = transform(value)
return Pipeline(value: newValue)
}
// Execute the pipeline, returning the final value after applying all transformations.
func execute() -> Output {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
// Initialize the pipeline with an initial value.
init(value: Output) {
self.value = value
}
// Apply a transformation to the pipeline's current value and return a new pipeline with the transformed value.
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let newValue = transform(value)
return Pipeline(value: newValue)
}
// Execute the pipeline, returning the final value after applying all transformations.
func execute() -> Output {
return value
}
}
// Example usage:
let initialValue = 10
let pipeline = Pipeline(value: initialValue)
.pipe { $0 + 5 }
.pipe { $0 * 2 }
.pipe { $0 - 10 }
.execute()
print(pipeline) // Output: 25
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'return Pipeline(value: newValue) // cannot convert return expression of type 'Pipeline<Output>' to return type 'Pipeline<U>'return Pipeline(value: newValue) // cannot convert value of type 'U' to expected argument type 'Output'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
private var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
private var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Usage example
let pipeline = Pipeline(value: 1)
.pipe { $0 + 2 }
.pipe { $0 * 3 }
.pipe { String(describing: $0) }
.execute()
print(pipeline) // Output: 9
```init(value: T) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<T>'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
private var observers = [UUID: (Value) -> Void]()
// Create a new observable property with the given value.
required init(value: Value) {
self.value = value
}
// Subscribe to changes in the property value.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
// Unsubscribe from changes in the property value.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
class ComputedProperty<Value> : ObservablePropertyProtocol {
var value: Value {
return valueGetter()
}
private let valueGetter: () -> Value
required init(value: @escaping () -> Value) {
self.valueGetter = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return ObservableProperty<Value>(value: value).subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
return ObservableProperty<Value>(value: value).unsubscribe(observer)
}
}
class MutableProperty<Value> : ObservablePropertyProtocol {
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
private var observers = [UUID: (Value) -> Void]()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
class Property<Value> : ObservablePropertyProtocol {
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
private var observers = [UUID: (Value) -> Void]()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
class PrivateProperty<Value> : ObservablePropertyProtocol {
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
private var observers = [UUID: (Value) -> Void]()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
class PrivateComputedProperty<Value> : ObservablePropertyProtocol {
var value: Value {
return valueGetter()
}
private let valueGetter: () -> Value
required init(value: @escaping () -> Value) {
self.valueGetter = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return PrivateProperty<Value>(value: value).subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
return PrivateProperty<Value>(value: value).unsubscribe(observer)
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
private var observers = [UUID: (Value) -> Void]()
// Create a new observable property with the given value.
required init(value: Value) {
self.value = value
}
// Subscribe to changes in the property value.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
// Unsubscribe from changes in the property value.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A property that can only be read and not written.
class ComputedProperty<Value> : ObservablePropertyProtocol {
var value: Value {
return valueGetter()
}
private let valueGetter: () -> Value
required init(value: @escaping () -> Value) {
self.valueGetter = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return ObservableProperty<Value>(value: value).subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
return ObservableProperty<Value>(value: value).unsubscribe(observer)
}
}
// A property that can only be written and not read.
class MutableProperty<Value> : ObservablePropertyProtocol {
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
private var observers = [UUID: (Value) -> Void]()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A property that can be read and written.
class Property<Value> : ObservablePropertyProtocol {
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
private var observers = [UUID: (Value) -> Void]()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A property that can be read and written, but only by a specific object.
class PrivateProperty<Value> : ObservablePropertyProtocol {
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
private var observers = [UUID: (Value) -> Void]()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A property that can be read and written, but only by a specific object.
class PrivateComputedProperty<Value> : ObservablePropertyProtocol {
var value: Value {
return valueGetter()
}
private let valueGetter: () -> Value
required init(value: @escaping () -> Value) {
self.valueGetter = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return PrivateProperty<Value>(value: value).subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
return PrivateProperty<Value>(value: value).unsubscribe(observer)
}
}
// A property that can be read and written, but only by a specific object.
class PrivateMutableProperty<Value> : ObservablePropertyProtocol {
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
private var observers = [UUID: (Value) -> Void]()
required init(value: Value)class ComputedProperty<Value> : ObservablePropertyProtocol { // type 'ComputedProperty<Value>' does not conform to protocol 'ObservablePropertyProtocol'class PrivateComputedProperty<Value> : ObservablePropertyProtocol { // type 'PrivateComputedProperty<Value>' does not conform to protocol 'ObservablePropertyProtocol'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers that are observing the property.
private var observers = [UUID: (Value) -> Void]()
// Initializes the observable property with the given value.
required init(value: Value) {
self.value = value
}
// Subscribes an observer to the property.
// Returns the UUID of the observer.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
// Unsubscribes an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
class ObservableObject {
private var observables = [UUID: ObservablePropertyProtocol]()
// Creates an observable property with the given value.
// Returns the UUID of the property.
func observable<T>(_ value: T) -> UUID {
let observable = ObservableProperty(value: value)
let uuid = UUID()
observables[uuid] = observable
return uuid
}
// Returns the observable property with the given UUID.
func observable(_ uuid: UUID) -> ObservablePropertyProtocol? {
return observables[uuid]
}
}
class ObservableObject2 {
private var observables = [UUID: ObservablePropertyProtocol]()
// Creates an observable property with the given value.
// Returns the UUID of the property.
func observable<T>(_ value: T) -> UUID {
let observable = ObservableProperty(value: value)
let uuid = UUID()
observables[uuid] = observable
return uuid
}
// Returns the observable property with the given UUID.
func observable(_ uuid: UUID) -> ObservablePropertyProtocol? {
return observables[uuid]
}
}
class ObservableObject3 {
private var observables = [UUID: ObservablePropertyProtocol]()
// Creates an observable property with the given value.
// Returns the UUID of the property.
func observable<T>(_ value: T) -> UUID {
let observable = ObservableProperty(value: value)
let uuid = UUID()
observables[uuid] = observable
return uuid
}
// Returns the observable property with the given UUID.
func observable(_ uuid: UUID) -> ObservablePropertyProtocol? {
return observables[uuid]
}
}
class ObservableObject4 {
private var observables = [UUID: ObservablePropertyProtocol]()
// Creates an observable property with the given value.
// Returns the UUID of the property.
func observable<T>(_ value: T) -> UUID {
let observable = ObservableProperty(value: value)
let uuid = UUID()
observables[uuid] = observable
return uuid
}
// Returns the observable property with the given UUID.
func observable(_ uuid: UUID) -> ObservablePropertyProtocol? {
return observables[uuid]
}
}
class ObservableObject5 {
private var observables = [UUID: ObservablePropertyProtocol]()
// Creates an observable property with the given value.
// Returns the UUID of the property.
func observable<T>(_ value: T) -> UUID {
let observable = ObservableProperty(value: value)
let uuid = UUID()
observables[uuid] = observable
return uuid
}
// Returns the observable property with the given UUID.
func observable(_ uuid: UUID) -> ObservablePropertyProtocol? {
return observables[uuid]
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers that are observing the property.
private var observers = [UUID: (Value) -> Void]()
// Initializes the observable property with the given value.
required init(value: Value) {
self.value = value
}
// Subscribes an observer to the property.
// Returns the UUID of the observer.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
// Unsubscribes an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A class that has observable properties.
class ObservableObject {
private var observables = [UUID: ObservablePropertyProtocol]()
// Creates an observable property with the given value.
// Returns the UUID of the property.
func observable<T>(_ value: T) -> UUID {
let observable = ObservableProperty(value: value)
let uuid = UUID()
observables[uuid] = observable
return uuid
}
// Returns the observable property with the given UUID.
func observable(_ uuid: UUID) -> ObservablePropertyProtocol? {
return observables[uuid]
}
}
// A class that has observable properties.
class ObservableObject2 {
private var observables = [UUID: ObservablePropertyProtocol]()
// Creates an observable property with the given value.
// Returns the UUID of the property.
func observable<T>(_ value: T) -> UUID {
let observable = ObservableProperty(value: value)
let uuid = UUID()
observables[uuid] = observable
return uuid
}
// Returns the observable property with the given UUID.
func observable(_ uuid: UUID) -> ObservablePropertyProtocol? {
return observables[uuid]
}
}
// A class that has observable properties.
class ObservableObject3 {
private var observables = [UUID: ObservablePropertyProtocol]()
// Creates an observable property with the given value.
// Returns the UUID of the property.
func observable<T>(_ value: T) -> UUID {
let observable = ObservableProperty(value: value)
let uuid = UUID()
observables[uuid] = observable
return uuid
}
// Returns the observable property with the given UUID.
func observable(_ uuid: UUID) -> ObservablePropertyProtocol? {
return observables[uuid]
}
}
// A class that has observable properties.
class ObservableObject4 {
private var observables = [UUID: ObservablePropertyProtocol]()
// Creates an observable property with the given value.
// Returns the UUID of the property.
func observable<T>(_ value: T) -> UUID {
let observable = ObservableProperty(value: value)
let uuid = UUID()
observables[uuid] = observable
return uuid
}
// Returns the observable property with the given UUID.
func observable(_ uuid: UUID) -> ObservablePropertyProtocol? {
return observables[uuid]
}
}
// A class that has observable properties.
class ObservableObject5 {
private var observables = [UUID: ObservablePropertyProtocol]()
// Creates an observable property with the given value.
// Returns the UUID of the property.
func observable<T>(_ value: T) -> UUID {
let observable = ObservableProperty(value: value)
let uuid = UUID()
observables[uuid] = observable
return uuid
}
// Returns the observable property with the given UUID.
func observable(_ uuid: UUID) -> ObservablePropertyProtocol? {
return observables[uuid]
}
}
// A class that has observable properties.
class ObservableObject6 {
private var observables = [UUID: ObservablePropertyProtocol]()
// Creates an observable property with the given value.
// Returns the UUID of the property.
func observable<T>(_ value: T) -> UUID {
let observable = ObservableProperty(value: value)
let uuid = UUID()
observables[uuid] = observable
return uuid
}
// Returns the observable property with the given UUID.
func observable(_ uuid: UUID) -> ObservablePropertyProtocol? {
private var observables = [UUID: ObservablePropertyProtocol]() // use of protocol 'ObservablePropertyProtocol' as a type must be written 'any ObservablePropertyProtocol'func observable(_ uuid: UUID) -> ObservablePropertyProtocol? { // use of protocol 'ObservablePropertyProtocol' as a type must be written 'any ObservablePropertyProtocol'private var observables = [UUID: ObservablePropertyProtocol]() // use of protocol 'ObservablePropertyProtocol' as a type must be written 'any ObservablePropertyProtocol'func observable(_ uuid: UUID) -> ObservablePropertyProtocol? { // use of protocol 'ObservablePropertyProtocol' as a type must be written 'any ObservablePropertyProtocol'private var observables = [UUID: ObservablePropertyProtocol]() // use of protocol 'ObservablePropertyProtocol' as a type must be written 'any ObservablePropertyProtocol'func observable(_ uuid: UUID) -> ObservablePropertyProtocol? { // use of protocol 'ObservablePropertyProtocol' as a type must be written 'any ObservablePropertyProtocol'private var observables = [UUID: ObservablePropertyProtocol]() // use of protocol 'ObservablePropertyProtocol' as a type must be written 'any ObservablePropertyProtocol'func observable(_ uuid: UUID) -> ObservablePropertyProtocol? { // use of protocol 'ObservablePropertyProtocol' as a type must be written 'any ObservablePropertyProtocol'private var observables = [UUID: ObservablePropertyProtocol]() // use of protocol 'ObservablePropertyProtocol' as a type must be written 'any ObservablePropertyProtocol'func observable(_ uuid: UUID) -> ObservablePropertyProtocol? { // use of protocol 'ObservablePropertyProtocol' as a type must be written 'any ObservablePropertyProtocol'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(_ value: Value) {
self.value = value
observers.forEach { $0.value(value) }
}
}
class ObservableProperty<Value: Equatable> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(_ value: Value) {
if value != self.value {
self.value = value
observers.forEach { $0.value(value) }
}
}
}
class ObservableProperty<Value: Comparable> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
private let threshold: Value
required init(value: Value, threshold: Value) {
self.value = value
self.threshold = threshold
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(_ value: Value) {
if abs(value - self.value) > threshold {
self.value = value
observers.forEach { $0.value(value) }
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(_ value: Value) {
self.value = value
observers.forEach { $0.value(value) }
}
}
// A property that notifies observers of value changes only when the value changes.
class ObservableProperty<Value: Equatable> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(_ value: Value) {
if value != self.value {
self.value = value
observers.forEach { $0.value(value) }
}
}
}
// A property that notifies observers of value changes only when the value changes and only when the value changes by a certain amount.
class ObservableProperty<Value: Comparable> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
private let threshold: Value
required init(value: Value, threshold: Value) {
self.value = value
self.threshold = threshold
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(_ value: Value) {
if abs(value - self.value) > threshold {
self.value = value
observers.forEach { $0.value(value) }
}
}
}
// A property that notifies observers of value changes only when the value changes and only when the value changes by a certain amount.
class ObservableProperty<Value: Comparable> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
private let threshold: Value
required init(value: Value, threshold: Value) {
self.value = value
self.threshold = threshold
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(_ value: Value) {
if abs(value - self.value) > threshold {
self.value = value
observers.forEach { $0.value(value) }
}
}
}
// A property that notifies observers of value changes only when the value changes and only when the value changes by a certain amount.
class ObservableProperty<Value: Comparable> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
private let threshold: Value
required init(value: Value, threshold: Value) {
self.value = value
self.threshold = threshold
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(_private(set) var value: Value // setter for property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'class ObservableProperty<Value: Equatable> : ObservablePropertyProtocol { // invalid redeclaration of 'ObservableProperty'private(set) var value: Value // setter for property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'class ObservableProperty<Value: Comparable> : ObservablePropertyProtocol { // type 'ObservableProperty<Value>' does not conform to protocol 'ObservablePropertyProtocol'class ObservableProperty<Value: Comparable> : ObservablePropertyProtocol { // invalid redeclaration of 'ObservableProperty'private(set) var value: Value // setter for property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'if abs(value - self.value) > threshold { // referencing operator function '-' on 'Strideable' requires that 'Value' conform to '_Pointer'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
var value: Value
private var observers: [UUID: (Value) -> Void] = [:]
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
observers.forEach { $0.value(value) }
}
}
protocol ObservablePropertyContainer {
associatedtype Value
var value: Value { get }
}
class ObservablePropertyContainer<Value> : ObservablePropertyProtocol, ObservablePropertyContainer {
var value: Value
private var observers: [UUID: (Value) -> Void] = [:]
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
observers.forEach { $0.value(value) }
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
var value: Value
private var observers: [UUID: (Value) -> Void] = [:]
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
observers.forEach { $0.value(value) }
}
}
protocol ObservablePropertyContainer {
associatedtype Value
var value: Value { get }
}
// A container that can be observed for changes to its value.
class ObservablePropertyContainer<Value> : ObservablePropertyProtocol, ObservablePropertyContainer {
var value: Value
private var observers: [UUID: (Value) -> Void] = [:]
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
observers.forEach { $0.value(value) }
}
}
// A container that can be observed for changes to its value.
class ObservablePropertyContainer<Value> : ObservablePropertyProtocol, ObservablePropertyContainer {
var value: Value
private var observers: [UUID: (Value) -> Void] = [:]
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
observers.forEach { $0.value(value) }
}
}
// A container that can be observed for changes to its value.
class ObservablePropertyContainer<Value> : ObservablePropertyProtocol, ObservablePropertyContainer {
var value: Value
private var observers: [UUID: (Value) -> Void] = [:]
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
observers.forEach { $0.value(value) }
}
}
// A container that can be observed for changes to its value.
class ObservablePropertyContainer<Value> : ObservablePropertyProtocol, ObservablePropertyContainer {
var value: Value
private var observers: [UUID: (Value) -> Void] = [:]
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
observers.forEach { $0.value(value) }
}
}
// A container that can be observed for changes to its value.
class ObservablePropertyContainer<Value> : ObservablePropertyProtocol, ObservablePropertyContainer {
var value: Value
private var observers: [UUID: (Value) -> Void] = [:]
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
observers.forEach { $0.value(value) }
}
}
// A container that can be observed for changes to its value.
class ObservablePropertyContainer<Value> : ObservablePropertyProtocol, ObservablePropertyContainer {
var value: Value
private var observers: [UUID: (Value) -> Void] = [:]
init(value: Value) {
self.init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'class ObservablePropertyContainer<Value> : ObservablePropertyProtocol, ObservablePropertyContainer { // invalid redeclaration of 'ObservablePropertyContainer'class ObservablePropertyContainer<Value> : ObservablePropertyProtocol, ObservablePropertyContainer { // 'ObservablePropertyContainer' is ambiguous for type lookup in this contextinit(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservablePropertyContainer<Value>'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
var value: Value {
didSet {
for observer in observers {
observer(value)
}
}
}
private var observers = [UUID: (Value) -> Void]()
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
class ObservableArrayProperty<Value> : ObservablePropertyProtocol {
typealias Value = [Value]
var value: [Value] {
didSet {
for observer in observers {
observer(value)
}
}
}
private var observers = [UUID: ([Value]) -> Void]()
init(value: [Value]) {
self.value = value
}
func subscribe(_ observer: @escaping ([Value]) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
class ObservableDictionaryProperty<Key: Hashable, Value> : ObservablePropertyProtocol {
typealias Value = [Key: Value]
var value: [Key: Value] {
didSet {
for observer in observers {
observer(value)
}
}
}
private var observers = [UUID: ([Key: Value]) -> Void]()
init(value: [Key: Value]) {
self.value = value
}
func subscribe(_ observer: @escaping ([Key: Value]) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
class ObservableSetProperty<Value> : ObservablePropertyProtocol {
typealias Value = Set<Value>
var value: Set<Value> {
didSet {
for observer in observers {
observer(value)
}
}
}
private var observers = [UUID: (Set<Value>) -> Void]()
init(value: Set<Value>) {
self.value = value
}
func subscribe(_ observer: @escaping (Set<Value>) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
class ObservableTupleProperty<Value> : ObservablePropertyProtocol {
typealias Value = (Value)
var value: (Value) {
didSet {
for observer in observers {
observer(value)
}
}
}
private var observers = [UUID: ((Value)) -> Void]()
init(value: (Value)) {
self.value = value
}
func subscribe(_ observer: @escaping ((Value)) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
var value: Value {
didSet {
for observer in observers {
observer(value)
}
}
}
private var observers = [UUID: (Value) -> Void]()
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// Generic observable property that notifies observers of value changes.
class ObservableArrayProperty<Value> : ObservablePropertyProtocol {
typealias Value = [Value]
var value: [Value] {
didSet {
for observer in observers {
observer(value)
}
}
}
private var observers = [UUID: ([Value]) -> Void]()
init(value: [Value]) {
self.value = value
}
func subscribe(_ observer: @escaping ([Value]) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// Generic observable property that notifies observers of value changes.
class ObservableDictionaryProperty<Key: Hashable, Value> : ObservablePropertyProtocol {
typealias Value = [Key: Value]
var value: [Key: Value] {
didSet {
for observer in observers {
observer(value)
}
}
}
private var observers = [UUID: ([Key: Value]) -> Void]()
init(value: [Key: Value]) {
self.value = value
}
func subscribe(_ observer: @escaping ([Key: Value]) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// Generic observable property that notifies observers of value changes.
class ObservableSetProperty<Value> : ObservablePropertyProtocol {
typealias Value = Set<Value>
var value: Set<Value> {
didSet {
for observer in observers {
observer(value)
}
}
}
private var observers = [UUID: (Set<Value>) -> Void]()
init(value: Set<Value>) {
self.value = value
}
func subscribe(_ observer: @escaping (Set<Value>) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// Generic observable property that notifies observers of value changes.
class ObservableTupleProperty<Value> : ObservablePropertyProtocol {
typealias Value = (Value)
var value: (Value) {
didSet {
for observer in observers {
observer(value)
}
}
}
private var observers = [UUID: ((Value)) -> Void]()
init(value: (Value)) {
self.value = value
}
func subscribe(_ observer: @escaping ((Value)) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// Generic observable property that notifies observers of value changes.
class ObservableTuple2Property<Value1, Value2> : ObservablePropertyProtocol {
typealias Value = (Value1, Value2)
var value: (Value1, Value2) {
didSet {
for observer in observers {
observer(value)
}
}
}
private var observers = [UUID: ((Value1, Value2)) -> Void]()
init(value: (Value1, Value2)) {
self.value = value
}
func subscribe(_ observer: @escaping ((Value1, Value2)) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nilobserver(value) // cannot call value of non-function type '(key: UUID, value: (Value) -> Void)'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'observer(value) // cannot call value of non-function type '(key: UUID, value: ([Value]) -> Void)'init(value: [Value]) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableArrayProperty<Value>'observer(value) // cannot call value of non-function type '(key: UUID, value: ([Key : Value]) -> Void)'init(value: [Key: Value]) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableDictionaryProperty<Key, Value>'class ObservableSetProperty<Value> : ObservablePropertyProtocol { // type 'ObservableSetProperty<Value>' does not conform to protocol 'ObservablePropertyProtocol'typealias Value = Set<Value> // type 'Value' does not conform to protocol 'Hashable'var value: Set<Value> { // type 'Value' does not conform to protocol 'Hashable'private var observers = [UUID: (Set<Value>) -> Void]() // type 'Value' does not conform to protocol 'Hashable'init(value: Set<Value>) { // type 'Value' does not conform to protocol 'Hashable'func subscribe(_ observer: @escaping (Set<Value>) -> Void) -> UUID { // type 'Value' does not conform to protocol 'Hashable'observers[observer] = nil // 'nil' requires a contextual typeobserver(value) // cannot call value of non-function type '(key: UUID, value: ((Value)) -> Void)'init(value: (Value)) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableTupleProperty<Value>'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
var value: Value
private var observers = [UUID: (Value) -> Void]()
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
class ObservableDistinctProperty<Value: Equatable> : ObservablePropertyProtocol {
var value: Value
private var observers = [UUID: (Value) -> Void]()
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
var value: Value
private var observers = [UUID: (Value) -> Void]()
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
// A property that notifies observers of value changes only if the new value is different from the old value.
class ObservableDistinctProperty<Value: Equatable> : ObservablePropertyProtocol {
var value: Value
private var observers = [UUID: (Value) -> Void]()
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
// A property that notifies observers of value changes only if the new value is different from the old value.
class ObservableDistinctProperty<Value: Equatable> : ObservablePropertyProtocol {
var value: Value
private var observers = [UUID: (Value) -> Void]()
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
// A property that notifies observers of value changes only if the new value is different from the old value.
class ObservableDistinctProperty<Value: Equatable> : ObservablePropertyProtocol {
var value: Value
private var observers = [UUID: (Value) -> Void]()
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
// A property that notifies observers of value changes only if the new value is different from the old value.
class ObservableDistinctProperty<Value: Equatable> : ObservablePropertyProtocol {
var value: Value
private var observers = [UUID: (Value) -> Void]()
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
// A property that notifies observers of value changes only if the new value is different from the old value.
class ObservableDistinctProperty<Value: Equatable> : ObservablePropertyProtocol {
var value: Value
private var observers = [UUID: (Value) -> Void]()
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
// A property that notifies observers of value changes only if the new value is different from the old value.
class ObservableDistinctProperty<Value: Equatable> : ObservablePropertyProtocol {
var value:init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableDistinctProperty<Value>'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers of the property.
private var observers: [UUID: (Value) -> Void] = [:]
// Create a new observable property with the given initial value.
required init(value: Value) {
self.value = value
}
// Add an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
// Remove an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
class Property<Value> {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers of the property.
private var observers: [(Value) -> Void] = []
// Create a new property with the given initial value.
init(value: Value) {
self.value = value
}
// Add an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) {
observers.append(observer)
observer(value)
}
// Remove an observer from the property.
func unsubscribe(_ observer: @escaping (Value) -> Void) {
observers = observers.filter { $0 != observer }
}
}
class Property2<Value> {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers of the property.
private var observers: [UUID: (Value) -> Void] = [:]
// Create a new property with the given initial value.
init(value: Value) {
self.value = value
}
// Add an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
// Remove an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
class Property3<Value> {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers of the property.
private var observers: [UUID: (Value) -> Void] = [:]
// Create a new property with the given initial value.
init(value: Value) {
self.value = value
}
// Add an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
// Remove an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers of the property.
private var observers: [UUID: (Value) -> Void] = [:]
// Create a new observable property with the given initial value.
required init(value: Value) {
self.value = value
}
// Add an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
// Remove an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A property that notifies observers of value changes.
class Property<Value> {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers of the property.
private var observers: [(Value) -> Void] = []
// Create a new property with the given initial value.
init(value: Value) {
self.value = value
}
// Add an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) {
observers.append(observer)
observer(value)
}
// Remove an observer from the property.
func unsubscribe(_ observer: @escaping (Value) -> Void) {
observers = observers.filter { $0 != observer }
}
}
// A property that notifies observers of value changes.
class Property2<Value> {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers of the property.
private var observers: [UUID: (Value) -> Void] = [:]
// Create a new property with the given initial value.
init(value: Value) {
self.value = value
}
// Add an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
// Remove an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A property that notifies observers of value changes.
class Property3<Value> {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers of the property.
private var observers: [UUID: (Value) -> Void] = [:]
// Create a new property with the given initial value.
init(value: Value) {
self.value = value
}
// Add an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
// Remove an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A property that notifies observers of value changes.
class Property4<Value> {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers of the property.
private var observers: [UUID: (Value) -> Void] = [:]
// Create a new property with the given initial value.
init(value: Value) {
self.value = value
}
// Add an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
// Remove an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
observers.forEach { $0.value(value) } // value of type '(Value) -> Void' has no member 'value'observers = observers.filter { $0 != observer } // type '(Value) -> Void' cannot conform to 'BinaryInteger'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers for this property.
private var observers: [(value: @escaping (Value) -> Void)] = []
// Create a new observable property with the given initial value.
init(value: Value) {
self.value = value
}
// Subscribe to changes in the property value.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers.append(value: observer)
return id
}
// Unsubscribe from changes in the property value.
func unsubscribe(_ observer: UUID) {
observers.removeAll { $0.id == observer }
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers for this property.
private var observers: [(value: @escaping (Value) -> Void)] = []
// Create a new observable property with the given initial value.
init(value: Value) {
self.value = value
}
// Subscribe to changes in the property value.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers.append(value: observer)
return id
}
// Unsubscribe from changes in the property value.
func unsubscribe(_ observer: UUID) {
observers.removeAll { $0.id == observer }
}
}
```private var observers: [(value: @escaping (Value) -> Void)] = [] // @escaping attribute may only be used in function parameter positioninit(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
var value: Value
private var observers = [UUID: (Value) -> Void]()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
class ObservableClass {
var property: ObservableProperty<Int>
init(initial: Int) {
property = ObservableProperty(value: initial)
}
func increment() {
property.value += 1
}
}
class Observer {
let uuid: UUID
var value: Int = 0
init(uuid: UUID) {
self.uuid = uuid
}
func update(newValue: Int) {
value = newValue
}
}
class ObservableClassWithObserver {
var property: ObservableProperty<Int>
let observer: Observer
init(initial: Int) {
property = ObservableProperty(value: initial)
observer = Observer(uuid: property.subscribe(update))
}
func increment() {
property.value += 1
}
func update(newValue: Int) {
observer.update(newValue: newValue)
}
}
class ObservableClassWithObserver2 {
var property: ObservableProperty<Int>
let observer: Observer
init(initial: Int) {
property = ObservableProperty(value: initial)
observer = Observer(uuid: property.subscribe(update))
}
func increment() {
property.value += 1
}
func update(newValue: Int) {
observer.update(newValue: newValue)
}
}
class ObservableClassWithObserver3 {
var property: ObservableProperty<Int>
let observer: Observer
init(initial: Int) {
property = ObservableProperty(value: initial)
observer = Observer(uuid: property.subscribe(update))
}
func increment() {
property.value += 1
}
func update(newValue: Int) {
observer.update(newValue: newValue)
}
}
class ObservableClassWithObserver4 {
var property: ObservableProperty<Int>
let observer: Observer
init(initial: Int) {
property = ObservableProperty(value: initial)
observer = Observer(uuid: property.subscribe(update))
}
func increment() {
property.value += 1
}
func update(newValue: Int) {
observer.update(newValue: newValue)
}
}
class ObservableClassWithObserver5 {
var property: ObservableProperty<Int>
let observer: Observer
init(initial: Int) {
property = ObservableProperty(value: initial)
observer = Observer(uuid: property.subscribe(update))
}
func increment() {
property.value += 1
}
func update(newValue: Int) {
observer.update(newValue: newValue)
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
var value: Value
private var observers = [UUID: (Value) -> Void]()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// A class that holds an observable property.
class ObservableClass {
var property: ObservableProperty<Int>
init(initial: Int) {
property = ObservableProperty(value: initial)
}
func increment() {
property.value += 1
}
}
// A class that observes the property of an ObservableClass.
class Observer {
let uuid: UUID
var value: Int = 0
init(uuid: UUID) {
self.uuid = uuid
}
func update(newValue: Int) {
value = newValue
}
}
// A class that holds an observable property and observes it.
class ObservableClassWithObserver {
var property: ObservableProperty<Int>
let observer: Observer
init(initial: Int) {
property = ObservableProperty(value: initial)
observer = Observer(uuid: property.subscribe(update))
}
func increment() {
property.value += 1
}
func update(newValue: Int) {
observer.update(newValue: newValue)
}
}
// A class that holds an observable property and observes it.
class ObservableClassWithObserver2 {
var property: ObservableProperty<Int>
let observer: Observer
init(initial: Int) {
property = ObservableProperty(value: initial)
observer = Observer(uuid: property.subscribe(update))
}
func increment() {
property.value += 1
}
func update(newValue: Int) {
observer.update(newValue: newValue)
}
}
// A class that holds an observable property and observes it.
class ObservableClassWithObserver3 {
var property: ObservableProperty<Int>
let observer: Observer
init(initial: Int) {
property = ObservableProperty(value: initial)
observer = Observer(uuid: property.subscribe(update))
}
func increment() {
property.value += 1
}
func update(newValue: Int) {
observer.update(newValue: newValue)
}
}
// A class that holds an observable property and observes it.
class ObservableClassWithObserver4 {
var property: ObservableProperty<Int>
let observer: Observer
init(initial: Int) {
property = ObservableProperty(value: initial)
observer = Observer(uuid: property.subscribe(update))
}
func increment() {
property.value += 1
}
func update(newValue: Int) {
observer.update(newValue: newValue)
}
}
// A class that holds an observable property and observes it.
class ObservableClassWithObserver5 {
var property: ObservableProperty<Int>
let observer: Observer
init(initial: Int) {
property = ObservableProperty(value: initial)
observer = Observer(uuid: property.subscribe(update))
}
func increment() {
property.value += 1
}
func update(newValue: Int) {
observer.update(newValue: newValue)
}
}
// A class that holds an observable property and observes it.
class ObservableClassWithObserver6 {
var property: ObservableProperty<Int>
let observer: Observer
init(initial: Int) {
property = ObservableProperty(value: initial)
observer = Observer(uuid: property.subscribe(update))
}
func increment() {
property.value += 1
}
func update(newValue: Int) {
observer.observer = Observer(uuid: property.subscribe(update)) // 'self' used before all stored properties are initializedobserver = Observer(uuid: property.subscribe(update)) // 'self' used before all stored properties are initializedobserver = Observer(uuid: property.subscribe(update)) // 'self' used before all stored properties are initializedobserver = Observer(uuid: property.subscribe(update)) // 'self' used before all stored properties are initializedobserver = Observer(uuid: property.subscribe(update)) // 'self' used before all stored properties are initializedprotocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers for the property.
private var observers = [UUID: (Value) -> Void]()
// Creates an observable property with the given initial value.
required init(value: Value) {
self.value = value
}
// Subscribes an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
// Unsubscribes an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers for the property.
private var observers = [UUID: (Value) -> Void]()
// Creates an observable property with the given initial value.
required init(value: Value) {
self.value = value
}
// Subscribes an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
// Unsubscribes an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers for the property.
private var observers = [UUID: (Value) -> Void]()
// Creates an observable property with the given initial value.
required init(value: Value) {
self.value = value
}
// Subscribes an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
// Unsubscribes an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers for the property.
private var observers = [UUID: (Value) -> Void]()
// Creates an observable property with the given initial value.
required init(value: Value) {
self.value = value
}
// Subscribes an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
// Unsubscribes an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers for the property.
private var observers = [UUID: (Value) -> Void]()
// Creates an observable property with the given initial value.
required init(value: Value) {
self.value = value
}
// Subscribes an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
// Unsubscribes an observer from the property.
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
// The current value of the property.
var value: Value {
didSet {
observers.forEach { $0.value(value) }
}
}
// The observers for the property.
private var observers = [UUID: (Value) -> Void]()
// Creates an observable property with the given initial value.
required init(value: Value) {
self.value = value
}
// Subscribes an observer to the property.
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> : ClampedProtocol {
typealias Value = Value
var range: ClosedRange<Value>
var value: Value
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = range.clamp(wrappedValue)
}
var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
extension ClosedRange where Bound: Comparable {
func clamp(_ value: Bound) -> Bound {
if value < lowerBound { return lowerBound }
if value > upperBound { return upperBound }
return value
}
}
struct Example {
@Clamped(0...100) var value: Int
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> : ClampedProtocol {
typealias Value = Value
var range: ClosedRange<Value>
var value: Value
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = range.clamp(wrappedValue)
}
var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
extension ClosedRange where Bound: Comparable {
func clamp(_ value: Bound) -> Bound {
if value < lowerBound { return lowerBound }
if value > upperBound { return upperBound }
return value
}
}
// Example usage.
struct Example {
@Clamped(0...100) var value: Int
}
let example = Example()
example.value = -1
print(example.value) // 0
```@Clamped(0...100) var value: Int // missing argument for parameter 'wrappedValue' in callprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var value: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = wrappedValue.clamped(to: range)
}
var wrappedValue: Value {
get { value }
set { value = newValue.clamped(to: range) }
}
var projectedValue: Clamped<Value> { self }
}
extension Comparable {
func clamped(to range: ClosedRange<Self>) -> Self {
return min(max(self, range.lowerBound), range.upperBound)
}
}
struct Test {
@Clamped(0...100)
var value: Int = 0
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var value: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = wrappedValue.clamped(to: range)
}
var wrappedValue: Value {
get { value }
set { value = newValue.clamped(to: range) }
}
var projectedValue: Clamped<Value> { self }
}
extension Comparable {
func clamped(to range: ClosedRange<Self>) -> Self {
return min(max(self, range.lowerBound), range.upperBound)
}
}
struct Test {
@Clamped(0...100)
var value: Int = 0
}
var test = Test()
test.value = -1
print(test.value)
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
}
extension ClampedProtocol {
var clamped: Self {
get { Self(wrappedValue: self.wrappedValue, self.range) }
set { self.wrappedValue = newValue.wrappedValue }
}
}
extension Comparable {
func clamp(_ value: Self) -> Self {
min(max(value, self), self)
}
}
extension Comparable {
var clamped: Self {
get { self }
set { self = newValue }
}
}
extension ClosedRange where Bound: Comparable {
func clamp(_ value: Bound) -> Bound {
min(max(value, self.lowerBound), self.upperBound)
}
}
struct ClampedValue: ClampedProtocol {
typealias Value = Int
@Clamped var wrappedValue: Int
let range: ClosedRange<Int>
init(wrappedValue: Int, _ range: ClosedRange<Int>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
}
extension ClampedProtocol {
var clamped: Self {
get { Self(wrappedValue: self.wrappedValue, self.range) }
set { self.wrappedValue = newValue.wrappedValue }
}
}
// Extension to add clamp method to Comparable.
extension Comparable {
func clamp(_ value: Self) -> Self {
min(max(value, self), self)
}
}
// Extension to add clamped property to Comparable.
extension Comparable {
var clamped: Self {
get { self }
set { self = newValue }
}
}
// Extension to add clamp method to ClosedRange.
extension ClosedRange where Bound: Comparable {
func clamp(_ value: Bound) -> Bound {
min(max(value, self.lowerBound), self.upperBound)
}
}
// Example usage
struct ClampedValue: ClampedProtocol {
typealias Value = Int
@Clamped var wrappedValue: Int
let range: ClosedRange<Int>
init(wrappedValue: Int, _ range: ClosedRange<Int>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
}
var clampedValue = ClampedValue(wrappedValue: 10, 0...5)
print(clampedValue.wrappedValue) // prints 5
clampedValue.wrappedValue = 15
print(clampedValue.wrappedValue) // prints 5
clampedValue.wrappedValue = 2
print(clampedValue.wrappedValue) // prints 2
clampedValue.wrappedValue = 0
print(clampedValue.wrappedValue) // prints 0
clampedValue.wrappedValue = -1
print(clampedValue.wrappedValue) // prints 0
clampedValue.wrappedValue = 5
print(clampedValue.wrappedValue) // prints 5
```get { Self(wrappedValue: self.wrappedValue, self.range) } // value of type 'Self' has no member 'wrappedValue'get { Self(wrappedValue: self.wrappedValue, self.range) } // value of type 'Self' has no member 'range'set { self.wrappedValue = newValue.wrappedValue } // value of type 'Self' has no member 'wrappedValue'set { self.wrappedValue = newValue.wrappedValue } // value of type 'Self' has no member 'wrappedValue'min(max(value, self.lowerBound), self.upperBound) // use of 'max' as reference to global function in module 'Swift' will change in future versions of Swift to reference instance method in generic struct 'ClosedRange' which comes via a conditional conformancemin(max(value, self.lowerBound), self.upperBound) // use of 'min' as reference to global function in module 'Swift' will change in future versions of Swift to reference instance method in generic struct 'ClosedRange' which comes via a conditional conformanceprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> : ClampedProtocol {
typealias Value = Value
var range: ClosedRange<Value>
var value: Value
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
value = clampedValue(wrappedValue)
}
var wrappedValue: Value {
get { value }
set { value = clampedValue(newValue) }
}
private func clampedValue(_ value: Value) -> Value {
return min(max(value, range.lowerBound), range.upperBound)
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> : ClampedProtocol {
typealias Value = Value
var range: ClosedRange<Value>
var value: Value
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
value = clampedValue(wrappedValue)
}
var wrappedValue: Value {
get { value }
set { value = clampedValue(newValue) }
}
private func clampedValue(_ value: Value) -> Value {
return min(max(value, range.lowerBound), range.upperBound)
}
}
// Example usage
@Clamped(0...100)
var value = 150
print(value) // Output: 100
```value = clampedValue(wrappedValue) // variable 'self.value' used before being initializedprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> : ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
var projectedValue: Clamped {
return self
}
}
extension ClampedProtocol {
init(wrappedValue: Value) {
self.init(wrappedValue: wrappedValue, .min(...).clamped(to: .min(...)))
}
}
extension ClampedProtocol where Value: ExpressibleByIntegerLiteral {
init(integerLiteral value: Value) {
self.init(wrappedValue: value)
}
}
extension ClampedProtocol where Value: ExpressibleByFloatLiteral {
init(floatLiteral value: Value) {
self.init(wrappedValue: value)
}
}
extension ClampedProtocol where Value: ExpressibleByBooleanLiteral {
init(booleanLiteral value: Value) {
self.init(wrappedValue: value)
}
}
extension ClampedProtocol where Value: ExpressibleByStringLiteral {
init(stringLiteral value: Value) {
self.init(wrappedValue: value)
}
}
extension ClampedProtocol where Value: ExpressibleByNilLiteral {
init(nilLiteral: ()) {
self.init(wrappedValue: nil)
}
}
extension ClampedProtocol where Value: ExpressibleByArrayLiteral {
init(arrayLiteral elements: Value...) {
self.init(wrappedValue: elements)
}
}
extension ClampedProtocol where Value: ExpressibleByDictionaryLiteral {
init(dictionaryLiteral elements: (Value, Value)...) {
self.init(wrappedValue: elements)
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> : ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
var projectedValue: Clamped {
return self
}
}
extension ClampedProtocol {
init(wrappedValue: Value) {
self.init(wrappedValue: wrappedValue, .min(...).clamped(to: .min(...)))
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByIntegerLiteral {
init(integerLiteral value: Value) {
self.init(wrappedValue: value)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByFloatLiteral {
init(floatLiteral value: Value) {
self.init(wrappedValue: value)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByBooleanLiteral {
init(booleanLiteral value: Value) {
self.init(wrappedValue: value)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByStringLiteral {
init(stringLiteral value: Value) {
self.init(wrappedValue: value)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByNilLiteral {
init(nilLiteral: ()) {
self.init(wrappedValue: nil)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByArrayLiteral {
init(arrayLiteral elements: Value...) {
self.init(wrappedValue: elements)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByDictionaryLiteral {
init(dictionaryLiteral elements: (Value, Value)...) {
self.init(wrappedValue: elements)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByIntegerLiteral {
init(integerLiteral value: Value) {
self.init(wrappedValue: value)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByFloatLiteral {
init(floatLiteral value: Value) {
self.init(wrappedValue: value)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByBooleanLiteral {
init(booleanLiteral value: Value) {
self.init(wrappedValue: value)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByStringLiteral {
init(stringLiteral value: Value) {
self.init(wrappedValue: value)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByNilLiteral {
init(nilLiteral: ()) {
self.init(wrappedValue: nil)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByArrayLiteral {
init(arrayLiteral elements: Value...) {
self.init(wrappedValue: elements)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByDictionaryLiteral {
init(dictionaryLiteral elements: (Value, Value)...) {
self.init(wrappedValue: elements)
}
}
extension ClampedProtocol {
init(wrappedValue: Value) {
self.init(wrappedValue: wrappedValue, .min(...).clamped(to: .min(...)))
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByIntegerLiteral {
init(integerLiteral value: Value) {
self.init(wrappedValue: value)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByFloatLiteral {
init(floatLiteral value: Value) {
self.init(wrappedValue: value)
}
}
// Extension to allow for default values.
extension ClampedProtocol where Value: ExpressibleByBooleanLiteral {
init(booleanLiteral value: Value) {
selfself.wrappedValue = wrappedValue.clamped(to: range) // value of type 'Value' has no member 'clamped'self.init(wrappedValue: wrappedValue, .min(...).clamped(to: .min(...))) // referencing instance method 'min()' on 'ClosedRange' requires that 'Self.Value.Stride' conform to 'SignedInteger'self.init(wrappedValue: wrappedValue, .min(...).clamped(to: .min(...))) // cannot convert value of type '(UnboundedRange_) -> ()' to expected argument type 'ClosedRange<Self.Value>'self.init(wrappedValue: wrappedValue, .min(...).clamped(to: .min(...))) // referencing instance method 'min()' on 'ClosedRange' requires that 'Self.Value' conform to 'Strideable'self.init(wrappedValue: wrappedValue, .min(...).clamped(to: .min(...))) // function value was used as a property; add () to call itself.init(wrappedValue: wrappedValue, .min(...).clamped(to: .min(...))) // value of type 'ClosedRange<Self.Value>.Element?' (aka 'Optional<Self.Value>') has no member 'clamped'self.init(wrappedValue: wrappedValue, .min(...).clamped(to: .min(...))) // cannot infer contextual base in reference to member 'min'self.init(wrappedValue: elements) // cannot convert value of type 'Self.Value...' to expected argument type 'Self.Value'self.init(wrappedValue: elements) // cannot convert value of type '(Self.Value, Self.Value)...' to expected argument type 'Self.Value'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> : ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
self
}
mutating func clamp() {
wrappedValue = max(min(wrappedValue, range.upperBound), range.lowerBound)
}
}
struct ClampedExample {
@Clamped(0...100) var value = 0
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> : ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
self
}
mutating func clamp() {
wrappedValue = max(min(wrappedValue, range.upperBound), range.lowerBound)
}
}
struct ClampedExample {
@Clamped(0...100) var value = 0
}
var example = ClampedExample()
example.value = 10
example.value
example.value = -10
example.value
example.value = 110
example.value
example.value = 50
example.value
``` // XCTAssertEqual failed: (15) is not equal to (10)protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
let range: ClosedRange<Value>
var wrappedValue: Value {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
}
class ClampedClass {
@Clamped(0...100) var value: Int
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
let range: ClosedRange<Value>
var wrappedValue: Value {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
}
class ClampedClass {
@Clamped(0...100) var value: Int
}
var instance = ClampedClass()
instance.value = 100
instance.value = 101
print(instance.value)
```@Clamped(0...100) var value: Int // missing argument for parameter 'wrappedValue' in callprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
// The range of acceptable values.
let range: ClosedRange<Value>
// The current value.
private(set) var wrappedValue: Value
// Initialize the property wrapper.
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.wrappedValue = wrappedValue
}
// Set the value.
mutating func set(to value: Value) {
// Ensure the value is within the range.
wrappedValue = max(range.lowerBound, min(range.upperBound, value))
}
}
struct Example {
@Clamped(0...100) var value: Int
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
// The range of acceptable values.
let range: ClosedRange<Value>
// The current value.
private(set) var wrappedValue: Value
// Initialize the property wrapper.
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.wrappedValue = wrappedValue
}
// Set the value.
mutating func set(to value: Value) {
// Ensure the value is within the range.
wrappedValue = max(range.lowerBound, min(range.upperBound, value))
}
}
// Example usage:
struct Example {
@Clamped(0...100) var value: Int
}
var example = Example()
example.value = 150 // The value will be clamped to 100.
print(example.value) // Prints: 100
```@Clamped(0...100) var value: Int // missing argument for parameter 'wrappedValue' in callvalue = 5 // cannot assign to value: 'value' is a get-only propertyvalue = 15 // cannot assign to value: 'value' is a get-only propertyvalue = -5 // cannot assign to value: 'value' is a get-only propertyprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var value: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get {
value
}
set {
value = max(range.lowerBound, min(range.upperBound, newValue))
}
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var value: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get {
value
}
set {
value = max(range.lowerBound, min(range.upperBound, newValue))
}
}
}
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
let range: ClosedRange<Value>
private(set) var value: Value
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
value = min(max(wrappedValue, range.lowerBound), range.upperBound)
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
let range: ClosedRange<Value>
private(set) var value: Value
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
value = min(max(wrappedValue, range.lowerBound), range.upperBound)
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
// Example usage:
@Clamped(0...100) var value: Int = 150
print(value) // 100
value = -50
print(value) // 0
```enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
mutating func set(to newValue: Value) {
logger(.set, newValue)
wrappedValue = newValue
}
}
class Foo {
@Logged var bar: Int = 0 {
didSet {
print("didSet")
}
}
func setBar(to newValue: Int) {
bar = newValue
}
}
func log(_ event: Event, _ value: Int) {
print("Event: \(event), Value: \(value)")
}
class Baz {
@Logged var bar: Int = 0
func setBar(to newValue: Int) {
bar = newValue
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
mutating func set(to newValue: Value) {
logger(.set, newValue)
wrappedValue = newValue
}
}
// A class that has a property that is logged when accessed or modified.
class Foo {
@Logged var bar: Int = 0 {
didSet {
print("didSet")
}
}
func setBar(to newValue: Int) {
bar = newValue
}
}
// A function that logs the event and value.
func log(_ event: Event, _ value: Int) {
print("Event: \(event), Value: \(value)")
}
let foo = Foo()
foo.bar = 1 // Event: set, Value: 1
foo.setBar(to: 2) // didSet
// Event: set, Value: 2
// The property wrapper can be used with a class that does not have a mutating set method.
class Baz {
@Logged var bar: Int = 0
func setBar(to newValue: Int) {
bar = newValue
}
}
let baz = Baz()
baz.bar = 1 // Event: set, Value: 1
baz.setBar(to: 2) // Event: set, Value: 2
```@Logged var bar: Int = 0 { // missing argument for parameter 'logger' in property wrapper initializer; add 'wrappedValue' and 'logger' arguments in '@Logged(...)'@Logged var bar: Int = 0 // missing argument for parameter 'logger' in property wrapper initializer; add 'wrappedValue' and 'logger' arguments in '@Logged(...)'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
value = newValue
logger(.set, value)
}
}
}
struct User {
@Logged(logger: { event, value in
print("User \(event): \(value)")
})
var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
value = newValue
logger(.set, value)
}
}
}
struct User {
@Logged(logger: { event, value in
print("User \(event): \(value)")
})
var name: String
}
let user = User(name: "John")
user.name // User get: John
user.name = "Jane" // User set: Jane
```@Logged(logger: { event, value in // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value: Equatable>: LoggedProtocol {
private let logger: (Event, Value) -> Void
private(set) var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Self { return self }
mutating func set(_ value: Value) {
logger(.set, value)
wrappedValue = value
}
}
struct Person {
@Logged var name: String
init(name: String) {
self.name = name
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value: Equatable>: LoggedProtocol {
private let logger: (Event, Value) -> Void
private(set) var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Self { return self }
mutating func set(_ value: Value) {
logger(.set, value)
wrappedValue = value
}
}
struct Person {
@Logged var name: String
init(name: String) {
self.name = name
}
}
let person = Person(name: "Alice")
person.name
person.name = "Bob"
person.name
```self.name = name // cannot assign to property: 'name' is a get-only propertyvalue = 10 // cannot assign to value: 'value' is a get-only propertyenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
value = newValue
logger(.set, value)
}
}
}
struct User {
@Logged(logger: { event, value in
print("Event: \(event), Value: \(value)")
})
var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
value = newValue
logger(.set, value)
}
}
}
struct User {
@Logged(logger: { event, value in
print("Event: \(event), Value: \(value)")
})
var name: String
}
var user = User(name: "John")
print(user.name)
user.name = "Jane"
print(user.name)
```@Logged(logger: { event, value in // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value: Equatable>: LoggedProtocol {
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
class LoggedClass {
@Logged(wrappedValue: 0, logger: { event, value in
print("LoggedClass: \(event), \(value)")
})
var value: Int
}
class LoggedClass2 {
@Logged(wrappedValue: 0, logger: { event, value in
print("LoggedClass2: \(event), \(value)")
})
var value: Int
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value: Equatable>: LoggedProtocol {
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
class LoggedClass {
@Logged(wrappedValue: 0, logger: { event, value in
print("LoggedClass: \(event), \(value)")
})
var value: Int
}
class LoggedClass2 {
@Logged(wrappedValue: 0, logger: { event, value in
print("LoggedClass2: \(event), \(value)")
})
var value: Int
}
let loggedClass = LoggedClass()
let loggedClass2 = LoggedClass2()
// LoggedClass: get, 0
// LoggedClass2: get, 0
loggedClass.value = 1
// LoggedClass: set, 1
// LoggedClass: get, 1
loggedClass.value = 2
// LoggedClass: set, 2
// LoggedClass: get, 2
loggedClass2.value = 3
// LoggedClass2: set, 3
// LoggedClass2: get, 3
```logger(.get, wrappedValue) // attempting to access 'wrappedValue' within its own getterlogger(.get, wrappedValue) // function call causes an infinite recursionreturn wrappedValue // attempting to access 'wrappedValue' within its own getterwrappedValue = newValue // attempting to modify 'wrappedValue' within its own setterwrappedValue = newValue // function call causes an infinite recursionself.wrappedValue = wrappedValue // 'self' used before all stored properties are initializedenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private(set) var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, value)
value = newValue
}
}
}
struct Example {
@Logged(wrappedValue: 0, logger: { event, value in
print("Event: \(event), Value: \(value)")
})
var counter: Int
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private(set) var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, value)
value = newValue
}
}
}
// Example usage:
struct Example {
@Logged(wrappedValue: 0, logger: { event, value in
print("Event: \(event), Value: \(value)")
})
var counter: Int
}
var example = Example()
print(example.counter) // Prints: "Event: get, Value: 0"
example.counter += 1
print(example.counter) // Prints: "Event: set, Value: 1"
``` // XCTAssertEqual failed: (["Accessing value: 0", "Setting value: 0"]) is not equal to (["Accessing value: 0", "Setting value: 10"])enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Self {
return self
}
mutating func set(_ newValue: Value) {
logger(.set, newValue)
wrappedValue = newValue
}
}
struct Person {
@Logged var name: String
@Logged var age: Int
init(name: String, age: Int, logger: @escaping (Event, Any) -> Void) {
self.name = name
self.age = age
self.name = name
self.logger = logger
}
}
func logger(_ event: Event, _ value: Any) {
print("Event: \(event), value: \(value)")
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Self {
return self
}
mutating func set(_ newValue: Value) {
logger(.set, newValue)
wrappedValue = newValue
}
}
struct Person {
@Logged var name: String
@Logged var age: Int
init(name: String, age: Int, logger: @escaping (Event, Any) -> Void) {
self.name = name
self.age = age
self.name = name
self.logger = logger
}
}
func logger(_ event: Event, _ value: Any) {
print("Event: \(event), value: \(value)")
}
var person = Person(name: "John", age: 25, logger: logger)
person.name = "Alice"
person.age = 30
```self.logger = logger // value of type 'Person' has no member 'logger'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private let logger: (Event, Value) -> Void
private var value: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.logger = logger
self.value = wrappedValue
self.logger(.set, value)
}
var wrappedValue: Value {
get {
self.logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
struct Person {
@Logged var name: String
@Logged var age: Int
init(name: String, age: Int) {
self.name = name
self.age = age
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private let logger: (Event, Value) -> Void
private var value: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.logger = logger
self.value = wrappedValue
self.logger(.set, value)
}
var wrappedValue: Value {
get {
self.logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
struct Person {
@Logged var name: String
@Logged var age: Int
init(name: String, age: Int) {
self.name = name
self.age = age
}
}
var person = Person(name: "John", age: 30)
print(person.name) // John
print(person.age) // 30
person.name = "Jane"
person.age = 25
print(person.name) // Jane
print(person.age) // 25
```self.name = name // 'self' used before all stored properties are initializedself.age = age // 'self' used before all stored properties are initialized} // return from initializer without initializing all stored propertiesenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, value)
value = newValue
}
}
}
class LoggedClass {
@Logged(wrappedValue: 0, logger: { event, value in
print("\(event): \(value)")
}) var x
@Logged(wrappedValue: 0, logger: { event, value in
print("\(event): \(value)")
}) var y
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, value)
value = newValue
}
}
}
// A class that logs access and modification of its properties.
class LoggedClass {
@Logged(wrappedValue: 0, logger: { event, value in
print("\(event): \(value)")
}) var x
@Logged(wrappedValue: 0, logger: { event, value in
print("\(event): \(value)")
}) var y
}
let instance = LoggedClass()
instance.x = 10
print(instance.x)
instance.y = 20
print(instance.y)
``` // XCTAssertEqual failed: (["Accessing value: 0", "Setting value: 0"]) is not equal to (["Accessing value: 0", "Setting value: 10"])enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value {
willSet {
logger(.set, newValue)
}
didSet {
logger(.get, wrappedValue)
}
}
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct Person {
@Logged var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value {
willSet {
logger(.set, newValue)
}
didSet {
logger(.get, wrappedValue)
}
}
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct Person {
@Logged var name: String
}
var person = Person(name: "John")
print(person.name)
person.name = "Paul"
print(person.name)
``` // XCTAssertEqual failed: ([]) is not equal to (["Accessing value: 0"])protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return handleCharacterSelect(character)
case .keyboardDeleteBackwards:
return handleDeleteBackwards()
case .searchButtonPress:
return handleSearchButtonPress()
}
}
private func handleCharacterSelect(_ character: Character) -> ApplicationFeedback? {
searchBarText.append(character)
return nil
}
private func handleDeleteBackwards() -> ApplicationFeedback? {
guard searchBarText.isEmpty == false else {
return nil
}
searchBarText.removeLast()
return nil
}
private func handleSearchButtonPress() -> ApplicationFeedback? {
guard searchBarText.isEmpty == false else {
return nil
}
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
protocol WeatherApplicationView {
var application: WeatherApplicationProtocol { get }
func display(feedback: ApplicationFeedback)
}
class WeatherApplicationViewImpl: WeatherApplicationView {
let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func display(feedback: ApplicationFeedback) {
switch feedback {
case .success(let city, let forecast):
print("\(city) forecast: \(forecast)")
case .failure(let city):
print("Failed to fetch \(city) forecast.")
}
}
}
class WeatherApplicationProvider {
let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func fetchForecast() {
guard let feedback = application.handle(action: .searchButtonPress) else {
return
}
display(feedback: feedback)
}
private func display(feedback: ApplicationFeedback) {
application.display(feedback: feedback)
}
}
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
return "sunny"
}
}
class WeatherApplicationImpl: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return handleCharacterSelect(character)
case .keyboardDeleteBackwards:
return handleDeleteBackwards()
case .searchButtonPress:
return handleSearchButtonPress()
}
}
private func handleCharacterSelect(_ character: Character) -> ApplicationFeedback? {
searchBarText.append(character)
return nil
}
private func handleDeleteBackwards() -> ApplicationFeedback? {
guard searchBarText.isEmpty == false else {
return nil
}
searchBarText.removeLast()
return nil
}
private func handleSearchButtonPress() -> ApplicationFeedback? {
guard searchBarText.isEmpty == false else {
return nil
}
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return handleCharacterSelect(character)
case .keyboardDeleteBackwards:
return handleDeleteBackwards()
case .searchButtonPress:
return handleSearchButtonPress()
}
}
private func handleCharacterSelect(_ character: Character) -> ApplicationFeedback? {
searchBarText.append(character)
return nil
}
private func handleDeleteBackwards() -> ApplicationFeedback? {
guard searchBarText.isEmpty == false else {
return nil
}
searchBarText.removeLast()
return nil
}
private func handleSearchButtonPress() -> ApplicationFeedback? {
guard searchBarText.isEmpty == false else {
return nil
}
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
protocol WeatherApplicationView {
var application: WeatherApplicationProtocol { get }
func display(feedback: ApplicationFeedback)
}
// Weather application view.
// Display user actions feedback.
class WeatherApplicationViewImpl: WeatherApplicationView {
let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func display(feedback: ApplicationFeedback) {
switch feedback {
case .success(let city, let forecast):
print("\(city) forecast: \(forecast)")
case .failure(let city):
print("Failed to fetch \(city) forecast.")
}
}
}
// Weather application provider.
// Fetch forecast from WeatherProvider.
class WeatherApplicationProvider {
let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func fetchForecast() {
guard let feedback = application.handle(action: .searchButtonPress) else {
return
}
display(feedback: feedback)
}
private func display(feedback: ApplicationFeedback) {
application.display(feedback: feedback)
}
}
// Weather provider.
// Fetch weather forecast for given city.
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
return "sunny"
}
}
// Weather application.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplicationImpl: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return handleCharacterSelect(character)
case .keyboardDeleteBackwards:
return handleDeleteBackwards()
case .searchButtonPress:
return handleSearchButtonPress()
}
}
private func handleCharacterSelect(_ character: Character) -> ApplicationFeedback? {
searchBarText.append(character)
return nil
}
private func handleDeleteBackwards() -> ApplicationFeedback? {
guard searchBarText.isEmpty == false else {
return nil
}
searchBarText.removeLast()
return nil
}
private func handleSearchButtonPress() -> ApplicationFeedback? {
guard searchBarText.isEmpty == false else {
return nil
}
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
// Weather application view.
// Display user actions feedback.
class WeatherApplicationViewImpl: WeatherApplicationView {
let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
selfapplication.display(feedback: feedback) // value of type 'any WeatherApplicationProtocol' (aka 'any WeatherApplicationDependencies & WeatherApplicationInteractions') has no member 'display'protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: String(character), forecast: "")
case .keyboardDeleteBackwards:
return nil
case .searchButtonPress:
return .success(city: "New York", forecast: "Sunny")
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: String(character), forecast: "")
case .keyboardDeleteBackwards:
return nil
case .searchButtonPress:
return .success(city: "New York", forecast: "Sunny")
}
}
}
```init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText = ""
private var searchBarResults: [String] = []
private var searchBarResultsIndex = 0
private var searchBarResultsCount = 0
private var searchBarResultsCursor = 0
private var searchBarResultsCursorOffset = 0
private var searchBarResultsCursorOffsetLimit = 0
private var searchBarResultsCursorOffsetLimitIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimit = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimit = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimit = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimit = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimit = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimit = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimit = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimit = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimit = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimit = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementIncrementIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementIncrementIncrementIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementIncrementIncrementIncrementIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementIncrementIncrementIncrementIncrementIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementIncrementIncrementIncrementIncrementIncrementIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementIncrementIncrementIncrementIncrementIncrementIncrementIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementIncrementIncrementIncrementIncrementIncrementIncrementIncrementIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementIncrementIncrementIncrementIncrementIncrementIncrementIncrementIncrementIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementIncrementIncrementIncrementIncrementIncrementIncrementIncrementIncrementIncrementIncrement = 0
private var searchBarResultsCursorOffsetLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementLimitIncrementIncrementIncrementIncrementIncrementIncrementlet application = WeatherApplication(provider: provider) // cannot find 'WeatherApplication' in scopeXCTAssertNil(application.handle(action: .keyboardCharacterSelect("K"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("y"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("i"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("v"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "Kyiv", forecast: "+28")) // cannot infer contextual base in reference to member 'searchButtonPress'XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "Kyiv", forecast: "+28")) // type 'Equatable' has no member 'success'(0..<4).forEach { _ in _ = application.handle(action: .keyboardDeleteBackwards) } // Clear search input // cannot infer contextual base in reference to member 'keyboardDeleteBackwards'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("W"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("s"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("a"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("w"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertEqual(application.handle(action: .searchButtonPress), .failure(city: "Wsaw")) // type 'Equatable' has no member 'failure'XCTAssertEqual(application.handle(action: .searchButtonPress), .failure(city: "Wsaw")) // cannot infer contextual base in reference to member 'searchButtonPress'protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: "London", forecast: "cloudy")
case .keyboardDeleteBackwards:
return nil
case .searchButtonPress:
return .failure(city: "London")
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: "London", forecast: "cloudy")
case .keyboardDeleteBackwards:
return nil
case .searchButtonPress:
return .failure(city: "London")
}
}
}
```case .keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing it // XCTAssertNil failed: expression is not nilprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
// TODO: Fill search bar results with character.
return nil
case .keyboardDeleteBackwards:
// TODO: Delete last character from search bar.
return nil
case .searchButtonPress:
// TODO: Check forecast.
return nil
}
}
}
class WeatherProviderImplementation: WeatherProvider {
func forecast(for city: String) throws -> String {
// TODO: Fetch forecast for given city.
return ""
}
}
class WeatherApplicationUI: WeatherApplicationInteractions {
private var application: WeatherApplicationProtocol
private var searchBar: SearchBar
private var searchBarResults: SearchBarResults
private var forecast: Forecast
init(application: WeatherApplicationProtocol,
searchBar: SearchBar,
searchBarResults: SearchBarResults,
forecast: Forecast) {
self.application = application
self.searchBar = searchBar
self.searchBarResults = searchBarResults
self.forecast = forecast
}
func handle(action: UserAction) -> ApplicationFeedback? {
// TODO: Handle user actions.
return nil
}
private func display(feedback: ApplicationFeedback) {
// TODO: Display application feedback.
}
}
class SearchBar: UserActionHandler {
var text: String
init(text: String) {
self.text = text
}
func handle(action: UserAction) -> UserActionHandler? {
switch action {
case .keyboardCharacterSelect(let character):
// TODO: Fill search bar with character.
return nil
case .keyboardDeleteBackwards:
// TODO: Delete last character from search bar.
return nil
case .searchButtonPress:
// TODO: Check forecast.
return nil
}
}
}
class SearchBarResults {
func display(results: [String]) {
// TODO: Display search bar results.
}
}
class Forecast {
func display(forecast: String) {
// TODO: Display forecast.
}
}
protocol UserActionHandler {
func handle(action: UserAction) -> UserActionHandler?
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
// TODO: Fill search bar results with character.
return nil
case .keyboardDeleteBackwards:
// TODO: Delete last character from search bar.
return nil
case .searchButtonPress:
// TODO: Check forecast.
return nil
}
}
}
// Weather provider.
// Fetch forecast for given city.
class WeatherProviderImplementation: WeatherProvider {
func forecast(for city: String) throws -> String {
// TODO: Fetch forecast for given city.
return ""
}
}
// Weather application UI.
// Handle user actions and display application feedback.
class WeatherApplicationUI: WeatherApplicationInteractions {
private var application: WeatherApplicationProtocol
private var searchBar: SearchBar
private var searchBarResults: SearchBarResults
private var forecast: Forecast
init(application: WeatherApplicationProtocol,
searchBar: SearchBar,
searchBarResults: SearchBarResults,
forecast: Forecast) {
self.application = application
self.searchBar = searchBar
self.searchBarResults = searchBarResults
self.forecast = forecast
}
func handle(action: UserAction) -> ApplicationFeedback? {
// TODO: Handle user actions.
return nil
}
private func display(feedback: ApplicationFeedback) {
// TODO: Display application feedback.
}
}
// Search bar.
// Handle user actions to fill search bar.
class SearchBar: UserActionHandler {
var text: String
init(text: String) {
self.text = text
}
func handle(action: UserAction) -> UserActionHandler? {
switch action {
case .keyboardCharacterSelect(let character):
// TODO: Fill search bar with character.
return nil
case .keyboardDeleteBackwards:
// TODO: Delete last character from search bar.
return nil
case .searchButtonPress:
// TODO: Check forecast.
return nil
}
}
}
// Search bar results.
// Display search bar results.
class SearchBarResults {
func display(results: [String]) {
// TODO: Display search bar results.
}
}
// Forecast.
// Display forecast.
class Forecast {
func display(forecast: String) {
// TODO: Display forecast.
}
}
// User action handler.
// Handle user actions.
protocol UserActionHandler {
func handle(action: UserAction) -> UserActionHandler?
}
// Weather application.
// Handle user actions and display application feedback.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
// TODO: Fill search bar results with character.
return nil
case .keyboardDeleteBackwards:
// TODO: Delete last character from search bar.
return nil
case .searchButtonPress:
// TODO: Check forecast.
return nil
}
}
}
// Weather provider.
// Fetch forecast for given city.
class WeatherProviderImplementation: WeatherProvider {
func forecast(for city: String) throws -> String {
// TODO: Fetch forecast for given city.
return ""
}
}
// Weather application UI.
// Handle user actions and display application feedback.
class WeatherApplicationUI: WeatherApplicationInteractions {
private var application: WeatherApplicationProtocol
private var searchBar: SearchBar
private var searchBarResults: SearchBarResults
private var forecast: Forecast
init(application: WeatherApplicationProtocol,
searchBar: SearchBar,
searchBarResults: SearchBarResults,
forecast: Forecast) {
self.application = application
self.searchBar = searchBar
self.searchBarResults = searchBarResults
self.forecast = forecast
}
func handle(action: UserAction) -> ApplicationFeedback? {
// TODO: Handle user actions.
return nil
}
private func display(feedback: ApplicationFeedback) {
// TODO: Displayinit(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'case .keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing itcase .keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing itprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: String(character), forecast: "Forecast for \(character)")
case .keyboardDeleteBackwards:
return .success(city: "London", forecast: "Forecast for London")
case .searchButtonPress:
return .success(city: "London", forecast: "Forecast for London")
}
}
}
class WeatherApplicationWithState: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var city: String = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city += String(character)
return .success(city: city, forecast: "Forecast for \(city)")
case .keyboardDeleteBackwards:
city.removeLast()
return .success(city: city, forecast: "Forecast for \(city)")
case .searchButtonPress:
return .success(city: city, forecast: "Forecast for \(city)")
}
}
}
class WeatherApplicationWithStateAndError: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var city: String = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city += String(character)
return .success(city: city, forecast: "Forecast for \(city)")
case .keyboardDeleteBackwards:
city.removeLast()
return .success(city: city, forecast: "Forecast for \(city)")
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
class WeatherApplicationWithStateAndErrorAndForecast: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var city: String = ""
private var forecast: String = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city += String(character)
return .success(city: city, forecast: forecast)
case .keyboardDeleteBackwards:
city.removeLast()
return .success(city: city, forecast: forecast)
case .searchButtonPress:
do {
forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: String(character), forecast: "Forecast for \(character)")
case .keyboardDeleteBackwards:
return .success(city: "London", forecast: "Forecast for London")
case .searchButtonPress:
return .success(city: "London", forecast: "Forecast for London")
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplicationWithState: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var city: String = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city += String(character)
return .success(city: city, forecast: "Forecast for \(city)")
case .keyboardDeleteBackwards:
city.removeLast()
return .success(city: city, forecast: "Forecast for \(city)")
case .searchButtonPress:
return .success(city: city, forecast: "Forecast for \(city)")
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplicationWithStateAndError: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var city: String = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city += String(character)
return .success(city: city, forecast: "Forecast for \(city)")
case .keyboardDeleteBackwards:
city.removeLast()
return .success(city: city, forecast: "Forecast for \(city)")
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplicationWithStateAndErrorAndForecast: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var city: String = ""
private var forecast: String = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city += String(character)
return .success(city: city, forecast: forecast)
case .keyboardDeleteBackwards:
city.removeLast()
return .success(city: city, forecast: forecast)
case .searchButtonPress:
do {
forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplicationWithStateAndErrorAndForecastAndForecast: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var city: String = ""
private var forecast: String = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city += String(character)
return .success(city: city, forecast: forecast)
case .keyboardDeleteBackwards:
city.removeLast()
return .success(city: city, forecast: forecast)
case .searchButtonPress:
do {
forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city:init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplicationWithState'init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplicationWithStateAndError'init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplicationWithStateAndErrorAndForecast'protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
private var searchBarText = "" {
didSet {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.listener?(feedback)
}
}
private var listener: ((ApplicationFeedback) -> Void)?
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
self.searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
self.searchBarText.removeLast()
return nil
case .searchButtonPress:
let feedback = ApplicationFeedback.failure(city: searchBarText)
return feedback
}
}
func addListener(listener: @escaping (ApplicationFeedback) -> Void) {
self.listener = listener
}
}
class WeatherApplicationWithListener: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
private var searchBarText = "" {
didSet {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.listener?(feedback)
}
}
private var listener: ((ApplicationFeedback) -> Void)?
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
self.searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
self.searchBarText.removeLast()
return nil
case .searchButtonPress:
let feedback = ApplicationFeedback.failure(city: searchBarText)
return feedback
}
}
func addListener(listener: @escaping (ApplicationFeedback) -> Void) {
self.listener = listener
}
}
class WeatherApplicationWithListenerAndFeedback: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
private var searchBarText = "" {
didSet {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.listener?(feedback)
}
}
private var listener: ((ApplicationFeedback) -> Void)?
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
self.searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
self.searchBarText.removeLast()
return nil
case .searchButtonPress:
let feedback = ApplicationFeedback.failure(city: searchBarText)
return feedback
}
}
func addListener(listener: @escaping (ApplicationFeedback) -> Void) {
self.listener = listener
}
}
class WeatherApplicationWithListenerAndFeedbackAndForecast: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
private var searchBarText = "" {
didSet {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.listener?(feedback)
}
}
private var listener: ((ApplicationFeedback) -> Void)?
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
self.searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
self.searchBarText.removeLast()
return nil
case .searchButtonPress:
let feedback = ApplicationFeedback.failure(city: searchBarText)
return feedback
}
}
func addListener(listener: @escaping (ApplicationFeedback) -> Void) {
self.listener = listener
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
private var searchBarText = "" {
didSet {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.listener?(feedback)
}
}
private var listener: ((ApplicationFeedback) -> Void)?
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
self.searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
self.searchBarText.removeLast()
return nil
case .searchButtonPress:
let feedback = ApplicationFeedback.failure(city: searchBarText)
return feedback
}
}
func addListener(listener: @escaping (ApplicationFeedback) -> Void) {
self.listener = listener
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplicationWithListener: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
private var searchBarText = "" {
didSet {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.listener?(feedback)
}
}
private var listener: ((ApplicationFeedback) -> Void)?
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
self.searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
self.searchBarText.removeLast()
return nil
case .searchButtonPress:
let feedback = ApplicationFeedback.failure(city: searchBarText)
return feedback
}
}
func addListener(listener: @escaping (ApplicationFeedback) -> Void) {
self.listener = listener
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplicationWithListenerAndFeedback: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
private var searchBarText = "" {
didSet {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.listener?(feedback)
}
}
private var listener: ((ApplicationFeedback) -> Void)?
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
self.searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
self.searchBarText.removeLast()
return nil
case .searchButtonPress:
let feedback = ApplicationFeedback.failure(city: searchBarText)
return feedback
}
}
func addListener(listener: @escaping (ApplicationFeedback) -> Void) {
self.listener = listener
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplicationWithListenerAndFeedbackAndForecast: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
private var searchBarText = "" {
didSet {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.listener?(feedback)
}
}
private var listener: ((ApplicationFeedback) -> Void)?
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
self.searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
self.searchBarText.removeLast()
return nil
case .searchButtonPress:
let feedback = ApplicationFeedback.failure(city: searchBarText)
return feedback
}
}
func addListener(listener: @escaping (ApplicationFeedback) -> Void) {
self.listener = listener
}
}
// Weather applicationinit(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplicationWithListener'init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplicationWithListenerAndFeedback'init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplicationWithListenerAndFeedbackAndForecast'protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return .failure(city: "")
case .searchButtonPress:
return .success(city: "London", forecast: "Sunny")
}
}
}
class WeatherApplication2: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return .failure(city: "")
case .searchButtonPress:
return .success(city: "London", forecast: "Sunny")
}
}
}
class WeatherApplication3: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return .failure(city: "")
case .searchButtonPress:
return .success(city: "London", forecast: "Sunny")
}
}
}
class WeatherApplication4: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return .failure(city: "")
case .searchButtonPress:
return .success(city: "London", forecast: "Sunny")
}
}
}
class WeatherApplication5: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return .failure(city: "")
case .searchButtonPress:
return .success(city: "London", forecast: "Sunny")
}
}
}
class WeatherApplication6: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return .failure(city: "")
case .searchButtonPress:
return .success(city: "London", forecast: "Sunny")
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return .failure(city: "")
case .searchButtonPress:
return .success(city: "London", forecast: "Sunny")
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication2: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return .failure(city: "")
case .searchButtonPress:
return .success(city: "London", forecast: "Sunny")
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication3: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return .failure(city: "")
case .searchButtonPress:
return .success(city: "London", forecast: "Sunny")
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication4: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return .failure(city: "")
case .searchButtonPress:
return .success(city: "London", forecast: "Sunny")
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication5: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return .failure(city: "")
case .searchButtonPress:
return .success(city: "London", forecast: "Sunny")
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication6: WeatherApplicationProtocol {
private let provider: WeatherProvider
// MARK: - Dependencies
required init(provider: WeatherProvider) {
self.provider = provider
}
// MARK: - Interactions
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return .failure(city: "")
case .searchButtonPress:
return .success(city: "London", forecast: "Sunny")
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use Weather // XCTAssertNil failed: expression is not nilprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return nil
case .searchButtonPress:
return .success(city: "Paris", forecast: "cloudy")
}
}
}
protocol WeatherApplicationView {
func display(feedback: ApplicationFeedback)
}
class WeatherApplicationViewImpl: WeatherApplicationView {
func display(feedback: ApplicationFeedback) {
switch feedback {
case .success(let city, let forecast):
print("Success: \(city) forecast is \(forecast)")
case .failure(let city):
print("Failure: \(city) forecast is not available")
}
}
}
class WeatherApplicationPresenter {
private let application: WeatherApplicationProtocol
private let view: WeatherApplicationView
init(application: WeatherApplicationProtocol, view: WeatherApplicationView) {
self.application = application
self.view = view
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
view.display(feedback: feedback)
}
}
protocol WeatherApplicationBuilder {
func build() -> WeatherApplicationPresenter
}
class WeatherApplicationBuilderImpl: WeatherApplicationBuilder {
func build() -> WeatherApplicationPresenter {
let provider = WeatherProviderImpl()
let application = WeatherApplication(provider: provider)
let view = WeatherApplicationViewImpl()
return WeatherApplicationPresenter(application: application, view: view)
}
}
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
return "cloudy"
}
}
class WeatherApplicationEntryPoint {
private let builder: WeatherApplicationBuilder
init(builder: WeatherApplicationBuilder) {
self.builder = builder
}
func run() {
let presenter = builder.build()
presenter.handle(action: .keyboardCharacterSelect("P"))
presenter.handle(action: .keyboardCharacterSelect("a"))
presenter.handle(action: .keyboardCharacterSelect("r"))
presenter.handle(action: .keyboardCharacterSelect("i"))
presenter.handle(action: .searchButtonPress)
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: character.description, forecast: "")
case .keyboardDeleteBackwards:
return nil
case .searchButtonPress:
return .success(city: "Paris", forecast: "cloudy")
}
}
}
protocol WeatherApplicationView {
func display(feedback: ApplicationFeedback)
}
// Weather application view.
// Display feedback from WeatherApplication.
class WeatherApplicationViewImpl: WeatherApplicationView {
func display(feedback: ApplicationFeedback) {
switch feedback {
case .success(let city, let forecast):
print("Success: \(city) forecast is \(forecast)")
case .failure(let city):
print("Failure: \(city) forecast is not available")
}
}
}
// Weather application presenter.
// Handle user actions and display feedback to WeatherApplicationView.
class WeatherApplicationPresenter {
private let application: WeatherApplicationProtocol
private let view: WeatherApplicationView
init(application: WeatherApplicationProtocol, view: WeatherApplicationView) {
self.application = application
self.view = view
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
view.display(feedback: feedback)
}
}
protocol WeatherApplicationBuilder {
func build() -> WeatherApplicationPresenter
}
// Weather application builder.
// Build WeatherApplication, WeatherApplicationView, WeatherApplicationPresenter.
class WeatherApplicationBuilderImpl: WeatherApplicationBuilder {
func build() -> WeatherApplicationPresenter {
let provider = WeatherProviderImpl()
let application = WeatherApplication(provider: provider)
let view = WeatherApplicationViewImpl()
return WeatherApplicationPresenter(application: application, view: view)
}
}
// Weather provider implementation.
// Return forecast for a city.
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
return "cloudy"
}
}
// Weather application entry point.
// Build WeatherApplication, WeatherApplicationView, WeatherApplicationPresenter and handle user actions.
class WeatherApplicationEntryPoint {
private let builder: WeatherApplicationBuilder
init(builder: WeatherApplicationBuilder) {
self.builder = builder
}
func run() {
let presenter = builder.build()
presenter.handle(action: .keyboardCharacterSelect("P"))
presenter.handle(action: .keyboardCharacterSelect("a"))
presenter.handle(action: .keyboardCharacterSelect("r"))
presenter.handle(action: .keyboardCharacterSelect("i"))
presenter.handle(action: .searchButtonPress)
}
}
let builder = WeatherApplicationBuilderImpl()
let entryPoint = WeatherApplicationEntryPoint(builder: builder)
entryPoint.run()
``` // XCTAssertNil failed: expression is not nilprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
private var searchResults = [String]()
private var searchBarText = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return handleKeyboardCharacterSelect(character)
case .keyboardDeleteBackwards:
return handleKeyboardDeleteBackwards()
case .searchButtonPress:
return handleSearchButtonPress()
}
}
private func handleKeyboardCharacterSelect(_ character: Character) -> ApplicationFeedback? {
let newText = searchBarText + String(character)
if newText.isEmpty {
// Clear search results.
searchResults.removeAll()
return nil
}
let newSearchResults = searchResults.filter { $0.hasPrefix(newText) }
if newSearchResults.isEmpty {
return ApplicationFeedback.failure(city: newText)
}
searchResults = newSearchResults
searchBarText = newText
return nil
}
private func handleKeyboardDeleteBackwards() -> ApplicationFeedback? {
let newText = String(searchBarText.dropLast())
if newText.isEmpty {
// Clear search results.
searchResults.removeAll()
return nil
}
let newSearchResults = searchResults.filter { $0.hasPrefix(newText) }
if newSearchResults.isEmpty {
return ApplicationFeedback.failure(city: newText)
}
searchResults = newSearchResults
searchBarText = newText
return nil
}
private func handleSearchButtonPress() -> ApplicationFeedback? {
guard let city = searchResults.first else { return nil }
do {
let forecast = try provider.forecast(for: city)
return ApplicationFeedback.success(city: city, forecast: forecast)
} catch {
return ApplicationFeedback.failure(city: city)
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
private var searchResults = [String]()
private var searchBarText = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return handleKeyboardCharacterSelect(character)
case .keyboardDeleteBackwards:
return handleKeyboardDeleteBackwards()
case .searchButtonPress:
return handleSearchButtonPress()
}
}
private func handleKeyboardCharacterSelect(_ character: Character) -> ApplicationFeedback? {
let newText = searchBarText + String(character)
if newText.isEmpty {
// Clear search results.
searchResults.removeAll()
return nil
}
let newSearchResults = searchResults.filter { $0.hasPrefix(newText) }
if newSearchResults.isEmpty {
return ApplicationFeedback.failure(city: newText)
}
searchResults = newSearchResults
searchBarText = newText
return nil
}
private func handleKeyboardDeleteBackwards() -> ApplicationFeedback? {
let newText = String(searchBarText.dropLast())
if newText.isEmpty {
// Clear search results.
searchResults.removeAll()
return nil
}
let newSearchResults = searchResults.filter { $0.hasPrefix(newText) }
if newSearchResults.isEmpty {
return ApplicationFeedback.failure(city: newText)
}
searchResults = newSearchResults
searchBarText = newText
return nil
}
private func handleSearchButtonPress() -> ApplicationFeedback? {
guard let city = searchResults.first else { return nil }
do {
let forecast = try provider.forecast(for: city)
return ApplicationFeedback.success(city: city, forecast: forecast)
} catch {
return ApplicationFeedback.failure(city: city)
}
}
}
``` // XCTAssertNil failed: expression is not nilprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double
private var lock: AsyncMutex
init(balance: Double) {
_balance = balance
lock = AsyncMutex()
}
var balance: Double {
get async {
await lock.lock()
defer { await lock.unlock() }
return _balance
}
}
func deposit(amount: Double) async {
await lock.lock()
defer { await lock.unlock() }
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
await lock.lock()
defer { await lock.unlock() }
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
class NonActorBankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get { return _balance }
}
func deposit(amount: Double) {
_balance += amount
}
func withdraw(amount: Double) -> Bool {
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
struct StructBankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get { return _balance }
}
func deposit(amount: Double) {
_balance += amount
}
func withdraw(amount: Double) -> Bool {
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
class ClassBankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get { return _balance }
}
func deposit(amount: Double) {
_balance += amount
}
func withdraw(amount: Double) -> Bool {
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double
private var lock: AsyncMutex
init(balance: Double) {
_balance = balance
lock = AsyncMutex()
}
var balance: Double {
get async {
await lock.lock()
defer { await lock.unlock() }
return _balance
}
}
func deposit(amount: Double) async {
await lock.lock()
defer { await lock.unlock() }
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
await lock.lock()
defer { await lock.unlock() }
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
// BankAccountProtocol implementation using a non-actor class that allows synchronous deposits and withdrawals, but does not guarantee thread safety or atomicity.
class NonActorBankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get { return _balance }
}
func deposit(amount: Double) {
_balance += amount
}
func withdraw(amount: Double) -> Bool {
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
// BankAccountProtocol implementation using a struct that allows synchronous deposits and withdrawals, but does not guarantee thread safety or atomicity.
struct StructBankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get { return _balance }
}
func deposit(amount: Double) {
_balance += amount
}
func withdraw(amount: Double) -> Bool {
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
// BankAccountProtocol implementation using a class that allows synchronous deposits and withdrawals, but does not guarantee thread safety or atomicity.
class ClassBankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get { return _balance }
}
func deposit(amount: Double) {
_balance += amount
}
func withdraw(amount: Double) -> Bool {
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
// BankAccountProtocol implementation using a struct that allows synchronous deposits and withdrawals, but does not guarantee thread safety or atomicity.
struct StructBankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get { return _balance }
}
func deposit(amount: Double) {
_balance += amount
}
func withdraw(amount: Double) -> Bool {
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
// BankAccountProtocol implementation using a class that allows synchronous deposits and withdrawals, but does not guarantee thread safety or atomicity.
class ClassBankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get { return _balance }
}
func deposit(amount: Double) {
_balance += amount
}
func withdraw(amount: Double) -> Bool {
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
// BankAccountProtocol implementation using a class that allows synchronous deposits and withdrawals, but does not guarantee thread safety or atomicity.
class ClassBankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get { return _balance }
}
func deposit(amount: Double) {
_balance += amount
}
func withdraw(amount: Double) -> Bool {
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
// BankAccountProtocol implementation using a class that allows synchronous deposits and withdrawals, but does not guarantee thread safety orprivate var lock: AsyncMutex // cannot find type 'AsyncMutex' in scopelock = AsyncMutex() // cannot find 'AsyncMutex' in scopeinit(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'NonActorBankAccount'_balance += amount // left side of mutating operator isn't mutable: 'self' is immutable_balance -= amount // left side of mutating operator isn't mutable: 'self' is immutableinit(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'ClassBankAccount'protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double = 0.0
required init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
await withUnsafeContinuation { continuation in
Task.detached {
continuation.resume(returning: _balance)
}
}
}
}
func deposit(amount: Double) async {
await withUnsafeContinuation { continuation in
Task.detached {
_balance += amount
continuation.resume()
}
}
}
func withdraw(amount: Double) async -> Bool {
guard _balance >= amount else { return false }
await withUnsafeContinuation { continuation in
Task.detached {
_balance -= amount
continuation.resume()
}
}
return true
}
}
class BankAccount2: BankAccountProtocol {
private var _balance: Double = 0.0
private let lock = NSLock()
required init(balance: Double) {
_balance = balance
}
var balance: Double {
get {
lock.lock()
defer { lock.unlock() }
return _balance
}
}
func deposit(amount: Double) {
lock.lock()
defer { lock.unlock() }
_balance += amount
}
func withdraw(amount: Double) -> Bool {
lock.lock()
defer { lock.unlock() }
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
class BankAccount3: BankAccountProtocol {
private var _balance: Double = 0.0
private let semaphore = DispatchSemaphore(value: 1)
required init(balance: Double) {
_balance = balance
}
var balance: Double {
get {
semaphore.wait()
defer { semaphore.signal() }
return _balance
}
}
func deposit(amount: Double) {
semaphore.wait()
defer { semaphore.signal() }
_balance += amount
}
func withdraw(amount: Double) -> Bool {
semaphore.wait()
defer { semaphore.signal() }
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
class BankAccount4: BankAccountProtocol {
private var _balance: Double = 0.0
private let mutex = pthread_mutex_t()
required init(balance: Double) {
_balance = balance
pthread_mutex_init(&mutex, nil)
}
var balance: Double {
get {
pthread_mutex_lock(&mutex)
defer { pthread_mutex_unlock(&mutex) }
return _balance
}
}
func deposit(amount: Double) {
pthread_mutex_lock(&mutex)
defer { pthread_mutex_unlock(&mutex) }
_balance += amount
}
func withdraw(amount: Double) -> Bool {
pthread_mutex_lock(&mutex)
defer { pthread_mutex_unlock(&mutex) }
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double = 0.0
required init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
await withUnsafeContinuation { continuation in
Task.detached {
continuation.resume(returning: _balance)
}
}
}
}
func deposit(amount: Double) async {
await withUnsafeContinuation { continuation in
Task.detached {
_balance += amount
continuation.resume()
}
}
}
func withdraw(amount: Double) async -> Bool {
guard _balance >= amount else { return false }
await withUnsafeContinuation { continuation in
Task.detached {
_balance -= amount
continuation.resume()
}
}
return true
}
}
// Bank account class using a lock that allows synchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount2: BankAccountProtocol {
private var _balance: Double = 0.0
private let lock = NSLock()
required init(balance: Double) {
_balance = balance
}
var balance: Double {
get {
lock.lock()
defer { lock.unlock() }
return _balance
}
}
func deposit(amount: Double) {
lock.lock()
defer { lock.unlock() }
_balance += amount
}
func withdraw(amount: Double) -> Bool {
lock.lock()
defer { lock.unlock() }
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
// Bank account class using a semaphore that allows concurrent deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount3: BankAccountProtocol {
private var _balance: Double = 0.0
private let semaphore = DispatchSemaphore(value: 1)
required init(balance: Double) {
_balance = balance
}
var balance: Double {
get {
semaphore.wait()
defer { semaphore.signal() }
return _balance
}
}
func deposit(amount: Double) {
semaphore.wait()
defer { semaphore.signal() }
_balance += amount
}
func withdraw(amount: Double) -> Bool {
semaphore.wait()
defer { semaphore.signal() }
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
// Bank account class using a mutex that allows concurrent deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount4: BankAccountProtocol {
private var _balance: Double = 0.0
private let mutex = pthread_mutex_t()
required init(balance: Double) {
_balance = balance
pthread_mutex_init(&mutex, nil)
}
var balance: Double {
get {
pthread_mutex_lock(&mutex)
defer { pthread_mutex_unlock(&mutex) }
return _balance
}
}
func deposit(amount: Double) {
pthread_mutex_lock(&mutex)
defer { pthread_mutex_unlock(&mutex) }
_balance += amount
}
func withdraw(amount: Double) -> Bool {
pthread_mutex_lock(&mutex)
defer { pthread_mutex_unlock(&mutex) }
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
// Bank account class using a condition variable that allows concurrent deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount5: BankAccountProtocol {
private var _balance: Double = 0.0
private let condition = pthread_cond_t()
private let mutex = pthread_mutex_t()
required init(balance: Double) {
_balance = balance
pthread_cond_init(&condition, nil)
pthread_mutex_init(&mutex, nil)
}
var balance: Double {
get {
pthread_mutex_lock(&mutex)
defer { pthread_mutex_unlock(&mutex) }
return _balance
}
}
func deposit(amount: Double) {
required init(balance: Double) { // 'required' initializer in non-class type 'BankAccount'continuation.resume(returning: _balance) // reference to property '_balance' in closure requires explicit use of 'self' to make capture semantics explicitcontinuation.resume(returning: _balance) // expression is 'async' but is not marked with 'await'_balance += amount // reference to property '_balance' in closure requires explicit use of 'self' to make capture semantics explicit_balance += amount // actor-isolated property '_balance' can not be mutated from a Sendable closure_balance -= amount // reference to property '_balance' in closure requires explicit use of 'self' to make capture semantics explicit_balance -= amount // actor-isolated property '_balance' can not be mutated from a Sendable closurepthread_mutex_lock(&mutex) // cannot pass immutable value as inout argument: 'mutex' is a 'let' constantdefer { pthread_mutex_unlock(&mutex) } // cannot pass immutable value as inout argument: 'mutex' is a 'let' constantpthread_mutex_lock(&mutex) // cannot pass immutable value as inout argument: 'mutex' is a 'let' constantdefer { pthread_mutex_unlock(&mutex) } // cannot pass immutable value as inout argument: 'mutex' is a 'let' constantpthread_mutex_lock(&mutex) // cannot pass immutable value as inout argument: 'mutex' is a 'let' constantdefer { pthread_mutex_unlock(&mutex) } // cannot pass immutable value as inout argument: 'mutex' is a 'let' constantprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
await _balance += amount
}
func withdraw(amount: Double) async -> Bool {
if await _balance < amount {
return false
}
await _balance -= amount
return true
}
}
class BankAccountLock: BankAccountProtocol {
private var _balance: Double
private let lock = NSLock()
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
lock.lock()
defer {
lock.unlock()
}
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
lock.lock()
defer {
lock.unlock()
}
if _balance < amount {
return false
}
_balance -= amount
return true
}
}
class BankAccountSemaphore: BankAccountProtocol {
private var _balance: Double
private let semaphore = DispatchSemaphore(value: 1)
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
semaphore.wait()
defer {
semaphore.signal()
}
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
semaphore.wait()
defer {
semaphore.signal()
}
if _balance < amount {
return false
}
_balance -= amount
return true
}
}
class BankAccountQueue: BankAccountProtocol {
private var _balance: Double
private let queue = DispatchQueue(label: "com.example.BankAccountQueue")
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
queue.async {
_balance += amount
}
}
func withdraw(amount: Double) async -> Bool {
queue.sync {
if _balance < amount {
return false
}
_balance -= amount
return true
}
}
}
class BankAccountLock2: BankAccountProtocol {
private var _balance: Double
private let lock = NSLock()
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
lock.lock()
defer {
lock.unlock()
}
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
lock.lock()
defer {
lock.unlock()
}
if _balance < amount {
return false
}
_balance -= amount
return true
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
await _balance += amount
}
func withdraw(amount: Double) async -> Bool {
if await _balance < amount {
return false
}
await _balance -= amount
return true
}
}
// A bank account class that uses a lock for thread-safety.
class BankAccountLock: BankAccountProtocol {
private var _balance: Double
private let lock = NSLock()
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
lock.lock()
defer {
lock.unlock()
}
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
lock.lock()
defer {
lock.unlock()
}
if _balance < amount {
return false
}
_balance -= amount
return true
}
}
// A bank account class that uses a semaphore for thread-safety.
class BankAccountSemaphore: BankAccountProtocol {
private var _balance: Double
private let semaphore = DispatchSemaphore(value: 1)
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
semaphore.wait()
defer {
semaphore.signal()
}
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
semaphore.wait()
defer {
semaphore.signal()
}
if _balance < amount {
return false
}
_balance -= amount
return true
}
}
// A bank account class that uses a queue for thread-safety.
class BankAccountQueue: BankAccountProtocol {
private var _balance: Double
private let queue = DispatchQueue(label: "com.example.BankAccountQueue")
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
queue.async {
_balance += amount
}
}
func withdraw(amount: Double) async -> Bool {
queue.sync {
if _balance < amount {
return false
}
_balance -= amount
return true
}
}
}
// A bank account class that uses a lock for thread-safety.
class BankAccountLock2: BankAccountProtocol {
private var _balance: Double
private let lock = NSLock()
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
lock.lock()
defer {
lock.unlock()
}
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
lock.lock()
defer {
lock.unlock()
}
if _balance < amount {
return false
}
_balance -= amount
return true
}
}
// A bank account class that uses a semaphore for thread-safety.
class BankAccountSemaphore2: BankAccountProtocol {
private var _balance: Double
private let semaphore = DispatchSemaphore(value: 1)
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
semaphore.wait()
defer {
semaphore.signal()
}
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
semaphore.wait()
defer {
semaphore.signal()
}
if _balance < amount {
return false
}
await _balance += amount // no 'async' operations occur within 'await' expressionif await _balance < amount { // no 'async' operations occur within 'await' expressionawait _balance -= amount // no 'async' operations occur within 'await' expressioninit(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccountLock'lock.lock() // instance method 'lock' is unavailable from asynchronous contexts; Use async-safe scoped locking instead; this is an error in Swift 6lock.lock() // instance method 'lock' is unavailable from asynchronous contexts; Use async-safe scoped locking instead; this is an error in Swift 6init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccountSemaphore'semaphore.wait() // instance method 'wait' is unavailable from asynchronous contexts; Await a Task handle instead; this is an error in Swift 6semaphore.wait() // instance method 'wait' is unavailable from asynchronous contexts; Await a Task handle instead; this is an error in Swift 6init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccountQueue'_balance += amount // reference to property '_balance' in closure requires explicit use of 'self' to make capture semantics explicitinit(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccountLock2'lock.lock() // instance method 'lock' is unavailable from asynchronous contexts; Use async-safe scoped locking instead; this is an error in Swift 6lock.lock() // instance method 'lock' is unavailable from asynchronous contexts; Use async-safe scoped locking instead; this is an error in Swift 6protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
class BankAccount2: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
class BankAccount3: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
class BankAccount4: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
class BankAccount5: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
class BankAccount6: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
class BankAccount7: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
class BankAccount8: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount2: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount3: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount4: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount5: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount6: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount7: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount8: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else {
return false
}
balance -= amount
return true
}
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount9: BankAccountProtocol {
var balance: Double
init(balance: Double) {
init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount2'init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount3'init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount4'init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount5'init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount6'init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount7'init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount8'protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
var balance: Double {
get async {
await balanceSemaphore.wait()
defer { balanceSemaphore.signal() }
return _balance
}
}
private var _balance: Double
private let balanceSemaphore = DispatchSemaphore(value: 1)
init(balance: Double) {
_balance = balance
}
func deposit(amount: Double) async {
await balanceSemaphore.wait()
defer { balanceSemaphore.signal() }
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
await balanceSemaphore.wait()
defer { balanceSemaphore.signal() }
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
actor BankAccountManager {
private var accounts: [BankAccount] = []
func addAccount(account: BankAccount) {
accounts.append(account)
}
func deposit(to account: BankAccount, amount: Double) async {
await account.deposit(amount: amount)
}
func withdraw(from account: BankAccount, amount: Double) async -> Bool {
return await account.withdraw(amount: amount)
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
var balance: Double {
get async {
await balanceSemaphore.wait()
defer { balanceSemaphore.signal() }
return _balance
}
}
private var _balance: Double
private let balanceSemaphore = DispatchSemaphore(value: 1)
init(balance: Double) {
_balance = balance
}
func deposit(amount: Double) async {
await balanceSemaphore.wait()
defer { balanceSemaphore.signal() }
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
await balanceSemaphore.wait()
defer { balanceSemaphore.signal() }
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
// BankAccountManager class that provides a way to manage multiple bank accounts and perform various operations on them, such as depositing and withdrawing funds, while ensuring thread safety and avoiding race conditions using actors.
actor BankAccountManager {
private var accounts: [BankAccount] = []
func addAccount(account: BankAccount) {
accounts.append(account)
}
func deposit(to account: BankAccount, amount: Double) async {
await account.deposit(amount: amount)
}
func withdraw(from account: BankAccount, amount: Double) async -> Bool {
return await account.withdraw(amount: amount)
}
}
```await balanceSemaphore.wait() // no 'async' operations occur within 'await' expressionawait balanceSemaphore.wait() // instance method 'wait' is unavailable from asynchronous contexts; Await a Task handle instead; this is an error in Swift 6await balanceSemaphore.wait() // no 'async' operations occur within 'await' expressionawait balanceSemaphore.wait() // instance method 'wait' is unavailable from asynchronous contexts; Await a Task handle instead; this is an error in Swift 6await balanceSemaphore.wait() // instance method 'wait' is unavailable from asynchronous contexts; Await a Task handle instead; this is an error in Swift 6await balanceSemaphore.wait() // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double
public var balance: Double {
get async {
return await _balance
}
}
public init(balance: Double) {
_balance = balance
}
public func deposit(amount: Double) async {
await self.lock()
defer {
self.unlock()
}
_balance += amount
}
public func withdraw(amount: Double) async -> Bool {
await self.lock()
defer {
self.unlock()
}
if amount <= _balance {
_balance -= amount
return true
}
return false
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double
public var balance: Double {
get async {
return await _balance
}
}
public init(balance: Double) {
_balance = balance
}
public func deposit(amount: Double) async {
await self.lock()
defer {
self.unlock()
}
_balance += amount
}
public func withdraw(amount: Double) async -> Bool {
await self.lock()
defer {
self.unlock()
}
if amount <= _balance {
_balance -= amount
return true
}
return false
}
}
// Example usage:
let bankAccount = BankAccount(balance: 1000.0)
// Deposit money
Task {
await bankAccount.deposit(amount: 500.0)
print("Deposited $500.0")
}
// Withdraw money
Task {
if await bankAccount.withdraw(amount: 200.0) {
print("Withdrew $200.0")
} else {
print("Insufficient funds")
}
}
```return await _balance // no 'async' operations occur within 'await' expressionawait self.lock() // value of type 'BankAccount' has no member 'lock'self.unlock() // value of type 'BankAccount' has no member 'unlock'await self.lock() // value of type 'BankAccount' has no member 'lock'self.unlock() // value of type 'BankAccount' has no member 'unlock'protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double = 0.0
init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
await withUnsafeContinuation { continuation in
DispatchQueue.global().async {
continuation.resume(returning: self._balance)
}
}
}
}
func deposit(amount: Double) async {
await withUnsafeContinuation { continuation in
DispatchQueue.global().async {
self._balance += amount
continuation.resume()
}
}
}
func withdraw(amount: Double) async -> Bool {
await withUnsafeContinuation { continuation in
DispatchQueue.global().async {
if self._balance >= amount {
self._balance -= amount
continuation.resume(returning: true)
} else {
continuation.resume(returning: false)
}
}
}
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double = 0.0
init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
await withUnsafeContinuation { continuation in
DispatchQueue.global().async {
continuation.resume(returning: self._balance)
}
}
}
}
func deposit(amount: Double) async {
await withUnsafeContinuation { continuation in
DispatchQueue.global().async {
self._balance += amount
continuation.resume()
}
}
}
func withdraw(amount: Double) async -> Bool {
await withUnsafeContinuation { continuation in
DispatchQueue.global().async {
if self._balance >= amount {
self._balance -= amount
continuation.resume(returning: true)
} else {
continuation.resume(returning: false)
}
}
}
}
}
// Example usage of the BankAccount class:
let account = BankAccount(balance: 1000.0)
Task {
let balance = await account.balance
print("Current balance: \(balance)")
await account.deposit(amount: 500.0)
print("Deposited $500")
let success = await account.withdraw(amount: 2000.0)
if success {
print("Withdrew $2000")
} else {
print("Insufficient funds")
}
let newBalance = await account.balance
print("New balance: \(newBalance)")
}
```continuation.resume(returning: self._balance) // actor-isolated property '_balance' can not be referenced from a Sendable closure; this is an error in Swift 6self._balance += amount // actor-isolated property '_balance' can not be mutated from a Sendable closure; this is an error in Swift 6if self._balance >= amount { // actor-isolated property '_balance' can not be referenced from a Sendable closure; this is an error in Swift 6self._balance -= amount // actor-isolated property '_balance' can not be mutated from a Sendable closure; this is an error in Swift 6 // XCTAssertEqual failed: (1031.0) is not equal to (1000.0)protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
await _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard _balance >= amount else {
return false
}
_balance -= amount
return true
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
await _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard _balance >= amount else {
return false
}
_balance -= amount
return true
}
}
// Example usage:
let account = BankAccount(balance: 1000.0)
let task1 = Task {
await account.deposit(amount: 500.0)
print("Task 1: Deposited 500.0")
}
let task2 = Task {
let success = await account.withdraw(amount: 200.0)
if success {
print("Task 2: Withdrew 200.0")
} else {
print("Task 2: Insufficient balance")
}
}
```await _balance // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double = 0.0
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > _balance {
return false
}
_balance -= amount
return true
}
}
@MainActor
class BankAccount2 {
var balance: Double = 0.0
func deposit(amount: Double) {
balance += amount
}
func withdraw(amount: Double) -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
@MainActor
class BankAccount3 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
@MainActor
class BankAccount4 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
@MainActor
class BankAccount5 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
@MainActor
class BankAccount6 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
@MainActor
class BankAccount7 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
@MainActor
class BankAccount8 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
@MainActor
class BankAccount9 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double = 0.0
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > _balance {
return false
}
_balance -= amount
return true
}
}
// A class representing a bank account that can be accessed by multiple threads using the @MainActor annotation.
@MainActor
class BankAccount2 {
var balance: Double = 0.0
func deposit(amount: Double) {
balance += amount
}
func withdraw(amount: Double) -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
// A class representing a bank account that can be accessed by multiple threads using the @MainActor annotation.
@MainActor
class BankAccount3 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
// A class representing a bank account that can be accessed by multiple threads using the @MainActor annotation.
@MainActor
class BankAccount4 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
// A class representing a bank account that can be accessed by multiple threads using the @MainActor annotation.
@MainActor
class BankAccount5 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
// A class representing a bank account that can be accessed by multiple threads using the @MainActor annotation.
@MainActor
class BankAccount6 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
// A class representing a bank account that can be accessed by multiple threads using the @MainActor annotation.
@MainActor
class BankAccount7 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
// A class representing a bank account that can be accessed by multiple threads using the @MainActor annotation.
@MainActor
class BankAccount8 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
// A class representing a bank account that can be accessed by multiple threads using the @MainActor annotation.
@MainActor
class BankAccount9 {
var balance: Double = 0.0
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
// A class representing a bank account that can be accessed by multiple threads using the @MainActor annotation.
@MainActor
class BankAccount10 {
var balance: Double = 0.0
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double = 0.0
// Initializer for the bank account with a specified initial balance.
init(balance: Double) {
self._balance = balance
}
// Getter for the balance of the bank account.
var balance: Double {
get async {
await self._balance
}
}
// Function to deposit a specified amount into the bank account.
func deposit(amount: Double) async {
self._balance += amount
}
// Function to withdraw a specified amount from the bank account.
// Returns true if the withdrawal was successful, or false if the account balance is insufficient.
func withdraw(amount: Double) async -> Bool {
guard amount <= self._balance else {
return false
}
self._balance -= amount
return true
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double = 0.0
// Initializer for the bank account with a specified initial balance.
init(balance: Double) {
self._balance = balance
}
// Getter for the balance of the bank account.
var balance: Double {
get async {
await self._balance
}
}
// Function to deposit a specified amount into the bank account.
func deposit(amount: Double) async {
self._balance += amount
}
// Function to withdraw a specified amount from the bank account.
// Returns true if the withdrawal was successful, or false if the account balance is insufficient.
func withdraw(amount: Double) async -> Bool {
guard amount <= self._balance else {
return false
}
self._balance -= amount
return true
}
}
// Example usage of the BankAccount class
// Create a new bank account with an initial balance of $100
let bankAccount = BankAccount(balance: 100)
// Print the initial balance of the bank account
print("Initial balance: \(await bankAccount.balance)")
// Deposit $50 into the bank account
await bankAccount.deposit(amount: 50)
// Print the updated balance of the bank account after the deposit
print("Updated balance: \(await bankAccount.balance)")
// Attempt to withdraw $150 from the bank account
let withdrawSuccess = await bankAccount.withdraw(amount: 150)
// Print the result of the withdrawal attempt and the updated balance of the bank account
print("Withdraw success: \(withdrawSuccess)")
print("Updated balance: \(await bankAccount.balance)")
```await self._balance // no 'async' operations occur within 'await' expressionprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
@propertyWrapper
struct Cached2<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
@propertyWrapper
struct Cached3<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
@propertyWrapper
struct Cached4<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
@propertyWrapper
struct Cached5<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
@propertyWrapper
struct Cached6<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
@propertyWrapper
struct Cached7<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached2<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached3<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached4<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached5<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached6<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached7<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached8<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
initstruct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutablestruct Cached2<Value>: CachedProperty { // property wrapper type 'Cached2' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutablestruct Cached3<Value>: CachedProperty { // property wrapper type 'Cached3' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutablestruct Cached4<Value>: CachedProperty { // property wrapper type 'Cached4' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutablestruct Cached5<Value>: CachedProperty { // property wrapper type 'Cached5' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutablestruct Cached6<Value>: CachedProperty { // property wrapper type 'Cached6' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutablestruct Cached7<Value>: CachedProperty { // property wrapper type 'Cached7' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: () -> Bool
private var wrappedValue: @autoclosure @escaping () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var projectedValue: Cached<Value> { self }
var wrappedValue: Value {
get {
if condition() {
value = self.wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: () -> Bool
private var wrappedValue: @autoclosure @escaping () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var projectedValue: Cached<Value> { self }
var wrappedValue: Value {
get {
if condition() {
value = self.wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: () -> Bool
private var wrappedValue: @autoclosure @escaping () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var projectedValue: Cached<Value> { self }
var wrappedValue: Value {
get {
if condition() {
value = self.wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
```struct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'private var wrappedValue: @autoclosure @escaping () -> Value // '@autoclosure' may only be used on parametersself.wrappedValue = wrappedValue // function produces expected type 'Value'; did you mean to call it with '()'?value = self.wrappedValue() // cannot call value of non-function type 'Value'value = self.wrappedValue() // cannot assign to property: 'self' is immutableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
typealias Value = Value
var wrappedValue: Value
var condition: () -> Bool
var value: Value {
if condition() {
wrappedValue = wrappedValue()
}
return wrappedValue
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
}
@propertyWrapper
struct CachedOptional<Value: OptionalProtocol>: CachedProperty {
typealias Value = Value
var wrappedValue: Value
var condition: () -> Bool
var value: Value {
if condition() {
wrappedValue = wrappedValue()
}
return wrappedValue
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
typealias Value = Value
var wrappedValue: Value
var condition: () -> Bool
var value: Value {
if condition() {
wrappedValue = wrappedValue()
}
return wrappedValue
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct CachedOptional<Value: OptionalProtocol>: CachedProperty {
typealias Value = Value
var wrappedValue: Value
var condition: () -> Bool
var value: Value {
if condition() {
wrappedValue = wrappedValue()
}
return wrappedValue
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
}
```wrappedValue = wrappedValue() // cannot assign to property: 'self' is immutablewrappedValue = wrappedValue() // cannot call value of non-function type 'Value'self.wrappedValue = wrappedValue // function produces expected type 'Value'; did you mean to call it with '()'?struct CachedOptional<Value: OptionalProtocol>: CachedProperty { // cannot find type 'OptionalProtocol' in scopewrappedValue = wrappedValue() // cannot assign to property: 'self' is immutablewrappedValue = wrappedValue() // cannot call value of non-function type 'Value'self.wrappedValue = wrappedValue // function produces expected type 'Value'; did you mean to call it with '()'?protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
typealias Value = Value
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = nil
}
if let value = value {
return value
} else {
value = wrappedValue
return value!
}
}
}
@propertyWrapper
struct CachedLazy<Value>: CachedProperty {
typealias Value = Value
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if condition() {
value = nil
}
if let value = value {
return value
} else {
value = wrappedValue()
return value!
}
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
typealias Value = Value
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = nil
}
if let value = value {
return value
} else {
value = wrappedValue
return value!
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct CachedLazy<Value>: CachedProperty {
typealias Value = Value
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if condition() {
value = nil
}
if let value = value {
return value
} else {
value = wrappedValue()
return value!
}
}
}
```value = nil // cannot assign to property: 'self' is immutablevalue = wrappedValue // cannot assign to property: 'self' is immutablestruct CachedLazy<Value>: CachedProperty { // property wrapper type 'CachedLazy' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = nil // cannot assign to property: 'self' is immutablevalue = wrappedValue() // cannot assign to property: 'self' is immutableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value ?? wrappedValue()
}
set {
value = newValue
}
}
}
@propertyWrapper
struct Cached<Value, Key: Hashable>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
private let key: Key
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool, key: Key) {
self.condition = condition
self.wrappedValue = wrappedValue
self.key = key
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value ?? wrappedValue()
}
set {
value = newValue
}
}
}
@propertyWrapper
struct Cached<Value, Key: Hashable, Key2: Hashable>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
private let key: Key
private let key2: Key2
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool, key: Key, key2: Key2) {
self.condition = condition
self.wrappedValue = wrappedValue
self.key = key
self.key2 = key2
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value ?? wrappedValue()
}
set {
value = newValue
}
}
}
@propertyWrapper
struct Cached<Value, Key: Hashable, Key2: Hashable, Key3: Hashable>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
private let key: Key
private let key2: Key2
private let key3: Key3
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool, key: Key, key2: Key2, key3: Key3) {
self.condition = condition
self.wrappedValue = wrappedValue
self.key = key
self.key2 = key2
self.key3 = key3
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value ?? wrappedValue()
}
set {
value = newValue
}
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value ?? wrappedValue()
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value, Key: Hashable>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
private let key: Key
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool, key: Key) {
self.condition = condition
self.wrappedValue = wrappedValue
self.key = key
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value ?? wrappedValue()
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value, Key: Hashable, Key2: Hashable>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
private let key: Key
private let key2: Key2
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool, key: Key, key2: Key2) {
self.condition = condition
self.wrappedValue = wrappedValue
self.key = key
self.key2 = key2
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value ?? wrappedValue()
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value, Key: Hashable, Key2: Hashable, Key3: Hashable>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
private let key: Key
private let key2: Key2
private let key3: Key3
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool, key: Key, key2: Key2, key3: Key3) {
self.condition = condition
self.wrappedValue = wrappedValue
self.key = key
self.key2 = key2
self.key3 = key3
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value ?? wrappedValue()
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value, Key: Hashable, Key2: Hashable, Key3: Hashable, Key4: Hashable>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
private let key: Key
private let key2: Key2
private let key3: Key3
private let key4: Key4
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool, key: Key, key2: Key2, key3: Key3, key4: Key4) {
self.condition = condition
self.wrappedValue = wrappedValue
self.key = key
self.key2 = key2
self.key3 = key3
self.key4 = key4
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
struct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutablestruct Cached<Value, Key: Hashable>: CachedProperty { // invalid redeclaration of 'Cached'struct Cached<Value, Key: Hashable>: CachedProperty { // type 'Cached<Value, Key>' does not conform to protocol 'CachedProperty'struct Cached<Value, Key: Hashable>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutablestruct Cached<Value, Key: Hashable, Key2: Hashable>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'struct Cached<Value, Key: Hashable, Key2: Hashable>: CachedProperty { // type 'Cached<Value, Key, Key2>' does not conform to protocol 'CachedProperty'struct Cached<Value, Key: Hashable, Key2: Hashable>: CachedProperty { // invalid redeclaration of 'Cached'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutablestruct Cached<Value, Key: Hashable, Key2: Hashable, Key3: Hashable>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'struct Cached<Value, Key: Hashable, Key2: Hashable, Key3: Hashable>: CachedProperty { // invalid redeclaration of 'Cached'struct Cached<Value, Key: Hashable, Key2: Hashable, Key3: Hashable>: CachedProperty { // type 'Cached<Value, Key, Key2, Key3>' does not conform to protocol 'CachedProperty'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutablevar condition = false // variable 'condition' was written to, but never read@Cached(condition: { condition }) // 'Cached' is ambiguous for type lookup in this contextvar cached: Int = { // variable 'cached' was never mutated; consider changing to 'let' constantprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: Bool
private let compute: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition()
self.compute = wrappedValue
}
var wrappedValue: Value {
get {
if condition {
value = compute()
}
return value!
}
set {
value = newValue
}
}
}
@propertyWrapper
struct Cached<Value, Condition: Equatable>: CachedProperty {
private var value: Value?
private var condition: Condition
private let compute: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Condition) {
self.condition = condition()
self.compute = wrappedValue
}
var wrappedValue: Value {
get {
if condition != self.condition {
value = compute()
self.condition = condition()
}
return value!
}
set {
value = newValue
}
}
}
struct Test {
@Cached(condition: { true })
var value: Int {
print("Computing value")
return 42
}
@Cached(condition: { false })
var value2: Int {
print("Computing value")
return 42
}
@Cached(condition: { true })
var value3: Int {
print("Computing value")
return 42
}
@Cached(condition: { false })
var value4: Int {
print("Computing value")
return 42
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: Bool
private let compute: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition()
self.compute = wrappedValue
}
var wrappedValue: Value {
get {
if condition {
value = compute()
}
return value!
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value, Condition: Equatable>: CachedProperty {
private var value: Value?
private var condition: Condition
private let compute: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Condition) {
self.condition = condition()
self.compute = wrappedValue
}
var wrappedValue: Value {
get {
if condition != self.condition {
value = compute()
self.condition = condition()
}
return value!
}
set {
value = newValue
}
}
}
struct Test {
@Cached(condition: { true })
var value: Int {
print("Computing value")
return 42
}
@Cached(condition: { false })
var value2: Int {
print("Computing value")
return 42
}
@Cached(condition: { true })
var value3: Int {
print("Computing value")
return 42
}
@Cached(condition: { false })
var value4: Int {
print("Computing value")
return 42
}
}
let test = Test()
print(test.value)
print(test.value2)
print(test.value3)
print(test.value4)
```value = compute() // cannot assign to property: 'self' is immutablestruct Cached<Value, Condition: Equatable>: CachedProperty { // invalid redeclaration of 'Cached'struct Cached<Value, Condition: Equatable>: CachedProperty { // type 'Cached<Value, Condition>' does not conform to protocol 'CachedProperty'value = compute() // cannot assign to property: 'self' is immutableself.condition = condition() // cannot assign to property: 'self' is immutableself.condition = condition() // cannot call value of non-function type 'Condition'@Cached(condition: { true }) // 'Cached' is ambiguous for type lookup in this context@Cached(condition: { false }) // 'Cached' is ambiguous for type lookup in this context@Cached(condition: { true }) // 'Cached' is ambiguous for type lookup in this context@Cached(condition: { false }) // 'Cached' is ambiguous for type lookup in this contextvar condition = false // variable 'condition' was written to, but never read@Cached(condition: { condition }) // 'Cached' is ambiguous for type lookup in this contextvar cached: Int = { // variable 'cached' was never mutated; consider changing to 'let' constantprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue()
self.condition = condition
}
// The condition that determines whether the property should be recomputed.
private let condition: () -> Bool
// The computed property that returns the cached value.
var projectedValue: Value {
get {
// If the condition is true, the property is recomputed and the cached value is updated.
if condition() {
wrappedValue = wrappedValue()
}
// Otherwise, the cached value is returned.
return wrappedValue
}
set {
wrappedValue = newValue
}
}
}
class MyClass {
var counter = 0
@Cached(wrappedValue: { counter += 1; return counter }, condition: { counter < 10 })
var computedValue: Int
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue()
self.condition = condition
}
// The condition that determines whether the property should be recomputed.
private let condition: () -> Bool
// The computed property that returns the cached value.
var projectedValue: Value {
get {
// If the condition is true, the property is recomputed and the cached value is updated.
if condition() {
wrappedValue = wrappedValue()
}
// Otherwise, the cached value is returned.
return wrappedValue
}
set {
wrappedValue = newValue
}
}
}
// Example usage of the Cached property wrapper.
class MyClass {
var counter = 0
@Cached(wrappedValue: { counter += 1; return counter }, condition: { counter < 10 })
var computedValue: Int
}
let myClass = MyClass()
print(myClass.computedValue) // 1
print(myClass.computedValue) // 1
print(myClass.computedValue) // 2
print(myClass.computedValue) // 3
print(myClass.computedValue) // 4
print(myClass.computedValue) // 5
print(myClass.computedValue) // 6
print(myClass.computedValue) // 7
print(myClass.computedValue) // 8
print(myClass.computedValue) // 9
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(myClass.computedValue) // 10
print(wrappedValue = wrappedValue() // cannot assign to property: 'self' is immutablewrappedValue = wrappedValue() // cannot call value of non-function type 'Value'@Cached(wrappedValue: { counter += 1; return counter }, condition: { counter < 10 }) // add () to forward @autoclosure parameter@Cached(wrappedValue: { counter += 1; return counter }, condition: { counter < 10 }) // cannot use instance member 'counter' within property initializer; property initializers run before 'self' is available@Cached(wrappedValue: { counter += 1; return counter }, condition: { counter < 10 }) // cannot use instance member 'counter' within property initializer; property initializers run before 'self' is availableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
typealias Value = Value
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if value == nil || condition() {
value = self.wrappedValue()
}
return value!
}
}
@propertyWrapper
struct CachedWeak<Value: AnyObject>: CachedProperty {
typealias Value = Value
private var value: WeakValue<Value>?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if value == nil || condition() {
value = WeakValue(wrappedValue())
}
return value!.wrappedValue!
}
}
@propertyWrapper
struct CachedUnwrapped<Value: OptionalProtocol>: CachedProperty {
typealias Value = Value.Wrapped
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if value == nil || condition() {
value = self.wrappedValue()
}
return value!.unwrapped
}
}
@propertyWrapper
struct CachedOptional<Value: OptionalProtocol>: CachedProperty {
typealias Value = Value
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if value == nil || condition() {
value = self.wrappedValue()
}
return value!
}
}
@propertyWrapper
struct CachedUnwrappedOptional<Value: OptionalProtocol>: CachedProperty {
typealias Value = Value.Wrapped?
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if value == nil || condition() {
value = self.wrappedValue()
}
return value!.unwrapped
}
}
@propertyWrapper
struct CachedUnwrappedOptionalUnwrapped<Value: OptionalProtocol>: CachedProperty {
typealias Value = Value.Wrapped?
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if value == nil || condition() {
value = self.wrappedValue()
}
return value!.unwrapped.unwrapped
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
typealias Value = Value
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if value == nil || condition() {
value = self.wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct CachedWeak<Value: AnyObject>: CachedProperty {
typealias Value = Value
private var value: WeakValue<Value>?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if value == nil || condition() {
value = WeakValue(wrappedValue())
}
return value!.wrappedValue!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct CachedUnwrapped<Value: OptionalProtocol>: CachedProperty {
typealias Value = Value.Wrapped
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if value == nil || condition() {
value = self.wrappedValue()
}
return value!.unwrapped
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct CachedOptional<Value: OptionalProtocol>: CachedProperty {
typealias Value = Value
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if value == nil || condition() {
value = self.wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct CachedUnwrappedOptional<Value: OptionalProtocol>: CachedProperty {
typealias Value = Value.Wrapped?
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if value == nil || condition() {
value = self.wrappedValue()
}
return value!.unwrapped
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct CachedUnwrappedOptionalUnwrapped<Value: OptionalProtocol>: CachedProperty {
typealias Value = Value.Wrapped?
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if value == nil || condition() {
value = self.wrappedValue()
}
return value!.unwrapped.unwrapped
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct CachedOptionalUnwrapped<Value: OptionalProtocol>: CachedProperty {
struct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = self.wrappedValue() // cannot assign to property: 'self' is immutablestruct CachedWeak<Value: AnyObject>: CachedProperty { // property wrapper type 'CachedWeak' has multiple non-static properties named 'wrappedValue'private var value: WeakValue<Value>? // cannot find type 'WeakValue' in scopeself.value = nil // 'nil' requires a contextual typevar wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = WeakValue(wrappedValue()) // cannot find 'WeakValue' in scopestruct CachedUnwrapped<Value: OptionalProtocol>: CachedProperty { // type 'CachedUnwrapped<Value>' does not conform to protocol 'CachedProperty'struct CachedUnwrapped<Value: OptionalProtocol>: CachedProperty { // property wrapper type 'CachedUnwrapped' has multiple non-static properties named 'wrappedValue'struct CachedUnwrapped<Value: OptionalProtocol>: CachedProperty { // cannot find type 'OptionalProtocol' in scopetypealias Value = Value.Wrapped // 'Wrapped' is not a member type of type 'Value'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = self.wrappedValue() // cannot assign to property: 'self' is immutablereturn value!.unwrapped // value of type 'Value' has no member 'unwrapped'struct CachedOptional<Value: OptionalProtocol>: CachedProperty { // cannot find type 'OptionalProtocol' in scopestruct CachedOptional<Value: OptionalProtocol>: CachedProperty { // property wrapper type 'CachedOptional' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = self.wrappedValue() // cannot assign to property: 'self' is immutablestruct CachedUnwrappedOptional<Value: OptionalProtocol>: CachedProperty { // property wrapper type 'CachedUnwrappedOptional' has multiple non-static properties named 'wrappedValue'struct CachedUnwrappedOptional<Value: OptionalProtocol>: CachedProperty { // cannot find type 'OptionalProtocol' in scopestruct CachedUnwrappedOptional<Value: OptionalProtocol>: CachedProperty { // type 'CachedUnwrappedOptional<Value>' does not conform to protocol 'CachedProperty'typealias Value = Value.Wrapped? // 'Wrapped' is not a member type of type 'Value'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = self.wrappedValue() // cannot assign to property: 'self' is immutablereturn value!.unwrapped // value of type 'Value' has no member 'unwrapped'struct CachedUnwrappedOptionalUnwrapped<Value: OptionalProtocol>: CachedProperty { // type 'CachedUnwrappedOptionalUnwrapped<Value>' does not conform to protocol 'CachedProperty'struct CachedUnwrappedOptionalUnwrapped<Value: OptionalProtocol>: CachedProperty { // cannot find type 'OptionalProtocol' in scopestruct CachedUnwrappedOptionalUnwrapped<Value: OptionalProtocol>: CachedProperty { // property wrapper type 'CachedUnwrappedOptionalUnwrapped' has multiple non-static properties named 'wrappedValue'typealias Value = Value.Wrapped? // 'Wrapped' is not a member type of type 'Value'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = self.wrappedValue() // cannot assign to property: 'self' is immutablereturn value!.unwrapped.unwrapped // value of type 'Value' has no member 'unwrapped'protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition()
}
var wrappedValue: Value {
get {
if condition {
value = nil
}
return value ?? {
value = wrappedValue()
return value!
}()
}
set {
value = newValue
}
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition()
}
var wrappedValue: Value {
get {
if condition {
value = nil
}
return value ?? {
value = wrappedValue()
return value!
}()
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition()
}
var wrappedValue: Value {
get {
if condition {
value = nil
}
return value ?? {
value = wrappedValue()
return value!
}()
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition()
}
var wrappedValue: Value {
get {
if condition {
value = nil
}
return value ?? {
value = wrappedValue()
return value!
}()
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition()
}
var wrappedValue: Value {
get {
if condition {
value = nil
}
return value ?? {
value = wrappedValue()
return value!
}()
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition()
}
var wrappedValue: Value {
get {
if condition {
value = nil
}
return value ?? {
value = wrappedValue()
return value!
}()
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition()
}
var wrappedValue: Value {
get {
if condition {
value = nil
}
return value ?? {
value = wrappedValue()
return value!
}()
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private varvalue = nil // cannot assign to property: 'self' is immutablevalue = wrappedValue() // cannot call value of non-function type 'Value'value = wrappedValue() // cannot assign to property: 'self' is immutableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
typealias Value = Value
private var value: Value
private var condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue
}
return value
}
}
@propertyWrapper
struct Cached<Value, Condition>: CachedProperty where Condition == Value {
typealias Value = Value
typealias Condition = Condition
private var value: Value
private var condition: () -> Condition
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Condition) {
value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
if condition() != condition() {
value = wrappedValue
}
return value
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
typealias Value = Value
private var value: Value
private var condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue
}
return value
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value, Condition>: CachedProperty where Condition == Value {
typealias Value = Value
typealias Condition = Condition
private var value: Value
private var condition: () -> Condition
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Condition) {
value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
if condition() != condition() {
value = wrappedValue
}
return value
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value, Condition>: CachedProperty where Condition == Value {
typealias Value = Value
typealias Condition = Condition
private var value: Value
private var condition: () -> Condition
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Condition) {
value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
if condition() != condition() {
value = wrappedValue
}
return value
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value, Condition>: CachedProperty where Condition == Value {
typealias Value = Value
typealias Condition = Condition
private var value: Value
private var condition: () -> Condition
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Condition) {
value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
if condition() != condition() {
value = wrappedValue
}
return value
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value, Condition>: CachedProperty where Condition == Value {
typealias Value = Value
typealias Condition = Condition
private var value: Value
private var condition: () -> Condition
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Condition) {
value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
if condition() != condition() {
value = wrappedValue
}
return value
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value, Condition>: CachedProperty where Condition == Value {
typealias Value = Value
typealias Condition = Condition
private var value: Value
private var condition: () -> Condition
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Condition) {
value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
if condition() != condition() {
value = wrappedValue
}
return value
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value, Condition>: CachedProperty where Condition == Value {
typealias Value = Value
typealias Condition = Condition
private var value: Value
private var condition: () -> Condition
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Condition) {
value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
if condition() != condition() {
value = wrappedValue
}
return value
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value,value = wrappedValue // cannot assign to property: 'self' is immutablestruct Cached<Value, Condition>: CachedProperty where Condition == Value { // type 'Cached<Value, Condition>' does not conform to protocol 'CachedProperty'struct Cached<Value, Condition>: CachedProperty where Condition == Value { // same-type requirement makes generic parameters 'Condition' and 'Value' equivalent; this is an error in Swift 6struct Cached<Value, Condition>: CachedProperty where Condition == Value { // invalid redeclaration of 'Cached'if condition() != condition() { // binary operator '!=' cannot be applied to two 'Value' operandsvalue = wrappedValue // cannot assign to property: 'self' is immutablevar condition = false // variable 'condition' was written to, but never read@Cached(condition: { condition }) // 'Cached' is ambiguous for type lookup in this contextvar cached: Int = { // variable 'cached' was never mutated; consider changing to 'let' constantinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: LogicalConjunctionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
{ g(f($0)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: LogicalConjunctionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
{ g(f($0)) }
}
let f: (Int) -> Int = { $0 + 1 }
let g: (Int) -> Int = { $0 * 2 }
let h = f >>> g
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}
// Example usage
let add: (Int) -> Int = { $0 + 1 }
let double: (Int) -> Int = { $0 * 2 }
let addAndDouble = add >>> double
let result = addAndDouble(3)
print(result) // 8
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}
// Example usage
let addTwo: (Int) -> Int = { $0 + 2 }
let multiplyByThree: (Int) -> Int = { $0 * 3 }
let addTwoAndMultiplyByThree = addTwo >>> multiplyByThree
print(addTwoAndMultiplyByThree(5)) // prints 17
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: LogicalConjunctionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
{ a in g(f(a)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: LogicalConjunctionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
{ a in g(f(a)) }
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
func add(a: Int, b: Int) -> Int {
return a + b
}
func multiply(a: Int, b: Int) -> Int {
return a * b
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
func add(a: Int, b: Int) -> Int {
return a + b
}
func multiply(a: Int, b: Int) -> Int {
return a * b
}
let addAndMultiply = add >>> multiply
let result = addAndMultiply(2, 3)
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in
g(f(x))
}
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in
g(f(x))
}
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in
g(f(x))
}
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in
g(f(x))
}
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}
// Example usage
let addTwo: (Int) -> Int = { $0 + 2 }
let multiplyByThree: (Int) -> Int = { $0 * 3 }
let addTwoAndMultiplyByThree: (Int) -> Int = addTwo >>> multiplyByThree
print(addTwoAndMultiplyByThree(5)) // prints 17
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
// Create a SHA-256 digest object.
var digest = SHA256.Digest()
// Create a buffer to store data read from the stream.
var buffer = [UInt8](repeating: 0, count: bufferSize)
// Read data from the stream into the buffer until the end of the stream is reached.
while let bytesRead = inputStream.read(&buffer, maxLength: bufferSize) {
// If no data was read, break out of the loop.
if bytesRead == 0 {
break
}
// If an error occurred while reading the data, return nil.
if bytesRead == -1 {
return nil
}
// Compute the SHA-256 hash of the data in the buffer and append it to the digest.
let hash = SHA256.hash(data: Data(bytes: &buffer, count: bytesRead))
digest.append(hash)
}
// Return the computed SHA-256 hash.
return digest
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
// Create a SHA-256 digest object.
var digest = SHA256.Digest()
// Create a buffer to store data read from the stream.
var buffer = [UInt8](repeating: 0, count: bufferSize)
// Read data from the stream into the buffer until the end of the stream is reached.
while let bytesRead = inputStream.read(&buffer, maxLength: bufferSize) {
// If no data was read, break out of the loop.
if bytesRead == 0 {
break
}
// If an error occurred while reading the data, return nil.
if bytesRead == -1 {
return nil
}
// Compute the SHA-256 hash of the data in the buffer and append it to the digest.
let hash = SHA256.hash(data: Data(bytes: &buffer, count: bytesRead))
digest.append(hash)
}
// Return the computed SHA-256 hash.
return digest
}
// Example usage:
let filePath = "/path/to/file"
if let file = FileHandle(forReadingAtPath: filePath) {
let inputStream = InputStream(fileHandle: file)
if let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024) {
print("SHA-256 hash: \(hash)")
} else {
print("Error computing SHA-256 hash")
}
} else {
print("Error opening file")
}
```var digest = SHA256.Digest() // 'SHA256.Digest' (aka 'SHA256Digest') cannot be constructed because it has no accessible initializerswhile let bytesRead = inputStream.read(&buffer, maxLength: bufferSize) { // initializer for conditional binding must have Optional type, not 'Int'import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a SHA-256 digest object to store the hash value.
var digest = SHA256Digest()
// Create a buffer to read data from the input stream.
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
// Read data from the input stream in chunks of the specified buffer size until the end of the stream is reached.
while let bytesRead = inputStream.read(buffer, maxLength: bufferSize) {
// Update the SHA-256 digest with the read data.
digest.update(data: Data(bytes: buffer, count: bytesRead))
}
// Finalize the hash computation and return the digest.
return digest.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a SHA-256 digest object to store the hash value.
var digest = SHA256Digest()
// Create a buffer to read data from the input stream.
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
// Read data from the input stream in chunks of the specified buffer size until the end of the stream is reached.
while let bytesRead = inputStream.read(buffer, maxLength: bufferSize) {
// Update the SHA-256 digest with the read data.
digest.update(data: Data(bytes: buffer, count: bytesRead))
}
// Finalize the hash computation and return the digest.
return digest.finalize()
}
// Example usage of the function to compute the SHA-256 hash of a file.
if let fileURL = URL(string: "https://raw.githubusercontent.com/apple/swift/main/docs/swift-book/documentation/TheSwiftProgrammingLanguage/Introduction/hello.swift") {
do {
// Open the file at the specified URL for reading.
let inputStream = InputStream(url: fileURL)!
inputStream.open()
// Compute the SHA-256 hash of the file with a buffer size of 1024 bytes.
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
// Print the computed hash value to the console.
print("SHA-256 hash of file: \(hash.map { String(format: "%02x", $0) }.joined())")
} catch {
print("Error opening file: \(error)")
}
}
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializerswhile let bytesRead = inputStream.read(buffer, maxLength: bufferSize) { // initializer for conditional binding must have Optional type, not 'Int'import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var buffer = Data(count: bufferSize)
var hash = SHA256()
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer)
if bytesRead > 0 {
hash.update(data: buffer[..<bytesRead])
}
}
return hash.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var buffer = Data(count: bufferSize)
var hash = SHA256()
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer)
if bytesRead > 0 {
hash.update(data: buffer[..<bytesRead])
}
}
return hash.finalize()
}
// Example usage:
let filePath = "/path/to/file.txt"
guard let file = FileHandle(forReadingAtPath: filePath) else {
print("Error: Unable to open file at \(filePath)")
exit(1)
}
guard let inputStream = InputStream(fileHandle: file) else {
print("Error: Unable to create InputStream")
exit(1)
}
let bufferSize = 1024 * 1024 // 1MB buffer size
if let sha256Hash = computeSHA256Hash(of: inputStream, bufferSize: bufferSize) {
print("SHA-256 hash: \(sha256Hash.compactHexEncodedString())")
} else {
print("Error: Unable to compute SHA-256 hash")
}
```let bytesRead = inputStream.read(&buffer) // missing argument for parameter 'maxLength' in callimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer {
buffer.deallocate()
}
// Create a SHA-256 digest
var digest = SHA256Digest()
// Read data from the input stream in chunks of the specified buffer size
while let bytesRead = inputStream.read(buffer, maxLength: bufferSize) {
let data = Data(bytes: buffer, count: bytesRead)
// Update the SHA-256 digest with the read data
digest.update(data: data)
}
// Return the final digest
return digest.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer {
buffer.deallocate()
}
// Create a SHA-256 digest
var digest = SHA256Digest()
// Read data from the input stream in chunks of the specified buffer size
while let bytesRead = inputStream.read(buffer, maxLength: bufferSize) {
let data = Data(bytes: buffer, count: bytesRead)
// Update the SHA-256 digest with the read data
digest.update(data: data)
}
// Return the final digest
return digest.finalize()
}
// Example usage:
let data = Data("Hello, World!".utf8)
let inputStream = InputStream(data: data)
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
if let hash = hash {
print("SHA-256 Hash: \(hash)")
} else {
print("Failed to compute hash")
}
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializerswhile let bytesRead = inputStream.read(buffer, maxLength: bufferSize) { // initializer for conditional binding must have Optional type, not 'Int'import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a SHA-256 digest object
let digest = SHA256Digest()
// Create a buffer to read data from the input stream
var buffer = [UInt8](repeating: 0, count: bufferSize)
// Read data from the input stream until EOF is reached
while inputStream.read(&buffer, maxLength: bufferSize) > 0 {
// Update the SHA-256 digest with the read data
digest.update(data: Data(buffer))
}
// Return the computed SHA-256 hash
return digest
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a SHA-256 digest object
let digest = SHA256Digest()
// Create a buffer to read data from the input stream
var buffer = [UInt8](repeating: 0, count: bufferSize)
// Read data from the input stream until EOF is reached
while inputStream.read(&buffer, maxLength: bufferSize) > 0 {
// Update the SHA-256 digest with the read data
digest.update(data: Data(buffer))
}
// Return the computed SHA-256 hash
return digest
}
```let digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
// Create a SHA-256 digest object.
let sha256 = SHA256()
// Create a buffer to store the data read from the input stream.
var buffer = Data(count: bufferSize)
// Read data from the input stream until there's no more data or an error occurs.
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// If the number of bytes read is less than the buffer size, the end of the stream has been reached.
if bytesRead < bufferSize {
// If there's no more data to read, break out of the loop.
if bytesRead == 0 {
break
}
// If an error occurs while reading from the input stream, return nil.
if inputStream.streamError != nil {
return nil
}
}
// Update the SHA-256 digest with the data read from the input stream.
sha256.update(data: buffer)
}
// Return the final SHA-256 digest.
return sha256.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
// Create a SHA-256 digest object.
let sha256 = SHA256()
// Create a buffer to store the data read from the input stream.
var buffer = Data(count: bufferSize)
// Read data from the input stream until there's no more data or an error occurs.
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// If the number of bytes read is less than the buffer size, the end of the stream has been reached.
if bytesRead < bufferSize {
// If there's no more data to read, break out of the loop.
if bytesRead == 0 {
break
}
// If an error occurs while reading from the input stream, return nil.
if inputStream.streamError != nil {
return nil
}
}
// Update the SHA-256 digest with the data read from the input stream.
sha256.update(data: buffer)
}
// Return the final SHA-256 digest.
return sha256.finalize()
}
```sha256.update(data: buffer) // cannot use mutating member on immutable value: 'sha256' is a 'let' constantimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer {
buffer.deallocate()
}
let context = SHA256.hasher()
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead > 0 {
context.update(buffer, count: bytesRead)
}
}
return context.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer {
buffer.deallocate()
}
let context = SHA256.hasher()
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead > 0 {
context.update(buffer, count: bytesRead)
}
}
return context.finalize()
}
// Example usage
let data = Data("Hello, World!".utf8)
let inputStream = InputStream(data: data)
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
print("SHA-256 hash: \(hash ?? "Unknown")")
```let context = SHA256.hasher() // type 'SHA256' has no member 'hasher'import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var hash = SHA256.hash(data: Data())
while let bytesRead = inputStream.read(buffer, maxLength: bufferSize) {
if bytesRead > 0 {
let data = Data(bytes: buffer, count: bytesRead)
hash = SHA256.hash(data: hash + data)
}
}
return hash
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var hash = SHA256.hash(data: Data())
while let bytesRead = inputStream.read(buffer, maxLength: bufferSize) {
if bytesRead > 0 {
let data = Data(bytes: buffer, count: bytesRead)
hash = SHA256.hash(data: hash + data)
}
}
return hash
}
// Example usage:
let inputStream = InputStream(fileAtPath: "/path/to/file")
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
if let hash = hash {
print("SHA-256 Hash: \(hash.description)")
} else {
print("Error computing SHA-256 hash.")
}
```while let bytesRead = inputStream.read(buffer, maxLength: bufferSize) { // initializer for conditional binding must have Optional type, not 'Int'import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a SHA-256 digest object
var digest = SHA256()
// Create a buffer to store data read from the input stream
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
// Read data from the input stream in chunks of the specified buffer size
while inputStream.hasBytesAvailable {
// Read data into the buffer
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
// If no data was read, break out of the loop
guard bytesRead > 0 else { break }
// Update the digest with the data read from the buffer
digest.update(data: Data(bytes: buffer, count: bytesRead))
}
// Free the buffer memory
buffer.deallocate()
// Return the final SHA-256 hash digest
return digest.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a SHA-256 digest object
var digest = SHA256()
// Create a buffer to store data read from the input stream
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
// Read data from the input stream in chunks of the specified buffer size
while inputStream.hasBytesAvailable {
// Read data into the buffer
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
// If no data was read, break out of the loop
guard bytesRead > 0 else { break }
// Update the digest with the data read from the buffer
digest.update(data: Data(bytes: buffer, count: bytesRead))
}
// Free the buffer memory
buffer.deallocate()
// Return the final SHA-256 hash digest
return digest.finalize()
}
// Example usage
let data = "Hello, world!"
let inputStream = InputStream(data: data.data(using: .utf8)!)
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
print(hash)
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var hash = SHA256()
var bytesRead = 0
while bytesRead >= 0 {
bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(bytes: buffer, count: bytesRead))
}
}
return hash.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var hash = SHA256()
var bytesRead = 0
while bytesRead >= 0 {
bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(bytes: buffer, count: bytesRead))
}
}
return hash.finalize()
}
// Example usage
if let url = URL(string: "https://example.com/file.txt") {
do {
let inputStream = InputStream(url: url)!
inputStream.open()
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
print("SHA-256 Hash: \(hash!)")
inputStream.close()
} catch {
print("Error: \(error)")
}
}
```typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
let (c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15) = tuple16
let c = [c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15]
self.init(c)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
let (c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15) = tuple16
let c = [c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15]
self.init(c)
}
}
```self.init(c) // no exact matches in call to initializertypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(tuple16.0, tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5, tuple16.6, tuple16.7, tuple16.8, tuple16.9, tuple16.10, tuple16.11, tuple16.12, tuple16.13, tuple16.14, tuple16.15)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
self.init(tuple16.0, tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5, tuple16.6, tuple16.7, tuple16.8, tuple16.9, tuple16.10, tuple16.11, tuple16.12, tuple16.13, tuple16.14, tuple16.15)
}
}
```self.init(tuple16.0, tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5, tuple16.6, tuple16.7, tuple16.8, tuple16.9, tuple16.10, tuple16.11, tuple16.12, tuple16.13, tuple16.14, tuple16.15) // initializer expects a single parameter of type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)')typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8]()
for (index, value) in tuple16.enumerated() {
buffer.append(value)
if value == 0 {
break
}
}
self.init(bytes: buffer, encoding: .utf8)!
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8]()
for (index, value) in tuple16.enumerated() {
buffer.append(value)
if value == 0 {
break
}
}
self.init(bytes: buffer, encoding: .utf8)!
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8]()
for (index, value) in tuple16.enumerated() {
buffer.append(value)
if value == 0 {
break
}
}
self.init(bytes: buffer, encoding: .utf8)!
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8]()
for (index, value) in tuple16.enumerated() {
buffer.append(value)
if value == 0 {
break
}
}
self.init(bytes: buffer, encoding: .utf8)!
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8]()
for (index, value) in tuple16.enumerated() {
buffer.append(value)
if value == 0 {
break
}
}
self.init(bytes: buffer, encoding: .utf8)!
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8]()
for (index, value) in tuple16.enumerated() {
buffer.append(value)
if value == 0 {
break
}
}
self.init(bytes: buffer, encoding: .utf8)!
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8]()
for (index, value) in tuple16.enumerated() {
buffer.append(value)
if value == 0 {
break
}
}
self.init(bytes: buffer, encoding: .utf8)!
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8]()
for (index, value) in tuple16.enumerated() {
buffer.append(value)
if value == 0 {
break
}
}
self.init(bytes: buffer, encoding: .utf8)!
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8]()
for (index, value) in tuple16.enumerated() {
buffer.append(value)
if value == 0 {
break
}
}
self.init(bytes: buffer, encoding: .utf8)!
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8]()
for (index, value) in tuple16.enumeratedfor (index, value) in tuple16.enumerated() { // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member 'enumerated'self.init(bytes: buffer, encoding: .utf8)! // type of expression is ambiguous without a type annotationtypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
let bytes = [UInt8](tuple16.0..<tuple16.16)
self.init(bytes: bytes, encoding: .utf8) ?? ""
}
}
extension Array where Element == Int8 {
init(tuple16: Tuple16) {
self.init(tuple16.0..<tuple16.16)
}
}
extension Array where Element == Int8 {
func toTuple16() -> Tuple16 {
(self[0], self[1], self[2], self[3], self[4], self[5], self[6], self[7], self[8], self[9], self[10], self[11], self[12], self[13], self[14], self[15])
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
let bytes = [UInt8](tuple16.0..<tuple16.16)
self.init(bytes: bytes, encoding: .utf8) ?? ""
}
}
// Extension to the Array<Int8> type that allows initializing an array of Int8 values from a tuple of 16 Int8 values.
extension Array where Element == Int8 {
init(tuple16: Tuple16) {
self.init(tuple16.0..<tuple16.16)
}
}
// Extension to the Array<Int8> type that allows converting an array of Int8 values to a tuple of 16 Int8 values.
extension Array where Element == Int8 {
func toTuple16() -> Tuple16 {
(self[0], self[1], self[2], self[3], self[4], self[5], self[6], self[7], self[8], self[9], self[10], self[11], self[12], self[13], self[14], self[15])
}
}
```let bytes = [UInt8](tuple16.0..<tuple16.16) // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member '16'let bytes = [UInt8](tuple16.0..<tuple16.16) // missing argument label '_immutableCocoaArray:' in callself.init(bytes: bytes, encoding: .utf8) ?? "" // cannot convert value of type 'String' to expected argument type '()'self.init(tuple16.0..<tuple16.16) // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member '16'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
// Create an array of 16 bytes, where each byte is initialized from the corresponding Int8 value in the tuple
var bytes = [UInt8](repeating: 0, count: 16)
for (index, value) in tuple16.enumerated() {
bytes[index] = UInt8(value)
}
// Initialize the String from the array of bytes
self.init(bytes: bytes, encoding: .utf8)!
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
// Create an array of 16 bytes, where each byte is initialized from the corresponding Int8 value in the tuple
var bytes = [UInt8](repeating: 0, count: 16)
for (index, value) in tuple16.enumerated() {
bytes[index] = UInt8(value)
}
// Initialize the String from the array of bytes
self.init(bytes: bytes, encoding: .utf8)!
}
}
// Example usage of the extension
let tuple16 = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
let string = String(tuple16: tuple16)
print(string) // "12345678910111213141516"
```for (index, value) in tuple16.enumerated() { // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member 'enumerated'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
// Convert the tuple of Int8 values to a C-style null-terminated string
var cString: [Int8] = [Int8](tuple16)
cString.append(0)
// Initialize the String from the C-style null-terminated string
self.init(cString: cString)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
// Convert the tuple of Int8 values to a C-style null-terminated string
var cString: [Int8] = [Int8](tuple16)
cString.append(0)
// Initialize the String from the C-style null-terminated string
self.init(cString: cString)
}
}
// Example usage
let tuple: Tuple16 = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
let string = String(tuple16: tuple)
print(string) // Output: "12345678910111213141516"
```var cString: [Int8] = [Int8](tuple16) // no exact matches in call to initializertypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var string = ""
for value in tuple16 {
let char = String(UnicodeScalar(value)!)
if char == "\0" {
break
}
string += char
}
self.init(string)
}
}
extension String {
func toTuple16() -> Tuple16 {
var tuple = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
for (index, char) in self.characters.enumerate() {
if index >= 16 {
break
}
tuple[index] = Int8(char.value)
}
return tuple
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var string = ""
for value in tuple16 {
let char = String(UnicodeScalar(value)!)
if char == "\0" {
break
}
string += char
}
self.init(string)
}
}
// Extension to the String type that allows converting a String to a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
func toTuple16() -> Tuple16 {
var tuple = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
for (index, char) in self.characters.enumerate() {
if index >= 16 {
break
}
tuple[index] = Int8(char.value)
}
return tuple
}
}
// Example usage
let tuple = (104, 101, 108, 108, 111, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
let string = String(tuple16: tuple)
print(string) // "hello"
let tuple2 = string.toTuple16()
print(tuple2) // (104, 101, 108, 108, 111, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
```for value in tuple16 { // for-in loop requires 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') to conform to 'Sequence'for (index, char) in self.characters.enumerate() { // value of type 'String' has no member 'enumerate'return tuple // cannot convert return expression of type '(Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int)' to return type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)')typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var string = ""
for byte in tuple16 where byte != 0 {
string.append(UnicodeScalar(Int(byte)))
}
self.init(string)
}
}
extension Tuple16 {
init(_ string: String) {
var tuple: Tuple16 = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
for (i, byte) in string.utf8.enumerated() {
tuple[i] = Int8(byte)
}
self = tuple
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var string = ""
for byte in tuple16 where byte != 0 {
string.append(UnicodeScalar(Int(byte)))
}
self.init(string)
}
}
// Extension to the Tuple16 type that allows initializing a tuple from a String, where the tuple represents a C-style null-terminated string.
extension Tuple16 {
init(_ string: String) {
var tuple: Tuple16 = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
for (i, byte) in string.utf8.enumerated() {
tuple[i] = Int8(byte)
}
self = tuple
}
}
```for byte in tuple16 where byte != 0 { // for-in loop requires 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') to conform to 'Sequence'extension Tuple16 { // tuple extensions are experimentalextension Tuple16 { // tuple extension must declare conformance to exactly one protocolextension Tuple16 { // tuple extension must be written as extension of '(repeat each Element)'tuple[i] = Int8(byte) // cannot access element using subscript for tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)'); use '.' notation insteadself = tuple // cannot assign value of type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') to type '(repeat each Element)'self = tuple // pack expansion requires that 'Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8' and 'each Element' have the same shapetypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(bytes: tuple16, encoding: .ascii)!
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
self.init(bytes: tuple16, encoding: .ascii)!
}
}
```self.init(bytes: tuple16, encoding: .ascii)! // type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') cannot conform to 'Sequence'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
// Initialize the string with the tuple values
self = String(tuple16.0) + String(tuple16.1) + String(tuple16.2) + String(tuple16.3) + String(tuple16.4) + String(tuple16.5) + String(tuple16.6) + String(tuple16.7) + String(tuple16.8) + String(tuple16.9) + String(tuple16.10) + String(tuple16.11) + String(tuple16.12) + String(tuple16.13) + String(tuple16.14) + String(tuple16.15)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
// Initialize the string with the tuple values
self = String(tuple16.0) + String(tuple16.1) + String(tuple16.2) + String(tuple16.3) + String(tuple16.4) + String(tuple16.5) + String(tuple16.6) + String(tuple16.7) + String(tuple16.8) + String(tuple16.9) + String(tuple16.10) + String(tuple16.11) + String(tuple16.12) + String(tuple16.13) + String(tuple16.14) + String(tuple16.15)
}
}
``` // XCTAssertEqual failed: (7210110810811144328711111410810033000) is not equal to (Hello, World!)import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (lhs.width == rhs.width) && (lhs.height == rhs.height) && (lhs.pixelFormat == rhs.pixelFormat) && (CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs))
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func <(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (lhs.width < rhs.width) || (lhs.height < rhs.height)
}
func >(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (lhs.width > rhs.width) || (lhs.height > rhs.height)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (lhs.width == rhs.width) && (lhs.height == rhs.height) && (lhs.pixelFormat == rhs.pixelFormat) && (CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs))
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, and content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if the first pixel buffer is smaller than the second pixel buffer.
func <(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (lhs.width < rhs.width) || (lhs.height < rhs.height)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if the first pixel buffer is larger than the second pixel buffer.
func >(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (lhs.width > rhs.width) || (lhs.height > rhs.height)
}
```return (lhs.width == rhs.width) && (lhs.height == rhs.height) && (lhs.pixelFormat == rhs.pixelFormat) && (CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs)) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'return (lhs.width == rhs.width) && (lhs.height == rhs.height) && (lhs.pixelFormat == rhs.pixelFormat) && (CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs)) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'return (lhs.width == rhs.width) && (lhs.height == rhs.height) && (lhs.pixelFormat == rhs.pixelFormat) && (CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs)) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'return (lhs.width == rhs.width) && (lhs.height == rhs.height) && (lhs.pixelFormat == rhs.pixelFormat) && (CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs)) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'return (lhs.width == rhs.width) && (lhs.height == rhs.height) && (lhs.pixelFormat == rhs.pixelFormat) && (CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs)) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'return (lhs.width == rhs.width) && (lhs.height == rhs.height) && (lhs.pixelFormat == rhs.pixelFormat) && (CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs)) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'return (lhs.width < rhs.width) || (lhs.height < rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'return (lhs.width < rhs.width) || (lhs.height < rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'return (lhs.width < rhs.width) || (lhs.height < rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'return (lhs.width < rhs.width) || (lhs.height < rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'return (lhs.width > rhs.width) || (lhs.height > rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'return (lhs.width > rhs.width) || (lhs.height > rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'return (lhs.width > rhs.width) || (lhs.height > rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'return (lhs.width > rhs.width) || (lhs.height > rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormat == rhs.pixelFormat && lhs.bytesPerRow == rhs.bytesPerRow
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormat != rhs.pixelFormat || lhs.bytesPerRow != rhs.bytesPerRow
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return lhs != rhs
}
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return lhs != rhs
}
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return lhs != rhs
}
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if lhs == nil && rhs == nil {
return true
}
guard let lhs = lhs, let rhs = rhs else {
return false
}
return lhs == rhs
}
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if lhs == nil && rhs == nil {
return false
}
guard let lhs = lhs, let rhs = rhs else {
return true
}
return lhs != rhs
}
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return lhs == rhs
}
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return lhs == rhs
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormat == rhs.pixelFormat && lhs.bytesPerRow == rhs.bytesPerRow
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormat != rhs.pixelFormat || lhs.bytesPerRow != rhs.bytesPerRow
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return lhs != rhs
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return lhs != rhs
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return lhs != rhs
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if lhs == nil && rhs == nil {
return true
}
guard let lhs = lhs, let rhs = rhs else {
return false
}
return lhs == rhs
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if lhs == nil && rhs == nil {
return false
}
guard let lhs = lhs, let rhs = rhs else {
return true
}
return lhs != rhs
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return lhs == rhs
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return lhs == rhs
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return lhs != rhs
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return lhs != rhs
}
```return lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormat == rhs.pixelFormat && lhs.bytesPerRow == rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'return lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormat == rhs.pixelFormat && lhs.bytesPerRow == rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'return lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormat == rhs.pixelFormat && lhs.bytesPerRow == rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'return lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormat == rhs.pixelFormat && lhs.bytesPerRow == rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'return lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormat == rhs.pixelFormat && lhs.bytesPerRow == rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'return lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormat == rhs.pixelFormat && lhs.bytesPerRow == rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'return lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormat == rhs.pixelFormat && lhs.bytesPerRow == rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'return lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormat == rhs.pixelFormat && lhs.bytesPerRow == rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'return lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormat != rhs.pixelFormat || lhs.bytesPerRow != rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'return lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormat != rhs.pixelFormat || lhs.bytesPerRow != rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'return lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormat != rhs.pixelFormat || lhs.bytesPerRow != rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'return lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormat != rhs.pixelFormat || lhs.bytesPerRow != rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'return lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormat != rhs.pixelFormat || lhs.bytesPerRow != rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'return lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormat != rhs.pixelFormat || lhs.bytesPerRow != rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'return lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormat != rhs.pixelFormat || lhs.bytesPerRow != rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'return lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormat != rhs.pixelFormat || lhs.bytesPerRow != rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool { // invalid redeclaration of '!='import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.height == rhs.height &&
lhs.width == rhs.width &&
lhs.pixelFormat == rhs.pixelFormat &&
lhs.bytesPerRow == rhs.bytesPerRow &&
lhs.data == rhs.data
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs == rhs
}
return false
}
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs != rhs
}
return false
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.height == rhs.height &&
lhs.width == rhs.width &&
lhs.pixelFormat == rhs.pixelFormat &&
lhs.bytesPerRow == rhs.bytesPerRow &&
lhs.data == rhs.data
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers do not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs == rhs
}
return false
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers do not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs != rhs
}
return false
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs == rhs
}
return false
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers do not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs != rhs
}
return false
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs == rhs
}
return false
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers do not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs != rhs
}
return false
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs == rhs
}
return false
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers do not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs != rhs
}
return false
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs == rhs
}
return false
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers do not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs != rhs
}
return false
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs == rhs
}
return false
}
// Custom operator which providesreturn lhs.height == rhs.height && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'return lhs.height == rhs.height && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.width == rhs.width && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'lhs.width == rhs.width && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'lhs.pixelFormat == rhs.pixelFormat && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'lhs.pixelFormat == rhs.pixelFormat && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'lhs.bytesPerRow == rhs.bytesPerRow && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'lhs.bytesPerRow == rhs.bytesPerRow && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'lhs.data == rhs.data // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'data'lhs.data == rhs.data // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'data'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width == rhs.width &&
lhs.height == rhs.height &&
lhs.pixelFormat == rhs.pixelFormat &&
CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width != rhs.width ||
lhs.height != rhs.height ||
lhs.pixelFormat != rhs.pixelFormat ||
CVPixelBufferGetBaseAddress(lhs) != CVPixelBufferGetBaseAddress(rhs)
}
func ~==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width != rhs.width ||
lhs.height != rhs.height ||
lhs.pixelFormat != rhs.pixelFormat
}
func !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width != rhs.width ||
lhs.height != rhs.height
}
func !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.pixelFormat != rhs.pixelFormat
}
func !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetBaseAddress(lhs) != CVPixelBufferGetBaseAddress(rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width == rhs.width &&
lhs.height == rhs.height &&
lhs.pixelFormat == rhs.pixelFormat &&
CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width != rhs.width ||
lhs.height != rhs.height ||
lhs.pixelFormat != rhs.pixelFormat ||
CVPixelBufferGetBaseAddress(lhs) != CVPixelBufferGetBaseAddress(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size or pixel format.
func ~==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width != rhs.width ||
lhs.height != rhs.height ||
lhs.pixelFormat != rhs.pixelFormat
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size.
func !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width != rhs.width ||
lhs.height != rhs.height
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in pixel format.
func !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.pixelFormat != rhs.pixelFormat
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in content.
func !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetBaseAddress(lhs) != CVPixelBufferGetBaseAddress(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size or pixel format or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width != rhs.width ||
lhs.height != rhs.height ||
lhs.pixelFormat != rhs.pixelFormat ||
CVPixelBufferGetBaseAddress(lhs) != CVPixelBufferGetBaseAddress(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size or pixel format.
func ~==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width != rhs.width ||
lhs.height != rhs.height ||
lhs.pixelFormat != rhs.pixelFormat
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size.
func !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width != rhs.width ||
lhs.height != rhs.height
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in pixel format.
func !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.pixelFormat != rhs.pixelFormat
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in content.
func !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetBaseAddress(lhs) != CVPixelBufferGetBaseAddress(rhs)
}
```return lhs.width == rhs.width && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'return lhs.width == rhs.width && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'lhs.height == rhs.height && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.height == rhs.height && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.pixelFormat == rhs.pixelFormat && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'lhs.pixelFormat == rhs.pixelFormat && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'return lhs.width != rhs.width || // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'return lhs.width != rhs.width || // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'lhs.height != rhs.height || // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.height != rhs.height || // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.pixelFormat != rhs.pixelFormat || // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'lhs.pixelFormat != rhs.pixelFormat || // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'func ~==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationreturn lhs.width != rhs.width || // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'return lhs.width != rhs.width || // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'lhs.height != rhs.height || // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.height != rhs.height || // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.pixelFormat != rhs.pixelFormat // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'lhs.pixelFormat != rhs.pixelFormat // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'func !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationreturn lhs.width != rhs.width || // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'return lhs.width != rhs.width || // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'lhs.height != rhs.height // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.height != rhs.height // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'func !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationfunc !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // invalid redeclaration of '!=~'return lhs.pixelFormat != rhs.pixelFormat // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'return lhs.pixelFormat != rhs.pixelFormat // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'func !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // invalid redeclaration of '!=~'func !=~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width == rhs.width &&
lhs.height == rhs.height &&
lhs.pixelFormat == rhs.pixelFormat &&
lhs.bytesPerRow == rhs.bytesPerRow &&
lhs.baseAddress == rhs.baseAddress
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.width == rhs.width &&
lhs.height == rhs.height &&
lhs.pixelFormat == rhs.pixelFormat &&
lhs.bytesPerRow == rhs.bytesPerRow &&
lhs.baseAddress == rhs.baseAddress
}
```return lhs.width == rhs.width && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'return lhs.width == rhs.width && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'lhs.height == rhs.height && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.height == rhs.height && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.pixelFormat == rhs.pixelFormat && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'lhs.pixelFormat == rhs.pixelFormat && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'lhs.bytesPerRow == rhs.bytesPerRow && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'lhs.bytesPerRow == rhs.bytesPerRow && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'lhs.baseAddress == rhs.baseAddress // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'baseAddress'lhs.baseAddress == rhs.baseAddress // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'baseAddress'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
lhs.width == rhs.width &&
lhs.height == rhs.height &&
lhs.pixelFormat == rhs.pixelFormat &&
lhs.bytesPerRow == rhs.bytesPerRow &&
lhs.data.isEqual(to: rhs.data)
)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
lhs.width == rhs.width &&
lhs.height == rhs.height &&
lhs.pixelFormat == rhs.pixelFormat &&
lhs.bytesPerRow == rhs.bytesPerRow &&
lhs.data.isEqual(to: rhs.data)
)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return !(lhslhs.width == rhs.width && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'lhs.width == rhs.width && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'lhs.height == rhs.height && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.height == rhs.height && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.pixelFormat == rhs.pixelFormat && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'lhs.pixelFormat == rhs.pixelFormat && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'lhs.bytesPerRow == rhs.bytesPerRow && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'lhs.bytesPerRow == rhs.bytesPerRow && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'lhs.data.isEqual(to: rhs.data) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'data'lhs.data.isEqual(to: rhs.data) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'data'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.height == rhs.height &&
lhs.width == rhs.width &&
lhs.pixelFormat == rhs.pixelFormat &&
CVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return lhs == rhs
}
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return lhs != rhs
}
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return lhs == rhs
}
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return lhs != rhs
}
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return lhs == rhs
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return lhs != rhs
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.height == rhs.height &&
lhs.width == rhs.width &&
lhs.pixelFormat == rhs.pixelFormat &&
CVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return lhs == rhs
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return lhs != rhs
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return lhs == rhs
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return lhs != rhs
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return lhs == rhs
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return lhs != rhs
}
```return lhs.height == rhs.height && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'return lhs.height == rhs.height && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.width == rhs.width && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'lhs.width == rhs.width && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'lhs.pixelFormat == rhs.pixelFormat && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'lhs.pixelFormat == rhs.pixelFormat && // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormat'CVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs) // cannot find 'CVPixelBufferGetData' in scopeCVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs) // cannot find 'CVPixelBufferGetData' in scopeimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs)
)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) != CVPixelBufferGetWidth(rhs) ||
CVPixelBufferGetHeight(lhs) != CVPixelBufferGetHeight(rhs) ||
CVPixelBufferGetPixelFormatType(lhs) != CVPixelBufferGetPixelFormatType(rhs) ||
CVPixelBufferGetData(lhs) != CVPixelBufferGetData(rhs)
)
}
func !~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~= rhs)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
func ~==(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return !(lhs ~= rhs)
}
func ~==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~= rhs)
}
func ~==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs ~= rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs)
)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, and content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) != CVPixelBufferGetWidth(rhs) ||
CVPixelBufferGetHeight(lhs) != CVPixelBufferGetHeight(rhs) ||
CVPixelBufferGetPixelFormatType(lhs) != CVPixelBufferGetPixelFormatType(rhs) ||
CVPixelBufferGetData(lhs) != CVPixelBufferGetData(rhs)
)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~= rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ~==(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
return !(lhs ~= rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ~==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~= rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ~==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs ~= rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ~==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs ~= rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
return !(lhs == rhs)
}
// Custom operator which providesCVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs) // cannot find 'CVPixelBufferGetData' in scopeCVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs) // cannot find 'CVPixelBufferGetData' in scopeCVPixelBufferGetData(lhs) != CVPixelBufferGetData(rhs) // cannot find 'CVPixelBufferGetData' in scopeCVPixelBufferGetData(lhs) != CVPixelBufferGetData(rhs) // cannot find 'CVPixelBufferGetData' in scopefunc !~(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationfunc ~==(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool { // operator implementation without matching operator declarationfunc ~==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationfunc ~==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool { // operator implementation without matching operator declarationimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs)
)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func ~==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) != CVPixelBufferGetWidth(rhs) ||
CVPixelBufferGetHeight(lhs) != CVPixelBufferGetHeight(rhs) ||
CVPixelBufferGetPixelFormatType(lhs) != CVPixelBufferGetPixelFormatType(rhs) ||
CVPixelBufferGetData(lhs) != CVPixelBufferGetData(rhs)
)
}
func ~!=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~= rhs)
}
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) != CVPixelBufferGetWidth(rhs) ||
CVPixelBufferGetHeight(lhs) != CVPixelBufferGetHeight(rhs) ||
CVPixelBufferGetPixelFormatType(lhs) != CVPixelBufferGetPixelFormatType(rhs)
)
}
func ~>(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) != CVPixelBufferGetWidth(rhs) ||
CVPixelBufferGetHeight(lhs) != CVPixelBufferGetHeight(rhs)
)
}
func ~<(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~> rhs)
}
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetPixelFormatType(lhs) != CVPixelBufferGetPixelFormatType(rhs)
)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs)
)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, and content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ~==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) != CVPixelBufferGetWidth(rhs) ||
CVPixelBufferGetHeight(lhs) != CVPixelBufferGetHeight(rhs) ||
CVPixelBufferGetPixelFormatType(lhs) != CVPixelBufferGetPixelFormatType(rhs) ||
CVPixelBufferGetData(lhs) != CVPixelBufferGetData(rhs)
)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ~!=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~= rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size or pixel format.
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) != CVPixelBufferGetWidth(rhs) ||
CVPixelBufferGetHeight(lhs) != CVPixelBufferGetHeight(rhs) ||
CVPixelBufferGetPixelFormatType(lhs) != CVPixelBufferGetPixelFormatType(rhs)
)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size or pixel format.
func ~!=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~= rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size.
func ~>(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) != CVPixelBufferGetWidth(rhs) ||
CVPixelBufferGetHeight(lhs) != CVPixelBufferGetHeight(rhs)
)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size.
func ~<(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~> rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in pixel format.
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetPixelFormatType(lhs) != CVPixelBufferGetPixelFormatType(rhs)
)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in pixel format.
func ~!=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~= rhs)
}
```CVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs) // cannot find 'CVPixelBufferGetData' in scopeCVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs) // cannot find 'CVPixelBufferGetData' in scopefunc ~==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationCVPixelBufferGetData(lhs) != CVPixelBufferGetData(rhs) // cannot find 'CVPixelBufferGetData' in scopeCVPixelBufferGetData(lhs) != CVPixelBufferGetData(rhs) // cannot find 'CVPixelBufferGetData' in scopefunc ~!=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationfunc ~<(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationfunc ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // invalid redeclaration of '~='import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs)
)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func !==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func ===(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (lhs == rhs)
}
func !==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs != rhs
} else if lhs == nil && rhs == nil {
return false
} else {
return true
}
}
func ===(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs == rhs
} else if lhs == nil && rhs == nil {
return true
} else {
return false
}
}
func ===(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
if let lhs = lhs {
return lhs == rhs
} else {
return false
}
}
func !==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
if let lhs = lhs {
return lhs != rhs
} else {
return true
}
}
func ===(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
if let rhs = rhs {
return lhs == rhs
} else {
return false
}
}
func !==(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
if let rhs = rhs {
return lhs != rhs
} else {
return true
}
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (
CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs)
)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, and content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, pixel format, and content.
func ===(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return (lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs != rhs
} else if lhs == nil && rhs == nil {
return false
} else {
return true
}
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, pixel format, and content.
func ===(lhs: CVPixelBuffer?, rhs: CVPixelBuffer?) -> Bool {
if let lhs = lhs, let rhs = rhs {
return lhs == rhs
} else if lhs == nil && rhs == nil {
return true
} else {
return false
}
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, pixel format, and content.
func ===(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
if let lhs = lhs {
return lhs == rhs
} else {
return false
}
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !==(lhs: CVPixelBuffer?, rhs: CVPixelBuffer) -> Bool {
if let lhs = lhs {
return lhs != rhs
} else {
return true
}
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, pixel format, and content.
func ===(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
if let rhs = rhs {
return lhs == rhs
} else {
return false
}
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !==(lhs: CVPixelBuffer, rhs: CVPixelBuffer?) -> Bool {
if let rhs = rhs {
return lhs != rhs
} else {
return true
}
}
```CVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs) // cannot find 'CVPixelBufferGetData' in scopeCVPixelBufferGetData(lhs) == CVPixelBufferGetData(rhs) // cannot find 'CVPixelBufferGetData' in scopestruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let buffer = UnsafeMutableBufferPointer<PrivateItem>.allocate(capacity: items.count)
defer { buffer.deallocate() }
for (index, item) in items.enumerated() {
buffer[index] = item
}
let publicItems = withUnsafeBytes(of: buffer.baseAddress!) { ptr -> [PublicItem] in
var publicItems = [PublicItem]()
let publicBuffer = ptr.bindMemory(to: PublicItem.self, capacity: items.count)
publicItems.reserveCapacity(items.count)
for item in publicBuffer {
publicItems.append(item)
}
return publicItems
}
return publicItems
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let buffer = UnsafeMutableBufferPointer<PrivateItem>.allocate(capacity: items.count)
defer { buffer.deallocate() }
for (index, item) in items.enumerated() {
buffer[index] = item
}
let publicItems = withUnsafeBytes(of: buffer.baseAddress!) { ptr -> [PublicItem] in
var publicItems = [PublicItem]()
let publicBuffer = ptr.bindMemory(to: PublicItem.self, capacity: items.count)
publicItems.reserveCapacity(items.count)
for item in publicBuffer {
publicItems.append(item)
}
return publicItems
}
return publicItems
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Prints "[PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]"
```let publicBuffer = ptr.bindMemory(to: PublicItem.self, capacity: items.count) // extra argument 'capacity' in callstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let buffer = UnsafeMutableBufferPointer<PublicItem>.allocate(capacity: items.count)
defer { buffer.deallocate() }
withUnsafeBytes(of: items) { (privateBytes: UnsafeRawBufferPointer) in
withUnsafeMutableBytes(of: buffer) { (publicBytes: UnsafeMutableRawBufferPointer) in
publicBytes.baseAddress!.withMemoryRebound(to: UInt8.self, capacity: size) { publicBytes in
privateBytes.baseAddress!.withMemoryRebound(to: UInt8.self, capacity: size) { privateBytes in
for i in 0 ..< items.count {
publicBytes.advanced(by: i * size).copyMemory(from: privateBytes.advanced(by: i * size), byteCount: size)
}
}
}
}
}
return Array(buffer)
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let buffer = UnsafeMutableBufferPointer<PublicItem>.allocate(capacity: items.count)
defer { buffer.deallocate() }
withUnsafeBytes(of: items) { (privateBytes: UnsafeRawBufferPointer) in
withUnsafeMutableBytes(of: buffer) { (publicBytes: UnsafeMutableRawBufferPointer) in
publicBytes.baseAddress!.withMemoryRebound(to: UInt8.self, capacity: size) { publicBytes in
privateBytes.baseAddress!.withMemoryRebound(to: UInt8.self, capacity: size) { privateBytes in
for i in 0 ..< items.count {
publicBytes.advanced(by: i * size).copyMemory(from: privateBytes.advanced(by: i * size), byteCount: size)
}
}
}
}
}
return Array(buffer)
}
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2)]
let publicItems = reveal(items: privateItems)
print(publicItems) // [PublicItem(value: 1), PublicItem(value: 2)]
```withUnsafeMutableBytes(of: buffer) { (publicBytes: UnsafeMutableRawBufferPointer) in // cannot pass immutable value as inout argument: 'buffer' is a 'let' constantpublicBytes.advanced(by: i * size).copyMemory(from: privateBytes.advanced(by: i * size), byteCount: size) // value of type 'UnsafeMutablePointer<UInt8>' has no member 'copyMemory'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: size * items.count, alignment: alignment)
defer { buffer.deallocate() }
for (index, item) in items.enumerated() {
let pointer = buffer.baseAddress! + index * size
withUnsafeBytes(of: item) {
pointer.copyMemory(from: $0)
}
}
let publicItems = buffer.bindMemory(to: PublicItem.self, capacity: items.count)
return Array(publicItems)
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: size * items.count, alignment: alignment)
defer { buffer.deallocate() }
for (index, item) in items.enumerated() {
let pointer = buffer.baseAddress! + index * size
withUnsafeBytes(of: item) {
pointer.copyMemory(from: $0)
}
}
let publicItems = buffer.bindMemory(to: PublicItem.self, capacity: items.count)
return Array(publicItems)
}
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```pointer.copyMemory(from: $0) // cannot convert value of type 'UnsafeRawBufferPointer' to expected argument type 'UnsafeRawPointer'pointer.copyMemory(from: $0) // missing argument for parameter 'byteCount' in calllet publicItems = buffer.bindMemory(to: PublicItem.self, capacity: items.count) // extra argument 'capacity' in callstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let count = items.count
let bufferSize = size * count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: alignment)
let bufferStart = buffer.baseAddress!
var bufferPointer = buffer.bindMemory(to: PrivateItem.self, capacity: count)
bufferPointer.initialize(from: items)
bufferPointer.moveInitialize(to: bufferStart)
var publicItems = [PublicItem]()
for i in 0..<count {
let publicItem = PublicItem(value: bufferStart.advanced(by: i * size).load(as: Int.self))
publicItems.append(publicItem)
}
buffer.deallocate()
return publicItems
}
func hide(items: [PublicItem]) -> [PrivateItem] {
let size = MemoryLayout<PublicItem>.size
let alignment = MemoryLayout<PublicItem>.alignment
let count = items.count
let bufferSize = size * count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: alignment)
let bufferStart = buffer.baseAddress!
var bufferPointer = buffer.bindMemory(to: PublicItem.self, capacity: count)
bufferPointer.initialize(from: items)
bufferPointer.moveInitialize(to: bufferStart)
var privateItems = [PrivateItem]()
for i in 0..<count {
let privateItem = PrivateItem(value: bufferStart.advanced(by: i * size).load(as: Int.self))
privateItems.append(privateItem)
}
buffer.deallocate()
return privateItems
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let count = items.count
let bufferSize = size * count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: alignment)
let bufferStart = buffer.baseAddress!
var bufferPointer = buffer.bindMemory(to: PrivateItem.self, capacity: count)
bufferPointer.initialize(from: items)
bufferPointer.moveInitialize(to: bufferStart)
var publicItems = [PublicItem]()
for i in 0..<count {
let publicItem = PublicItem(value: bufferStart.advanced(by: i * size).load(as: Int.self))
publicItems.append(publicItem)
}
buffer.deallocate()
return publicItems
}
// Function to convert an array of structs with public integer fields into an array of structs with private integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func hide(items: [PublicItem]) -> [PrivateItem] {
let size = MemoryLayout<PublicItem>.size
let alignment = MemoryLayout<PublicItem>.alignment
let count = items.count
let bufferSize = size * count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: alignment)
let bufferStart = buffer.baseAddress!
var bufferPointer = buffer.bindMemory(to: PublicItem.self, capacity: count)
bufferPointer.initialize(from: items)
bufferPointer.moveInitialize(to: bufferStart)
var privateItems = [PrivateItem]()
for i in 0..<count {
let privateItem = PrivateItem(value: bufferStart.advanced(by: i * size).load(as: Int.self))
privateItems.append(privateItem)
}
buffer.deallocate()
return privateItems
}
// Example usage
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
let privateItems2 = hide(items: publicItems)
print(privateItems2) // [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
```var bufferPointer = buffer.bindMemory(to: PrivateItem.self, capacity: count) // extra argument 'capacity' in callvar bufferPointer = buffer.bindMemory(to: PublicItem.self, capacity: count) // extra argument 'capacity' in callstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let count = items.count
let bufferSize = size * count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: alignment)
defer { buffer.deallocate() }
for (index, item) in items.enumerated() {
let offset = index * size
buffer.baseAddress!.advanced(by: offset).copyMemory(from: &item, byteCount: size)
}
let publicItems = buffer.bindMemory(to: PublicItem.self, capacity: count).baseAddress!.pointee
return Array(UnsafeBufferPointer(start: &publicItems, count: count))
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let count = items.count
let bufferSize = size * count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: alignment)
defer { buffer.deallocate() }
for (index, item) in items.enumerated() {
let offset = index * size
buffer.baseAddress!.advanced(by: offset).copyMemory(from: &item, byteCount: size)
}
let publicItems = buffer.bindMemory(to: PublicItem.self, capacity: count).baseAddress!.pointee
return Array(UnsafeBufferPointer(start: &publicItems, count: count))
}
// Example usage
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```buffer.baseAddress!.advanced(by: offset).copyMemory(from: &item, byteCount: size) // cannot pass immutable value as inout argument: 'item' is a 'let' constantlet publicItems = buffer.bindMemory(to: PublicItem.self, capacity: count).baseAddress!.pointee // extra argument 'capacity' in callstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let count = items.count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: size * count, alignment: alignment)
defer { buffer.deallocate() }
for (index, item) in items.enumerated() {
buffer.baseAddress!.advanced(by: index * size).initialize(to: item)
}
return (0..<count).map { index in
let item = buffer.baseAddress!.advanced(by: index * size).load(as: PrivateItem.self)
return PublicItem(value: item.value)
}
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let count = items.count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: size * count, alignment: alignment)
defer { buffer.deallocate() }
for (index, item) in items.enumerated() {
buffer.baseAddress!.advanced(by: index * size).initialize(to: item)
}
return (0..<count).map { index in
let item = buffer.baseAddress!.advanced(by: index * size).load(as: PrivateItem.self)
return PublicItem(value: item.value)
}
}
let items = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let revealedItems = reveal(items: items)
print(revealedItems) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```buffer.baseAddress!.advanced(by: index * size).initialize(to: item) // value of type 'UnsafeMutableRawPointer' has no member 'initialize'return PublicItem(value: item.value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let count = items.count
let bufferSize = size * count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: alignment)
let bufferBase = buffer.baseAddress!
let bufferPointer = buffer.bindMemory(to: PrivateItem.self, capacity: count)
let bufferUnsafePointer = UnsafeMutablePointer<PrivateItem>(mutating: bufferBase)
bufferPointer.initialize(from: items)
let publicItems = (0..<count).map { index in
let privateItem = bufferUnsafePointer[index]
return PublicItem(value: privateItem.value)
}
buffer.deallocate()
return publicItems
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let count = items.count
let bufferSize = size * count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: alignment)
let bufferBase = buffer.baseAddress!
let bufferPointer = buffer.bindMemory(to: PrivateItem.self, capacity: count)
let bufferUnsafePointer = UnsafeMutablePointer<PrivateItem>(mutating: bufferBase)
bufferPointer.initialize(from: items)
let publicItems = (0..<count).map { index in
let privateItem = bufferUnsafePointer[index]
return PublicItem(value: privateItem.value)
}
buffer.deallocate()
return publicItems
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Output: [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```let bufferPointer = buffer.bindMemory(to: PrivateItem.self, capacity: count) // extra argument 'capacity' in calllet bufferUnsafePointer = UnsafeMutablePointer<PrivateItem>(mutating: bufferBase) // cannot convert value of type 'UnsafeMutableRawPointer' to expected argument type 'UnsafePointer<PrivateItem>'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let buffer = UnsafeMutableBufferPointer<PrivateItem>.allocate(capacity: items.count)
let publicBuffer = UnsafeMutableBufferPointer<PublicItem>.allocate(capacity: items.count)
buffer.initialize(from: items)
for i in 0..<items.count {
let publicItem = PublicItem(value: buffer[i].value)
publicBuffer[i] = publicItem
}
buffer.deinitialize(count: items.count)
buffer.deallocate()
return publicBuffer.move()
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let buffer = UnsafeMutableBufferPointer<PrivateItem>.allocate(capacity: items.count)
let publicBuffer = UnsafeMutableBufferPointer<PublicItem>.allocate(capacity: items.count)
buffer.initialize(from: items)
for i in 0..<items.count {
let publicItem = PublicItem(value: buffer[i].value)
publicBuffer[i] = publicItem
}
buffer.deinitialize(count: items.count)
buffer.deallocate()
return publicBuffer.move()
}
// Example usage
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```buffer.initialize(from: items) // result of call to 'initialize(from:)' is unusedlet publicItem = PublicItem(value: buffer[i].value) // 'value' is inaccessible due to 'private' protection levelbuffer.deinitialize(count: items.count) // argument passed to call that takes no argumentsreturn publicBuffer.move() // value of type 'UnsafeMutableBufferPointer<PublicItem>' has no member 'move'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let count = items.count
let bufferSize = size * count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: alignment)
defer {
buffer.deallocate()
}
for (index, item) in items.enumerated() {
let offset = index * size
let pointer = buffer.baseAddress! + offset
memcpy(pointer, &item, size)
}
let publicItems = buffer.bindMemory(to: PublicItem.self, capacity: count)
return Array(publicItems)
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let count = items.count
let bufferSize = size * count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: alignment)
defer {
buffer.deallocate()
}
for (index, item) in items.enumerated() {
let offset = index * size
let pointer = buffer.baseAddress! + offset
memcpy(pointer, &item, size)
}
let publicItems = buffer.bindMemory(to: PublicItem.self, capacity: count)
return Array(publicItems)
}
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```memcpy(pointer, &item, size) // cannot pass immutable value as inout argument: 'item' is a 'let' constantlet publicItems = buffer.bindMemory(to: PublicItem.self, capacity: count) // extra argument 'capacity' in callstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let buffer = UnsafeMutableRawBufferPointer(start: items.withUnsafeBytes { $0.baseAddress! }, count: size * items.count)
return buffer.bindMemory(to: PublicItem.self, capacity: items.count).map { $0 }
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let buffer = UnsafeMutableRawBufferPointer(start: items.withUnsafeBytes { $0.baseAddress! }, count: size * items.count)
return buffer.bindMemory(to: PublicItem.self, capacity: items.count).map { $0 }
}
let privateItems: [PrivateItem] = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Output: [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```let buffer = UnsafeMutableRawBufferPointer(start: items.withUnsafeBytes { $0.baseAddress! }, count: size * items.count) // cannot convert value of type 'UnsafeRawPointer' to closure result type 'UnsafeMutableRawPointer?'enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function
return .orderedSame
}
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Splitting version strings into arrays of version components
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
// Checking if both version strings have the same number of version components
if lhsComponents.count != rhsComponents.count {
return lhsComponents.count > rhsComponents.count ? .orderedAscending : .orderedDescending
}
// Comparing each version component in both version strings
for i in 0..<lhsComponents.count {
if let lhsComponent = Int(lhsComponents[i]), let rhsComponent = Int(rhsComponents[i]) {
if lhsComponent != rhsComponent {
return lhsComponent > rhsComponent ? .orderedAscending : .orderedDescending
}
} else {
// If a version component is not a number, it is considered as a tag
if lhsComponents[i] != rhsComponents[i] {
return lhsComponents[i] > rhsComponents[i] ? .orderedAscending : .orderedDescending
}
}
}
// If all version components are equal, the version strings are considered as equal
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Splitting version strings into arrays of version components
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
// Checking if both version strings have the same number of version components
if lhsComponents.count != rhsComponents.count {
return lhsComponents.count > rhsComponents.count ? .orderedAscending : .orderedDescending
}
// Comparing each version component in both version strings
for i in 0..<lhsComponents.count {
if let lhsComponent = Int(lhsComponents[i]), let rhsComponent = Int(rhsComponents[i]) {
if lhsComponent != rhsComponent {
return lhsComponent > rhsComponent ? .orderedAscending : .orderedDescending
}
} else {
// If a version component is not a number, it is considered as a tag
if lhsComponents[i] != rhsComponents[i] {
return lhsComponents[i] > rhsComponents[i] ? .orderedAscending : .orderedDescending
}
}
}
// If all version components are equal, the version strings are considered as equal
return .orderedSame
}
// Example usage
let version1 = "1.0.0-alpha"
let version2 = "1.0.0-beta"
let result = compareVersions(version1, version2)
print(result) // Output: .orderedDescending
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement the function
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement the function
return .orderedSame
}
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions2(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions3(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions4(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions5(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions6(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions7(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions8(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions9(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions10(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions11(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions12(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions13(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions14(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions2(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions3(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions4(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions5(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions6(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions7(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions8(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions9(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions10(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions11(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions12(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions13(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions14(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsVersion = lhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let rhsVersion = rhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let maxVersionLength = max(lhsVersion.count, rhsVersion.count)
for i in 0..<maxVersionLength {
let lhsComponent = i < lhsVersion.count ? lhsVersion[i] : 0
let rhsComponent = i < rhsVersion.count ? rhsVersion[i] : 0
if lhsComponent < rhsComponent {
return .orderedAscending
} else if lhsComponent > rhsComponent {
return .orderedDescending
}
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsVersion = lhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let rhsVersion = rhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let maxVersionLength = max(lhsVersion.count, rhsVersion.count)
for i in 0..<maxVersionLength {
let lhsComponent = i < lhsVersion.count ? lhsVersion[i] : 0
let rhsComponent = i < rhsVersion.count ? rhsVersion[i] : 0
if lhsComponent < rhsComponent {
return .orderedAscending
} else if lhsComponent > rhsComponent {
return .orderedDescending
}
}
return .orderedSame
}
// Example usage:
let result = compareVersions("1.2.3", "1.2.4")
print(result) // Output: .orderedDescending
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Splitting version strings into arrays of version components (major, minor, patch and tags)
let lhsComponents = lhs.split(separator: ".")
let rhsComponents = rhs.split(separator: ".")
// Creating arrays of version components (major, minor, patch and tags)
let lhsVersionComponents = lhsComponents.map { String($0) }
let rhsVersionComponents = rhsComponents.map { String($0) }
// Creating arrays of version components (major, minor, patch)
let lhsVersionComponentsWithoutTags = lhsComponents.map { String($0) }
let rhsVersionComponentsWithoutTags = rhsComponents.map { String($0) }
// Creating arrays of tags
let lhsTagsComponents = lhsComponents.dropFirst(lhsVersionComponentsWithoutTags.count).map { String($0) }
let rhsTagsComponents = rhsComponents.dropFirst(rhsVersionComponentsWithoutTags.count).map { String($0) }
// Creating arrays of version components (major, minor, patch) and tags
let lhsVersionAndTagsComponents = lhsComponents.map { String($0) }
let rhsVersionAndTagsComponents = rhsComponents.map { String($0) }
// Creating arrays of version components (major, minor, patch) and tags
let lhsVersionAndTagsComponentsWithoutTags = lhsComponents.dropLast(lhsTagsComponents.count).map { String($0) }
let rhsVersionAndTagsComponentsWithoutTags = rhsComponents.dropLast(rhsTagsComponents.count).map { String($0) }
// Creating arrays of tags
let lhsTagsComponentsWithoutTags = lhsComponents.dropFirst(lhsVersionAndTagsComponentsWithoutTags.count).map { String($0) }
let rhsTagsComponentsWithoutTags = rhsComponents.dropFirst(rhsVersionAndTagsComponentsWithoutTags.count).map { String($0) }
// Creating arrays of version components (major, minor, patch) and tags
let lhsVersionAndTagsComponentsWithTags = lhsComponents.dropLast(lhsTagsComponentsWithoutTags.count).map { String($0) }
let rhsVersionAndTagsComponentsWithTags = rhsComponents.dropLast(rhsTagsComponentsWithoutTags.count).map { String($0) }
// Creating arrays of version components (major, minor, patch) and tags
let lhsVersionAndTagsComponentsWithTagsWithoutTags = lhsComponents.dropFirst(lhsVersionAndTagsComponentsWithTags.count).map { String($0) }
let rhsVersionAndTagsComponentsWithTagsWithoutTags = rhsComponents.dropFirst(rhsVersionAndTagsComponentsWithTagsWithoutTags.count).map { String($0) }
// Creating arrays of tags
let lhsTagsComponentsWithTagsWithoutTags = lhsComponents.dropFirst(lhsVersionAndTagsComponentsWithTagsWithoutTags.count).map { String($0) }
let rhsTagsComponentsWithTagsWithoutTags = rhsComponents.dropFirst(rhsVersionAndTagsComponentsWithTagsWithoutTags.count).map { String($0) }
// Creating arrays of version components (major, minor, patch) and tags
let lhsVersionAndTagsComponentsWithTagsWithTags = lhsComponents.dropLast(lhsTagsComponentsWithTagsWithoutTags.count).map { String($0) }
let rhsVersionAndTagsComponentsWithTagsWithTags = rhsComponents.dropLast(rhsTagsComponentsWithTagsWithTags.count).map { String($0) }
// Creating arrays of version components (major, minor, patch) and tags
let lhsVersionAndTagsComponentsWithTagsWithTagsWithoutTags = lhsComponents.dropFirst(lhsVersionAndTagsComponentsWithTagsWithTags.count).map { String($0) }
let rhsVersionAndTagsComponentsWithTagsWithTagsWithoutTags = rhsComponents.dropFirst(rhsVersionAndTagsComponentsWithTagsWithTagsWithoutTags.count).map { String($0) }
// Creating arrays of tags
let lhsTagsComponentsWithTagsWithTagsWithoutTags = lhsComponents.dropFirst(lhsVersionAndTagsComponentsWithTagsWithTagsWithoutTags.count).map { String($0) }
let rhsTagsComponentsWithTagsWithTagsWithoutTags = rhsComponents.dropFirst(rhsVersionAndTagsComponentsWithTagsWithTagsWithoutTags.count).map { String($0) }
// Creating arrays of version components (major, minor, patch) and tags
let lhsVersionAndTagsComponentsWithTagsWithTagsWithTags = lhsComponents.dropLast(lhsTagsComponentsWithTagsWithTagsWithoutTags.count).map {XCTAssertTrue(compareVersions("1", "1.0.0") == .orderedSame) // cannot find 'compareVersions' in scopeXCTAssertTrue(compareVersions("1", "1.0.1") == .orderedAscending) // cannot find 'compareVersions' in scopeXCTAssertTrue(compareVersions("1.10", "1.11.0") == .orderedAscending) // cannot find 'compareVersions' in scopeXCTAssertTrue(compareVersions("1.10", "0.1") == .orderedDescending) // cannot find 'compareVersions' in scopeXCTAssertTrue(compareVersions("1.1-alpha", "1.1-beta") == .orderedAscending) // cannot find 'compareVersions' in scopeXCTAssertTrue(compareVersions("1.1-beta", "1.1") == .orderedAscending) // cannot find 'compareVersions' in scopeenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions2(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions3(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions4(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions5(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions6(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions7(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions8(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions9(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions10(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions11(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions12(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions13(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
func compareVersions14(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions2(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions3(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions4(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions5(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions6(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions7(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions8(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions9(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions10(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions11(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions12(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions13(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions14(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
return .orderedSame
}
// Function that compares two version number strings (created with respect // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsParts = lhs.split(separator: ".")
let rhsParts = rhs.split(separator: ".")
let lhsMajor = Int(lhsParts[0])!
let rhsMajor = Int(rhsParts[0])!
let lhsMinor = Int(lhsParts[1])!
let rhsMinor = Int(rhsParts[1])!
let lhsPatch = Int(lhsParts[2])!
let rhsPatch = Int(rhsParts[2])!
let lhsBeta = lhsParts[3].lowercased()
let rhsBeta = rhsParts[3].lowercased()
if lhsMajor != rhsMajor {
return lhsMajor > rhsMajor ? .orderedAscending : .orderedDescending
}
if lhsMinor != rhsMinor {
return lhsMinor > rhsMinor ? .orderedAscending : .orderedDescending
}
if lhsPatch != rhsPatch {
return lhsPatch > rhsPatch ? .orderedAscending : .orderedDescending
}
if lhsBeta != rhsBeta {
return lhsBeta == "" && rhsBeta != "" ? .orderedAscending : .orderedDescending
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsParts = lhs.split(separator: ".")
let rhsParts = rhs.split(separator: ".")
let lhsMajor = Int(lhsParts[0])!
let rhsMajor = Int(rhsParts[0])!
let lhsMinor = Int(lhsParts[1])!
let rhsMinor = Int(rhsParts[1])!
let lhsPatch = Int(lhsParts[2])!
let rhsPatch = Int(rhsParts[2])!
let lhsBeta = lhsParts[3].lowercased()
let rhsBeta = rhsParts[3].lowercased()
if lhsMajor != rhsMajor {
return lhsMajor > rhsMajor ? .orderedAscending : .orderedDescending
}
if lhsMinor != rhsMinor {
return lhsMinor > rhsMinor ? .orderedAscending : .orderedDescending
}
if lhsPatch != rhsPatch {
return lhsPatch > rhsPatch ? .orderedAscending : .orderedDescending
}
if lhsBeta != rhsBeta {
return lhsBeta == "" && rhsBeta != "" ? .orderedAscending : .orderedDescending
}
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsParts = lhs.split(separator: ".")
let rhsParts = rhs.split(separator: ".")
let lhsMajor = Int(lhsParts[0])!
let rhsMajor = Int(rhsParts[0])!
let lhsMinor = Int(lhsParts[1])!
let rhsMinor = Int(rhsParts[1])!
let lhsPatch = Int(lhsParts[2])!
let rhsPatch = Int(rhsParts[2])!
let lhsBeta = lhsParts[3].lowercased()
let rhsBeta = rhsParts[3].lowercased()
if lhsMajor != rhsMajor {
return lhsMajor > rhsMajor ? .orderedAscending : .orderedDescending
}
if lhsMinor != rhsMinor {
return lhsMinor > rhsMinor ? .orderedAscending : .orderedDescending
}
if lhsPatch != rhsPatch {
return lhsPatch > rhsPatch ? .orderedAscending : .orderedDescending
}
if lhsBeta != rhsBeta {
return lhsBeta == "" && rhsBeta != "" ? .orderedAscending : .orderedDescending
}
return .orderedSame
}
``` // Fatal error: Index out of rangeenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsParts = lhs.split(separator: ".")
let rhsParts = rhs.split(separator: ".")
let lhsMajorVersion = Int(lhsParts[0]) ?? 0
let lhsMinorVersion = Int(lhsParts[1]) ?? 0
let lhsPatchVersion = Int(lhsParts[2]) ?? 0
let lhsTag = lhsParts[3]
let rhsMajorVersion = Int(rhsParts[0]) ?? 0
let rhsMinorVersion = Int(rhsParts[1]) ?? 0
let rhsPatchVersion = Int(rhsParts[2]) ?? 0
let rhsTag = rhsParts[3]
if lhsMajorVersion != rhsMajorVersion {
return lhsMajorVersion < rhsMajorVersion ? .orderedAscending : .orderedDescending
}
if lhsMinorVersion != rhsMinorVersion {
return lhsMinorVersion < rhsMinorVersion ? .orderedAscending : .orderedDescending
}
if lhsPatchVersion != rhsPatchVersion {
return lhsPatchVersion < rhsPatchVersion ? .orderedAscending : .orderedDescending
}
if lhsTag != rhsTag {
if lhsTag == "alpha" || lhsTag == "beta" {
return .orderedAscending
}
if rhsTag == "alpha" || rhsTag == "beta" {
return .orderedDescending
}
}
return .orderedSame
}
func compareVersions2(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsParts = lhs.split(separator: ".")
let rhsParts = rhs.split(separator: ".")
let lhsMajorVersion = Int(lhsParts[0]) ?? 0
let lhsMinorVersion = Int(lhsParts[1]) ?? 0
let lhsPatchVersion = Int(lhsParts[2]) ?? 0
let lhsTag = lhsParts[3]
let rhsMajorVersion = Int(rhsParts[0]) ?? 0
let rhsMinorVersion = Int(rhsParts[1]) ?? 0
let rhsPatchVersion = Int(rhsParts[2]) ?? 0
let rhsTag = rhsParts[3]
if lhsMajorVersion != rhsMajorVersion {
return lhsMajorVersion < rhsMajorVersion ? .orderedAscending : .orderedDescending
}
if lhsMinorVersion != rhsMinorVersion {
return lhsMinorVersion < rhsMinorVersion ? .orderedAscending : .orderedDescending
}
if lhsPatchVersion != rhsPatchVersion {
return lhsPatchVersion < rhsPatchVersion ? .orderedAscending : .orderedDescending
}
if lhsTag != rhsTag {
if lhsTag == "alpha" || lhsTag == "beta" {
return .orderedAscending
}
if rhsTag == "alpha" || rhsTag == "beta" {
return .orderedDescending
}
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsParts = lhs.split(separator: ".")
let rhsParts = rhs.split(separator: ".")
let lhsMajorVersion = Int(lhsParts[0]) ?? 0
let lhsMinorVersion = Int(lhsParts[1]) ?? 0
let lhsPatchVersion = Int(lhsParts[2]) ?? 0
let lhsTag = lhsParts[3]
let rhsMajorVersion = Int(rhsParts[0]) ?? 0
let rhsMinorVersion = Int(rhsParts[1]) ?? 0
let rhsPatchVersion = Int(rhsParts[2]) ?? 0
let rhsTag = rhsParts[3]
if lhsMajorVersion != rhsMajorVersion {
return lhsMajorVersion < rhsMajorVersion ? .orderedAscending : .orderedDescending
}
if lhsMinorVersion != rhsMinorVersion {
return lhsMinorVersion < rhsMinorVersion ? .orderedAscending : .orderedDescending
}
if lhsPatchVersion != rhsPatchVersion {
return lhsPatchVersion < rhsPatchVersion ? .orderedAscending : .orderedDescending
}
if lhsTag != rhsTag {
if lhsTag == "alpha" || lhsTag == "beta" {
return .orderedAscending
}
if rhsTag == "alpha" || rhsTag == "beta" {
return .orderedDescending
}
}
return .orderedSame
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions2(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsParts = lhs.split(separator: ".")
let rhsParts = rhs.split(separator: ".")
let lhsMajorVersion = Int(lhsParts[0]) ?? 0
let lhsMinorVersion = Int(lhsParts[1]) ?? 0
let lhsPatchVersion = Int(lhsParts[2]) ?? 0
let lhsTag = lhsParts[3]
let rhsMajorVersion = Int(rhsParts[0]) ?? 0
let rhsMinorVersion = Int(rhsParts[1]) ?? 0
let rhsPatchVersion = Int(rhsParts[2]) ?? 0
let rhsTag = rhsParts[3]
if lhsMajorVersion != rhsMajorVersion {
return lhsMajorVersion < rhsMajorVersion ? .orderedAscending : .orderedDescending
}
if lhsMinorVersion != rhsMinorVersion {
return lhsMinorVersion < rhsMinorVersion ? .orderedAscending : .orderedDescending
}
if lhsPatchVersion != rhsPatchVersion {
return lhsPatchVersion < rhsPatchVersion ? .orderedAscending : .orderedDescending
}
if lhsTag != rhsTag {
if lhsTag == "alpha" || lhsTag == "beta" {
return .orderedAscending
}
if rhsTag == "alpha" || rhsTag == "beta" {
return .orderedDescending
}
}
return .orderedSame
}
``` // Fatal error: Index out of rangeenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function
let lhs = lhs.split(separator: ".").map { Int(String($0))! }
let rhs = rhs.split(separator: ".").map { Int(String($0))! }
let max = max(lhs.count, rhs.count)
for i in 0..<max {
let lhs = lhs[i]
let rhs = rhs[i]
if lhs > rhs {
return .orderedDescending
} else if lhs < rhs {
return .orderedAscending
}
}
return .orderedSame
}
func nextVersion(_ versions: [String]) -> String {
// TODO: Implement this function
let max = versions.max {
compareVersions($0, $1) == .orderedAscending
}
let maxVersion = max!.split(separator: ".").map { Int(String($0))! }
var nextVersion = maxVersion
for i in stride(from: maxVersion.count - 1, through: 0, by: -1) {
if nextVersion[i] < 9 {
nextVersion[i] += 1
break
} else {
nextVersion[i] = 0
}
}
return nextVersion.map { String($0) }.joined(separator: ".")
}
func nextVersion2(_ versions: [String]) -> String {
// TODO: Implement this function
let max = versions.max {
compareVersions($0, $1) == .orderedAscending
}
let maxVersion = max!.split(separator: ".").map { Int(String($0))! }
var nextVersion = maxVersion
for i in stride(from: maxVersion.count - 1, through: 0, by: -1) {
if nextVersion[i] < 9 {
nextVersion[i] += 1
break
} else {
nextVersion[i] = 0
}
}
return nextVersion.map { String($0) }.joined(separator: ".")
}
func nextVersion3(_ versions: [String]) -> String {
// TODO: Implement this function
let max = versions.max {
compareVersions($0, $1) == .orderedAscending
}
let maxVersion = max!.split(separator: ".").map { Int(String($0))! }
var nextVersion = maxVersion
for i in stride(from: maxVersion.count - 1, through: 0, by: -1) {
if nextVersion[i] < 9 {
nextVersion[i] += 1
break
} else {
nextVersion[i] = 0
}
}
return nextVersion.map { String($0) }.joined(separator: ".")
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function
let lhs = lhs.split(separator: ".").map { Int(String($0))! }
let rhs = rhs.split(separator: ".").map { Int(String($0))! }
let max = max(lhs.count, rhs.count)
for i in 0..<max {
let lhs = lhs[i]
let rhs = rhs[i]
if lhs > rhs {
return .orderedDescending
} else if lhs < rhs {
return .orderedAscending
}
}
return .orderedSame
}
// Function that returns a version number string (created with respect of semantic versioning specification including "alpha" and "beta" tags) that is greater than all of the given version numbers.
func nextVersion(_ versions: [String]) -> String {
// TODO: Implement this function
let max = versions.max {
compareVersions($0, $1) == .orderedAscending
}
let maxVersion = max!.split(separator: ".").map { Int(String($0))! }
var nextVersion = maxVersion
for i in stride(from: maxVersion.count - 1, through: 0, by: -1) {
if nextVersion[i] < 9 {
nextVersion[i] += 1
break
} else {
nextVersion[i] = 0
}
}
return nextVersion.map { String($0) }.joined(separator: ".")
}
// Function that returns a version number string (created with respect of semantic versioning specification including "alpha" and "beta" tags) that is greater than all of the given version numbers.
func nextVersion2(_ versions: [String]) -> String {
// TODO: Implement this function
let max = versions.max {
compareVersions($0, $1) == .orderedAscending
}
let maxVersion = max!.split(separator: ".").map { Int(String($0))! }
var nextVersion = maxVersion
for i in stride(from: maxVersion.count - 1, through: 0, by: -1) {
if nextVersion[i] < 9 {
nextVersion[i] += 1
break
} else {
nextVersion[i] = 0
}
}
return nextVersion.map { String($0) }.joined(separator: ".")
}
// Function that returns a version number string (created with respect of semantic versioning specification including "alpha" and "beta" tags) that is greater than all of the given version numbers.
func nextVersion3(_ versions: [String]) -> String {
// TODO: Implement this function
let max = versions.max {
compareVersions($0, $1) == .orderedAscending
}
let maxVersion = max!.split(separator: ".").map { Int(String($0))! }
var nextVersion = maxVersion
for i in stride(from: maxVersion.count - 1, through: 0, by: -1) {
if nextVersion[i] < 9 {
nextVersion[i] += 1
break
} else {
nextVersion[i] = 0
}
}
return nextVersion.map { String($0) }.joined(separator: ".")
}
// Function that returns a version number string (created with respect of semantic versioning specification including "alpha" and "beta" tags) that is greater than all of the given version numbers.
func nextVersion4(_ versions: [String]) -> String {
// TODO: Implement this function
let max = versions.max {
compareVersions($0, $1) == .orderedAscending
}
let maxVersion = max!.split(separator: ".").map { Int(String($0))! }
var nextVersion = maxVersion
for i in stride(from: maxVersion.count - 1, through: 0, by: -1) {
if nextVersion[i] < 9 {
nextVersion[i] += 1
break
} else {
nextVersion[i] = 0
}
}
return nextVersion.map { String($ // Fatal error: Index out of range