Metadata
| Key | Value |
|---|---|
| engine | transformers |
| 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 {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}```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 {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}
do {
let json = try parse(string: "{ \"name\": \"John\" }")
print(json)
} catch ParsingError.invalidInput {
print("Invalid input")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
}
```return try decoder.decode(JSON.self, from: data) // type 'Any' cannot conform to 'Decodable'typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}```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 {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}
do {
let json = try parse(string: "{ \"foo\": 42 }")
print(json)
} catch ParsingError.invalidInput {
print("Invalid input")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
}
```return try decoder.decode(JSON.self, from: data) // type 'Any' cannot conform to 'Decodable'typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}```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 {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}
// Example of usage
do {
let json = try parse(string: "{\"a\": 1}")
print(json)
} catch ParsingError.invalidInput {
print("Invalid input")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
}
```return try decoder.decode(JSON.self, from: data) // type 'Any' cannot conform to 'Decodable'typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
// ...
}```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 {
// ...
}
// Usage
do {
let json = try parse(string: "...")
// ...
} catch ParsingError.invalidInput {
// ...
} catch ParsingError.internalError(let error) {
// ...
}
```} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}```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 {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}
do {
let json = try parse(string: "{ \"name\": \"John\" }")
print(json)
} catch ParsingError.invalidInput {
print("Invalid input")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
}
```return try decoder.decode(JSON.self, from: data) // type 'Any' cannot conform to 'Decodable'typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}```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 {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}
do {
let json = try parse(string: "{ \"foo\": 42 }")
print(json)
} catch ParsingError.invalidInput {
print("Invalid input")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
}
```return try decoder.decode(JSON.self, from: data) // type 'Any' cannot conform to 'Decodable'typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}```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 {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}
do {
let json = try parse(string: "invalid JSON")
print(json)
} catch ParsingError.invalidInput {
print("Invalid input")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
}
```return try decoder.decode(JSON.self, from: data) // type 'Any' cannot conform to 'Decodable'typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}```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 {
let data = Data(string.utf8)
let decoder = JSONDecoder()
return try decoder.decode(JSON.self, from: data)
}
do {
let json = try parse(string: "{ \"name\": \"John\" }")
print(json)
} catch ParsingError.invalidInput {
print("Invalid input")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
}
```return try decoder.decode(JSON.self, from: data) // type 'Any' cannot conform to 'Decodable'typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let result = json as? JSON else { throw ParsingError.invalidInput }
return result
}```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 {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let result = json as? JSON else { throw ParsingError.invalidInput }
return result
}
// Example of usage
do {
let json = try parse(string: "{\"a\": 1}")
print(json)
} catch ParsingError.invalidInput {
print("Invalid input")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
}
``` // XCTAssertTrue failedtypealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let jsonObject = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonObject
}```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 {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let jsonObject = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonObject
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let jsonObject = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonObject
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let jsonObject = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonObject
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let jsonObject = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonObject
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let jsonObject = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonObject
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let jsonObject = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonObject
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let jsonObject = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonObject
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let jsonObject = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonObject
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let jsonObject = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonObject
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let jsonObject = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonObject
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
let data = Data(string.utf8)
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let jsonObject = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonObject
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON { // XCTAssertTrue failedindirect 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.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(name)>"
}
}
func parse(_ html: String) -> HTMLNode {
let html = html.trimmingCharacters(.whitespacesAndNewlines)
if html.starts(with: "<") {
let end = html.firstIndex(of: ">")!
let name = html[..<end]
let children = html[end...]
return .element(String(name), children: children.map { parse($0) })
} else {
return .text(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 .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(name)>"
}
}
// HTML parser from string to predefined elements tree.
// Input with standart HTML like this "<div><a href="swifteval"></a></div>"
func parse(_ html: String) -> HTMLNode {
let html = html.trimmingCharacters(.whitespacesAndNewlines)
if html.starts(with: "<") {
let end = html.firstIndex(of: ">")!
let name = html[..<end]
let children = html[end...]
return .element(String(name), children: children.map { parse($0) })
} else {
return .text(html)
}
}
let tree = .element("div", children: [
.element("a", attributes: ["href": "swifteval"])
])
let html = generate(tree)
print(html)
let parsed = parse(html)
print(parsed)
```let html = html.trimmingCharacters(.whitespacesAndNewlines) // missing argument label 'in:' in callindirect 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.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(name)>"
}
}
func parse(_ string: String) -> HTMLNode {
let string = string.trimmingCharacters(in: .whitespacesAndNewlines)
if string.starts(with: "<") {
let endOfTag = string.range(of: ">")!.lowerBound
let tag = string[..<endOfTag]
let tagName = tag.dropFirst().dropLast().split(separator: " ").first!
let attributes = tag.dropFirst().dropLast().split(separator: " ").dropFirst()
let attributesDictionary = attributes.reduce([String: String]()) { result, attribute in
let key = attribute.split(separator: "=").first!
let value = attribute.dropFirst(key.count + 1).dropLast()
return result.merging([String(key): String(value)]) { _, new in new }
}
let children = string.dropFirst(endOfTag.distance(to: string.startIndex) + 1)
.dropLast(tagName.count + 3)
.split(separator: "</\(tagName)>")
.dropLast()
.map { parse(String($0)) }
return .element(String(tagName), attributes: attributesDictionary, children: children)
} else {
return .text(string)
}
}```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.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(name)>"
}
}
// HTML parser from string.
// Input with standart HTML like this "<div><a href="swifteval"></a></div>"
func parse(_ string: String) -> HTMLNode {
let string = string.trimmingCharacters(in: .whitespacesAndNewlines)
if string.starts(with: "<") {
let endOfTag = string.range(of: ">")!.lowerBound
let tag = string[..<endOfTag]
let tagName = tag.dropFirst().dropLast().split(separator: " ").first!
let attributes = tag.dropFirst().dropLast().split(separator: " ").dropFirst()
let attributesDictionary = attributes.reduce([String: String]()) { result, attribute in
let key = attribute.split(separator: "=").first!
let value = attribute.dropFirst(key.count + 1).dropLast()
return result.merging([String(key): String(value)]) { _, new in new }
}
let children = string.dropFirst(endOfTag.distance(to: string.startIndex) + 1)
.dropLast(tagName.count + 3)
.split(separator: "</\(tagName)>")
.dropLast()
.map { parse(String($0)) }
return .element(String(tagName), attributes: attributesDictionary, children: children)
} else {
return .text(string)
}
}
// Example
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"]),
.element("p", children: [
.text("Hello, "),
.element("b", children: [.text("World!")])
])
])
let html = generate(tree)
print(html)
let parsed = parse(html)
print(parsed)
```let children = string.dropFirst(endOfTag.distance(to: string.startIndex) + 1) // value of type 'String.Index' has no member 'distance'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.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(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.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(name)>"
}
}
// Example of usage
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
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 .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
return "<\(name) \(attributesString)>\(children.map(generate).joined())</\(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.key)=\"\($0.value)\"" }.joined(separator: " ")
return "<\(name) \(attributesString)>\(children.map(generate).joined())</\(name)>"
}
}
// Example of usage
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
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 .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name)\(attributesString.isEmpty ? "" : " \(attributesString)")>\(children)</\(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.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name)\(attributesString.isEmpty ? "" : " \(attributesString)")>\(children)</\(name)>"
}
}
// Example
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
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 .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(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.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(name)>"
}
}
// Example
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
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 .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(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.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(name)>"
}
}
// Example
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
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 .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(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.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(name)>"
}
}
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
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 .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(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.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(children)</\(name)>"
}
}
// Example
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
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 .text(let content):
return content
case .element(let name, let attributes, let children):
let attributes = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributes)>\(children)</\(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 attributes = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributes)>\(children)</\(name)>"
}
}
// Example
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
print(generate(tree))
```enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
// ...
}```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 {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
// ...
}
// Calculator which} // missing return in global function expected to return 'Double'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
// ...
}```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 {
// ...
}
do {
let result = try calculate("2+2*2")
print(result)
} catch CalculateError.invalidInput {
print("Invalid input")
}
```} // missing return in global function expected to return 'Double'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
// ...
}```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 {
// ...
}
do {
let result = try calculate("2+2*2")
print(result)
} catch CalculateError.invalidInput {
print("Invalid input")
}
```} // missing return in global function expected to return 'Double'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
// TODO: implement
return 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 {
// TODO: implement
return 0
}
// Test cases
let testCases: [(input: String, expected: Double)] = [
("2+2*2", 6),
("(2+2)*2", 8),
("(2+2)*2-2", 6),
("(2+2)*2-2/2", 7),
("(2+2)*2-2/2+1", 8),
("(2+2)*2-2/2+1/2", 8.5),
("(2+2)*2-2/2+1/2-1", 7.5),
("(2+2)*2-2/2+1/2-1*2", 5.5),
("(2+2)*2-2/2+1/2-1*2/2", 5.25),
("(2+2)*2-2/2+1/2-1*2/2+1", 6.25),
("(2+2)*2-2/2+1/2-1*2/2+1/2", 6.375),
("(2+2)*2-2/2+1/2-1*2/2+1/2-1", 5.375),
("(2+2)*2-2/2+1/2-1*2/2+1/2-1*2", 3.375),
("(2+2)*2-2/2+1/2-1*2/2+1/2-1*2/2", 3.1875),
("(2+2)*2-2/2+1/2-1*2/2+1/2-1*2/2+1", 4.1875),
("(2+2)*2-2/2+1/2-1*2/2+1/2-1*2/2+1/2", 4.28125),
("(2+2)*2-2/2+1/2-1*2/2+1/2-1*2/2+1/2-1", 3.28125),
("(2+2)*2-2/2+1/2-1*2/2+1/2-1*2/2+1/2-1*2", 1.28125),
("(2+2)*2-2/2+1/2-1*2/2+1/2-1*2/2+1/2-1*2/2", 1.140625),
("(2+2)*2-2/2+1/2-1*2/2+1/2-1*2/2+1/2-1*2/2+1", 2.140625),
("(2+2)*2-2/2+1/2-1*2/2+1/2-1*2/2+1/2-1*2/2+1/2", 2.2109375),
("(2+2)*2-2/2+1/2-1*2/2+1/2-1*2/2+1/2-1*2/2+1/2-1", 1.2109375),
("(2+2)*2-2/2+1/2-1*2/2+1/2-1*2/2+1/2-1*2/2+1/2-1*2", -0.2109375),
("(2+2)*2-2/2+1/2-1*2/2+1/2-1*2/2+1/2-1*2/2+1/2-1*2/2", -0.10546875), // XCTAssertEqual failed: (0.0) is not equal to (4.0)enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
// TODO: implement
throw CalculateError.invalidInput
}```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 {
// TODO: implement
throw CalculateError.invalidInput
}
// Example usage:
try calculate("2+2*2") // 6
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var stack = Stack<Double>()
var tokens = string.split(separator: " ")
var currentToken = tokens.popFirst()
while currentToken != nil {
if let number = Double(currentToken!) {
stack.push(number)
} else {
switch currentToken {
case "+":
stack.push(stack.pop()! + stack.pop()!)
case "-":
stack.push(stack.pop()! - stack.pop()!)
case "*":
stack.push(stack.pop()! * stack.pop()!)
case "/":
stack.push(stack.pop()! / stack.pop()!)
default:
throw CalculateError.invalidInput
}
}
currentToken = tokens.popFirst()
}
return stack.pop()!
}```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 stack = Stack<Double>()
var tokens = string.split(separator: " ")
var currentToken = tokens.popFirst()
while currentToken != nil {
if let number = Double(currentToken!) {
stack.push(number)
} else {
switch currentToken {
case "+":
stack.push(stack.pop()! + stack.pop()!)
case "-":
stack.push(stack.pop()! - stack.pop()!)
case "*":
stack.push(stack.pop()! * stack.pop()!)
case "/":
stack.push(stack.pop()! / stack.pop()!)
default:
throw CalculateError.invalidInput
}
}
currentToken = tokens.popFirst()
}
return stack.pop()!
}
try calculate("2 2 +")
// 4
```var stack = Stack<Double>() // cannot find 'Stack' in scopevar currentToken = tokens.popFirst() // referencing instance method 'popFirst()' on 'Collection' requires the types '[String.SubSequence]' (aka 'Array<Substring>') and 'Array<String.SubSequence>.SubSequence' (aka 'ArraySlice<Substring>') be equivalentcurrentToken = tokens.popFirst() // referencing instance method 'popFirst()' on 'Collection' requires the types '[String.SubSequence]' (aka 'Array<Substring>') and 'Array<String.SubSequence>.SubSequence' (aka 'ArraySlice<Substring>') be equivalentenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
var stack = [Double]()
var operators = [String]()
for token in tokens {
if let number = Double(String(token)) {
stack.append(number)
} else {
operators.append(String(token))
}
}
while operators.count > 0 {
let operator = operators.removeLast()
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
switch operator {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
}
return stack.removeLast()
}```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: " ")
var stack = [Double]()
var operators = [String]()
for token in tokens {
if let number = Double(String(token)) {
stack.append(number)
} else {
operators.append(String(token))
}
}
while operators.count > 0 {
let operator = operators.removeLast()
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
switch operator {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
}
return stack.removeLast()
}
let result = try calculate("2 + 2 * 2")
print(result)
```let operator = operators.removeLast() // keyword 'operator' cannot be used as an identifier hereswitch operator { // expected operator name in operator declarationswitch operator { // expected expression in 'switch' statementenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var tokens = string.split(separator: " ")
var stack = Stack<Double>()
var result = 0.0
while let token = tokens.popLast() {
switch token {
case "+":
result = stack.pop() + stack.pop()
stack.push(result)
case "-":
result = stack.pop() - stack.pop()
stack.push(result)
case "*":
result = stack.pop() * stack.pop()
stack.push(result)
case "/":
result = stack.pop() / stack.pop()
stack.push(result)
case "(":
stack.push(result)
case ")":
result = stack.pop()
default:
if let number = Double(token) {
stack.push(number)
} else {
throw CalculateError.invalidInput
}
}
}
return stack.pop()
}```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 = Stack<Double>()
var result = 0.0
while let token = tokens.popLast() {
switch token {
case "+":
result = stack.pop() + stack.pop()
stack.push(result)
case "-":
result = stack.pop() - stack.pop()
stack.push(result)
case "*":
result = stack.pop() * stack.pop()
stack.push(result)
case "/":
result = stack.pop() / stack.pop()
stack.push(result)
case "(":
stack.push(result)
case ")":
result = stack.pop()
default:
if let number = Double(token) {
stack.push(number)
} else {
throw CalculateError.invalidInput
}
}
}
return stack.pop()
}
print(try calculate("2 + 2 * 2"))
```var stack = Stack<Double>() // cannot find 'Stack' in scopeenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var tokens = string.split(separator: " ")
var stack: [Double] = []
var operators: [String] = []
for token in tokens {
if let number = Double(String(token)) {
stack.append(number)
} else {
operators.append(String(token))
}
}
var result = stack.removeFirst()
while !operators.isEmpty {
let operator = operators.removeFirst()
let number = stack.removeFirst()
switch operator {
case "+":
result += number
case "-":
result -= number
case "*":
result *= number
case "/":
result /= number
default:
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.split(separator: " ")
var stack: [Double] = []
var operators: [String] = []
for token in tokens {
if let number = Double(String(token)) {
stack.append(number)
} else {
operators.append(String(token))
}
}
var result = stack.removeFirst()
while !operators.isEmpty {
let operator = operators.removeFirst()
let number = stack.removeFirst()
switch operator {
case "+":
result += number
case "-":
result -= number
case "*":
result *= number
case "/":
result /= number
default:
throw CalculateError.invalidInput
}
}
return result
}
try calculate("2 + 2 * 2")
```let operator = operators.removeFirst() // keyword 'operator' cannot be used as an identifier hereswitch operator { // expected operator name in operator declarationswitch operator { // expected expression in 'switch' statementenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
// TODO: Implement
throw CalculateError.invalidInput
}```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 {
// TODO: Implement
throw CalculateError.invalidInput
}
// Tests
print(try calculate("2+2*2")) // 6
print(try calculate("2+2*2+2")) // 8
print(try calculate("2+2*2+2*2")) // 12
print(try calculate("2+2*2+2*2+2")) // 14
print(try calculate("2+2*2+2*2+2*2")) // 20
print(try calculate("2+2*2+2*2+2*2+2")) // 22
print(try calculate("2+2*2+2*2+2*2+2+2")) // 24
print(try calculate("2+2*2+2*2+2*2+2+2+2")) // 26
print(try calculate("2+2*2+2*2+2*2+2+2+2+2")) // 28
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2")) // 30
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2")) // 32
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2+2")) // 34
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2+2+2")) // 36
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2+2+2+2")) // 38
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2+2+2+2+2")) // 40
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2+2+2+2+2+2")) // 42
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2+2+2+2+2+2+2")) // 44
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2+2+2+2+2+2+2+2")) // 46
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2+2+2+2+2+2+2+2+2")) // 48
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2")) // 50
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2")) // 52
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2")) // 54
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2")) // 56
print(try calculate("2+2*2+2*2+2*2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2")) // 58
print(try calculate("2+2*2+2*2+2*2 // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
func execute(binary: String, arguments: [String], environment: [String: String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.environment = environment
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
func execute(binary: String, arguments: [String], environment: [String: String], timeout: TimeInterval) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.environment = environment
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit(timeout: timeout)
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
func execute(binary: String, arguments: [String], environment: [String: String], timeout: TimeInterval, error: inout Error?) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.environment = environment
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit(timeout: timeout)
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}```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 errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String], environment: [String: String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.environment = environment
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String], environment: [String: String], timeout: TimeInterval) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.environment = environment
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit(timeout: timeout)
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String], environment: [String: String], timeout: TimeInterval, error: inout Error?) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.environment = environment
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit(timeout: timeout)
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String], environment: [String: String], timeout: TimeInterval, error: inout Error?, output: (String, String) -> Void) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.environment = environment
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit(timeout: timeout)
let data = pipe.fileHandleForReadingtask.waitUntilExit(timeout: timeout) // argument passed to call that takes no argumentstask.waitUntilExit(timeout: timeout) // argument passed to call that takes no argumentsfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
func execute(binary: String, arguments: [String]) -> String {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
return String(data: data, encoding: .utf8) ?? ""
}
func execute(binary: String, arguments: [String]) -> String {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return String(data: errData, encoding: .utf8) ?? ""
}
func execute(binary: String, arguments: [String]) -> Int32 {
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.launch()
task.waitUntilExit()
return task.terminationStatus
}
func execute(binary: String, arguments: [String]) -> (Int32, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: data, encoding: .utf8) ?? "")
}
func execute(binary: String, arguments: [String]) -> (Int32, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: errData, encoding: .utf8) ?? "")
}```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 errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments and return stdout.
func execute(binary: String, arguments: [String]) -> String {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
return String(data: data, encoding: .utf8) ?? ""
}
// Function to execute binary with arguments and return stderr.
func execute(binary: String, arguments: [String]) -> String {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return String(data: errData, encoding: .utf8) ?? ""
}
// Function to execute binary with arguments and return exit code.
func execute(binary: String, arguments: [String]) -> Int32 {
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.launch()
task.waitUntilExit()
return task.terminationStatus
}
// Function to execute binary with arguments and return exit code and stdout.
func execute(binary: String, arguments: [String]) -> (Int32, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: data, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments and return exit code and stderr.
func execute(binary: String, arguments: [String]) -> (Int32, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: errData, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments and return exit code and stdout and stderr.
func execute(binary: String, arguments: [String]) -> (Int32, String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
func execute(binary: String, arguments: [String]) -> String { // invalid redeclaration of 'execute(binary:arguments:)'func execute(binary: String, arguments: [String]) -> (Int32, String) { // invalid redeclaration of 'execute(binary:arguments:)'var (stdout, stderr) = execute(binary: "/bin/zsh", arguments: ["-c", "echo Hello!"]) // ambiguous use of 'execute(binary:arguments:)'XCTAssertEqual(stdout.trimmingCharacters(in: .whitespacesAndNewlines), "Hello!") // cannot infer contextual base in reference to member 'whitespacesAndNewlines'XCTAssertEqual(stderr.trimmingCharacters(in: .whitespacesAndNewlines), "") // cannot infer contextual base in reference to member 'whitespacesAndNewlines'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
func execute(binary: String, arguments: [String], timeout: TimeInterval) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit(timeout: timeout)
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
func execute(binary: String, arguments: [String], timeout: TimeInterval, error: inout String) -> String {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit(timeout: timeout)
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
error = String(data: errData, encoding: .utf8) ?? ""
return String(data: data, encoding: .utf8) ?? ""
}
func execute(binary: String, arguments: [String], timeout: TimeInterval, error: inout String, output: inout String) -> Bool {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit(timeout: timeout)
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
error = String(data: errData, encoding: .utf8) ?? ""
output = String(data: data, encoding: .utf8) ?? ""
return task.terminationStatus == 0
}```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 errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String], timeout: TimeInterval) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit(timeout: timeout)
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String], timeout: TimeInterval, error: inout String) -> String {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit(timeout: timeout)
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
error = String(data: errData, encoding: .utf8) ?? ""
return String(data: data, encoding: .utf8) ?? ""
}
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String], timeout: TimeInterval, error: inout String, output: inout String) -> Bool {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit(timeout: timeout)
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
error = String(data: errData, encoding: .utf8) ?? ""
output = String(data: data, encoding: .utf8) ?? ""
return task.terminationStatus == 0
}
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String], timeout: TimeInterval, error: inout String, output: inout String, exitCode: inout Int32) -> Bool {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit(timeout: timeout)
let data = pipe.fileHandleForReading.readDataToEndOfFile()
lettask.waitUntilExit(timeout: timeout) // argument passed to call that takes no argumentstask.waitUntilExit(timeout: timeout) // argument passed to call that takes no argumentstask.waitUntilExit(timeout: timeout) // argument passed to call that takes no argumentsfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
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 = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit() // XCTAssertEqual failed: () is not equal to (Hello!)func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
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]) -> Int32 {
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.launch()
task.waitUntilExit()
return task.terminationStatus
}
func execute(binary: String, arguments: [String]) -> (Int32, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: data, encoding: .utf8) ?? "")
}
func execute(binary: String, arguments: [String]) -> (Int32, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: errData, encoding: .utf8) ?? "")
}
func execute(binary: String, arguments: [String]) -> (Int32, String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}```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 errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// 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 exit code.
func execute(binary: String, arguments: [String]) -> Int32 {
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.launch()
task.waitUntilExit()
return task.terminationStatus
}
// Function to execute binary with arguments and return exit code and stdout.
func execute(binary: String, arguments: [String]) -> (Int32, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: data, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments and return exit code and stderr.
func execute(binary: String, arguments: [String]) -> (Int32, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: errData, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments and return exit code and stdout and stderr.
func execute(binary: String, arguments: [String]) -> (Int32, String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments and return exit code and stdout and stderr and return code.
func execute(binary: String, arguments: [String]) -> (Int32, String, String, Int32) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
func execute(binary: String, arguments: [String]) -> String { // invalid redeclaration of 'execute(binary:arguments:)'return execute(binary: binary, arguments: arguments).1 // ambiguous use of 'execute(binary:arguments:)'func execute(binary: String, arguments: [String]) -> (Int32, String) { // invalid redeclaration of 'execute(binary:arguments:)'var (stdout, stderr) = execute(binary: "/bin/zsh", arguments: ["-c", "echo Hello!"]) // ambiguous use of 'execute(binary:arguments:)'XCTAssertEqual(stdout.trimmingCharacters(in: .whitespacesAndNewlines), "Hello!") // cannot infer contextual base in reference to member 'whitespacesAndNewlines'XCTAssertEqual(stderr.trimmingCharacters(in: .whitespacesAndNewlines), "") // cannot infer contextual base in reference to member 'whitespacesAndNewlines'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}```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 = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
// XCTAssertEqual failed: () is not equal to (Hello!)func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
func executeWithRedirectedStderr(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " ")) 2>&1"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
func executeWithRedirectedStderrAndStdout(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " ")) > /dev/null 2>&1"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
func executeWithRedirectedStderrAndStdoutAndWaitForExit(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " ")) > /dev/null 2>&1"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
func executeWithRedirectedStderrAndStdoutAndWaitForExitAndReturnExitCode(binary: String, arguments: [String]) -> (String, String, Int32) {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " ")) > /dev/null 2>&1"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "", 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()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " "))"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// Function to execute binary with arguments and redirect stderr to stdout.
// Returns tuple where first element is stdout and second is stderr.
func executeWithRedirectedStderr(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " ")) 2>&1"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// Function to execute binary with arguments and redirect stderr to stdout and stdout to /dev/null.
// Returns tuple where first element is stdout and second is stderr.
func executeWithRedirectedStderrAndStdout(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " ")) > /dev/null 2>&1"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// Function to execute binary with arguments and redirect stderr to stdout and stdout to /dev/null and wait for exit.
// Returns tuple where first element is stdout and second is stderr.
func executeWithRedirectedStderrAndStdoutAndWaitForExit(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " ")) > /dev/null 2>&1"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// Function to execute binary with arguments and redirect stderr to stdout and stdout to /dev/null and wait for exit and return exit code.
// Returns tuple where first element is stdout and second is stderr.
func executeWithRedirectedStderrAndStdoutAndWaitForExitAndReturnExitCode(binary: String, arguments: [String]) -> (String, String, Int32) {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\(binary) \(arguments.joined(separator: " ")) > /dev/null 2>&1"]
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "", task.terminationStatus)
}
// Function to execute binary with arguments and redirect stderr to stdout // XCTAssertEqual failed: () is not equal to (Hello!)func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = [binary] + arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
func executeStdout(binary: String, arguments: [String]) -> String {
let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = [binary] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
return String(data: data, encoding: .utf8) ?? ""
}
func executeStderr(binary: String, arguments: [String]) -> String {
let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = [binary] + arguments
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return String(data: errData, encoding: .utf8) ?? ""
}
func executeExitCode(binary: String, arguments: [String]) -> Int32 {
let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = [binary] + arguments
task.launch()
task.waitUntilExit()
return task.terminationStatus
}
func executeExitCodeAndStdout(binary: String, arguments: [String]) -> (Int32, String) {
let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = [binary] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: data, encoding: .utf8) ?? "")
}
func executeExitCodeAndStderr(binary: String, arguments: [String]) -> (Int32, String) {
let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = [binary] + arguments
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: errData, encoding: .utf8) ?? "")
}```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 = "/usr/bin/env"
task.arguments = [binary] + arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding: .utf8) ?? "", String(data: errData, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments and return stdout.
func executeStdout(binary: String, arguments: [String]) -> String {
let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = [binary] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
return String(data: data, encoding: .utf8) ?? ""
}
// Function to execute binary with arguments and return stderr.
func executeStderr(binary: String, arguments: [String]) -> String {
let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = [binary] + arguments
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return String(data: errData, encoding: .utf8) ?? ""
}
// Function to execute binary with arguments and return exit code.
func executeExitCode(binary: String, arguments: [String]) -> Int32 {
let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = [binary] + arguments
task.launch()
task.waitUntilExit()
return task.terminationStatus
}
// Function to execute binary with arguments and return exit code and stdout.
func executeExitCodeAndStdout(binary: String, arguments: [String]) -> (Int32, String) {
let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = [binary] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: data, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments and return exit code and stderr.
func executeExitCodeAndStderr(binary: String, arguments: [String]) -> (Int32, String) {
let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = [binary] + arguments
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let errData = errPipe.fileHandleForReading.readDataToEndOfFile()
return (task.terminationStatus, String(data: errData, encoding: .utf8) ?? "")
}
// Function to execute binary with arguments and return exit code and stdout and stderr.
func executeExitCodeAndStdoutAndStderr(binary: String, arguments: [String]) -> (Int32, String, String) {
let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = [binary] + arguments
let pipe = Pipe()
task.standardOutput = pipe
let errPipe = Pipe()
task.standardError = errPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
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 = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, "")
}
// 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) {
letfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
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 = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return (output, "")
}
// 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 = "/bin/bash"
task.arguments = ["-c", "\"\(binary)\""] + arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return (output, "")
}
// 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 = "/func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { argument in
if let result = cache[argument] {
return result
} else {
let result = function(argument)
cache[argument] = 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 { argument in
if let result = cache[argument] {
return result
} else {
let result = function(argument)
cache[argument] = result
return result
}
}
}
// Example usage
let fibonacci = memoize { n in
if n == 0 || n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 89
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { argument in
if let result = cache[argument] {
return result
} else {
let result = function(argument)
cache[argument] = 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 { argument in
if let result = cache[argument] {
return result
} else {
let result = function(argument)
cache[argument] = result
return result
}
}
}
// Example usage:
let fibonacci = memoize { n in
if n <= 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 55
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { arg in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = 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 { arg in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
// Example usage
let fibonacci = memoize { n in
if n <= 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 55
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { arg in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = 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 { arg in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
// Example usage
let fibonacci = memoize { n in
if n <= 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 55
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { argument in
if let result = cache[argument] {
return result
} else {
let result = function(argument)
cache[argument] = 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 { argument in
if let result = cache[argument] {
return result
} else {
let result = function(argument)
cache[argument] = result
return result
}
}
}
// Example usage
let fibonacci = memoize { n in
if n == 0 || n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 89
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { arg in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = 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 { arg in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
// Example usage:
let fibonacci = memoize { n in
if n == 0 || n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 89
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { arg in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = 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 { arg in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
// Example usage
let fibonacci = memoize { n in
if n == 0 || n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 89
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { argument in
if let result = cache[argument] {
return result
} else {
let result = function(argument)
cache[argument] = 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 { argument in
if let result = cache[argument] {
return result
} else {
let result = function(argument)
cache[argument] = result
return result
}
}
}
// Example usage:
let fibonacci = memoize { n in
if n <= 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 55
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { arg in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = 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 { arg in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
// Example usage:
let fibonacci = memoize { n in
if n == 0 || n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 89
print(fibonacci(20)) // Output: 10946
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { arg in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = 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 { arg in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
// Example usage
let fibonacci = memoize { n in
if n == 0 || n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 89
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Error: \(error)")
}
}
throw RetryError.exhausted
}```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 {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Error: \(error)")
}
}
throw RetryError.exhausted
}
// Example usage
do {
let result = try retry(attempts: 3) {
// Perform some task that may fail
throw RetryError.networkError
}
print("Result: \(result)")
} catch {
print("Error: \(error)")
}
```throw RetryError.exhausted // cannot find 'RetryError' in scopefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Retrying task: \(error)")
}
}
throw RetryError.exhausted
}```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 {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Retrying task: \(error)")
}
}
throw RetryError.exhausted
}
// Example usage
do {
let result = try retry(attempts: 3) {
// Perform some task that may fail
throw RetryError.networkError
}
print("Task succeeded: \(result)")
} catch RetryError.exhausted {
print("Retry attempts exhausted")
} catch {
print("Task failed: \(error)")
}
```throw RetryError.exhausted // cannot find 'RetryError' in scopefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Error: \(error)")
}
}
throw RetryError.exhausted
}```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 {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Error: \(error)")
}
}
throw RetryError.exhausted
}
// Example usage
do {
let result = try retry(attempts: 3) {
// Task that may fail
throw RetryError.networkError
}
print("Result: \(result)")
} catch RetryError.exhausted {
print("Retry exhausted")
} catch RetryError.networkError {
print("Network error")
}
```throw RetryError.exhausted // cannot find 'RetryError' in scopefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var remainingAttempts = attempts
while remainingAttempts > 0 {
do {
return try task()
} catch {
remainingAttempts -= 1
if remainingAttempts == 0 {
throw error
}
}
}
fatalError("Unreachable")
}```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 remainingAttempts = attempts
while remainingAttempts > 0 {
do {
return try task()
} catch {
remainingAttempts -= 1
if remainingAttempts == 0 {
throw error
}
}
}
fatalError("Unreachable")
}
// Example usage
do {
let result = try retry(attempts: 3) {
// Perform some task that may fail
throw NSError(domain: "MyDomain", code: 42, userInfo: nil)
}
print("Task succeeded: \(result)")
} catch {
print("Task failed: \(error)")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Retrying task...")
}
}
throw NSError(domain: "RetryError", 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 {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Retrying task...")
}
}
throw NSError(domain: "RetryError", code: 1, userInfo: nil)
}
// Example usage
do {
let result = try retry(attempts: 3) {
// Perform some task that may fail
throw NSError(domain: "TaskError", code: 2, userInfo: nil)
}
print("Task succeeded with result: \(result)")
} catch {
print("Task failed with error: \(error)")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var remainingAttempts = attempts
while true {
do {
return try task()
} catch {
if remainingAttempts == 0 {
throw error
}
remainingAttempts -= 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 remainingAttempts = attempts
while true {
do {
return try task()
} catch {
if remainingAttempts == 0 {
throw error
}
remainingAttempts -= 1
}
}
}
// Example usage:
do {
let result = try retry(attempts: 3) {
// Perform some task that may fail
throw NSError(domain: "MyDomain", code: 1, userInfo: nil)
}
print("Task succeeded with result: \(result)")
} catch {
print("Task failed with error: \(error)")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Error: \(error)")
}
}
throw RetryError.exhaustedAttempts
}```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 {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Error: \(error)")
}
}
throw RetryError.exhaustedAttempts
}
// Example usage
do {
let result = try retry(attempts: 3) {
// Task to be retried
let url = URL(string: "https://www.example.com")!
let (data, _) = try await URLSession.shared.data(from: url)
return String(data: data, encoding: .utf8) ?? ""
}
print("Result: \(result)")
} catch {
print("Error: \(error)")
}
```throw RetryError.exhaustedAttempts // cannot find 'RetryError' in scopefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Retrying...")
}
}
throw NSError(domain: "com.example.app", 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 {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Retrying...")
}
}
throw NSError(domain: "com.example.app", code: 1, userInfo: nil)
}
// Example usage
do {
let result = try retry(attempts: 3) {
// Perform some task that may fail
throw NSError(domain: "com.example.app", code: 1, userInfo: nil)
}
print("Task succeeded: \(result)")
} catch {
print("Task failed: \(error)")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Retrying task...")
}
}
throw RetryError.exhaustedAttempts
}```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 {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Retrying task...")
}
}
throw RetryError.exhaustedAttempts
}
// Example usage
do {
let result = try retry(attempts: 3) {
// Perform some task that may fail
throw RetryError.networkError
}
print("Task succeeded with result: \(result)")
} catch RetryError.networkError {
print("Task failed due to network error")
} catch RetryError.exhaustedAttempts {
print("Task failed after exhausting all attempts")
} catch {
print("Task failed with error: \(error)")
}
```throw RetryError.exhaustedAttempts // cannot find 'RetryError' in scopefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Retrying task...")
}
}
throw NSError(domain: "RetryError", 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 {
for _ in 0..<attempts {
do {
return try task()
} catch {
print("Retrying task...")
}
}
throw NSError(domain: "RetryError", code: 1, userInfo: nil)
}
// Example usage
do {
let result = try retry(attempts: 3) {
// Task that may fail
throw NSError(domain: "TaskError", code: 1, userInfo: nil)
}
print("Task succeeded with result: \(result)")
} catch {
print("Task failed with 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? {
guard let factory = factories[type] 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]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[type] as? () -> T else {
return nil
}
return factory()
}
}
// Example usage
let container = DIContainer()
// Register dependencies
container.register(Foo.self) { Foo() }
container.register(Bar.self) { Bar() }
// Resolve dependencies
let foo = container.resolve(Foo.self)
let bar = container.resolve(Bar.self)
// Use dependencies
foo?.doSomething()
bar?.doSomethingElse()
```factories[type] = factory // argument type 'T.Type' does not conform to expected type 'Hashable'guard let factory = factories[type] as? () -> T else { // cannot convert value of type 'T.Type' to expected argument type 'Dictionary<AnyHashable, () -> Any>.Index'guard let factory = factories[type] 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) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[type] 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]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[type] as? () -> T else {
return nil
}
return factory()
}
}
// Example usage
let container = DIContainer()
// Register dependencies
container.register(User.self) { User(name: "John", age: 30) }
container.register(Address.self) { Address(street: "123 Main St", city: "Anytown") }
// Resolve dependencies
let user = container.resolve(User.self)
let address = container.resolve(Address.self)
// Use resolved dependencies
print(user?.name) // Output: "John"
print(address?.street) // Output: "123 Main St"
```factories[type] = factory // argument type 'T.Type' does not conform to expected type 'Hashable'guard let factory = factories[type] as? () -> T else { // cannot convert value of type 'T.Type' to expected argument type 'Dictionary<AnyHashable, () -> Any>.Index'guard let factory = factories[type] 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 = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
if let factory = factories[String(describing: type)] as? () -> T {
return factory()
}
return nil
}
}```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(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
if let factory = factories[String(describing: type)] as? () -> T {
return factory()
}
return nil
}
}
// Example usage
let container = DIContainer()
// Register dependencies
container.register(Logger.self, factory: { Logger() })
container.register(Database.self, factory: { Database() })
// Resolve dependencies
if let logger = container.resolve(Logger.self),
let database = container.resolve(Database.self) {
// Use the resolved dependencies
logger.log("Dependencies resolved successfully")
database.connect()
} else {
print("Failed to resolve dependencies")
}
```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[type.description] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
if let factory = factories[type.description] as? () -> T {
return factory()
}
return nil
}
}```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[type.description] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
if let factory = factories[type.description] as? () -> T {
return factory()
}
return nil
}
}
// Example usage
let container = DIContainer()
// Register dependencies
container.register(Logger.self) { Logger() }
container.register(Database.self) { Database() }
// Resolve dependencies
if let logger = container.resolve(Logger.self) {
logger.log("Hello, DI!")
}
if let database = container.resolve(Database.self) {
database.connect()
}
```factories[type.description] = factory // type 'T' has no member 'description'if let factory = factories[type.description] as? () -> T { // type 'T' has no member 'description'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(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: type)] 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 = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: type)] as? () -> T else { return nil }
return factory()
}
}
// Example usage
let container = DIContainer()
// Register dependencies
container.register(Logger.self) { Logger() }
container.register(Database.self) { Database() }
// Resolve dependencies
let logger = container.resolve(Logger.self)
let database = container.resolve(Database.self)
// Use dependencies
logger?.log("Hello, DI!")
database?.save(data: "Some data")
```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(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
if let factory = factories[String(describing: type)] as? () -> T {
return factory()
}
return nil
}
}```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(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
if let factory = factories[String(describing: type)] as? () -> T {
return factory()
}
return nil
}
}
// Example usage
let container = DIContainer()
// Register dependencies
container.register(Logger.self) { Logger() }
container.register(Database.self) { Database() }
// Resolve dependencies
let logger = container.resolve(Logger.self)
let database = container.resolve(Database.self)
// Use dependencies
logger?.log("Hello, DI!")
database?.query("SELECT * FROM users")
```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(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
if let factory = factories[String(describing: type)] as? () -> T {
return factory()
}
return nil
}
}```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(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
if let factory = factories[String(describing: type)] as? () -> T {
return factory()
}
return nil
}
}
// Example usage
let container = DIContainer()
// Register dependencies
container.register(Logger.self) { Logger() }
container.register(Database.self) { Database() }
// Resolve dependencies
if let logger = container.resolve(Logger.self) {
logger.log("Hello, DI!")
}
if let database = container.resolve(Database.self) {
database.query("SELECT * FROM users")
}
```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(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: type)] 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 = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: type)] as? () -> T else { return nil }
return factory()
}
}
// Example usage
let container = DIContainer()
// Register dependencies
container.register(Logger.self) { Logger() }
container.register(Database.self) { Database() }
// Resolve dependencies
let logger = container.resolve(Logger.self)
let database = container.resolve(Database.self)
// Use dependencies
logger?.log("Hello, DI!")
database?.save("data")
```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(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: type)] else {
return nil
}
return factory() as? T
}
}
class MyService {
let container: DIContainerProtocol
init(container: DIContainerProtocol) {
self.container = container
}
func doSomething() {
let myDependency = container.resolve(MyDependency.self)
// Use myDependency here
}
}
class MyDependency {
// ...
}```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(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: type)] else {
return nil
}
return factory() as? T
}
}
// Example usage
class MyService {
let container: DIContainerProtocol
init(container: DIContainerProtocol) {
self.container = container
}
func doSomething() {
let myDependency = container.resolve(MyDependency.self)
// Use myDependency here
}
}
class MyDependency {
// ...
}
let container = DIContainer()
container.register(MyDependency.self) { MyDependency() }
let myService = MyService(container: container)
myService.doSomething()
```let myDependency = container.resolve(MyDependency.self) // initialization of immutable value 'myDependency' was never used; consider replacing with assignment to '_' or removing itprotocol 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(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: 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 = [String: () -> Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: type)] else { return nil }
return factory() as? T
}
}
// Example usage
let container = DIContainer()
// Register dependencies
container.register(Logger.self) { Logger() }
container.register(Database.self) { Database() }
// Resolve dependencies
let logger = container.resolve(Logger.self)
let database = container.resolve(Database.self)
// Use dependencies
logger?.log("Hello, DI!")
database?.query("SELECT * FROM users")
```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 state: State
private var transitions: [State: [Event: State]]
init(state: State) {
self.state = state
self.transitions = [:]
}
var state: State {
get {
return state
}
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
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 {
private var state: State
private var transitions: [State: [Event: State]]
init(state: State) {
self.state = state
self.transitions = [:]
}
var state: State {
get {
return state
}
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
state = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from][event] = to
}
}
// Example usage
let machine = StateMachine<String, String>(state: "A")
machine.registerTransition(from: "A", to: "B", event: "event1")
machine.registerTransition(from: "B", to: "C", event: "event2")
machine.registerTransition(from: "C", to: "A", event: "event3")
print(machine.state) // "A"
machine.trigger(event: "event1")
print(machine.state) // "B"
machine.trigger(event: "event2")
print(machine.state) // "C"
machine.trigger(event: "event3")
print(machine.state) // "A"
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'var state: State { // invalid redeclaration of 'state'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]'transitions[from][event] = to // 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 {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
var state: State {
get {
return state
}
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
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 {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
var state: State {
get {
return state
}
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
state = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[event] = to
}
}
// Example usage
let machine = StateMachine<String, String>(state: "A")
machine.registerTransition(from: "A", to: "B", event: "event1")
machine.registerTransition(from: "B", to: "C", event: "event2")
machine.registerTransition(from: "C", to: "A", event: "event3")
machine.trigger(event: "event1") // State is now "B"
machine.trigger(event: "event2") // State is now "C"
machine.trigger(event: "event3") // State is now "A"
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'var state: State { // invalid redeclaration of 'state'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 {
var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state][event] else {
fatalError("No transition defined for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
enum TrafficLightState: Hashable {
case green
case yellow
case red
}
enum TrafficLightEvent: Hashable {
case green
case yellow
case red
}```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 {
var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state][event] else {
fatalError("No transition defined for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage
enum TrafficLightState: Hashable {
case green
case yellow
case red
}
enum TrafficLightEvent: Hashable {
case green
case yellow
case red
}
let trafficLight = StateMachine<TrafficLightState, TrafficLightEvent>(state: .green)
trafficLight.registerTransition(from: .green, to: .yellow, event: .yellow)
trafficLight.registerTransition(from: .yellow, to: .red, event: .red)
trafficLight.registerTransition(from: .red, to: .green, event: .green)
print("Current state: \(trafficLight.state)")
trafficLight.trigger(event: .yellow)
print("Current state: \(trafficLight.state)")
trafficLight.trigger(event: .red)
print("Current state: \(trafficLight.state)")
trafficLight.trigger(event: .green)
print("Current state: \(trafficLight.state)")
```guard let nextState = transitions[state][event] else { // 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 = (from: State, to: State, event: Event)
var state: State
private var transitions: [Transition] = []
init(state: State) {
self.state = state
}
func trigger(event: Event) {
let transition = transitions.first { $0.event == event && $0.from == state }
if let transition = transition {
state = transition.to
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append((from: from, to: to, event: event))
}
}
enum TrafficLightState: Hashable {
case green
case yellow
case red
}
enum TrafficLightEvent: Hashable {
case green
case yellow
case red
}```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 = (from: State, to: State, event: Event)
var state: State
private var transitions: [Transition] = []
init(state: State) {
self.state = state
}
func trigger(event: Event) {
let transition = transitions.first { $0.event == event && $0.from == state }
if let transition = transition {
state = transition.to
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append((from: from, to: to, event: event))
}
}
// Example usage
enum TrafficLightState: Hashable {
case green
case yellow
case red
}
enum TrafficLightEvent: Hashable {
case green
case yellow
case red
}
let trafficLight = StateMachine<TrafficLightState, TrafficLightEvent>(state: .green)
trafficLight.registerTransition(from: .green, to: .yellow, event: .yellow)
trafficLight.registerTransition(from: .yellow, to: .red, event: .red)
trafficLight.registerTransition(from: .red, to: .green, event: .green)
trafficLight.trigger(event: .yellow) // Traffic light changes to yellow
trafficLight.trigger(event: .red) // Traffic light changes to red
trafficLight.trigger(event: .green) // Traffic light changes to green
```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 state: State
private var transitions: [State: [Event: State]]
init(state: State) {
self.state = state
self.transitions = [:]
}
var state: State {
get {
return state
}
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
state = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from][event] = to
}
}
enum TrafficLightState: Hashable {
case green
case yellow
case red
}
enum TrafficLightEvent: Hashable {
case green
case yellow
case red
}```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 state: State
private var transitions: [State: [Event: State]]
init(state: State) {
self.state = state
self.transitions = [:]
}
var state: State {
get {
return state
}
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
state = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from][event] = to
}
}
// Example usage
enum TrafficLightState: Hashable {
case green
case yellow
case red
}
enum TrafficLightEvent: Hashable {
case green
case yellow
case red
}
let trafficLight = StateMachine<TrafficLightState, TrafficLightEvent>(state: .green)
trafficLight.registerTransition(from: .green, to: .yellow, event: .yellow)
trafficLight.registerTransition(from: .yellow, to: .red, event: .red)
trafficLight.registerTransition(from: .red, to: .green, event: .green)
trafficLight.trigger(event: .yellow)
print(trafficLight.state) // Output: .yellow
trafficLight.trigger(event: .red)
print(trafficLight.state) // Output: .red
trafficLight.trigger(event: .green)
print(trafficLight.state) // Output: .green
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'var state: State { // invalid redeclaration of 'state'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]'transitions[from][event] = to // 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 {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
var state: State {
get {
return state
}
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
state = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]].updateValue(to, forKey: event)
}
}
enum State {
case idle
case running
case finished
}
enum Event {
case start
case stop
case finish
}```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 state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
var state: State {
get {
return state
}
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
state = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]].updateValue(to, forKey: event)
}
}
// Example usage
enum State {
case idle
case running
case finished
}
enum Event {
case start
case stop
case finish
}
let stateMachine = StateMachine(state: .idle)
stateMachine.registerTransition(from: .idle, to: .running, event: .start)
stateMachine.registerTransition(from: .running, to: .finished, event: .finish)
print(stateMachine.state) // Output: .idle
stateMachine.trigger(event: .start)
print(stateMachine.state) // Output: .running
stateMachine.trigger(event: .finish)
print(stateMachine.state) // Output: .finished
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'var state: State { // invalid redeclaration of 'state'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 {
private var state: State
private var transitions: [State: [Event: State]]
init(state: State) {
self.state = state
self.transitions = [:]
}
var state: State {
get {
return self.state
}
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
self.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 {
private var state: State
private var transitions: [State: [Event: State]]
init(state: State) {
self.state = state
self.transitions = [:]
}
var state: State {
get {
return self.state
}
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
self.state = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from][event] = to
}
}
// Example usage
let machine = StateMachine<String, String>(state: "A")
machine.registerTransition(from: "A", to: "B", event: "event1")
machine.registerTransition(from: "B", to: "C", event: "event2")
machine.registerTransition(from: "C", to: "A", event: "event3")
print(machine.state) // "A"
machine.trigger(event: "event1")
print(machine.state) // "B"
machine.trigger(event: "event2")
print(machine.state) // "C"
machine.trigger(event: "event3")
print(machine.state) // "A"
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'var state: State { // invalid redeclaration of 'state'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]'transitions[from][event] = to // 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 {
private var state: State
private var transitions: [State: [Event: State]]
init(state: State) {
self.state = state
self.transitions = [:]
}
var state: State {
return self.state
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
state = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[event] = to
}
}
enum TrafficLightState: Hashable {
case green
case yellow
case red
}
enum TrafficLightEvent: Hashable {
case green
case yellow
case red
}```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 state: State
private var transitions: [State: [Event: State]]
init(state: State) {
self.state = state
self.transitions = [:]
}
var state: State {
return self.state
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
state = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[event] = to
}
}
// Example usage
enum TrafficLightState: Hashable {
case green
case yellow
case red
}
enum TrafficLightEvent: Hashable {
case green
case yellow
case red
}
let trafficLight = StateMachine<TrafficLightState, TrafficLightEvent>(state: .green)
trafficLight.registerTransition(from: .green, to: .yellow, event: .yellow)
trafficLight.registerTransition(from: .yellow, to: .red, event: .red)
trafficLight.registerTransition(from: .red, to: .green, event: .green)
trafficLight.trigger(event: .yellow) // Traffic light changes to yellow
trafficLight.trigger(event: .red) // Traffic light changes to red
trafficLight.trigger(event: .green) // Traffic light changes to green
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'var state: State { // invalid redeclaration of 'state'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 {
private var state: State
private var transitions: [State: [Event: State]]
init(state: State) {
self.state = state
self.transitions = [:]
}
var state: State {
return self.state
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
state = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from][event] = to
}
}
enum TrafficLightState: Hashable {
case green
case yellow
case red
}
enum TrafficLightEvent: Hashable {
case green
case yellow
case red
}```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 state: State
private var transitions: [State: [Event: State]]
init(state: State) {
self.state = state
self.transitions = [:]
}
var state: State {
return self.state
}
func trigger(event: Event) {
if let nextState = transitions[state][event] {
state = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from][event] = to
}
}
// Example usage
enum TrafficLightState: Hashable {
case green
case yellow
case red
}
enum TrafficLightEvent: Hashable {
case green
case yellow
case red
}
let trafficLight = StateMachine<TrafficLightState, TrafficLightEvent>(state: .green)
trafficLight.registerTransition(from: .green, to: .yellow, event: .yellow)
trafficLight.registerTransition(from: .yellow, to: .red, event: .red)
trafficLight.registerTransition(from: .red, to: .green, event: .green)
trafficLight.trigger(event: .yellow)
print(trafficLight.state) // Output: .yellow
trafficLight.trigger(event: .red)
print(trafficLight.state) // Output: .red
trafficLight.trigger(event: .green)
print(trafficLight.state) // Output: .green
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'var state: State { // invalid redeclaration of 'state'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]'transitions[from][event] = to // 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 = (from: State, to: State, event: Event)
private var state: State
private var transitions: [Transition] = []
init(state: State) {
self.state = state
}
var state: State {
get {
return state
}
}
func trigger(event: Event) {
let transition = transitions.first { $0.event == event && $0.from == state }
if let transition = transition {
state = transition.to
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append((from: from, to: to, event: event))
}
}
enum TrafficLightState: Hashable {
case green
case yellow
case red
}
enum TrafficLightEvent: Hashable {
case green
case yellow
case red
}```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 = (from: State, to: State, event: Event)
private var state: State
private var transitions: [Transition] = []
init(state: State) {
self.state = state
}
var state: State {
get {
return state
}
}
func trigger(event: Event) {
let transition = transitions.first { $0.event == event && $0.from == state }
if let transition = transition {
state = transition.to
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append((from: from, to: to, event: event))
}
}
// Example usage
enum TrafficLightState: Hashable {
case green
case yellow
case red
}
enum TrafficLightEvent: Hashable {
case green
case yellow
case red
}
let trafficLight = StateMachine<TrafficLightState, TrafficLightEvent>(state: .green)
trafficLight.registerTransition(from: .green, to: .yellow, event: .yellow)
trafficLight.registerTransition(from: .yellow, to: .red, event: .red)
trafficLight.registerTransition(from: .red, to: .green, event: .green)
print(trafficLight.state) // Output: green
trafficLight.trigger(event: .yellow)
print(trafficLight.state) // Output: yellow
trafficLight.trigger(event: .red)
print(trafficLight.state) // Output: red
trafficLight.trigger(event: .green)
print(trafficLight.state) // Output: green
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'var state: State { // invalid redeclaration of 'state'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 size): return size
case .directory(let contents): return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file: return 1
case .directory(let contents): return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file: return 1
case .directory(let contents): return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.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(let size): return size
case .directory(let contents): return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file: return 1
case .directory(let contents): return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file: return 1
case .directory(let contents): return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth })
}
}
}
// File system parser.
// Parses file system from input string.
// Supports only two commands: `cd` and `ls`.
// Supports only two file system nodes: files and directories.
// Supports only two file system node types: files and directories.
// Supports only two file system node sizes: 0 and 1.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `..`.
// Supports only two file system node names: `.` and `.case .file(let size): return size // cannot convert return expression of type '(name: String, size: Int)' to return type 'Int'case .file(let size): return size // enum case 'file' has 2 associated values; matching them as a tuple is deprecatedcase .directory(let contents): return contents.reduce(0, { $0 + $1.totalSize }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): return contents.reduce(0, { $0 + $1.totalSize }) // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedcase .directory(let contents): return contents.reduce(0, { $0 + $1.filesCount }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): return contents.reduce(0, { $0 + $1.filesCount }) // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedcase .directory(let contents): return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth }) // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedindirect 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 size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.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(let size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth })
}
}
}
// File system parser.
// Parses file system from input string.
// Input string is expected to be in the following format:
//
// $ cd /
// $ ls
// dir a
// 14848514 b.txt
// 8504156 c.dat
// dir d
// $ cd a
// $ ls
// dir e
// 29116 f
// 2557 g
// 62596 h.lst
// $ cd e
// $ ls
// 584 i
// $ cd ..
// $ cd ..
// $ cd d
// $ ls
// 4060174 j
// 8033020 d.log
// 5626152 d.ext
// 7214296 k
//
// Parses input string into a tree of FileSystemNode.
// Tree is built using the following rules:
// - Each line starting with `$ cd` is a directory.
// - Each line starting with `$ ls` is a list of files and directories.
// - Each line starting with `dir` is a directory.
// - Each line starting with a number is a file.
// - Each line starting with `$` is a command.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` is a file or directory.
// - Each line not starting with `$` iscase .file(let size): // enum case 'file' has 2 associated values; matching them as a tuple is deprecatedreturn size // cannot convert return expression of type '(name: String, size: Int)' to return type 'Int'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.totalSize }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.filesCount }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn 1 + contents.reduce(0, { $0 > $1.treeDepth ? $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 .file(let size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(let contents):
return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.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(let size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(let contents):
return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth })
}
}
}
// File system manager that can be used to build a file system tree from a list of commands.
// Commands are expected to be in the following format:
// - `$ cd <dir>` - change directory to the specified directory
// - `$ ls` - list files in the current directory
// - `<size> <name>` - file with the specified size and name
// - `dir <name>` - directory with the specified name
// - `$ <command>` - command to execute
// - `<output>` - output of the command
// - `<empty line>` - empty line
// - `<line>` - any other line
//
// Example:
// ```case .file(let size): // enum case 'file' has 2 associated values; matching them as a tuple is deprecatedreturn size // cannot convert return expression of type '(name: String, size: Int)' to return type 'Int'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.totalSize }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.filesCount }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn 1 + contents.reduce(0, { $0 > $1.treeDepth ? $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 .file(let size): return size
case .directory(let contents): return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file: return 1
case .directory(let contents): return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file: return 0
case .directory(let contents): return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth })
}
}
}
extension FileSystemNode {
static func build(from input: String) -> FileSystemNode {
let lines = input.split(separator: "\n")
var currentPath: [String] = []
var currentNode: FileSystemNode = .directory(name: "/", contents: [])
var rootNode: FileSystemNode = currentNode
for line in lines {
let lineParts = line.split(separator: " ")
switch lineParts[0] {
case "$":
if lineParts[1] == "cd" {
if lineParts[2] == ".." {
currentPath.removeLast()
currentNode = rootNode
for path in currentPath {
if case .directory(let contents) = currentNode {
for node in contents {
if case .directory(let name) = node, name == path {
currentNode = node
break
}
}
}
}
} else {
currentPath.append(lineParts[2])
if case .directory(let contents) = currentNode {
for node in contents {
if case .directory(let name) = node, name == lineParts[2] {
currentNode = node
break
}
}
}
}
}
case "dir":
if case .directory(let contents) = currentNode {
contents.append(.directory(name: String(lineParts[1]), contents: []))
}
default:
if case .directory(let contents) = currentNode {
contents.append(.file(name: String(lineParts[1]), size: Int(lineParts[0])!))
}
}
}
return rootNode
}
}
extension FileSystemNode {
func calculateSize(for directory: FileSystemNode) -> Int {
switch directory {
case .file: return 0
case .directory(let contents): return contents.reduce(0, { $0 + calculateSize(for: $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 size): return size
case .directory(let contents): return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file: return 1
case .directory(let contents): return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file: return 0
case .directory(let contents): return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth })
}
}
}
// File system builder.
// Used to build file system from input data.
extension FileSystemNode {
static func build(from input: String) -> FileSystemNode {
let lines = input.split(separator: "\n")
var currentPath: [String] = []
var currentNode: FileSystemNode = .directory(name: "/", contents: [])
var rootNode: FileSystemNode = currentNode
for line in lines {
let lineParts = line.split(separator: " ")
switch lineParts[0] {
case "$":
if lineParts[1] == "cd" {
if lineParts[2] == ".." {
currentPath.removeLast()
currentNode = rootNode
for path in currentPath {
if case .directory(let contents) = currentNode {
for node in contents {
if case .directory(let name) = node, name == path {
currentNode = node
break
}
}
}
}
} else {
currentPath.append(lineParts[2])
if case .directory(let contents) = currentNode {
for node in contents {
if case .directory(let name) = node, name == lineParts[2] {
currentNode = node
break
}
}
}
}
}
case "dir":
if case .directory(let contents) = currentNode {
contents.append(.directory(name: String(lineParts[1]), contents: []))
}
default:
if case .directory(let contents) = currentNode {
contents.append(.file(name: String(lineParts[1]), size: Int(lineParts[0])!))
}
}
}
return rootNode
}
}
// File system size calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculateSize(for directory: FileSystemNode) -> Int {
switch directory {
case .file: return 0
case .directory(let contents): return contents.reduce(0, { $0 + calculateSize(for: $1) })
}
}
}
// File system size calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculateSize(for directory: FileSystemNode) -> Int {
switch directory {
case .file: return 0
case .directory(let contents): return contents.reduce(0, { $0 + calculateSize(for: $1) })
}
}
}
// File system size calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculateSize(for directory: FileSystemNode) -> Int {
switch directory {
case .file: return 0
case .directory(let contents): return contents.reduce(0, { $0 + calculateSize(for: $1) })
}
}
}
// File system size calculation.
// Used to calculate total size of all files in file system, files count and file system treecase .file(let size): return size // enum case 'file' has 2 associated values; matching them as a tuple is deprecatedcase .file(let size): return size // cannot convert return expression of type '(name: String, size: Int)' to return type 'Int'case .directory(let contents): return contents.reduce(0, { $0 + $1.totalSize }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): return contents.reduce(0, { $0 + $1.totalSize }) // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedcase .directory(let contents): return contents.reduce(0, { $0 + $1.filesCount }) // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedcase .directory(let contents): return contents.reduce(0, { $0 + $1.filesCount }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth }) // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedif case .directory(let contents) = currentNode { // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedfor node in contents { // for-in loop requires '(name: String, contents: [FileSystemNode])' to conform to 'Sequence'currentPath.append(lineParts[2]) // cannot convert value of type 'Substring.SubSequence' (aka 'Substring') to expected argument type 'String'if case .directory(let contents) = currentNode { // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedfor node in contents { // for-in loop requires '(name: String, contents: [FileSystemNode])' to conform to 'Sequence'if case .directory(let contents) = currentNode { // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedcontents.append(.directory(name: String(lineParts[1]), contents: [])) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'append'contents.append(.directory(name: String(lineParts[1]), contents: [])) // cannot infer contextual base in reference to member 'directory'if case .directory(let contents) = currentNode { // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedcontents.append(.file(name: String(lineParts[1]), size: Int(lineParts[0])!)) // cannot infer contextual base in reference to member 'file'contents.append(.file(name: String(lineParts[1]), size: Int(lineParts[0])!)) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'append'case .directory(let contents): return contents.reduce(0, { $0 + calculateSize(for: $1) }) // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedcase .directory(let contents): return contents.reduce(0, { $0 + calculateSize(for: $1) }) // 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 .file(let size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(let contents):
return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.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(let size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(let contents):
return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth })
}
}
}
// File system parser.
// Parses file system from input string.
// Input string must be in the following format:
// - Each line is a command or file system entry.
// - Command is a string starting with "$".
// - File system entry is a string starting with "dir" or a number.
// - Directory is a string starting with "dir".
// - File is a string starting with a number.
// - File name is a string starting with a letter.
// - File size is a number.
// - Directory name is a string starting with a letter.
// - Directory path is a string starting with "/".
// - Directory path is a string containing "/".
// - Directory path is a string containing "..".
// - Directory path is a string containing ".".
// - Directory path is a string containing "//".
// - Directory path is a string containing "///".
// - Directory path is a string containing "////".
// - Directory path is a string containing "/////".
// - Directory path is a string containing "//////".
// - Directory path is a string containing "///////".
// - Directory path is a string containing "////////".
// - Directory path is a string containing "/////////".
// - Directory path is a string containing "//////////".
// - Directory path is a string containing "///////////".
// - Directory path is a string containing "////////////".
// - Directory path is a string containing "/////////////".
// - Directory path is a string containing "//////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////".
// - Directory path is a string containing "///////////////case .file(let size): // enum case 'file' has 2 associated values; matching them as a tuple is deprecatedreturn size // cannot convert return expression of type '(name: String, size: Int)' to return type 'Int'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.totalSize }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.filesCount }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn 1 + contents.reduce(0, { $0 > $1.treeDepth ? $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 .file(let size): return size
case .directory(let contents): return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file: return 1
case .directory(let contents): return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file: return 0
case .directory(let contents): return contents.reduce(0, { max($0, $1.treeDepth) }) + 1
}
}
}
extension FileSystemNode {
func totalSizeOfDirectoriesWithMaxSize(_ maxSize: Int) -> Int {
switch self {
case .file: return 0
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSizeOfDirectoriesWithMaxSize(maxSize) }) +
(totalSize <= maxSize ? totalSize : 0)
}
}
func totalSizeOfDirectoriesWithMinSize(_ minSize: Int) -> Int {
switch self {
case .file: return 0
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSizeOfDirectoriesWithMinSize(minSize) }) +
(totalSize >= minSize ? totalSize : 0)
}
}
}
extension FileSystemNode {
func smallestDirectoryToDelete(withTotalSize _: Int, andFreeSpaceRequired _: Int) -> Int {
switch self {
case .file: return Int.max
case .directory(let contents):
return contents.reduce(Int.max, { min($0, $1.smallestDirectoryToDelete(withTotalSize: 70000000, andFreeSpaceRequired: 30000000)) })
}
}
}
extension FileSystemNode {
func smallestDirectoryToDelete(withTotalSize totalSize: Int, andFreeSpaceRequired freeSpaceRequired: Int) -> Int {
switch self {
case .file: return Int.max
case .directory(let contents):
return contents.reduce(Int.max, { min($0, $1.smallestDirectoryToDelete(withTotalSize: totalSize, andFreeSpaceRequired: freeSpaceRequired)) }) +
(totalSize - freeSpaceRequired <= totalSize ? totalSize : 0)
}
}
}```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 size): return size
case .directory(let contents): return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file: return 1
case .directory(let contents): return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file: return 0
case .directory(let contents): return contents.reduce(0, { max($0, $1.treeDepth) }) + 1
}
}
}
// File system manager with additional functionality.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func totalSizeOfDirectoriesWithMaxSize(_ maxSize: Int) -> Int {
switch self {
case .file: return 0
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSizeOfDirectoriesWithMaxSize(maxSize) }) +
(totalSize <= maxSize ? totalSize : 0)
}
}
func totalSizeOfDirectoriesWithMinSize(_ minSize: Int) -> Int {
switch self {
case .file: return 0
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSizeOfDirectoriesWithMinSize(minSize) }) +
(totalSize >= minSize ? totalSize : 0)
}
}
}
// File system manager with additional functionality.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func smallestDirectoryToDelete(withTotalSize _: Int, andFreeSpaceRequired _: Int) -> Int {
switch self {
case .file: return Int.max
case .directory(let contents):
return contents.reduce(Int.max, { min($0, $1.smallestDirectoryToDelete(withTotalSize: 70000000, andFreeSpaceRequired: 30000000)) })
}
}
}
// File system manager with additional functionality.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func smallestDirectoryToDelete(withTotalSize totalSize: Int, andFreeSpaceRequired freeSpaceRequired: Int) -> Int {
switch self {
case .file: return Int.max
case .directory(let contents):
return contents.reduce(Int.max, { min($0, $1.smallestDirectoryToDelete(withTotalSize: totalSize, andFreeSpaceRequired: freeSpaceRequired)) }) +
(totalSize - freeSpaceRequired <= totalSize ? totalSize : 0)
}
}
}
// File system manager with additional functionality.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func smallestDirectoryToDelete(withTotalSize totalSize: Int, andFreeSpaceRequired freeSpaceRequired: Int) -> Int {
switch self {
case .file: return Int.max
case .directory(let contents):
return contents.reduce(Int.max, { min($0, $1.smallestDirectoryToDelete(withTotalSize: totalSize, andFreeSpaceRequired: freeSpaceRequired)) }) +
(totalSize - freeSpaceRequired <= totalSize ? totalSize : 0)
}
}
}
// File system manager with additional functionality.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func smallestDirectoryToDelete(withTotalSize totalSize: Int, andFreeSpaceRequired freeSpaceRequired: Int) -> Int {
switch self {
case .file: return Int.max
case .directory(let contents):
return contents.reduce(Int.max, { min($0, $1.smallestDirectoryToDelete(withTotalSize: totalSize, andFreeSpaceRequiredcase .file(let size): return size // cannot convert return expression of type '(name: String, size: Int)' to return type 'Int'case .file(let size): return size // enum case 'file' has 2 associated values; matching them as a tuple is deprecatedcase .directory(let contents): return contents.reduce(0, { $0 + $1.totalSize }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): return contents.reduce(0, { $0 + $1.totalSize }) // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedcase .directory(let contents): return contents.reduce(0, { $0 + $1.filesCount }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): return contents.reduce(0, { $0 + $1.filesCount }) // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedcase .directory(let contents): return contents.reduce(0, { max($0, $1.treeDepth) }) + 1 // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedcase .directory(let contents): return contents.reduce(0, { max($0, $1.treeDepth) }) + 1 // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.totalSizeOfDirectoriesWithMaxSize(maxSize) }) + // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.totalSizeOfDirectoriesWithMinSize(minSize) }) + // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(Int.max, { min($0, $1.smallestDirectoryToDelete(withTotalSize: 70000000, andFreeSpaceRequired: 30000000)) }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'func smallestDirectoryToDelete(withTotalSize totalSize: Int, andFreeSpaceRequired freeSpaceRequired: Int) -> Int { // invalid redeclaration of 'smallestDirectoryToDelete(withTotalSize:andFreeSpaceRequired:)'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(Int.max, { min($0, $1.smallestDirectoryToDelete(withTotalSize: totalSize, andFreeSpaceRequired: freeSpaceRequired)) }) + // 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 .file(let size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(let contents):
return contents.reduce(0, { max($0, $1.treeDepth) }) + 1
}
}
}
extension FileSystemNode {
static func parse(_ input: String) -> FileSystemNode {
var lines = input.split(separator: "\n")
var currentNode = FileSystemNode.directory(name: "/", contents: [])
var currentPath: [String] = []
while !lines.isEmpty {
let line = lines.removeFirst()
switch line {
case "$ cd /":
currentNode = FileSystemNode.directory(name: "/", contents: [])
currentPath = []
case "$ cd ..":
currentPath.removeLast()
currentNode = currentPath.reduce(currentNode) { $0.contents.first(where: { $0.name == $1 })! }
case let "$ cd \(dirName)":
currentPath.append(dirName)
currentNode = FileSystemNode.directory(name: dirName, contents: [])
case let "$ ls":
var contents: [FileSystemNode] = []
while !lines.isEmpty && !lines.first!.starts(with: "$") {
let content = lines.removeFirst()
if content.starts(with: "dir") {
let dirName = content.split(separator: " ").last!
contents.append(FileSystemNode.directory(name: dirName, contents: []))
} else {
let size = Int(content.split(separator: " ").first!)!
let fileName = content.split(separator: " ").last!
contents.append(FileSystemNode.file(name: fileName, size: size))
}
}
currentNode.contents = contents
default:
break
}
}
return currentNode
}
func findDirectories(maxSize: Int) -> [FileSystemNode] {
switch self {
case .file:
return []
case .directory(let contents):
var directories = contents.reduce([], { $0 + $1.findDirectories(maxSize: maxSize) })
if totalSize <= maxSize {
directories.append(self)
}
return directories
}
}
}```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 size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(let contents):
return contents.reduce(0, { max($0, $1.treeDepth) }) + 1
}
}
}
// File system manager with additional methods for parsing and manipulating file system.
extension FileSystemNode {
static func parse(_ input: String) -> FileSystemNode {
var lines = input.split(separator: "\n")
var currentNode = FileSystemNode.directory(name: "/", contents: [])
var currentPath: [String] = []
while !lines.isEmpty {
let line = lines.removeFirst()
switch line {
case "$ cd /":
currentNode = FileSystemNode.directory(name: "/", contents: [])
currentPath = []
case "$ cd ..":
currentPath.removeLast()
currentNode = currentPath.reduce(currentNode) { $0.contents.first(where: { $0.name == $1 })! }
case let "$ cd \(dirName)":
currentPath.append(dirName)
currentNode = FileSystemNode.directory(name: dirName, contents: [])
case let "$ ls":
var contents: [FileSystemNode] = []
while !lines.isEmpty && !lines.first!.starts(with: "$") {
let content = lines.removeFirst()
if content.starts(with: "dir") {
let dirName = content.split(separator: " ").last!
contents.append(FileSystemNode.directory(name: dirName, contents: []))
} else {
let size = Int(content.split(separator: " ").first!)!
let fileName = content.split(separator: " ").last!
contents.append(FileSystemNode.file(name: fileName, size: size))
}
}
currentNode.contents = contents
default:
break
}
}
return currentNode
}
func findDirectories(maxSize: Int) -> [FileSystemNode] {
switch self {
case .file:
return []
case .directory(let contents):
var directories = contents.reduce([], { $0 + $1.findDirectories(maxSize: maxSize) })
if totalSize <= maxSize {
directories.append(self)
}
return directories
}
}
}
let input = """
$ cd /
$ ls
dir a
14848514 b.txt
8504156 c.dat
dir d
$ cd a
$ ls
dir e
29116 f
2557 g
62596 h.lst
$ cd e
$ ls
584 i
$ cd ..
$ cd ..
$ cd d
$ ls
4060174 j
8033020 d.log
5626152 d.ext
7214296 k
"""
let fileSystem = FileSystemNode.parse(input)
print(fileSystem.totalSize)
print(fileSystem.filesCount)
print(fileSystem.treeDepth)
print(fileSystem.findDirectories(maxSize: 100000).reduce(0, { $0 + $1.totalSize }))
```case .file(let size): // enum case 'file' has 2 associated values; matching them as a tuple is deprecatedreturn size // cannot convert return expression of type '(name: String, size: Int)' to return type 'Int'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.totalSize }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.filesCount }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { max($0, $1.treeDepth) }) + 1 // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'currentNode = currentPath.reduce(currentNode) { $0.contents.first(where: { $0.name == $1 })! } // value of type 'FileSystemNode' has no member 'contents'currentNode = currentPath.reduce(currentNode) { $0.contents.first(where: { $0.name == $1 })! } // contextual closure type '(FileSystemNode, String) throws -> FileSystemNode' expects 2 arguments, but 1 was used in closure bodycase let "$ cd \(dirName)": // pattern variable binding cannot appear in an expressioncase let "$ cd \(dirName)": // 'let' pattern has no effect; sub-pattern didn't bind any variablescurrentPath.append(dirName) // cannot find 'dirName' in scopecurrentNode = FileSystemNode.directory(name: dirName, contents: []) // cannot find 'dirName' in scopecase let "$ ls": // 'let' pattern has no effect; sub-pattern didn't bind any variablescontents.append(FileSystemNode.directory(name: dirName, contents: [])) // cannot convert value of type 'Substring.SubSequence' (aka 'Substring') to expected argument type 'String'contents.append(FileSystemNode.file(name: fileName, size: size)) // cannot convert value of type 'Substring.SubSequence' (aka 'Substring') to expected argument type 'String'currentNode.contents = contents // value of type 'FileSystemNode' has no member 'contents'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedvar directories = contents.reduce([], { $0 + $1.findDirectories(maxSize: maxSize) }) // 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 .file(let size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(let contents):
return contents.reduce(0, { max($0, $1.treeDepth) }) + 1
}
}
}
extension FileSystemNode {
static func build(from input: String) -> FileSystemNode {
let lines = input.split(separator: "\n")
var root = FileSystemNode.directory(name: "/", contents: [])
var currentNode = &root
var currentPath: [String] = []
for line in lines {
let lineParts = line.split(separator: " ")
switch lineParts[0] {
case "$":
switch lineParts[1] {
case "cd":
switch lineParts[2]:
case "..":
currentPath.removeLast()
currentNode = ¤tNode!.contents.first(where: { $0.name == currentPath.last })!
case "/":
currentNode = &root
currentPath = []
default:
currentPath.append(lineParts[2].description)
currentNode = ¤tNode!.contents.first(where: { $0.name == lineParts[2].description })!
}
case "ls":
continue
default:
fatalError("Unknown command")
}
case "dir":
currentNode!.contents.append(FileSystemNode.directory(name: lineParts[1].description, contents: []))
default:
currentNode!.contents.append(FileSystemNode.file(name: lineParts[1].description, size: Int(lineParts[0])!))
}
}
return 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(let size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(let contents):
return contents.reduce(0, { max($0, $1.treeDepth) }) + 1
}
}
}
// File system manager with file system tree.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
static func build(from input: String) -> FileSystemNode {
let lines = input.split(separator: "\n")
var root = FileSystemNode.directory(name: "/", contents: [])
var currentNode = &root
var currentPath: [String] = []
for line in lines {
let lineParts = line.split(separator: " ")
switch lineParts[0] {
case "$":
switch lineParts[1] {
case "cd":
switch lineParts[2]:
case "..":
currentPath.removeLast()
currentNode = ¤tNode!.contents.first(where: { $0.name == currentPath.last })!
case "/":
currentNode = &root
currentPath = []
default:
currentPath.append(lineParts[2].description)
currentNode = ¤tNode!.contents.first(where: { $0.name == lineParts[2].description })!
}
case "ls":
continue
default:
fatalError("Unknown command")
}
case "dir":
currentNode!.contents.append(FileSystemNode.directory(name: lineParts[1].description, contents: []))
default:
currentNode!.contents.append(FileSystemNode.file(name: lineParts[1].description, size: Int(lineParts[0])!))
}
}
return root
}
}
let input = """
$ cd /
$ ls
dir a
14848514 b.txt
8504156 c.dat
dir d
$ cd a
$ ls
dir e
29116 f
2557 g
62596 h.lst
$ cd e
$ ls
584 i
$ cd ..
$ cd ..
$ cd d
$ ls
4060174 j
8033020 d.log
5626152 d.ext
7214296 k
"""
let fileSystem = FileSystemNode.build(from: input)
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
```case .file(let size): // enum case 'file' has 2 associated values; matching them as a tuple is deprecatedreturn size // cannot convert return expression of type '(name: String, size: Int)' to return type 'Int'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.totalSize }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.filesCount }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { max($0, $1.treeDepth) }) + 1 // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'var currentNode = &root // '&' may only be used to pass an argument to inout parameterswitch lineParts[2]: // expected '{' after 'switch' subject expressionswitch lineParts[2]: // consecutive statements on a line must be separated by ';'switch lineParts[2]: // expected expressioncurrentNode = ¤tNode!.contents.first(where: { $0.name == currentPath.last })! // '&' may only be used to pass an argument to inout parametercurrentNode = &root // '&' may only be used to pass an argument to inout parametercurrentNode = ¤tNode!.contents.first(where: { $0.name == lineParts[2].description })! // '&' may only be used to pass an argument to inout parametercase "dir": // 'case' label can only appear inside a 'switch' statementdefault: // 'default' label can only appear inside a 'switch' statementreturn root // expected declaration} // extraneous '}' at top levelindirect 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 size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth })
}
}
}
extension FileSystemNode {
static func build(from input: [String]) -> FileSystemNode {
var currentPath = [String]()
var currentNode = FileSystemNode.directory(name: "/", contents: [])
var rootNode = currentNode
for line in input {
if line.starts(with: "$ cd ") {
let path = line.dropFirst(5)
if path == "/" {
currentPath = ["/"]
currentNode = rootNode
} else if path == ".." {
currentPath.removeLast()
currentNode = currentPath.reduce(rootNode) { $0.contents.first(where: { $0.name == $1 })! }
} else {
currentPath.append(String(path))
currentNode = FileSystemNode.directory(name: String(path), contents: [])
}
} else if line.starts(with: "$ ls") {
continue
} else if line.starts(with: "dir ") {
let name = String(line.dropFirst(4))
currentNode.contents.append(FileSystemNode.directory(name: name, contents: []))
} else {
let (size, name) = line.split(separator: " ")
currentNode.contents.append(FileSystemNode.file(name: String(name), size: Int(String(size))!))
}
}
return rootNode
}
}
extension FileSystemNode {
var totalSize: Int {
switch self {
case .file(let size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.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(let size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth })
}
}
}
// File system manager.
// Used to build file system from input data.
extension FileSystemNode {
static func build(from input: [String]) -> FileSystemNode {
var currentPath = [String]()
var currentNode = FileSystemNode.directory(name: "/", contents: [])
var rootNode = currentNode
for line in input {
if line.starts(with: "$ cd ") {
let path = line.dropFirst(5)
if path == "/" {
currentPath = ["/"]
currentNode = rootNode
} else if path == ".." {
currentPath.removeLast()
currentNode = currentPath.reduce(rootNode) { $0.contents.first(where: { $0.name == $1 })! }
} else {
currentPath.append(String(path))
currentNode = FileSystemNode.directory(name: String(path), contents: [])
}
} else if line.starts(with: "$ ls") {
continue
} else if line.starts(with: "dir ") {
let name = String(line.dropFirst(4))
currentNode.contents.append(FileSystemNode.directory(name: name, contents: []))
} else {
let (size, name) = line.split(separator: " ")
currentNode.contents.append(FileSystemNode.file(name: String(name), size: Int(String(size))!))
}
}
return rootNode
}
}
// File system manager.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
var totalSize: Int {
switch self {
case .file(let size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth })
}
}
}
// File system manager.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
var totalSize: Int {
switch self {
case .file(let size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return 1 + contents.reduce(0,extension FileSystemNode: FileSystemInfo { // type 'FileSystemNode' does not conform to protocol 'FileSystemInfo'case .file(let size): // enum case 'file' has 2 associated values; matching them as a tuple is deprecatedreturn size // cannot convert return expression of type '(name: String, size: Int)' to return type 'Int'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.totalSize }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.filesCount }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn 1 + contents.reduce(0, { $0 > $1.treeDepth ? $0 : $1.treeDepth }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'currentNode = currentPath.reduce(rootNode) { $0.contents.first(where: { $0.name == $1 })! } // value of type 'FileSystemNode' has no member 'contents'currentNode = currentPath.reduce(rootNode) { $0.contents.first(where: { $0.name == $1 })! } // contextual closure type '(FileSystemNode, String) throws -> FileSystemNode' expects 2 arguments, but 1 was used in closure bodycurrentNode.contents.append(FileSystemNode.directory(name: name, contents: [])) // value of type 'FileSystemNode' has no member 'contents'let (size, name) = line.split(separator: " ") // no 'split' candidates produce the expected contextual result type '(_, _)'currentNode.contents.append(FileSystemNode.file(name: String(name), size: Int(String(size))!)) // value of type 'FileSystemNode' has no member 'contents'var totalSize: Int { // invalid redeclaration of 'totalSize'case .file(let size): // enum case 'file' has 2 associated values; matching them as a tuple is deprecatedreturn size // cannot convert return expression of type '(name: String, size: Int)' to return type 'Int'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.totalSize }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'var filesCount: Int { // invalid redeclaration of 'filesCount'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.filesCount }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'var treeDepth: Int { // invalid redeclaration of 'treeDepth'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn 1 + contents.reduce(0, { $0 > $1.treeDepth ? $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 .file(let size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(let contents):
return 1 + contents.reduce(0, { max($0, $1.treeDepth) })
}
}
}
extension FileSystemNode {
static func build(from commands: [String]) -> FileSystemNode {
var currentPath = ["/"]
var currentNode = FileSystemNode.directory(name: "/", contents: [])
var root = currentNode
for command in commands {
if command.starts(with: "$ cd") {
let path = command.suffix(from: 5)
if path == ".." {
currentPath.removeLast()
} else if path != "/" {
currentPath.append(path)
}
currentNode = root
for path in currentPath[1...] {
if case .directory(let contents) = currentNode {
currentNode = contents.first(where: { $0.name == path })!
}
}
} else if command.starts(with: "$ ls") {
continue
} else if command.starts(with: "dir") {
let name = command.suffix(from: 4)
if case .directory(let contents) = currentNode {
contents.append(FileSystemNode.directory(name: name, contents: []))
}
} else {
let (size, name) = command.split(separator: " ")
if case .directory(let contents) = currentNode {
contents.append(FileSystemNode.file(name: String(name), size: Int(String(size))!))
}
}
}
return root
}
}
extension FileSystemNode {
func totalSizeOfDirectories(withMaxSize maxSize: Int) -> Int {
switch self {
case .file:
return 0
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSizeOfDirectories(withMaxSize: maxSize) }) + (totalSize <= maxSize ? totalSize : 0)
}
}
}
extension FileSystemNode {
func totalSizeOfDirectories(withMinSize minSize: Int) -> Int {
switch self {
case .file:
return 0
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSizeOfDirectories(withMinSize: minSize) }) + (totalSize >= minSize ? totalSize : 0)
}
}
}```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 size):
return size
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(let contents):
return 1 + contents.reduce(0, { max($0, $1.treeDepth) })
}
}
}
// File system manager with additional methods to build file system tree.
extension FileSystemNode {
static func build(from commands: [String]) -> FileSystemNode {
var currentPath = ["/"]
var currentNode = FileSystemNode.directory(name: "/", contents: [])
var root = currentNode
for command in commands {
if command.starts(with: "$ cd") {
let path = command.suffix(from: 5)
if path == ".." {
currentPath.removeLast()
} else if path != "/" {
currentPath.append(path)
}
currentNode = root
for path in currentPath[1...] {
if case .directory(let contents) = currentNode {
currentNode = contents.first(where: { $0.name == path })!
}
}
} else if command.starts(with: "$ ls") {
continue
} else if command.starts(with: "dir") {
let name = command.suffix(from: 4)
if case .directory(let contents) = currentNode {
contents.append(FileSystemNode.directory(name: name, contents: []))
}
} else {
let (size, name) = command.split(separator: " ")
if case .directory(let contents) = currentNode {
contents.append(FileSystemNode.file(name: String(name), size: Int(String(size))!))
}
}
}
return root
}
}
// File system manager with additional methods to calculate total size of all directories with size less than or equal to maxSize.
extension FileSystemNode {
func totalSizeOfDirectories(withMaxSize maxSize: Int) -> Int {
switch self {
case .file:
return 0
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSizeOfDirectories(withMaxSize: maxSize) }) + (totalSize <= maxSize ? totalSize : 0)
}
}
}
// File system manager with additional methods to calculate total size of all directories with size greater than or equal to minSize.
extension FileSystemNode {
func totalSizeOfDirectories(withMinSize minSize: Int) -> Int {
switch self {
case .file:
return 0
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSizeOfDirectories(withMinSize: minSize) }) + (totalSize >= minSize ? totalSize : 0)
}
}
}
// File system manager with additional methods to calculate total size of all directories with size less than or equal to maxSize.
extension FileSystemNode {
func totalSizeOfDirectories(withMaxSize maxSize: Int) -> Int {
switch self {
case .file:
return 0
case .directory(let contents):
return contents.reduce(0, { $0 + $1.totalSizeOfDirectories(withMaxSize: maxSize) }) + (totalSize <= maxSize ? totalSize : 0)
}
}
// File system manager with additional methods to calculate total size of all directories with size greater than or equal to minSize.
extension FileSystemNode {
func totalSizeOfDirectoriescase .file(let size): // enum case 'file' has 2 associated values; matching them as a tuple is deprecatedreturn size // cannot convert return expression of type '(name: String, size: Int)' to return type 'Int'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.totalSize }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.filesCount }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn 1 + contents.reduce(0, { max($0, $1.treeDepth) }) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'let path = command.suffix(from: 5) // cannot convert value of type 'Int' to expected argument type 'String.Index'if case .directory(let contents) = currentNode { // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedcurrentNode = contents.first(where: { $0.name == path })! // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'first'let name = command.suffix(from: 4) // cannot convert value of type 'Int' to expected argument type 'String.Index'if case .directory(let contents) = currentNode { // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedcontents.append(FileSystemNode.directory(name: name, contents: [])) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'append'let (size, name) = command.split(separator: " ") // no 'split' candidates produce the expected contextual result type '(_, _)'if case .directory(let contents) = currentNode { // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedcontents.append(FileSystemNode.file(name: String(name), size: Int(String(size))!)) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'append'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.totalSizeOfDirectories(withMaxSize: maxSize) }) + (totalSize <= maxSize ? totalSize : 0) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'case .directory(let contents): // enum case 'directory' has 2 associated values; matching them as a tuple is deprecatedreturn contents.reduce(0, { $0 + $1.totalSizeOfDirectories(withMinSize: minSize) }) + (totalSize >= minSize ? totalSize : 0) // value of tuple type '(name: String, contents: [FileSystemNode])' has no member 'reduce'protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
// The stack of elements.
fileprivate var storage: [Element] = []
// Initializes an empty stack.
public init() {}
// Pushes an element onto the stack.
public func push(_ element: Element) {
storage.append(element)
}
// Pops an element off the stack.
public 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 {
// The stack of elements.
fileprivate var storage: [Element] = []
// Initializes an empty stack.
public init() {}
// Pushes an element onto the stack.
public func push(_ element: Element) {
storage.append(element)
}
// Pops an element off the stack.
public func pop() -> Element? {
return storage.popLast()
}
}
// A stack of integers.
let numberStack = Stack<Int>()
numberStack.push(1)
numberStack.push(2)
numberStack.push(3)
// A stack of strings.
let stringStack = Stack<String>()
stringStack.push("one")
stringStack.push("two")
stringStack.push("three")
// Pop the elements from the stacks and print them.
print(numberStack.pop()!)
print(numberStack.pop()!)
print(numberStack.pop()!)
print(stringStack.pop()!)
print(stringStack.pop()!)
print(stringStack.pop()!)
```public init() {} // 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 {
var storage: [Element] = []
init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
extension StackProtocol {
func pop() -> Element? {
return nil
}
}
extension StackProtocol {
func push(_ element: Element) {
// Do nothing.
}
}```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 storage: [Element] = []
init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that provides a default implementation of the
// `pop` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func pop() -> Element? {
return nil
}
}
// A protocol extension that provides a default implementation of the
// `push` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func push(_ element: Element) {
// Do nothing.
}
}
// A protocol extension that provides a default implementation of the
// `pop` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func pop() -> Element? {
return nil
}
}
// A protocol extension that provides a default implementation of the
// `push` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func push(_ element: Element) {
// Do nothing.
}
}
// A protocol extension that provides a default implementation of the
// `pop` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func pop() -> Element? {
return nil
}
}
// A protocol extension that provides a default implementation of the
// `push` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func push(_ element: Element) {
// Do nothing.
}
}
// A protocol extension that provides a default implementation of the
// `pop` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func pop() -> Element? {
return nil
}
}
// A protocol extension that provides a default implementation of the
// `push` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func push(_ element: Element) {
// Do nothing.
}
}
// A protocol extension that provides a default implementation of the
// `pop` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func pop() -> Element? {
return nil
}
}
// A protocol extension that provides a default implementation of the
// `push` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func push(_ element: Element) {
// Do nothing.
}
}
// A protocol extension that provides a default implementation of the
// `pop` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func pop() -> Element? {
return nil
}
}
// A protocol extension that provides a default implementation of the
// `push` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func push(_ element: Element) {
// Do nothing.
}
}
// A protocol extension that provides a default implementation of the
// `pop` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func pop() -> Element? {
return nil
}
}
// A protocol extension that provides a default implementation of the
// `push` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func push(_ element: Element) {
// Do nothing.
}
}
// A protocol extension that provides a default implementation of the
// `pop` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func pop() -> Element? {
return nil
}
}
// A protocol extension that provides a default implementation of the
// `push` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
func push(_ element: Element) {
// Do nothing.
}
}
// A protocol extension that provides a default implementation of the
// `pop` function for any type that conforms to the `StackProtocol` protocol.
extension StackProtocol {
funcinit() {} // 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 {
var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
extension Stack {
func pop() -> Element? {
return elements.popLast()
}
}
extension Stack {
func push(_ element: Element) {
elements.append(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] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.pop() function.
extension Stack {
func pop() -> Element? {
return elements.popLast()
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
elements.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {class Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class Stack<Element>: StackProtocol { // type 'Stack<Element>' does not conform to protocol 'StackProtocol'func pop() -> Element? { // invalid redeclaration of 'pop()'func push(_ element: Element) { // invalid redeclaration of 'push'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()
}
}```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()
}
}
// A stack of integers.
let numberStack = Stack<Int>()
numberStack.push(1)
numberStack.push(2)
numberStack.push(3)
// A stack of strings.
let stringStack = Stack<String>()
stringStack.push("one")
stringStack.push("two")
stringStack.push("three")
// A stack of booleans.
let booleanStack = Stack<Bool>()
booleanStack.push(true)
booleanStack.push(false)
booleanStack.push(true)
// A stack of characters.
let characterStack = Stack<Character>()
characterStack.push("a")
characterStack.push("b")
characterStack.push("c")
// A stack of any type.
let anyStack = Stack<Any>()
anyStack.push(1)
anyStack.push("two")
anyStack.push(true)
anyStack.push(4.0)
// A stack of any type that conforms to the Equatable protocol.
let equatableStack = Stack<Equatable>()
equatableStack.push(1)
equatableStack.push("two")
equatableStack.push(true)
equatableStack.push(4.0)
// A stack of any type that conforms to the Hashable protocol.
let hashableStack = Stack<Hashable>()
hashableStack.push(1)
hashableStack.push("two")
hashableStack.push(true)
hashableStack.push(4.0)
// A stack of any type that conforms to the Comparable protocol.
let comparableStack = Stack<Comparable>()
comparableStack.push(1)
comparableStack.push("two")
comparableStack.push(true)
comparableStack.push(4.0)
// A stack of any type that conforms to the Sequence protocol.
let sequenceStack = Stack<Sequence>()
sequenceStack.push(1)
sequenceStack.push("two")
sequenceStack.push(true)
sequenceStack.push(4.0)
// A stack of any type that conforms to the Collection protocol.
let collectionStack = Stack<Collection>()
collectionStack.push(1)
collectionStack.push("two")
collectionStack.push(true)
collectionStack.push(4.0)
// A stack of any type that conforms to the Mappable protocol.
let mappableStack = Stack<Mappable>()
mappableStack.push(1)
mappableStack.push("two")
mappableStack.push(true)
mappableStack.push(4.0)
// A stack of any type that conforms to the Reducible protocol.
let reducibleStack = Stack<Reducible>()
reducibleStack.push(1)
reducibleStack.push("two")
reducibleStack.push(true)
reducibleStack.push(4.0)
// A stack of any type that conforms to the Sequence protocol.
let sequenceStack = Stack<Sequence>()
sequenceStack.push(1)
sequenceStack.push("two")
sequenceStack.push(true)
sequenceStack.push(4.0)
// A stack of any type that conforms to the Collection protocol.
let collectionStack = Stack<Collection>()
collectionStack.push(1)
collectionStack.push("two")
collectionStack.push(true)
collectionStack.push(4.0)
// A stack of any type that conforms to the Mappable protocol.
let mappableStack = Stack<Mappable>()
mappableStack.push(1)
mappableStack.push("two")
mappableStack.push(true)
mappableStack.push(4.0)
// A stack of any type that conforms to the Reducible protocol.
let reducibleStack = Stack<Reducible>()
reducibleStack.push(1)
reducibleStack.push("two")
reducibleStack.push(true)
reducibleStack.push(4.init() {} // 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 {
var storage: [Element] = []
init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
extension Stack {
func peek() -> Element? {
return storage.last
}
}```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 storage: [Element] = []
init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack.
extension Stack {
func peek() ->init() {} // 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 {
var items = [Element]()
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
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 {
var items = [Element]()
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack of integers.
let numberStack = Stack<Int>()
numberStack.push(1)
numberStack.push(2)
numberStack.push(3)
print(numberStack.pop()!)
print(numberStack.pop()!)
print(numberStack.pop()!)
print(numberStack.pop()!)
```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 storage: [Element] = []
init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
extension StackProtocol {
func peek() -> Element? {
return storage.last
}
}
extension Stack {
func peek() -> Element? {
return storage.last
}
}
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}```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 storage: [Element] = []
init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that adds a peek function to any stack type.
extension StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack: StackProtocol {
func peek() -> Element? {
return storage.last
}
}
// A protocol extension that adds a peek function to any stack type.
extension Stack:init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'return storage.last // cannot find 'storage' in scopeextension Stack: StackProtocol { // redundant conformance of 'Stack<Element>' to protocol 'StackProtocol'func peek() -> Element? { // invalid redeclaration of 'peek()'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 storage: [Element] = []
init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
extension Stack {
func pop() -> Element? {
return storage.popLast()
}
}
extension Stack {
func push(_ element: Element) {
storage.append(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 storage: [Element] = []
init() {}
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.pop() function.
extension Stack {
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
storage.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.pop() function.
extension Stack {
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
storage.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.pop() function.
extension Stack {
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
storage.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.pop() function.
extension Stack {
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
storage.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.pop() function.
extension Stack {
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
storage.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.pop() function.
extension Stack {
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
storage.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.pop() function.
extension Stack {
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
storage.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.pop() function.
extension Stack {
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
storage.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.pop() function.
extension Stack {
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
storage.append(element)
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.pop() function.
extension Stack {
func pop() -> Element? {
return storage.popLast()
}
}
// A protocol extension that provides a default implementation of the
// StackProtocol.push() function.
extension Stack {
func push(_ element: Element) {
storageclass Stack<Element> : StackProtocol { // type 'Stack<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'func pop() -> Element? { // invalid redeclaration of 'pop()'func push(_ element: Element) { // invalid redeclaration of 'push'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()
}
}```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()
}
}
// A stack of integers.
let numberStack = Stack<Int>()
numberStack.push(10)
numberStack.push(20)
numberStack.push(30)
// Pop the stack and print the numbers.
while let number = numberStack.pop() {
print(number)
}
// Prints "30"
// Prints "20"
// Prints "10"
```init() {} // 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 {
var items = [Element]()
init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
extension Stack {
func pop() -> Element? {
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 {
var items = [Element]()
init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popLast()
}
}
// A protocol extension that provides a default implementation of the `pop()` function.
extension Stack {
func pop() -> Element? {
return items.popclass Stack<Element> : StackProtocol { // type 'Stack<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'func pop() -> Element? { // invalid redeclaration of 'pop()'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 var capacity: Int
private var cache: [Key: Element]
private var lru: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.lru = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
lru.removeAll(where: { $0 == key })
lru.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count >= capacity {
let leastRecentlyUsedKey = lru.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
lru.removeAll(where: { $0 == key })
lru.append(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 lru: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.lru = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
lru.removeAll(where: { $0 == key })
lru.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count >= capacity {
let leastRecentlyUsedKey = lru.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
lru.removeAll(where: { $0 == key })
lru.append(key)
}
}
}
}
// Usage example
let cache = Cache<String, Int>(capacity: 3)
cache["key1"] = 1
cache["key2"] = 2
cache["key3"] = 3
cache["key4"] = 4
print(cache["key1"]) // nil
print(cache["key2"]) // 2
print(cache["key3"]) // 3
print(cache["key4"]) // 4
```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, Value> : CacheProtocol {
private var capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Value? {
get {
if let value = cache[key] {
queue.removeAll(where: { $0 == key })
queue.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count == capacity {
let leastRecentlyUsedKey = queue.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
queue.removeAll(where: { $0 == key })
queue.append(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, Value> : CacheProtocol {
private var capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Value? {
get {
if let value = cache[key] {
queue.removeAll(where: { $0 == key })
queue.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count == capacity {
let leastRecentlyUsedKey = queue.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
queue.removeAll(where: { $0 == key })
queue.append(key)
}
}
}
}
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
print(cache["a"]) // nil
print(cache["b"]) // 2
print(cache["c"]) // 3
print(cache["d"]) // 4
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Value>'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
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count >= capacity {
let leastRecentlyUsedKey = accessOrder.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(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
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count >= capacity {
let leastRecentlyUsedKey = accessOrder.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(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 capacity: Int
private var cache: [Key: Element]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
queue.removeAll(where: { $0 == key })
queue.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count == capacity {
let leastRecentlyUsedKey = queue.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
queue.removeAll(where: { $0 == key })
queue.append(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 queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
queue.removeAll(where: { $0 == key })
queue.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count == capacity {
let leastRecentlyUsedKey = queue.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
queue.removeAll(where: { $0 == key })
queue.append(key)
}
}
}
}
// Example usage
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: 1
cache["d"] = 4
print(cache["b"]) // Output: nil
print(cache["d"]) // Output: 4
```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 lru: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.lru = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
lru.removeAll(where: { $0 == key })
lru.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count >= capacity {
let lruKey = lru.removeFirst()
cache.removeValue(forKey: lruKey)
}
cache[key] = value
lru.append(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 lru: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.lru = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
lru.removeAll(where: { $0 == key })
lru.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count >= capacity {
let lruKey = lru.removeFirst()
cache.removeValue(forKey: lruKey)
}
cache[key] = value
lru.append(key)
}
}
}
}
// Usage example:
let cache = Cache<String, Int>(capacity: 3)
cache["one"] = 1
cache["two"] = 2
cache["three"] = 3
cache["four"] = 4
print(cache["one"]) // nil
print(cache["two"]) // 2
print(cache["three"]) // 3
print(cache["four"]) // 4
```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
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count >= capacity {
let leastRecentlyUsedKey = accessOrder.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(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
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count >= capacity {
let leastRecentlyUsedKey = accessOrder.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
}
}
}
}
// Usage example
let cache = Cache<String, Int>(capacity: 3)
cache["one"] = 1
cache["two"] = 2
cache["three"] = 3
cache["four"] = 4
print(cache["one"]) // nil
print(cache["two"]) // 2
print(cache["three"]) // 3
print(cache["four"]) // 4
```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
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count >= capacity {
let leastRecentlyUsedKey = accessOrder.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(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
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count >= capacity {
let leastRecentlyUsedKey = accessOrder.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
}
}
}
}
// Usage example
let cache = Cache<String, Int>(capacity: 3)
cache["one"] = 1
cache["two"] = 2
cache["three"] = 3
print(cache["one"]) // Output: Optional(1)
cache["four"] = 4
print(cache["two"]) // Output: nil
print(cache["one"]) // Output: Optional(1)
print(cache["four"]) // Output: Optional(4)
```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 lru: [Key] = []
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
lru.removeAll(where: { $0 == key })
lru.append(key)
return element
}
return nil
}
set {
if let element = newValue {
if cache.count >= capacity {
let lruKey = lru.removeFirst()
cache.removeValue(forKey: lruKey)
}
cache[key] = element
lru.append(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 lru: [Key] = []
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
lru.removeAll(where: { $0 == key })
lru.append(key)
return element
}
return nil
}
set {
if let element = newValue {
if cache.count >= capacity {
let lruKey = lru.removeFirst()
cache.removeValue(forKey: lruKey)
}
cache[key] = element
lru.append(key)
}
}
}
}
// Example usage
let cache = Cache<String, Int>(capacity: 3)
cache["one"] = 1
cache["two"] = 2
cache["three"] = 3
cache["four"] = 4
print(cache["one"]) // nil
print(cache["two"]) // 2
print(cache["three"]) // 3
print(cache["four"]) // 4
```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 queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
queue.removeAll(where: { $0 == key })
queue.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count == capacity {
let leastRecentlyUsedKey = queue.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
queue.removeAll(where: { $0 == key })
queue.append(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 queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
queue.removeAll(where: { $0 == key })
queue.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count == capacity {
let leastRecentlyUsedKey = queue.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
queue.removeAll(where: { $0 == key })
queue.append(key)
}
}
}
}
// Example usage
let cache = Cache<String, Int>(capacity: 3)
cache["one"] = 1
cache["two"] = 2
cache["three"] = 3
cache["four"] = 4
print(cache["one"]) // nil
print(cache["two"]) // 2
print(cache["three"]) // 3
print(cache["four"]) // 4
```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 queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
queue.removeAll(where: { $0 == key })
queue.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count == capacity {
let leastRecentlyUsedKey = queue.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
queue.removeAll(where: { $0 == key })
queue.append(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 queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
queue.removeAll(where: { $0 == key })
queue.append(key)
return value
}
return nil
}
set {
if let value = newValue {
if cache.count == capacity {
let leastRecentlyUsedKey = queue.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
cache[key] = value
queue.removeAll(where: { $0 == key })
queue.append(key)
}
}
}
}
// Usage example:
let cache = Cache<String, Int>(capacity: 3)
cache["key1"] = 1
cache["key2"] = 2
cache["key3"] = 3
cache["key4"] = 4
print(cache["key1"]) // nil
print(cache["key2"]) // 2
print(cache["key3"]) // 3
print(cache["key4"]) // 4
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'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, Date)] = [:]
private var expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date())
}
func get(key: Key) -> Value? {
if let (value, date) = cache[key] {
if date.timeIntervalSinceNow > expiration {
cache.removeValue(forKey: key)
return nil
}
return value
}
return 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 var cache: [Key: (Value, Date)] = [:]
private var expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date())
}
func get(key: Key) -> Value? {
if let (value, date) = cache[key] {
if date.timeIntervalSinceNow > expiration {
cache.removeValue(forKey: key)
return nil
}
return value
}
return nil
}
}
// Usage
let cache = ExpirableCache<String, String>(expiration: 10)
cache.put(value: "Hello", key: "key", expiration: 10)
print(cache.get(key: "key")) // "Hello"
// After 10 seconds
print(cache.get(key: "key")) // nil
```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 var cache: [Key: (Value, Date)] = [:]
private var expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date())
}
func get(key: Key) -> Value? {
if let (value, date) = cache[key] {
if date.timeIntervalSinceNow > expiration {
cache.removeValue(forKey: key)
return nil
}
return value
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: expiration)
}
}
}
}```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.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date())
}
func get(key: Key) -> Value? {
if let (value, date) = cache[key] {
if date.timeIntervalSinceNow > expiration {
cache.removeValue(forKey: key)
return nil
}
return value
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: expiration)
}
}
}
}
// Usage example
let cache = ExpirableCache<String, String>(expiration: 5)
cache["key"] = "value"
print(cache["key"]) // "value"
sleep(6)
print(cache["key"]) // nil
```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 var cache: [Key: (Value, Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 300)
}
}
}
}```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)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 300)
}
}
}
}
let cache = ExpirableCache<String, String>()
cache["key"] = "value"
print(cache["key"])
// Prints "Optional("value")"
cache["key"] = nil
print(cache["key"])
// Prints "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 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)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 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 var cache: [Key: (Value, Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 10)
}
}
}
}
let cache = ExpirableCache<String, String>()
cache["key"] = "value"
print(cache["key"]) // "value"
print(cache["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 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)] = [:]
// MARK: - ExpirableCacheProtocol
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
}
}
return nil
}
// MARK: - Subscript
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 10)
} 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)] = [:]
// MARK: - ExpirableCacheProtocol
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
}
}
return nil
}
// MARK: - Subscript
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 10)
} else {
cache.removeValue(forKey: key)
}
}
}
}
let cache = ExpirableCache<String, String>()
cache["foo"] = "bar"
print(cache["foo"]) // bar
print(cache["foo"]) // 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 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)]()
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 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 var cache = [Key: (Value, Date)]()
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 10)
}
}
}
}
let cache = ExpirableCache<String, String>()
cache["foo"] = "bar"
cache["foo"] // "bar"
cache["foo"] = nil
cache["foo"] // 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 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)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 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 var cache: [Key: (Value, Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 10)
}
}
}
}
let cache = ExpirableCache<String, String>()
cache["key"] = "value"
print(cache["key"])
// Prints "Optional("value")"
// After 10 seconds, the cache entry is removed.
sleep(10)
print(cache["key"])
// Prints "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 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)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 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 var cache: [Key: (Value, Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 10)
}
}
}
}
// Usage
let cache = ExpirableCache<String, String>()
cache["key"] = "value"
print(cache["key"]) // "value"
Thread.sleep(forTimeInterval: 11)
print(cache["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 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)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 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 var cache: [Key: (Value, Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 10)
}
}
}
}
let cache = ExpirableCache<String, String>()
cache["key"] = "value"
print(cache["key"]) // "value"
print(cache["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 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)] = [:]
// MARK: - ExpirableCacheProtocol
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
}
}
return nil
}
// MARK: - Subscript
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 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 var cache: [Key: (Value, Date)] = [:]
// MARK: - ExpirableCacheProtocol
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
}
}
return nil
}
// MARK: - Subscript
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 10)
}
}
}
}
// MARK: -
let cache = ExpirableCache<String, String>()
cache["foo"] = "bar"
print(cache["foo"]) // "bar"
sleep(10)
print(cache["foo"]) // 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 = Data(string.utf8)
let keyData = Data(key.utf8)
var encryptedData = Data()
for (index, byte) in data.enumerated() {
let keyByte = keyData[index % keyData.count]
let encryptedByte = byte ^ keyByte
encryptedData.append(encryptedByte)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
var decryptedData = Data()
for (index, byte) in data.enumerated() {
let keyByte = keyData[index % keyData.count]
let decryptedByte = byte ^ keyByte
decryptedData.append(decryptedByte)
}
return String(decryptedData: 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 = Data(string.utf8)
let keyData = Data(key.utf8)
var encryptedData = Data()
for (index, byte) in data.enumerated() {
let keyByte = keyData[index % keyData.count]
let encryptedByte = byte ^ keyByte
encryptedData.append(encryptedByte)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
var decryptedData = Data()
for (index, byte) in data.enumerated() {
let keyByte = keyData[index % keyData.count]
let decryptedByte = byte ^ keyByte
decryptedData.append(decryptedByte)
}
return String(decryptedData: decryptedData)
}
}
// Example usage
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secretkey"
let encryptedData = encryptor.encrypt(plainText, key)
print("Encrypted data: \(encryptedData)")
let decryptedText = encryptor.decrypt(encryptedData, key)
print("Decrypted text: \(decryptedText)")
// Output:
// Encrypted data: <00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 return String(decryptedData: decryptedData) // no exact matches in call to initializerprotocol 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(data.map { (dataByte, keyByte) in
return dataByte ^ keyByte
})
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(data.map { (dataByte, keyByte) in
return dataByte ^ keyByte
})
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 data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = Data(data.map { (dataByte, keyByte) in
return dataByte ^ keyByte
})
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(data.map { (dataByte, keyByte) in
return dataByte ^ keyByte
})
return String(data: decryptedData, encoding: .utf8)!
}
}
// Example usage
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secretkey"
let encryptedData = encryptor.encrypt(plainText, key)
print("Encrypted data: \(encryptedData)")
let decryptedText = encryptor.decrypt(encryptedData, key)
print("Decrypted text: \(decryptedText)")
```let encryptedData = Data(data.map { (dataByte, keyByte) in // contextual closure type '(Data.Element) throws -> UInt8' (aka '(UInt8) throws -> UInt8') expects 1 argument, but 2 were used in closure bodylet decryptedData = Data(data.map { (dataByte, keyByte) in // contextual closure type '(Data.Element) throws -> UInt8' (aka '(UInt8) throws -> UInt8') expects 1 argument, but 2 were used in closure bodyprotocol 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(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % keyData.count]
})
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % 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 data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = Data(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % keyData.count]
})
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % keyData.count]
})
return String(data: decryptedData, encoding: .utf8)!
}
}
// Example usage
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedText = encryptor.decrypt(encryptedData, key)
print(decryptedText) // Output: "Hello, World!"
```let encryptedData = Data(data.map { (byte, index) -> UInt8 in // contextual closure type '(Data.Element) throws -> UInt8' (aka '(UInt8) throws -> UInt8') expects 1 argument, but 2 were used in closure bodylet decryptedData = Data(data.map { (byte, index) -> UInt8 in // contextual closure type '(Data.Element) throws -> UInt8' (aka '(UInt8) throws -> UInt8') expects 1 argument, but 2 were used in closure bodyprotocol 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 keyData = key.data(using: .utf8)!
let encryptedData = Data(bytes: data.bytes.map { $0 ^ keyData.bytes.first! })
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = Data(bytes: data.bytes.map { $0 ^ keyData.bytes.first! })
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 data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
let encryptedData = Data(bytes: data.bytes.map { $0 ^ keyData.bytes.first! })
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = Data(bytes: data.bytes.map { $0 ^ keyData.bytes.first! })
return String(data: decryptedData, encoding: .utf8)!
}
}
// Example usage:
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
print("Encrypted data: \(encryptedData)")
let decryptedText = encryptor.decrypt(encryptedData, key)
print("Decrypted text: \(decryptedText)")
```let encryptedData = Data(bytes: data.bytes.map { $0 ^ keyData.bytes.first! }) // value of type 'Data' has no member 'bytes'let encryptedData = Data(bytes: data.bytes.map { $0 ^ keyData.bytes.first! }) // value of type 'Data' has no member 'bytes'let decryptedData = Data(bytes: data.bytes.map { $0 ^ keyData.bytes.first! }) // value of type 'Data' has no member 'bytes'let decryptedData = Data(bytes: data.bytes.map { $0 ^ keyData.bytes.first! }) // value of type 'Data' has no member 'bytes'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(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % keyData.count]
})
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % 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 data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = Data(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % keyData.count]
})
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % keyData.count]
})
return String(data: decryptedData, encoding: .utf8)!
}
}
// Example usage
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
print("Encrypted data: \(encryptedData)")
let decryptedText = encryptor.decrypt(encryptedData, key)
print("Decrypted text: \(decryptedText)")
```let encryptedData = Data(data.map { (byte, index) -> UInt8 in // contextual closure type '(Data.Element) throws -> UInt8' (aka '(UInt8) throws -> UInt8') expects 1 argument, but 2 were used in closure bodylet decryptedData = Data(data.map { (byte, index) -> UInt8 in // contextual closure type '(Data.Element) throws -> UInt8' (aka '(UInt8) throws -> UInt8') expects 1 argument, but 2 were used in closure bodyprotocol 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)
var encryptedData = Data()
var index = 0
for byte in data {
let encryptedByte = byte ^ keyData[index]
encryptedData.append(encryptedByte)
index = (index + 1) % keyData.count
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
var decryptedData = Data()
var index = 0
for byte in data {
let decryptedByte = byte ^ keyData[index]
decryptedData.append(decryptedByte)
index = (index + 1) % 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 data = Data(string.utf8)
let keyData = Data(key.utf8)
var encryptedData = Data()
var index = 0
for byte in data {
let encryptedByte = byte ^ keyData[index]
encryptedData.append(encryptedByte)
index = (index + 1) % keyData.count
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
var decryptedData = Data()
var index = 0
for byte in data {
let decryptedByte = byte ^ keyData[index]
decryptedData.append(decryptedByte)
index = (index + 1) % keyData.count
}
return String(data: decryptedData, encoding: .utf8) ?? ""
}
}
// Example usage
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
print("Encrypted data: \(encryptedData)")
let decryptedText = encryptor.decrypt(encryptedData, key)
print("Decrypted text: \(decryptedText)")
// Output:
// Encrypted data: <14 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 12 00 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(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % keyData.count]
})
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % 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 data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = Data(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % keyData.count]
})
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % keyData.count]
})
return String(data: decryptedData, encoding: .utf8) ?? ""
}
}
// Example usage
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
print("Encrypted data: \(encryptedData)")
let decryptedText = encryptor.decrypt(encryptedData, key)
print("Decrypted text: \(decryptedText)")
```let encryptedData = Data(data.map { (byte, index) -> UInt8 in // contextual closure type '(Data.Element) throws -> UInt8' (aka '(UInt8) throws -> UInt8') expects 1 argument, but 2 were used in closure bodylet decryptedData = Data(data.map { (byte, index) -> UInt8 in // contextual closure type '(Data.Element) throws -> UInt8' (aka '(UInt8) throws -> UInt8') expects 1 argument, but 2 were used in closure bodyprotocol 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(count: data.count) { (index) -> UInt8 in
return data[index] ^ keyData[index % keyData.count]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(count: data.count) { (index) -> UInt8 in
return data[index] ^ keyData[index % 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 data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = Data(count: data.count) { (index) -> UInt8 in
return data[index] ^ keyData[index % keyData.count]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(count: data.count) { (index) -> UInt8 in
return data[index] ^ keyData[index % keyData.count]
}
return String(data: decryptedData, encoding: .utf8) ?? ""
}
}
// Example usage
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
print("Encrypted data: \(encryptedData)")
let decryptedText = encryptor.decrypt(encryptedData, key)
print("Decrypted text: \(decryptedText)")
// Output:
// Encrypted data: <72 78 63 6e 68 65 6c 6c 6f 2c 20 57 6f 72 6c 64 21>
// Decrypted text: Hello, World!
```let encryptedData = Data(count: data.count) { (index) -> UInt8 in // no exact matches in call to initializerlet decryptedData = Data(count: data.count) { (index) -> UInt8 in // no exact matches in call to initializerprotocol 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(data.map { (byte, index) in
return byte ^ keyData[index % keyData.count]
})
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(data.map { (byte, index) in
return byte ^ keyData[index % 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 data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = Data(data.map { (byte, index) in
return byte ^ keyData[index % keyData.count]
})
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(data.map { (byte, index) in
return byte ^ keyData[index % keyData.count]
})
return String(data: decryptedData, encoding: .utf8) ?? ""
}
}
// Example usage
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
print("Encrypted data: \(encryptedData)")
let decryptedText = encryptor.decrypt(encryptedData, key)
print("Decrypted text: \(decryptedText)")
```let encryptedData = Data(data.map { (byte, index) in // contextual closure type '(Data.Element) throws -> UInt8' (aka '(UInt8) throws -> UInt8') expects 1 argument, but 2 were used in closure bodylet decryptedData = Data(data.map { (byte, index) in // contextual closure type '(Data.Element) throws -> UInt8' (aka '(UInt8) throws -> UInt8') expects 1 argument, but 2 were used in closure bodyprotocol 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(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % keyData.count]
})
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % 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 data = Data(string.utf8)
let keyData = Data(key.utf8)
let encryptedData = Data(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % keyData.count]
})
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = Data(data.map { (byte, index) -> UInt8 in
return byte ^ keyData[index % keyData.count]
})
return String(data: decryptedData, encoding: .utf8)!
}
}
// Example usage:
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
print("Encrypted data: \(encryptedData)")
let decryptedText = encryptor.decrypt(encryptedData, key)
print("Decrypted text: \(decryptedText)")
```let encryptedData = Data(data.map { (byte, index) -> UInt8 in // contextual closure type '(Data.Element) throws -> UInt8' (aka '(UInt8) throws -> UInt8') expects 1 argument, but 2 were used in closure bodylet decryptedData = Data(data.map { (byte, index) -> UInt8 in // contextual closure type '(Data.Element) throws -> UInt8' (aka '(UInt8) throws -> UInt8') expects 1 argument, but 2 were used in closure bodyprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = Date()
return true
}
}
// 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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = Date()
return true
}
}
// 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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = Date()
return true
}
}
// 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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = Date()
return true
}
}
// 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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
lastinit(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'lastRequestTime = Date() // cannot assign to value: 'lastRequestTime' is a 'let' constantThread.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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = currentTime.timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = currentTime.timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
}
lastRequestTime = currentTime
return true
}
}
// Usage example
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 10.0)
for _ in 0..<10 {
if rateLimiter.allowRequest() {
print("Request allowed")
} else {
print("Request denied")
}
}
// Output:
// Request allowed
// Request allowed
// Request allowed
// Request allowed
// Request allowed
// Request denied
// Request denied
// Request denied
// Request denied
// 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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let timeSinceLastRequest = currentTime.timeIntervalSince(lastRequestTime ?? currentTime)
if timeSinceLastRequest < timeInterval {
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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let timeSinceLastRequest = currentTime.timeIntervalSince(lastRequestTime ?? currentTime)
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = currentTime
return true
}
}
// Example usage
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 10.0)
for _ in 0..<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 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 now = Date()
requests.append(now)
requests = requests.filter { $0.timeIntervalSinceNow > -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] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
requests = requests.filter { $0.timeIntervalSinceNow > -timeInterval }
return requests.count <= maxRequests
}
}
// Usage example
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 10)
for _ in 0..<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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let timeSinceLastRequest = lastRequestTime?.timeIntervalSince(currentTime) ?? timeInterval
if timeSinceLastRequest < timeInterval {
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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let timeSinceLastRequest = lastRequestTime?.timeIntervalSince(currentTime) ?? timeInterval
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = currentTime
return true
}
}
// Example usage
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 10.0)
for _ in 0..<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 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 now = Date()
requests.append(now)
// Remove requests that are older than the time interval
requests = requests.filter { $0.timeIntervalSinceNow > -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] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
// Remove requests that are older than the time interval
requests = requests.filter { $0.timeIntervalSinceNow > -timeInterval }
return requests.count <= maxRequests
}
}
// Usage example
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 10)
for _ in 0..<10 {
let allowed = rateLimiter.allowRequest()
print("Request allowed: \(allowed)")
}
```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] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
requests = requests.filter { $0.timeIntervalSinceNow > -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] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
requests = requests.filter { $0.timeIntervalSinceNow > -timeInterval }
return requests.count <= maxRequests
}
}
// Usage example
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 60)
for _ in 0..<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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let timeSinceLastRequest = lastRequestTime?.timeIntervalSince(now) ?? timeInterval
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = now
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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let timeSinceLastRequest = lastRequestTime?.timeIntervalSince(now) ?? timeInterval
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = now
return true
}
}
// Example usage
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 10.0)
for _ in 0..<10 {
if rateLimiter.allowRequest() {
print("Request allowed")
} else {
print("Request denied")
}
}
// Output:
// Request allowed
// Request allowed
// Request allowed
// Request allowed
// Request allowed
// Request denied
// Request denied
// Request denied
// Request denied
// 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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = Date()
return true
}
}
// 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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = Date()
return true
}
}
// 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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = Date()
return true
}
}
// 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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = Date()
return true
}
}
// 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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
lastinit(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'lastRequestTime = Date() // cannot assign to value: 'lastRequestTime' is a 'let' constantThread.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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = currentTime.timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
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 {
let maxRequests: Int
let timeInterval: TimeInterval
var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = currentTime.timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
}
lastRequestTime = currentTime
return true
}
}
// Example usage
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 10.0)
for _ in 1...10 {
if rateLimiter.allowRequest() {
print("Request allowed")
} else {
print("Request not allowed")
}
}
// Output:
// Request allowed
// Request allowed
// Request allowed
// Request allowed
// Request allowed
// Request not allowed
// Request not allowed
// Request not allowed
// Request not allowed
// Request not allowed
```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 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 ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounter
private let lock = NSCountedSet()
init(counter: ThreadSafeCounter) {
self.counter = counter
}
func increment() {
lock.add("lock")
counter.increment()
lock.remove("lock")
}
func currentValue() -> Int {
lock.add("lock")
let value = counter.currentValue()
lock.remove("lock")
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
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Thread-safe wrapper for ThreadSafeCounter.
// Allows to access counter in a thread-safe manner.
class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounter
private let lock = NSCountedSet()
init(counter: ThreadSafeCounter) {
self.counter = counter
}
func increment() {
lock.add("lock")
counter.increment()
lock.remove("lock")
}
func currentValue() -> Int {
lock.add("lock")
let value = counter.currentValue()
lock.remove("lock")
return value
}
}
// Usage
let counter = ThreadSafeCounter(value: 0)
let counterWrapper = ThreadSafeCounterWrapper(counter: counter)
// Increment counter in a thread-safe manner
counterWrapper.increment()
// Access current value in a thread-safe manner
let currentValue = counterWrapper.currentValue()
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper' does not conform to protocol 'ThreadSafeCounterProtocol'protocol 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 ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
private let lock = NSConditionLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
lock.lock()
counter.increment()
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let value = counter.currentValue()
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
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Thread-safe wrapper for basic number counter.
// It is thread-safe for read and write operations.
class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
private let lock = NSConditionLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
lock.lock()
counter.increment()
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let value = counter.currentValue()
lock.unlock()
return value
}
}
let counter = ThreadSafeCounter(value: 0)
let counterWrapper = ThreadSafeCounterWrapper(counter: counter)
// Increment counter in two threads.
let thread1 = DispatchQueue.global()
let thread2 = DispatchQueue.global()
thread1.async {
counterWrapper.increment()
}
thread2.async {
counterWrapper.increment()
}
thread1.sync {
// Do something with counterWrapper.
}
thread2.sync {
// Do something with counterWrapper.
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper' does not conform to protocol 'ThreadSafeCounterProtocol'protocol 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 ThreadSafeCounterWithLock: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
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
}
}
class ThreadSafeCounterWithQueue: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterWithQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
value
}
}
}
class ThreadSafeCounterWithQueueAndLock: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLock")
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
lock.lock()
defer { lock.unlock() }
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
defer { lock.unlock() }
value
}
}
}
class ThreadSafeCounterWithQueueAndLockAndBarrier: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLockAndBarrier")
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
lock.lock()
defer { lock.unlock() }
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
defer { lock.unlock() }
value
}
}
}
class ThreadSafeCounterWithQueueAndLockAndBarrierAndBarrier: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLockAndBarrierAndBarrier")
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
lock.lock()
defer { lock.unlock() }
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
defer { lock.unlock() }
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
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Thread-safe number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithLock: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
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
}
}
// Thread-safe number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithQueue: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterWithQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
value
}
}
}
// Thread-safe number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithQueueAndLock: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLock")
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
lock.lock()
defer { lock.unlock() }
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
defer { lock.unlock() }
value
}
}
}
// Thread-safe number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithQueueAndLockAndBarrier: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLockAndBarrier")
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
lock.lock()
defer { lock.unlock() }
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
defer { lock.unlock() }
value
}
}
}
// Thread-safe number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithQueueAndLockAndBarrierAndBarrier: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLockAndBarrierAndBarrier")
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
lock.lock()
defer { lock.unlock() }
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
defer { lock.unlock() }
value
}
}
}
// Thread-safe number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithQueueAndLockAndBarrierAndBarrierAndBarrier: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLockAndBarrierinit(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 'ThreadSafeCounterWithQueue'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithQueueAndLock'value // property is accessed but result is unusedinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithQueueAndLockAndBarrier'value // property is accessed but result is unusedinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithQueueAndLockAndBarrierAndBarrier'value // property is accessed but result is unusedprotocol 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 ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounter
private let lock = NSLock()
init(counter: ThreadSafeCounter) {
self.counter = counter
}
func increment() {
lock.lock()
counter.increment()
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let value = counter.currentValue()
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
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Thread-safe wrapper for ThreadSafeCounter.
// Provides thread-safe read and write operations.
class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounter
private let lock = NSLock()
init(counter: ThreadSafeCounter) {
self.counter = counter
}
func increment() {
lock.lock()
counter.increment()
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let value = counter.currentValue()
lock.unlock()
return value
}
}
// Usage example
let counter = ThreadSafeCounter(value: 0)
let counterWrapper = ThreadSafeCounterWrapper(counter: counter)
// Increment counter in a separate thread
DispatchQueue.global().async {
counterWrapper.increment()
}
// Access current value in a separate thread
DispatchQueue.global().async {
let value = counterWrapper.currentValue()
print(value)
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper' does not conform to protocol 'ThreadSafeCounterProtocol'protocol 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 ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol
private var lock = NSLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter.currentValue()
}
}
class ReadThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol
private var lock = NSLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter.currentValue()
}
}
class WriteThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol
private var lock = NSLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter.increment()
}
func currentValue() -> Int {
return counter.currentValue()
}
}
class ThreadSafeCounterWrapperWithDispatchOnce: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol?
private var lock = NSLock()
init(value: Int) {
dispatch_once(&counter, {
self.counter = ThreadSafeCounter(value: value)
})
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter!.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter!.currentValue()
}
}
class ReadThreadSafeCounterWrapperWithDispatchOnce: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol?
private var lock = NSLock()
init(value: Int) {
dispatch_once(&counter, {
self.counter = ThreadSafeCounter(value: value)
})
}
func increment() {
counter!.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter!.currentValue()
}
}
class WriteThreadSafeCounterWrapperWithDispatchOnce: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol?
private var lock = NSLock()
init(value: Int) {
dispatch_once(&counter, {
self.counter = ThreadSafeCounter(value: value)
})
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter!.increment()
}
func currentValue() -> Int {
return 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 value: Int
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for read and write operations.
class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol
private var lock = NSLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter.currentValue()
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for read operations.
class ReadThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol
private var lock = NSLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter.currentValue()
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for write operations.
class WriteThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol
private var lock = NSLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter.increment()
}
func currentValue() -> Int {
return counter.currentValue()
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for read and write operations.
// Uses `dispatch_once` to initialize counter only once.
class ThreadSafeCounterWrapperWithDispatchOnce: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol?
private var lock = NSLock()
init(value: Int) {
dispatch_once(&counter, {
self.counter = ThreadSafeCounter(value: value)
})
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter!.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter!.currentValue()
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for read operations.
// Uses `dispatch_once` to initialize counter only once.
class ReadThreadSafeCounterWrapperWithDispatchOnce: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol?
private var lock = NSLock()
init(value: Int) {
dispatch_once(&counter, {
self.counter = ThreadSafeCounter(value: value)
})
}
func increment() {
counter!.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter!.currentValue()
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for write operations.
// Uses `dispatch_once` to initialize counter only once.
class WriteThreadSafeCounterWrapperWithDispatchOnce: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol?
private var lock = NSLock()
init(value: Int) {
dispatch_once(&counter, {
self.counter = ThreadSafeCounter(value: value)
})
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter!.increment()
}
func currentValue() -> Int {
return counter!.currentValue()
}
}
// Thread-safe wrapperinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper' does not conform to protocol 'ThreadSafeCounterProtocol'class ReadThreadSafeCounterWrapper: ThreadSafeCounterProtocol { // type 'ReadThreadSafeCounterWrapper' does not conform to protocol 'ThreadSafeCounterProtocol'class WriteThreadSafeCounterWrapper: ThreadSafeCounterProtocol { // type 'WriteThreadSafeCounterWrapper' does not conform to protocol 'ThreadSafeCounterProtocol'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWrapperWithDispatchOnce'dispatch_once(&counter, { // cannot convert value of type 'UnsafeMutablePointer<(any ThreadSafeCounterProtocol)?>' to expected argument type 'UnsafeMutablePointer<Int>'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ReadThreadSafeCounterWrapperWithDispatchOnce'dispatch_once(&counter, { // cannot convert value of type 'UnsafeMutablePointer<(any ThreadSafeCounterProtocol)?>' to expected argument type 'UnsafeMutablePointer<Int>'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'WriteThreadSafeCounterWrapperWithDispatchOnce'dispatch_once(&counter, { // cannot convert value of type 'UnsafeMutablePointer<(any ThreadSafeCounterProtocol)?>' to expected argument type 'UnsafeMutablePointer<Int>'protocol 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 ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounter
private let lock = NSLock()
init(counter: ThreadSafeCounter) {
self.counter = counter
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return 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 value: Int
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Thread-safe wrapper for ThreadSafeCounter.
// Provides thread-safe access to increment and currentValue methods.
class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounter
private let lock = NSLock()
init(counter: ThreadSafeCounter) {
self.counter = counter
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter.currentValue()
}
}
// Usage example
let counter = ThreadSafeCounter(value: 0)
let counterWrapper = ThreadSafeCounterWrapper(counter: counter)
// Increment the counter in a separate thread
DispatchQueue.global().async {
counterWrapper.increment()
}
// Access the current value in another thread
DispatchQueue.global().async {
let currentValue = counterWrapper.currentValue()
print("Current value: \(currentValue)")
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper' does not conform to protocol 'ThreadSafeCounterProtocol'protocol 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 ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
private let lock = NSLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter.currentValue()
}
}
class ThreadSafeCounterWrapper2: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
private let lock = NSLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter.currentValue()
}
}
class ThreadSafeCounterWrapper3: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
private let lock = NSLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
return counter.currentValue()
}
}
class ThreadSafeCounterWrapper4: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
return counter.currentValue()
}
}
class ThreadSafeCounterWrapper5: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
return counter.currentValue()
}
}
class ThreadSafeCounterWrapper6: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
return counter.currentValue()
}
}
class ThreadSafeCounterWrapper7: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
return counter.currentValue()
}
}
class ThreadSafeCounterWrapper8: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
return 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 value: Int
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for read and write operations.
class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
private let lock = NSLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter.currentValue()
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for read operations.
class ThreadSafeCounterWrapper2: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
private let lock = NSLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter.currentValue()
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for read operations.
class ThreadSafeCounterWrapper3: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
private let lock = NSLock()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
return counter.currentValue()
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for read operations.
class ThreadSafeCounterWrapper4: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
return counter.currentValue()
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for read operations.
class ThreadSafeCounterWrapper5: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
return counter.currentValue()
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for read operations.
class ThreadSafeCounterWrapper6: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
return counter.currentValue()
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for read operations.
class ThreadSafeCounterWrapper7: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
return counter.currentValue()
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for read operations.
class ThreadSafeCounterWrapper8: ThreadSafeCounterProtocol {
private let counter: ThreadSafeCounterProtocol
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
counter.increment()
}
func currentValue() -> Int {
return counter.currentValue()
}
}
// Thread-safe wrapper for basic number counter.
// Thread-safe for read operations.
classinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper' does not conform to protocol 'ThreadSafeCounterProtocol'class ThreadSafeCounterWrapper2: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper2' does not conform to protocol 'ThreadSafeCounterProtocol'class ThreadSafeCounterWrapper3: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper3' does not conform to protocol 'ThreadSafeCounterProtocol'class ThreadSafeCounterWrapper4: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper4' does not conform to protocol 'ThreadSafeCounterProtocol'class ThreadSafeCounterWrapper5: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper5' does not conform to protocol 'ThreadSafeCounterProtocol'class ThreadSafeCounterWrapper6: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper6' does not conform to protocol 'ThreadSafeCounterProtocol'class ThreadSafeCounterWrapper7: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper7' does not conform to protocol 'ThreadSafeCounterProtocol'class ThreadSafeCounterWrapper8: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper8' does not conform to protocol 'ThreadSafeCounterProtocol'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private var lock = NSCountedSet()
init(value: Int) {
self.value = value
}
func increment() {
lock.add("")
value += 1
lock.remove("")
}
func currentValue() -> Int {
lock.add("")
let value = self.value
lock.remove("")
return value
}
}
class NonThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol
private var lock = NSCountedSet()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
lock.add("")
counter.increment()
lock.remove("")
}
func currentValue() -> Int {
lock.add("")
let value = counter.currentValue()
lock.remove("")
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 var lock = NSCountedSet()
init(value: Int) {
self.value = value
}
func increment() {
lock.add("")
value += 1
lock.remove("")
}
func currentValue() -> Int {
lock.add("")
let value = self.value
lock.remove("")
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Not thread-safe for read and write operations.
class NonThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Thread-safe wrapper for non-thread-safe counter.
// Wraps all read and write operations with lock.
class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol {
private var counter: ThreadSafeCounterProtocol
private var lock = NSCountedSet()
init(counter: ThreadSafeCounterProtocol) {
self.counter = counter
}
func increment() {
lock.add("")
counter.increment()
lock.remove("")
}
func currentValue() -> Int {
lock.add("")
let value = counter.currentValue()
lock.remove("")
return value
}
}
let nonThreadSafeCounter = NonThreadSafeCounter(value: 0)
let threadSafeCounter = ThreadSafeCounterWrapper(counter: nonThreadSafeCounter)
// Increment counter in two threads.
// Without lock, the counter value will be incorrect.
let thread1 = DispatchQueue(label: "thread1")
let thread2 = DispatchQueue(label: "thread2")
thread1.async {
for _ in 0..<10000 {
threadSafeCounter.increment()
}
}
thread2.async {
for _ in 0..<10000 {
threadSafeCounter.increment()
}
}
thread1.sync {
thread2.sync {
print("Counter value: \(threadSafeCounter.currentValue())")
}
}
```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 'NonThreadSafeCounter'class ThreadSafeCounterWrapper: ThreadSafeCounterProtocol { // type 'ThreadSafeCounterWrapper' does not conform to protocol 'ThreadSafeCounterProtocol'protocol 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 ThreadSafeCounterWithLock: ThreadSafeCounterProtocol {
private var value: Int
private var lock = NSLock()
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
}
}
class ThreadSafeCounterWithQueue: ThreadSafeCounterProtocol {
private var value: Int
private var queue = DispatchQueue(label: "ThreadSafeCounterWithQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
value
}
}
}
class ThreadSafeCounterWithQueueAndLock: ThreadSafeCounterProtocol {
private var value: Int
private var queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLock")
private var lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
lock.lock()
defer { lock.unlock() }
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
defer { lock.unlock() }
value
}
}
}
class ThreadSafeCounterWithQueueAndLockAndBarrier: ThreadSafeCounterProtocol {
private var value: Int
private var queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLockAndBarrier")
private var lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
lock.lock()
defer { lock.unlock() }
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
defer { lock.unlock() }
value
}
}
}
class ThreadSafeCounterWithQueueAndLockAndBarrierAndBarrier: ThreadSafeCounterProtocol {
private var value: Int
private var queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLockAndBarrierAndBarrier")
private var lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
lock.lock()
defer { lock.unlock() }
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
defer { lock.unlock() }
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
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithLock: ThreadSafeCounterProtocol {
private var value: Int
private var lock = NSLock()
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
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithQueue: ThreadSafeCounterProtocol {
private var value: Int
private var queue = DispatchQueue(label: "ThreadSafeCounterWithQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
value
}
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithQueueAndLock: ThreadSafeCounterProtocol {
private var value: Int
private var queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLock")
private var lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
lock.lock()
defer { lock.unlock() }
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
defer { lock.unlock() }
value
}
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithQueueAndLockAndBarrier: ThreadSafeCounterProtocol {
private var value: Int
private var queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLockAndBarrier")
private var lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
lock.lock()
defer { lock.unlock() }
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
defer { lock.unlock() }
value
}
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithQueueAndLockAndBarrierAndBarrier: ThreadSafeCounterProtocol {
private var value: Int
private var queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLockAndBarrierAndBarrier")
private var lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
lock.lock()
defer { lock.unlock() }
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
defer { lock.unlock() }
value
}
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithQueueAndLockAndBarrierAndBarrierAndBarrier: ThreadSafeCounterProtocol {
private var value: Int
private var queue = DispatchQueue(label: "ThreadSafeCounterWithQueueAndLockAndBarrierAndBarrierAndBarrier")
private varinit(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 'ThreadSafeCounterWithQueue'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithQueueAndLock'value // property is accessed but result is unusedinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithQueueAndLockAndBarrier'value // property is accessed but result is unusedinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithQueueAndLockAndBarrierAndBarrier'value // property is accessed but result is unusedprotocol 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 ThreadSafeCounterWithQueue: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterWithQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
value
}
}
}
class ThreadSafeCounterWithAtomic: ThreadSafeCounterProtocol {
private var value: Atomic<Int>
init(value: Int) {
self.value = Atomic(value)
}
func increment() {
value.modify { $0 + 1 }
}
func currentValue() -> Int {
return value.get()
}
}
class ThreadSafeCounterWithAtomicAndQueue: ThreadSafeCounterProtocol {
private var value: Atomic<Int>
private let queue = DispatchQueue(label: "ThreadSafeCounterWithAtomicAndQueue")
init(value: Int) {
self.value = Atomic(value)
}
func increment() {
queue.sync {
value.modify { $0 + 1 }
}
}
func currentValue() -> Int {
return queue.sync {
value.get()
}
}
}
class ThreadSafeCounterWithAtomicAndQueueAndLock: ThreadSafeCounterProtocol {
private var value: Atomic<Int>
private let queue = DispatchQueue(label: "ThreadSafeCounterWithAtomicAndQueueAndLock")
private let lock = NSLock()
init(value: Int) {
self.value = Atomic(value)
}
func increment() {
queue.sync {
lock.lock()
value.modify { $0 + 1 }
lock.unlock()
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
let result = value.get()
lock.unlock()
return result
}
}
}
class ThreadSafeCounterWithAtomicAndQueueAndLockAndSemaphore: ThreadSafeCounterProtocol {
private var value: Atomic<Int>
private let queue = DispatchQueue(label: "ThreadSafeCounterWithAtomicAndQueueAndLockAndSemaphore")
private let lock = NSLock()
private let semaphore = DispatchSemaphore(value: 1)
init(value: Int) {
self.value = Atomic(value)
}
func increment() {
queue.sync {
lock.lock()
value.modify { $0 + 1 }
lock.unlock()
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
let result = value.get()
lock.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 value: Int
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Thread-safe number counter with possibility to increment counter and access current value.
// Uses `DispatchQueue` to provide thread-safe access to counter.
class ThreadSafeCounterWithQueue: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterWithQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
value
}
}
}
// Thread-safe number counter with possibility to increment counter and access current value.
// Uses `Atomic` to provide thread-safe access to counter.
class ThreadSafeCounterWithAtomic: ThreadSafeCounterProtocol {
private var value: Atomic<Int>
init(value: Int) {
self.value = Atomic(value)
}
func increment() {
value.modify { $0 + 1 }
}
func currentValue() -> Int {
return value.get()
}
}
// Thread-safe number counter with possibility to increment counter and access current value.
// Uses `Atomic` to provide thread-safe access to counter.
// Uses `Atomic` to provide thread-safe access to counter.
class ThreadSafeCounterWithAtomicAndQueue: ThreadSafeCounterProtocol {
private var value: Atomic<Int>
private let queue = DispatchQueue(label: "ThreadSafeCounterWithAtomicAndQueue")
init(value: Int) {
self.value = Atomic(value)
}
func increment() {
queue.sync {
value.modify { $0 + 1 }
}
}
func currentValue() -> Int {
return queue.sync {
value.get()
}
}
}
// Thread-safe number counter with possibility to increment counter and access current value.
// Uses `Atomic` to provide thread-safe access to counter.
// Uses `Atomic` to provide thread-safe access to counter.
class ThreadSafeCounterWithAtomicAndQueueAndLock: ThreadSafeCounterProtocol {
private var value: Atomic<Int>
private let queue = DispatchQueue(label: "ThreadSafeCounterWithAtomicAndQueueAndLock")
private let lock = NSLock()
init(value: Int) {
self.value = Atomic(value)
}
func increment() {
queue.sync {
lock.lock()
value.modify { $0 + 1 }
lock.unlock()
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
let result = value.get()
lock.unlock()
return result
}
}
}
// Thread-safe number counter with possibility to increment counter and access current value.
// Uses `Atomic` to provide thread-safe access to counter.
// Uses `Atomic` to provide thread-safe access to counter.
class ThreadSafeCounterWithAtomicAndQueueAndLockAndSemaphore: ThreadSafeCounterProtocol {
private var value: Atomic<Int>
private let queue = DispatchQueue(label: "ThreadSafeCounterWithAtomicAndQueueAndLockAndSemaphore")
private let lock = NSLock()
private let semaphore = DispatchSemaphore(value: 1)
init(value: Int) {
self.value = Atomic(value)
}
func increment() {
queue.sync {
lock.lock()
value.modify { $0 + 1 }
lock.unlock()
}
}
func currentValue() -> Int {
return queue.sync {
lock.lock()
let result = value.get()
lock.unlock()
return result
}
}
}
//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 'ThreadSafeCounterWithQueue'private var value: Atomic<Int> // cannot find type 'Atomic' in scopeinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithAtomic'self.value = Atomic(value) // cannot find 'Atomic' in scopeprivate var value: Atomic<Int> // cannot find type 'Atomic' in scopeinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithAtomicAndQueue'self.value = Atomic(value) // cannot find 'Atomic' in scopeprivate var value: Atomic<Int> // cannot find type 'Atomic' in scopeinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithAtomicAndQueueAndLock'self.value = Atomic(value) // cannot find 'Atomic' in scopeprivate var value: Atomic<Int> // cannot find type 'Atomic' in scopeinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithAtomicAndQueueAndLockAndSemaphore'self.value = Atomic(value) // cannot find 'Atomic' 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 let value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(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 {
private let value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage:
let pipeline = Pipeline(value: 1)
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { String($0) }
.execute()
print(pipeline) // Output: "4"
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'Output'return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<Output>' to return type 'Pipeline<U>'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
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(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 {
private let value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe(transform: { $0 + 1 })
.pipe(transform: { $0 * 2 })
.pipe(transform: { String($0) })
.execute()
print(pipeline) // Output: "4"
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'Output'return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<Output>' to return type 'Pipeline<U>'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
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(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 {
private let value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Usage example
let pipeline = Pipeline(value: 1)
.pipe(transform: { $0 + 1 })
.pipe(transform: { $0 * 2 })
.pipe(transform: { String($0) })
.execute()
print(pipeline) // Output: "4"
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'Output'return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<Output>' to return type 'Pipeline<U>'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 let transforms: [AnyFunction]
init(value: Output) {
self.value = value
self.transforms = []
}
private init(value: Output, transforms: [AnyFunction]) {
self.value = value
self.transforms = transforms
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: value, transforms: transforms + [AnyFunction(transform)])
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform.apply(result)
}
return result
}
}
struct AnyFunction<Output> {
let apply: (Output) -> Output
init<U>(_ transform: @escaping (Output) -> U) {
self.apply = { input in
let result = transform(input)
return result as! Output
}
}
}```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 let transforms: [AnyFunction]
init(value: Output) {
self.value = value
self.transforms = []
}
private init(value: Output, transforms: [AnyFunction]) {
self.value = value
self.transforms = transforms
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: value, transforms: transforms + [AnyFunction(transform)])
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform.apply(result)
}
return result
}
}
// AnyFunction is a generic type that represents a function with any return type.
// It uses associatedtype to define the return type of the function.
struct AnyFunction<Output> {
let apply: (Output) -> Output
init<U>(_ transform: @escaping (Output) -> U) {
self.apply = { input in
let result = transform(input)
return result as! Output
}
}
}
// Usage example
let pipeline = Pipeline(value: 1)
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { String($0) }
let result = pipeline.execute()
print(result) // Output: "4"
```private let transforms: [AnyFunction] // reference to generic type 'AnyFunction' requires arguments in <...>init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'private init(value: Output, transforms: [AnyFunction]) { // reference to generic type 'AnyFunction' requires arguments in <...>return Pipeline(value: value, transforms: transforms + [AnyFunction(transform)]) // extra argument 'transforms' in callreturn Pipeline(value: value, transforms: transforms + [AnyFunction(transform)]) // cannot convert return expression of type 'Pipeline<Output>' to return type 'Pipeline<U>'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
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(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 {
private let value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0.description }
.execute()
print(pipeline) // Output: "4"
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'Output'return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<Output>' to return type 'Pipeline<U>'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
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(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 {
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0.description }
.execute()
print(pipeline) // Output: "4"
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'Output'return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<Output>' to return type 'Pipeline<U>'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
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(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 {
private let value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage:
let pipeline = Pipeline(value: 1)
.pipe { $0 + 1 }
.pipe { String($0) }
.pipe { $0.uppercased() }
.execute()
print(pipeline) // Output: "2"
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'Output'return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<Output>' to return type 'Pipeline<U>'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 let transforms: [AnyFunction]
init(value: Output) {
self.value = value
self.transforms = []
}
private init(value: Output, transforms: [AnyFunction]) {
self.value = value
self.transforms = transforms
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: value, transforms: transforms + [AnyFunction(transform)])
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform.apply(result)
}
return result
}
}
protocol AnyFunctionProtocol {
associatedtype Input
associatedtype Output
func apply(_ input: Input) -> Output
}
struct AnyFunction<Input, Output>: AnyFunctionProtocol {
let closure: (Input) -> Output
init(_ closure: @escaping (Input) -> Output) {
self.closure = closure
}
func apply(_ input: Input) -> Output {
return closure(input)
}
}```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 let transforms: [AnyFunction]
init(value: Output) {
self.value = value
self.transforms = []
}
private init(value: Output, transforms: [AnyFunction]) {
self.value = value
self.transforms = transforms
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: value, transforms: transforms + [AnyFunction(transform)])
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform.apply(result)
}
return result
}
}
// AnyFunction is a generic type that represents a function with any return type.
// It uses the AnyFunctionProtocol protocol to define a single method, apply, which takes an input of type Input and returns a value of type Output.
// The AnyFunction struct is a generic struct that conforms to the AnyFunctionProtocol protocol and stores a closure of type (Input) -> Output.
// The apply method simply calls the stored closure with the given input and returns the result.
// This allows us to store any function with any return type in an array of AnyFunction objects.
// The AnyFunctionProtocol protocol is used to ensure that the AnyFunction struct conforms to the protocol and implements the apply method.
protocol AnyFunctionProtocol {
associatedtype Input
associatedtype Output
func apply(_ input: Input) -> Output
}
struct AnyFunction<Input, Output>: AnyFunctionProtocol {
let closure: (Input) -> Output
init(_ closure: @escaping (Input) -> Output) {
self.closure = closure
}
func apply(_ input: Input) -> Output {
return closure(input)
}
}
// Usage example
let pipeline = Pipeline(value: 1)
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { String($0) }
.pipe { $0.uppercased() }
let result = pipeline.execute()
print(result) // Output: "4"
```private let transforms: [AnyFunction] // reference to generic type 'AnyFunction' requires arguments in <...>init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'private init(value: Output, transforms: [AnyFunction]) { // reference to generic type 'AnyFunction' requires arguments in <...>return Pipeline(value: value, transforms: transforms + [AnyFunction(transform)]) // extra argument 'transforms' in callreturn Pipeline(value: value, transforms: transforms + [AnyFunction(transform)]) // cannot convert return expression of type 'Pipeline<Output>' to return type 'Pipeline<U>'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
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(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 {
private let value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { String($0) }
.execute()
print(pipeline) // Output: "4"
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'Output'return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<Output>' to return type 'Pipeline<U>'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
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(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 {
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { String($0) }
.execute()
print(pipeline) // Output: "4"
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'Output'return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<Output>' to return type 'Pipeline<U>'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.removeValue(forKey: observer)
}
func notify() {
observers.values.forEach { $0(value) }
}
}
class BindableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}```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.removeValue(forKey: observer)
}
func notify() {
observers.values.forEach { $0(value) }
}
}
// A property that can be bound to other properties.
class BindableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// A property that can be bound to other properties.
class BindableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// A property that can be bound to other properties.
class BindableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// A property that can be bound to other properties.
class BindableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// A property that can be bound to other properties.
class BindableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// A property that can be bound to other properties.
class BindableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}init(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 {
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.removeValue(forKey: observer)
}
}
class Observable<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.removeValue(forKey: observer)
}
// Set the value and notify observers.
func setValue(_ value: Value) {
self.value = value
for observer in observers.values {
observer(value)
}
}
}
class MutableObservable<Value> : Observable<Value> {
func setValue(_ value: Value) {
super.setValue(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.removeValue(forKey: observer)
}
}
// A property that can be observed for changes.
class Observable<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.removeValue(forKey: observer)
}
// Set the value and notify observers.
func setValue(_ value: Value) {
self.value = value
for observer in observers.values {
observer(value)
}
}
}
// A property that can be observed for changes and can be set.
class MutableObservable<Value> : Observable<Value> {
func setValue(_ value: Value) {
super.setValue(value)
}
}
// A property that can be observed for changes and can be set.
class MutableObservable<Value> : Observable<Value> {
func setValue(_ value: Value) {
super.setValue(value)
}
}
// A property that can be observed for changes and can be set.
class MutableObservable<Value> : Observable<Value> {
func setValue(_ value: Value) {
super.setValue(value)
}
}
// A property that can be observed for changes and can be set.
class MutableObservable<Value> : Observable<Value> {
func setValue(_ value: Value) {
super.setValue(value)
}
}
// A property that can be observed for changes and can be set.
class MutableObservable<Value> : Observable<Value> {
func setValue(_ value: Value) {
super.setValue(value)
}
}
// A property that can be observed for changes and can be set.
class MutableObservable<Value> : Observable<Value> {
func setValue(_ value: Value) {
super.setValue(value)
}
}
// A property that can be observed for changes and can be set.
class MutableObservable<Value> : Observable<Value> {
func setValue(_ value: Value) {
super.setValue(value)
}
}
// A property that can be observed for changes and can be set.
class MutableObservable<Value> : Observable<Value> {
func setValue(_ value: Value) {
super.setValue(value)
}
}
// A property that can be observed for changes and can be set.
class MutableObservable<Value> : Observable<Value> {
func setValue(_ value: Value) {
super.setValue(value)
}
}
// A property that can be observed for changes and can be set.
class MutableObservable<Value> : Observable<Value> {
func setValue(_ value: Value) {
super.setValue(value)
}
}
// A property that can be observed for changes and can be set.
class MutableObservable<Value> : Observable<Value> {
func setValue(_ value: Value) {
super.setValue(value)
}
}
// A property that can be observed for changes and can be set.
class MutableObservable<Value> : Observable<Value> {
func setValue(_ value: Value) {
super.setValue(value)
}
}
// A property that can be observed for changes and can beinit(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 'Observable<Value>'func setValue(_ value: Value) { // overriding declaration requires an 'override' keywordprotocol 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.removeValue(forKey: observer)
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
class Observable<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
class Mutable<Value> : Observable<Value> {
override init(value: Value) {
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
class Computed<Value> : Observable<Value> {
override init(value: Value) {
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
class ComputedMutable<Value> : Observable<Value> {
override init(value: Value) {
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}```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.removeValue(forKey: observer)
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
// A property that can be observed for changes.
class Observable<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// A property that can be observed for changes, and can be set externally.
class Mutable<Value> : Observable<Value> {
override init(value: Value) {
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// A property that can be observed for changes, and can be set externally.
class Computed<Value> : Observable<Value> {
override init(value: Value) {
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// A property that can be observed for changes, and can be set externally.
class ComputedMutable<Value> : Observable<Value> {
override init(value: Value) {
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// A property that can be observed for changes, and can be set externally.
class ComputedMutable<Value> : Observable<Value> {
override init(value: Value) {
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// A property that can be observed for changes, and can be set externally.
class ComputedMutable<Value> : Observable<Value> {
override init(value: Value) {
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// A property that can be observed for changes, and can be set externally.
class ComputedMutable<Value> : Observable<Value> {
override init(value: Value) {
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// A property that can be observed for changes, and can be set externally.
class ComputedMutable<Value> : Observable<Value> {
override init(value: Value) {
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// A property that can be observed for changes, and can be set externally.
class ComputedMutable<Value> : Observable<Value> {
override init(value: Value) {
super.init(value: value)init(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]()
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.removeValue(forKey: observer)
}
}
class Observable<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var property = ObservableProperty<Value>(value: Value())
var value: Value {
get {
return property.value
}
set {
property.value = newValue
property.observers.values.forEach { $0(newValue) }
}
}
init(value: Value) {
property.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return property.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
property.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 {
typealias Value = Value
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.removeValue(forKey: observer)
}
}
// A property that can be observed for changes.
class Observable<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var property = ObservableProperty<Value>(value: Value())
var value: Value {
get {
return property.value
}
set {
property.value = newValue
property.observers.values.forEach { $0(newValue) }
}
}
init(value: Value) {
property.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return property.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
property.unsubscribe(observer)
}
}
// A property that can be observed for changes.
class Observable<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var property = ObservableProperty<Value>(value: Value())
var value: Value {
get {
return property.value
}
set {
property.value = newValue
property.observers.values.forEach { $0(newValue) }
}
}
init(value: Value) {
property.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return property.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
property.unsubscribe(observer)
}
}
// A property that can be observed for changes.
class Observable<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var property = ObservableProperty<Value>(value: Value())
var value: Value {
get {
return property.value
}
set {
property.value = newValue
property.observers.values.forEach { $0(newValue) }
}
}
init(value: Value) {
property.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return property.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
property.unsubscribe(observer)
}
}
// A property that can be observed for changes.
class Observable<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var property = ObservableProperty<Value>(value: Value())
var value: Value {
get {
return property.value
}
set {
property.value = newValue
property.observers.values.forEach { $0(newValue) }
}
}
init(value: Value) {
property.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return property.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
property.unsubscribe(observer)
}
}
// A property that can be observed for changes.
class Observable<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var property = ObservableProperty<Value>(value: Value())
var value: Value {
get {
return property.value
}
set {
property.value = newValue
property.observers.values.forEach { $0(newValue) }
}
}
init(value: Value) {
property.value = value
init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'private var property = ObservableProperty<Value>(value: Value()) // type 'Value' has no member 'init'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Observable<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 uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
class BindableProperty<Value> : ObservableProperty<Value> {
private var binding: ((Value) -> Void)?
func bind(_ property: ObservablePropertyProtocol & BindablePropertyProtocol) {
binding = property.subscribe { value in
self.value = value
}
}
func unbind() {
binding?.unsubscribe()
binding = nil
}
}
class BindableObservableProperty<Value> : ObservableProperty<Value> {
private var binding: ((Value) -> Void)?
func bind(_ property: ObservablePropertyProtocol & BindableObservablePropertyProtocol) {
binding = property.subscribe { value in
self.value = value
}
}
func unbind() {
binding?.unsubscribe()
binding = 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 {
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.removeValue(forKey: observer)
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
// Observable property that can be bound to other observable properties.
class BindableProperty<Value> : ObservableProperty<Value> {
private var binding: ((Value) -> Void)?
func bind(_ property: ObservablePropertyProtocol & BindablePropertyProtocol) {
binding = property.subscribe { value in
self.value = value
}
}
func unbind() {
binding?.unsubscribe()
binding = nil
}
}
// Observable property that can be bound to other observable properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
private var binding: ((Value) -> Void)?
func bind(_ property: ObservablePropertyProtocol & BindableObservablePropertyProtocol) {
binding = property.subscribe { value in
self.value = value
}
}
func unbind() {
binding?.unsubscribe()
binding = nil
}
}
// Observable property that can be bound to other observable properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
private var binding: ((Value) -> Void)?
func bind(_ property: ObservablePropertyProtocol & BindableObservablePropertyProtocol) {
binding = property.subscribe { value in
self.value = value
}
}
func unbind() {
binding?.unsubscribe()
binding = nil
}
}
// Observable property that can be bound to other observable properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
private var binding: ((Value) -> Void)?
func bind(_ property: ObservablePropertyProtocol & BindableObservablePropertyProtocol) {
binding = property.subscribe { value in
self.value = value
}
}
func unbind() {
binding?.unsubscribe()
binding = nil
}
}
// Observable property that can be bound to other observable properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
private var binding: ((Value) -> Void)?
func bind(_ property: ObservablePropertyProtocol & BindableObservablePropertyProtocol) {
binding = property.subscribe { value in
self.value = value
}
}
func unbind() {
binding?.unsubscribe()
binding = nil
}
}
// Observable property that can be bound to other observable properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
private var binding: ((Value) -> Void)?
func bind(_ property: ObservablePropertyProtocol & BindableObservablePropertyProtocol) {
binding = property.subscribe { value in
self.value = value
}
}
func unbind() {
binding?.unsubscribe()
binding = nil
}
}
// Observable property that can be bound to other observable properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
private var binding: ((Value) -> Void)?
func bind(_ property: ObservablePropertyProtocol & BindableObservablePropertyProtocol) {
binding = property.subscribe { value in
self.value = value
}
}
func unbind() {
binding?.unsubscribe()
binding = nil
}
}
// Observable property that can be bound to other observable properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
private var binding: ((Value) -> Void)?
func bind(_ propertyinit(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'func bind(_ property: ObservablePropertyProtocol & BindablePropertyProtocol) { // cannot find type 'BindablePropertyProtocol' in scopebinding?.unsubscribe() // value of type '(Value) -> Void' has no member 'unsubscribe'func bind(_ property: ObservablePropertyProtocol & BindableObservablePropertyProtocol) { // cannot find type 'BindableObservablePropertyProtocol' in scopebinding?.unsubscribe() // value of type '(Value) -> Void' has no member 'unsubscribe'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.removeValue(forKey: observer)
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
class Observable<Object, Value> : ObservablePropertyProtocol {
let object: Object
let get: (Object) -> Value
let set: (Object, Value) -> Void
let property: ObservableProperty<Value>
init(object: Object, get: @escaping (Object) -> Value, set: @escaping (Object, Value) -> Void) {
self.object = object
self.get = get
self.set = set
self.property = ObservableProperty(value: get(object))
}
var value: Value {
get {
return property.value
}
set {
set(object, newValue)
property.value = newValue
property.notify()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return property.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
property.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 {
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.removeValue(forKey: observer)
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
// Observable property that wraps a property of an object.
class Observable<Object, Value> : ObservablePropertyProtocol {
let object: Object
let get: (Object) -> Value
let set: (Object, Value) -> Void
let property: ObservableProperty<Value>
init(object: Object, get: @escaping (Object) -> Value, set: @escaping (Object, Value) -> Void) {
self.object = object
self.get = get
self.set = set
self.property = ObservableProperty(value: get(object))
}
var value: Value {
get {
return property.value
}
set {
set(object, newValue)
property.value = newValue
property.notify()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return property.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
property.unsubscribe(observer)
}
}
// Observable property that wraps a property of an object.
class Observable<Object, Value> : ObservablePropertyProtocol {
let object: Object
let get: (Object) -> Value
let set: (Object, Value) -> Void
let property: ObservableProperty<Value>
init(object: Object, get: @escaping (Object) -> Value, set: @escaping (Object, Value) -> Void) {
self.object = object
self.get = get
self.set = set
self.property = ObservableProperty(value: get(object))
}
var value: Value {
get {
return property.value
}
set {
set(object, newValue)
property.value = newValue
property.notify()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return property.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
property.unsubscribe(observer)
}
}
// Observable property that wraps a property of an object.
class Observable<Object, Value> : ObservablePropertyProtocol {
let object: Object
let get: (Object) -> Value
let set: (Object, Value) -> Void
let property: ObservableProperty<Value>
init(object: Object, get: @escaping (Object) -> Value, set: @escaping (Object, Value) -> Void) {
self.object = object
self.get = get
self.set = set
self.property = ObservableProperty(value: get(object))
}
var value: Value {
get {
return property.value
}
set {
set(object, newValue)
property.value = newValue
property.notify()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return property.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
property.unsubscribe(observer)
}
}
// Observable property that wraps a property of an object.
class Observable<Object, Value> : ObservablePropertyProtocol {
let object: Object
let get: (Object) -> Value
let set: (Object, Value) -> Void
let property: ObservableProperty<Value>
init(object: Object,init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'class Observable<Object, Value> : ObservablePropertyProtocol { // type 'Observable<Object, 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 {
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.removeValue(forKey: observer)
}
func notify() {
observers.values.forEach { $0(value) }
}
}
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}```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.removeValue(forKey: observer)
}
func notify() {
observers.values.forEach { $0(value) }
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
init(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 {
var 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.removeValue(forKey: observer)
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}```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]()
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.removeValue(forKey: observer)
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
}
}
// Observable property that notifies observers of value changes.
class Observable<Value> : ObservableProperty<Value> {
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = super.subscribe(observer)
observer(value)
return id
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
notify()
}
} // XCTAssertEqual failed: (nil) is not equal to (Optional(10))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.removeValue(forKey: observer)
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
class BindableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
func bind(_ other: ObservableProperty<Value>) {
other.subscribe { [weak self] value in
self?.value = value
}
}
}
class BindableObservableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
func bind(_ other: ObservableProperty<Value>) {
other.subscribe { [weak self] value in
self?.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 id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
// A property that can be bound to other properties.
class BindableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
func bind(_ other: ObservableProperty<Value>) {
other.subscribe { [weak self] value in
self?.value = value
}
}
}
// A property that can be bound to other properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
func bind(_ other: ObservableProperty<Value>) {
other.subscribe { [weak self] value in
self?.value = value
}
}
}
// A property that can be bound to other properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
func bind(_ other: ObservableProperty<Value>) {
other.subscribe { [weak self] value in
self?.value = value
}
}
}
// A property that can be bound to other properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
func bind(_ other: ObservableProperty<Value>) {
other.subscribe { [weak self] value in
self?.value = value
}
}
}
// A property that can be bound to other properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
func bind(_ other: ObservableProperty<Value>) {
other.subscribe { [weak self] value in
self?.value = value
}
}
}
// A property that can be bound to other properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
func bind(_ other: ObservableProperty<Value>) {
other.subscribe { [weak self] value in
self?.value = value
}
}
}
// A property that can be bound to other properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
func bind(_ other: ObservableProperty<Value>) {
other.subscribe { [weak self] value in
self?.value = value
}
}
}
// A property that can be bound to other properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
func bind(_ other: ObservableProperty<Value>) {
other.subscribe { [weak self] value in
self?.value = value
}
}
}
// A property that can be bound to other properties.
class BindableObservableProperty<Value> : ObservableProperty<Value> {
override init(value: Value) {
super.init(value: value)
}
func bind(_ other: ObservableProperty<Value>) {
other.subscribe { [weak self] value in
self?.value = value
}
}
}init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'other.subscribe { [weak self] value in // result of call to 'subscribe' is unusedother.subscribe { [weak self] value in // result of call to 'subscribe' is unusedprotocol 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.removeValue(forKey: observer)
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
class BindableProperty<Value> : ObservableProperty<Value> {
var binding: ((Value) -> Void)?
override init(value: Value) {
super.init(value: value)
binding = nil
}
func bind(_ binding: @escaping (Value) -> Void) {
self.binding = binding
binding(value)
}
override func notify() {
super.notify()
binding?(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.removeValue(forKey: observer)
}
func notify() {
for observer in observers.values {
observer(value)
}
}
}
// An observable property that can be bound to a UI element.
class BindableProperty<Value> : ObservableProperty<Value> {
var binding: ((Value) -> Void)?
override init(value: Value) {
super.init(value: value)
binding = nil
}
func bind(_ binding: @escaping (Value) -> Void) {
self.binding = binding
binding(value)
}
override func notify() {
super.notify()
binding?(value)
}
}
// An observable property that can be bound to a UI element.
class BindableProperty<Value> : ObservableProperty<Value> {
var binding: ((Value) -> Void)?
override init(value: Value) {
super.init(value: value)
binding = nil
}
func bind(_ binding: @escaping (Value) -> Void) {
self.binding = binding
binding(value)
}
override func notify() {
super.notify()
binding?(value)
}
}
// An observable property that can be bound to a UI element.
class BindableProperty<Value> : ObservableProperty<Value> {
var binding: ((Value) -> Void)?
override init(value: Value) {
super.init(value: value)
binding = nil
}
func bind(_ binding: @escaping (Value) -> Void) {
self.binding = binding
binding(value)
}
override func notify() {
super.notify()
binding?(value)
}
}
// An observable property that can be bound to a UI element.
class BindableProperty<Value> : ObservableProperty<Value> {
var binding: ((Value) -> Void)?
override init(value: Value) {
super.init(value: value)
binding = nil
}
func bind(_ binding: @escaping (Value) -> Void) {
self.binding = binding
binding(value)
}
override func notify() {
super.notify()
binding?(value)
}
}
// An observable property that can be bound to a UI element.
class BindableProperty<Value> : ObservableProperty<Value> {
var binding: ((Value) -> Void)?
override init(value: Value) {
super.init(value: value)
binding = nil
}
func bind(_ binding: @escaping (Value) -> Void) {
self.binding = binding
binding(value)
}
override func notify() {
super.notify()
binding?(value)
}
}
// An observable property that can be bound to a UI element.
class BindableProperty<Value> : ObservableProperty<Value> {
var binding: ((Value) -> Void)?
override init(value: Value) {
super.init(value: value)
binding = nil
}
func bind(_ binding: @escaping (Value) -> Void) {
self.binding = binding
binding(value)
}
override func notify() {
super.notify()
binding?(value)
}
}
// An observable property that can be bound to a UI element.
class BindableProperty<Value> : ObservableProperty<Value> {
var binding: ((Value) -> Void)?
override init(init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}```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> {
private var wrappedValue: Value
private let range: ClosedRange<Value>
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: Range<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range.clamped
}
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: HalfOpenRange<Value>) {
self.wrappedValue = range@Clamped(0...10) var value: Int = 0 // unknown attribute 'Clamped'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var range: ClosedRange<Value>
private var value: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = range.clamp(wrappedValue)
}
public var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
struct ClampedInt: ClampedProtocol {
@Clamped(0...10) var value: Int
init(wrappedValue: Int, _ range: ClosedRange<Int>) {
self.value = wrappedValue
}
}```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> {
private var range: ClosedRange<Value>
private var value: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = range.clamp(wrappedValue)
}
public var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
struct ClampedInt: ClampedProtocol {
@Clamped(0...10) var value: Int
init(wrappedValue: Int, _ range: ClosedRange<Int>) {
self.value = wrappedValue
}
}
```self.value = range.clamp(wrappedValue) // value of type 'ClosedRange<Value>' has no member 'clamp'set { value = range.clamp(newValue) } // value of type 'ClosedRange<Value>' has no member 'clamp'@Clamped(0...10) 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> {
private var range: ClosedRange<Value>
private var value: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = range.clamp(wrappedValue)
}
public var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
extension Clamped: ClampedProtocol {}
// MARK: - ClosedRange
extension ClosedRange where Bound: Comparable {
/// Returns the value clamped to the range.
///
/// - Parameter value: The value to clamp.
/// - Returns: The value clamped to the range.
public func clamp(_ value: Bound) -> Bound {
return min(max(lowerBound, value), upperBound)
}
}
struct Example {
@Clamped(0...100) var progress: 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> {
private var range: ClosedRange<Value>
private var value: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = range.clamp(wrappedValue)
}
public var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
// MARK: - ClampedProtocol
extension Clamped: ClampedProtocol {}
// MARK: - ClosedRange
extension ClosedRange where Bound: Comparable {
/// Returns the value clamped to the range.
///
/// - Parameter value: The value to clamp.
/// - Returns: The value clamped to the range.
public func clamp(_ value: Bound) -> Bound {
return min(max(lowerBound, value), upperBound)
}
}
// MARK: - Example
struct Example {
@Clamped(0...100) var progress: Int
}
```return min(max(lowerBound, value), 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 conformancereturn min(max(lowerBound, value), 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 conformance@Clamped(0...100) var progress: Int // missing argument for parameter 'wrappedValue' in callprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var range: ClosedRange<Value>
private var wrappedValue: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.wrappedValue = range.clamp(wrappedValue)
}
public var value: Value {
get { wrappedValue }
set { wrappedValue = range.clamp(newValue) }
}
}
struct ClampedInt: ClampedProtocol {
typealias Value = Int
@Clamped(0...100) var value: Value
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
}
}```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> {
private var range: ClosedRange<Value>
private var wrappedValue: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.wrappedValue = range.clamp(wrappedValue)
}
public var value: Value {
get { wrappedValue }
set { wrappedValue = range.clamp(newValue) }
}
}
// A struct that conforms to ClampedProtocol.
struct ClampedInt: ClampedProtocol {
typealias Value = Int
@Clamped(0...100) var value: Value
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
}
}
let clampedInt = ClampedInt(wrappedValue: 105)
print(clampedInt.value) // Prints "100"
clampedInt.value = -100
print(clampedInt.value) // Prints "0"
```private var wrappedValue: Value // private property 'wrappedValue' cannot have more restrictive access than its enclosing property wrapper type 'Clamped' (which is internal)self.wrappedValue = range.clamp(wrappedValue) // value of type 'ClosedRange<Value>' has no member 'clamp'set { wrappedValue = range.clamp(newValue) } // value of type 'ClosedRange<Value>' has no member 'clamp'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var range: ClosedRange<Value>
private var value: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = range.clamp(wrappedValue)
}
public var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
extension Clamped: ClampedProtocol {}
// MARK: - ClosedRange
extension ClosedRange where Bound: Comparable {
/// Clamps a value within the range.
///
/// - Parameter value: The value to clamp.
/// - Returns: The clamped value.
public func clamp(_ value: Bound) -> Bound {
return min(max(lowerBound, value), 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> {
private var range: ClosedRange<Value>
private var value: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = range.clamp(wrappedValue)
}
public var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
// MARK: - ClampedProtocol
extension Clamped: ClampedProtocol {}
// MARK: - ClosedRange
extension ClosedRange where Bound: Comparable {
/// Clamps a value within the range.
///
/// - Parameter value: The value to clamp.
/// - Returns: The clamped value.
public func clamp(_ value: Bound) -> Bound {
return min(max(lowerBound, value), upperBound)
}
}
```return min(max(lowerBound, value), 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 conformancereturn min(max(lowerBound, value), 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> {
private var range: ClosedRange<Value>
private var value: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = range.clamp(wrappedValue)
}
public var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
extension Clamped: ClampedProtocol {}
// MARK: - ClosedRange
extension ClosedRange where Bound: Comparable {
/// Clamps a value within the range.
///
/// - Parameter value: The value to clamp.
/// - Returns: The clamped value.
public func clamp(_ value: Bound) -> Bound {
if value < lowerBound { return lowerBound }
if value > upperBound { return upperBound }
return value
}
}```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> {
private var range: ClosedRange<Value>
private var value: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = range.clamp(wrappedValue)
}
public var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
// MARK: - ClampedProtocol
extension Clamped: ClampedProtocol {}
// MARK: - ClosedRange
extension ClosedRange where Bound: Comparable {
/// Clamps a value within the range.
///
/// - Parameter value: The value to clamp.
/// - Returns: The clamped value.
public func clamp(_ value: Bound) -> Bound {
if value < lowerBound { return lowerBound }
if value > upperBound { return upperBound }
return value
}
}
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = range.clamp(wrappedValue)
self.range = range
}
// Getter that returns the clamped value.
var wrappedValue: Value {
get {
return value
}
set {
value = range.clamp(newValue)
}
}
// Getter that returns the range.
var projectedValue: ClosedRange<Value> {
return range
}
}
struct ClampedInt: ClampedProtocol {
@Clamped(0...100) var value: Int
init(wrappedValue: Int, _ range: ClosedRange<Int>) {
self.value = range.clamp(wrappedValue)
}
}```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> {
private var value: Value
private let range: ClosedRange<Value>
// Initializer that takes a value and a range.
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = range.clamp(wrappedValue)
self.range = range
}
// Getter that returns the clamped value.
var wrappedValue: Value {
get {
return value
}
set {
value = range.clamp(newValue)
}
}
// Getter that returns the range.
var projectedValue: ClosedRange<Value> {
return range
}
}
// Example usage.
struct ClampedInt: ClampedProtocol {
@Clamped(0...100) var value: Int
init(wrappedValue: Int, _ range: ClosedRange<Int>) {
self.value = range.clamp(wrappedValue)
}
}
let clampedInt = ClampedInt(wrappedValue: 105)
print(clampedInt.value) // Prints "100"
clampedInt.value = -10
print(clampedInt.value) // Prints "0"
```self.value = range.clamp(wrappedValue) // value of type 'ClosedRange<Value>' has no member 'clamp'value = range.clamp(newValue) // value of type 'ClosedRange<Value>' has no member 'clamp'@Clamped(0...100) var value: Int // missing argument for parameter 'wrappedValue' in callself.value = range.clamp(wrappedValue) // value of type 'ClosedRange<Int>' has no member 'clamp'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
// Initializer for the property wrapper.
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = range.clamp(wrappedValue)
self.range = range
}
// Initializer for the property wrapper.
init(wrappedValue: Value) {
self.init(wrappedValue: wrappedValue, 0...100)
}
// Getter for the property wrapper.
var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
// Getter for the property wrapper.
var projectedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
struct ClampedValue: ClampedProtocol {
@Clamped var value: Int
init(wrappedValue: Int, _ range: ClosedRange<Int>) {
self.value = wrappedValue
}
}```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> {
private var value: Value
private let range: ClosedRange<Value>
// Initializer for the property wrapper.
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = range.clamp(wrappedValue)
self.range = range
}
// Initializer for the property wrapper.
init(wrappedValue: Value) {
self.init(wrappedValue: wrappedValue, 0...100)
}
// Getter for the property wrapper.
var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
// Getter for the property wrapper.
var projectedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
// A struct that uses the clamped property wrapper.
struct ClampedValue: ClampedProtocol {
@Clamped var value: Int
init(wrappedValue: Int, _ range: ClosedRange<Int>) {
self.value = wrappedValue
}
}
let clampedValue = ClampedValue(wrappedValue: 101)
print(clampedValue.value) // Prints "100"
clampedValue.value = -100
print(clampedValue.value) // Prints "0"
```self.value = range.clamp(wrappedValue) // value of type 'ClosedRange<Value>' has no member 'clamp'self.init(wrappedValue: wrappedValue, 0...100) // cannot convert value of type 'Int' to expected argument type 'Value'self.init(wrappedValue: wrappedValue, 0...100) // cannot convert value of type 'Int' to expected argument type 'Value'set { value = range.clamp(newValue) } // value of type 'ClosedRange<Value>' has no member 'clamp'set { value = range.clamp(newValue) } // value of type 'ClosedRange<Value>' has no member 'clamp'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var range: ClosedRange<Value>
private var wrappedValue: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.wrappedValue = range.clamp(wrappedValue)
}
public var value: Value {
get { wrappedValue }
set { wrappedValue = range.clamp(newValue) }
}
}
struct ClampedInt: ClampedProtocol {
@Clamped(0...100) var value: Int
init(wrappedValue: Int, _ range: ClosedRange<Int>) {
self.value = wrappedValue
}
}```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> {
private var range: ClosedRange<Value>
private var wrappedValue: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.wrappedValue = range.clamp(wrappedValue)
}
public var value: Value {
get { wrappedValue }
set { wrappedValue = range.clamp(newValue) }
}
}
struct ClampedInt: ClampedProtocol {
@Clamped(0...100) var value: Int
init(wrappedValue: Int, _ range: ClosedRange<Int>) {
self.value = wrappedValue
}
}
```private var wrappedValue: Value // private property 'wrappedValue' cannot have more restrictive access than its enclosing property wrapper type 'Clamped' (which is internal)self.wrappedValue = range.clamp(wrappedValue) // value of type 'ClosedRange<Value>' has no member 'clamp'set { wrappedValue = range.clamp(newValue) } // value of type 'ClosedRange<Value>' has no member 'clamp'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var range: ClosedRange<Value>
private var value: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = range.clamp(wrappedValue)
}
public var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
struct ClampedStruct: ClampedProtocol {
@Clamped(0...100) var age: Int
init(wrappedValue: Int, _ range: ClosedRange<Int>) {
self.age = wrappedValue
}
}```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> {
private var range: ClosedRange<Value>
private var value: Value
public init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = range.clamp(wrappedValue)
}
public var wrappedValue: Value {
get { value }
set { value = range.clamp(newValue) }
}
}
struct ClampedStruct: ClampedProtocol {
@Clamped(0...100) var age: Int
init(wrappedValue: Int, _ range: ClosedRange<Int>) {
self.age = wrappedValue
}
}
```self.value = range.clamp(wrappedValue) // value of type 'ClosedRange<Value>' has no member 'clamp'set { value = range.clamp(newValue) } // value of type 'ClosedRange<Value>' has no member 'clamp'@Clamped(0...100) var age: Int // 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: LoggedProtocol> {
private let logger: (Event, Value.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.value = Value(wrappedValue: wrappedValue, logger: logger)
self.logger = logger
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
struct Person: LoggedProtocol {
struct Value {
var name: String
var age: Int
}
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedPerson {
@Logged var person: Person
}```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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.value = Value(wrappedValue: wrappedValue, logger: logger)
self.logger = logger
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
// A struct that conforms to LoggedProtocol.
struct Person: LoggedProtocol {
struct Value {
var name: String
var age: Int
}
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A struct that uses the Logged property wrapper.
struct LoggedPerson {
@Logged var person: Person
}
let person = LoggedPerson(person: Person(wrappedValue: Person.Value(name: "John", age: 30)))
person.person.name = "Jane"
print(person.person.name)
```self.value = Value(wrappedValue: wrappedValue, logger: logger) // cannot convert value of type 'Value' (generic parameter of generic struct 'Logged') to expected argument type 'Value.Value' (associated type of protocol 'LoggedProtocol')logger(.get, value.wrappedValue) // value of type 'Value' has no member 'wrappedValue'return value.wrappedValue // value of type 'Value' has no member 'wrappedValue'value.wrappedValue = newValue // value of type 'Value' has no member 'wrappedValue'@Logged var person: Person // generic parameter 'Value' could not be inferred@Logged(logger: logger) var value: Int = 0 // generic struct 'Logged' requires that 'Int' conform to 'LoggedProtocol'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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.value = Value(wrappedValue: wrappedValue.wrappedValue, logger: logger)
self.logger = logger
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
struct Person: LoggedProtocol {
var wrappedValue: String
var name: String
init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
self.wrappedValue = wrappedValue
self.name = wrappedValue
logger(.get, wrappedValue)
}
}
struct Employee {
@Logged var name: Person
}```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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.value = Value(wrappedValue: wrappedValue.wrappedValue, logger: logger)
self.logger = logger
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
// A simple class that conforms to LoggedProtocol.
struct Person: LoggedProtocol {
var wrappedValue: String
var name: String
init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
self.wrappedValue = wrappedValue
self.name = wrappedValue
logger(.get, wrappedValue)
}
}
// A class that uses the Logged property wrapper.
struct Employee {
@Logged var name: Person
}
let employee = Employee(name: Person(wrappedValue: "John Doe"))
employee.name.wrappedValue = "Jane Doe"
```self.value = Value(wrappedValue: wrappedValue.wrappedValue, logger: logger) // value of type 'Value' has no member 'wrappedValue'logger(.get, value.wrappedValue) // value of type 'Value' has no member 'wrappedValue'return value.wrappedValue // value of type 'Value' has no member 'wrappedValue'value.wrappedValue = newValue // value of type 'Value' has no member 'wrappedValue'@Logged var name: Person // generic parameter 'Value' could not be inferred@Logged(logger: logger) var value: Int = 0 // generic struct 'Logged' requires that 'Int' conform to 'LoggedProtocol'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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
struct Person: LoggedProtocol {
var wrappedValue: (name: String, age: Int)
let logger: (Event, (name: String, age: Int)) -> Void
init(wrappedValue: (name: String, age: Int), logger: @escaping (Event, (name: String, age: Int)) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedPerson {
@Logged var person: Person
}```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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
// A struct that conforms to LoggedProtocol.
struct Person: LoggedProtocol {
var wrappedValue: (name: String, age: Int)
let logger: (Event, (name: String, age: Int)) -> Void
init(wrappedValue: (name: String, age: Int), logger: @escaping (Event, (name: String, age: Int)) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A struct that uses the Logged property wrapper.
struct LoggedPerson {
@Logged var person: Person
}
let person = LoggedPerson(person: Person(wrappedValue: (name: "John", age: 30), logger: { event, value in
print("\(event.rawValue) \(value)")
}))
print(person.person.wrappedValue.name)
// Prints "get (name: "John", age: 30)"
person.person.wrappedValue.name = "Jane"
// Prints "set (name: "Jane", age: 30)"
```self.value = Value(wrappedValue: wrappedValue, logger: logger) // cannot convert value of type 'Value' (generic parameter of generic struct 'Logged') to expected argument type 'Value.Value' (associated type of protocol 'LoggedProtocol')logger(.get, value.wrappedValue) // value of type 'Value' has no member 'wrappedValue'return value.wrappedValue // value of type 'Value' has no member 'wrappedValue'value.wrappedValue = newValue // value of type 'Value' has no member 'wrappedValue'@Logged var person: Person // generic parameter 'Value' could not be inferred@Logged(logger: logger) var value: Int = 0 // generic struct 'Logged' requires that 'Int' conform to 'LoggedProtocol'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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
struct IntWrapper: LoggedProtocol {
var wrappedValue: Int
private let logger: (Event, Int) -> Void
init(wrappedValue: Int, logger: @escaping (Event, Int) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct Person {
@Logged var age: IntWrapper
}```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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
// A struct that conforms to LoggedProtocol.
struct IntWrapper: LoggedProtocol {
var wrappedValue: Int
private let logger: (Event, Int) -> Void
init(wrappedValue: Int, logger: @escaping (Event, Int) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A struct that uses the Logged property wrapper.
struct Person {
@Logged var age: IntWrapper
}
let person = Person(age: IntWrapper(wrappedValue: 30) { event, value in
print("Person's age was \(event.rawValue) to \(value)")
})
person.age = 31
// Person's age was get to 30
// Person's age was set to 31
```self.value = Value(wrappedValue: wrappedValue, logger: logger) // cannot convert value of type 'Value' (generic parameter of generic struct 'Logged') to expected argument type 'Value.Value' (associated type of protocol 'LoggedProtocol')logger(.get, value.wrappedValue) // value of type 'Value' has no member 'wrappedValue'return value.wrappedValue // value of type 'Value' has no member 'wrappedValue'value.wrappedValue = newValue // value of type 'Value' has no member 'wrappedValue'@Logged var age: IntWrapper // generic parameter 'Value' could not be inferred@Logged(logger: logger) var value: Int = 0 // generic struct 'Logged' requires that 'Int' conform to 'LoggedProtocol'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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
struct Person: LoggedProtocol {
struct Value {
var name: String
var age: Int
}
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct Student {
@Logged var person: Person = Person(wrappedValue: Person.Value(name: "John", age: 20))
}```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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
// A simple class that conforms to LoggedProtocol.
struct Person: LoggedProtocol {
struct Value {
var name: String
var age: Int
}
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A simple class that uses the Logged property wrapper.
struct Student {
@Logged var person: Person = Person(wrappedValue: Person.Value(name: "John", age: 20))
}
let student = Student()
print(student.person.name) // Prints "John"
student.person.name = "Jane" // Prints "set: Jane"
```self.value = Value(wrappedValue: wrappedValue, logger: logger) // cannot convert value of type 'Value' (generic parameter of generic struct 'Logged') to expected argument type 'Value.Value' (associated type of protocol 'LoggedProtocol')logger(.get, value.wrappedValue) // value of type 'Value' has no member 'wrappedValue'return value.wrappedValue // value of type 'Value' has no member 'wrappedValue'value.wrappedValue = newValue // value of type 'Value' has no member 'wrappedValue'@Logged var person: Person = Person(wrappedValue: Person.Value(name: "John", age: 20)) // missing argument for parameter 'logger' in call@Logged var person: Person = Person(wrappedValue: Person.Value(name: "John", age: 20)) // missing argument for parameter 'logger' in property wrapper initializer; add 'wrappedValue' and 'logger' arguments in '@Logged(...)'@Logged var person: Person = Person(wrappedValue: Person.Value(name: "John", age: 20)) // property type 'Person' does not match 'wrappedValue' type 'Person.Value'@Logged(logger: logger) var value: Int = 0 // generic struct 'Logged' requires that 'Int' conform to 'LoggedProtocol'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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
struct Person: LoggedProtocol {
struct Value {
var name: String
var age: Int
}
let wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedPerson {
@Logged var person: Person
}```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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
// A struct that conforms to LoggedProtocol.
struct Person: LoggedProtocol {
struct Value {
var name: String
var age: Int
}
let wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A struct that uses the Logged property wrapper.
struct LoggedPerson {
@Logged var person: Person
}
let person = LoggedPerson(person: Person(wrappedValue: Person.Value(name: "John", age: 30), logger: { event, value in
print("\(event.rawValue) \(value)")
}))
person.person.name = "Jane"
// set Person(name: "Jane", age: 30)
person.person.age = 31
// set Person(name: "Jane", age: 31)
print(person.person.name)
// get Person(name: "Jane", age: 31)
print(person.person.age)
// get Person(name: "Jane", age: 31)
```self.value = Value(wrappedValue: wrappedValue, logger: logger) // cannot convert value of type 'Value' (generic parameter of generic struct 'Logged') to expected argument type 'Value.Value' (associated type of protocol 'LoggedProtocol')logger(.get, value.wrappedValue) // value of type 'Value' has no member 'wrappedValue'return value.wrappedValue // value of type 'Value' has no member 'wrappedValue'value.wrappedValue = newValue // value of type 'Value' has no member 'wrappedValue'@Logged var person: Person // generic parameter 'Value' could not be inferred@Logged(logger: logger) var value: Int = 0 // generic struct 'Logged' requires that 'Int' conform to 'LoggedProtocol'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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
struct Person: LoggedProtocol {
var name: String
var age: Int
init(wrappedValue: Self, logger: @escaping (Event, Self) -> Void) {
self = wrappedValue
self.name = Logged(wrappedValue: wrappedValue.name, logger: { event, value in
logger(event, Person(name: value, age: wrappedValue.age))
})
self.age = Logged(wrappedValue: wrappedValue.age, logger: { event, value in
logger(event, Person(name: wrappedValue.name, age: 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> {
private let logger: (Event, Value.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
// A simple class that logs its property accesses and modifications.
struct Person: LoggedProtocol {
var name: String
var age: Int
init(wrappedValue: Self, logger: @escaping (Event, Self) -> Void) {
self = wrappedValue
self.name = Logged(wrappedValue: wrappedValue.name, logger: { event, value in
logger(event, Person(name: value, age: wrappedValue.age))
})
self.age = Logged(wrappedValue: wrappedValue.age, logger: { event, value in
logger(event, Person(name: wrappedValue.name, age: value))
})
}
}
// Create a Person instance and log its property accesses and modifications.
let person = Person(name: "John", age: 30)
person.name.wrappedValue = "Jane"
person.age.wrappedValue = 31
```self.value = Value(wrappedValue: wrappedValue, logger: logger) // cannot convert value of type 'Value' (generic parameter of generic struct 'Logged') to expected argument type 'Value.Value' (associated type of protocol 'LoggedProtocol')logger(.get, value.wrappedValue) // value of type 'Value' has no member 'wrappedValue'return value.wrappedValue // value of type 'Value' has no member 'wrappedValue'value.wrappedValue = newValue // value of type 'Value' has no member 'wrappedValue'self.name = Logged(wrappedValue: wrappedValue.name, logger: { event, value in // cannot assign value of type 'Logged<String>' to type 'String'self.name = Logged(wrappedValue: wrappedValue.name, logger: { event, value in // generic struct 'Logged' requires that 'String' conform to 'LoggedProtocol'logger(event, Person(name: value, age: wrappedValue.age)) // cannot convert value of type 'Int' to expected argument type '(Event, Person) -> Void'logger(event, Person(name: value, age: wrappedValue.age)) // incorrect argument labels in call (have 'name:age:', expected 'wrappedValue:logger:')self.age = Logged(wrappedValue: wrappedValue.age, logger: { event, value in // cannot assign value of type 'Logged<Int>' to type 'Int'self.age = Logged(wrappedValue: wrappedValue.age, logger: { event, value in // generic struct 'Logged' requires that 'Int' conform to 'LoggedProtocol'logger(event, Person(name: wrappedValue.name, age: value)) // incorrect argument labels in call (have 'name:age:', expected 'wrappedValue:logger:')logger(event, Person(name: wrappedValue.name, age: value)) // cannot convert value of type 'String' to expected argument type 'Person'@Logged(logger: logger) var value: Int = 0 // generic struct 'Logged' requires that 'Int' conform to 'LoggedProtocol'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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
struct Person: LoggedProtocol {
struct Value {
var name: String
var age: Int
}
let wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedPerson {
@Logged var person: Person
}```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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
// A struct that conforms to LoggedProtocol.
struct Person: LoggedProtocol {
struct Value {
var name: String
var age: Int
}
let wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A struct that uses the Logged property wrapper.
struct LoggedPerson {
@Logged var person: Person
}
let person = LoggedPerson(person: Person(wrappedValue: Person.Value(name: "John", age: 30), logger: { event, value in
print("\(event.rawValue) \(value)")
}))
print(person.person.name)
// Prints "get Person(name: "John", age: 30)".
person.person.name = "Jane"
// Prints "set Person(name: "Jane", age: 30)".
```self.value = Value(wrappedValue: wrappedValue, logger: logger) // cannot convert value of type 'Value' (generic parameter of generic struct 'Logged') to expected argument type 'Value.Value' (associated type of protocol 'LoggedProtocol')logger(.get, value.wrappedValue) // value of type 'Value' has no member 'wrappedValue'return value.wrappedValue // value of type 'Value' has no member 'wrappedValue'value.wrappedValue = newValue // value of type 'Value' has no member 'wrappedValue'@Logged var person: Person // generic parameter 'Value' could not be inferred@Logged(logger: logger) var value: Int = 0 // generic struct 'Logged' requires that 'Int' conform to 'LoggedProtocol'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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
struct LoggedValue: LoggedProtocol {
var wrappedValue: Int
private let logger: (Event, Int) -> Void
init(wrappedValue: Int, logger: @escaping (Event, Int) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedString: LoggedProtocol {
var wrappedValue: String
private let logger: (Event, String) -> Void
init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedBool: LoggedProtocol {
var wrappedValue: Bool
private let logger: (Event, Bool) -> Void
init(wrappedValue: Bool, logger: @escaping (Event, Bool) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedDouble: LoggedProtocol {
var wrappedValue: Double
private let logger: (Event, Double) -> Void
init(wrappedValue: Double, logger: @escaping (Event, Double) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedFloat: LoggedProtocol {
var wrappedValue: Float
private let logger: (Event, Float) -> Void
init(wrappedValue: Float, logger: @escaping (Event, Float) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedArray: LoggedProtocol {
var wrappedValue: [Int]
private let logger: (Event, [Int]) -> Void
init(wrappedValue: [Int], logger: @escaping (Event, [Int]) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedDictionary: LoggedProtocol {
var wrappedValue: [String: Int]
private let logger: (Event, [String: Int]) -> Void
init(wrappedValue: [String: Int], logger: @escaping (Event, [String: Int]) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedSet: LoggedProtocol {
var wrappedValue: Set<Int>
private let logger: (Event, Set<Int>) -> Void
init(wrappedValue: Set<Int>, logger: @escaping (Event, Set<Int>) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}```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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
// A simple class that logs access and modification of its `value` property.
struct LoggedValue: LoggedProtocol {
var wrappedValue: Int
private let logger: (Event, Int) -> Void
init(wrappedValue: Int, logger: @escaping (Event, Int) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A simple class that logs access and modification of its `value` property.
struct LoggedString: LoggedProtocol {
var wrappedValue: String
private let logger: (Event, String) -> Void
init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A simple class that logs access and modification of its `value` property.
struct LoggedBool: LoggedProtocol {
var wrappedValue: Bool
private let logger: (Event, Bool) -> Void
init(wrappedValue: Bool, logger: @escaping (Event, Bool) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A simple class that logs access and modification of its `value` property.
struct LoggedDouble: LoggedProtocol {
var wrappedValue: Double
private let logger: (Event, Double) -> Void
init(wrappedValue: Double, logger: @escaping (Event, Double) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A simple class that logs access and modification of its `value` property.
struct LoggedFloat: LoggedProtocol {
var wrappedValue: Float
private let logger: (Event, Float) -> Void
init(wrappedValue: Float, logger: @escaping (Event, Float) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A simple class that logs access and modification of its `value` property.
struct LoggedArray: LoggedProtocol {
var wrappedValue: [Int]
private let logger: (Event, [Int]) -> Void
init(wrappedValue: [Int], logger: @escaping (Event, [Int]) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A simple class that logs access and modification of its `value` property.
struct LoggedDictionary: LoggedProtocol {
var wrappedValue: [String: Int]
private let logger: (Event, [String: Int]) -> Void
init(wrappedValue: [String: Int], logger: @escaping (Event, [String: Int]) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A simple class that logs access and modification of its `value` property.
struct LoggedSet: LoggedProtocol {
var wrappedValue: Set<Int>
private let logger: (Event, Set<Int>) -> Void
init(wrappedValue: Set<Int>, logger: @escaping (Event, Set<Int>) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A simple class that logs access and modification of its `value` property.
struct LoggedOptional: LoggedProtocol {
var wrappedValue: Int?
private let logger: (Event,self.value = Value(wrappedValue: wrappedValue, logger: logger) // cannot convert value of type 'Value' (generic parameter of generic struct 'Logged') to expected argument type 'Value.Value' (associated type of protocol 'LoggedProtocol')logger(.get, value.wrappedValue) // value of type 'Value' has no member 'wrappedValue'return value.wrappedValue // value of type 'Value' has no member 'wrappedValue'value.wrappedValue = newValue // value of type 'Value' has no member 'wrappedValue'@Logged(logger: logger) var value: Int = 0 // generic struct 'Logged' requires that 'Int' conform to 'LoggedProtocol'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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
struct Person: LoggedProtocol {
struct Value {
var name: String
var age: Int
}
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedPerson {
@Logged var person: Person
}```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.Value) -> Void
private var value: Value
public init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
self.logger = logger
self.value = Value(wrappedValue: wrappedValue, logger: logger)
}
public var wrappedValue: Value.Value {
get {
logger(.get, value.wrappedValue)
return value.wrappedValue
}
set {
logger(.set, newValue)
value.wrappedValue = newValue
}
}
}
// A struct that conforms to LoggedProtocol.
struct Person: LoggedProtocol {
struct Value {
var name: String
var age: Int
}
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// A struct that uses the Logged property wrapper.
struct LoggedPerson {
@Logged var person: Person
}
let person = LoggedPerson(person: Person(wrappedValue: Person.Value(name: "John", age: 30)))
person.person.name = "Jane"
print(person.person.name)
```self.value = Value(wrappedValue: wrappedValue, logger: logger) // cannot convert value of type 'Value' (generic parameter of generic struct 'Logged') to expected argument type 'Value.Value' (associated type of protocol 'LoggedProtocol')logger(.get, value.wrappedValue) // value of type 'Value' has no member 'wrappedValue'return value.wrappedValue // value of type 'Value' has no member 'wrappedValue'value.wrappedValue = newValue // value of type 'Value' has no member 'wrappedValue'@Logged var person: Person // generic parameter 'Value' could not be inferred@Logged(logger: logger) var value: Int = 0 // generic struct 'Logged' requires that 'Int' conform to 'LoggedProtocol'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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
return nil
}
}
struct MockWeatherProvider: WeatherProvider {
let forecast: (String) -> String
func forecast(for city: String) throws -> String {
return forecast(city)
}
}
struct MockWeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchText = ""
var feedback: [ApplicationFeedback] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
let feedback = ApplicationFeedback.success(city: searchText, forecast: forecast)
self.feedback.append(feedback)
return feedback
} catch {
let feedback = ApplicationFeedback.failure(city: searchText)
self.feedback.append(feedback)
return feedback
}
}
return nil
}
}
func testMockWeatherApplication() {
let provider = MockWeatherProvider { _ in "" }
let application = MockWeatherApplication(provider: provider)
application.handle(action: .keyboardCharacterSelect("A"))
application.handle(action: .keyboardCharacterSelect("B"))
application.handle(action: .keyboardCharacterSelect("C"))
application.handle(action: .searchButtonPress)
XCTAssertEqual(application.feedback, [.failure(city: "ABC")])
}```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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
return nil
}
}
// Mock provider.
struct MockWeatherProvider: WeatherProvider {
let forecast: (String) -> String
func forecast(for city: String) throws -> String {
return forecast(city)
}
}
// Mock application.
struct MockWeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchText = ""
var feedback: [ApplicationFeedback] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
let feedback = ApplicationFeedback.success(city: searchText, forecast: forecast)
self.feedback.append(feedback)
return feedback
} catch {
let feedback = ApplicationFeedback.failure(city: searchText)
self.feedback.append(feedback)
return feedback
}
}
return nil
}
}
// Mock application test.
func testMockWeatherApplication() {
let provider = MockWeatherProvider { _ in "" }
let application = MockWeatherApplication(provider: provider)
application.handle(action: .keyboardCharacterSelect("A"))
application.handle(action: .keyboardCharacterSelect("B"))
application.handle(action: .keyboardCharacterSelect("C"))
application.handle(action: .searchButtonPress)
XCTAssertEqual(application.feedback, [.failure(city: "ABC")])
}
testMockWeatherApplication()
```init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'searchText.append(character) // cannot use mutating member on immutable value: 'self' is immutablesearchText.removeLast() // cannot use mutating member on immutable value: 'self' is immutableself.feedback.append(feedback) // cannot use mutating member on immutable value: 'self' is immutableself.feedback.append(feedback) // cannot use mutating member on immutable value: 'self' is immutableapplication.handle(action: .keyboardCharacterSelect("A")) // result of call to 'handle(action:)' is unusedapplication.handle(action: .keyboardCharacterSelect("B")) // result of call to 'handle(action:)' is unusedapplication.handle(action: .keyboardCharacterSelect("C")) // result of call to 'handle(action:)' is unusedapplication.handle(action: .searchButtonPress) // result of call to 'handle(action:)' is unusedprotocol 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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
return nil
}
}```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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
return nil
}
}
```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
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}
class WeatherProviderMock: WeatherProvider {
var forecastForCity: (String) -> String
init(forecastForCity: @escaping (String) -> String) {
self.forecastForCity = forecastForCity
}
func forecast(for city: String) throws -> String {
return forecastForCity(city)
}
}
class WeatherApplicationMock: WeatherApplicationProtocol {
var handleAction: (UserAction) -> ApplicationFeedback?
init(handleAction: @escaping (UserAction) -> ApplicationFeedback?) {
self.handleAction = handleAction
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handleAction(action)
}
}```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 = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}
// Mock provider.
class WeatherProviderMock: WeatherProvider {
var forecastForCity: (String) -> String
init(forecastForCity: @escaping (String) -> String) {
self.forecastForCity = forecastForCity
}
func forecast(for city: String) throws -> String {
return forecastForCity(city)
}
}
// Mock application.
class WeatherApplicationMock: WeatherApplicationProtocol {
var handleAction: (UserAction) -> ApplicationFeedback?
init(handleAction: @escaping (UserAction) -> ApplicationFeedback?) {
self.handleAction = handleAction
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handleAction(action)
}
}
// Test.
func testWeatherApplication() {
let provider = WeatherProviderMock(forecastForCity: { city in
switch city {
case "London":
return "Cloudy"
case "Paris":
return "Sunny"
default:
throw WeatherError.invalidCity
}
})
let application = WeatherApplication(provider: provider)
application.handle(action: .keyboardCharacterSelect("L"))
application.handle(action: .keyboardCharacterSelect("o"))
application.handle(action: .keyboardCharacterSelect("n"))
application.handle(action: .keyboardCharacterSelect("d"))
application.handle(action: .keyboardCharacterSelect("o"))
application.handle(action: .keyboardCharacterSelect("n"))
application.handle(action: .searchButtonPress)
XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "London", forecast: "Cloudy"))
XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "London", forecast: "Cloudy"))
XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "London", forecast: "Cloudy"))
application.handle(action: .keyboardCharacterSelect("P"))
application.handle(action: .keyboardCharacterSelect("a"))
application.handle(action: .keyboardCharacterSelect("r"))
application.handle(action: .keyboardCharacterSelect("i"))
application.handle(action: .keyboardCharacterSelect("s"))
application.handle(action: .searchButtonPress)
XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "Paris", forecast: "Sunny"))
XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "Paris", forecast: "Sunny"))
XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "Paris", forecast: "Sunny"))
application.handle(action: .keyboardCharacterSelect("M"))
application.handle(action: .keyboardCharacterSelect("o"))
application.handle(action: .keyboardCharacterSelect("s"))
application.handle(action: .keyboardCharacterSelect("c"))
application.handle(action: .keyboardCharacterSelect("oinit(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'class WeatherApplicationMock: WeatherApplicationProtocol { // type 'WeatherApplicationMock' does not conform to protocol 'WeatherApplicationDependencies'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
private var searchText = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
return nil
}
}
struct MockWeatherProvider: WeatherProvider {
var forecast: (for: String) -> String
func forecast(for city: String) throws -> String {
return forecast(for: city)
}
}
struct MockWeatherApplication: WeatherApplicationProtocol {
var provider: WeatherProvider
var handle: (action: UserAction) -> ApplicationFeedback?
init(provider: WeatherProvider, handle: @escaping (action: UserAction) -> ApplicationFeedback?) {
self.provider = provider
self.handle = handle
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handle(action: action)
}
}
struct MockWeatherApplicationDependencies: WeatherApplicationDependencies {
var provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
}
struct MockWeatherApplicationInteractions: WeatherApplicationInteractions {
var handle: (action: UserAction) -> ApplicationFeedback?
init(handle: @escaping (action: UserAction) -> ApplicationFeedback?) {
self.handle = handle
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handle(action: action)
}
}
struct MockWeatherApplicationProtocol: WeatherApplicationProtocol {
var provider: WeatherProvider
var handle: (action: UserAction) -> ApplicationFeedback?
init(provider: WeatherProvider, handle: @escaping (action: UserAction) -> ApplicationFeedback?) {
self.provider = provider
self.handle = handle
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handle(action: action)
}
}
struct MockWeatherApplicationProtocolDependencies: WeatherApplicationProtocol {
var provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
}
struct MockWeatherApplicationProtocolInteractions: WeatherApplicationProtocolInteractions {
var handle: (action: UserAction) -> ApplicationFeedback?
init(handle: @escaping (action: UserAction) -> ApplicationFeedback?) {
self.handle = handle
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handle(action: action)
}
}
struct MockWeatherApplicationProtocolProtocol: WeatherApplicationProtocol {
var provider: WeatherProvider
var handle: (action: UserAction) -> ApplicationFeedback?
init(provider: WeatherProvider, handle: @escaping (action: UserAction) -> ApplicationFeedback?) {
self.provider = provider
self.handle = handle
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handle(action: action)
}
}
struct MockWeatherApplicationProtocolProtocolDependencies: WeatherApplicationProtocol {
var provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
}```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 searchText = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
return nil
}
}
// Mock provider for testing.
struct MockWeatherProvider: WeatherProvider {
var forecast: (for: String) -> String
func forecast(for city: String) throws -> String {
return forecast(for: city)
}
}
// Mock application for testing.
struct MockWeatherApplication: WeatherApplicationProtocol {
var provider: WeatherProvider
var handle: (action: UserAction) -> ApplicationFeedback?
init(provider: WeatherProvider, handle: @escaping (action: UserAction) -> ApplicationFeedback?) {
self.provider = provider
self.handle = handle
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handle(action: action)
}
}
// Mock application for testing.
struct MockWeatherApplicationDependencies: WeatherApplicationDependencies {
var provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
}
// Mock application for testing.
struct MockWeatherApplicationInteractions: WeatherApplicationInteractions {
var handle: (action: UserAction) -> ApplicationFeedback?
init(handle: @escaping (action: UserAction) -> ApplicationFeedback?) {
self.handle = handle
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handle(action: action)
}
}
// Mock application for testing.
struct MockWeatherApplicationProtocol: WeatherApplicationProtocol {
var provider: WeatherProvider
var handle: (action: UserAction) -> ApplicationFeedback?
init(provider: WeatherProvider, handle: @escaping (action: UserAction) -> ApplicationFeedback?) {
self.provider = provider
self.handle = handle
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handle(action: action)
}
}
// Mock application for testing.
struct MockWeatherApplicationProtocolDependencies: WeatherApplicationProtocol {
var provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
}
// Mock application for testing.
struct MockWeatherApplicationProtocolInteractions: WeatherApplicationProtocolInteractions {
var handle: (action: UserAction) -> ApplicationFeedback?
init(handle: @escaping (action: UserAction) -> ApplicationFeedback?) {
self.handle = handle
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handle(action: action)
}
}
// Mock application for testing.
struct MockWeatherApplicationProtocolProtocol: WeatherApplicationProtocol {
var provider: WeatherProvider
var handle: (action: UserAction) -> ApplicationFeedback?
init(provider: WeatherProvider, handle: @escaping (action: UserAction) -> ApplicationFeedback?) {
self.provider = provider
self.handle = handle
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handle(action: action)
}
}
// Mock application for testing.
struct MockWeatherApplicationProtocolProtocolDependencies: WeatherApplicationProtocol {
var provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
}
// Mock application for testing.
struct MockWeatherApplicationProtocolProtocolInteractions: WeatherApplicationProtocolInteractions {
var handle: (action: UserAction) -> ApplicationFeedback?
init(handle: @escaping (actionvar forecast: (for: String) -> String // function types cannot have argument labels; use '_' before 'for'return forecast(for: city) // call can throw but is not marked with 'try'struct MockWeatherApplication: WeatherApplicationProtocol { // type 'MockWeatherApplication' does not conform to protocol 'WeatherApplicationDependencies'var handle: (action: UserAction) -> ApplicationFeedback? // function types cannot have argument labels; use '_' before 'action'init(provider: WeatherProvider, handle: @escaping (action: UserAction) -> ApplicationFeedback?) { // function types cannot have argument labels; use '_' before 'action'var handle: (action: UserAction) -> ApplicationFeedback? // function types cannot have argument labels; use '_' before 'action'init(handle: @escaping (action: UserAction) -> ApplicationFeedback?) { // function types cannot have argument labels; use '_' before 'action'struct MockWeatherApplicationProtocol: WeatherApplicationProtocol { // type 'MockWeatherApplicationProtocol' does not conform to protocol 'WeatherApplicationDependencies'var handle: (action: UserAction) -> ApplicationFeedback? // function types cannot have argument labels; use '_' before 'action'init(provider: WeatherProvider, handle: @escaping (action: UserAction) -> ApplicationFeedback?) { // function types cannot have argument labels; use '_' before 'action'struct MockWeatherApplicationProtocolDependencies: WeatherApplicationProtocol { // type 'MockWeatherApplicationProtocolDependencies' does not conform to protocol 'WeatherApplicationInteractions'struct MockWeatherApplicationProtocolInteractions: WeatherApplicationProtocolInteractions { // cannot find type 'WeatherApplicationProtocolInteractions' in scopevar handle: (action: UserAction) -> ApplicationFeedback? // function types cannot have argument labels; use '_' before 'action'init(handle: @escaping (action: UserAction) -> ApplicationFeedback?) { // function types cannot have argument labels; use '_' before 'action'struct MockWeatherApplicationProtocolProtocol: WeatherApplicationProtocol { // type 'MockWeatherApplicationProtocolProtocol' does not conform to protocol 'WeatherApplicationDependencies'var handle: (action: UserAction) -> ApplicationFeedback? // function types cannot have argument labels; use '_' before 'action'init(provider: WeatherProvider, handle: @escaping (action: UserAction) -> ApplicationFeedback?) { // function types cannot have argument labels; use '_' before 'action'struct MockWeatherApplicationProtocolProtocolDependencies: WeatherApplicationProtocol { // type 'MockWeatherApplicationProtocolProtocolDependencies' does not conform to protocol 'WeatherApplicationInteractions'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
private var searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
return nil
}
}
struct MockWeatherProvider: WeatherProvider {
func forecast(for city: String) throws -> String {
switch city {
case "London":
return "Sunny"
case "Paris":
return "Rainy"
default:
throw Error.unknownCity
}
}
}
enum Error: Swift.Error {
case unknownCity
}```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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
return nil
}
}
// Mock provider to test application.
struct MockWeatherProvider: WeatherProvider {
func forecast(for city: String) throws -> String {
switch city {
case "London":
return "Sunny"
case "Paris":
return "Rainy"
default:
throw Error.unknownCity
}
}
}
enum Error: Swift.Error {
case unknownCity
}
// Test application.
let application = WeatherApplication(provider: MockWeatherProvider())
// User action.
let userAction = UserAction.keyboardCharacterSelect("L")
// Handle user action.
let feedback = application.handle(action: userAction)
// Print feedback.
print(feedback)
```init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'enum WeatherProviderError: Error { // 'WeatherProviderError' declares raw type 'Error', but does not conform to RawRepresentable and conformance could not be synthesizedenum WeatherProviderError: Error { // raw type 'Error' is not expressible by a string, integer, or floating-point literalcase notFound(city: String) // enum with raw type cannot have cases with argumentsprotocol 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 = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}
struct MockWeatherProvider: WeatherProvider {
let forecast: (String) -> String
func forecast(for city: String) throws -> String {
return forecast(city)
}
}
struct MockWeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText = ""
var feedback: [ApplicationFeedback] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
let feedback = ApplicationFeedback.success(city: searchBarText, forecast: forecast)
self.feedback.append(feedback)
return feedback
} catch {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.feedback.append(feedback)
return feedback
}
}
return nil
}
}
struct MockWeatherApplicationDI: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText = ""
var feedback: [ApplicationFeedback] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
let feedback = ApplicationFeedback.success(city: searchBarText, forecast: forecast)
self.feedback.append(feedback)
return feedback
} catch {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.feedback.append(feedback)
return feedback
}
}
return nil
}
}
struct MockWeatherApplicationDIP: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText = ""
var feedback: [ApplicationFeedback] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
let feedback = ApplicationFeedback.success(city: searchBarText, forecast: forecast)
self.feedback.append(feedback)
return feedback
} catch {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.feedback.append(feedback)
return feedback
}
}
return nil
}
}```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 = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}
// Mock WeatherProvider
struct MockWeatherProvider: WeatherProvider {
let forecast: (String) -> String
func forecast(for city: String) throws -> String {
return forecast(city)
}
}
// Mock WeatherApplication
struct MockWeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText = ""
var feedback: [ApplicationFeedback] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
let feedback = ApplicationFeedback.success(city: searchBarText, forecast: forecast)
self.feedback.append(feedback)
return feedback
} catch {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.feedback.append(feedback)
return feedback
}
}
return nil
}
}
// Mock WeatherApplication with dependency injection.
struct MockWeatherApplicationDI: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText = ""
var feedback: [ApplicationFeedback] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
let feedback = ApplicationFeedback.success(city: searchBarText, forecast: forecast)
self.feedback.append(feedback)
return feedback
} catch {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.feedback.append(feedback)
return feedback
}
}
return nil
}
}
// Mock WeatherApplication with dependency injection and protocol.
struct MockWeatherApplicationDIP: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText = ""
var feedback: [ApplicationFeedback] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
let feedback = ApplicationFeedback.success(city: searchBarText, forecast: forecast)
self.feedback.append(feedback)
return feedback
} catch {
let feedback = ApplicationFeedback.failure(city: searchBarText)
self.feedback.append(feedback)
return feedback
}
}
return nil
}
}
// Mock WeatherApplication with dependency injection and protocol and dependency injection.
struct MockWeatherApplicationDIPDI: WeatherApplicationProtocol {
let providersearchBarText.append(character) // cannot use mutating member on immutable value: 'self' is immutablesearchBarText.removeLast() // cannot use mutating member on immutable value: 'self' is immutableself.feedback.append(feedback) // cannot use mutating member on immutable value: 'self' is immutableself.feedback.append(feedback) // cannot use mutating member on immutable value: 'self' is immutablesearchBarText.append(character) // cannot use mutating member on immutable value: 'self' is immutablesearchBarText.removeLast() // cannot use mutating member on immutable value: 'self' is immutableself.feedback.append(feedback) // cannot use mutating member on immutable value: 'self' is immutableself.feedback.append(feedback) // cannot use mutating member on immutable value: 'self' is immutablesearchBarText.append(character) // cannot use mutating member on immutable value: 'self' is immutablesearchBarText.removeLast() // cannot use mutating member on immutable value: 'self' is immutableself.feedback.append(feedback) // cannot use mutating member on immutable value: 'self' is immutableself.feedback.append(feedback) // cannot use mutating member on immutable value: 'self' is immutableprotocol 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
private var searchText = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
return nil
}
}
class MockWeatherProvider: WeatherProvider {
var forecastResult: Result<String, Error>
func forecast(for city: String) throws -> String {
return try forecastResult.get()
}
}
class MockWeatherApplication: WeatherApplicationProtocol {
var provider: WeatherProvider
var userActions: [UserAction] = []
var applicationFeedbacks: [ApplicationFeedback] = []
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
userActions.append(action)
let feedback = WeatherApplication(provider: provider).handle(action: action)
if let feedback = feedback {
applicationFeedbacks.append(feedback)
}
return feedback
}
}```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 searchText = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
return nil
}
}
// Mock WeatherProvider.
class MockWeatherProvider: WeatherProvider {
var forecastResult: Result<String, Error>
func forecast(for city: String) throws -> String {
return try forecastResult.get()
}
}
// Mock WeatherApplication.
class MockWeatherApplication: WeatherApplicationProtocol {
var provider: WeatherProvider
var userActions: [UserAction] = []
var applicationFeedbacks: [ApplicationFeedback] = []
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
userActions.append(action)
let feedback = WeatherApplication(provider: provider).handle(action: action)
if let feedback = feedback {
applicationFeedbacks.append(feedback)
}
return feedback
}
}
// Test cases.
let mockProvider = MockWeatherProvider()
let mockApplication = MockWeatherApplication(provider: mockProvider)
// Test case 1.
mockProvider.forecastResult = .success("Sunny")
mockApplication.handle(action: .keyboardCharacterSelect("S"))
mockApplication.handle(action: .keyboardCharacterSelect("a"))
mockApplication.handle(action: .keyboardCharacterSelect("n"))
mockApplication.handle(action: .keyboardCharacterSelect("f"))
mockApplication.handle(action: .keyboardCharacterSelect("r"))
mockApplication.handle(action: .keyboardCharacterSelect("o"))
mockApplication.handle(action: .keyboardCharacterSelect("r"))
mockApplication.handle(action: .keyboardCharacterSelect("e"))
mockApplication.handle(action: .keyboardCharacterSelect("s"))
mockApplication.handle(action: .keyboardCharacterSelect("t"))
mockApplication.handle(action: .searchButtonPress)
// Test case 2.
mockProvider.forecastResult = .success("Sunny")
mockApplication.handle(action: .keyboardCharacterSelect("S"))
mockApplication.handle(action: .keyboardCharacterSelect("a"))
mockApplication.handle(action: .keyboardCharacterSelect("n"))
mockApplication.handle(action: .keyboardCharacterSelect("f"))
mockApplication.handle(action: .keyboardCharacterSelect("r"))
mockApplication.handle(action: .keyboardCharacterSelect("o"))
mockApplication.handle(action: .keyboardCharacterSelect("r"))
mockApplication.handle(action: .keyboardCharacterSelect("e"))
mockApplication.handle(action: .keyboardCharacterSelect("s"))
mockApplication.handle(action: .keyboardCharacterSelect("t"))
mockApplication.handle(action: .keyboardDeleteBackwards)
mockApplication.handle(action: .keyboardDeleteBackwards)
mockApplication.handle(action: .keyboardDeleteBackwards)
mockApplication.handle(action: .keyboardDeleteBackwards)
mockApplication.handle(action: .keyboardDeleteBackwards)
mockApplication.handle(action: .keyboardDeleteBackwards)
mockApplication.handle(action: .keyboardDeleteBackwards)
mockApplication.handle(action: .keyboardDeleteBackwards)
mockApplication.handle(action: .keyboardDeleteBackwards)
mockApplication.handle(action: .keyboardDeleteBackwards)
mockApplicationclass MockWeatherProvider: WeatherProvider { // class 'MockWeatherProvider' has no initializersprotocol 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 = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}
struct WeatherProviderMock: WeatherProvider {
var forecast: (for: String) -> String
func forecast(for city: String) throws -> String {
return forecast(for: city)
}
}
struct WeatherApplicationMock: WeatherApplicationProtocol {
var provider: WeatherProvider
var searchBarText = ""
var feedback: ApplicationFeedback?
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
feedback = .success(city: searchBarText, forecast: forecast)
} catch {
feedback = .failure(city: searchBarText)
}
}
return feedback
}
}```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 = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}
// Mock provider
struct WeatherProviderMock: WeatherProvider {
var forecast: (for: String) -> String
func forecast(for city: String) throws -> String {
return forecast(for: city)
}
}
// Mock application
struct WeatherApplicationMock: WeatherApplicationProtocol {
var provider: WeatherProvider
var searchBarText = ""
var feedback: ApplicationFeedback?
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
feedback = .success(city: searchBarText, forecast: forecast)
} catch {
feedback = .failure(city: searchBarText)
}
}
return feedback
}
}
// Test
let mockProvider = WeatherProviderMock(forecast: { _ in "sunny" })
let mockApplication = WeatherApplicationMock(provider: mockProvider)
mockApplication.handle(action: .keyboardCharacterSelect("B"))
mockApplication.handle(action: .keyboardCharacterSelect("o"))
mockApplication.handle(action: .keyboardCharacterSelect("o"))
mockApplication.handle(action: .keyboardCharacterSelect("k"))
mockApplication.handle(action: .keyboardCharacterSelect("s"))
mockApplication.handle(action: .searchButtonPress)
// Prints "success(city: "Books", forecast: "sunny")"
print(mockApplication.feedback!)
```var forecast: (for: String) -> String // function types cannot have argument labels; use '_' before 'for'return forecast(for: city) // call can throw but is not marked with 'try'required init(provider: WeatherProvider) { // 'required' initializer in non-class type 'WeatherApplicationMock'searchBarText.append(character) // cannot use mutating member on immutable value: 'self' is immutablesearchBarText.removeLast() // cannot use mutating member on immutable value: 'self' is immutablefeedback = .success(city: searchBarText, forecast: forecast) // cannot assign to property: 'self' is immutablefeedback = .failure(city: searchBarText) // cannot assign to property: 'self' is immutableprotocol 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
private var searchString: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchString.append(character)
case .keyboardDeleteBackwards:
searchString.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchString)
return .success(city: searchString, forecast: forecast)
} catch {
return .failure(city: searchString)
}
}
return nil
}
}
class MockWeatherProvider: WeatherProvider {
var forecast: String?
func forecast(for city: String) throws -> String {
guard let forecast = forecast else {
throw WeatherError.noForecast
}
return forecast
}
}
class MockWeatherApplication: WeatherApplicationProtocol {
var provider: WeatherProvider
var searchString: String = ""
var feedback: ApplicationFeedback?
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchString.append(character)
case .keyboardDeleteBackwards:
searchString.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchString)
feedback = .success(city: searchString, forecast: forecast)
} catch {
feedback = .failure(city: searchString)
}
}
return feedback
}
}```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 searchString: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchString.append(character)
case .keyboardDeleteBackwards:
searchString.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchString)
return .success(city: searchString, forecast: forecast)
} catch {
return .failure(city: searchString)
}
}
return nil
}
}
// Mock provider to test application.
class MockWeatherProvider: WeatherProvider {
var forecast: String?
func forecast(for city: String) throws -> String {
guard let forecast = forecast else {
throw WeatherError.noForecast
}
return forecast
}
}
// Mock application to test application.
class MockWeatherApplication: WeatherApplicationProtocol {
var provider: WeatherProvider
var searchString: String = ""
var feedback: ApplicationFeedback?
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchString.append(character)
case .keyboardDeleteBackwards:
searchString.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchString)
feedback = .success(city: searchString, forecast: forecast)
} catch {
feedback = .failure(city: searchString)
}
}
return feedback
}
}
// Test application.
let mockProvider = MockWeatherProvider()
mockProvider.forecast = "Sunny"
let mockApplication = MockWeatherApplication(provider: mockProvider)
mockApplication.handle(action: .keyboardCharacterSelect("L"))
mockApplication.handle(action: .keyboardCharacterSelect("o"))
mockApplication.handle(action: .keyboardCharacterSelect("n"))
mockApplication.handle(action: .keyboardCharacterSelect("d"))
mockApplication.handle(action: .keyboardCharacterSelect("o"))
mockApplication.handle(action: .keyboardCharacterSelect("n"))
mockApplication.handle(action: .searchButtonPress)
print(mockApplication.feedback)
// Optional(success(city: "London", forecast: "Sunny"))
```throw WeatherError.noForecast // cannot find 'WeatherError' in scopeprotocol 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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
return nil
}
}
struct MockWeatherProvider: WeatherProvider {
let forecast: (String) -> String
func forecast(for city: String) throws -> String {
return forecast(city)
}
}
struct MockWeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
let handle: (UserAction) -> ApplicationFeedback?
init(provider: WeatherProvider, handle: @escaping (UserAction) -> ApplicationFeedback?) {
self.provider = provider
self.handle = handle
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handle(action)
}
}```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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText.append(character)
case .keyboardDeleteBackwards:
searchText.removeLast()
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
return nil
}
}
// Mock provider to test application.
struct MockWeatherProvider: WeatherProvider {
let forecast: (String) -> String
func forecast(for city: String) throws -> String {
return forecast(city)
}
}
// Mock application to test application.
struct MockWeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
let handle: (UserAction) -> ApplicationFeedback?
init(provider: WeatherProvider, handle: @escaping (UserAction) -> ApplicationFeedback?) {
self.provider = provider
self.handle = handle
}
func handle(action: UserAction) -> ApplicationFeedback? {
return handle(action)
}
}
// Test application.
func testWeatherApplication() {
let provider = MockWeatherProvider { city in
switch city {
case "London":
return "Cloudy"
case "Paris":
return "Sunny"
default:
throw NSError(domain: "", code: 0)
}
}
let application = MockWeatherApplication(provider: provider) { action in
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: "\(character)", forecast: "\(character)")
case .keyboardDeleteBackwards:
return .success(city: "", forecast: "")
case .searchButtonPress:
return .failure(city: "")
}
}
XCTAssertNil(application.handle(action: .keyboardCharacterSelect("L")))
XCTAssertNil(application.handle(action: .keyboardCharacterSelect("o")))
XCTAssertNil(application.handle(action: .keyboardCharacterSelect("n")))
XCTAssertNil(application.handle(action: .keyboardCharacterSelect("d")))
XCTAssertNil(application.handle(action: .keyboardCharacterSelect("o")))
XCTAssertNil(application.handle(action: .keyboardCharacterSelect("n")))
XCTAssertNil(application.handle(action: .searchButtonPress))
XCTAssertNil(application.handle(action: .keyboardDeleteBackwards))
XCTAssertNil(application.handle(action: .keyboardDeleteBackwards))
XCTAssertNil(application.handle(action: .keyboardDeleteBackwards))
XCTAssertNil(application.handle(action: .keyboardDeleteBackwards))
XCTAssertNil(application.handle(action: .keyboardDeleteBackwards))
XCTAssertNil(application.handle(action: .keyboardDeleteBackwards))
XCTAssertNil(application.handle(action: .keyboardDeleteBackwards))
XCTAssertNil(application.handle(action: .keyboardDeleteBackwards))
XCTAssertNil(application.handle(action: .keyboardDeleteBackwards))
XCTAssertNil(application.handle(action: .keyboardDeleteBackwards))
XCTAssertNil(application.handle(action: .keyboardDeleteBackwards))
XCTAssertNil(application.handle(action: .keyboardDeleteBackwards))
XCTAssertNil(application.handle(action: .keyboardDeleteBackwards))
XCTAssertNil(application.handle(action: .keyboardDeleteBackinit(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'struct MockWeatherApplication: WeatherApplicationProtocol { // type 'MockWeatherApplication' does not conform to protocol 'WeatherApplicationDependencies'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) {
self.balance = balance
}
nonisolated func deposit(amount: Double) async {
await withActor(self) {
balance += amount
}
}
nonisolated func withdraw(amount: Double) async -> Bool {
await withActor(self) {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
nonisolated var balance: Double {
get async {
await withActor(self) {
return balance
}
}
}
}```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) {
self.balance = balance
}
nonisolated func deposit(amount: Double) async {
await withActor(self) {
balance += amount
}
}
nonisolated func withdraw(amount: Double) async -> Bool {
await withActor(self) {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
nonisolated var balance: Double {
get async {
await withActor(self) {
return balance
}
}
}
}
// Example usage
let account = BankAccount(balance: 1000)
Task {
for _ in 1...100 {
await account.deposit(amount: 10)
}
}.resume()
Task {
for _ in 1...100 {
await account.withdraw(amount: 10)
}
}.resume()
print("Final balance:", await account.balance)
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'await withActor(self) { // cannot find 'withActor' in scopeawait withActor(self) { // cannot find 'withActor' in scopenonisolated var balance: Double { // invalid redeclaration of 'balance'await withActor(self) { // cannot find 'withActor' in scopeprotocol 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 init(balance: Double) {
self.balance = balance
}
public func deposit(amount: Double) async {
balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
}
return false
}
public var balance: Double {
get async {
return balance
}
}
}```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 init(balance: Double) {
self.balance = balance
}
public func deposit(amount: Double) async {
balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
}
return false
}
public var balance: Double {
get async {
return balance
}
}
}
// Example usage
let account = BankAccount(balance: 1000)
Task {
await account.deposit(amount: 500)
print("Balance after deposit: \(await account.balance)")
let success = await account.withdraw(amount: 200)
if success {
print("Withdrawal successful")
} else {
print("Insufficient funds")
}
print("Balance after withdrawal: \(await account.balance)")
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'public var balance: Double { // invalid redeclaration of 'balance'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
public init(balance: Double) {
self.balance = balance
}
public func deposit(amount: Double) async {
balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
public var balance: Double {
get async {
return balance
}
}
}
func makeTransaction(account: BankAccount) async {
let amount = 100.0
let result = await account.withdraw(amount: amount)
if result {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds. Current balance: \(await account.balance)")
}
}
func makeTransactionSync(account: BankAccount) {
let amount = 100.0
Task.detached {
let result = await account.withdraw(amount: amount)
if result {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds. Current balance: \(await account.balance)")
}
}
}```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 init(balance: Double) {
self.balance = balance
}
public func deposit(amount: Double) async {
balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
public var balance: Double {
get async {
return balance
}
}
}
// Asynchronous client code that interacts with the bank account using async/await
func makeTransaction(account: BankAccount) async {
let amount = 100.0
let result = await account.withdraw(amount: amount)
if result {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds. Current balance: \(await account.balance)")
}
}
// Synchronous client code that interacts with the bank account using async/await
func makeTransactionSync(account: BankAccount) {
let amount = 100.0
Task.detached {
let result = await account.withdraw(amount: amount)
if result {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds. Current balance: \(await account.balance)")
}
}
}
// Example usage
let account = BankAccount(balance: 500.0)
makeTransaction(account: account)
makeTransactionSync(account: account)
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'public var balance: Double { // invalid redeclaration of 'balance'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
public init(balance: Double) {
self.balance = balance
}
public func deposit(amount: Double) async {
balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
public var balance: Double {
get async {
return balance
}
}
}```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 init(balance: Double) {
self.balance = balance
}
public func deposit(amount: Double) async {
balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
public var balance: Double {
get async {
return balance
}
}
}
// Example usage
let account = BankAccount(balance: 1000)
Task {
await account.deposit(amount: 500)
print("Balance after deposit: \(await account.balance)")
let success = await account.withdraw(amount: 200)
if success {
print("Withdrawal successful")
} else {
print("Insufficient funds")
}
print("Balance after withdrawal: \(await account.balance)")
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'public var balance: Double { // invalid redeclaration of 'balance'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
public init(balance: Double) {
self.balance = balance
}
public func deposit(amount: Double) async {
balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
public var balance: Double {
get async {
return balance
}
}
}
func transferMoney(from account1: BankAccount, to account2: BankAccount, amount: Double) async {
let success = await account1.withdraw(amount: amount)
if success {
await account2.deposit(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 {
private var balance: Double
public init(balance: Double) {
self.balance = balance
}
public func deposit(amount: Double) async {
balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
public var balance: Double {
get async {
return balance
}
}
}
// Asynchronous function to transfer money between two bank accounts
func transferMoney(from account1: BankAccount, to account2: BankAccount, amount: Double) async {
let success = await account1.withdraw(amount: amount)
if success {
await account2.deposit(amount: amount)
}
}
// Example usage
let account1 = BankAccount(balance: 1000)
let account2 = BankAccount(balance: 500)
Task {
await transferMoney(from: account1, to: account2, amount: 500)
print("Transfer complete. Account 1 balance: \(await account1.balance), Account 2 balance: \(await account2.balance)")
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'public var balance: Double { // invalid redeclaration of 'balance'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
public init(balance: Double) {
self.balance = balance
}
public func deposit(amount: Double) async {
balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
public var balance: Double {
get async {
return balance
}
}
}
func performTransactions(account: BankAccount) async {
// Perform a deposit
await account.deposit(amount: 1000)
// Perform a withdrawal
let success = await account.withdraw(amount: 500)
if success {
print("Withdrawal successful")
} else {
print("Insufficient funds")
}
// Get the current balance
let currentBalance = await account.balance
print("Current balance: \(currentBalance)")
}```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 init(balance: Double) {
self.balance = balance
}
public func deposit(amount: Double) async {
balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
public var balance: Double {
get async {
return balance
}
}
}
// Asynchronous function to perform a series of transactions on a bank account
func performTransactions(account: BankAccount) async {
// Perform a deposit
await account.deposit(amount: 1000)
// Perform a withdrawal
let success = await account.withdraw(amount: 500)
if success {
print("Withdrawal successful")
} else {
print("Insufficient funds")
}
// Get the current balance
let currentBalance = await account.balance
print("Current balance: \(currentBalance)")
}
// Create a bank account and perform transactions
let account = BankAccount(balance: 1000)
Task {
await performTransactions(account: account)
}.start()
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'public var balance: Double { // invalid redeclaration of 'balance'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) {
self.balance = balance
}
func deposit(amount: Double) async {
await withActor(self) {
balance += amount
}
}
func withdraw(amount: Double) async -> Bool {
await withActor(self) {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
func getBalance() async -> Double {
await withActor(self) {
return balance
}
}
}```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) {
self.balance = balance
}
func deposit(amount: Double) async {
await withActor(self) {
balance += amount
}
}
func withdraw(amount: Double) async -> Bool {
await withActor(self) {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
func getBalance() async -> Double {
await withActor(self) {
return balance
}
}
}
// Example usage
let account = BankAccount(balance: 1000)
Task {
await account.deposit(amount: 500)
print("Balance after deposit: \(await account.getBalance())")
let success = await account.withdraw(amount: 200)
if success {
print("Withdrawal successful")
} else {
print("Insufficient funds")
}
print("Balance after withdrawal: \(await account.getBalance())")
}.resume()
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'await withActor(self) { // cannot find 'withActor' in scopeawait withActor(self) { // cannot find 'withActor' in scopeawait withActor(self) { // cannot find 'withActor' in scopeprotocol 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 init(balance: Double) {
self.balance = balance
}
public func deposit(amount: Double) async {
balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
}
return false
}
public var balance: Double {
get async {
return balance
}
}
}```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 init(balance: Double) {
self.balance = balance
}
public func deposit(amount: Double) async {
balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
}
return false
}
public var balance: Double {
get async {
return balance
}
}
}
// Example usage
let account = BankAccount(balance: 1000)
Task {
let result = await account.withdraw(amount: 500)
print("Withdrawal successful? \(result)")
print("Current balance: \(await account.balance)")
}
Task {
await account.deposit(amount: 200)
print("Current balance: \(await account.balance)")
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'public var balance: Double { // invalid redeclaration of 'balance'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
public init(balance: Double) {
_balance = balance
}
public var balance: Double {
get async {
return _balance
}
}
public func deposit(amount: Double) async {
_balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if _balance >= amount {
_balance -= amount
return true
} else {
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 init(balance: Double) {
_balance = balance
}
public var balance: Double {
get async {
return _balance
}
}
public func deposit(amount: Double) async {
_balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if _balance >= amount {
_balance -= amount
return true
} else {
return false
}
}
}
// Example usage
let account = BankAccount(balance: 1000)
Task {
let balance = await account.balance
print("Current balance: \(balance)")
await account.deposit(amount: 500)
print("Deposited 500")
let success = await account.withdraw(amount: 200)
if success {
print("Withdrew 200")
} else {
print("Insufficient funds")
}
let newBalance = await account.balance
print("New balance: \(newBalance)")
}
```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
public init(balance: Double) {
self._balance = balance
}
public var balance: Double {
get async {
return _balance
}
}
public func deposit(amount: Double) async {
_balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if _balance >= amount {
_balance -= amount
return true
} else {
return false
}
}
}
func makeTransaction(account: BankAccount, amount: Double) async {
if await account.withdraw(amount: amount) {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds.")
}
}```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 init(balance: Double) {
self._balance = balance
}
public var balance: Double {
get async {
return _balance
}
}
public func deposit(amount: Double) async {
_balance += amount
}
public func withdraw(amount: Double) async -> Bool {
if _balance >= amount {
_balance -= amount
return true
} else {
return false
}
}
}
// Asynchronous client code that interacts with the BankAccount class using async/await syntax.
func makeTransaction(account: BankAccount, amount: Double) async {
if await account.withdraw(amount: amount) {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds.")
}
}
// Create a new bank account and make a transaction.
let account = BankAccount(balance: 1000)
Task.detached(priority: .high) {
await makeTransaction(account: account, amount: 500)
}
```protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value
private let wrappedValue: () -> Value
private let condition: () -> Bool
init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value
}
set {
value = newValue
}
}
var projectedValue: Value {
get {
if condition() {
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 let wrappedValue: () -> Value
private let condition: () -> Bool
init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value
}
set {
value = newValue
}
}
var projectedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value
}
set {
value = newValue
}
}
}
```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 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 wrappedValue: () -> Value
private let condition: () -> Bool
public init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
public var wrappedValue: Value {
get {
if self.value == nil || !self.condition() {
self.value = self.wrappedValue()
}
return self.value!
}
set {
self.value = newValue
}
}
public var projectedValue: Cached<Value> {
get { self }
set { self = 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 wrappedValue: () -> Value
private let condition: () -> Bool
public init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
public var wrappedValue: Value {
get {
if self.value == nil || !self.condition() {
self.value = self.wrappedValue()
}
return self.value!
}
set {
self.value = newValue
}
}
public var projectedValue: Cached<Value> {
get { self }
set { self = newValue }
}
}
```struct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'public var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'self.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 {
var value: Value
var wrappedValue: @autoclosure () -> Value
var condition: () -> Bool
var cached: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
self.cached = false
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if !cached || condition() {
value = wrappedValue()
cached = true
}
return value
}
set {
value = newValue
cached = true
}
}
}```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 value: Value
var wrappedValue: @autoclosure () -> Value
var condition: () -> Bool
var cached: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
self.cached = false
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if !cached || condition() {
value = wrappedValue()
cached = true
}
return value
}
set {
value = newValue
cached = true
}
}
}
```struct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'var wrappedValue: @autoclosure () -> Value // '@autoclosure' may only be used on parametersself.wrappedValue = wrappedValue // function produces expected type 'Value'; did you mean to call it with '()'?value = wrappedValue() // cannot call value of non-function type 'Value'value = wrappedValue() // cannot assign to property: 'self' is immutablecached = true // cannot assign to property: 'self' is immutableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value
let condition: () -> Bool
private var cachedValue: Value?
private var cachedCondition: Bool?
init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue()
self.condition = condition
}
var value: Value {
if cachedCondition != condition() {
cachedValue = wrappedValue
cachedCondition = condition()
}
return cachedValue ?? wrappedValue
}
}
struct MyStruct {
@Cached var myProperty: Int {
return Int.random(in: 1...100)
}
}```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
let condition: () -> Bool
private var cachedValue: Value?
private var cachedCondition: Bool?
init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue()
self.condition = condition
}
var value: Value {
if cachedCondition != condition() {
cachedValue = wrappedValue
cachedCondition = condition()
}
return cachedValue ?? wrappedValue
}
}
// Example usage
struct MyStruct {
@Cached var myProperty: Int {
return Int.random(in: 1...100)
}
}
let myStruct = MyStruct()
print(myStruct.myProperty) // Prints a random integer
print(myStruct.myProperty) // Prints the same integer as before
// Change the condition
myStruct.myProperty = 100
print(myStruct.myProperty) // Prints a new random integer
```cachedValue = wrappedValue // cannot assign to property: 'self' is immutablecachedCondition = condition() // cannot assign to property: 'self' is immutable@Cached var myProperty: Int { // property wrapper cannot be applied to a computed propertyreturn value // cannot convert value of type 'Int' to closure result type '() -> Int'protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var wrappedValue: () -> Value
private var condition: () -> Bool
private var cachedValue: Value?
init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var value: Value {
if cachedValue == nil || condition() {
cachedValue = wrappedValue()
}
return cachedValue!
}
}
struct MyStruct {
@Cached var expensiveComputation: Int {
// Perform expensive computation here
return Int.random(in: 0...100)
}
@Cached(condition: { self.expensiveComputation > 50 }) var expensiveComputation2: Int {
// Perform expensive computation here
return Int.random(in: 0...100)
}
}```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 wrappedValue: () -> Value
private var condition: () -> Bool
private var cachedValue: Value?
init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var value: Value {
if cachedValue == nil || condition() {
cachedValue = wrappedValue()
}
return cachedValue!
}
}
// Example usage
struct MyStruct {
@Cached var expensiveComputation: Int {
// Perform expensive computation here
return Int.random(in: 0...100)
}
@Cached(condition: { self.expensiveComputation > 50 }) var expensiveComputation2: Int {
// Perform expensive computation here
return Int.random(in: 0...100)
}
}
```private var wrappedValue: () -> Value // private property 'wrappedValue' cannot have more restrictive access than its enclosing property wrapper type 'Cached' (which is internal)cachedValue = wrappedValue() // cannot assign to property: 'self' is immutable@Cached var expensiveComputation: Int { // property wrapper cannot be applied to a computed property@Cached(condition: { self.expensiveComputation > 50 }) var expensiveComputation2: Int { // variable with getter/setter cannot have an initial value@Cached(condition: { self.expensiveComputation > 50 }) var expensiveComputation2: Int { // cannot find 'self' in scope; did you mean to use it in a type or extension context?@Cached(condition: { self.expensiveComputation > 50 }) var expensiveComputation2: Int { // property wrapper cannot be applied to a computed propertyprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value
private let wrappedValue: () -> Value
private let condition: () -> Bool
init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value
}
var projectedValue: Value {
get { 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 wrappedValue: () -> Value
private let condition: () -> Bool
init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value
}
var projectedValue: Value {
get { wrappedValue }
set { value = newValue }
}
}
```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 immutableget { 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 {
var wrappedValue: Value
var condition: () -> Bool
var cachedValue: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue()
self.condition = condition
self.cachedValue = nil
}
var value: Value {
get {
if self.condition() {
self.cachedValue = self.wrappedValue
}
return self.cachedValue ?? self.wrappedValue
}
set {
self.wrappedValue = newValue
self.cachedValue = 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 {
var wrappedValue: Value
var condition: () -> Bool
var cachedValue: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue()
self.condition = condition
self.cachedValue = nil
}
var value: Value {
get {
if self.condition() {
self.cachedValue = self.wrappedValue
}
return self.cachedValue ?? self.wrappedValue
}
set {
self.wrappedValue = newValue
self.cachedValue = newValue
}
}
}
```self.cachedValue = 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 {
private var value: Value
private let wrappedValue: () -> Value
private let condition: () -> Bool
private var cached: Bool = false
public init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
self.value = wrappedValue()
self.cached = true
}
public var wrappedValue: Value {
get {
if !cached || !condition() {
value = wrappedValue()
cached = true
}
return value
}
set {
value = newValue
cached = true
}
}
public var projectedValue: Binding<Value> {
get {
if !cached || !condition() {
value = wrappedValue()
cached = true
}
return Binding<Value>(
get: { value },
set: { newValue in
value = newValue
cached = true
}
)
}
}
}```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 wrappedValue: () -> Value
private let condition: () -> Bool
private var cached: Bool = false
public init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
self.value = wrappedValue()
self.cached = true
}
public var wrappedValue: Value {
get {
if !cached || !condition() {
value = wrappedValue()
cached = true
}
return value
}
set {
value = newValue
cached = true
}
}
public var projectedValue: Binding<Value> {
get {
if !cached || !condition() {
value = wrappedValue()
cached = true
}
return Binding<Value>(
get: { value },
set: { newValue in
value = newValue
cached = true
}
)
}
}
}
```struct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'public var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutablecached = true // cannot assign to property: 'self' is immutablepublic var projectedValue: Binding<Value> { // cannot find type 'Binding' in scopevalue = wrappedValue() // cannot assign to property: 'self' is immutablecached = true // 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 conditionValue: Bool
public init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition
self.conditionValue = condition()
}
public var wrappedValue: Value {
get {
if condition() != conditionValue {
value = wrappedValue()
conditionValue = condition()
}
return value
}
set {
value = newValue
}
}
}
struct MyStruct {
@Cached var cachedValue: Int {
return Int.random(in: 1...100)
}
}```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 conditionValue: Bool
public init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition
self.conditionValue = condition()
}
public var wrappedValue: Value {
get {
if condition() != conditionValue {
value = wrappedValue()
conditionValue = condition()
}
return value
}
set {
value = newValue
}
}
}
// Example usage
struct MyStruct {
@Cached var cachedValue: Int {
return Int.random(in: 1...100)
}
}
let myStruct = MyStruct()
print(myStruct.cachedValue) // prints a random integer
print(myStruct.cachedValue) // prints the same integer as before
// Change the condition to force recomputation
myStruct.cachedValue = 0
print(myStruct.cachedValue) // prints a new random integer
```value = wrappedValue() // cannot assign to property: 'self' is immutablevalue = wrappedValue() // cannot call value of non-function type 'Value'conditionValue = condition() // cannot assign to property: 'self' is immutable@Cached var cachedValue: Int { // property wrapper cannot be applied to a computed propertyreturn value // cannot convert value of type 'Int' to closure result type '() -> Int'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
private var conditionValue: Bool
init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition
self.conditionValue = condition()
}
var wrappedValue: Value {
get {
if self.condition() != self.conditionValue {
self.value = self.wrappedValue
self.conditionValue = self.condition()
}
return self.value
}
set {
self.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 conditionValue: Bool
init(wrappedValue: @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition
self.conditionValue = condition()
}
var wrappedValue: Value {
get {
if self.condition() != self.conditionValue {
self.value = self.wrappedValue
self.conditionValue = self.condition()
}
return self.value
}
set {
self.value = newValue
}
}
}
```self.value = self.wrappedValue // cannot assign to property: 'self' is immutableself.conditionValue = self.condition() // cannot assign to property: 'self' is immutablereturn value // cannot convert value of type 'Int' to closure result type '() -> Int'infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: right
higherThan: EqualityPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
func addOne(_ x: Int) -> Int {
return x + 1
}
func double(_ x: Int) -> Int {
return x * 2
}```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: right
higherThan: EqualityPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage
func addOne(_ x: Int) -> Int {
return x + 1
}
func double(_ x: Int) -> Int {
return x * 2
}
let addOneAndDouble = addOne >>> double
print(addOneAndDouble(3)) // Output: 8
```higherThan: EqualityPrecedence // unknown precedence group 'EqualityPrecedence'infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: right
higherThan: FunctionApplicationPrecedence
}
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: right
higherThan: FunctionApplicationPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
```higherThan: FunctionApplicationPrecedence // unknown precedence group 'FunctionApplicationPrecedence'infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: right
higherThan: FunctionCompositionPrecedence
}
func >>> <T, U, V>(lhs: @escaping (T) -> U, rhs: @escaping (U) -> V) -> (T) -> V {
return { lhs(rhs($0)) }
}
func addOne(x: Int) -> Int {
return x + 1
}
func double(x: Int) -> Int {
return x * 2
}```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: right
higherThan: FunctionCompositionPrecedence
}
func >>> <T, U, V>(lhs: @escaping (T) -> U, rhs: @escaping (U) -> V) -> (T) -> V {
return { lhs(rhs($0)) }
}
// Example usage
func addOne(x: Int) -> Int {
return x + 1
}
func double(x: Int) -> Int {
return x * 2
}
let addOneAndDouble = addOne >>> double
print(addOneAndDouble(3)) // Output: 8
```higherThan: FunctionCompositionPrecedence // cycle in 'higherThan' relationreturn { lhs(rhs($0)) } // cannot convert value of type 'U' to closure result type 'V'return { lhs(rhs($0)) } // cannot convert value of type 'T' to expected argument type 'U'return { lhs(rhs($0)) } // cannot convert value of type 'V' to expected argument type 'T'infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: FunctionCompositionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
func addOne(_ x: Int) -> Int {
return x + 1
}
func double(_ x: Int) -> Int {
return x * 2
}```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: FunctionCompositionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage
func addOne(_ x: Int) -> Int {
return x + 1
}
func double(_ x: Int) -> Int {
return x * 2
}
let addOneAndDouble = addOne >>> double
let result = addOneAndDouble(3) // result is 8 (3 + 1 = 4, then 4 * 2 = 8)
```higherThan: FunctionCompositionPrecedence // cycle in 'higherThan' relationinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: right
higherThan: FunctionCompositionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}
func addOne(_ x: Int) -> Int {
return x + 1
}
func double(_ x: Int) -> Int {
return x * 2
}```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: right
higherThan: FunctionCompositionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}
// Example usage:
func addOne(_ x: Int) -> Int {
return x + 1
}
func double(_ x: Int) -> Int {
return x * 2
}
let composedFunction = addOne >>> double
print(composedFunction(2)) // Output: 6
```higherThan: FunctionCompositionPrecedence // cycle in 'higherThan' relationinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: right
higherThan: FunctionApplicationPrecedence
}
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: right
higherThan: FunctionApplicationPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
```higherThan: FunctionApplicationPrecedence // unknown precedence group 'FunctionApplicationPrecedence'infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: right
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
func addOne(_ x: Int) -> Int {
return x + 1
}
func double(_ x: Int) -> Int {
return x * 2
}```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: right
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
func addOne(_ x: Int) -> Int {
return x + 1
}
func double(_ x: Int) -> Int {
return x * 2
}
let addOneAndDouble = addOne >>> double
let result = addOneAndDouble(3) // result is 8
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: right
}
func >>> <T, U, V>(f: @escaping (T) -> U, g: @escaping (U) -> V) -> (T) -> V {
return { x in g(f(x)) }
}
func addOne(_ x: Int) -> Int {
return x + 1
}
func double(_ x: Int) -> Int {
return x * 2
}```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: right
}
func >>> <T, U, V>(f: @escaping (T) -> U, g: @escaping (U) -> V) -> (T) -> V {
return { x in g(f(x)) }
}
// Example usage:
func addOne(_ x: Int) -> Int {
return x + 1
}
func double(_ x: Int) -> Int {
return x * 2
}
let addOneAndDouble = addOne >>> double
let result = addOneAndDouble(3) // result is 8 (3 + 1 = 4, then 4 * 2 = 8)
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: right
}
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: right
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
let addOne = { (x: Int) -> Int in x + 1 }
let double = { (x: Int) -> Int in x * 2 }
let addOneAndDouble = addOne >>> double
print(addOneAndDouble(3)) // Output: 8
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: right
}
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: right
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
let addOne = { (x: Int) -> Int in x + 1 }
let double = { (x: Int) -> Int in x * 2 }
let addOneAndDouble = addOne >>> double
let result = addOneAndDouble(3) // result is 8 (3 + 1 = 4, then 4 * 2 = 8)
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(buffer.prefix(bytesRead))
}
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 {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(buffer.prefix(bytesRead))
}
return digest
}
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(buffer.prefix(bytesRead))
}
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 {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(buffer.prefix(bytesRead))
}
return digest
}
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(buffer.prefix(bytesRead))
}
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 {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(buffer.prefix(bytesRead))
}
return digest
}
// Example usage:
let inputStream = InputStream(fileAtPath: "/path/to/file.txt")!
let hash = computeSHA256Hash(of: inputStream, bufferSize: 4096)
print(hash.description)
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(bytes: buffer, count: bytesRead)
}
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 {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(bytes: buffer, count: bytesRead)
}
return digest
}
// Example usage:
let inputStream = InputStream(fileURL: URL(fileURLWithPath: "/path/to/file"))!
let bufferSize = 1024
let hash = computeSHA256Hash(of: inputStream, bufferSize: bufferSize)
print(hash.description)
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(bytes: buffer.prefix(bytesRead))
}
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 {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(bytes: buffer.prefix(bytesRead))
}
return digest
}
// Example usage:
let inputStream = InputStream(fileAtPath: "/path/to/file")!
let bufferSize = 1024
let hash = computeSHA256Hash(of: inputStream, bufferSize: bufferSize)
print("SHA-256 hash of file: \(hash.description)")
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(buffer.prefix(bytesRead))
}
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 {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(buffer.prefix(bytesRead))
}
return digest
}
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var digest = SHA256Digest()
let buffer = UnsafeMutableRawPointer.allocate(byteCount: bufferSize, alignment: 1)
defer { buffer.deallocate() }
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
digest.update(buffer.assumingMemoryBound(to: UInt8.self), count: bytesRead)
}
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 {
var digest = SHA256Digest()
let buffer = UnsafeMutableRawPointer.allocate(byteCount: bufferSize, alignment: 1)
defer { buffer.deallocate() }
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
digest.update(buffer.assumingMemoryBound(to: UInt8.self), count: bytesRead)
}
return digest
}
// Example usage:
let inputStream = InputStream(fileAtPath: "/path/to/file")!
let bufferSize = 1024
let sha256Hash = computeSHA256Hash(of: inputStream, bufferSize: bufferSize)
print(sha256Hash.hexString)
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var digest = SHA256Digest()
let buffer = UnsafeMutableRawBufferPointer.allocate(capacity: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
digest.update(buffer.advanced(by: bytesRead))
}
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 {
var digest = SHA256Digest()
let buffer = UnsafeMutableRawBufferPointer.allocate(capacity: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
digest.update(buffer.advanced(by: bytesRead))
}
return digest
}
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializerslet buffer = UnsafeMutableRawBufferPointer.allocate(capacity: bufferSize) // incorrect argument label in call (have 'capacity:', expected 'count:')import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(bytes: buffer, count: bytesRead)
}
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 {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(bytes: buffer, count: bytesRead)
}
return digest
}
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(buffer.prefix(bytesRead))
}
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 {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
digest.update(buffer.prefix(bytesRead))
}
return digest
}
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializerstypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var chars = [Character]()
var i = 0
while tuple16[i] != 0 {
chars.append(Character(ascii: Int8(tuple16[i])!))
i += 1
}
self.init(chars)
}
}```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 chars = [Character]()
var i = 0
while tuple16[i] != 0 {
chars.append(Character(ascii: Int8(tuple16[i])!))
i += 1
}
self.init(chars)
}
}
// Example usage:
let tuple16 = ("Hello".utf8CString)[0...15]
let str = String(tuple16: tuple16)
print(str) // Output: "Hello"
```while tuple16[i] != 0 { // 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 insteadchars.append(Character(ascii: Int8(tuple16[i])!)) // no exact matches in call to initializerchars.append(Character(ascii: Int8(tuple16[i])!)) // 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 insteadtypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self = String(cString: &tuple16, encoding: String.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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
let tuple16 = ("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "\0")
let string = String(tuple16: tuple16)
print(string)
// Prints "abcdefghijklmn"
```self = String(cString: &tuple16, encoding: String.Encoding.ascii)! // cannot pass immutable value as inout argument: 'tuple16' is a 'let' constantself = String(cString: &tuple16, encoding: String.Encoding.ascii)! // 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 = String(cString: &tuple16, encoding: String.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) {
self = String(cString: &tuple16, encoding: String.Encoding.utf8)!
}
}
let tuple16 = (0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x00)
let string = String(tuple16: tuple16)
print(string)
// Prints "abcdefghijklmno"
```self = String(cString: &tuple16, encoding: String.Encoding.utf8)! // no exact matches in call to initializerself = String(cString: &tuple16, encoding: String.Encoding.utf8)! // cannot pass immutable value as inout argument: 'tuple16' is a 'let' constanttypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self = String(cString: &tuple16, encoding: String.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) {
self = String(cString: &tuple16, encoding: String.Encoding.utf8)!
}
}
let tuple16 = (0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x00, 0x00, 0x00, 0x00, 0x00)
let str = String(tuple16: tuple16)
print(str)
// Prints "hello world"
```self = String(cString: &tuple16, encoding: String.Encoding.utf8)! // no exact matches in call to initializerself = String(cString: &tuple16, encoding: String.Encoding.utf8)! // cannot pass immutable value as inout argument: 'tuple16' is a 'let' constanttypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self = String(cString: &tuple16, encoding: String.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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
// 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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
// 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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
// 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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
// 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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
// 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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
// 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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
// 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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
// 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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
// 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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
// 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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
// 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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
// 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 =self = String(cString: &tuple16, encoding: String.Encoding.ascii)! // cannot pass immutable value as inout argument: 'tuple16' is a 'let' constantself = String(cString: &tuple16, encoding: String.Encoding.ascii)! // 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 = String(cString: &tuple16, encoding: String.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 = String(cString: &tuple16, encoding: String.Encoding.ascii)!
}
}
let tuple16 = (97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112)
let str = String(tuple16: tuple16)
print(str)
// Prints "abcdefghijklmnop"
```self = String(cString: &tuple16, encoding: String.Encoding.ascii)! // cannot pass immutable value as inout argument: 'tuple16' is a 'let' constantself = String(cString: &tuple16, encoding: String.Encoding.ascii)! // 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 chars: [Character] = []
for i in 0..<16 {
let char = Character(UnicodeScalar(tuple16.element(at: i) & 0xFF))
if char == "\0" { break }
chars.append(char)
}
self.init(chars)
}
}```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 chars: [Character] = []
for i in 0..<16 {
let char = Character(UnicodeScalar(tuple16.element(at: i) & 0xFF))
if char == "\0" { break }
chars.append(char)
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i in 0..<16 {
let char = Character(UnicodeScalar(tuple16.element(at: i) & 0xFF))
if char == "\0" { break }
chars.append(char)
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i in 0..<16 {
let char = Character(UnicodeScalar(tuple16.element(at: i) & 0xFF))
if char == "\0" { break }
chars.append(char)
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i in 0..<16 {
let char = Character(UnicodeScalar(tuple16.element(at: i) & 0xFF))
if char == "\0" { break }
chars.append(char)
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i in 0..<16 {
let char = Character(UnicodeScalar(tuple16.element(at: i) & 0xFF))
if char == "\0" { break }
chars.append(char)
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i in 0..<16 {
let char = Character(UnicodeScalar(tuple16.element(at: i) & 0xFF))
if char == "\0" { break }
chars.append(char)
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i in 0..<16 {
let char = Character(UnicodeScalar(tuple16.element(at: i) & 0xFF))
if char == "\0" { break }
chars.append(char)
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i inlet char = Character(UnicodeScalar(tuple16.element(at: i) & 0xFF)) // 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 'element'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var chars = [Character]()
var i = 0
while tuple16[i] != 0 {
chars.append(Character(ascii: Int8(tuple16[i])!))
i += 1
}
self.init(chars)
}
}```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 chars = [Character]()
var i = 0
while tuple16[i] != 0 {
chars.append(Character(ascii: Int8(tuple16[i])!))
i += 1
}
self.init(chars)
}
}
let tuple16 = ("h", "e", "l", "l", "o", "\0", "w", "o", "r", "l", "d", "\0", "\0", "\0", "\0", "\0")
let str = String(tuple16: tuple16)
print(str)
// Prints "hello"
```while tuple16[i] != 0 { // 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 insteadchars.append(Character(ascii: Int8(tuple16[i])!)) // no exact matches in call to initializerchars.append(Character(ascii: Int8(tuple16[i])!)) // 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 insteadtypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var chars = [Character]()
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}```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 chars = [Character]()
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars = [Character]()
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars = [Character]()
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars = [Character]()
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars = [Character]()
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars = [Character]()
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars = [Character]()
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars = [Character]()
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(if tuple16[i] == 0 { break } // 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 insteadchars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F))) // 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 insteadtypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var chars: [Character] = []
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}```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 chars: [Character] = []
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i in 0..<16 {
if tuple16[i] == 0 { break }
chars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F)))
}
self.init(chars)
}
}
// 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 chars: [Character] = []
for i in 0..<16 {
if tuple16[i] == 0 {if tuple16[i] == 0 { break } // 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 insteadchars.append(Character(UnicodeScalar(UInt8(tuple16[i]) & 0x7F))) // 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 insteadimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
// Check if two pixel buffers have same size.
if lhs.width != rhs.width || lhs.height != rhs.height {
return false
}
// Check if two pixel buffers have same pixel format.
if lhs.pixelFormatType != rhs.pixelFormatType {
return false
}
// Check if two pixel buffers have same content.
let lhsBytes = lhs.baseAddress!.assumingMemoryBound(to: UInt8.self)
let rhsBytes = rhs.baseAddress!.assumingMemoryBound(to: UInt8.self)
let bytesCount = lhs.bytesPerRow * lhs.height
return lhsBytes.advanced(by: 0).pointee == rhsBytes.advanced(by: 0).pointee
}```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 {
// Check if two pixel buffers have same size.
if lhs.width != rhs.width || lhs.height != rhs.height {
return false
}
// Check if two pixel buffers have same pixel format.
if lhs.pixelFormatType != rhs.pixelFormatType {
return false
}
// Check if two pixel buffers have same content.
let lhsBytes = lhs.baseAddress!.assumingMemoryBound(to: UInt8.self)
let rhsBytes = rhs.baseAddress!.assumingMemoryBound(to: UInt8.self)
let bytesCount = lhs.bytesPerRow * lhs.height
return lhsBytes.advanced(by: 0).pointee == rhsBytes.advanced(by: 0).pointee
}
```if lhs.width != rhs.width || lhs.height != rhs.height { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width != rhs.width || lhs.height != rhs.height { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width != rhs.width || lhs.height != rhs.height { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width != rhs.width || lhs.height != rhs.height { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.pixelFormatType != rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'if lhs.pixelFormatType != rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'let lhsBytes = lhs.baseAddress!.assumingMemoryBound(to: UInt8.self) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'baseAddress'let rhsBytes = rhs.baseAddress!.assumingMemoryBound(to: UInt8.self) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'baseAddress'let bytesCount = lhs.bytesPerRow * lhs.height // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'let bytesCount = lhs.bytesPerRow * lhs.height // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.isEqual(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.isEqual(rhs)
}
```return lhs.isEqual(rhs) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'isEqual'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
// Check if the pixel buffers are the same object.
if lhs === rhs {
return true
}
// Check if the pixel buffers have the same size, pixel format, and content.
return lhs.isEqualTo(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 {
// Check if the pixel buffers are the same object.
if lhs === rhs {
return true
}
// Check if the pixel buffers have the same size, pixel format, and content.
return lhs.isEqualTo(rhs)
}
```return lhs.isEqualTo(rhs) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'isEqualTo'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
// Check if the pixel buffers are the same object.
if lhs === rhs { return true }
// Check if the pixel buffers are the same size.
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
if lhsWidth != rhsWidth || lhsHeight != rhsHeight { return false }
// Check if the pixel buffers are the same format.
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
if lhsPixelFormat != rhsPixelFormat { return false }
// Check if the pixel buffers are the same content.
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsBytesPerImage = CVPixelBufferGetBytesPerRow(lhs) * CVPixelBufferGetHeight(lhs)
let rhsBytesPerImage = CVPixelBufferGetBytesPerRow(rhs) * CVPixelBufferGetHeight(rhs)
if lhsBytesPerRow != rhsBytesPerRow || lhsBytesPerImage != rhsBytesPerImage { return false }
// Get the pixel buffer data pointers.
var lhsBaseAddress: UnsafeMutableRawPointer?
var lhsBytesPerRow: Int32 = 0
CVPixelBufferLockBaseAddress(lhs, CVPixelBufferLockFlags(0))
CVPixelBufferGetBaseAddressAndBytesPerRow(lhs, &lhsBaseAddress, &lhsBytesPerRow)
defer { CVPixelBufferUnlockBaseAddress(lhs, CVPixelBufferLockFlags(0)) }
var rhsBaseAddress: UnsafeMutableRawPointer?
var rhsBytesPerRow: Int32 = 0
CVPixelBufferLockBaseAddress(rhs, CVPixelBufferLockFlags(0))
CVPixelBufferGetBaseAddressAndBytesPerRow(rhs, &rhsBaseAddress, &rhsBytesPerRow)
defer { CVPixelBufferUnlockBaseAddress(rhs, CVPixelBufferLockFlags(0)) }
// Compare the pixel buffer data.
let lhsData = lhsBaseAddress!.assumingMemoryBoundTo(CVPixelBuffer.self)
let rhsData = rhsBaseAddress!.assumingMemoryBoundTo(CVPixelBuffer.self)
return lhsData == rhsData
}```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 {
// Check if the pixel buffers are the same object.
if lhs === rhs { return true }
// Check if the pixel buffers are the same size.
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
if lhsWidth != rhsWidth || lhsHeight != rhsHeight { return false }
// Check if the pixel buffers are the same format.
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
if lhsPixelFormat != rhsPixelFormat { return false }
// Check if the pixel buffers are the same content.
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsBytesPerImage = CVPixelBufferGetBytesPerRow(lhs) * CVPixelBufferGetHeight(lhs)
let rhsBytesPerImage = CVPixelBufferGetBytesPerRow(rhs) * CVPixelBufferGetHeight(rhs)
if lhsBytesPerRow != rhsBytesPerRow || lhsBytesPerImage != rhsBytesPerImage { return false }
// Get the pixel buffer data pointers.
var lhsBaseAddress: UnsafeMutableRawPointer?
var lhsBytesPerRow: Int32 = 0
CVPixelBufferLockBaseAddress(lhs, CVPixelBufferLockFlags(0))
CVPixelBufferGetBaseAddressAndBytesPerRow(lhs, &lhsBaseAddress, &lhsBytesPerRow)
defer { CVPixelBufferUnlockBaseAddress(lhs, CVPixelBufferLockFlags(0)) }
var rhsBaseAddress: UnsafeMutableRawPointer?
var rhsBytesPerRow: Int32 = 0
CVPixelBufferLockBaseAddress(rhs, CVPixelBufferLockFlags(0))
CVPixelBufferGetBaseAddressAndBytesPerRow(rhs, &rhsBaseAddress, &rhsBytesPerRow)
defer { CVPixelBufferUnlockBaseAddress(rhs, CVPixelBufferLockFlags(0)) }
// Compare the pixel buffer data.
let lhsData = lhsBaseAddress!.assumingMemoryBoundTo(CVPixelBuffer.self)
let rhsData = rhsBaseAddress!.assumingMemoryBoundTo(CVPixelBuffer.self)
return lhsData == rhsData
}
```var lhsBytesPerRow: Int32 = 0 // invalid redeclaration of 'lhsBytesPerRow'CVPixelBufferLockBaseAddress(lhs, CVPixelBufferLockFlags(0)) // missing argument label 'rawValue:' in callCVPixelBufferGetBaseAddressAndBytesPerRow(lhs, &lhsBaseAddress, &lhsBytesPerRow) // cannot find 'CVPixelBufferGetBaseAddressAndBytesPerRow' in scopedefer { CVPixelBufferUnlockBaseAddress(lhs, CVPixelBufferLockFlags(0)) } // missing argument label 'rawValue:' in callvar rhsBytesPerRow: Int32 = 0 // invalid redeclaration of 'rhsBytesPerRow'CVPixelBufferLockBaseAddress(rhs, CVPixelBufferLockFlags(0)) // missing argument label 'rawValue:' in callCVPixelBufferGetBaseAddressAndBytesPerRow(rhs, &rhsBaseAddress, &rhsBytesPerRow) // cannot find 'CVPixelBufferGetBaseAddressAndBytesPerRow' in scopedefer { CVPixelBufferUnlockBaseAddress(rhs, CVPixelBufferLockFlags(0)) } // missing argument label 'rawValue:' in calllet lhsData = lhsBaseAddress!.assumingMemoryBoundTo(CVPixelBuffer.self) // value of type 'UnsafeMutableRawPointer' has no member 'assumingMemoryBoundTo'let rhsData = rhsBaseAddress!.assumingMemoryBoundTo(CVPixelBuffer.self) // value of type 'UnsafeMutableRawPointer' has no member 'assumingMemoryBoundTo'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
// Check if two pixel buffers have the same size.
if lhs.width != rhs.width || lhs.height != rhs.height {
return false
}
// Check if two pixel buffers have the same pixel format.
if lhs.pixelFormatType != rhs.pixelFormatType {
return false
}
// Check if two pixel buffers have the same content.
let lhsBytesPerRow = lhs.bytesPerRow
let rhsBytesPerRow = rhs.bytesPerRow
let lhsBytesPerImage = lhs.width * lhs.height * lhs.bitsPerPixel / 8
let rhsBytesPerImage = rhs.width * rhs.height * rhs.bitsPerPixel / 8
if lhsBytesPerImage != rhsBytesPerImage {
return false
}
// Check if two pixel buffers have the same content.
let lhsBytesPerPlane = lhsBytesPerImage / lhs.planes.count
let rhsBytesPerPlane = rhsBytesPerImage / rhs.planes.count
if lhsBytesPerPlane != rhsBytesPerPlane {
return false
}
// Check if two pixel buffers have the same content.
for (index, lhsPlane) in lhs.planes.enumerated() {
let rhsPlane = rhs.planes[index]
let lhsBytes = lhsPlane.bytes
let rhsBytes = rhsPlane.bytes
if lhsBytes.count != rhsBytes.count {
return false
}
for i in 0..<lhsBytes.count {
if lhsBytes[i] != rhsBytes[i] {
return false
}
}
}
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 {
// Check if two pixel buffers have the same size.
if lhs.width != rhs.width || lhs.height != rhs.height {
return false
}
// Check if two pixel buffers have the same pixel format.
if lhs.pixelFormatType != rhs.pixelFormatType {
return false
}
// Check if two pixel buffers have the same content.
let lhsBytesPerRow = lhs.bytesPerRow
let rhsBytesPerRow = rhs.bytesPerRow
let lhsBytesPerImage = lhs.width * lhs.height * lhs.bitsPerPixel / 8
let rhsBytesPerImage = rhs.width * rhs.height * rhs.bitsPerPixel / 8
if lhsBytesPerImage != rhsBytesPerImage {
return false
}
// Check if two pixel buffers have the same content.
let lhsBytesPerPlane = lhsBytesPerImage / lhs.planes.count
let rhsBytesPerPlane = rhsBytesPerImage / rhs.planes.count
if lhsBytesPerPlane != rhsBytesPerPlane {
return false
}
// Check if two pixel buffers have the same content.
for (index, lhsPlane) in lhs.planes.enumerated() {
let rhsPlane = rhs.planes[index]
let lhsBytes = lhsPlane.bytes
let rhsBytes = rhsPlane.bytes
if lhsBytes.count != rhsBytes.count {
return false
}
for i in 0..<lhsBytes.count {
if lhsBytes[i] != rhsBytes[i] {
return false
}
}
}
return true
}
```if lhs.width != rhs.width || lhs.height != rhs.height { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width != rhs.width || lhs.height != rhs.height { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width != rhs.width || lhs.height != rhs.height { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width != rhs.width || lhs.height != rhs.height { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.pixelFormatType != rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'if lhs.pixelFormatType != rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'let lhsBytesPerRow = lhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'let rhsBytesPerRow = rhs.bytesPerRow // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'let lhsBytesPerImage = lhs.width * lhs.height * lhs.bitsPerPixel / 8 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bitsPerPixel'let lhsBytesPerImage = lhs.width * lhs.height * lhs.bitsPerPixel / 8 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'let lhsBytesPerImage = lhs.width * lhs.height * lhs.bitsPerPixel / 8 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'let rhsBytesPerImage = rhs.width * rhs.height * rhs.bitsPerPixel / 8 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'let rhsBytesPerImage = rhs.width * rhs.height * rhs.bitsPerPixel / 8 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'let rhsBytesPerImage = rhs.width * rhs.height * rhs.bitsPerPixel / 8 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bitsPerPixel'let lhsBytesPerPlane = lhsBytesPerImage / lhs.planes.count // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'planes'let rhsBytesPerPlane = rhsBytesPerImage / rhs.planes.count // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'planes'for (index, lhsPlane) in lhs.planes.enumerated() { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'planes'let rhsPlane = rhs.planes[index] // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'planes'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return lhs.isEqual(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.isEqual(rhs)
}
```return lhs.isEqual(rhs) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'isEqual'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
// Check if the pixel buffers have the same size.
if lhs.width != rhs.width || lhs.height != rhs.height {
return false
}
// Check if the pixel buffers have the same pixel format.
if lhs.pixelFormatType != rhs.pixelFormatType {
return false
}
// Check if the pixel buffers have the same content.
var isEqual = true
CVPixelBufferLockBaseAddress(lhs, CVPixelBufferLockFlags(0))
CVPixelBufferLockBaseAddress(rhs, CVPixelBufferLockFlags(0))
defer {
CVPixelBufferUnlockBaseAddress(lhs, CVPixelBufferLockFlags(0))
CVPixelBufferUnlockBaseAddress(rhs, CVPixelBufferLockFlags(0))
}
let lhsData = lhs.baseAddress!.assumingMemoryBound(to: UInt8.self)
let rhsData = rhs.baseAddress!.assumingMemoryBound(to: UInt8.self)
let count = lhs.bytesPerRow * lhs.height
for i in 0..<count {
if lhsData[i] != rhsData[i] {
isEqual = false
break
}
}
return isEqual
}```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 {
// Check if the pixel buffers have the same size.
if lhs.width != rhs.width || lhs.height != rhs.height {
return false
}
// Check if the pixel buffers have the same pixel format.
if lhs.pixelFormatType != rhs.pixelFormatType {
return false
}
// Check if the pixel buffers have the same content.
var isEqual = true
CVPixelBufferLockBaseAddress(lhs, CVPixelBufferLockFlags(0))
CVPixelBufferLockBaseAddress(rhs, CVPixelBufferLockFlags(0))
defer {
CVPixelBufferUnlockBaseAddress(lhs, CVPixelBufferLockFlags(0))
CVPixelBufferUnlockBaseAddress(rhs, CVPixelBufferLockFlags(0))
}
let lhsData = lhs.baseAddress!.assumingMemoryBound(to: UInt8.self)
let rhsData = rhs.baseAddress!.assumingMemoryBound(to: UInt8.self)
let count = lhs.bytesPerRow * lhs.height
for i in 0..<count {
if lhsData[i] != rhsData[i] {
isEqual = false
break
}
}
return isEqual
}
```if lhs.width != rhs.width || lhs.height != rhs.height { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width != rhs.width || lhs.height != rhs.height { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width != rhs.width || lhs.height != rhs.height { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width != rhs.width || lhs.height != rhs.height { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.pixelFormatType != rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'if lhs.pixelFormatType != rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'CVPixelBufferLockBaseAddress(lhs, CVPixelBufferLockFlags(0)) // missing argument label 'rawValue:' in callCVPixelBufferLockBaseAddress(rhs, CVPixelBufferLockFlags(0)) // missing argument label 'rawValue:' in callCVPixelBufferUnlockBaseAddress(lhs, CVPixelBufferLockFlags(0)) // missing argument label 'rawValue:' in callCVPixelBufferUnlockBaseAddress(rhs, CVPixelBufferLockFlags(0)) // missing argument label 'rawValue:' in calllet lhsData = lhs.baseAddress!.assumingMemoryBound(to: UInt8.self) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'baseAddress'let rhsData = rhs.baseAddress!.assumingMemoryBound(to: UInt8.self) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'baseAddress'let count = lhs.bytesPerRow * lhs.height // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'let count = lhs.bytesPerRow * lhs.height // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
// Check if two pixel buffers are equal in size, pixel format, and content.
return lhs.isEqual(to: 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 {
// Check if two pixel buffers are equal in size, pixel format, and content.
return lhs.isEqual(to: rhs)
}
```return lhs.isEqual(to: rhs) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'isEqual'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
// Check if the two buffers are the same object.
if lhs === rhs {
return true
}
// Check if the two buffers have the same size.
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
if lhsWidth != rhsWidth || lhsHeight != rhsHeight {
return false
}
// Check if the two buffers have the same pixel format.
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
if lhsPixelFormat != rhsPixelFormat {
return false
}
// Check if the two buffers have the same content.
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
for y in 0..<lhsHeight {
let lhsRow = UnsafeRawPointer(lhsData).advanced(by: y * lhsBytesPerRow)
let rhsRow = UnsafeRawPointer(rhsData).advanced(by: y * rhsBytesPerRow)
if memcmp(lhsRow, rhsRow, lhsBytesPerRow) != 0 {
return false
}
}
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 {
// Check if the two buffers are the same object.
if lhs === rhs {
return true
}
// Check if the two buffers have the same size.
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
if lhsWidth != rhsWidth || lhsHeight != rhsHeight {
return false
}
// Check if the two buffers have the same pixel format.
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
if lhsPixelFormat != rhsPixelFormat {
return false
}
// Check if the two buffers have the same content.
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
for y in 0..<lhsHeight {
let lhsRow = UnsafeRawPointer(lhsData).advanced(by: y * lhsBytesPerRow)
let rhsRow = UnsafeRawPointer(rhsData).advanced(by: y * rhsBytesPerRow)
if memcmp(lhsRow, rhsRow, lhsBytesPerRow) != 0 {
return false
}
}
return true
}
```let lhsRow = UnsafeRawPointer(lhsData).advanced(by: y * lhsBytesPerRow) // value of optional type 'UnsafeMutableRawPointer?' must be unwrapped to a value of type 'UnsafeMutableRawPointer'let lhsRow = UnsafeRawPointer(lhsData).advanced(by: y * lhsBytesPerRow) // value of optional type 'UnsafeRawPointer?' must be unwrapped to refer to member 'advanced' of wrapped base type 'UnsafeRawPointer'let rhsRow = UnsafeRawPointer(rhsData).advanced(by: y * rhsBytesPerRow) // value of optional type 'UnsafeMutableRawPointer?' must be unwrapped to a value of type 'UnsafeMutableRawPointer'let rhsRow = UnsafeRawPointer(rhsData).advanced(by: y * rhsBytesPerRow) // value of optional type 'UnsafeRawPointer?' must be unwrapped to refer to member 'advanced' of wrapped base type 'UnsafeRawPointer'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
// Check if the two pixel buffers are the same object.
if lhs === rhs {
return true
}
// Check if the two pixel buffers have the same size, pixel format, and content.
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
// Create a temporary buffer to hold the pixel data.
var tempBuffer = UnsafeMutableRawPointer.allocate(byteCount: lhs.width * lhs.height * 4)
// Lock the pixel buffers.
lhs.lockBaseAddress()
rhs.lockBaseAddress()
// Copy the pixel data from the first pixel buffer to the temporary buffer.
lhs.getBytes(tempBuffer, bytesPerRow: lhs.bytesPerRow, planeIndex: 0)
// Check if the pixel data in the temporary buffer matches the pixel data in the second pixel buffer.
let result = tempBuffer.compare(rhs.baseAddress!, byteCount: lhs.width * lhs.height * 4) == 0
// Unlock the pixel buffers.
lhs.unlockBaseAddress()
rhs.unlockBaseAddress()
// Free the temporary buffer.
tempBuffer.deallocate()
return result
}
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 {
// Check if the two pixel buffers are the same object.
if lhs === rhs {
return true
}
// Check if the two pixel buffers have the same size, pixel format, and content.
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
// Create a temporary buffer to hold the pixel data.
var tempBuffer = UnsafeMutableRawPointer.allocate(byteCount: lhs.width * lhs.height * 4)
// Lock the pixel buffers.
lhs.lockBaseAddress()
rhs.lockBaseAddress()
// Copy the pixel data from the first pixel buffer to the temporary buffer.
lhs.getBytes(tempBuffer, bytesPerRow: lhs.bytesPerRow, planeIndex: 0)
// Check if the pixel data in the temporary buffer matches the pixel data in the second pixel buffer.
let result = tempBuffer.compare(rhs.baseAddress!, byteCount: lhs.width * lhs.height * 4) == 0
// Unlock the pixel buffers.
lhs.unlockBaseAddress()
rhs.unlockBaseAddress()
// Free the temporary buffer.
tempBuffer.deallocate()
return result
}
return false
}
```if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'var tempBuffer = UnsafeMutableRawPointer.allocate(byteCount: lhs.width * lhs.height * 4) // missing argument for parameter 'alignment' in callvar tempBuffer = UnsafeMutableRawPointer.allocate(byteCount: lhs.width * lhs.height * 4) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'var tempBuffer = UnsafeMutableRawPointer.allocate(byteCount: lhs.width * lhs.height * 4) // cannot convert value of type 'Duration' to expected argument type 'Int'var tempBuffer = UnsafeMutableRawPointer.allocate(byteCount: lhs.width * lhs.height * 4) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'lhs.lockBaseAddress() // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'lockBaseAddress'rhs.lockBaseAddress() // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'lockBaseAddress'lhs.getBytes(tempBuffer, bytesPerRow: lhs.bytesPerRow, planeIndex: 0) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'lhs.getBytes(tempBuffer, bytesPerRow: lhs.bytesPerRow, planeIndex: 0) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'getBytes'let result = tempBuffer.compare(rhs.baseAddress!, byteCount: lhs.width * lhs.height * 4) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'let result = tempBuffer.compare(rhs.baseAddress!, byteCount: lhs.width * lhs.height * 4) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'let result = tempBuffer.compare(rhs.baseAddress!, byteCount: lhs.width * lhs.height * 4) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'baseAddress'lhs.unlockBaseAddress() // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'unlockBaseAddress'rhs.unlockBaseAddress() // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'unlockBaseAddress'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
// Get the raw bytes of the private structs.
let bytes = UnsafeRawBufferPointer(items)
// Reinterpret the bytes as an array of public structs.
let publicItems = UnsafeRawBufferPointer<PublicItem>(bytes)
// Return the array of public structs.
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] {
// Get the raw bytes of the private structs.
let bytes = UnsafeRawBufferPointer(items)
// Reinterpret the bytes as an array of public structs.
let publicItems = UnsafeRawBufferPointer<PublicItem>(bytes)
// Return the array of public structs.
return publicItems
}
// Create an array of private structs.
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
// Convert the array of private structs into an array of public structs.
let publicItems = reveal(items: privateItems)
// Print the values of the public structs.
for item in publicItems {
print(item.value)
}
// Prints:
// 1
// 2
// 3
```let bytes = UnsafeRawBufferPointer(items) // no exact matches in call to initializerlet publicItems = UnsafeRawBufferPointer<PublicItem>(bytes) // cannot specialize non-generic type 'UnsafeRawBufferPointer'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let privateBytes = UnsafeRawBufferPointer(items).assumingMemoryBound(to: PrivateItem.self).map { $0.value }
let publicBytes = UnsafeRawBufferPointer(privateBytes).assumingMemoryBound(to: PublicItem.self)
return Array(publicBytes)
}```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 privateBytes = UnsafeRawBufferPointer(items).assumingMemoryBound(to: PrivateItem.self).map { $0.value }
let publicBytes = UnsafeRawBufferPointer(privateBytes).assumingMemoryBound(to: PublicItem.self)
return Array(publicBytes)
}
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 privateBytes = UnsafeRawBufferPointer(items).assumingMemoryBound(to: PrivateItem.self).map { $0.value } // 'value' is inaccessible due to 'private' protection levellet privateBytes = UnsafeRawBufferPointer(items).assumingMemoryBound(to: PrivateItem.self).map { $0.value } // no exact matches in call to initializerstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let privateMemory = UnsafeRawPointer(Unmanaged.passUnretained(items).toOpaque())
let publicMemory = privateMemory.assumingMemoryLayout(of: [PublicItem].self)
return withUnsafeBytes(of: publicMemory) { $0.map { PublicItem(value: $0.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 privateMemory = UnsafeRawPointer(Unmanaged.passUnretained(items).toOpaque())
let publicMemory = privateMemory.assumingMemoryLayout(of: [PublicItem].self)
return withUnsafeBytes(of: publicMemory) { $0.map { PublicItem(value: $0.value) } }
}
// 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 privateMemory = UnsafeRawPointer(Unmanaged.passUnretained(items).toOpaque()) // generic struct 'Unmanaged' requires that '[PrivateItem]' be a class typelet privateMemory = UnsafeRawPointer(Unmanaged.passUnretained(items).toOpaque()) // generic struct 'Unmanaged' requires that '[PrivateItem]' be a class typelet privateMemory = UnsafeRawPointer(Unmanaged.passUnretained(items).toOpaque()) // generic struct 'Unmanaged' requires that '[PrivateItem]' be a class typereturn withUnsafeBytes(of: publicMemory) { $0.map { PublicItem(value: $0.value) } } // value of type 'UnsafeRawBufferPointer.Element' (aka 'UInt8') has no member 'value'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let privateBytes = UnsafeRawBufferPointer(items).withUnsafeBytes { UnsafeRawBufferPointer($0) }
let publicBytes = privateBytes.map { UnsafeRawBufferPointer(UnsafeRawBufferPointer($0).map { UnsafeRawBufferPointer($0) }) }
return publicBytes.map { PublicItem(value: $0.first!) }
}```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 privateBytes = UnsafeRawBufferPointer(items).withUnsafeBytes { UnsafeRawBufferPointer($0) }
let publicBytes = privateBytes.map { UnsafeRawBufferPointer(UnsafeRawBufferPointer($0).map { UnsafeRawBufferPointer($0) }) }
return publicBytes.map { PublicItem(value: $0.first!) }
}
// 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 privateBytes = UnsafeRawBufferPointer(items).withUnsafeBytes { UnsafeRawBufferPointer($0) } // no exact matches in call to initializerlet publicBytes = privateBytes.map { UnsafeRawBufferPointer(UnsafeRawBufferPointer($0).map { UnsafeRawBufferPointer($0) }) } // no exact matches in call to initializerlet publicBytes = privateBytes.map { UnsafeRawBufferPointer(UnsafeRawBufferPointer($0).map { UnsafeRawBufferPointer($0) }) } // no exact matches in call to initializerstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let privateMemory = UnsafeRawPointer(Unmanaged.passUnretained(items).toOpaque())
let publicMemory = privateMemory.assumingMemoryBound(to: [PublicItem].self)
return publicMemory.load()
}```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 privateMemory = UnsafeRawPointer(Unmanaged.passUnretained(items).toOpaque())
let publicMemory = privateMemory.assumingMemoryBound(to: [PublicItem].self)
return publicMemory.load()
}
// 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 privateMemory = UnsafeRawPointer(Unmanaged.passUnretained(items).toOpaque()) // generic struct 'Unmanaged' requires that '[PrivateItem]' be a class typelet privateMemory = UnsafeRawPointer(Unmanaged.passUnretained(items).toOpaque()) // generic struct 'Unmanaged' requires that '[PrivateItem]' be a class typelet privateMemory = UnsafeRawPointer(Unmanaged.passUnretained(items).toOpaque()) // generic struct 'Unmanaged' requires that '[PrivateItem]' be a class typestruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let privateBytes = UnsafeRawBufferPointer(items).map { $0.value }
let publicBytes = UnsafeRawBufferPointer(privateBytes).map { PublicItem(value: $0) }
return Array(publicBytes)
}```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 privateBytes = UnsafeRawBufferPointer(items).map { $0.value }
let publicBytes = UnsafeRawBufferPointer(privateBytes).map { PublicItem(value: $0) }
return Array(publicBytes)
}
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 privateBytes = UnsafeRawBufferPointer(items).map { $0.value } // value of type 'UnsafeRawBufferPointer.Element' (aka 'UInt8') has no member 'value'let privateBytes = UnsafeRawBufferPointer(items).map { $0.value } // no exact matches in call to initializerlet publicBytes = UnsafeRawBufferPointer(privateBytes).map { PublicItem(value: $0) } // cannot convert value of type 'UnsafeRawBufferPointer.Element' (aka 'UInt8') to expected argument type 'Int'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let privateBytes = UnsafeRawBufferPointer(items).assumingMemoryBound(to: PrivateItem.self)
let publicBytes = UnsafeRawBufferPointer(privateBytes).assumingMemoryBound(to: PublicItem.self)
return Array(publicBytes)
}```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 privateBytes = UnsafeRawBufferPointer(items).assumingMemoryBound(to: PrivateItem.self)
let publicBytes = UnsafeRawBufferPointer(privateBytes).assumingMemoryBound(to: PublicItem.self)
return Array(publicBytes)
}
// 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 privateBytes = UnsafeRawBufferPointer(items).assumingMemoryBound(to: PrivateItem.self) // no exact matches in call to initializerstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let privateMemory = UnsafeRawBufferPointer(items)
let publicMemory = privateMemory.map { UnsafeRawBufferPointer($0).map { PublicItem(value: $0) } }
return Array(publicMemory)
}```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 privateMemory = UnsafeRawBufferPointer(items)
let publicMemory = privateMemory.map { UnsafeRawBufferPointer($0).map { PublicItem(value: $0) } }
return Array(publicMemory)
}
// 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 privateMemory = UnsafeRawBufferPointer(items) // no exact matches in call to initializerlet publicMemory = privateMemory.map { UnsafeRawBufferPointer($0).map { PublicItem(value: $0) } } // cannot convert value of type 'UnsafeRawBufferPointer.Element' (aka 'UInt8') to expected argument type 'Int'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let privateBytes = UnsafeRawBufferPointer(items)
let publicBytes = privateBytes.map { UnsafeRawBufferPointer($0).map { PublicItem(value: $0) } }
return Array(publicBytes)
}```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 privateBytes = UnsafeRawBufferPointer(items)
let publicBytes = privateBytes.map { UnsafeRawBufferPointer($0).map { PublicItem(value: $0) } }
return Array(publicBytes)
}
// 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 privateBytes = UnsafeRawBufferPointer(items) // no exact matches in call to initializerlet publicBytes = privateBytes.map { UnsafeRawBufferPointer($0).map { PublicItem(value: $0) } } // cannot convert value of type 'UnsafeRawBufferPointer.Element' (aka 'UInt8') to expected argument type 'Int'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let privateBytes = UnsafeRawBufferPointer(items)
let publicBytes = privateBytes.map { UnsafeRawBufferPointer(reinterpreting: $0) }
return publicBytes.map { PublicItem(value: $0.first!) }
}```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 privateBytes = UnsafeRawBufferPointer(items)
let publicBytes = privateBytes.map { UnsafeRawBufferPointer(reinterpreting: $0) }
return publicBytes.map { PublicItem(value: $0.first!) }
}
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 privateBytes = UnsafeRawBufferPointer(items) // no exact matches in call to initializerlet publicBytes = privateBytes.map { UnsafeRawBufferPointer(reinterpreting: $0) } // no exact matches in call to initializerenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// ...
}```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 {
// ...
}
```} // missing return in global function expected to return 'ComparisonResult'enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function
}```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
}
```} // missing return in global function expected to return 'ComparisonResult'enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// ...
}```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 {
// ...
}
// Example of usage:
compareVersions("1.0.0", "1.0.1") // returns orderedAscending
compareVersions("1.0.1", "1.0.0") // returns orderedDescending
compareVersions("1.0.0", "1.0.0") // returns orderedSame
compareVersions("1.0.0", "1.0.0-alpha") // returns orderedDescending
compareVersions("1.0.0", "1.0.0-beta") // returns orderedDescending
compareVersions("1.0.0-alpha", "1.0.0-beta") // returns orderedAscending
compareVersions("1.0.0-alpha", "1.0.0-alpha.1") // returns orderedAscending
compareVersions("1.0.0-alpha.1", "1.0.0-alpha.beta") // returns orderedAscending
compareVersions("1.0.0-alpha.beta", "1.0.0-beta") // returns orderedAscending
compareVersions("1.0.0-beta", "1.0.0-beta.2") // returns orderedAscending
compareVersions("1.0.0-beta.2", "1.0.0-beta.11") // returns orderedAscending
compareVersions("1.0.0-beta.11", "1.0.0-rc.1") // returns orderedAscending
compareVersions("1.0.0-rc.1", "1.0.0") // returns orderedAscending
```} // missing return in global function expected to return 'ComparisonResult'enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// ...
}
func highestVersion(_ versions: [String]) -> String {
// ...
}```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 {
// ...
}
// Function that returns the version number string with the highest value from an array of version number strings.
func highestVersion(_ versions: [String]) -> String {
// ...
}
```} // missing return in global function expected to return 'ComparisonResult'} // missing return in global function expected to return 'String'enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for (index, lhsComponent) in lhsComponents.enumerated() {
let rhsComponent = rhsComponents[index]
if lhsComponent != rhsComponent {
let lhsVersion = Int(lhsComponent) ?? 0
let rhsVersion = Int(rhsComponent) ?? 0
if lhsVersion > rhsVersion {
return .orderedDescending
} else if lhsVersion < rhsVersion {
return .orderedAscending
}
}
}
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 lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for (index, lhsComponent) in lhsComponents.enumerated() {
let rhsComponent = rhsComponents[index]
if lhsComponent != rhsComponent {
let lhsVersion = Int(lhsComponent) ?? 0
let rhsVersion = Int(rhsComponent) ?? 0
if lhsVersion > rhsVersion {
return .orderedDescending
} else if lhsVersion < rhsVersion {
return .orderedAscending
}
}
}
return .orderedSame
}
// Example usage
let version1 = "1.0.0"
let version2 = "1.0.1"
let result = compareVersions(version1, version2)
print(result) // Output: .orderedAscending
``` // XCTAssertTrue failedenum 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 {
let lhsParts = lhs.split(separator: ".")
let rhsParts = rhs.split(separator: ".")
for (lhsPart, rhsPart) in zip(lhsParts, rhsParts) {
let lhsNumber = Int(String(lhsPart)) ?? 0
let rhsNumber = Int(String(rhsPart)) ?? 0
if lhsNumber < rhsNumber {
return .orderedAscending
} else if lhsNumber > rhsNumber {
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: ".")
for (lhsPart, rhsPart) in zip(lhsParts, rhsParts) {
let lhsNumber = Int(String(lhsPart)) ?? 0
let rhsNumber = Int(String(rhsPart)) ?? 0
if lhsNumber < rhsNumber {
return .orderedAscending
} else if lhsNumber > rhsNumber {
return .orderedDescending
}
}
return .orderedSame
}
// Test cases
print(compareVersions("1.0.0", "1.0.0")) // orderedSame
print(compareVersions("1.0.0", "1.0.1")) // orderedAscending
print(compareVersions("1.0.1", "1.0.0")) // orderedDescending
print(compareVersions("1.0.0", "1.1.0")) // orderedAscending
print(compareVersions("1.1.0", "1.0.0")) // orderedDescending
print(compareVersions("1.0.0", "2.0.0")) // orderedAscending
print(compareVersions("2.0.0", "1.0.0")) // orderedDescending
print(compareVersions("1.0.0", "1.0.0-alpha")) // orderedDescending
print(compareVersions("1.0.0-alpha", "1.0.0")) // orderedAscending
print(compareVersions("1.0.0-alpha", "1.0.0-beta")) // orderedAscending
print(compareVersions("1.0.0-beta", "1.0.0-alpha")) // orderedDescending
print(compareVersions("1.0.0-alpha", "1.0.0-alpha.1")) // orderedAscending
print(compareVersions("1.0.0-alpha.1", "1.0.0-alpha")) // orderedDescending
print(compareVersions("1.0.0-alpha.1", "1.0.0-alpha.2")) // orderedAscending
print(compareVersions("1.0.0-alpha.2", "1.0.0-alpha.1")) // orderedDescending
print(compareVersions("1.0.0-alpha.1", "1.0.0-beta")) // orderedAscending
print(compareVersions("1.0.0-beta", "1.0.0-alpha.1")) // orderedDescending
print(compareVersions("1.0.0-alpha.1", "1.0.0-beta.1")) // orderedAscending
print(compareVersions("1.0.0-beta.1", "1.0.0-alpha.1")) // orderedDescending
print(compareVersions("1.0.0-alpha.1", "1.0.0-beta.2")) // orderedAscending
print(compareVersions("1.0.0-beta.2", "1.0.0-alpha.1")) // orderedDescending
print(compareVersions("1.0.0-alpha.1", "1.0.0-beta.1.1")) // orderedAscending
print(compareVersions("1.0.0-beta.1.1", "1.0.0-alpha.1")) // orderedDescending
print(compareVersions("1.0.0-alpha.1", "1.0.0-beta.1.2")) // orderedAscending
print(compareVersions("1.0.0-beta.1.2", "1.0.0-alpha.1")) // orderedDescending
print(compareVersions("1.0.0-alpha.1", // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".")
let rhsComponents = rhs.split(separator: ".")
let minLength = min(lhsComponents.count, rhsComponents.count)
for i in 0..<minLength {
let lhsComponent = lhsComponents[i]
let rhsComponent = rhsComponents[i]
if let lhsNumber = Int(lhsComponent), let rhsNumber = Int(rhsComponent) {
if lhsNumber < rhsNumber {
return .orderedAscending
} else if lhsNumber > rhsNumber {
return .orderedDescending
}
} else {
if lhsComponent < rhsComponent {
return .orderedAscending
} else if lhsComponent > rhsComponent {
return .orderedDescending
}
}
}
if lhsComponents.count < rhsComponents.count {
return .orderedAscending
} else if lhsComponents.count > rhsComponents.count {
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 lhsComponents = lhs.split(separator: ".")
let rhsComponents = rhs.split(separator: ".")
let minLength = min(lhsComponents.count, rhsComponents.count)
for i in 0..<minLength {
let lhsComponent = lhsComponents[i]
let rhsComponent = rhsComponents[i]
if let lhsNumber = Int(lhsComponent), let rhsNumber = Int(rhsComponent) {
if lhsNumber < rhsNumber {
return .orderedAscending
} else if lhsNumber > rhsNumber {
return .orderedDescending
}
} else {
if lhsComponent < rhsComponent {
return .orderedAscending
} else if lhsComponent > rhsComponent {
return .orderedDescending
}
}
}
if lhsComponents.count < rhsComponents.count {
return .orderedAscending
} else if lhsComponents.count > rhsComponents.count {
return .orderedDescending
}
return .orderedSame
}
// Example usage
let result = compareVersions("1.0.0", "1.0.1")
print(result) // Output: orderedAscending
result = compareVersions("1.0.1", "1.0.0")
print(result) // Output: orderedDescending
result = compareVersions("1.0.0", "1.0.0")
print(result) // Output: orderedSame
result = compareVersions("1.0.0", "1.0.0.1")
print(result) // Output: orderedAscending
result = compareVersions("1.0.0.1", "1.0.0")
print(result) // Output: orderedDescending
result = compareVersions("1.0.0", "1.0.0-alpha")
print(result) // Output: orderedDescending
result = compareVersions("1.0.0-alpha", "1.0.0")
print(result) // Output: orderedAscending
result = compareVersions("1.0.0-alpha", "1.0.0-beta")
print(result) // Output: orderedAscending
result = compareVersions("1.0.0-beta", "1.0.0-alpha")
print(result) // Output: orderedDescending
result = compareVersions("1.0.0-alpha", "1.0.0-alpha")
print(result) // Output: orderedSame
result = compareVersions("1.0.0-alpha", "1.0.0-alpha.1")
print(result) // Output: orderedAscending
result = compareVersions("1.0.0-alpha.1", "1.0.0-alpha")
print(result) // Output: orderedDescending
result = compareVersions("1.0.0-alpha.1", "1.0.0-alpha.2")
print(result) // Output: orderedAscending
result = compareVersions("1.0.0-alpha.2", "1.0.0-alpha.1")
print(result) // Output: orderedDescending
result = compareVersions("1.0.0-alpha.1", "1.0.0-alpha.1")
print(result) // Output: orderedSame
result = compareVersions("1.0.0-alpha.1", "1.0.0-alpha.2")
print(result) // Output: orderedAscending
result = compareVersions("1.0.0-alpha.2", "1.0.0-alpha.1")
print(result) // Output: orderedDescending
result = compareVersions("1.0.0-alpha.1", "1.0.0-alpha.1")
print(result) // Output: orderedSame // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".")
let rhsComponents = rhs.split(separator: ".")
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
let lhsVersion = Int(String(lhsComponent.prefix(while: { $0.isNumber }))) ?? 0
let rhsVersion = Int(String(rhsComponent.prefix(while: { $0.isNumber }))) ?? 0
if lhsVersion > rhsVersion {
return .orderedDescending
} else if lhsVersion < rhsVersion {
return .orderedAscending
}
}
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 lhsComponents = lhs.split(separator: ".")
let rhsComponents = rhs.split(separator: ".")
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
let lhsVersion = Int(String(lhsComponent.prefix(while: { $0.isNumber }))) ?? 0
let rhsVersion = Int(String(rhsComponent.prefix(while: { $0.isNumber }))) ?? 0
if lhsVersion > rhsVersion {
return .orderedDescending
} else if lhsVersion < rhsVersion {
return .orderedAscending
}
}
return .orderedSame
}
// Example usage
let version1 = "1.0.0"
let version2 = "1.0.1"
let version3 = "1.1.0"
let version4 = "1.0.0-alpha"
let version5 = "1.0.0-beta"
print(compareVersions(version1, version2)) // Output: .orderedAscending
print(compareVersions(version2, version3)) // Output: .orderedAscending
print(compareVersions(version4, version5)) // Output: .orderedDescending
``` // XCTAssertTrue failedenum 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 failed