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 {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw error
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns default error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw error
}
}
```func parse(string: String) throws -> JSON { // invalid redeclaration of 'parse(string:)'typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
}
func parse(string: String) -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
return try JSONSerialization.jsonObject(with: data, options: []) as! 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 {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
}
// JSON parser, rethrows standard error type in case of failures.
func parse(string: String) -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
}
```func parse(string: String) -> JSON { // invalid redeclaration of 'parse(string:)'throw ParsingError.invalidInput // error is not handled because the enclosing function is not declared 'throws'return try JSONSerialization.jsonObject(with: data, options: []) as! JSON // errors thrown from here are not handledtypealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// Usage
let json = try parse(string: "{\"foo\": \"bar\"}")
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
let json: Any
do {
json = try JSONSerialization.jsonObject(with: data)
} catch {
throw ParsingError.internalError(error)
}
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 {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
let json: Any
do {
json = try JSONSerialization.jsonObject(with: data)
} catch {
throw ParsingError.internalError(error)
}
guard let result = json as? JSON else {
throw ParsingError.invalidInput
}
return result
}
// Usage
do {
let json = try parse(string: "{\"foo\": 123}")
print(json)
} catch {
print(error)
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
guard let json = try JSONSerialization.jsonObject(with: data) as? JSON else {
throw ParsingError.invalidInput
}
return 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 {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
guard let json = try JSONSerialization.jsonObject(with: data) as? JSON else {
throw ParsingError.invalidInput
}
return json
}
// JSON parser, throws standard error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
guard let json = try JSONSerialization.jsonObject(with: data) as? JSON else {
throw ParsingError.invalidInput
}
return json
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
guard let json = try JSONSerialization.jsonObject(with: data) as? JSON else {
throw ParsingError.invalidInput
}
return json
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
guard let json = try JSONSerialization.jsonObject(with: data) as? JSON else {
throw ParsingError.invalidInput
}
return json
}
``` // XCTAssertTrue failedtypealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// Usage
let json = try parse(string: "{\"key\": \"value\"}")
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
guard let json = try JSONSerialization.jsonObject(with: data) as? JSON else {
throw ParsingError.invalidInput
}
return 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 {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
guard let json = try JSONSerialization.jsonObject(with: data) as? JSON else {
throw ParsingError.invalidInput
}
return json
}
// JSON parser, returns Error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
guard let json = try JSONSerialization.jsonObject(with: data) as? JSON else {
throw ParsingError.invalidInput
}
return json
}
// JSON parser, returns Error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
guard let json = try JSONSerialization.jsonObject(with: data) as? JSON else {
throw ParsingError.invalidInput
}
return json
}
// JSON parser, returns Error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
guard let json = try JSONSerialization.jsonObject(with: data) as? JSON else {
throw ParsingError.invalidInput
}
return json
}
``` // XCTAssertTrue failedtypealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
return try JSONSerialization.jsonObject(with: data, options: []) as! 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 {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
}
// JSON parser, returns standard error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
}
// JSON parser, returns standard error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
}
``` // XCTAssertTrue failedtypealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// Usage
let json = try parse(string: "{\"a\": 1}")
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// Usage
let json = try parse(string: "{\"a\": 1}")
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributes = attributes.map { " \($0.0)=\"\($0.1)\"" }
let children = children.map { generate($0) }
return "<\(name)\(attributes.joined())>\(children.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 let .text(content):
return content
case let .element(name, attributes, children):
let attributes = attributes.map { " \($0.0)=\"\($0.1)\"" }
let children = children.map { generate($0) }
return "<\(name)\(attributes.joined())>\(children.joined())</\(name)>"
}
}
// Generate HTML from predefined elements tree.
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"]),
.text("Hello, World!")
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.key)=\"\($0.value)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.key)=\"\($0.value)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// Generate HTML from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.key)=\"\($0.value)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// Generate HTML from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.key)=\"\($0.value)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// Generate HTML from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.key)=\"\($0.value)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// Generate HTML from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.key)=\"\($0.value)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// Generate HTML from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.key)=\"\($0.value)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// Generate HTML from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.key)=\"\($0.value)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributes = attributes.map { " \($0.0)=\"\($0.1)\"" }
let children = children.map { generate($0) }
return "<\(name)\(attributes.joined())>\(children.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 let .text(content):
return content
case let .element(name, attributes, children):
let attributes = attributes.map { " \($0.0)=\"\($0.1)\"" }
let children = children.map { generate($0) }
return "<\(name)\(attributes.joined())>\(children.joined())</\(name)>"
}
}
// Generate HTML from predefined elements tree.
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"]),
.text("Hello, World!")
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributes = attributes.map { " \($0.0)=\"\($0.1)\"" }
let children = children.map { generate($0) }
return "<\(name)\(attributes.joined())>\(children.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 let .text(content):
return content
case let .element(name, attributes, children):
let attributes = attributes.map { " \($0.0)=\"\($0.1)\"" }
let children = children.map { generate($0) }
return "<\(name)\(attributes.joined())>\(children.joined())</\(name)>"
}
}
// Generate HTML from predefined elements tree.
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"]),
.text("Hello, World!")
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.0)=\"\($0.1)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.0)=\"\($0.1)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// Generate HTML from predefined elements tree.
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"]),
.text("Hello, world!")
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.0)=\"\($0.1)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.0)=\"\($0.1)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.0)=\"\($0.1)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.0)=\"\($0.1)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.0)=\"\($0.1)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.0)=\"\($0.1)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.0)=\"\($0.1)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.0)=\"\($0.1)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.key)=\"\($0.value)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " \($0.key)=\"\($0.value)\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
// Generate HTML from predefined elements tree.
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"]),
.text("Hello, World!")
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributes = attributes.map { " \($0.0)=\"\($0.1)\"" }
let children = children.map { generate($0) }
return "<\(name)\(attributes.joined())>\(children.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 let .text(content):
return content
case let .element(name, attributes, children):
let attributes = attributes.map { " \($0.0)=\"\($0.1)\"" }
let children = children.map { generate($0) }
return "<\(name)\(attributes.joined())>\(children.joined())</\(name)>"
}
}
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"]),
.text("Hello, world!")
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " " + $0.key + "=\"" + $0.value + "\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
let attributesString = attributes.map { " " + $0.key + "=\"" + $0.value + "\"" }.joined()
let childrenString = children.map { generate($0) }.joined()
return "<\(name)\(attributesString)>\(childrenString)</\(name)>"
}
}
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"]),
.text("Hello, World!")
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
let stack = try tokens.reduce(Stack()) { stack, token in
switch token {
case "+":
return try stack.push(stack.pop()! + stack.pop()!)
case "-":
return try stack.push(stack.pop()! - stack.pop()!)
case "*":
return try stack.push(stack.pop()! * stack.pop()!)
case "/":
return try stack.push(stack.pop()! / stack.pop()!)
case "(":
return stack
case ")":
return try stack.pop()!
default:
return try stack.push(Double(token)!)
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.pop()!
}
struct Stack {
private var array: [Double] = []
mutating func push(_ value: Double) throws -> Stack {
array.append(value)
return self
}
mutating func pop() throws -> Double {
guard !array.isEmpty else {
throw CalculateError.invalidInput
}
return array.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: " ")
let stack = try tokens.reduce(Stack()) { stack, token in
switch token {
case "+":
return try stack.push(stack.pop()! + stack.pop()!)
case "-":
return try stack.push(stack.pop()! - stack.pop()!)
case "*":
return try stack.push(stack.pop()! * stack.pop()!)
case "/":
return try stack.push(stack.pop()! / stack.pop()!)
case "(":
return stack
case ")":
return try stack.pop()!
default:
return try stack.push(Double(token)!)
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.pop()!
}
// Stack implementation using array.
struct Stack {
private var array: [Double] = []
mutating func push(_ value: Double) throws -> Stack {
array.append(value)
return self
}
mutating func pop() throws -> Double {
guard !array.isEmpty else {
throw CalculateError.invalidInput
}
return array.removeLast()
}
}
```return try stack.push(stack.pop()! + stack.pop()!) // cannot use mutating member on immutable value: 'stack' is a 'let' constantreturn try stack.push(stack.pop()! + stack.pop()!) // cannot use mutating member on immutable value: 'stack' is a 'let' constantreturn try stack.push(stack.pop()! + stack.pop()!) // cannot use mutating member on immutable value: 'stack' is a 'let' constantreturn try stack.push(stack.pop()! + stack.pop()!) // cannot force unwrap value of non-optional type 'Double'return try stack.push(stack.pop()! + stack.pop()!) // cannot force unwrap value of non-optional type 'Double'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = try tokenize(string)
return try parse(tokens)
}
func tokenize(_ string: String) throws -> [Token] {
var tokens: [Token] = []
var buffer: String = ""
var lastToken: Token?
var lastOperator: Operator?
func flush() {
if !buffer.isEmpty {
tokens.append(Token(buffer, lastToken, lastOperator))
buffer = ""
}
}
for character in string {
switch character {
case " ":
flush()
case "+", "-", "*", "/":
flush()
lastOperator = Operator(character)
case "(":
flush()
lastToken = Token("(", nil, nil)
case ")":
flush()
lastToken = Token(")", nil, nil)
default:
buffer.append(character)
}
}
flush()
return tokens
}
func parse(_ tokens: [Token]) throws -> Double {
var stack: [Double] = []
var lastToken: Token?
var lastOperator: Operator?
for token in tokens {
switch token.type {
case .number:
stack.append(token.value)
case .openingParenthesis:
lastToken = token
case .closingParenthesis:
guard let lastToken = lastToken, lastToken.type == .openingParenthesis else {
throw CalculateError.invalidInput
}
let value = stack.popLast()!
stack.append(value)
case .operator:
guard let lastToken = lastToken, let lastOperator = lastOperator else {
throw CalculateError.invalidInput
}
let value = stack.popLast()!
stack.append(lastOperator.apply(value, lastToken.value))
lastToken = token
}
}
guard let lastToken = lastToken, let lastOperator = lastOperator else {
throw CalculateError.invalidInput
}
let value = stack.popLast()!
return lastOperator.apply(value, lastToken.value)
}```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 = try tokenize(string)
return try parse(tokens)
}
// Tokenize string into tokens.
func tokenize(_ string: String) throws -> [Token] {
var tokens: [Token] = []
var buffer: String = ""
var lastToken: Token?
var lastOperator: Operator?
func flush() {
if !buffer.isEmpty {
tokens.append(Token(buffer, lastToken, lastOperator))
buffer = ""
}
}
for character in string {
switch character {
case " ":
flush()
case "+", "-", "*", "/":
flush()
lastOperator = Operator(character)
case "(":
flush()
lastToken = Token("(", nil, nil)
case ")":
flush()
lastToken = Token(")", nil, nil)
default:
buffer.append(character)
}
}
flush()
return tokens
}
// Parse tokens into value.
func parse(_ tokens: [Token]) throws -> Double {
var stack: [Double] = []
var lastToken: Token?
var lastOperator: Operator?
for token in tokens {
switch token.type {
case .number:
stack.append(token.value)
case .openingParenthesis:
lastToken = token
case .closingParenthesis:
guard let lastToken = lastToken, lastToken.type == .openingParenthesis else {
throw CalculateError.invalidInput
}
let value = stack.popLast()!
stack.append(value)
case .operator:
guard let lastToken = lastToken, let lastOperator = lastOperator else {
throw CalculateError.invalidInput
}
let value = stack.popLast()!
stack.append(lastOperator.apply(value, lastToken.value))
lastToken = token
}
}
guard let lastToken = lastToken, let lastOperator = lastOperator else {
throw CalculateError.invalidInput
}
let value = stack.popLast()!
return lastOperator.apply(value, lastToken.value)
}
```func tokenize(_ string: String) throws -> [Token] { // cannot find type 'Token' in scopevar tokens: [Token] = [] // cannot find type 'Token' in scopevar lastToken: Token? // cannot find type 'Token' in scopevar lastOperator: Operator? // cannot find type 'Operator' in scopetokens.append(Token(buffer, lastToken, lastOperator)) // cannot find 'Token' in scopelastOperator = Operator(character) // cannot find 'Operator' in scopelastToken = Token("(", nil, nil) // 'nil' requires a contextual typelastToken = Token("(", nil, nil) // cannot find 'Token' in scopelastToken = Token("(", nil, nil) // 'nil' requires a contextual typelastToken = Token(")", nil, nil) // 'nil' requires a contextual typelastToken = Token(")", nil, nil) // cannot find 'Token' in scopelastToken = Token(")", nil, nil) // 'nil' requires a contextual typefunc parse(_ tokens: [Token]) throws -> Double { // cannot find type 'Token' in scopevar lastToken: Token? // cannot find type 'Token' in scopevar lastOperator: Operator? // cannot find type 'Operator' in scopeenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
var stack = [Double]()
var index = tokens.startIndex
while index != tokens.endIndex {
let token = tokens[index]
switch token {
case "+":
guard let value = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! + value)
case "-":
guard let value = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! - value)
case "*":
guard let value = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! * value)
case "/":
guard let value = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! / value)
case "(":
index += 1
let endIndex = tokens.index(index, offsetBy: tokens[index...].firstIndex(of: ")")!)
try calculate(String(tokens[index..<endIndex]))
index = endIndex
case ")":
throw CalculateError.invalidInput
default:
guard let value = Double(String(token)) else { throw CalculateError.invalidInput }
stack.append(value)
}
index += 1
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.popLast!
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
var stack = [Double]()
var index = tokens.startIndex
while index != tokens.endIndex {
let token = tokens[index]
switch token {
case "+":
guard let value = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! + value)
case "-":
guard let value = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! - value)
case "*":
guard let value = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! * value)
case "/":
guard let value = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! / value)
case "(":
index += 1
let endIndex = tokens.index(index, offsetBy: tokens[index...].firstIndex(of: ")")!)
try calculate(String(tokens[index..<endIndex]))
index = endIndex
case ")":
throw CalculateError.invalidInput
default:
guard let value = Double(String(token)) else { throw CalculateError.invalidInput }
stack.append(value)
}
index += 1
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.popLast!
}
do {
let result = try calculate("2+2*2")
print(result) // 6.0
} catch {
print(error)
}
```stack.append(stack.popLast! + value) // method 'popLast' was used as a property; add () to call itstack.append(stack.popLast! + value) // cannot reference 'mutating' method as function valuestack.append(stack.popLast! - value) // cannot reference 'mutating' method as function valuestack.append(stack.popLast! - value) // method 'popLast' was used as a property; add () to call itstack.append(stack.popLast! * value) // cannot reference 'mutating' method as function valuestack.append(stack.popLast! * value) // method 'popLast' was used as a property; add () to call itstack.append(stack.popLast! / value) // method 'popLast' was used as a property; add () to call itstack.append(stack.popLast! / value) // cannot reference 'mutating' method as function valuetry calculate(String(tokens[index..<endIndex])) // no exact matches in call to initializerreturn stack.popLast! // cannot reference 'mutating' method as function valuereturn stack.popLast! // method 'popLast' was used as a property; add () to call itenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
let stack = try parse(tokens)
return try pop(stack)
}
func parse(_ tokens: [Substring]) throws -> [Double] {
var stack: [Double] = []
var index = tokens.startIndex
while index != tokens.endIndex {
let token = tokens[index]
switch token {
case "+":
let right = try pop(stack)
let left = try pop(stack)
stack.append(left + right)
case "-":
let right = try pop(stack)
let left = try pop(stack)
stack.append(left - right)
case "*":
let right = try pop(stack)
let left = try pop(stack)
stack.append(left * right)
case "/":
let right = try pop(stack)
let left = try pop(stack)
stack.append(left / right)
case "(":
index = tokens.index(after: index)
case ")":
throw CalculateError.invalidInput
default:
stack.append(Double(token)!)
}
index = tokens.index(after: index)
}
return stack
}
func pop(_ stack: [Double]) throws -> Double {
guard !stack.isEmpty else {
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: " ")
let stack = try parse(tokens)
return try pop(stack)
}
func parse(_ tokens: [Substring]) throws -> [Double] {
var stack: [Double] = []
var index = tokens.startIndex
while index != tokens.endIndex {
let token = tokens[index]
switch token {
case "+":
let right = try pop(stack)
let left = try pop(stack)
stack.append(left + right)
case "-":
let right = try pop(stack)
let left = try pop(stack)
stack.append(left - right)
case "*":
let right = try pop(stack)
let left = try pop(stack)
stack.append(left * right)
case "/":
let right = try pop(stack)
let left = try pop(stack)
stack.append(left / right)
case "(":
index = tokens.index(after: index)
case ")":
throw CalculateError.invalidInput
default:
stack.append(Double(token)!)
}
index = tokens.index(after: index)
}
return stack
}
func pop(_ stack: [Double]) throws -> Double {
guard !stack.isEmpty else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
```return stack.removeLast() // cannot use mutating member on immutable value: 'stack' is a 'let' constantenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = try tokenize(string)
return try parse(tokens)
}
func tokenize(_ string: String) throws -> [Token] {
var tokens = [Token]()
var number = ""
var isNegative = false
for char in string {
switch char {
case " ":
if !number.isEmpty {
tokens.append(Token(number, isNegative))
number = ""
isNegative = false
}
case "+", "-", "*", "/", "(":
if !number.isEmpty {
tokens.append(Token(number, isNegative))
number = ""
}
tokens.append(Token(String(char), isNegative))
case ")":
if !number.isEmpty {
tokens.append(Token(number, isNegative))
number = ""
}
if tokens.isEmpty || tokens.last!.isOperator {
throw CalculateError.invalidInput
}
return tokens
default:
if !number.isEmpty {
number += String(char)
} else {
number = String(char)
}
}
}
if !number.isEmpty {
tokens.append(Token(number, isNegative))
}
return tokens
}
func parse(_ tokens: [Token]) throws -> Double {
var stack = [Double]()
for token in tokens {
switch token {
case .number(let value):
stack.append(value)
case .operator(let op):
if stack.count < 2 {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
switch op {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
}
}
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack.first!
}
enum Token {
case number(Double)
case operator(String)
}
extension Token: CustomStringConvertible {
var description: String {
switch self {
case .number(let value):
return String(value)
case .operator(let op):
return op
}
}
}
extension Token: Equatable {
static func == (lhs: Token, rhs: Token) -> Bool {
switch (lhs, rhs) {
case (.number(let lhs), .number(let rhs)):
return lhs == rhs
case (.operator(let lhs), .operator(let rhs)):
return lhs == rhs
default:
return false
}
}
}
extension Token: ExpressibleByStringLiteral {
init(stringLiteral value: String) {
self = .number(Double(value) ?? 0)
}
}
extension Token: ExpressibleByIntegerLiteral {
init(integerLiteral value: Int) {
self = .number(Double(value))
}
}
extension Token: ExpressibleByFloatLiteral {
init(floatLiteral value: Double) {
self = .number(value)
}
}
extension Token: ExpressibleByExtendedGraphemeClusterLiteral {
init(extendedGraphemeClusterLiteral value: String) {
self = .number(Double(value) ?? 0)
}
}
extension Token: ExpressibleByUnicodeScalarLiteral {
init(unicodeScalarLiteral value: String) {
self = .number(Double(value) ?? 0)
}
}
extension Token: ExpressibleByStringInterpolation {
init(stringInterpolation: StringInterpolation) {
self = .number(Double(stringInterpolation.string) ?? 0)
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = try tokenize(string)
return try parse(tokens)
}
// Tokenize string into array of tokens.
func tokenize(_ string: String) throws -> [Token] {
var tokens = [Token]()
var number = ""
var isNegative = false
for char in string {
switch char {
case " ":
if !number.isEmpty {
tokens.append(Token(number, isNegative))
number = ""
isNegative = false
}
case "+", "-", "*", "/", "(":
if !number.isEmpty {
tokens.append(Token(number, isNegative))
number = ""
}
tokens.append(Token(String(char), isNegative))
case ")":
if !number.isEmpty {
tokens.append(Token(number, isNegative))
number = ""
}
if tokens.isEmpty || tokens.last!.isOperator {
throw CalculateError.invalidInput
}
return tokens
default:
if !number.isEmpty {
number += String(char)
} else {
number = String(char)
}
}
}
if !number.isEmpty {
tokens.append(Token(number, isNegative))
}
return tokens
}
// Parse array of tokens into double value.
func parse(_ tokens: [Token]) throws -> Double {
var stack = [Double]()
for token in tokens {
switch token {
case .number(let value):
stack.append(value)
case .operator(let op):
if stack.count < 2 {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
switch op {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
}
}
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack.first!
}
enum Token {
case number(Double)
case operator(String)
}
extension Token: CustomStringConvertible {
var description: String {
switch self {
case .number(let value):
return String(value)
case .operator(let op):
return op
}
}
}
extension Token: Equatable {
static func == (lhs: Token, rhs: Token) -> Bool {
switch (lhs, rhs) {
case (.number(let lhs), .number(let rhs)):
return lhs == rhs
case (.operator(let lhs), .operator(let rhs)):
return lhs == rhs
default:
return false
}
}
}
extension Token: ExpressibleByStringLiteral {
init(stringLiteral value: String) {
self = .number(Double(value) ?? 0)
}
}
extension Token: ExpressibleByIntegerLiteral {
init(integerLiteral value: Int) {
self = .number(Double(value))
}
}
extension Token: ExpressibleByFloatLiteral {
init(floatLiteral value: Double) {
self = .number(value)
}
}
extension Token: ExpressibleByExtendedGraphemeClusterLiteral {
init(extendedGraphemeClusterLiteral value: String) {
self = .number(Double(value) ?? 0)
}
}
extension Token: ExpressibleByUnicodeScalarLiteral {
init(unicodeScalarLiteral value: String) {
self = .number(Double(value) ?? 0)
}
}
extension Token: ExpressibleByStringInterpolation {
init(stringInterpolation: StringInterpolation) {
self = .number(Double(stringInterpolation.string) ?? 0)
}
}
extension Token: CustomDebugStringConvertible {
var debugDescriptiontokens.append(Token(number, isNegative)) // extra argument in calltokens.append(Token(number, isNegative)) // extra argument in calltokens.append(Token(String(char), isNegative)) // extra argument in calltokens.append(Token(number, isNegative)) // extra argument in callif tokens.isEmpty || tokens.last!.isOperator { // value of type 'Token' has no member 'isOperator'tokens.append(Token(number, isNegative)) // extra argument in callswitch op { // switch must be exhaustivecase operator(String) // keyword 'operator' cannot be used as an identifier hereself = .number(Double(stringInterpolation.string) ?? 0) // value of type 'DefaultStringInterpolation' has no member 'string'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
let stack = try tokens.reduce(DoubleStack()) { stack, token in
try stack.push(token)
}
return try stack.pop()
}
struct DoubleStack {
private var stack: [Double] = []
mutating func push(_ token: String) throws -> DoubleStack {
switch token {
case "+":
guard let last = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! + last)
case "-":
guard let last = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! - last)
case "*":
guard let last = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! * last)
case "/":
guard let last = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! / last)
case "(":
stack.append(0)
case ")":
guard let last = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(last)
default:
guard let double = Double(token) else { throw CalculateError.invalidInput }
stack.append(double)
}
return self
}
mutating func pop() throws -> Double {
guard !stack.isEmpty else { throw CalculateError.invalidInput }
return stack.popLast!
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
let stack = try tokens.reduce(DoubleStack()) { stack, token in
try stack.push(token)
}
return try stack.pop()
}
// Stack which supports push and pop Double values.
struct DoubleStack {
private var stack: [Double] = []
mutating func push(_ token: String) throws -> DoubleStack {
switch token {
case "+":
guard let last = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! + last)
case "-":
guard let last = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! - last)
case "*":
guard let last = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! * last)
case "/":
guard let last = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(stack.popLast! / last)
case "(":
stack.append(0)
case ")":
guard let last = stack.popLast() else { throw CalculateError.invalidInput }
stack.append(last)
default:
guard let double = Double(token) else { throw CalculateError.invalidInput }
stack.append(double)
}
return self
}
mutating func pop() throws -> Double {
guard !stack.isEmpty else { throw CalculateError.invalidInput }
return stack.popLast!
}
}
```try stack.push(token) // cannot convert value of type 'String.SubSequence' (aka 'Substring') to expected argument type 'String'try stack.push(token) // cannot use mutating member on immutable value: 'stack' is a 'let' constantstack.append(stack.popLast! + last) // cannot reference 'mutating' method as function valuestack.append(stack.popLast! + last) // method 'popLast' was used as a property; add () to call itstack.append(stack.popLast! - last) // method 'popLast' was used as a property; add () to call itstack.append(stack.popLast! - last) // cannot reference 'mutating' method as function valuestack.append(stack.popLast! * last) // method 'popLast' was used as a property; add () to call itstack.append(stack.popLast! * last) // cannot reference 'mutating' method as function valuestack.append(stack.popLast! / last) // method 'popLast' was used as a property; add () to call itstack.append(stack.popLast! / last) // cannot reference 'mutating' method as function valuereturn stack.popLast! // cannot reference 'mutating' method as function valuereturn stack.popLast! // method 'popLast' was used as a property; add () to call itenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = try tokenize(string)
return try parse(tokens)
}
func tokenize(_ string: String) throws -> [String] {
var tokens = [String]()
var buffer = ""
var inNumber = false
var inParenthesis = false
for character in string {
if character.isNumber {
if !inNumber {
inNumber = true
buffer = String(character)
} else {
buffer.append(character)
}
} else {
if inNumber {
tokens.append(buffer)
inNumber = false
}
if character == "(" {
if inParenthesis {
throw CalculateError.invalidInput
}
inParenthesis = true
tokens.append(String(character))
} else if character == ")" {
if !inParenthesis {
throw CalculateError.invalidInput
}
inParenthesis = false
tokens.append(String(character))
} else {
tokens.append(String(character))
}
}
}
if inNumber {
tokens.append(buffer)
}
return tokens
}
func parse(_ tokens: [String]) throws -> Double {
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left + right)
case "-":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left - right)
case "*":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left * right)
case "/":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left / right)
case "(":
break
case ")":
break
default:
stack.append(Double(token)!)
}
}
guard let result = stack.popLast() else {
throw CalculateError.invalidInput
}
return result
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = try tokenize(string)
return try parse(tokens)
}
// Tokenize input string into tokens.
func tokenize(_ string: String) throws -> [String] {
var tokens = [String]()
var buffer = ""
var inNumber = false
var inParenthesis = false
for character in string {
if character.isNumber {
if !inNumber {
inNumber = true
buffer = String(character)
} else {
buffer.append(character)
}
} else {
if inNumber {
tokens.append(buffer)
inNumber = false
}
if character == "(" {
if inParenthesis {
throw CalculateError.invalidInput
}
inParenthesis = true
tokens.append(String(character))
} else if character == ")" {
if !inParenthesis {
throw CalculateError.invalidInput
}
inParenthesis = false
tokens.append(String(character))
} else {
tokens.append(String(character))
}
}
}
if inNumber {
tokens.append(buffer)
}
return tokens
}
// Parse tokens into result.
func parse(_ tokens: [String]) throws -> Double {
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left + right)
case "-":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left - right)
case "*":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left * right)
case "/":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left / right)
case "(":
break
case ")":
break
default:
stack.append(Double(token)!)
}
}
guard let result = stack.popLast() else {
throw CalculateError.invalidInput
}
return result
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
let stack = try parse(tokens)
return try evaluate(stack)
}
func parse(_ tokens: [Substring]) throws -> [Token] {
var stack = [Token]()
for token in tokens {
switch token {
case "+":
stack.append(.plus)
case "-":
stack.append(.minus)
case "*":
stack.append(.multiply)
case "/":
stack.append(.divide)
case "(":
stack.append(.open)
case ")":
stack.append(.close)
default:
stack.append(.number(Double(token) ?? 0))
}
}
return stack
}
func evaluate(_ stack: [Token]) throws -> Double {
var stack = stack
while !stack.isEmpty {
switch stack.removeLast() {
case let .number(number):
stack.append(number)
case let .open:
stack.append(.open)
case let .close:
guard let first = stack.popLast(), first == .open else {
throw CalculateError.invalidInput
}
guard let second = stack.popLast(), case let .number(second) = second else {
throw CalculateError.invalidInput
}
guard let operation = stack.popLast() else {
throw CalculateError.invalidInput
}
switch operation {
case .plus:
stack.append(second + first)
case .minus:
stack.append(second - first)
case .multiply:
stack.append(second * first)
case .divide:
stack.append(second / first)
}
}
}
guard let result = stack.popLast(), case let .number(result) = result else {
throw CalculateError.invalidInput
}
return result
}
enum Token {
case number(Double)
case plus
case minus
case multiply
case divide
case open
case close
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
let stack = try parse(tokens)
return try evaluate(stack)
}
func parse(_ tokens: [Substring]) throws -> [Token] {
var stack = [Token]()
for token in tokens {
switch token {
case "+":
stack.append(.plus)
case "-":
stack.append(.minus)
case "*":
stack.append(.multiply)
case "/":
stack.append(.divide)
case "(":
stack.append(.open)
case ")":
stack.append(.close)
default:
stack.append(.number(Double(token) ?? 0))
}
}
return stack
}
func evaluate(_ stack: [Token]) throws -> Double {
var stack = stack
while !stack.isEmpty {
switch stack.removeLast() {
case let .number(number):
stack.append(number)
case let .open:
stack.append(.open)
case let .close:
guard let first = stack.popLast(), first == .open else {
throw CalculateError.invalidInput
}
guard let second = stack.popLast(), case let .number(second) = second else {
throw CalculateError.invalidInput
}
guard let operation = stack.popLast() else {
throw CalculateError.invalidInput
}
switch operation {
case .plus:
stack.append(second + first)
case .minus:
stack.append(second - first)
case .multiply:
stack.append(second * first)
case .divide:
stack.append(second / first)
}
}
}
guard let result = stack.popLast(), case let .number(result) = result else {
throw CalculateError.invalidInput
}
return result
}
enum Token {
case number(Double)
case plus
case minus
case multiply
case divide
case open
case close
}
```switch stack.removeLast() { // switch must be exhaustivestack.append(number) // cannot convert value of type 'Double' to expected argument type 'Token'case let .open: // 'let' pattern has no effect; sub-pattern didn't bind any variablescase let .close: // 'let' pattern has no effect; sub-pattern didn't bind any variablesguard let first = stack.popLast(), first == .open else { // binary operator '==' cannot be applied to two 'Token' operandsswitch operation { // switch must be exhaustivestack.append(second + first) // binary operator '+' cannot be applied to operands of type 'Double' and 'Token'stack.append(second - first) // referencing operator function '-' on 'SIMD' requires that 'Token' conform to 'SIMD'stack.append(second * first) // referencing operator function '*' on 'SIMD' requires that 'Token' conform to 'SIMD'stack.append(second / first) // binary operator '/' cannot be applied to operands of type 'Double' and 'Token'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
let stack = try parse(tokens)
return try evaluate(stack)
}
func parse(_ tokens: [Substring]) throws -> [Double] {
var stack: [Double] = []
var index = tokens.startIndex
while index != tokens.endIndex {
let token = tokens[index]
switch token {
case "+":
guard let last = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(last + try parse(tokens[index...]))
case "-":
guard let last = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(last - try parse(tokens[index...]))
case "*":
guard let last = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(last * try parse(tokens[index...]))
case "/":
guard let last = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(last / try parse(tokens[index...]))
case "(":
stack.append(try parse(tokens[index...]))
case ")":
return stack
default:
guard let double = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(double)
}
index = tokens.index(after: index)
}
return stack
}
func evaluate(_ stack: [Double]) throws -> Double {
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack[0]
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
let stack = try parse(tokens)
return try evaluate(stack)
}
// Parse tokens to stack.
func parse(_ tokens: [Substring]) throws -> [Double] {
var stack: [Double] = []
var index = tokens.startIndex
while index != tokens.endIndex {
let token = tokens[index]
switch token {
case "+":
guard let last = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(last + try parse(tokens[index...]))
case "-":
guard let last = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(last - try parse(tokens[index...]))
case "*":
guard let last = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(last * try parse(tokens[index...]))
case "/":
guard let last = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(last / try parse(tokens[index...]))
case "(":
stack.append(try parse(tokens[index...]))
case ")":
return stack
default:
guard let double = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(double)
}
index = tokens.index(after: index)
}
return stack
}
// Evaluate stack.
func evaluate(_ stack: [Double]) throws -> Double {
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack[0]
}
```stack.append(last + try parse(tokens[index...])) // 'try' cannot appear to the right of a non-assignment operatorstack.append(last + try parse(tokens[index...])) // cannot convert value of type '[Double]' to expected argument type 'Double'stack.append(last + try parse(tokens[index...])) // cannot convert value of type 'Array<Substring>.SubSequence' (aka 'ArraySlice<Substring>') to expected argument type '[Substring]'stack.append(last - try parse(tokens[index...])) // 'try' cannot appear to the right of a non-assignment operatorstack.append(last - try parse(tokens[index...])) // cannot convert value of type '[Double]' to expected argument type 'Double'stack.append(last - try parse(tokens[index...])) // cannot convert value of type 'Array<Substring>.SubSequence' (aka 'ArraySlice<Substring>') to expected argument type '[Substring]'stack.append(last * try parse(tokens[index...])) // cannot convert value of type '[Double]' to expected argument type 'Double'stack.append(last * try parse(tokens[index...])) // cannot convert value of type 'Array<Substring>.SubSequence' (aka 'ArraySlice<Substring>') to expected argument type '[Substring]'stack.append(last * try parse(tokens[index...])) // 'try' cannot appear to the right of a non-assignment operatorstack.append(last / try parse(tokens[index...])) // cannot convert value of type 'Array<Substring>.SubSequence' (aka 'ArraySlice<Substring>') to expected argument type '[Substring]'stack.append(last / try parse(tokens[index...])) // 'try' cannot appear to the right of a non-assignment operatorstack.append(last / try parse(tokens[index...])) // cannot convert value of type '[Double]' to expected argument type 'Double'stack.append(try parse(tokens[index...])) // missing argument label 'contentsOf:' in callstack.append(try parse(tokens[index...])) // cannot convert value of type 'Array<Substring>.SubSequence' (aka 'ArraySlice<Substring>') to expected argument type '[Substring]'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = try tokenize(string)
let result = try parse(tokens)
return result
}
func tokenize(_ string: String) throws -> [Token] {
var tokens: [Token] = []
var token: Token?
var number: Double?
var isNegative = false
for character in string {
switch character {
case " ":
if let token = token {
tokens.append(token)
}
token = nil
number = nil
case "+", "-", "*", "/":
if let token = token {
tokens.append(token)
}
token = Token(character: character)
case "(":
if let token = token {
tokens.append(token)
}
token = Token(character: character)
case ")":
if let token = token {
tokens.append(token)
}
if let number = number {
tokens.append(Token(number: number))
}
token = Token(character: character)
case "0", "1", "2", "3", "4", "5", "6", "7", "8", "9":
if let number = number {
number = number * 10 + Double(Int(String(character)))
} else {
number = Double(Int(String(character)))
}
default:
throw CalculateError.invalidInput
}
}
if let token = token {
tokens.append(token)
}
if let number = number {
tokens.append(Token(number: number))
}
return tokens
}
func parse(_ tokens: [Token]) throws -> Double {
var stack: [Double] = []
for token in tokens {
switch token {
case let .number(number):
stack.append(number)
case let .character(character):
switch character {
case "+":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
break
case ")":
break
}
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
enum Token {
case number(Double)
case character(Character)
}
extension Token: CustomStringConvertible {
var description: String {
switch self {
case let .number(number):
return String(number)
case let .character(character):
return String(character)
}
}
}
extension Token: Equatable {
static func == (lhs: Token, rhs: Token) -> Bool {
switch (lhs, rhs) {
case let (.number(lhs), .number(rhs)):
return lhs == rhs
case let (.character(lhs), .character(rhs)):
return lhs == rhs
default:
return false
}
}
}```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 = try tokenize(string)
let result = try parse(tokens)
return result
}
// Tokenize input string to array of tokens.
func tokenize(_ string: String) throws -> [Token] {
var tokens: [Token] = []
var token: Token?
var number: Double?
var isNegative = false
for character in string {
switch character {
case " ":
if let token = token {
tokens.append(token)
}
token = nil
number = nil
case "+", "-", "*", "/":
if let token = token {
tokens.append(token)
}
token = Token(character: character)
case "(":
if let token = token {
tokens.append(token)
}
token = Token(character: character)
case ")":
if let token = token {
tokens.append(token)
}
if let number = number {
tokens.append(Token(number: number))
}
token = Token(character: character)
case "0", "1", "2", "3", "4", "5", "6", "7", "8", "9":
if let number = number {
number = number * 10 + Double(Int(String(character)))
} else {
number = Double(Int(String(character)))
}
default:
throw CalculateError.invalidInput
}
}
if let token = token {
tokens.append(token)
}
if let number = number {
tokens.append(Token(number: number))
}
return tokens
}
// Parse array of tokens to result.
func parse(_ tokens: [Token]) throws -> Double {
var stack: [Double] = []
for token in tokens {
switch token {
case let .number(number):
stack.append(number)
case let .character(character):
switch character {
case "+":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
break
case ")":
break
}
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
enum Token {
case number(Double)
case character(Character)
}
extension Token: CustomStringConvertible {
var description: String {
switch self {
case let .number(number):
return String(number)
case let .character(character):
return String(character)
}
}
}
extension Token: Equatable {
static func == (lhs: Token, rhs: Token) -> Bool {
switch (lhs, rhs) {
case let (.number(lhs), .number(rhs)):
return lhs == rhs
case let (.character(lhs), .character(rhs)):
return lhs == rhs
default:
return false
}
}
}
extension Token: Hashable {
func hash(into hasher: inout Hasher) {
switch self {
case let .number(number):
hasher.combine(number)
case let .character(character):
hastoken = Token(character: character) // 'Token' cannot be constructed because it has no accessible initializerstoken = Token(character: character) // 'Token' cannot be constructed because it has no accessible initializerstokens.append(Token(number: number)) // 'Token' cannot be constructed because it has no accessible initializerstoken = Token(character: character) // 'Token' cannot be constructed because it has no accessible initializersnumber = number * 10 + Double(Int(String(character))) // cannot assign to value: 'number' is a 'let' constantnumber = number * 10 + Double(Int(String(character))) // value of optional type 'Int?' must be unwrapped to a value of type 'Int'number = Double(Int(String(character))) // value of optional type 'Int?' must be unwrapped to a value of type 'Int'tokens.append(Token(number: number)) // 'Token' cannot be constructed because it has no accessible initializersswitch character { // switch must be exhaustivefunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}
func execute(binary: String, arguments: [String], input: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.standardInput = Pipe(data: input.data(using: .utf8)!)
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}
func execute(binary: String, arguments: [String], input: String, timeout: Int) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.standardInput = Pipe(data: input.data(using: .utf8)!)
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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], input: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.standardInput = Pipe(data: input.data(using: .utf8)!)
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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], input: String, timeout: Int) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.standardInput = Pipe(data: input.data(using: .utf8)!)
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}
```task.standardInput = Pipe(data: input.data(using: .utf8)!) // argument passed to call that takes no argumentstask.standardInput = Pipe(data: input.data(using: .utf8)!) // 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
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}
func execute(binary: String, arguments: [String], input: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.standardInput = Pipe(data: input.data(using: .utf8)!)
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}
func execute(binary: String, arguments: [String], input: String, timeout: Int) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.standardInput = Pipe(data: input.data(using: .utf8)!)
task.launch()
task.waitUntilExit(timeout: TimeInterval(timeout))
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}
func execute(binary: String, arguments: [String], input: String, timeout: Int, output: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.standardInput = Pipe(data: input.data(using: .utf8)!)
task.launch()
task.waitUntilExit(timeout: TimeInterval(timeout))
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}
func execute(binary: String, arguments: [String], input: String, timeout: Int, output: String, error: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.standardInput = Pipe(data: input.data(using: .utf8)!)
task.launch()
task.waitUntilExit(timeout: TimeInterval(timeout))
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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], input: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.standardInput = Pipe(data: input.data(using: .utf8)!)
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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], input: String, timeout: Int) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.standardInput = Pipe(data: input.data(using: .utf8)!)
task.launch()
task.waitUntilExit(timeout: TimeInterval(timeout))
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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], input: String, timeout: Int, output: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.standardInput = Pipe(data: input.data(using: .utf8)!)
task.launch()
task.waitUntilExit(timeout: TimeInterval(timeout))
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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], input: String, timeout: Int, output: String, error: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.standardInput = Pipe(data: input.data(using: .utf8)!)
task.launch()
task.waitUntilExit(timeout: TimeInterval(timeout))
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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], input: String, timeout: Int, output: String, error: String, environment: [String: String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.standardInput = Pipe(data: input.data(using: .utf8)!)
task.environment = environment
task.launch()
task.waittask.standardInput = Pipe(data: input.data(using: .utf8)!) // argument passed to call that takes no argumentstask.standardInput = Pipe(data: input.data(using: .utf8)!) // argument passed to call that takes no argumentstask.waitUntilExit(timeout: TimeInterval(timeout)) // argument passed to call that takes no argumentstask.standardInput = Pipe(data: input.data(using: .utf8)!) // argument passed to call that takes no argumentstask.waitUntilExit(timeout: TimeInterval(timeout)) // argument passed to call that takes no argumentstask.standardInput = Pipe(data: input.data(using: .utf8)!) // argument passed to call that takes no argumentstask.waitUntilExit(timeout: TimeInterval(timeout)) // argument passed to call that takes no argumentsfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
let pipe = Pipe()
let pipeErr = Pipe()
task.standardOutput = pipe
task.standardError = pipeErr
task.launchPath = binary
task.arguments = arguments
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let dataErr = pipeErr.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
let outputErr = String(data: dataErr, encoding: .utf8) ?? ""
return (output, outputErr)
}
func execute(binary: String, arguments: [String], timeout: Int) -> (String, String) {
let task = Process()
let pipe = Pipe()
let pipeErr = Pipe()
task.standardOutput = pipe
task.standardError = pipeErr
task.launchPath = binary
task.arguments = arguments
task.launch()
task.waitUntilExit(timeout: .seconds(timeout))
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let dataErr = pipeErr.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
let outputErr = String(data: dataErr, encoding: .utf8) ?? ""
return (output, outputErr)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
let pipe = Pipe()
let pipeErr = Pipe()
task.standardOutput = pipe
task.standardError = pipeErr
task.launchPath = binary
task.arguments = arguments
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let dataErr = pipeErr.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
let outputErr = String(data: dataErr, encoding: .utf8) ?? ""
return (output, outputErr)
}
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String], timeout: Int) -> (String, String) {
let task = Process()
let pipe = Pipe()
let pipeErr = Pipe()
task.standardOutput = pipe
task.standardError = pipeErr
task.launchPath = binary
task.arguments = arguments
task.launch()
task.waitUntilExit(timeout: .seconds(timeout))
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let dataErr = pipeErr.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
let outputErr = String(data: dataErr, encoding: .utf8) ?? ""
return (output, outputErr)
}
```task.waitUntilExit(timeout: .seconds(timeout)) // cannot infer contextual base in reference to member 'seconds'task.waitUntilExit(timeout: .seconds(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
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}
func execute(binary: String, arguments: [String], input: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
let inHandle = pipe.fileHandleForWriting
inHandle.write(input.data(using: .utf8)!)
inHandle.closeFile()
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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], input: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
let inHandle = pipe.fileHandleForWriting
inHandle.write(input.data(using: .utf8)!)
inHandle.closeFile()
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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], input: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
let inHandle = pipe.fileHandleForWriting
inHandle.write(input.data(using: .utf8)!)
inHandle.closeFile()
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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], input: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
let inHandle = pipe.fileHandleForWriting
inHandle.write(input.data(using: .utf8)!)
inHandle.closeFile()
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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], input: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
let inHandle = pipe.fileHandleForWriting
inHandle.write(input.data(using: .utf8)!)
inHandle.closeFile()
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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], input: String) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
let inHandle = pipe.fileHandleFor // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}
// Function // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}
// Function // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)!
return (output, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, 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 = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8 // XCTAssertTrue failedfunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}```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 { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}
func factorial(_ n: Int) -> Int {
if n == 0 {
return 1
}
return n * factorial(n - 1)
}```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 { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}
// A function that computes the factorial of a number.
func factorial(_ n: Int) -> Int {
if n == 0 {
return 1
}
return n * factorial(n - 1)
}
// A memoized version of factorial.
let memoizedFactorial = memoize(factorial)
memoizedFactorial(1000000)
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}```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 { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}```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 { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}```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 { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}
func fibonacci(_ n: Int) -> Int {
if n < 2 {
return n
}
return fibonacci(n - 1) + fibonacci(n - 2)
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}
// A function that computes the nth Fibonacci number.
func fibonacci(_ n: Int) -> Int {
if n < 2 {
return n
}
return fibonacci(n - 1) + fibonacci(n - 2)
}
// A memoized version of the Fibonacci function.
let memoizedFibonacci = memoize(fibonacci)
// Calling the memoized version of the Fibonacci function
// is much faster than calling the original function.
let n = 30
print("Fibonacci(\(n)) = \(fibonacci(n))")
print("Memoized Fibonacci(\(n)) = \(memoizedFibonacci(n))")
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}```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 { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}```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 { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}```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 { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}```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 { key in
if let value = cache[key] {
return value
}
let value = function(key)
cache[key] = value
return value
}
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
```if (--attempts == 0) { // cannot find operator '--' in scope; did you mean '-= 1'?func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
return try run(attempts: attempts) {
try task()
}
}
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
return try run(attempts: attempts) {
try task()
}
}
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if attempts == 0 {
throw error
}
attempts -= 1
}
}
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
return try run(attempts: attempts) {
try task()
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
return try run(attempts: attempts) {
try task()
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if attempts == 0 {
throw error
}
attempts -= 1
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if attempts == 0 {
throw error
}
attempts -= 1
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if attempts == 0 {
throw error
}
attempts -= 1
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if attempts == 0 {
throw error
}
attempts -= 1
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if attempts == 0 {
throw error
}
attempts -= 1
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if attempts == 0 {
throw error
}
attempts -= 1
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if attempts == 0 {
throw error
}
attempts -= 1
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if attempts == 0 {
throw error
}
attempts -= 1
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if attempts == 0 {
throw error
}
attempts -= 1
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func run<T>(attempts: Int, task: () throws -> T) rethrows ->func run<T>(attempts: Int, task: () throws -> T) rethrows -> T { // invalid redeclaration of 'run(attempts:task:)'func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while attempts > 0 {
do {
return try task()
} catch {
attempts -= 1
if attempts == 0 {
throw error
}
}
}
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while attempts > 0 {
do {
return try task()
} catch {
attempts -= 1
if attempts == 0 {
throw error
}
}
}
}
```} // missing return in global function expected to return 'T'func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> Tif (--attempts == 0) { // cannot find operator '--' in scope; did you mean '-= 1'?func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T { // invalid redeclaration of 'retry(attempts:task:)'if (--attempts == 0) { // cannot find operator '--' in scope; did you mean '-= 1'?func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
do {
return try task()
} catch {
if (attempts == 1) {
throw error
}
return try retry(attempts: attempts - 1, task: task)
}
}
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
return try retry(attempts: attempts, task: task)
}```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 {
do {
return try task()
} catch {
if (attempts == 1) {
throw error
}
return try retry(attempts: attempts - 1, task: task)
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
return try retry(attempts: attempts, task: task)
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T { // invalid redeclaration of 'retry(attempts:task:)'return try retry(attempts: attempts, task: task) // call can throw, but the error is not handled; a function declared 'rethrows' may only throw if its parameter doesfunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
```if (--attempts == 0) { // cannot find operator '--' in scope; did you mean '-= 1'?func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
return try run(attempts: attempts) {
try task()
}
}
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
var attemptsRemaining = attempts
while true {
do {
return try task()
} catch {
guard attemptsRemaining > 0 else { throw error }
--attemptsRemaining
}
}
}
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
return try run(attempts: attempts) {
try task()
}
}```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 {
return try run(attempts: attempts) {
try task()
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
var attemptsRemaining = attempts
while true {
do {
return try task()
} catch {
guard attemptsRemaining > 0 else { throw error }
--attemptsRemaining
}
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
return try run(attempts: attempts) {
try task()
}
}
// Retry mechanism that retries a task a specified number of times before failing.
func run<T>(attempts: Int, task: () throws -> T) rethrows -> T {
var attemptsRemaining = attempts
while true {
do {
return try task()
} catch {
guard attemptsRemaining > 0 else { throw error }
--attemptsRemaining
}
}
}
```--attemptsRemaining // cannot find operator '--' in scope; did you mean '-= 1'?func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T { // invalid redeclaration of 'retry(attempts:task:)'func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
```if (--attempts == 0) { // cannot find operator '--' in scope; did you mean '-= 1'?func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while true {
do {
return try task()
} catch {
if (--attempts == 0) {
throw error
}
}
}
}
```if (--attempts == 0) { // cannot find operator '--' in scope; did you mean '-= 1'?func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
do {
return try task()
} catch {
guard attempts > 1 else { throw error }
return try retry(attempts: attempts - 1, task: task)
}
}```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 {
do {
return try task()
} catch {
guard attempts > 1 else { throw error }
return try retry(attempts: attempts - 1, task: task)
}
}
```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()
}
}
```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
}
}```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
}
}
```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
}
}```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
}
}
```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 Car {
let engine: Engine
let tires: Tires
init(engine: Engine, tires: Tires) {
self.engine = engine
self.tires = tires
}
}
class Engine {
let horsePower: Int
init(horsePower: Int) {
self.horsePower = horsePower
}
}
class Tires {
let numberOfTires: Int
init(numberOfTires: Int) {
self.numberOfTires = numberOfTires
}
}```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
}
}
// MARK: - Example
class Car {
let engine: Engine
let tires: Tires
init(engine: Engine, tires: Tires) {
self.engine = engine
self.tires = tires
}
}
class Engine {
let horsePower: Int
init(horsePower: Int) {
self.horsePower = horsePower
}
}
class Tires {
let numberOfTires: Int
init(numberOfTires: Int) {
self.numberOfTires = numberOfTires
}
}
let container = DIContainer()
container.register(Engine.self) { Engine(horsePower: 100) }
container.register(Tires.self) { Tires(numberOfTires: 4) }
container.register(Car.self) { Car(engine: container.resolve(Engine.self)!, tires: container.resolve(Tires.self)!) }
let car = container.resolve(Car.self)
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [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
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registry = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[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 registry = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}
// MARK: - Usage
let container = DIContainer()
container.register(Car.self) {
Car(color: .red)
}
if let car = container.resolve(Car.self) {
print(car)
}
container.register(Car.self) {
Car(color: .blue)
}
if let car = container.resolve(Car.self) {
print(car)
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registry = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[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 registry = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}
```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
}
}```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
}
}
```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
}
}```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
}
}
// Usage
let container = DIContainer()
container.register(Person.self) {
Person(name: "John")
}
let person = container.resolve(Person.self)
print(person?.name) // John
```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
}
}```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
}
}
```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
self.transitions = [:]
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition registered for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
class FiniteStateMachine<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
private var transitions: [State: [Event: State]]
required init(state: State) {
self.transitions = [:]
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][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
self.transitions = [:]
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition registered for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// State machine with predefined transitions between states.
class FiniteStateMachine<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
private var transitions: [State: [Event: State]]
required init(state: State) {
self.transitions = [:]
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// State machine with predefined transitions between states.
class FiniteStateMachine<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
private var transitions: [State: [Event: State]]
required init(state: State) {
self.transitions = [:]
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// State machine with predefined transitions between states.
class FiniteStateMachine<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
private var transitions: [State: [Event: State]]
required init(state: State) {
self.transitions = [:]
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// State machine with predefined transitions between states.
class FiniteStateMachine<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
private var transitions: [State: [Event: State]]
required init(state: State) {
self.transitions = [:]
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// State machine with predefined transitions between states.
class FiniteStateMachine<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
private var transitions: [State: [Event: State]]
required init(state: State) {
self.transitions = [:]
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// State machine with predefined transitions between states.
class FiniteStateMachine<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
private var transitions: [State: [Event: State]]
required init(state: State) {
self.transitions = [:]
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// State machine with predefined transitions between states.
class FiniteStateMachine<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
private var transitions: [State: [Event: State]]
required init(state: State) {
self.transitions = [:]
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// State machine with predefined transitions between states.
private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'func registerTransition(from: State, to: State, event: Event) { // overriding declaration requires an 'override' keywordprotocol 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 transitions: [Transition] = []
private var state: State
private var transition: Transition?
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transition else { return }
guard transition.event == event else { return }
state = transition.to
transition = nil
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
class StateMachineWithPredefinedTransitions<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
required init(state: State) {
super.init(state: state)
registerTransition(from: .state1, to: .state2, event: .event1)
registerTransition(from: .state2, to: .state3, event: .event2)
}
}
class StateMachineWithCustomTransitions<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
required init(state: State) {
super.init(state: state)
registerTransition(from: .state1, to: .state2, event: .event1)
registerTransition(from: .state2, to: .state3, event: .event2)
}
override func trigger(event: Event) {
guard let transition = transition else { return }
guard transition.event == event else { return }
state = transition.to
transition = nil
}
override func registerTransition(from: State, to: State, event: Event) {
transition = Transition(from: from, to: to, event: event)
}
}
enum State: Hashable {
case state1
case state2
case state3
}
enum Event: Hashable {
case event1
case event2
}```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 transitions: [Transition] = []
private var state: State
private var transition: Transition?
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transition else { return }
guard transition.event == event else { return }
state = transition.to
transition = nil
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
// State machine with predefined transitions.
class StateMachineWithPredefinedTransitions<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
required init(state: State) {
super.init(state: state)
registerTransition(from: .state1, to: .state2, event: .event1)
registerTransition(from: .state2, to: .state3, event: .event2)
}
}
// State machine with custom transitions.
class StateMachineWithCustomTransitions<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
required init(state: State) {
super.init(state: state)
registerTransition(from: .state1, to: .state2, event: .event1)
registerTransition(from: .state2, to: .state3, event: .event2)
}
override func trigger(event: Event) {
guard let transition = transition else { return }
guard transition.event == event else { return }
state = transition.to
transition = nil
}
override func registerTransition(from: State, to: State, event: Event) {
transition = Transition(from: from, to: to, event: event)
}
}
enum State: Hashable {
case state1
case state2
case state3
}
enum Event: Hashable {
case event1
case event2
}
let stateMachineWithPredefinedTransitions = StateMachineWithPredefinedTransitions(state: .state1)
stateMachineWithPredefinedTransitions.trigger(event: .event1)
stateMachineWithPredefinedTransitions.trigger(event: .event2)
let stateMachineWithCustomTransitions = StateMachineWithCustomTransitions(state: .state1)
stateMachineWithCustomTransitions.trigger(event: .event1)
stateMachineWithCustomTransitions.trigger(event: .event2)
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'transition = nil // cannot assign to value: 'transition' is a 'let' constanttransition = nil // 'nil' cannot be assigned to type '(from: State, to: State, event: Event)'registerTransition(from: .state1, to: .state2, event: .event1) // type 'State' has no member 'state2'registerTransition(from: .state1, to: .state2, event: .event1) // type 'State' has no member 'state1'registerTransition(from: .state1, to: .state2, event: .event1) // type 'Event' has no member 'event1'registerTransition(from: .state2, to: .state3, event: .event2) // type 'State' has no member 'state3'registerTransition(from: .state2, to: .state3, event: .event2) // type 'Event' has no member 'event2'registerTransition(from: .state2, to: .state3, event: .event2) // type 'State' has no member 'state2'registerTransition(from: .state1, to: .state2, event: .event1) // type 'State' has no member 'state2'registerTransition(from: .state1, to: .state2, event: .event1) // type 'Event' has no member 'event1'registerTransition(from: .state1, to: .state2, event: .event1) // type 'State' has no member 'state1'registerTransition(from: .state2, to: .state3, event: .event2) // type 'State' has no member 'state3'registerTransition(from: .state2, to: .state3, event: .event2) // type 'State' has no member 'state2'registerTransition(from: .state2, to: .state3, event: .event2) // type 'Event' has no member 'event2'guard let transition = transition else { return } // 'transition' is inaccessible due to 'private' protection leveltransition = Transition(from: from, to: to, event: event) // 'transition' is inaccessible due to 'private' protection levelprotocol 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
}
func trigger(event: Event) {
guard let newState = transitions[state]?[event] else {
return
}
state = newState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][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
}
func trigger(event: Event) {
guard let newState = transitions[state]?[event] else {
return
}
state = newState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// MARK: -
// State machine with custom transitions.
let stateMachine = StateMachine<String, String>(state: "A")
stateMachine.registerTransition(from: "A", to: "B", event: "B")
stateMachine.registerTransition(from: "A", to: "C", event: "C")
stateMachine.registerTransition(from: "B", to: "A", event: "A")
stateMachine.registerTransition(from: "C", to: "B", event: "B")
stateMachine.registerTransition(from: "C", to: "A", event: "A")
stateMachine.trigger(event: "B")
stateMachine.trigger(event: "B")
stateMachine.trigger(event: "A")
stateMachine.trigger(event: "C")
stateMachine.trigger(event: "C")
stateMachine.trigger(event: "A")
stateMachine.trigger(event: "B")
stateMachine.trigger(event: "B")
stateMachine.trigger(event: "A")
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
typealias Transition = (from: State, to: State, event: Event)
private var transitions: [Transition] = []
private var state: State
private var transitionsMap: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let to = transitionsMap[state]?[event] else {
return
}
state = to
}
func registerTransition(from: State, to: State, event: Event) {
transitionsMap[from, default: [:]][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 {
typealias Transition = (from: State, to: State, event: Event)
private var transitions: [Transition] = []
private var state: State
private var transitionsMap: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let to = transitionsMap[state]?[event] else {
return
}
state = to
}
func registerTransition(from: State, to: State, event: Event) {
transitionsMap[from, default: [:]][event] = to
}
}
// MARK: -
// State machine with custom transitions between states.
let stateMachine = StateMachine<String, String>(state: "A")
stateMachine.registerTransition(from: "A", to: "B", event: "B")
stateMachine.registerTransition(from: "B", to: "C", event: "C")
stateMachine.registerTransition(from: "C", to: "A", event: "A")
stateMachine.trigger(event: "B")
stateMachine.trigger(event: "C")
stateMachine.trigger(event: "A")
stateMachine.trigger(event: "B")
stateMachine.trigger(event: "C")
stateMachine.trigger(event: "A")
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
typealias Transition = (from: State, to: State, event: Event)
private var transitions: [Transition] = []
private var currentState: State
private var transitionsByEvent: [Event: [Transition]] = [:]
private var transitionsByState: [State: [Transition]] = [:]
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let transitions = transitionsByEvent[event] else {
fatalError("No transition registered for event \(event)")
}
guard let transition = transitions.first(where: { $0.from == currentState }) else {
fatalError("No transition registered from state \(currentState) for event \(event)")
}
currentState = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
transitionsByEvent[event, default: []].append(Transition(from: from, to: to, event: event))
transitionsByState[from, default: []].append(Transition(from: from, to: to, event: event))
}
}
class StateMachineWithPredefinedTransitions<State: Hashable, Event: Hashable>: StateMachineProtocol {
typealias Transition = (from: State, to: State, event: Event)
private var transitions: [Transition] = []
private var currentState: State
private var transitionsByEvent: [Event: [Transition]] = [:]
private var transitionsByState: [State: [Transition]] = [:]
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let transitions = transitionsByEvent[event] else {
fatalError("No transition registered for event \(event)")
}
guard let transition = transitions.first(where: { $0.from == currentState }) else {
fatalError("No transition registered from state \(currentState) for event \(event)")
}
currentState = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
transitionsByEvent[event, default: []].append(Transition(from: from, to: to, event: event))
transitionsByState[from, default: []].append(Transition(from: from, to: to, event: event))
}
func registerTransitions(from: State, to: State, events: [Event]) {
for event in events {
registerTransition(from: from, to: to, event: event)
}
}
func registerTransitions(from: State, to: State, events: StateMachineWithPredefinedTransitions<State, Event>.Transition...) {
registerTransitions(from: from, to: to, events: events)
}
}```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 transitions: [Transition] = []
private var currentState: State
private var transitionsByEvent: [Event: [Transition]] = [:]
private var transitionsByState: [State: [Transition]] = [:]
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let transitions = transitionsByEvent[event] else {
fatalError("No transition registered for event \(event)")
}
guard let transition = transitions.first(where: { $0.from == currentState }) else {
fatalError("No transition registered from state \(currentState) for event \(event)")
}
currentState = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
transitionsByEvent[event, default: []].append(Transition(from: from, to: to, event: event))
transitionsByState[from, default: []].append(Transition(from: from, to: to, event: event))
}
}
// State machine with predefined transitions between states.
class StateMachineWithPredefinedTransitions<State: Hashable, Event: Hashable>: StateMachineProtocol {
typealias Transition = (from: State, to: State, event: Event)
private var transitions: [Transition] = []
private var currentState: State
private var transitionsByEvent: [Event: [Transition]] = [:]
private var transitionsByState: [State: [Transition]] = [:]
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let transitions = transitionsByEvent[event] else {
fatalError("No transition registered for event \(event)")
}
guard let transition = transitions.first(where: { $0.from == currentState }) else {
fatalError("No transition registered from state \(currentState) for event \(event)")
}
currentState = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
transitionsByEvent[event, default: []].append(Transition(from: from, to: to, event: event))
transitionsByState[from, default: []].append(Transition(from: from, to: to, event: event))
}
func registerTransitions(from: State, to: State, events: [Event]) {
for event in events {
registerTransition(from: from, to: to, event: event)
}
}
func registerTransitions(from: State, to: State, events: StateMachineWithPredefinedTransitions<State, Event>.Transition...) {
registerTransitions(from: from, to: to, events: events)
}
}
// State machine with predefined transitions between states.
class StateMachineWithPredefinedTransitions2<State: Hashable, Event: Hashable>: StateMachineProtocol {
typealias Transition = (from: State, to: State, event: Event)
private var transitions: [Transition] = []
private var currentState: State
private var transitionsByEvent: [Event: [Transition]] = [:]
private var transitionsByState: [State: [Transition]] = [:]
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let transitions = transitionsByEvent[event] else {
fatalError("No transition registered for event \(event)")
}
guard let transition = transinit(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachineWithPredefinedTransitions<State, Event>'registerTransitions(from: from, to: to, events: events) // no exact matches in call to instance method 'registerTransitions'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 transitions: [Transition] = []
private var currentState: State
private var transitionsMap: [State: [Event: State]] = [:]
private var transitionsInvoked: [Transition] = []
required init(state: State) {
currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitionsMap[state]?[event] else {
fatalError("No transition registered for state \(state) and event \(event)")
}
transitionsInvoked.append(Transition(from: state, to: nextState, event: event))
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
transitionsMap[from, default: [:]][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 {
typealias Transition = (from: State, to: State, event: Event)
private var transitions: [Transition] = []
private var currentState: State
private var transitionsMap: [State: [Event: State]] = [:]
private var transitionsInvoked: [Transition] = []
required init(state: State) {
currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitionsMap[state]?[event] else {
fatalError("No transition registered for state \(state) and event \(event)")
}
transitionsInvoked.append(Transition(from: state, to: nextState, event: event))
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
transitionsMap[from, default: [:]][event] = to
}
}
// MARK: - Example
let stateMachine = StateMachine<String, String>(state: "A")
stateMachine.registerTransition(from: "A", to: "B", event: "a")
stateMachine.registerTransition(from: "B", to: "C", event: "b")
stateMachine.registerTransition(from: "C", to: "D", event: "c")
stateMachine.registerTransition(from: "D", to: "E", event: "d")
stateMachine.registerTransition(from: "E", to: "F", event: "e")
stateMachine.registerTransition(from: "F", to: "A", event: "f")
stateMachine.trigger(event: "a")
stateMachine.trigger(event: "b")
stateMachine.trigger(event: "c")
stateMachine.trigger(event: "d")
stateMachine.trigger(event: "e")
stateMachine.trigger(event: "f")
print(stateMachine.transitionsInvoked)
// [
// (from: "A", to: "B", event: "a"),
// (from: "B", to: "C", event: "b"),
// (from: "C", to: "D", event: "c"),
// (from: "D", to: "E", event: "d"),
// (from: "E", to: "F", event: "e"),
// (from: "F", to: "A", event: "f")
// ]
```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 transitions: [Transition] = []
private var currentState: State
private var transitionsByState: [State: [Transition]] = [:]
private var transitionsByEvent: [Event: [Transition]] = [:]
required init(state: State) {
currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let transition = transitionsByEvent[event]?.first(where: { $0.from == currentState }) else {
return
}
currentState = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append((from: from, to: to, event: event))
transitionsByState[from, default: []].append((from: from, to: to, event: event))
transitionsByEvent[event, default: []].append((from: from, to: to, event: event))
}
}
enum State: Hashable {
case idle
case running
case paused
}
enum Event: Hashable {
case start
case pause
case resume
case stop
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
typealias Transition = (from: State, to: State, event: Event)
private var transitions: [Transition] = []
private var currentState: State
private var transitionsByState: [State: [Transition]] = [:]
private var transitionsByEvent: [Event: [Transition]] = [:]
required init(state: State) {
currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let transition = transitionsByEvent[event]?.first(where: { $0.from == currentState }) else {
return
}
currentState = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append((from: from, to: to, event: event))
transitionsByState[from, default: []].append((from: from, to: to, event: event))
transitionsByEvent[event, default: []].append((from: from, to: to, event: event))
}
}
// MARK: - Example
enum State: Hashable {
case idle
case running
case paused
}
enum Event: Hashable {
case start
case pause
case resume
case stop
}
let stateMachine = StateMachine<State, Event>(state: .idle)
stateMachine.registerTransition(from: .idle, to: .running, event: .start)
stateMachine.registerTransition(from: .running, to: .paused, event: .pause)
stateMachine.registerTransition(from: .paused, to: .running, event: .resume)
stateMachine.registerTransition(from: .running, to: .idle, event: .stop)
stateMachine.trigger(event: .start)
stateMachine.trigger(event: .pause)
stateMachine.trigger(event: .resume)
stateMachine.trigger(event: .stop)
```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 transitions: [Transition] = []
private var currentState: State
private var transitionsMap: [State: [Transition]] = [:]
required init(state: State) {
currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let transition = transitionsMap[state]?.first(where: { $0.event == event }) else {
fatalError("No transition registered for \(state) with event \(event)")
}
currentState = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
transitionsMap[from, default: []].append(Transition(from: from, to: to, event: event))
}
}
class StateMachineWithPredefinedTransitions<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
override init(state: State) {
super.init(state: state)
registerTransitions()
}
func registerTransitions() {
registerTransition(from: .state1, to: .state2, event: .event1)
registerTransition(from: .state2, to: .state3, event: .event2)
registerTransition(from: .state3, to: .state1, event: .event3)
}
}
class StateMachineWithCustomTransitions<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
override init(state: State) {
super.init(state: state)
registerTransitions()
}
func registerTransitions() {
registerTransition(from: .state1, to: .state2, event: .event1)
registerTransition(from: .state2, to: .state3, event: .event2)
registerTransition(from: .state3, to: .state1, event: .event3)
}
override func registerTransition(from: State, to: State, event: Event) {
super.registerTransition(from: from, to: to, event: event)
registerTransition(from: to, to: from, event: event)
}
}
enum State: Hashable {
case state1
case state2
case state3
}
enum Event: Hashable {
case event1
case event2
case event3
}```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 transitions: [Transition] = []
private var currentState: State
private var transitionsMap: [State: [Transition]] = [:]
required init(state: State) {
currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let transition = transitionsMap[state]?.first(where: { $0.event == event }) else {
fatalError("No transition registered for \(state) with event \(event)")
}
currentState = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
transitionsMap[from, default: []].append(Transition(from: from, to: to, event: event))
}
}
// State machine with predefined transitions between states.
class StateMachineWithPredefinedTransitions<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
override init(state: State) {
super.init(state: state)
registerTransitions()
}
func registerTransitions() {
registerTransition(from: .state1, to: .state2, event: .event1)
registerTransition(from: .state2, to: .state3, event: .event2)
registerTransition(from: .state3, to: .state1, event: .event3)
}
}
// State machine with predefined transitions between states and possibility to register custom transitions.
class StateMachineWithCustomTransitions<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
override init(state: State) {
super.init(state: state)
registerTransitions()
}
func registerTransitions() {
registerTransition(from: .state1, to: .state2, event: .event1)
registerTransition(from: .state2, to: .state3, event: .event2)
registerTransition(from: .state3, to: .state1, event: .event3)
}
override func registerTransition(from: State, to: State, event: Event) {
super.registerTransition(from: from, to: to, event: event)
registerTransition(from: to, to: from, event: event)
}
}
enum State: Hashable {
case state1
case state2
case state3
}
enum Event: Hashable {
case event1
case event2
case event3
}
let stateMachine = StateMachineWithCustomTransitions(state: .state1)
stateMachine.trigger(event: .event1)
stateMachine.trigger(event: .event2)
stateMachine.trigger(event: .event3)
stateMachine.trigger(event: .event1)
stateMachine.trigger(event: .event2)
stateMachine.trigger(event: .event3)
```override init(state: State) { // use the 'required' modifier to override a required initializerregisterTransition(from: .state1, to: .state2, event: .event1) // type 'Event' has no member 'event1'registerTransition(from: .state1, to: .state2, event: .event1) // type 'State' has no member 'state2'registerTransition(from: .state1, to: .state2, event: .event1) // type 'State' has no member 'state1'registerTransition(from: .state2, to: .state3, event: .event2) // type 'State' has no member 'state2'registerTransition(from: .state2, to: .state3, event: .event2) // type 'State' has no member 'state3'registerTransition(from: .state2, to: .state3, event: .event2) // type 'Event' has no member 'event2'registerTransition(from: .state3, to: .state1, event: .event3) // type 'Event' has no member 'event3'registerTransition(from: .state3, to: .state1, event: .event3) // type 'State' has no member 'state3'registerTransition(from: .state3, to: .state1, event: .event3) // type 'State' has no member 'state1'override init(state: State) { // use the 'required' modifier to override a required initializerregisterTransition(from: .state1, to: .state2, event: .event1) // type 'State' has no member 'state2'registerTransition(from: .state1, to: .state2, event: .event1) // type 'Event' has no member 'event1'registerTransition(from: .state1, to: .state2, event: .event1) // type 'State' has no member 'state1'registerTransition(from: .state2, to: .state3, event: .event2) // type 'State' has no member 'state2'registerTransition(from: .state2, to: .state3, event: .event2) // type 'Event' has no member 'event2'registerTransition(from: .state2, to: .state3, event: .event2) // type 'State' has no member 'state3'registerTransition(from: .state3, to: .state1, event: .event3) // type 'State' has no member 'state3'registerTransition(from: .state3, to: .state1, event: .event3) // type 'Event' has no member 'event3'registerTransition(from: .state3, to: .state1, event: .event3) // type 'State' has no member 'state1'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 transitions: [Transition] = []
private var currentState: State
required init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.from == currentState && $0.event == event }) else {
fatalError("No transition found for state: \(currentState) and event: \(event)")
}
currentState = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
enum State: Hashable {
case initial
case first
case second
case third
}
enum Event: Hashable {
case first
case second
case third
}```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 transitions: [Transition] = []
private var currentState: State
required init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.from == currentState && $0.event == event }) else {
fatalError("No transition found for state: \(currentState) and event: \(event)")
}
currentState = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
// MARK: - Example
enum State: Hashable {
case initial
case first
case second
case third
}
enum Event: Hashable {
case first
case second
case third
}
let stateMachine = StateMachine<State, Event>(state: .initial)
stateMachine.registerTransition(from: .initial, to: .first, event: .first)
stateMachine.registerTransition(from: .first, to: .second, event: .second)
stateMachine.registerTransition(from: .second, to: .third, event: .third)
stateMachine.trigger(event: .first)
stateMachine.trigger(event: .second)
stateMachine.trigger(event: .third)
```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 transitions: [State: [Event: State]] = [:]
private var currentState: State
private var transitionsFromCurrentState: [Event: State]
required init(state: State) {
self.currentState = state
self.transitionsFromCurrentState = [:]
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitionsFromCurrentState[event] else {
fatalError("No transition registered for \(event) from \(currentState)")
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
transitionsFromCurrentState[event] = to
}
}
class StateMachineWithPredefinedTransitions<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
private var transitionsFromCurrentState: [Event: State]
required init(state: State) {
self.currentState = state
self.transitionsFromCurrentState = [:]
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitionsFromCurrentState[event] else {
fatalError("No transition registered for \(event) from \(currentState)")
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
transitionsFromCurrentState[event] = to
}
}
class StateMachineWithPredefinedTransitions2<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
private var transitionsFromCurrentState: [Event: State]
required init(state: State) {
self.currentState = state
self.transitionsFromCurrentState = [:]
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitionsFromCurrentState[event] else {
fatalError("No transition registered for \(event) from \(currentState)")
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
transitionsFromCurrentState[event] = to
}
}
class StateMachineWithPredefinedTransitions3<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
private var transitionsFromCurrentState: [Event: State]
required init(state: State) {
self.currentState = state
self.transitionsFromCurrentState = [:]
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitionsFromCurrentState[event] else {
fatalError("No transition registered for \(event) from \(currentState)")
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
transitionsFromCurrentState[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 transitions: [State: [Event: State]] = [:]
private var currentState: State
private var transitionsFromCurrentState: [Event: State]
required init(state: State) {
self.currentState = state
self.transitionsFromCurrentState = [:]
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitionsFromCurrentState[event] else {
fatalError("No transition registered for \(event) from \(currentState)")
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
transitionsFromCurrentState[event] = to
}
}
// State machine with predefined transitions between states.
class StateMachineWithPredefinedTransitions<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
private var transitionsFromCurrentState: [Event: State]
required init(state: State) {
self.currentState = state
self.transitionsFromCurrentState = [:]
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitionsFromCurrentState[event] else {
fatalError("No transition registered for \(event) from \(currentState)")
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
transitionsFromCurrentState[event] = to
}
}
// State machine with predefined transitions between states.
class StateMachineWithPredefinedTransitions2<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
private var transitionsFromCurrentState: [Event: State]
required init(state: State) {
self.currentState = state
self.transitionsFromCurrentState = [:]
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitionsFromCurrentState[event] else {
fatalError("No transition registered for \(event) from \(currentState)")
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
transitionsFromCurrentState[event] = to
}
}
// State machine with predefined transitions between states.
class StateMachineWithPredefinedTransitions3<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
private var transitionsFromCurrentState: [Event: State]
required init(state: State) {
self.currentState = state
self.transitionsFromCurrentState = [:]
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitionsFromCurrentState[event] else {
fatalError("No transition registered for \(event) from \(currentState)")
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
transitionsFromCurrentState[event] = to
}
}
// State machine with predefined transitions between states.
class StateMachineWithPredefinedTransitions4<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
private var trans // XCTAssertEqual failed: (red) is not equal to (yellow)indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.treeDepth
}
}
}
struct FileSystem {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
init(files: [String: Int]) {
let nodes = files.map { name, size in
.file(name: name, size: size)
}
self.init(root: .directory(name: "/", contents: nodes))
}
func totalSize() -> Int {
return root.totalSize
}
func filesCount() -> Int {
return root.filesCount
}
func treeDepth() -> Int {
return root.treeDepth
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.treeDepth
}
}
}
// File system manager.
// Used to create file system nodes and calculate total size of all files in file system, files count and file system tree depth.
struct FileSystem {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
init(files: [String: Int]) {
let nodes = files.map { name, size in
.file(name: name, size: size)
}
self.init(root: .directory(name: "/", contents: nodes))
}
func totalSize() -> Int {
return root.totalSize
}
func filesCount() -> Int {
return root.filesCount
}
func treeDepth() -> Int {
return root.treeDepth
}
}
// File system manager.
// Used to create file system nodes and calculate total size of all files in file system, files count and file system tree depth.
struct FileSystem {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
init(files: [String: Int]) {
let nodes = files.map { name, size in
.file(name: name, size: size)
}
self.init(root: .directory(name: "/", contents: nodes))
}
func totalSize() -> Int {
return root.totalSize
}
func filesCount() -> Int {
return root.filesCount
}
func treeDepth() -> Int {
return root.treeDepth
}
}
// File system manager.
// Used to create file system nodes and calculate total size of all files in file system, files count and file system tree depth.
struct FileSystem {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
init(files: [String: Int]) {
let nodes = files.map { name, size in
.file(name: name, size: size)
}
self.init(root: .directory(name: "/", contents: nodes))
}
func totalSize() -> Int {
return root.totalSize
}
func filesCount() -> Int {
return root.filesCount
}
func treeDepth() -> Int {
return root.treeDepth
}
}
// File system manager.
// Used to create file system nodes and calculate total size of all files in file system, files count and file system tree depth.
struct FileSystem {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
init(files: [String: Int]) {
let nodes = files.map { name, size in
.file(name: name, size: size)
}
self.init(root: .directory(name: "/", contents: nodes))
}
func totalSize() -> Int {
return root.totalSize
}
func filesCount() -> Int {
return root.filesCount
}
func treeDepth() -> Int {
return root.treeDepth
}
}
// File system manager.
// Used to create file system nodes and calculate total size of all files in file system, files count and file system tree depth.
struct FileSystem {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
initreturn contents.totalSize // value of type '[FileSystemNode]' has no member 'totalSize'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn contents.filesCount // value of type '[FileSystemNode]' has no member 'filesCount'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn contents.treeDepth // value of type '[FileSystemNode]' has no member 'treeDepth'.file(name: name, size: size) // cannot infer contextual base in reference to member 'file'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 0
case let .directory(_, contents):
return 1 + contents.treeDepth.max()
}
}
}
class FileSystem {
private var root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func print() {
print(root)
}
}
extension FileSystem {
convenience init(totalSize: Int, filesCount: Int, treeDepth: Int) {
let root = createFileSystem(totalSize: totalSize, filesCount: filesCount, treeDepth: treeDepth)
self.init(root: root)
}
private func createFileSystem(totalSize: Int, filesCount: Int, treeDepth: Int) -> FileSystemNode {
let size = totalSize / filesCount
let name = "file_\(filesCount)"
let file = FileSystemNode.file(name: name, size: size)
if treeDepth == 0 {
return file
}
let contents = (0..<filesCount).map { _ in
createFileSystem(totalSize: totalSize, filesCount: filesCount, treeDepth: treeDepth - 1)
}
return FileSystemNode.directory(name: "dir_\(filesCount)", contents: contents)
}
}
extension FileSystem {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 0
case let .directory(_, contents):
return 1 + contents.treeDepth.max()
}
}
}
// File system manager.
// Used to create file system and print it.
class FileSystem {
private var root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func print() {
print(root)
}
}
// File system creation.
// Used to create file system from file system metadata.
extension FileSystem {
convenience init(totalSize: Int, filesCount: Int, treeDepth: Int) {
let root = createFileSystem(totalSize: totalSize, filesCount: filesCount, treeDepth: treeDepth)
self.init(root: root)
}
private func createFileSystem(totalSize: Int, filesCount: Int, treeDepth: Int) -> FileSystemNode {
let size = totalSize / filesCount
let name = "file_\(filesCount)"
let file = FileSystemNode.file(name: name, size: size)
if treeDepth == 0 {
return file
}
let contents = (0..<filesCount).map { _ in
createFileSystem(totalSize: totalSize, filesCount: filesCount, treeDepth: treeDepth - 1)
}
return FileSystemNode.directory(name: "dir_\(filesCount)", contents: contents)
}
}
// File system metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystem {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
// File system creation.
// Used to create file system from file system metadata.
extension FileSystem {
convenience init(totalSize: Int, filesCount: Int, treeDepth: Int) {
let root = createFileSystem(totalSize: totalSize, filesCount: filesCount, treeDepth: treeDepth)
self.init(root: root)
}
private func createFileSystem(totalSize: Int, filesCount: Int, treeDepth: Int) -> FileSystemNode {
let size = totalSize / filesCount
let name = "file_\(filesCount)"
let file = FileSystemNode.file(name: name, size: size)
if treeDepth == 0 {
return file
}
let contents = (0..<filesCount).map { _ in
createFileSystem(totalSize: totalSize, filesCount: filesCount, treeDepth: treeDepth - 1)
}
return FileSystemNode.directory(name: "dir_\(filesCount)", contents: contents)
}
}
// File system metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystem {
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.treeDepth
}
}
// File system creation.
// Used to create file system from file system metadata.
extension FileSystem {
convenience init(totalSize: Int, filesCount: Int, treeDepth: Int) {
let root = createFileSystem(totalSize: totalSize, filesCount: filesCount, treeDepth: treeDepth)
self.init(root: root)
}return contents.totalSize // value of type '[FileSystemNode]' has no member 'totalSize'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn contents.filesCount // value of type '[FileSystemNode]' has no member 'filesCount'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn 1 + contents.treeDepth.max() // value of type '[FileSystemNode]' has no member 'treeDepth'print(root) // use of 'print' refers to instance method rather than global function 'print(_:separator:terminator:)' in module 'Swift'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return 1 + contents.treeDepth
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return 1 + contents.treeDepth
}
}
}
// Concrete file system manager.
// Used to create file system from given file system description.
final class FileSystem {
private let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
convenience init(description: String) {
let nodes = description.split(separator: "\n")
.map { $0.split(separator: " ").map(String.init) }
.map {
switch $0.first {
case "file":
return .file(name: $0[1], size: Int($0[2])!)
case "dir":
return .directory(name: $0[1], contents: [])
default:
fatalError("Unknown file system node type: \(String($0.first!))")
}
}
let root = nodes.reduce(into: []) { nodes, node in
switch node {
case let .directory(name, contents):
nodes.append(contents)
nodes.append(FileSystemNode.directory(name: name, contents: contents))
case let .file(name, size):
nodes.append(FileSystemNode.file(name: name, size: size))
}
}.first!
self.init(root: root)
}
}
// MARK: - Tests
let fileSystem = FileSystem(description: """
dir /
file a 10
file b 20
dir c
file d 30
file e 40
dir d
file f 50
file g 60
""")
let totalSize = fileSystem.root.totalSize
let filesCount = fileSystem.root.filesCount
let treeDepth = fileSystem.root.treeDepth
print("Total size: \(totalSize)")
print("Files count: \(filesCount)")
print("Tree depth: \(treeDepth)")
```return contents.totalSize // value of type '[FileSystemNode]' has no member 'totalSize'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn contents.filesCount // value of type '[FileSystemNode]' has no member 'filesCount'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn 1 + contents.treeDepth // value of type '[FileSystemNode]' has no member 'treeDepth'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return 1 + contents.treeDepth
}
}
}
struct FileSystem {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func printTree() {
print(root)
}
}
struct FileSystemBuilder {
private var nodes: [String: FileSystemNode] = [:]
mutating func addFile(name: String, size: Int) {
nodes[name] = .file(name: name, size: size)
}
mutating func addDirectory(name: String, contents: [FileSystemNode]) {
nodes[name] = .directory(name: name, contents: contents)
}
func build() -> FileSystemNode {
return nodes.values.reduce(into: .directory(name: "", contents: [])) { result, node in
switch node {
case let .file(name, size):
result.contents.append(.file(name: name, size: size))
case let .directory(name, contents):
result.contents.append(.directory(name: name, contents: contents))
}
}
}
}
struct FileSystemPrinter {
private let indent: String
init(indent: String = " ") {
self.indent = indent
}
func print(_ node: FileSystemNode) {
switch node {
case let .file(name, size):
print(name, size)
case let .directory(name, contents):
print(name)
for content in contents {
print(indent, content)
}
}
}
}
struct FileSystemManager {
let fileSystem: FileSystem
init(root: FileSystemNode) {
let builder = FileSystemBuilder()
builder.addDirectory(name: "root", contents: [
.file(name: "file1", size: 100),
.file(name: "file2", size: 200),
.directory(name: "dir1", contents: [
.file(name: "file3", size: 300),
.file(name: "file4", size: 400),
]),
.directory(name: "dir2", contents: [
.file(name: "file5", size: 500),
.file(name: "file6", size: 600),
]),
])
self.fileSystem = FileSystem(root: builder.build())
}
func printTree() {
fileSystem.printTree()
}
}
struct FileSystemMetadataCalculator {
let fileSystem: FileSystemInfo
init(fileSystem: FileSystemInfo) {
self.fileSystem = fileSystem
}
func printMetadata() {
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return 1 + contents.treeDepth
}
}
}
// File system manager.
// Used to create file system tree and print it.
struct FileSystem {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func printTree() {
print(root)
}
}
// File system tree builder.
// Used to create file system tree.
struct FileSystemBuilder {
private var nodes: [String: FileSystemNode] = [:]
mutating func addFile(name: String, size: Int) {
nodes[name] = .file(name: name, size: size)
}
mutating func addDirectory(name: String, contents: [FileSystemNode]) {
nodes[name] = .directory(name: name, contents: contents)
}
func build() -> FileSystemNode {
return nodes.values.reduce(into: .directory(name: "", contents: [])) { result, node in
switch node {
case let .file(name, size):
result.contents.append(.file(name: name, size: size))
case let .directory(name, contents):
result.contents.append(.directory(name: name, contents: contents))
}
}
}
}
// File system tree printer.
// Used to print file system tree.
struct FileSystemPrinter {
private let indent: String
init(indent: String = " ") {
self.indent = indent
}
func print(_ node: FileSystemNode) {
switch node {
case let .file(name, size):
print(name, size)
case let .directory(name, contents):
print(name)
for content in contents {
print(indent, content)
}
}
}
}
// File system tree builder and printer.
// Used to create file system tree and print it.
struct FileSystemManager {
let fileSystem: FileSystem
init(root: FileSystemNode) {
let builder = FileSystemBuilder()
builder.addDirectory(name: "root", contents: [
.file(name: "file1", size: 100),
.file(name: "file2", size: 200),
.directory(name: "dir1", contents: [
.file(name: "file3", size: 300),
.file(name: "file4", size: 400),
]),
.directory(name: "dir2", contents: [
.file(name: "file5", size: 500),
.file(name: "file6", size: 600),
]),
])
self.fileSystem = FileSystem(root: builder.build())
}
func printTree() {
fileSystem.printTree()
}
}
// File system tree metadata calculator.
// Used to calculate total size of all files in file system, files count and file system tree depth.
struct FileSystemMetadataCalculator {
let fileSystem: FileSystemInfo
init(fileSystem: FileSystemInfo) {
self.fileSystem = fileSystem
}
func printMetadata() {
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
}
}
let fileSystemManager = FileSystemManager(root: .directory(name: "root", contents: [
.file(name:return contents.totalSize // value of type '[FileSystemNode]' has no member 'totalSize'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn contents.filesCount // value of type '[FileSystemNode]' has no member 'filesCount'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn 1 + contents.treeDepth // value of type '[FileSystemNode]' has no member 'treeDepth'result.contents.append(.file(name: name, size: size)) // cannot infer contextual base in reference to member 'file'result.contents.append(.file(name: name, size: size)) // value of type 'FileSystemNode' has no member 'contents'print(name, size) // use of 'print' refers to instance method rather than global function 'print(_:separator:terminator:)' in module 'Swift'print(name) // cannot convert value of type 'String' to expected argument type 'FileSystemNode'print(indent, content) // use of 'print' refers to instance method rather than global function 'print(_:separator:terminator:)' in module 'Swift'builder.addDirectory(name: "root", contents: [ // cannot use mutating member on immutable value: 'builder' is a 'let' constantindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 0
case let .directory(_, contents):
return contents.treeDepth + 1
}
}
}
struct FileSystem {
let root: FileSystemNode
init(description: String) {
let lines = description.split(separator: "\n")
let nodes = lines.map(FileSystemNode.init)
root = nodes.reduce(into: .directory(name: "", contents: [])) {
$0.add($1)
}
}
func add(_ node: FileSystemNode) {
switch self.root {
case let .directory(name, contents):
if let index = contents.firstIndex(where: { $0.name == node.name }) {
contents[index] = node
} else {
contents.append(node)
}
default:
fatalError("Can't add node to non-directory node")
}
}
}
struct FileSystemInfoCalculator {
let fileSystem: FileSystem
var totalSize: Int {
fileSystem.root.totalSize
}
var filesCount: Int {
fileSystem.root.filesCount
}
var treeDepth: Int {
fileSystem.root.treeDepth
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 0
case let .directory(_, contents):
return contents.treeDepth + 1
}
}
}
// Concrete file system manager.
// Used to create file system tree from given file system description.
struct FileSystem {
let root: FileSystemNode
init(description: String) {
let lines = description.split(separator: "\n")
let nodes = lines.map(FileSystemNode.init)
root = nodes.reduce(into: .directory(name: "", contents: [])) {
$0.add($1)
}
}
func add(_ node: FileSystemNode) {
switch self.root {
case let .directory(name, contents):
if let index = contents.firstIndex(where: { $0.name == node.name }) {
contents[index] = node
} else {
contents.append(node)
}
default:
fatalError("Can't add node to non-directory node")
}
}
}
// Concrete file system metadata calculator.
// Used to calculate total size of all files in file system, files count and file system tree depth.
struct FileSystemInfoCalculator {
let fileSystem: FileSystem
var totalSize: Int {
fileSystem.root.totalSize
}
var filesCount: Int {
fileSystem.root.filesCount
}
var treeDepth: Int {
fileSystem.root.treeDepth
}
}
// Tests.
let fileSystem = FileSystem(description: """
a 1
b 2
c 3
d 4
e 5
f 6
g 7
h 8
i 9
j 10
k 11
l 12
m 13
n 14
o 15
p 16
q 17
r 18
s 19
t 20
u 21
v 22
w 23
x 24
y 25
z 26
""")
let fileSystemInfo = FileSystemInfoCalculator(fileSystem: fileSystem)
print("Total size: \(fileSystemInfo.totalSize)")
print("Files count: \(fileSystemInfo.filesCount)")
print("Tree depth: \(fileSystemInfo.treeDepth)")
```return contents.totalSize // value of type '[FileSystemNode]' has no member 'totalSize'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn contents.filesCount // value of type '[FileSystemNode]' has no member 'filesCount'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn contents.treeDepth + 1 // value of type '[FileSystemNode]' has no member 'treeDepth'let nodes = lines.map(FileSystemNode.init) // 'FileSystemNode' cannot be constructed because it has no accessible initializerslet nodes = lines.map(FileSystemNode.init) // generic parameter 'T' could not be inferredroot = nodes.reduce(into: .directory(name: "", contents: [])) { // cannot infer contextual base in reference to member 'directory'if let index = contents.firstIndex(where: { $0.name == node.name }) { // value of type 'FileSystemNode' has no member 'name'if let index = contents.firstIndex(where: { $0.name == node.name }) { // value of type 'FileSystemNode' has no member 'name'contents.append(node) // cannot use mutating member on immutable value: 'contents' is immutableindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 0
case let .directory(_, contents):
return 1 + contents.treeDepth
}
}
}
class FileSystem {
private var root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func createFile(name: String, size: Int) {
root = .file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) {
root = .directory(name: name, contents: contents)
}
func totalSize() -> Int {
return root.totalSize
}
func filesCount() -> Int {
return root.filesCount
}
func treeDepth() -> Int {
return root.treeDepth
}
}
class FileSystemFactory {
private let fileSystem: FileSystem
init(fileSystem: FileSystem) {
self.fileSystem = fileSystem
}
func createFile(name: String, size: Int) {
fileSystem.createFile(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) {
fileSystem.createDirectory(name: name, contents: contents)
}
func totalSize() -> Int {
return fileSystem.totalSize()
}
func filesCount() -> Int {
return fileSystem.filesCount()
}
func treeDepth() -> Int {
return fileSystem.treeDepth()
}
}
class FileSystemFactoryFactory {
private let fileSystemFactory: FileSystemFactory
init(fileSystemFactory: FileSystemFactory) {
self.fileSystemFactory = fileSystemFactory
}
func createFile(name: String, size: Int) {
fileSystemFactory.createFile(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) {
fileSystemFactory.createDirectory(name: name, contents: contents)
}
func totalSize() -> Int {
return fileSystemFactory.totalSize()
}
func filesCount() -> Int {
return fileSystemFactory.filesCount()
}
func treeDepth() -> Int {
return fileSystemFactory.treeDepth()
}
}
class FileSystemFactoryFactoryFactory {
private let fileSystemFactoryFactory: FileSystemFactoryFactory
init(fileSystemFactoryFactory: FileSystemFactoryFactory) {
self.fileSystemFactoryFactory = fileSystemFactoryFactory
}
func createFile(name: String, size: Int) {
fileSystemFactoryFactory.createFile(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) {
fileSystemFactoryFactory.createDirectory(name: name, contents: contents)
}
func totalSize() -> Int {
return fileSystemFactoryFactory.totalSize()
}
func filesCount() -> Int {
return fileSystemFactoryFactory.filesCount()
}
func treeDepth() -> Int {
return fileSystemFactoryFactory.treeDepth()
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 0
case let .directory(_, contents):
return 1 + contents.treeDepth
}
}
}
// File system manager.
// Used to create file system and perform operations on it.
class FileSystem {
private var root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func createFile(name: String, size: Int) {
root = .file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) {
root = .directory(name: name, contents: contents)
}
func totalSize() -> Int {
return root.totalSize
}
func filesCount() -> Int {
return root.filesCount
}
func treeDepth() -> Int {
return root.treeDepth
}
}
// File system manager factory.
// Used to create file system and perform operations on it.
class FileSystemFactory {
private let fileSystem: FileSystem
init(fileSystem: FileSystem) {
self.fileSystem = fileSystem
}
func createFile(name: String, size: Int) {
fileSystem.createFile(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) {
fileSystem.createDirectory(name: name, contents: contents)
}
func totalSize() -> Int {
return fileSystem.totalSize()
}
func filesCount() -> Int {
return fileSystem.filesCount()
}
func treeDepth() -> Int {
return fileSystem.treeDepth()
}
}
// File system manager factory factory.
// Used to create file system manager factory.
class FileSystemFactoryFactory {
private let fileSystemFactory: FileSystemFactory
init(fileSystemFactory: FileSystemFactory) {
self.fileSystemFactory = fileSystemFactory
}
func createFile(name: String, size: Int) {
fileSystemFactory.createFile(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) {
fileSystemFactory.createDirectory(name: name, contents: contents)
}
func totalSize() -> Int {
return fileSystemFactory.totalSize()
}
func filesCount() -> Int {
return fileSystemFactory.filesCount()
}
func treeDepth() -> Int {
return fileSystemFactory.treeDepth()
}
}
// File system manager factory factory factory.
// Used to create file system manager factory factory.
class FileSystemFactoryFactoryFactory {
private let fileSystemFactoryFactory: FileSystemFactoryFactory
init(fileSystemFactoryFactory: FileSystemFactoryFactory) {
self.fileSystemFactoryFactory = fileSystemFactoryFactory
}
func createFile(name: String, size: Int) {
fileSystemFactoryFactory.createFile(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) {
fileSystemFactoryFactory.createDirectory(name: name, contents: contents)
}
func totalSize() -> Int {
return fileSystemFactoryFactory.totalSize()
}
func filesCount() -> Int {
return fileSystemFactoryFactory.filesCount()
}
func treeDepth() -> Int {
return fileSystemFactoryFactory.treeDepth()
}
}
```return contents.totalSize // value of type '[FileSystemNode]' has no member 'totalSize'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn contents.filesCount // value of type '[FileSystemNode]' has no member 'filesCount'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn 1 + contents.treeDepth // value of type '[FileSystemNode]' has no member 'treeDepth'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.treeDepth
}
}
}
struct FileSystem {
let root: FileSystemNode
init(description: String) {
let nodes = description.components(separatedBy: "\n")
.map(FileSystemNode.init)
root = FileSystemNode.directory(name: "/", contents: nodes)
}
}
extension FileSystemNode: ExpressibleByStringLiteral {
init(stringLiteral value: String) {
let components = value.components(separatedBy: " ")
switch components.count {
case 2:
self = .file(name: components[0], size: Int(components[1])!)
case 3:
self = .directory(name: components[0], contents: [FileSystemNode(stringLiteral: components[2])])
default:
preconditionFailure("Invalid file system description")
}
}
}
extension FileSystemNode: CustomStringConvertible {
var description: String {
switch self {
case let .file(name, size):
return "\(name) \(size)"
case let .directory(name, contents):
return "\(name) \(contents.map { $0.description }.joined(separator: "\n"))"
}
}
}
extension FileSystemNode: CustomDebugStringConvertible {
var debugDescription: String {
switch self {
case let .file(name, size):
return "\(name) \(size)"
case let .directory(name, contents):
return "\(name) \(contents.map { $0.debugDescription }.joined(separator: "\n"))"
}
}
}
extension FileSystemNode: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
switch self {
case let .file(name, size):
return "\(name) \(size)"
case let .directory(name, contents):
return "\(name) \(contents.map { $0.playgroundDescription }.joined(separator: "\n"))"
}
}
}
extension FileSystemNode: CustomReflectable {
var customMirror: Mirror {
switch self {
case let .file(name, size):
return Mirror(self, children: ["name": name, "size": size])
case let .directory(name, contents):
return Mirror(self, children: ["name": name, "contents": contents])
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.treeDepth
}
}
}
// File system manager.
// Used to create file system from given file system description.
struct FileSystem {
let root: FileSystemNode
init(description: String) {
let nodes = description.components(separatedBy: "\n")
.map(FileSystemNode.init)
root = FileSystemNode.directory(name: "/", contents: nodes)
}
}
// File system description.
// Used to create file system from given file system description.
extension FileSystemNode: ExpressibleByStringLiteral {
init(stringLiteral value: String) {
let components = value.components(separatedBy: " ")
switch components.count {
case 2:
self = .file(name: components[0], size: Int(components[1])!)
case 3:
self = .directory(name: components[0], contents: [FileSystemNode(stringLiteral: components[2])])
default:
preconditionFailure("Invalid file system description")
}
}
}
// File system description.
// Used to create file system from given file system description.
extension FileSystemNode: CustomStringConvertible {
var description: String {
switch self {
case let .file(name, size):
return "\(name) \(size)"
case let .directory(name, contents):
return "\(name) \(contents.map { $0.description }.joined(separator: "\n"))"
}
}
}
// File system description.
// Used to create file system from given file system description.
extension FileSystemNode: CustomDebugStringConvertible {
var debugDescription: String {
switch self {
case let .file(name, size):
return "\(name) \(size)"
case let .directory(name, contents):
return "\(name) \(contents.map { $0.debugDescription }.joined(separator: "\n"))"
}
}
}
// File system description.
// Used to create file system from given file system description.
extension FileSystemNode: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
switch self {
case let .file(name, size):
return "\(name) \(size)"
case let .directory(name, contents):
return "\(name) \(contents.map { $0.playgroundDescription }.joined(separator: "\n"))"
}
}
}
// File system description.
// Used to create file system from given file system description.
extension FileSystemNode: CustomReflectable {
var customMirror: Mirror {
switch self {
case let .file(name, size):
return Mirror(self, children: ["name": name, "size": size])
case let .directory(name, contents):
return Mirror(self, children: ["name": name, "contents": contents])
}
}
}
// File system description.
// Used to create file system from given file system description.
extension FileSystemNode: CustomStringConvertible {
var description: String {
switch self {
case let .file(name, size):
return "\(name) \(size)"
case let .directory(name, contents):
return "\(name) \(contents.map { $0.description }.joined(separator: "\n"))"
}
}
}
// File system description.
// Used to create file system from given file system description.
extension FileSystemNode: CustomDebugStringConvertible {
var debugDescription: String {
return contents.totalSize // value of type '[FileSystemNode]' has no member 'totalSize'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn contents.filesCount // value of type '[FileSystemNode]' has no member 'filesCount'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn contents.treeDepth // value of type '[FileSystemNode]' has no member 'treeDepth'return "\(name) \(contents.map { $0.playgroundDescription }.joined(separator: "\n"))" // cannot convert value of type 'Any' to closure result type 'String'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
struct FileSystem {
let root: FileSystemNode
init(data: [String]) {
var nodes = [FileSystemNode]()
for line in data {
let components = line.components(separatedBy: " ")
let name = components[0]
let size = Int(components[1])!
if components.count == 2 {
nodes.append(.file(name: name, size: size))
} else {
let subnodes = components.dropFirst(2).map { FileSystemNode(name: $0, size: size) }
nodes.append(.directory(name: name, contents: subnodes))
}
}
root = .directory(name: "/", contents: nodes)
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
// File system manager.
// Used to create file system tree from file system data.
struct FileSystem {
let root: FileSystemNode
init(data: [String]) {
var nodes = [FileSystemNode]()
for line in data {
let components = line.components(separatedBy: " ")
let name = components[0]
let size = Int(components[1])!
if components.count == 2 {
nodes.append(.file(name: name, size: size))
} else {
let subnodes = components.dropFirst(2).map { FileSystemNode(name: $0, size: size) }
nodes.append(.directory(name: name, contents: subnodes))
}
}
root = .directory(name: "/", contents: nodes)
}
}
// File system data.
// Used to create file system tree from file system data.
let data = [
"bin 4096",
"boot 1024",
"dev 1024",
"etc 4096",
"home 4096",
"lib 4096",
"lib64 4096",
"mnt 1024",
"opt 1024",
"root 1024",
"run 1024",
"sbin 4096",
"srv 1024",
"sys 1024",
"tmp 1024",
"usr 4096",
"var 4096",
"usr/bin 4096",
"usr/lib 4096",
"usr/lib64 4096",
"usr/sbin 4096",
"usr/share 4096",
"usr/share/man 4096",
"usr/share/man/man1 4096",
"usr/share/man/man1/cat.1 1024",
"usr/share/man/man1/chgrp.1 1024",
"usr/share/man/man1/chmod.1 1024",
"usr/share/man/man1/chown.1 1024",
"usr/share/man/man1/cp.1 1024",
"usr/share/man/man1/date.1 1024",
"usr/share/man/man1/dd.1 1024",
"usr/share/man/man1/df.1 1024",
"usr/share/man/man1/echo.1 1024",
"usr/share/man/man1/false.1 1024",
"usr/share/man/man1/fdisk.1 1024",
"usr/share/man/man1/finger.1 1024",
"usr/share/man/man1/find.1 1024",
"usr/share/man/man1/grep.1 1024",
"usr/share/man/man1/gunzip.1 1024",
"usr/sharecase let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablescase let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variableslet subnodes = components.dropFirst(2).map { FileSystemNode(name: $0, size: size) } // 'FileSystemNode' cannot be constructed because it has no accessible initializersindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return 1 + contents.treeDepth
}
}
}
struct FileSystem {
let root: FileSystemNode
init(description: [String]) {
var nodes = [FileSystemNode]()
for line in description {
let components = line.split(separator: " ").map(String.init)
if components.count == 2 {
let name = components[0]
let size = Int(components[1])!
nodes.append(.file(name: name, size: size))
} else if components.count == 3 {
let name = components[0]
let size = Int(components[1])!
let contents = components[2].split(separator: ",").map(String.init).map {
FileSystem(description: [$0]).root
}
nodes.append(.directory(name: name, contents: contents))
}
}
self.root = .directory(name: "", contents: nodes)
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return 1 + contents.treeDepth
}
}
}
// File system manager.
// Used to create file system from file system description.
struct FileSystem {
let root: FileSystemNode
init(description: [String]) {
var nodes = [FileSystemNode]()
for line in description {
let components = line.split(separator: " ").map(String.init)
if components.count == 2 {
let name = components[0]
let size = Int(components[1])!
nodes.append(.file(name: name, size: size))
} else if components.count == 3 {
let name = components[0]
let size = Int(components[1])!
let contents = components[2].split(separator: ",").map(String.init).map {
FileSystem(description: [$0]).root
}
nodes.append(.directory(name: name, contents: contents))
}
}
self.root = .directory(name: "", contents: nodes)
}
}
// File system description.
// Used to create file system from file system description.
let fileSystemDescription = [
"100 100",
"200 200",
"300 300",
"400 400",
"500 500",
"600 600",
"700 700",
"800 800",
"900 900",
"1000 1000",
"1100 1100",
"1200 1200",
"1300 1300",
"1400 1400",
"1500 1500",
"1600 1600",
"1700 1700",
"1800 1800",
"1900 1900",
"2000 2000",
"2100 2100",
"2200 2200",
"2300 2300",
"2400 2400",
"2500 2500",
"2600 2600",
"2700 2700",
"2800 2800",
"2900 2900",
"3000 3000",
"3100 3100",
"3200 3200",
"3300 3300",
"3400 3400",
"3500 3500",
"3600 3600",
"3700 3700",
"3800 3800",
"3900 3900",
"4000 4000",
"4100 4100",
"4200 4200",
"4300 4300",
"4400 4400",
"4500 4500",
"4600 4600",
"4700 47return contents.totalSize // value of type '[FileSystemNode]' has no member 'totalSize'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn contents.filesCount // value of type '[FileSystemNode]' has no member 'filesCount'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn 1 + contents.treeDepth // value of type '[FileSystemNode]' has no member 'treeDepth'let size = Int(components[1])! // initialization of immutable value 'size' was never used; consider replacing with assignment to '_' or removing itindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return 1 + contents.treeDepth
}
}
}
protocol FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode
}
struct FileSystemManagerImpl: FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return .file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return .directory(name: name, contents: contents)
}
}
extension FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return .file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return .directory(name: name, contents: contents)
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let .file(_, size):
return size
case let .directory(_, contents):
return contents.totalSize
}
}
var filesCount: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return contents.filesCount
}
}
var treeDepth: Int {
switch self {
case let .file(_, _):
return 1
case let .directory(_, contents):
return 1 + contents.treeDepth
}
}
}
// File system manager.
// Used to create file system nodes.
protocol FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode
}
// File system manager implementation.
// Used to create file system nodes.
struct FileSystemManagerImpl: FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return .file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return .directory(name: name, contents: contents)
}
}
// File system manager protocol extension.
// Used to create file system nodes.
extension FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return .file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return .directory(name: name, contents: contents)
}
}
// File system manager protocol extension.
// Used to create file system nodes.
extension FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return .file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return .directory(name: name, contents: contents)
}
}
// File system manager protocol extension.
// Used to create file system nodes.
extension FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return .file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return .directory(name: name, contents: contents)
}
}
// File system manager protocol extension.
// Used to create file system nodes.
extension FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return .file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return .directory(name: name, contents: contents)
}
}
// File system manager protocol extension.
// Used to create file system nodes.
extension FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return .file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return .directory(name: name, contents: contents)
}
}
// File system manager protocol extension.
// Used to create file system nodes.
extension FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return .file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return .directory(name: name, contents: contents)
}
}
// File system manager protocol extension.
// Used to create file system nodes.
extension FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return .file(name: name, size: size)
}
func createDirectory(name: String, contents:return contents.totalSize // value of type '[FileSystemNode]' has no member 'totalSize'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn contents.filesCount // value of type '[FileSystemNode]' has no member 'filesCount'case let .file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn 1 + contents.treeDepth // value of type '[FileSystemNode]' has no member 'treeDepth'protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
typealias Element = Element
var items = [Element]()
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 {
typealias Element = Element
var items = [Element]()
init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack of integers.
let stack = Stack<Int>()
stack.push(1)
stack.push(2)
stack.push(3)
stack.push(4)
stack.pop()
stack.pop()
stack.pop()
stack.pop()
// Stack of strings.
let stack2 = Stack<String>()
stack2.push("a")
stack2.push("b")
stack2.push("c")
stack2.push("d")
stack2.pop()
stack2.pop()
stack2.pop()
stack2.pop()
```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 {
private var items: [Element] = []
init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Person {
let name: String
init(name: String) {
self.name = name
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var items: [Element] = []
init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack of integers.
let stack = Stack<Int>()
stack.push(1)
stack.push(2)
stack.push(3)
stack.push(4)
// Stack of strings.
let stack2 = Stack<String>()
stack2.push("a")
stack2.push("b")
stack2.push("c")
stack2.push("d")
// Stack of custom types.
class Person {
let name: String
init(name: String) {
self.name = name
}
}
let stack3 = Stack<Person>()
stack3.push(Person(name: "Alice"))
stack3.push(Person(name: "Bob"))
stack3.push(Person(name: "Charlie"))
stack3.push(Person(name: "Dave"))
```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 stack = Stack<Int>()
stack.push(1)
stack.push(2)
stack.push(3)
stack.pop()
stack.pop()
stack.pop()
// Stack of strings.
let stringStack = Stack<String>()
stringStack.push("a")
stringStack.push("b")
stringStack.push("c")
stringStack.pop()
stringStack.pop()
stringStack.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<T>: StackProtocol {
typealias Element = T
private var items = [T]()
init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
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<T>: StackProtocol {
typealias Element = T
private var items = [T]()
init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Stack of integers.
let stack = Stack<Int>()
stack.push(1)
stack.push(2)
stack.push(3)
stack.pop()
stack.pop()
stack.pop()
// Stack of strings.
let stringStack = Stack<String>()
stringStack.push("a")
stringStack.push("b")
stringStack.push("c")
stringStack.pop()
stringStack.pop()
stringStack.pop()
```init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<T>'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<T>: StackProtocol {
typealias Element = T
private var items = [T]()
init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
class IntStack: Stack<Int> {
override init() {
super.init()
}
}
class StringStack: Stack<String> {
override init() {
super.init()
}
}
class DoubleStack: Stack<Double> {
override init() {
super.init()
}
}
class BoolStack: Stack<Bool> {
override init() {
super.init()
}
}
class CharacterStack: Stack<Character> {
override init() {
super.init()
}
}
class AnyStack: Stack<Any> {
override init() {
super.init()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
private var items = [T]()
init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Concrete stack with a specific type.
class IntStack: Stack<Int> {
override init() {
super.init()
}
}
// Concrete stack with a specific type.
class StringStack: Stack<String> {
override init() {
super.init()
}
}
// Concrete stack with a specific type.
class DoubleStack: Stack<Double> {
override init() {
super.init()
}
}
// Concrete stack with a specific type.
class BoolStack: Stack<Bool> {
override init() {
super.init()
}
}
// Concrete stack with a specific type.
class CharacterStack: Stack<Character> {
override init() {
super.init()
}
}
// Concrete stack with a specific type.
class AnyStack: Stack<Any> {
override init() {
super.init()
}
}
```init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<T>'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 Int
let stack = Stack<Int>()
stack.push(1)
stack.push(2)
stack.push(3)
stack.pop()
stack.pop()
stack.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: AnyObject>: StackProtocol {
private var items = [Element]()
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: AnyObject>: StackProtocol {
private var items = [Element]()
init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack of integers.
let intStack = Stack<Int>()
intStack.push(1)
intStack.push(2)
intStack.push(3)
// Stack of strings.
let stringStack = Stack<String>()
stringStack.push("a")
stringStack.push("b")
stringStack.push("c")
// Stack of any object.
let objectStack = Stack<AnyObject>()
objectStack.push(1 as AnyObject)
objectStack.push("a" as AnyObject)
objectStack.push(2 as AnyObject)
```init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'var stack = Stack<Int>() // 'Stack' requires that 'Int' be a class typeprotocol 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 stack = Stack<Int>()
stack.push(1)
stack.push(2)
stack.push(3)
stack.pop()
stack.pop()
stack.pop()
// Stack of strings.
let stringStack = Stack<String>()
stringStack.push("a")
stringStack.push("b")
stringStack.push("c")
stringStack.pop()
stringStack.pop()
stringStack.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<T>: StackProtocol {
typealias Element = T
private var elements: [T] = []
required init() {}
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
class IntStack: StackProtocol {
typealias Element = Int
private var elements: [Int] = []
required init() {}
func push(_ element: Int) {
elements.append(element)
}
func pop() -> Int? {
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<T>: StackProtocol {
typealias Element = T
private var elements: [T] = []
required init() {}
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Non-generic stack with push and pop functions.
class IntStack: StackProtocol {
typealias Element = Int
private var elements: [Int] = []
required init() {}
func push(_ element: Int) {
elements.append(element)
}
func pop() -> Int? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
private var elements: [T] = []
required init() {}
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Non-generic stack with push and pop functions.
class IntStack: StackProtocol {
typealias Element = Int
private var elements: [Int] = []
required init() {}
func push(_ element: Int) {
elements.append(element)
}
func pop() -> Int? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
private var elements: [T] = []
required init() {}
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Non-generic stack with push and pop functions.
class IntStack: StackProtocol {
typealias Element = Int
private var elements: [Int] = []
required init() {}
func push(_ element: Int) {
elements.append(element)
}
func pop() -> Int? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
private var elements: [T] = []
required init() {}
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Non-generic stack with push and pop functions.
class IntStack: StackProtocol {
typealias Element = Int
private var elements: [Int] = []
required init() {}
func push(_ element: Int) {
elements.append(element)
}
func pop() -> Int? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
private var elements: [T] = []
required init() {}
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Non-generic stack with push and pop functions.
class IntStack: StackProtocol {
typealias Element = Int
private var elements: [Int] = []
required init() {}
func push(_ element: Int) {
elements.append(element)
}
func pop() -> Int? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
private var elements: [T] = []
required init() {}
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Non-generic stack with push and pop functions.
class IntStack: StackProtocol {
typealias Element = Int
private var elements: [Int] = []
required init() {}
func push(_ element: Int) {
elements.append(element)
}
func 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<T> : StackProtocol {
typealias Element = T
private var elements: [T] = []
required init() {}
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
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<T> : StackProtocol {
typealias Element = T
private var elements: [T] = []
required init() {}
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Stack of integers.
let intStack = Stack<Int>()
intStack.push(1)
intStack.push(2)
intStack.push(3)
intStack.pop()
// Stack of strings.
let stringStack = Stack<String>()
stringStack.push("a")
stringStack.push("b")
stringStack.push("c")
stringStack.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 cache: [Key: Element]
private var head: Node<Key, Element>?
private var tail: Node<Key, Element>?
private var count: Int
private var capacity: Int
required init(capacity: Int) {
self.capacity = capacity
self.count = 0
self.cache = [:]
}
subscript(key: Key) -> Element? {
get {
guard let node = cache[key] else { return nil }
moveToHead(node)
return node.value
}
set {
guard let newValue = newValue else {
if let node = cache[key] {
remove(node)
}
return
}
if let node = cache[key] {
node.value = newValue
moveToHead(node)
} else {
let node = Node(key: key, value: newValue)
cache[key] = node
addToHead(node)
count += 1
if count > capacity {
removeTail()
}
}
}
}
private func addToHead(_ node: Node<Key, Element>) {
node.next = head
head = node
if tail == nil {
tail = node
}
}
private func moveToHead(_ node: Node<Key, Element>) {
guard head != node else { return }
if let prev = node.prev {
prev.next = node.next
} else {
tail = node.next
}
node.next?.prev = node.prev
addToHead(node)
}
private func remove(_ node: Node<Key, Element>) {
guard head != node, tail != node else { return }
node.prev?.next = node.next
node.next?.prev = node.prev
if head == node {
head = node.next
}
if tail == node {
tail = node.prev
}
count -= 1
}
private func removeTail() {
guard let node = tail else { return }
remove(node)
}
}
private class Node<Key: Hashable, Element>: Hashable {
let key: Key
var value: Element
var prev: Node<Key, Element>?
var next: Node<Key, Element>?
init(key: Key, value: Element) {
self.key = key
self.value = value
}
func hash(into hasher: inout Hasher) {
hasher.combine(key)
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var head: Node<Key, Element>?
private var tail: Node<Key, Element>?
private var count: Int
private var capacity: Int
required init(capacity: Int) {
self.capacity = capacity
self.count = 0
self.cache = [:]
}
subscript(key: Key) -> Element? {
get {
guard let node = cache[key] else { return nil }
moveToHead(node)
return node.value
}
set {
guard let newValue = newValue else {
if let node = cache[key] {
remove(node)
}
return
}
if let node = cache[key] {
node.value = newValue
moveToHead(node)
} else {
let node = Node(key: key, value: newValue)
cache[key] = node
addToHead(node)
count += 1
if count > capacity {
removeTail()
}
}
}
}
private func addToHead(_ node: Node<Key, Element>) {
node.next = head
head = node
if tail == nil {
tail = node
}
}
private func moveToHead(_ node: Node<Key, Element>) {
guard head != node else { return }
if let prev = node.prev {
prev.next = node.next
} else {
tail = node.next
}
node.next?.prev = node.prev
addToHead(node)
}
private func remove(_ node: Node<Key, Element>) {
guard head != node, tail != node else { return }
node.prev?.next = node.next
node.next?.prev = node.prev
if head == node {
head = node.next
}
if tail == node {
tail = node.prev
}
count -= 1
}
private func removeTail() {
guard let node = tail else { return }
remove(node)
}
}
private class Node<Key: Hashable, Element>: Hashable {
let key: Key
var value: Element
var prev: Node<Key, Element>?
var next: Node<Key, Element>?
init(key: Key, value: Element) {
self.key = key
self.value = value
}
func hash(into hasher: inout Hasher) {
hasher.combine(key)
}
}
```moveToHead(node) // cannot convert value of type 'Element' to expected argument type 'Node<Key, Element>'return node.value // value of type 'Element' has no member 'value'remove(node) // cannot convert value of type 'Element' to expected argument type 'Node<Key, Element>'node.value = newValue // value of type 'Element' has no member 'value'moveToHead(node) // cannot convert value of type 'Element' to expected argument type 'Node<Key, Element>'cache[key] = node // cannot assign value of type 'Node<Key, Element>' to subscript of type 'Element'private class Node<Key: Hashable, Element>: Hashable { // type 'Node<Key, Element>' does not conform to protocol 'Equatable'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var head: Node<Key, Element>?
private var tail: Node<Key, Element>?
private var count: Int
private var capacity: Int
private var lock: NSLock
init(capacity: Int) {
self.capacity = capacity
self.count = 0
self.cache = [:]
self.head = nil
self.tail = nil
self.lock = NSLock()
}
subscript(key: Key) -> Element? {
get {
lock.lock()
defer { lock.unlock() }
return cache[key]
}
set {
lock.lock()
defer { lock.unlock() }
if let value = newValue {
if let node = cache[key] {
node.value = value
moveToHead(node)
} else {
let node = Node(key: key, value: value)
cache[key] = node
addToHead(node)
count += 1
if count > capacity {
removeTail()
count -= 1
}
}
} else {
cache[key] = nil
}
}
}
private func addToHead(_ node: Node<Key, Element>) {
if let head = head {
node.next = head
head.previous = node
} else {
tail = node
}
head = node
}
private func moveToHead(_ node: Node<Key, Element>) {
if node === head {
return
}
if let previous = node.previous {
previous.next = node.next
} else {
tail = node.next
}
if let next = node.next {
next.previous = node.previous
}
addToHead(node)
}
private func removeTail() {
guard let tail = tail else { return }
guard let previous = tail.previous else {
head = nil
return
}
previous.next = nil
tail = previous
}
}
private class Node<Key: Hashable, Element>: Hashable {
let key: Key
var value: Element
var previous: Node<Key, Element>?
var next: Node<Key, Element>?
init(key: Key, value: Element) {
self.key = key
self.value = value
}
func hash(into hasher: inout Hasher) {
hasher.combine(key)
}
static func == (lhs: Node<Key, Element>, rhs: Node<Key, Element>) -> Bool {
return lhs.key == rhs.key
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var head: Node<Key, Element>?
private var tail: Node<Key, Element>?
private var count: Int
private var capacity: Int
private var lock: NSLock
init(capacity: Int) {
self.capacity = capacity
self.count = 0
self.cache = [:]
self.head = nil
self.tail = nil
self.lock = NSLock()
}
subscript(key: Key) -> Element? {
get {
lock.lock()
defer { lock.unlock() }
return cache[key]
}
set {
lock.lock()
defer { lock.unlock() }
if let value = newValue {
if let node = cache[key] {
node.value = value
moveToHead(node)
} else {
let node = Node(key: key, value: value)
cache[key] = node
addToHead(node)
count += 1
if count > capacity {
removeTail()
count -= 1
}
}
} else {
cache[key] = nil
}
}
}
private func addToHead(_ node: Node<Key, Element>) {
if let head = head {
node.next = head
head.previous = node
} else {
tail = node
}
head = node
}
private func moveToHead(_ node: Node<Key, Element>) {
if node === head {
return
}
if let previous = node.previous {
previous.next = node.next
} else {
tail = node.next
}
if let next = node.next {
next.previous = node.previous
}
addToHead(node)
}
private func removeTail() {
guard let tail = tail else { return }
guard let previous = tail.previous else {
head = nil
return
}
previous.next = nil
tail = previous
}
}
private class Node<Key: Hashable, Element>: Hashable {
let key: Key
var value: Element
var previous: Node<Key, Element>?
var next: Node<Key, Element>?
init(key: Key, value: Element) {
self.key = key
self.value = value
}
func hash(into hasher: inout Hasher) {
hasher.combine(key)
}
static func == (lhs: Node<Key, Element>, rhs: Node<Key, Element>) -> Bool {
return lhs.key == rhs.key
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'node.value = value // value of type 'Element' has no member 'value'moveToHead(node) // cannot convert value of type 'Element' to expected argument type 'Node<Key, Element>'cache[key] = node // cannot assign value of type 'Node<Key, Element>' to subscript of type 'Element'tail = previous // cannot assign to value: 'tail' is a 'let' constantprotocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var lastUsed: [Key: Date] = [:]
private let capacity: Int
private let queue = DispatchQueue(label: "com.example.cache", qos: .utility, attributes: .concurrent)
required init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let newValue = newValue {
cache[key] = newValue
lastUsed[key] = Date()
} else {
cache.removeValue(forKey: key)
lastUsed.removeValue(forKey: key)
}
}
}
func remove(key: Key) {
queue.sync {
cache.removeValue(forKey: key)
lastUsed.removeValue(forKey: key)
}
}
func removeAll() {
queue.sync {
cache.removeAll()
lastUsed.removeAll()
}
}
func removeLRU() {
queue.sync {
let lruKey = lastUsed.min(by: { $0.value < $1.value })?.key
cache.removeValue(forKey: lruKey)
lastUsed.removeValue(forKey: lruKey)
}
}
func removeLRU(count: Int) {
queue.sync {
for _ in 0..<count {
let lruKey = lastUsed.min(by: { $0.value < $1.value })?.key
cache.removeValue(forKey: lruKey)
lastUsed.removeValue(forKey: lruKey)
}
}
}
func removeLRU(percentage: Double) {
queue.sync {
let count = Int(Double(capacity) * percentage)
removeLRU(count: count)
}
}
func removeLRU(percentage: Double, count: Int) {
queue.sync {
let count = Int(Double(capacity) * percentage) + count
removeLRU(count: count)
}
}
func removeLRU(count: Int, percentage: Double) {
queue.sync {
let count = Int(Double(capacity) * percentage) + count
removeLRU(count: count)
}
}
func removeLRU(count: Int, percentage: Double, count2: Int) {
queue.sync {
let count = Int(Double(capacity) * percentage) + count
removeLRU(count: count + count2)
}
}
func removeLRU(percentage: Double, count: Int, percentage2: Double) {
queue.sync {
let count = Int(Double(capacity) * percentage) + count
removeLRU(count: count + Int(Double(capacity) * percentage2))
}
}
func removeLRU(percentage: Double, percentage2: Double) {
queue.sync {
let count = Int(Double(capacity) * percentage)
removeLRU(count: count + Int(Double(capacity) * percentage2))
}
}
func removeLRU(percentage: Double, percentage2: Double, count: Int) {
queue.sync {
let count = Int(Double(capacity) * percentage) + count
removeLRU(count: count + Int(Double(capacity) * percentage2))
}
}
func removeLRU(percentage: Double, percentage2: Double, count: Int, percentage3: Double) {
queue.sync {
let count = Int(Double(capacity) * percentage) + count
removeLRU(count: count + Int(Double(capacity) * percentage2) + Int(Double(capacity) * percentage3))
}
}
func removeLRU(percentage: Double, percentage2let cache = Cache<String, Int>(capacity: 2) // cannot find 'Cache' in scopeprotocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var lastAccessed: [Key: Date]
private let capacity: Int
private let clock: () -> Date
init(capacity: Int, clock: @escaping () -> Date) {
self.capacity = capacity
self.clock = clock
self.cache = [:]
self.lastAccessed = [:]
}
subscript(key: Key) -> Element? {
get {
guard let value = cache[key] else { return nil }
updateLastAccessed(key)
return value
}
set {
guard let newValue = newValue else { return }
cache[key] = newValue
updateLastAccessed(key)
if cache.count > capacity {
removeOldest()
}
}
}
private func updateLastAccessed(_ key: Key) {
lastAccessed[key] = clock()
}
private func removeOldest() {
guard let key = lastAccessed.min(by: { $0.1 < $1.1 })?.key else { return }
cache.removeValue(forKey: key)
lastAccessed.removeValue(forKey: key)
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var lastAccessed: [Key: Date]
private let capacity: Int
private let clock: () -> Date
init(capacity: Int, clock: @escaping () -> Date) {
self.capacity = capacity
self.clock = clock
self.cache = [:]
self.lastAccessed = [:]
}
subscript(key: Key) -> Element? {
get {
guard let value = cache[key] else { return nil }
updateLastAccessed(key)
return value
}
set {
guard let newValue = newValue else { return }
cache[key] = newValue
updateLastAccessed(key)
if cache.count > capacity {
removeOldest()
}
}
}
private func updateLastAccessed(_ key: Key) {
lastAccessed[key] = clock()
}
private func removeOldest() {
guard let key = lastAccessed.min(by: { $0.1 < $1.1 })?.key else { return }
cache.removeValue(forKey: key)
lastAccessed.removeValue(forKey: key)
}
}
// A cache that stores a maximum of 1000 items, and evicts the least recently used item when the cache is full.
let cache = Cache<String, Int>(capacity: 1000) { Date() }
// Add 1000 items to the cache
for i in 0..<1000 {
cache[String(i)] = i
}
// The cache is full, so the least recently used item is evicted
cache["1000"] = 1000
// The cache is still full, so the least recently used item is evicted again
cache["1001"] = 1001
// The cache is still full, so the least recently used item is evicted again
cache["1002"] = 1002
// The cache is still full, so the least recently used item is evicted again
cache["1003"] = 1003
// The cache is still full, so the least recently used item is evicted again
cache["1004"] = 1004
// The cache is still full, so the least recently used item is evicted again
cache["1005"] = 1005
// The cache is still full, so the least recently used item is evicted again
cache["1006"] = 1006
// The cache is still full, so the least recently used item is evicted again
cache["1007"] = 1007
// The cache is still full, so the least recently used item is evicted again
cache["1008"] = 1008
// The cache is still full, so the least recently used item is evicted again
cache["1009"] = 1009
// The cache is still full, so the least recently used item is evicted again
cache["1010"] = 1010
// The cache is still full, so the least recently used item is evicted again
cache["1011"] = 1011
// The cache is still full, so the least recently used item is evicted again
cache["1012"] = 1012
// The cache is still full, so the least recently used item is evicted again
cache["1013"] = 1013
// The cache is still full, so the least recently used item is evicted again
cache["1014"] = 1014
// The cache is still full, so the least recently used item is evicted again
cache["1015"] = 1015
// The cache is still full, so the least recently used item is evicted again
cache["1016"] = 1016
// The cache is still full, so the least recently used item is evicted again
cache["1017"] = 1017
// The cache is still full, so the least recently used item is evicted again
cache["10class Cache<Key: Hashable, Element>: CacheProtocol { // type 'Cache<Key, Element>' does not conform to protocol 'CacheProtocol'let cache = Cache<String, Int>(capacity: 2) // missing argument for parameter 'clock' in callprotocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache = [Key: Element]()
private var head: CacheNode<Key, Element>?
private var tail: CacheNode<Key, Element>?
private var count = 0
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let newValue = newValue {
if let node = cache[key] {
node.value = newValue
moveToHead(node)
} else {
let node = CacheNode(key: key, value: newValue)
cache[key] = node
addToHead(node)
count += 1
if count > capacity {
removeTail()
}
}
} else {
cache[key] = nil
}
}
}
private func addToHead(_ node: CacheNode<Key, Element>) {
node.next = head
head?.previous = node
head = node
if tail == nil {
tail = head
}
}
private func moveToHead(_ node: CacheNode<Key, Element>) {
if node === head {
return
}
node.previous?.next = node.next
node.next?.previous = node.previous
addToHead(node)
}
private func removeTail() {
guard let tail = tail else { return }
cache.removeValue(forKey: tail.key)
tail.previous?.next = nil
tail.next?.previous = nil
tail = tail.previous
if tail == nil {
head = nil
}
count -= 1
}
}
private class CacheNode<Key: Hashable, Element>: Hashable {
let key: Key
var value: Element
var previous: CacheNode<Key, Element>?
var next: CacheNode<Key, Element>?
init(key: Key, value: Element) {
self.key = key
self.value = value
}
func hash(into hasher: inout Hasher) {
hasher.combine(key)
}
static func == (lhs: CacheNode<Key, Element>, rhs: CacheNode<Key, Element>) -> Bool {
return lhs.key == rhs.key
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache = [Key: Element]()
private var head: CacheNode<Key, Element>?
private var tail: CacheNode<Key, Element>?
private var count = 0
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let newValue = newValue {
if let node = cache[key] {
node.value = newValue
moveToHead(node)
} else {
let node = CacheNode(key: key, value: newValue)
cache[key] = node
addToHead(node)
count += 1
if count > capacity {
removeTail()
}
}
} else {
cache[key] = nil
}
}
}
private func addToHead(_ node: CacheNode<Key, Element>) {
node.next = head
head?.previous = node
head = node
if tail == nil {
tail = head
}
}
private func moveToHead(_ node: CacheNode<Key, Element>) {
if node === head {
return
}
node.previous?.next = node.next
node.next?.previous = node.previous
addToHead(node)
}
private func removeTail() {
guard let tail = tail else { return }
cache.removeValue(forKey: tail.key)
tail.previous?.next = nil
tail.next?.previous = nil
tail = tail.previous
if tail == nil {
head = nil
}
count -= 1
}
}
private class CacheNode<Key: Hashable, Element>: Hashable {
let key: Key
var value: Element
var previous: CacheNode<Key, Element>?
var next: CacheNode<Key, Element>?
init(key: Key, value: Element) {
self.key = key
self.value = value
}
func hash(into hasher: inout Hasher) {
hasher.combine(key)
}
static func == (lhs: CacheNode<Key, Element>, rhs: CacheNode<Key, Element>) -> Bool {
return lhs.key == rhs.key
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'node.value = newValue // value of type 'Element' has no member 'value'moveToHead(node) // cannot convert value of type 'Element' to expected argument type 'CacheNode<Key, Element>'cache[key] = node // cannot assign value of type 'CacheNode<Key, Element>' to subscript of type 'Element'tail = tail.previous // cannot assign to value: 'tail' is a 'let' constanttail = tail.previous // value of optional type 'CacheNode<Key, Element>?' must be unwrapped to a value of type 'CacheNode<Key, Element>'if tail == nil { // comparing non-optional value of type 'CacheNode<Key, Element>' to 'nil' always returns falseprotocol 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 head: CacheNode<Key, Element>?
private var tail: CacheNode<Key, Element>?
private var count: Int
private var lock = NSLock()
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.count = 0
}
subscript(key: Key) -> Element? {
get {
lock.lock()
defer { lock.unlock() }
return cache[key]
}
set {
lock.lock()
defer { lock.unlock() }
if let newValue = newValue {
if let node = cache[key] {
node.value = newValue
moveToHead(node)
} else {
let node = CacheNode(key: key, value: newValue)
cache[key] = node
addToHead(node)
count += 1
if count > capacity {
removeTail()
}
}
} else {
cache[key] = nil
}
}
}
private func addToHead(_ node: CacheNode<Key, Element>) {
node.next = head
head = node
if tail == nil {
tail = node
}
}
private func moveToHead(_ node: CacheNode<Key, Element>) {
if head === node {
return
}
node.next = nil
head?.next = node
head = node
if tail === node {
tail = head
}
}
private func removeTail() {
guard let node = tail else { return }
tail = node.previous
tail?.next = nil
cache.removeValue(forKey: node.key)
count -= 1
}
}
private class CacheNode<Key: Hashable, Element>: Hashable {
let key: Key
var value: Element
var previous: CacheNode<Key, Element>?
var next: CacheNode<Key, Element>?
init(key: Key, value: Element) {
self.key = key
self.value = value
}
func hash(into hasher: inout Hasher) {
hasher.combine(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 head: CacheNode<Key, Element>?
private var tail: CacheNode<Key, Element>?
private var count: Int
private var lock = NSLock()
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.count = 0
}
subscript(key: Key) -> Element? {
get {
lock.lock()
defer { lock.unlock() }
return cache[key]
}
set {
lock.lock()
defer { lock.unlock() }
if let newValue = newValue {
if let node = cache[key] {
node.value = newValue
moveToHead(node)
} else {
let node = CacheNode(key: key, value: newValue)
cache[key] = node
addToHead(node)
count += 1
if count > capacity {
removeTail()
}
}
} else {
cache[key] = nil
}
}
}
private func addToHead(_ node: CacheNode<Key, Element>) {
node.next = head
head = node
if tail == nil {
tail = node
}
}
private func moveToHead(_ node: CacheNode<Key, Element>) {
if head === node {
return
}
node.next = nil
head?.next = node
head = node
if tail === node {
tail = head
}
}
private func removeTail() {
guard let node = tail else { return }
tail = node.previous
tail?.next = nil
cache.removeValue(forKey: node.key)
count -= 1
}
}
private class CacheNode<Key: Hashable, Element>: Hashable {
let key: Key
var value: Element
var previous: CacheNode<Key, Element>?
var next: CacheNode<Key, Element>?
init(key: Key, value: Element) {
self.key = key
self.value = value
}
func hash(into hasher: inout Hasher) {
hasher.combine(key)
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'node.value = newValue // value of type 'Element' has no member 'value'moveToHead(node) // cannot convert value of type 'Element' to expected argument type 'CacheNode<Key, Element>'cache[key] = node // cannot assign value of type 'CacheNode<Key, Element>' to subscript of type 'Element'private class CacheNode<Key: Hashable, Element>: Hashable { // type 'CacheNode<Key, Element>' does not conform to protocol 'Equatable'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var order: [Key] = []
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
order.removeAll(where: { $0 == key })
order.append(key)
return value
}
return nil
}
set {
if let newValue = newValue {
if let value = cache[key] {
order.removeAll(where: { $0 == key })
} else {
if cache.count == capacity {
let keyToRemove = order.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
}
cache[key] = newValue
order.append(key)
} else {
cache.removeValue(forKey: key)
order.removeAll(where: { $0 == key })
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var order: [Key] = []
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
order.removeAll(where: { $0 == key })
order.append(key)
return value
}
return nil
}
set {
if let newValue = newValue {
if let value = cache[key] {
order.removeAll(where: { $0 == key })
} else {
if cache.count == capacity {
let keyToRemove = order.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
}
cache[key] = newValue
order.append(key)
} else {
cache.removeValue(forKey: key)
order.removeAll(where: { $0 == key })
}
}
}
}
// MARK: - Tests
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"] = 5
cache["a"]
cache["b"]
cache["c"]
cache["d"]
cache["e"]
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'if let value = cache[key] { // value 'value' was defined but never used; consider replacing with boolean testprotocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var order: [Key] = []
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let newValue = newValue {
if let oldValue = cache[key] {
order.removeAll(where: { $0 == key })
}
cache[key] = newValue
order.append(key)
if order.count > capacity {
let keyToRemove = order.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var order: [Key] = []
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let newValue = newValue {
if let oldValue = cache[key] {
order.removeAll(where: { $0 == key })
}
cache[key] = newValue
order.append(key)
if order.count > capacity {
let keyToRemove = order.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
} else {
cache.removeValue(forKey: key)
}
}
}
}
// MARK: - Tests
var cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"] = 5
cache["f"] = 6
cache["g"] = 7
cache["h"] = 8
cache["i"] = 9
cache["j"] = 10
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"] = 5
cache["f"] = 6
cache["g"] = 7
cache["h"] = 8
cache["i"] = 9
cache["j"] = 10
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"] = 5
cache["f"] = 6
cache["g"] = 7
cache["h"] = 8
cache["i"] = 9
cache["j"] = 10
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"] = 5
cache["f"] = 6
cache["g"] = 7
cache["h"] = 8
cache["i"] = 9
cache["j"] = 10
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"] = 5
cache["f"] = 6
cache["g"] = 7
cache["h"] = 8
cache["i"] = 9
cache["j"] = 10
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"] = 5
cache["f"] = 6
cache["g"] = 7
cache["h"] = 8
cache["i"] = 9
cache["j"] = 10
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"] = 5
cache["f"] = 6
cache["g"] = 7
cache["h"] = 8
cache["i"] = 9
cache["j"] = 10
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"] = 5
cache["f"] = 6
cache["g"] = 7
cache["h"] = 8
cache["i"] = 9
cache["j"] = 10
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"] = 5
cache["f"] = 6
cache["g"] = 7
cache["h"] = 8
cache["i"] = 9
cache["j"] = 10
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"]init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'if let oldValue = cache[key] { // value 'oldValue' was defined but never used; consider replacing with boolean testprotocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var lastUsed: [Key: Date] = [:]
private let capacity: Int
private let queue = DispatchQueue(label: "com.example.cache", attributes: .concurrent)
required init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
queue.sync {
lastUsed[key] = Date()
}
return cache[key]
}
set {
queue.sync {
if let newValue = newValue {
cache[key] = newValue
lastUsed[key] = Date()
} else {
cache[key] = nil
lastUsed[key] = nil
}
if cache.count > capacity {
let sortedKeys = lastUsed.keys.sorted(by: { lastUsed[$0]! < lastUsed[$1]! })
for key in sortedKeys.prefix(upTo: capacity / 2) {
cache.removeValue(forKey: key)
lastUsed.removeValue(forKey: key)
}
}
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var lastUsed: [Key: Date] = [:]
private let capacity: Int
private let queue = DispatchQueue(label: "com.example.cache", attributes: .concurrent)
required init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
queue.sync {
lastUsed[key] = Date()
}
return cache[key]
}
set {
queue.sync {
if let newValue = newValue {
cache[key] = newValue
lastUsed[key] = Date()
} else {
cache[key] = nil
lastUsed[key] = nil
}
if cache.count > capacity {
let sortedKeys = lastUsed.keys.sorted(by: { lastUsed[$0]! < lastUsed[$1]! })
for key in sortedKeys.prefix(upTo: capacity / 2) {
cache.removeValue(forKey: key)
lastUsed.removeValue(forKey: key)
}
}
}
}
}
}
```protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var lastAccessed: [Key: Date]
private let capacity: Int
required init(capacity: Int) {
self.capacity = capacity
cache = [:]
lastAccessed = [:]
}
subscript(key: Key) -> Element? {
get {
guard let value = cache[key] else { return nil }
updateLastAccessed(key)
return value
}
set {
if let newValue = newValue {
cache[key] = newValue
updateLastAccessed(key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache[key] = nil
}
}
}
private func updateLastAccessed(_ key: Key) {
lastAccessed[key] = Date()
}
private func removeLeastRecentlyUsed() {
guard let leastRecentlyUsedKey = leastRecentlyUsed() else { return }
cache.removeValue(forKey: leastRecentlyUsedKey)
lastAccessed.removeValue(forKey: leastRecentlyUsedKey)
}
private func leastRecentlyUsed() -> Key? {
guard !lastAccessed.isEmpty else { return nil }
return lastAccessed.min(by: { $0.value < $1.value })?.key
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var lastAccessed: [Key: Date]
private let capacity: Int
required init(capacity: Int) {
self.capacity = capacity
cache = [:]
lastAccessed = [:]
}
subscript(key: Key) -> Element? {
get {
guard let value = cache[key] else { return nil }
updateLastAccessed(key)
return value
}
set {
if let newValue = newValue {
cache[key] = newValue
updateLastAccessed(key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache[key] = nil
}
}
}
private func updateLastAccessed(_ key: Key) {
lastAccessed[key] = Date()
}
private func removeLeastRecentlyUsed() {
guard let leastRecentlyUsedKey = leastRecentlyUsed() else { return }
cache.removeValue(forKey: leastRecentlyUsedKey)
lastAccessed.removeValue(forKey: leastRecentlyUsedKey)
}
private func leastRecentlyUsed() -> Key? {
guard !lastAccessed.isEmpty else { return nil }
return lastAccessed.min(by: { $0.value < $1.value })?.key
}
}
```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: Value, expiration: Date)] = [:]
private let queue = DispatchQueue(label: "ExpirableCache")
private let expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue!, key: key, expiration: expiration)
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, Date().addingTimeInterval(expiration))
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > Date() {
return value
}
cache.removeValue(forKey: key)
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: Value, expiration: Date)] = [:]
private let queue = DispatchQueue(label: "ExpirableCache")
private let expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue!, key: key, expiration: expiration)
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, Date().addingTimeInterval(expiration))
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > Date() {
return value
}
cache.removeValue(forKey: key)
return 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: Value, expiration: Date)] = [:]
private let queue = DispatchQueue(label: "ExpirableCache")
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, Date().addingTimeInterval(expiration))
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > Date() {
return value
}
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: 60)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
private let queue = DispatchQueue(label: "ExpirableCache")
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, Date().addingTimeInterval(expiration))
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > Date() {
return value
}
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: 60)
}
}
}
}
```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: Value, expiration: TimeInterval)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
if expiration > Date.timeIntervalSinceReferenceDate {
return value
}
cache.removeValue(forKey: key)
return nil
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set { 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: Value, expiration: TimeInterval)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
if expiration > Date.timeIntervalSinceReferenceDate {
return value
}
cache.removeValue(forKey: key)
return nil
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set { put(value: newValue!, key: key, expiration: 10) }
}
}
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertEqual failed: (nil) is not equal to (Optional("Hello, SwiftEval!"))protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], expiration > Date() else {
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 60)
} else {
cache[key] = nil
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], expiration > Date() else {
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 60)
} else {
cache[key] = nil
}
}
}
}
// Testing
let cache = ExpirableCache<String, String>()
cache["foo"] = "bar"
cache["foo"] = nil
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: Value, expiration: Date)] = [:]
private let queue = DispatchQueue(label: "ExpirableCache")
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, Date().addingTimeInterval(expiration))
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else { return nil }
if expiration < Date() {
cache.removeValue(forKey: key)
return nil
}
return value
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
private let queue = DispatchQueue(label: "ExpirableCache")
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, Date().addingTimeInterval(expiration))
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else { return nil }
if expiration < Date() {
cache.removeValue(forKey: key)
return nil
}
return value
}
}
}
```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: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 3600)
} 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: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 3600)
} else {
cache.removeValue(forKey: key)
}
}
}
}
// Testing
let cache = ExpirableCache<String, Int>()
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["a"] = 10
cache["b"] = 20
cache["c"] = 30
cache["a"] = nil
cache["b"] = nil
cache["c"] = nil
cache["a"] = 100
cache["b"] = 200
cache["c"] = 300
print(cache["a"]) // 100
print(cache["b"]) // 200
print(cache["c"]) // 300
```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: Value, expiration: Date)] = [:]
private let lock = NSLock()
func put(value: Value, key: Key, expiration: TimeInterval) {
lock.lock()
defer { lock.unlock() }
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
lock.lock()
defer { lock.unlock() }
guard let (value, expiration) = cache[key] else { return nil }
if expiration < Date() {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 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: Value, expiration: Date)] = [:]
private let lock = NSLock()
func put(value: Value, key: Key, expiration: TimeInterval) {
lock.lock()
defer { lock.unlock() }
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
lock.lock()
defer { lock.unlock() }
guard let (value, expiration) = cache[key] else { return nil }
if expiration < Date() {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 10)
} else {
cache.removeValue(forKey: key)
}
}
}
}
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], expiration > Date() else {
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 10)
} else {
cache[key] = nil
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], expiration > Date() else {
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 10)
} else {
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: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], expiration > Date() else {
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 3600)
} else {
cache[key] = nil
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, Date().addingTimeInterval(expiration))
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], expiration > Date() else {
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 3600)
} else {
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: Value, expiration: Date)] = [:]
private let queue = DispatchQueue(label: "ExpirableCache")
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, Date().addingTimeInterval(expiration))
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue!, key: key, expiration: 60)
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
private let queue = DispatchQueue(label: "ExpirableCache")
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, Date().addingTimeInterval(expiration))
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > Date() {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue!, key: key, expiration: 60)
}
}
}
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
let encryptedData = data.enumerated().map { (i, byte) -> UInt8 in
return byte ^ keyData[i % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = data.enumerated().map { (i, byte) -> UInt8 in
return byte ^ keyData[i % keyData.count]
}
return String(bytes: decryptedData, encoding: .utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
let encryptedData = data.enumerated().map { (i, byte) -> UInt8 in
return byte ^ keyData[i % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = data.enumerated().map { (i, byte) -> UInt8 in
return byte ^ keyData[i % keyData.count]
}
return String(bytes: decryptedData, encoding: .utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
var encryptedData = Data()
for i in 0..<data.count {
encryptedData.append(data[i] ^ keyData[i % keyData.count])
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data()
for i in 0..<data.count {
decryptedData.append(data[i] ^ keyData[i % 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 = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
var encryptedData = Data()
for i in 0..<data.count {
encryptedData.append(data[i] ^ keyData[i % keyData.count])
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data()
for i in 0..<data.count {
decryptedData.append(data[i] ^ keyData[i % keyData.count])
}
return String(data: decryptedData, encoding: .utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
let encryptedData = data.enumerated().map { (index, byte) -> UInt8 in
return byte ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = data.enumerated().map { (index, byte) -> UInt8 in
return byte ^ keyData[index % keyData.count]
}
return String(bytes: decryptedData, encoding: .utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
let encryptedData = data.enumerated().map { (index, byte) -> UInt8 in
return byte ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = data.enumerated().map { (index, byte) -> UInt8 in
return byte ^ keyData[index % keyData.count]
}
return String(bytes: decryptedData, encoding: .utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
let encryptedData = data.enumerated().map { (i, byte) -> UInt8 in
return byte ^ keyData[i % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = data.enumerated().map { (i, byte) -> UInt8 in
return byte ^ keyData[i % keyData.count]
}
return String(bytes: decryptedData, encoding: .utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
let encryptedData = data.enumerated().map { (i, byte) -> UInt8 in
return byte ^ keyData[i % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = data.enumerated().map { (i, byte) -> UInt8 in
return byte ^ keyData[i % keyData.count]
}
return String(bytes: decryptedData, encoding: .utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
var encryptedData = Data()
for i in 0..<data.count {
encryptedData.append(data[i] ^ keyData[i % keyData.count])
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data()
for i in 0..<data.count {
decryptedData.append(data[i] ^ keyData[i % 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 = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
var encryptedData = Data()
for i in 0..<data.count {
encryptedData.append(data[i] ^ keyData[i % keyData.count])
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data()
for i in 0..<data.count {
decryptedData.append(data[i] ^ keyData[i % keyData.count])
}
return String(data: decryptedData, encoding: .utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
var encrypted = Data()
for (i, _) in data.enumerated() {
let x = Int(data[i]) ^ Int(keyData[i % keyData.count])
encrypted.append(UInt8(x))
}
return encrypted
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decrypted = Data()
for (i, _) in data.enumerated() {
let x = Int(data[i]) ^ Int(keyData[i % keyData.count])
decrypted.append(UInt8(x))
}
return String(data: decrypted, 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)!
var encrypted = Data()
for (i, _) in data.enumerated() {
let x = Int(data[i]) ^ Int(keyData[i % keyData.count])
encrypted.append(UInt8(x))
}
return encrypted
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decrypted = Data()
for (i, _) in data.enumerated() {
let x = Int(data[i]) ^ Int(keyData[i % keyData.count])
decrypted.append(UInt8(x))
}
return String(data: decrypted, encoding: .utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
var encryptedData = Data()
for i in 0..<data.count {
let byte = data[i] ^ keyData[i % keyData.count]
encryptedData.append(byte)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data()
for i in 0..<data.count {
let byte = data[i] ^ keyData[i % keyData.count]
decryptedData.append(byte)
}
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)!
var encryptedData = Data()
for i in 0..<data.count {
let byte = data[i] ^ keyData[i % keyData.count]
encryptedData.append(byte)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data()
for i in 0..<data.count {
let byte = data[i] ^ keyData[i % keyData.count]
decryptedData.append(byte)
}
return String(data: decryptedData, encoding: .utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
var encryptedData = Data(count: data.count)
for i in 0..<data.count {
encryptedData[i] = data[i] ^ keyData[i % keyData.count]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data(count: data.count)
for i in 0..<data.count {
decryptedData[i] = data[i] ^ keyData[i % 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 = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
var encryptedData = Data(count: data.count)
for i in 0..<data.count {
encryptedData[i] = data[i] ^ keyData[i % keyData.count]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data(count: data.count)
for i in 0..<data.count {
decryptedData[i] = data[i] ^ keyData[i % keyData.count]
}
return String(data: decryptedData, encoding: .utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
let key = Array(repeating: 0, count: keyData.count)
for i in 0..<keyData.count {
key[i] = UInt8(keyData[i])
}
let encrypted = data.enumerated().map { (i, byte) -> UInt8 in
return byte ^ key[i % key.count]
}
return Data(encrypted)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let key = Array(repeating: 0, count: keyData.count)
for i in 0..<keyData.count {
key[i] = UInt8(keyData[i])
}
let decrypted = data.enumerated().map { (i, byte) -> UInt8 in
return byte ^ key[i % key.count]
}
return String(bytes: decrypted, 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 key = Array(repeating: 0, count: keyData.count)
for i in 0..<keyData.count {
key[i] = UInt8(keyData[i])
}
let encrypted = data.enumerated().map { (i, byte) -> UInt8 in
return byte ^ key[i % key.count]
}
return Data(encrypted)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let key = Array(repeating: 0, count: keyData.count)
for i in 0..<keyData.count {
key[i] = UInt8(keyData[i])
}
let decrypted = data.enumerated().map { (i, byte) -> UInt8 in
return byte ^ key[i % key.count]
}
return String(bytes: decrypted, encoding: .utf8)!
}
}
```key[i] = UInt8(keyData[i]) // cannot assign value of type 'UInt8' to subscript of type 'Int'key[i] = UInt8(keyData[i]) // cannot assign through subscript: 'key' is a 'let' constantreturn byte ^ key[i % key.count] // cannot convert value of type 'Int' to expected argument type 'UInt8'key[i] = UInt8(keyData[i]) // cannot assign through subscript: 'key' is a 'let' constantkey[i] = UInt8(keyData[i]) // cannot assign value of type 'UInt8' to subscript of type 'Int'return byte ^ key[i % key.count] // cannot convert value of type 'Int' to expected argument type 'UInt8'protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
let result = data.enumerated().map { (i, d) -> UInt8 in
return d ^ keyData[i % keyData.count]
}
return Data(result)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let result = data.enumerated().map { (i, d) -> UInt8 in
return d ^ keyData[i % keyData.count]
}
return String(bytes: result, 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 result = data.enumerated().map { (i, d) -> UInt8 in
return d ^ keyData[i % keyData.count]
}
return Data(result)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let result = data.enumerated().map { (i, d) -> UInt8 in
return d ^ keyData[i % keyData.count]
}
return String(bytes: result, encoding: .utf8)!
}
}
```protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
while !requests.isEmpty,
now.timeIntervalSince(requests.first!) > timeInterval {
requests.removeFirst()
}
guard requests.count < maxRequests else { return false }
requests.append(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 {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
while !requests.isEmpty,
now.timeIntervalSince(requests.first!) > timeInterval {
requests.removeFirst()
}
guard requests.count < maxRequests else { return false }
requests.append(now)
return true
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
while !requests.isEmpty, now.timeIntervalSince(requests[0]) > timeInterval {
requests.removeFirst()
}
if requests.count < maxRequests {
requests.append(now)
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
while !requests.isEmpty, now.timeIntervalSince(requests[0]) > timeInterval {
requests.removeFirst()
}
if requests.count < maxRequests {
requests.append(now)
return true
}
return false
}
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
while !requests.isEmpty, now.timeIntervalSince(requests[0]) > timeInterval {
requests.removeFirst()
}
if requests.count < maxRequests {
requests.append(now)
return true
}
return false
}
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
while !requests.isEmpty, now.timeIntervalSince(requests[0]) > timeInterval {
requests.removeFirst()
}
if requests.count < maxRequests {
requests.append(now)
return true
}
return false
}
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
while !requests.isEmpty, now.timeIntervalSince(requests[0]) > timeInterval {
requests.removeFirst()
}
if requests.count < maxRequests {
requests.append(now)
return true
}
return false
}
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
while !requests.isEmpty, now.timeIntervalSince(requests[0]) > timeInterval {
requests.removeFirst()
}
if requests.count < maxRequests {
requests.append(now)
return true
}
return false
}init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { $0 < now }
requests = Array(Set(requests).subtracting(expiredRequests))
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 var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { $0 < now }
requests = Array(Set(requests).subtracting(expiredRequests))
return requests.count < maxRequests
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { $0 < now }
requests = Array(Set(requests).subtracting(expiredRequests))
if requests.count < maxRequests {
requests.append(now.addingTimeInterval(timeInterval))
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { $0 < now }
requests = Array(Set(requests).subtracting(expiredRequests))
if requests.count < maxRequests {
requests.append(now.addingTimeInterval(timeInterval))
return true
}
return false
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private 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 {
guard requests.count < maxRequests else { return false }
let now = Date()
while !requests.isEmpty, now.timeIntervalSince(requests.first!) > timeInterval {
requests.removeFirst()
}
requests.append(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 {
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 {
guard requests.count < maxRequests else { return false }
let now = Date()
while !requests.isEmpty, now.timeIntervalSince(requests.first!) > timeInterval {
requests.removeFirst()
}
requests.append(now)
return true
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { $0 < now }
requests = Array(Set(requests).subtracting(expiredRequests))
if requests.count < maxRequests {
requests.append(now.addingTimeInterval(timeInterval))
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { $0 < now }
requests = Array(Set(requests).subtracting(expiredRequests))
if requests.count < maxRequests {
requests.append(now.addingTimeInterval(timeInterval))
return true
}
return false
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
while !requests.isEmpty,
now.timeIntervalSince(requests[0]) > timeInterval {
requests.removeFirst()
}
guard requests.count < maxRequests else {
return false
}
requests.append(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 {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
while !requests.isEmpty,
now.timeIntervalSince(requests[0]) > timeInterval {
requests.removeFirst()
}
guard requests.count < maxRequests else {
return false
}
requests.append(now)
return true
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { $0 < now }
requests = Array(Set(requests).subtracting(expiredRequests))
if requests.count < maxRequests {
requests.append(now.addingTimeInterval(timeInterval))
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { $0 < now }
requests = Array(Set(requests).subtracting(expiredRequests))
if requests.count < maxRequests {
requests.append(now.addingTimeInterval(timeInterval))
return true
}
return false
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { $0 < now }
requests = Array(Set(requests).subtracting(expiredRequests))
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 var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { $0 < now }
requests = Array(Set(requests).subtracting(expiredRequests))
return requests.count < maxRequests
}
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let expiredRequests = requests.filter { $0 < now }
requests = Array(Set(requests).subtracting(expiredRequests))
return requests.count < maxRequests
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
while !requests.isEmpty, now.timeIntervalSince(requests[0]) > timeInterval {
requests.removeFirst()
}
if requests.count < maxRequests {
requests.append(now)
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requests: [Date] = []
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
while !requests.isEmpty, now.timeIntervalSince(requests[0]) > timeInterval {
requests.removeFirst()
}
if requests.count < maxRequests {
requests.append(now)
return true
}
return false
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounter", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int
queue.sync {
currentValue = self.value
}
return currentValue
}
}
class ThreadSafeCounterWithReaders: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterWithReaders", attributes: .concurrent)
private let queueForReaders = DispatchQueue(label: "ThreadSafeCounterWithReadersReaders", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int
queue.sync {
currentValue = self.value
}
return currentValue
}
func currentValueWithReaders() -> Int {
var currentValue: Int
queueForReaders.sync {
currentValue = self.value
}
return currentValue
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounter", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int
queue.sync {
currentValue = self.value
}
return currentValue
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithReaders: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterWithReaders", attributes: .concurrent)
private let queueForReaders = DispatchQueue(label: "ThreadSafeCounterWithReadersReaders", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var currentValue: Int
queue.sync {
currentValue = self.value
}
return currentValue
}
func currentValueWithReaders() -> Int {
var currentValue: Int
queueForReaders.sync {
currentValue = self.value
}
return 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 'ThreadSafeCounterWithReaders'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock: NSLock
init(value: Int) {
self.value = value
self.lock = NSLock()
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let result = value
lock.unlock()
return result
}
}
class ThreadSafeCounterWithQueue: ThreadSafeCounterProtocol {
private var value: Int
private let queue: DispatchQueue
init(value: Int) {
self.value = value
self.queue = DispatchQueue(label: "com.example.ThreadSafeCounterWithQueue")
}
func increment() {
queue.async {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = self.value
}
return result
}
}
class ThreadSafeCounterWithAtomic: ThreadSafeCounterProtocol {
private var value: Int
private let queue: DispatchQueue
init(value: Int) {
self.value = value
self.queue = DispatchQueue(label: "com.example.ThreadSafeCounterWithAtomic")
}
func increment() {
queue.async {
OSAtomicIncrement32(&self.value)
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = self.value
}
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
private let lock: NSLock
init(value: Int) {
self.value = value
self.lock = NSLock()
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let result = value
lock.unlock()
return result
}
}
// 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 let queue: DispatchQueue
init(value: Int) {
self.value = value
self.queue = DispatchQueue(label: "com.example.ThreadSafeCounterWithQueue")
}
func increment() {
queue.async {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = self.value
}
return result
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithAtomic: ThreadSafeCounterProtocol {
private var value: Int
private let queue: DispatchQueue
init(value: Int) {
self.value = value
self.queue = DispatchQueue(label: "com.example.ThreadSafeCounterWithAtomic")
}
func increment() {
queue.async {
OSAtomicIncrement32(&self.value)
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = self.value
}
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'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithAtomic'OSAtomicIncrement32(&self.value) // cannot convert value of type 'UnsafeMutablePointer<Int>' to expected argument type 'UnsafeMutablePointer<Int32>'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock: NSLock
init(value: Int) {
self.value = value
self.lock = NSLock()
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let result = value
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
private let lock: NSLock
init(value: Int) {
self.value = value
self.lock = NSLock()
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let result = value
lock.unlock()
return result
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounter", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = self.value
}
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
private let queue = DispatchQueue(label: "ThreadSafeCounter", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = self.value
}
return result
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounter", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = self.value
}
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
private let queue = DispatchQueue(label: "ThreadSafeCounter", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = self.value
}
return result
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let value = self.value
lock.unlock()
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let value = self.value
lock.unlock()
return value
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock: NSLock
init(value: Int) {
self.value = value
self.lock = NSLock()
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let value = self.value
lock.unlock()
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock: NSLock
init(value: Int) {
self.value = value
self.lock = NSLock()
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let value = self.value
lock.unlock()
return value
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock: DispatchSemaphore
init(value: Int) {
self.value = value
self.lock = DispatchSemaphore(value: 1)
}
func increment() {
lock.wait()
value += 1
lock.signal()
}
func currentValue() -> Int {
lock.wait()
let result = value
lock.signal()
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
private let lock: DispatchSemaphore
init(value: Int) {
self.value = value
self.lock = DispatchSemaphore(value: 1)
}
func increment() {
lock.wait()
value += 1
lock.signal()
}
func currentValue() -> Int {
lock.wait()
let result = value
lock.signal()
return result
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock: NSLock
init(value: Int) {
self.value = value
self.lock = NSLock()
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let value = self.value
lock.unlock()
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock: NSLock
init(value: Int) {
self.value = value
self.lock = NSLock()
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let value = self.value
lock.unlock()
return value
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "com.example.ThreadSafeCounter", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
return queue.sync {
return self.value
}
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "com.example.ThreadSafeCounter", attributes: .concurrent)
init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
return queue.sync {
return self.value
}
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
private var transforms: [((Output) -> Output)] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { (result, transform) in
transform(result)
}
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
private var transforms: [((Output) -> Output)] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { (result, transform) in
transform(result)
}
}
}
// Usage
let pipeline = Pipeline(value: 1)
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
let pipeline = Pipeline<U>(value: value) // cannot convert value of type 'T' to expected argument type 'U'transforms.append(transform) // cannot convert value of type '(Pipeline<T>.Output) -> U' (aka '(T) -> U') to expected argument type '(T) -> T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [AnyTransform]
init(value: Output) {
self.value = value
self.transforms = []
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let transform = AnyTransform(transform)
let pipeline = Pipeline<U>(value: value)
pipeline.transforms.append(contentsOf: transforms)
pipeline.transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1.transform($0) }
}
}
protocol TransformProtocol {
associatedtype Input
associatedtype Output
func transform(_ value: Input) -> Output
}
struct AnyTransform: TransformProtocol {
private let transform: (Any) -> Any
init<U>(_ transform: @escaping (U) -> Any) {
self.transform = transform
}
func transform(_ value: Any) -> Any {
return transform(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
private var transforms: [AnyTransform]
init(value: Output) {
self.value = value
self.transforms = []
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let transform = AnyTransform(transform)
let pipeline = Pipeline<U>(value: value)
pipeline.transforms.append(contentsOf: transforms)
pipeline.transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1.transform($0) }
}
}
// Protocol for transforms that can be applied to a value.
protocol TransformProtocol {
associatedtype Input
associatedtype Output
func transform(_ value: Input) -> Output
}
// Transform protocol implementation that allows transforms to be applied to a value.
struct AnyTransform: TransformProtocol {
private let transform: (Any) -> Any
init<U>(_ transform: @escaping (U) -> Any) {
self.transform = transform
}
func transform(_ value: Any) -> Any {
return transform(value)
}
}
// Protocol for transforms that can be applied to a value.
protocol TransformProtocol {
associatedtype Input
associatedtype Output
func transform(_ value: Input) -> Output
}
// Transform protocol implementation that allows transforms to be applied to a value.
struct AnyTransform: TransformProtocol {
private let transform: (Any) -> Any
init<U>(_ transform: @escaping (U) -> Any) {
self.transform = transform
}
func transform(_ value: Any) -> Any {
return transform(value)
}
}
// Protocol for transforms that can be applied to a value.
protocol TransformProtocol {
associatedtype Input
associatedtype Output
func transform(_ value: Input) -> Output
}
// Transform protocol implementation that allows transforms to be applied to a value.
struct AnyTransform: TransformProtocol {
private let transform: (Any) -> Any
init<U>(_ transform: @escaping (U) -> Any) {
self.transform = transform
}
func transform(_ value: Any) -> Any {
return transform(value)
}
}
// Protocol for transforms that can be applied to a value.
protocol TransformProtocol {
associatedtype Input
associatedtype Output
func transform(_ value: Input) -> Output
}
// Transform protocol implementation that allows transforms to be applied to a value.
struct AnyTransform: TransformProtocol {
private let transform: (Any) -> Any
init<U>(_ transform: @escaping (U) -> Any) {
self.transform = transform
}
func transform(_ value: Any) -> Any {
return transform(value)
}
}
// Protocol for transforms that can be applied to a value.
protocol TransformProtocol {
associatedtype Input
associatedtype Output
func transform(_ value: Input) -> Output
}
// Transform protocol implementation that allows transforms to be applied to a value.
struct AnyTransform: TransformProtocol {
private let transform: (Any) -> Any
init<U>(_ transform: @escaping (U) -> Any) {
self.transform = transform
}
func transform(_ value: Any) -> Any {
return transform(value)
}
}
// Protocol for transforms that can be applied to a value.
protocol TransformProtocol {
associatedtype Input
associatedtype Output
func transform(_ value: Input) -> Output
}
// Transform protocol implementation that allows transforms to be applied to a value.
struct AnyTransform: TransformProtocol {
private let transform: (Any) -> Any
init<U>(_ transform: @escaping (U) -> Any) {
self.transform = transform
}
func transform(_ value: Any) -> Any {
return transform(value)
}
}
// Protocolinit(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'let pipeline = Pipeline<U>(value: value) // cannot convert value of type 'Output' to expected argument type 'U'return transforms.reduce(value) { $1.transform($0) } // cannot convert value of type 'Any' to closure result type 'Output'self.transform = transform // cannot assign value of type '(U) -> Any' to type '(Any) -> Any'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 *let pipeline = Pipeline<U>(value: value) // cannot convert value of type 'Output' to expected argument type 'U'transforms.append(transform) // cannot convert value of type '(Output) -> U' to expected argument type '(Output) -> Output'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
private var transforms: [((Output) -> Output)] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
private var transforms: [((Output) -> Output)] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
.pipe { $0 * 2 }
init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<T>'let pipeline = Pipeline<U>(value: value) // cannot convert value of type 'T' to expected argument type 'U'transforms.append(transform) // cannot convert value of type '(Pipeline<T>.Output) -> U' (aka '(T) -> U') to expected argument type '(T) -> T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// Usage
let pipeline = Pipeline(value: 10)
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 * 2 }
.let pipeline = Pipeline<U>(value: value) // cannot convert value of type 'Output' to expected argument type 'U'transforms.append(transform) // cannot convert value of type '(Output) -> U' to expected argument type '(Output) -> Output'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
private var value: T
private var transforms: [(T) -> T] = []
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
pipeline.transforms = transforms + [transform]
return pipeline
}
func execute() -> T {
return transforms.reduce(value) { $1($0) }
}
}
extension Pipeline {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
private var value: T
private var transforms: [(T) -> T] = []
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
pipeline.transforms = transforms + [transform]
return pipeline
}
func execute() -> T {
return transforms.reduce(value) { $1($0) }
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {
self.init(value: transform(value))
}
}
// Convenience initializer for a pipeline with a single transformation.
extension Pipeline where T == U {
convenience init(_ transform: @escaping (T) -> T) {let pipeline = Pipeline<U>(value: value) // cannot convert value of type 'T' to expected argument type 'U'extension Pipeline where T == U { // cannot find type 'U' in scopeprotocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [Any] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { (value, transform) -> Output in
return transform(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
private var transforms: [Any] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { (value, transform) -> Output in
return transform(value)
}
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [Any] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { (value, transform) -> Output in
return transform(value)
}
}
}
```let pipeline = Pipeline<U>(value: value) // cannot convert value of type 'Output' to expected argument type 'U'return transforms.reduce(value) { (value, transform) -> Output in // cannot convert return expression of type '(_, _) -> Output' to return type 'Output'return transforms.reduce(value) { (value, transform) -> Output in // cannot convert value of type 'Output' to expected argument type '(inout @escaping (_, _) -> Output, Any) throws -> ()'return transforms.reduce(value) { (value, transform) -> Output in // missing argument label 'into:' in callprotocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
private var value: T
private var transforms: [((T) -> T)] = []
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> T {
return transforms.reduce(value) { $1($0) }
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
private var value: T
private var transforms: [((T) -> T)] = []
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> T {
return transforms.reduce(value) { $1($0) }
}
}
// Example usage
let pipeline = Pipeline(value: 100)
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.pipe {let pipeline = Pipeline<U>(value: value) // cannot convert value of type 'T' to expected argument type 'U'transforms.append(transform) // cannot convert value of type '(T) -> U' to expected argument type '(T) -> T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
private var transforms: [(T) -> T] = []
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
pipeline.transforms = transforms
pipeline.transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
private var transforms: [(T) -> T] = []
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
pipeline.transforms = transforms
pipeline.transforms.append(transform)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
```init(value: T) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<T>'let pipeline = Pipeline<U>(value: value) // cannot convert value of type 'T' to expected argument type 'U'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
let value: T
private var transforms: [(T) -> T] = []
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> T {
return transforms.reduce(value) { $1($0) }
}
}
extension PipelineProtocol {
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: self.execute()).pipe(transform)
}
}
extension PipelineProtocol {
func pipe(_ transform: @escaping (Output) -> Output) -> Pipeline<Output> {
return Pipeline(value: self.execute()).pipe(transform)
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
let value: T
private var transforms: [(T) -> T] = []
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: value)
transforms.append(transform)
return pipeline
}
func execute() -> T {
return transforms.reduce(value) { $1($0) }
}
}
// Extension to allow for chaining of transforms with type changes
extension PipelineProtocol {
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline(value: self.execute()).pipe(transform)
}
}
// Extension to allow for chaining of transforms with the same type
extension PipelineProtocol {
func pipe(_ transform: @escaping (Output) -> Output) -> Pipeline<Output> {
return Pipeline(value: self.execute()).pipe(transform)
}
}
// Extension to allow for chaining of transforms with the same type
extension PipelineProtocol {
func pipe(_ transform: @escaping (Output) -> Output) -> Pipeline<Output> {
return Pipeline(value: self.execute()).pipe(transform)
}
}
// Extension to allow for chaining of transforms with the same type
extension PipelineProtocol {
func pipe(_ transform: @escaping (Output) -> Output) -> Pipeline<Output> {
return Pipeline(value: self.execute()).pipe(transform)
}
}
// Extension to allow for chaining of transforms with the same type
extension PipelineProtocol {
func pipe(_ transform: @escaping (Output) -> Output) -> Pipeline<Output> {
return Pipeline(value: self.execute()).pipe(transform)
}
}
// Extension to allow for chaining of transforms with the same type
extension PipelineProtocol {
func pipe(_ transform: @escaping (Output) -> Output) -> Pipeline<Output> {
return Pipeline(value: self.execute()).pipe(transform)
}
}
// Extension to allow for chaining of transforms with the same type
extension PipelineProtocol {
func pipe(_ transform: @escaping (Output) -> Output) -> Pipeline<Output> {
return Pipeline(value: self.execute()).pipe(transform)
}
}
// Extension to allow for chaining of transforms with the same type
extension PipelineProtocol {
func pipe(_ transform: @escaping (Output) -> Output) -> Pipeline<Output> {
return Pipeline(value: self.execute()).pipe(transform)
}
}
// Extension to allow for chaining of transforms with the same type
extension PipelineProtocol {
func pipe(_ transform: @escaping (Output) -> Output) -> Pipeline<Output> {
return Pipeline(value: self.execute()).pipe(transform)
}
}
// Extension to allow for chaining of transforms with the same type
extension PipelineProtocol {
func pipe(_ transform: @escaping (Output) -> Output) -> Pipeline<Output> {
return Pipeline(value: self.execute()).pipe(transform)
}
}
// Extension to allow for chaining of transforms with the same type
extension PipelineProtocol {
func pipe(_ transform: @escaping (Output) -> Output) -> Pipeline<Output> {
return Pipeline(value: self.execute()).pipe(transform)
}
}
// Extension to allow for chaining of transforms with the same type
extension PipelineProtocol {
func pipe(_ transform: @escaping (Output) -> Output) -> Pipeline<Output> {
return Pipeline(value: self.execute()).pipe(transform)
}
}
// Extension to allow for chaining of transforms with the same type
extension PipelineProtocol {
func pipe(_ transform: @escaping (Output) -> Output) -> Pipeline<Output> {
return Pipeline(value: self.execute()).pipe(transform)
}let pipeline = Pipeline<U>(value: value) // cannot convert value of type 'T' to expected argument type 'U'transforms.append(transform) // cannot convert value of type '(T) -> U' to expected argument type '(T) -> T'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get { return value }
set {
self.value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
func notifyObservers() {
observers.forEach { (_, observer) in
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get { return value }
set {
self.value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
func notifyObservers() {
observers.forEach { (_, observer) in
observer(value)
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get { return value }
set {
self.value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
func notifyObservers() {
observers.forEach { (_, observer) in
observer(value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of '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 Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
didSet {
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
private func notifyObservers() {
observers.forEach { $0.value(value) }
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
didSet {
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
private func notifyObservers() {
observers.forEach { $0.value(value) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
didSet {
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
private func notifyObservers() {
observers.forEach { $0.value(value) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
didSet {
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
private func notifyObservers() {
observers.forEach { $0.value(value) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
didSet {
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
private func notifyObservers() {
observers.forEach { $0.value(value) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
didSet {
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribeprivate var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of '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 Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(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 {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(value) }
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(value) }
}
}
}
```class ObservableProperty<Value> : ObservablePropertyProtocol { // type 'ObservableProperty<Value>' does not conform to protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of 'value'observers.values.forEach { $0(value) } // ambiguous use of 'value'observable.value = 10 // 'value' is inaccessible due to 'private' protection levelobservable.value = 20 // 'value' is inaccessible due to 'private' protection levelobservable.value = 30 // 'value' is inaccessible due to 'private' protection levelprotocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(value) }
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(value) }
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(value) }
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(value) }
}
}
}
```class ObservableProperty<Value> : ObservablePropertyProtocol { // type 'ObservableProperty<Value>' does not conform to protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of 'value'observers.values.forEach { $0(value) } // ambiguous use of 'value'observable.value = 10 // 'value' is inaccessible due to 'private' protection levelobservable.value = 20 // 'value' is inaccessible due to 'private' protection levelobservable.value = 30 // 'value' is inaccessible due to 'private' protection levelprotocol 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 Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
get { return value }
set {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
get { return value }
set {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
get { return value }
set {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
get { return value }
set {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
get { return value }
set {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
get { return value }
set {
value = newValue
observers.values.forEach { $0(newValueprivate var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of '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 Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(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 {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(value) }
}
}
}
```class ObservableProperty<Value> : ObservablePropertyProtocol { // type 'ObservableProperty<Value>' does not conform to protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of 'value'observers.values.forEach { $0(value) } // ambiguous use of 'value'observable.value = 10 // 'value' is inaccessible due to 'private' protection levelobservable.value = 20 // 'value' is inaccessible due to 'private' protection levelobservable.value = 30 // 'value' is inaccessible due to 'private' protection levelprotocol 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> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var currentValue: Value {
return 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 notifyObservers() {
observers.forEach { $0.value(value) }
}
func set(value: Value) {
self.value = value
notifyObservers()
}
}
class ObservableStringProperty: ObservableProperty<String> {
override func set(value: String) {
self.value = value
notifyObservers()
}
}
class ObservableIntProperty: ObservableProperty<Int> {
override func set(value: Int) {
self.value = value
notifyObservers()
}
}
class ObservableBoolProperty: ObservableProperty<Bool> {
override func set(value: Bool) {
self.value = value
notifyObservers()
}
}
class ObservableDoubleProperty: ObservableProperty<Double> {
override func set(value: Double) {
self.value = value
notifyObservers()
}
}
class ObservableFloatProperty: ObservableProperty<Float> {
override func set(value: Float) {
self.value = value
notifyObservers()
}
}
class ObservableCGFloatProperty: ObservableProperty<CGFloat> {
override func set(value: CGFloat) {
self.value = value
notifyObservers()
}
}
class ObservableDateProperty: ObservableProperty<Date> {
override func set(value: Date) {
self.value = value
notifyObservers()
}
}
class ObservableURLProperty: ObservableProperty<URL> {
override func set(value: URL) {
self.value = value
notifyObservers()
}
}
class ObservableDataProperty: ObservableProperty<Data> {
override func set(value: Data) {
self.value = value
notifyObservers()
}
}
class ObservableArrayProperty<T>: ObservableProperty<[T]> {
override func set(value: [T]) {
self.value = value
notifyObservers()
}
}
class ObservableDictionaryProperty<Key, Value>: ObservableProperty<[Key: Value]> {
override func set(value: [Key: Value]) {
self.value = value
notifyObservers()
}
}
class ObservableSetProperty<T>: ObservableProperty<Set<T>> {
override func set(value: Set<T>) {
self.value = value
notifyObservers()
}
}
class ObservableOptionalProperty<T>: ObservableProperty<T?> {
override func set(value: T?) {
self.value = value
notifyObservers()
}
}```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> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var currentValue: Value {
return 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 notifyObservers() {
observers.forEach { $0.value(value) }
}
func set(value: Value) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableStringProperty: ObservableProperty<String> {
override func set(value: String) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableIntProperty: ObservableProperty<Int> {
override func set(value: Int) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableBoolProperty: ObservableProperty<Bool> {
override func set(value: Bool) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableDoubleProperty: ObservableProperty<Double> {
override func set(value: Double) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableFloatProperty: ObservableProperty<Float> {
override func set(value: Float) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableCGFloatProperty: ObservableProperty<CGFloat> {
override func set(value: CGFloat) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableDateProperty: ObservableProperty<Date> {
override func set(value: Date) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableURLProperty: ObservableProperty<URL> {
override func set(value: URL) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableDataProperty: ObservableProperty<Data> {
override func set(value: Data) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableArrayProperty<T>: ObservableProperty<[T]> {
override func set(value: [T]) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableDictionaryProperty<Key, Value>: ObservableProperty<[Key: Value]> {
override func set(value: [Key: Value]) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableSetProperty<T>: ObservableProperty<Set<T>> {
override func set(value: Set<T>) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableOptionalProperty<T>: ObservableProperty<T?> {
override func set(value: T?) {
self.value = value
notifyObservers()
}
}
// Observable property that notifies observers of value changes.
class ObservableImplicitlyUnwrappedOptionalProperty<T>: ObservableProperty<T> {
override func set(value: T) {
self.value = value
notifyObservers()
}
self.value = value // 'value' is inaccessible due to 'private' protection levelself.value = value // 'value' is inaccessible due to 'private' protection levelself.value = value // 'value' is inaccessible due to 'private' protection levelself.value = value // 'value' is inaccessible due to 'private' protection levelself.value = value // 'value' is inaccessible due to 'private' protection levelself.value = value // 'value' is inaccessible due to 'private' protection levelself.value = value // 'value' is inaccessible due to 'private' protection levelself.value = value // 'value' is inaccessible due to 'private' protection levelself.value = value // 'value' is inaccessible due to 'private' protection levelself.value = value // 'value' is inaccessible due to 'private' protection levelclass ObservableDictionaryProperty<Key, Value>: ObservableProperty<[Key: Value]> { // type 'Key' does not conform to protocol 'Hashable'override func set(value: [Key: Value]) { // type 'Key' does not conform to protocol 'Hashable'self.value = value // 'value' is inaccessible due to 'private' protection levelclass ObservableSetProperty<T>: ObservableProperty<Set<T>> { // type 'T' does not conform to protocol 'Hashable'override func set(value: Set<T>) { // method does not override any method from its superclassoverride func set(value: Set<T>) { // type 'T' does not conform to protocol 'Hashable'self.value = value // type of expression is ambiguous without a type annotationnotifyObservers() // type of expression is ambiguous without a type annotationself.value = value // 'value' is inaccessible due to 'private' protection levelobservable.value = 10 // 'value' is inaccessible due to 'private' protection levelobservable.value = 20 // 'value' is inaccessible due to 'private' protection levelobservable.value = 30 // 'value' is inaccessible due to 'private' protection levelprotocol 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 Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(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 {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(value) }
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(value) }
}
}
}
```class ObservableProperty<Value> : ObservablePropertyProtocol { // type 'ObservableProperty<Value>' does not conform to protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of 'value'observers.values.forEach { $0(value) } // ambiguous use of 'value'observable.value = 10 // 'value' is inaccessible due to 'private' protection levelobservable.value = 20 // 'value' is inaccessible due to 'private' protection levelobservable.value = 30 // 'value' is inaccessible due to 'private' protection levelprotocol 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> {
private var observers = [UUID: (Value) -> Void]()
private var value: Value
init(value: Value) {
self.value = value
}
var currentValue: Value {
return value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
func update(value: Value) {
self.value = value
observers.values.forEach { $0(value) }
}
}
class ObservableString: ObservablePropertyProtocol {
typealias Value = String
init(value: String) {
super.init(value: value)
}
var value: String {
didSet {
update(value: value)
}
}
func subscribe(_ observer: @escaping (String) -> Void) -> UUID {
return super.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
super.unsubscribe(observer)
}
func update(value: String) {
super.update(value: value)
}
}
class ObservableInt: ObservablePropertyProtocol {
typealias Value = Int
init(value: Int) {
super.init(value: value)
}
var value: Int {
didSet {
update(value: value)
}
}
func subscribe(_ observer: @escaping (Int) -> Void) -> UUID {
return super.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
super.unsubscribe(observer)
}
func update(value: Int) {
super.update(value: value)
}
}
class ObservableBool: ObservablePropertyProtocol {
typealias Value = Bool
init(value: Bool) {
super.init(value: value)
}
var value: Bool {
didSet {
update(value: value)
}
}
func subscribe(_ observer: @escaping (Bool) -> Void) -> UUID {
return super.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
super.unsubscribe(observer)
}
func update(value: Bool) {
super.update(value: value)
}
}
class ObservableDouble: ObservablePropertyProtocol {
typealias Value = Double
init(value: Double) {
super.init(value: value)
}
var value: Double {
didSet {
update(value: value)
}
}
func subscribe(_ observer: @escaping (Double) -> Void) -> UUID {
return super.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
super.unsubscribe(observer)
}
func update(value: Double) {
super.update(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> {
private var observers = [UUID: (Value) -> Void]()
private var value: Value
init(value: Value) {
self.value = value
}
var currentValue: Value {
return value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
func update(value: Value) {
self.value = value
observers.values.forEach { $0(value) }
}
}
// Observable property that notifies observers of value changes.
class ObservableString: ObservablePropertyProtocol {
typealias Value = String
init(value: String) {
super.init(value: value)
}
var value: String {
didSet {
update(value: value)
}
}
func subscribe(_ observer: @escaping (String) -> Void) -> UUID {
return super.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
super.unsubscribe(observer)
}
func update(value: String) {
super.update(value: value)
}
}
// Observable property that notifies observers of value changes.
class ObservableInt: ObservablePropertyProtocol {
typealias Value = Int
init(value: Int) {
super.init(value: value)
}
var value: Int {
didSet {
update(value: value)
}
}
func subscribe(_ observer: @escaping (Int) -> Void) -> UUID {
return super.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
super.unsubscribe(observer)
}
func update(value: Int) {
super.update(value: value)
}
}
// Observable property that notifies observers of value changes.
class ObservableBool: ObservablePropertyProtocol {
typealias Value = Bool
init(value: Bool) {
super.init(value: value)
}
var value: Bool {
didSet {
update(value: value)
}
}
func subscribe(_ observer: @escaping (Bool) -> Void) -> UUID {
return super.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
super.unsubscribe(observer)
}
func update(value: Bool) {
super.update(value: value)
}
}
// Observable property that notifies observers of value changes.
class ObservableDouble: ObservablePropertyProtocol {
typealias Value = Double
init(value: Double) {
super.init(value: value)
}
var value: Double {
didSet {
update(value: value)
}
}
func subscribe(_ observer: @escaping (Double) -> Void) -> UUID {
return super.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
super.unsubscribe(observer)
}
func update(value: Double) {
super.update(value: value)
}
}
// Observable property that notifies observers of value changes.
class ObservableFloat: ObservablePropertyProtocol {
typealias Value = Float
init(value: Float) {
super.init(value: value)
}
var value: Float {
didSet {
update(value: value)
}
}
func subscribe(_ observer: @escaping (Float) -> Void) -> UUID {
return super.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
super.unsubscribe(observer)init(value: String) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableString'super.init(value: value) // 'super' members cannot be referenced in a root classreturn super.subscribe(observer) // 'super' members cannot be referenced in a root classsuper.unsubscribe(observer) // 'super' members cannot be referenced in a root classsuper.update(value: value) // 'super' members cannot be referenced in a root classinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableInt'super.init(value: value) // 'super' members cannot be referenced in a root classreturn super.subscribe(observer) // 'super' members cannot be referenced in a root classsuper.unsubscribe(observer) // 'super' members cannot be referenced in a root classsuper.update(value: value) // 'super' members cannot be referenced in a root classinit(value: Bool) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableBool'super.init(value: value) // 'super' members cannot be referenced in a root classreturn super.subscribe(observer) // 'super' members cannot be referenced in a root classsuper.unsubscribe(observer) // 'super' members cannot be referenced in a root classsuper.update(value: value) // 'super' members cannot be referenced in a root classinit(value: Double) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableDouble'super.init(value: value) // 'super' members cannot be referenced in a root classreturn super.subscribe(observer) // 'super' members cannot be referenced in a root classsuper.unsubscribe(observer) // 'super' members cannot be referenced in a root classsuper.update(value: value) // 'super' members cannot be referenced in a root classobservable.value = 10 // 'value' is inaccessible due to 'private' protection levelobservable.value = 20 // 'value' is inaccessible due to 'private' protection levelobservable.value = 30 // 'value' is inaccessible due to 'private' protection levelprotocol 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 Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(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 {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
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)
}
var value: Value {
didSet {
observers.values.forEach { $0(value) }
}
}
}
```class ObservableProperty<Value> : ObservablePropertyProtocol { // type 'ObservableProperty<Value>' does not conform to protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of 'value'observers.values.forEach { $0(value) } // ambiguous use of 'value'observable.value = 10 // 'value' is inaccessible due to 'private' protection levelobservable.value = 20 // 'value' is inaccessible due to 'private' protection levelobservable.value = 30 // 'value' is inaccessible due to 'private' protection levelprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set {
value = min(max(newValue, range.lowerBound), range.upperBound)
}
}
}
extension Clamped: ClampedProtocol {
typealias Value = Int
}
struct Point {
@Clamped(10, 20...) var x: Int
@Clamped(10, 20...) var y: 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 value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set {
value = min(max(newValue, range.lowerBound), range.upperBound)
}
}
}
extension Clamped: ClampedProtocol {
typealias Value = Int
}
struct Point {
@Clamped(10, 20...) var x: Int
@Clamped(10, 20...) var y: Int
}
let point = Point(x: 100, y: 100)
point.x = 1000
point.y = -1000
print(point.x) // 20
print(point.y) // 10
```extension Clamped: ClampedProtocol { // type 'Clamped<Value>' does not conform to protocol 'ClampedProtocol'@Clamped(10, 20...) var x: Int // missing argument label 'wrappedValue:' in call@Clamped(10, 20...) var x: Int // cannot convert value of type 'PartialRangeFrom<Int>' to expected argument type 'Int'@Clamped(10, 20...) var x: Int // cannot convert value of type 'Int' to expected argument type 'ClosedRange<Int>'@Clamped(10, 20...) var y: Int // cannot convert value of type 'Int' to expected argument type 'ClosedRange<Int>'@Clamped(10, 20...) var y: Int // missing argument label 'wrappedValue:' in call@Clamped(10, 20...) var y: Int // cannot convert value of type 'PartialRangeFrom<Int>' to expected argument type 'Int'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = clamp(newValue) }
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
private func clamp(_ value: Value) -> Value {
return Swift.max(range.lowerBound, Swift.min(range.upperBound, value))
}
}
extension Clamped: ClampedProtocol {
typealias Value = Double
}
extension Clamped: Equatable where Value: Equatable { }
extension Clamped: Hashable where Value: Hashable { }
extension Clamped: Codable where Value: Codable { }
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: ["value": value])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: 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 value: Value
private var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = clamp(newValue) }
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
private func clamp(_ value: Value) -> Value {
return Swift.max(range.lowerBound, Swift.min(range.upperBound, value))
}
}
extension Clamped: ClampedProtocol {
typealias Value = Double
}
extension Clamped: Equatable where Value: Equatable { }
extension Clamped: Hashable where Value: Hashable { }
extension Clamped: Codable where Value: Codable { }
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: ["value": value])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: ["value": value])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: ["value": value])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: ["value": value])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: ["value": value])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clextension Clamped: ClampedProtocol { // type 'Clamped<Value>' does not conform to protocol 'ClampedProtocol'extension Clamped: CustomStringConvertible { // type 'Clamped<Value>' does not conform to protocol 'CustomStringConvertible'extension Clamped: CustomStringConvertible { // redundant conformance of 'Clamped<Value>' to protocol 'CustomStringConvertible'var description: String { // invalid redeclaration of 'description'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set {
value = newValue < range.lowerBound ? range.lowerBound :
newValue > range.upperBound ? range.upperBound : newValue
}
}
}
extension Clamped: ClampedProtocol {
typealias Value = Int
}
struct SomeStruct {
@Clamped(wrappedValue: 10, 0...100)
var someValue: 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 value: Value
private var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set {
value = newValue < range.lowerBound ? range.lowerBound :
newValue > range.upperBound ? range.upperBound : newValue
}
}
}
extension Clamped: ClampedProtocol {
typealias Value = Int
}
struct SomeStruct {
@Clamped(wrappedValue: 10, 0...100)
var someValue: Int
}
let someStruct = SomeStruct()
someStruct.someValue = 1000
print(someStruct.someValue) // 100
```extension Clamped: ClampedProtocol { // type 'Clamped<Value>' does not conform to protocol 'ClampedProtocol'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set {
value = newValue < range.lowerBound ? range.lowerBound :
newValue > range.upperBound ? range.upperBound :
newValue
}
}
}
extension Clamped: ClampedProtocol {
typealias Value = Int
}
struct Player {
@Clamped(10, 0...100)
var score: 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 value: Value
private var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set {
value = newValue < range.lowerBound ? range.lowerBound :
newValue > range.upperBound ? range.upperBound :
newValue
}
}
}
extension Clamped: ClampedProtocol {
typealias Value = Int
}
struct Player {
@Clamped(10, 0...100)
var score: Int
}
let player = Player()
player.score = -100
print(player.score) // 0
player.score = 101
print(player.score) // 100
```extension Clamped: ClampedProtocol { // type 'Clamped<Value>' does not conform to protocol 'ClampedProtocol'@Clamped(10, 0...100) // cannot convert value of type 'ClosedRange<Int>' to expected argument type 'Int'@Clamped(10, 0...100) // cannot convert value of type 'Int' to expected argument type 'ClosedRange<Int>'@Clamped(10, 0...100) // missing argument label 'wrappedValue:' in callprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private var range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set {
value = newValue < range.lowerBound ? range.lowerBound :
newValue > range.upperBound ? range.upperBound : newValue
}
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
extension Clamped: ClampedProtocol { }
struct Foo {
@Clamped(wrappedValue: 10, 0...100) var bar: 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 value: Value
private var range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set {
value = newValue < range.lowerBound ? range.lowerBound :
newValue > range.upperBound ? range.upperBound : newValue
}
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
extension Clamped: ClampedProtocol { }
struct Foo {
@Clamped(wrappedValue: 10, 0...100) var bar: Int
}
let foo = Foo()
foo.bar = 200 // bar is now 100
```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>
var wrappedValue: Value {
get { value }
set {
value = newValue < range.lowerBound ? range.lowerBound :
newValue > range.upperBound ? range.upperBound :
newValue
}
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
extension Clamped: ClampedProtocol {
typealias Value = Int
}
extension Clamped: Equatable where Value: Equatable {}
extension Clamped: Hashable where Value: Hashable {}
extension Clamped: Codable where Value: Codable {}
extension Clamped: CustomStringConvertible {
var description: String {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: [
"wrappedValue": wrappedValue,
"range": range
])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set {
value = newValue < range.lowerBound ? range.lowerBound :
newValue > range.upperBound ? range.upperBound :
newValue
}
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
extension Clamped: ClampedProtocol {
typealias Value = Int
}
extension Clamped: Equatable where Value: Equatable {}
extension Clamped: Hashable where Value: Hashable {}
extension Clamped: Codable where Value: Codable {}
extension Clamped: CustomStringConvertible {
var description: String {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: [
"wrappedValue": wrappedValue,
"range": range
])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: [
"wrappedValue": wrappedValue,
"range": range
])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: [
"wrappedValue": wrappedValue,
"range": range
])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(wrappedValue: \(wrappedValue), range: \(range))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: [
"wrappedValue": wrappedValue,
"range": range
])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return "Clamped(wextension Clamped: ClampedProtocol { // type 'Clamped<Value>' does not conform to protocol 'ClampedProtocol'extension Clamped: CustomStringConvertible { // type 'Clamped<Value>' does not conform to protocol 'CustomStringConvertible'extension Clamped: CustomStringConvertible { // redundant conformance of 'Clamped<Value>' to protocol 'CustomStringConvertible'var description: String { // invalid redeclaration of 'description'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = clamp(newValue) }
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
private func clamp(_ value: Value) -> Value {
return Swift.max(range.lowerBound, Swift.min(range.upperBound, value))
}
}
extension Clamped: ClampedProtocol {
typealias Value = Int
}
extension Clamped: Equatable where Value: Equatable { }
extension Clamped: Hashable where Value: Hashable { }
extension Clamped: Codable where Value: Codable { }
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: ["value": value])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: 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 value: Value
private var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = clamp(newValue) }
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
private func clamp(_ value: Value) -> Value {
return Swift.max(range.lowerBound, Swift.min(range.upperBound, value))
}
}
extension Clamped: ClampedProtocol {
typealias Value = Int
}
extension Clamped: Equatable where Value: Equatable { }
extension Clamped: Hashable where Value: Hashable { }
extension Clamped: Codable where Value: Codable { }
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: ["value": value])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: ["value": value])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: ["value": value])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: ["value": value])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomReflectable {
var customMirror: Mirror {
return Mirror(self, children: ["value": value])
}
}
extension Clamped: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return String(describing: value)
}
}
extension Clextension Clamped: ClampedProtocol { // type 'Clamped<Value>' does not conform to protocol 'ClampedProtocol'extension Clamped: CustomStringConvertible { // type 'Clamped<Value>' does not conform to protocol 'CustomStringConvertible'extension Clamped: CustomStringConvertible { // redundant conformance of 'Clamped<Value>' to protocol 'CustomStringConvertible'var description: String { // invalid redeclaration of 'description'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>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set {
value = min(max(newValue, range.lowerBound), range.upperBound)
}
}
}
extension Clamped: ClampedProtocol {
typealias Value = Int
}
extension Clamped: Equatable where Value: Equatable { }
extension Clamped: Hashable where Value: Hashable { }
extension Clamped: Codable where Value: Codable { }
extension Clamped: CustomStringConvertible where Value: CustomStringConvertible {
var description: String {
return value.description
}
}
extension Clamped: CustomDebugStringConvertible where Value: CustomDebugStringConvertible {
var debugDescription: String {
return value.debugDescription
}
}
extension Clamped: CustomReflectable where Value: CustomReflectable {
var customMirror: Mirror {
return value.customMirror
}
}
extension Clamped: CustomPlaygroundDisplayConvertible where Value: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value.playgroundDescription
}
}
extension Clamped: CustomStringConvertible where Value: CustomStringConvertible {
var description: String {
return value.description
}
}```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>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set {
value = min(max(newValue, range.lowerBound), range.upperBound)
}
}
}
extension Clamped: ClampedProtocol {
typealias Value = Int
}
extension Clamped: Equatable where Value: Equatable { }
extension Clamped: Hashable where Value: Hashable { }
extension Clamped: Codable where Value: Codable { }
extension Clamped: CustomStringConvertible where Value: CustomStringConvertible {
var description: String {
return value.description
}
}
extension Clamped: CustomDebugStringConvertible where Value: CustomDebugStringConvertible {
var debugDescription: String {
return value.debugDescription
}
}
extension Clamped: CustomReflectable where Value: CustomReflectable {
var customMirror: Mirror {
return value.customMirror
}
}
extension Clamped: CustomPlaygroundDisplayConvertible where Value: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value.playgroundDescription
}
}
extension Clamped: CustomStringConvertible where Value: CustomStringConvertible {
var description: String {
return value.description
}
}
extension Clamped: CustomDebugStringConvertible where Value: CustomDebugStringConvertible {
var debugDescription: String {
return value.debugDescription
}
}
extension Clamped: CustomReflectable where Value: CustomReflectable {
var customMirror: Mirror {
return value.customMirror
}
}
extension Clamped: CustomPlaygroundDisplayConvertible where Value: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value.playgroundDescription
}
}
extension Clamped: CustomStringConvertible where Value: CustomStringConvertible {
var description: String {
return value.description
}
}
extension Clamped: CustomDebugStringConvertible where Value: CustomDebugStringConvertible {
var debugDescription: String {
return value.debugDescription
}
}
extension Clamped: CustomReflectable where Value: CustomReflectable {
var customMirror: Mirror {
return value.customMirror
}
}
extension Clamped: CustomPlaygroundDisplayConvertible where Value: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value.playgroundDescription
}
}
extension Clamped: CustomStringConvertible where Value: CustomStringConvertible {
var description: String {
return value.description
}
}
extension Clamped: CustomDebugStringConvertible where Value: CustomDebugStringConvertible {
var debugDescription: String {
return value.debugDescription
}
}
extension Clamped: CustomReflectable where Value: CustomReflectable {
var customMirror: Mirror {
return value.customMirror
}
}
extension Clamped: CustomPlaygroundDisplayConvertible where Value: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value.playgroundDescription
}
}
extension Clamped: CustomStringConvertible where Value: CustomStringConvertible {
var description: String {
return value.description
}
}
extension Clamped: CustomDebugStringConvertible where Value: CustomDebugStringConvertible {
var debugDescription: String {
return value.debugDescription
}
}
extension Clamped: CustomReflectable where Value: CustomReflectable {
var customMirror: Mirror {
return value.customMirror
}
}
extension Clamped: CustomPlaygroundDisplayConvertible where Value: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return value.playgroundDescription
}
}
extensionextension Clamped: ClampedProtocol { // type 'Clamped<Value>' does not conform to protocol 'ClampedProtocol'extension Clamped: CustomStringConvertible where Value: CustomStringConvertible { // type 'Clamped<Value>' does not conform to protocol 'CustomStringConvertible'extension Clamped: CustomStringConvertible where Value: CustomStringConvertible { // redundant conformance of 'Clamped<Value>' to protocol 'CustomStringConvertible'var description: String { // invalid redeclaration of 'description'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>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = clamp(newValue) }
}
var projectedValue: Clamped<Value> { self }
private func clamp(_ value: Value) -> Value {
return Swift.max(range.lowerBound, Swift.min(range.upperBound, 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 value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = clamp(newValue) }
}
var projectedValue: Clamped<Value> { self }
private func clamp(_ value: Value) -> Value {
return Swift.max(range.lowerBound, Swift.min(range.upperBound, value))
}
}
// Example usage
@Clamped(10, 1...100)
var x: Int
x = 200 // x is now 100
```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>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set {
if value < range.lowerBound {
value = range.lowerBound
} else if value > range.upperBound {
value = range.upperBound
} else {
value = newValue
}
}
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set {
if value < range.lowerBound {
value = range.lowerBound
} else if value > range.upperBound {
value = range.upperBound
} else {
value = newValue
}
}
}
}
``` // XCTAssertEqual failed: (15) is not equal to (10)enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
struct User {
@Logged(wrappedValue: "Bob", logger: print)
var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A type that conforms to LoggedProtocol.
struct User {
@Logged(wrappedValue: "Bob", logger: print)
var name: String
}
let user = User()
user.name = "Alice"
print(user.name)
```struct Logged<Value>: LoggedProtocol { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
class Person {
@Logged(wrappedValue: "Bob", logger: print)
var name: String
init(name: String) {
self.name = name
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
class Person {
@Logged(wrappedValue: "Bob", logger: print)
var name: String
init(name: String) {
self.name = name
}
}
let person = Person(name: "Bob")
person.name = "Alice"
person.name = "Eve"
```struct Logged<Value>: LoggedProtocol { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value: Any> {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.logger = logger
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
class Person: LoggedProtocol {
typealias Value = String
init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
self.logger = logger
self.wrappedValue = wrappedValue
}
var wrappedValue: String {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value: Any> {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.logger = logger
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
class Person: LoggedProtocol {
typealias Value = String
init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
self.logger = logger
self.wrappedValue = wrappedValue
}
var wrappedValue: String {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
let person = Person(wrappedValue: "Bob", logger: { event, value in
print("\(event) \(value)")
})
person.wrappedValue = "Alice"
person.wrappedValue = "Bob"
person.wrappedValue = "Carol"
```struct Logged<Value: Any> { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'init(wrappedValue: String, logger: @escaping (Event, String) -> Void) { // initializer requirement 'init(wrappedValue:logger:)' can only be satisfied by a 'required' initializer in non-final class 'Person'self.logger = logger // value of type 'Person' has no member 'logger'logger(.get, wrappedValue) // cannot infer contextual base in reference to member 'get'logger(.get, wrappedValue) // cannot find 'logger' in scopereturn wrappedValue // attempting to access 'wrappedValue' within its own getterlogger(.set, newValue) // cannot find 'logger' in scopelogger(.set, newValue) // cannot infer contextual base in reference to member 'set'wrappedValue = newValue // attempting to modify 'wrappedValue' within its own setterenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
struct User: LoggedProtocol {
typealias Value = String
init(wrappedValue: String, logger: @escaping (Event, String) -> 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> {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
struct User: LoggedProtocol {
typealias Value = String
init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
var log: (Event, String) -> Void = { _, _ in }
@Logged(wrappedValue: "", logger: log)
var name: String
name = "John"
name = "Jane"
name.append("!")
name.append("!")
name = "Jim"
log = { print("Event: \($0), Value: \($1)") }
name = "Jim"
name.append("!")
name.append("!")
name = "Jim"
```struct Logged<Value> { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'self.wrappedValue = wrappedValue // value of type 'User' has no member 'wrappedValue'self.logger = logger // value of type 'User' has no member 'logger'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value: Any>: LoggedProtocol {
private let logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.logger = logger
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
struct Person {
@Logged(wrappedValue: "John", logger: print)
var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value: Any>: LoggedProtocol {
private let logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.logger = logger
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// Usage
struct Person {
@Logged(wrappedValue: "John", logger: print)
var name: String
}
let person = Person()
person.name = "Jane"
print(person.name)
```struct Logged<Value: Any>: LoggedProtocol { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value: Any>: LoggedProtocol {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
class Person {
@Logged(wrappedValue: "John", logger: { print("Person:", $0, $1) })
var name: String
init(name: String) {
self.name = name
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value: Any>: LoggedProtocol {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// Example of usage
class Person {
@Logged(wrappedValue: "John", logger: { print("Person:", $0, $1) })
var name: String
init(name: String) {
self.name = name
}
}
let person = Person(name: "John")
print(person.name)
person.name = "Jane"
print(person.name)
```struct Logged<Value: Any>: LoggedProtocol { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value: Any> {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, value)
value = newValue
}
}
}
struct User {
@Logged<String> var name: String
@Logged<Int> var age: Int
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value: Any> {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, value)
value = newValue
}
}
}
struct User {
@Logged<String> var name: String
@Logged<Int> var age: Int
}
var user = User(name: "John Appleseed", age: 42)
user.name = "Bill"
user.age = 21
// Prints:
// get, "John Appleseed"
// set, "Bill"
// get, 42
// set, 21
``` // XCTAssertEqual failed: (["Accessing value: 0", "Setting value: 0"]) is not equal to (["Accessing value: 0", "Setting value: 10"])enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value: Any> {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, value)
value = newValue
}
}
}
struct Person: LoggedProtocol {
typealias Value = String
init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
self.logger = logger
}
var name: String {
get {
logger(.get, value)
return value
}
set {
logger(.set, value)
value = newValue
}
}
var logger: (Event, Value) -> Void
var value: Value
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value: Any> {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, value)
value = newValue
}
}
}
// Usage
struct Person: LoggedProtocol {
typealias Value = String
init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
self.logger = logger
}
var name: String {
get {
logger(.get, value)
return value
}
set {
logger(.set, value)
value = newValue
}
}
var logger: (Event, Value) -> Void
var value: Value
}
let person = Person(wrappedValue: "Bob", logger: { (event, value) in
print("Person: \(event) \(value)")
})
person.name = "Jane"
print(person.name)
```} // return from initializer without initializing all stored propertiesenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// Usage
var log: [(Event, Int)] = []
@Logged(wrappedValue: 0, logger: { log.append($0) })
var counter: Int
counter = 1
counter = 2
print(log)
// Prints:
// [(get, 0), (set, 1), (set, 2)]
```struct Logged<Value>: LoggedProtocol { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value: Any> {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.logger = logger
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
self.wrappedValue = newValue
}
}
}
class Person: LoggedProtocol {
typealias Value = String
init(wrappedValue: String, logger: @escaping (Event, Value) -> Void) {
self.logger = logger
self.wrappedValue = wrappedValue
}
var wrappedValue: String {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
self.wrappedValue = newValue
}
}
}
func log(_ event: Event, _ value: String) {
print("\(event) \(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: Any> {
private var logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.logger = logger
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
self.wrappedValue = newValue
}
}
}
class Person: LoggedProtocol {
typealias Value = String
init(wrappedValue: String, logger: @escaping (Event, Value) -> Void) {
self.logger = logger
self.wrappedValue = wrappedValue
}
var wrappedValue: String {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
self.wrappedValue = newValue
}
}
}
func log(_ event: Event, _ value: String) {
print("\(event) \(value)")
}
var person = Person(wrappedValue: "Bob", logger: log)
person.wrappedValue = "Sue"
person.wrappedValue = "Tom"
```struct Logged<Value: Any> { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'init(wrappedValue: String, logger: @escaping (Event, Value) -> Void) { // initializer requirement 'init(wrappedValue:logger:)' can only be satisfied by a 'required' initializer in non-final class 'Person'self.logger = logger // value of type 'Person' has no member 'logger'logger(.get, wrappedValue) // cannot infer contextual base in reference to member 'get'logger(.get, wrappedValue) // cannot find 'logger' in scopereturn wrappedValue // attempting to access 'wrappedValue' within its own getterlogger(.set, newValue) // cannot find 'logger' in scopelogger(.set, newValue) // cannot infer contextual base in reference to member 'set'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 searchResults: [String] = []
var selectedCity: String?
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults.append(character)
return nil
case .keyboardDeleteBackwards:
searchResults.removeLast()
return nil
case .searchButtonPress:
guard let city = selectedCity else { return nil }
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchResults: [String] = []
var selectedCity: String?
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults.append(character)
return nil
case .keyboardDeleteBackwards:
searchResults.removeLast()
return nil
case .searchButtonPress:
guard let city = selectedCity else { return nil }
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
```init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'searchResults.append(character) // cannot convert value of type 'Character' to expected argument type 'String'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: String = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText += String(character)
return nil
case .keyboardDeleteBackwards:
searchText = String(searchText.dropLast())
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
}
}```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: String = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText += String(character)
return nil
case .keyboardDeleteBackwards:
searchText = String(searchText.dropLast())
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
}
}
```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 searchResults: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults.append(String(character))
return nil
case .keyboardDeleteBackwards:
searchResults.removeLast()
return nil
case .searchButtonPress:
guard let city = searchResults.joined() else { return nil }
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchResults: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults.append(String(character))
return nil
case .keyboardDeleteBackwards:
searchResults.removeLast()
return nil
case .searchButtonPress:
guard let city = searchResults.joined() else { return nil }
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
```init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'guard let city = searchResults.joined() else { return nil } // initializer for conditional binding must have Optional type, not 'String'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 searchResults: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults.append(String(character))
return nil
case .keyboardDeleteBackwards:
searchResults.removeLast()
return nil
case .searchButtonPress:
guard let city = searchResults.joined() else {
return .failure(city: "No city")
}
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
class OpenWeatherMapProvider: WeatherProvider {
let apiKey: String
init(apiKey: String) {
self.apiKey = apiKey
}
func forecast(for city: String) throws -> String {
let url = URL(string: "https://api.openweathermap.org/data/2.5/weather?q=\(city)&appid=\(apiKey)")!
let (data, response) = try URLSession.shared.cachedData(for: url)
guard let response = response as? HTTPURLResponse, response.statusCode == 200 else {
throw WeatherError.invalidResponse
}
guard let data = data else {
throw WeatherError.invalidData
}
guard let response = try JSONDecoder().decode(OpenWeatherMapResponse.self, from: data) else {
throw WeatherError.invalidResponse
}
return response.weather.description
}
}
struct OpenWeatherMapResponse: Decodable {
let weather: Weather
}
struct Weather: Decodable {
let description: String
}
enum WeatherError: Error {
case invalidResponse
case invalidData
}
protocol WeatherApplicationProtocol {
init(provider: WeatherProvider)
func handle(action: UserAction) -> ApplicationFeedback?
}
class WeatherApplication: WeatherApplicationProtocol, WeatherApplicationDependencies, WeatherApplicationInteractions {
let provider: WeatherProvider
var searchResults: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults.append(String(character))
return nil
case .keyboardDeleteBackwards:
searchResults.removeLast()
return nil
case .searchButtonPress:
guard let city = searchResults.joined() else {
return .failure(city: "No city")
}
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchResults: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults.append(String(character))
return nil
case .keyboardDeleteBackwards:
searchResults.removeLast()
return nil
case .searchButtonPress:
guard let city = searchResults.joined() else {
return .failure(city: "No city")
}
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
// Weather provider implementation.
// Use OpenWeatherMap API to check forecast.
class OpenWeatherMapProvider: WeatherProvider {
let apiKey: String
init(apiKey: String) {
self.apiKey = apiKey
}
func forecast(for city: String) throws -> String {
let url = URL(string: "https://api.openweathermap.org/data/2.5/weather?q=\(city)&appid=\(apiKey)")!
let (data, response) = try URLSession.shared.cachedData(for: url)
guard let response = response as? HTTPURLResponse, response.statusCode == 200 else {
throw WeatherError.invalidResponse
}
guard let data = data else {
throw WeatherError.invalidData
}
guard let response = try JSONDecoder().decode(OpenWeatherMapResponse.self, from: data) else {
throw WeatherError.invalidResponse
}
return response.weather.description
}
}
// OpenWeatherMap API response model.
struct OpenWeatherMapResponse: Decodable {
let weather: Weather
}
// OpenWeatherMap API weather model.
struct Weather: Decodable {
let description: String
}
// Weather error.
enum WeatherError: Error {
case invalidResponse
case invalidData
}
// Weather application protocol.
protocol WeatherApplicationProtocol {
init(provider: WeatherProvider)
func handle(action: UserAction) -> ApplicationFeedback?
}
// Weather application dependencies.
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
// Weather application interactions.
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
// Weather application.
class WeatherApplication: WeatherApplicationProtocol, WeatherApplicationDependencies, WeatherApplicationInteractions {
let provider: WeatherProvider
var searchResults: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults.append(String(character))
return nil
case .keyboardDeleteBackwards:
searchResults.removeLast()
return nil
case .searchButtonPress:
guard let city = searchResults.joined() else {
return .failure(city: "No city")
}
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
// Weather application dependencies.
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
// Weather application interactions.
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
// Weather application.
class WeatherApplication: WeatherApplicationProtocol, WeatherApplicationDependencies, WeatherApplicationInteractions {
let provider: WeatherProvider
var searchResults: [String] = []
init(provider: WeatherProvider)class WeatherApplication: WeatherApplicationProtocol { // 'WeatherApplicationProtocol' is ambiguous for type lookup in this contextinit(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'guard let city = searchResults.joined() else { // initializer for conditional binding must have Optional type, not 'String'let (data, response) = try URLSession.shared.cachedData(for: url) // value of type 'URLSession' has no member 'cachedData'protocol WeatherApplicationProtocol { // invalid redeclaration of 'WeatherApplicationProtocol'class WeatherApplication: WeatherApplicationProtocol, WeatherApplicationDependencies, WeatherApplicationInteractions { // redundant conformance of 'WeatherApplication' to protocol 'WeatherApplicationDependencies'class WeatherApplication: WeatherApplicationProtocol, WeatherApplicationDependencies, WeatherApplicationInteractions { // invalid redeclaration of 'WeatherApplication'class WeatherApplication: WeatherApplicationProtocol, WeatherApplicationDependencies, WeatherApplicationInteractions { // redundant conformance of 'WeatherApplication' to protocol 'WeatherApplicationInteractions'class WeatherApplication: WeatherApplicationProtocol, WeatherApplicationDependencies, WeatherApplicationInteractions { // 'WeatherApplicationProtocol' is ambiguous for type lookup in this contextinit(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'guard let city = searchResults.joined() else { // initializer for conditional binding must have Optional type, not 'String'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 searchResults: [String] = []
private var selectedResultIndex: Int?
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults.append(character)
return nil
case .keyboardDeleteBackwards:
searchResults.removeLast()
return nil
case .searchButtonPress:
guard let city = searchResults.joined() else { return nil }
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchResults: [String] = []
private var selectedResultIndex: Int?
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults.append(character)
return nil
case .keyboardDeleteBackwards:
searchResults.removeLast()
return nil
case .searchButtonPress:
guard let city = searchResults.joined() else { return nil }
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
```searchResults.append(character) // cannot convert value of type 'Character' to expected argument type 'String'guard let city = searchResults.joined() else { return nil } // initializer for conditional binding must have Optional type, not 'String'protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText: String = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText += String(character)
return nil
case .keyboardDeleteBackwards:
searchBarText = String(searchBarText.dropLast())
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText: String = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText += String(character)
return nil
case .keyboardDeleteBackwards:
searchBarText = String(searchBarText.dropLast())
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
```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 searchBar: SearchBar
var forecast: String?
init(provider: WeatherProvider) {
self.provider = provider
self.searchBar = SearchBar()
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBar.append(character)
return nil
case .keyboardDeleteBackwards:
searchBar.deleteBackwards()
return nil
case .searchButtonPress:
do {
forecast = try provider.forecast(for: searchBar.text)
return .success(city: searchBar.text, forecast: forecast!)
} catch {
return .failure(city: searchBar.text)
}
}
}
}```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 searchBar: SearchBar
var forecast: String?
init(provider: WeatherProvider) {
self.provider = provider
self.searchBar = SearchBar()
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBar.append(character)
return nil
case .keyboardDeleteBackwards:
searchBar.deleteBackwards()
return nil
case .searchButtonPress:
do {
forecast = try provider.forecast(for: searchBar.text)
return .success(city: searchBar.text, forecast: forecast!)
} catch {
return .failure(city: searchBar.text)
}
}
}
}
```var searchBar: SearchBar // cannot find type 'SearchBar' in scopeinit(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'self.searchBar = SearchBar() // cannot find 'SearchBar' in scope} catch { // 'catch' block is unreachable because no errors are thrown in 'do' blockprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText += String(character)
return nil
case .keyboardDeleteBackwards:
searchBarText = String(searchBarText.dropLast())
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText += String(character)
return nil
case .keyboardDeleteBackwards:
searchBarText = String(searchBarText.dropLast())
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
```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 = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText += String(character)
return nil
case .keyboardDeleteBackwards:
searchText = String(searchText.dropLast())
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
}
}```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 = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchText += String(character)
return nil
case .keyboardDeleteBackwards:
searchText = String(searchText.dropLast())
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return .success(city: searchText, forecast: forecast)
} catch {
return .failure(city: searchText)
}
}
}
}
```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 = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText += String(character)
return nil
case .keyboardDeleteBackwards:
searchBarText = String(searchBarText.dropLast())
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
var searchBarText = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText += String(character)
return nil
case .keyboardDeleteBackwards:
searchBarText = String(searchBarText.dropLast())
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
```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 {
balance += amount
}
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
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
// BankAccount is a thread-safe bank account class that uses an actor to ensure that the account balance remains consistent and transactions are atomic.
//
// The actor is a class that conforms to the BankAccountProtocol protocol.
//
// The actor is a thread-safe class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is a class that can be used from multiple threads simultaneously.
//
// The actor is aprivate var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'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
}
var balance: Double {
get async {
return balance
}
}
func deposit(amount: Double) async {
balance += amount
}
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
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return balance
}
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'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 {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
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
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
var balance: Double {
get async {
return balance
}
}
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'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
}
var balance: Double {
get async {
return balance
}
}
func deposit(amount: Double) async {
balance += amount
}
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
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return balance
}
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
// BankAccount is a thread-safe bank account class that uses an actor to ensure that the account balance remains consistent and transactions are atomic.
//
// The BankAccount class has a balance property that is thread-safe and can be accessed asynchronously.
//
// The deposit and withdraw methods are asynchronous and can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because the actor ensures that the balance is always consistent.
//
// The deposit and withdraw methods are asynchronous because they can be called concurrently.
//
// The balance property is thread-safe because theprivate var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'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 {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
struct BankAccountStruct: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
class BankAccountClass: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
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
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
// BankAccount is a struct that conforms to the BankAccountProtocol protocol.
struct BankAccountStruct: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
// BankAccount is a class that conforms to the BankAccountProtocol protocol.
class BankAccountClass: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'balance += amount // left side of mutating operator isn't mutable: 'self' is immutablebalance -= amount // left side of mutating operator isn't mutable: 'self' is immutableprivate var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccountClass'protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
if _balance >= amount {
_balance -= amount
return true
} else {
return false
}
}
}
func asyncExample() async {
let account = BankAccount(balance: 100)
await account.deposit(amount: 50)
await account.withdraw(amount: 25)
print(await account.balance)
}
func syncExample() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
func syncExample2() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
func syncExample3() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
func syncExample4() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
func syncExample5() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
func syncExample6() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
func syncExample7() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
func syncExample8() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
func syncExample9() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
func syncExample10() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(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
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
if _balance >= amount {
_balance -= amount
return true
} else {
return false
}
}
}
// BankAccount is an actor, so it can be used in asynchronous code.
func asyncExample() async {
let account = BankAccount(balance: 100)
await account.deposit(amount: 50)
await account.withdraw(amount: 25)
print(await account.balance)
}
// BankAccount is a protocol, so it can be used in synchronous code.
func syncExample() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
// BankAccount is a protocol, so it can be used in synchronous code.
func syncExample2() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
// BankAccount is a protocol, so it can be used in synchronous code.
func syncExample3() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
// BankAccount is a protocol, so it can be used in synchronous code.
func syncExample4() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
// BankAccount is a protocol, so it can be used in synchronous code.
func syncExample5() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
// BankAccount is a protocol, so it can be used in synchronous code.
func syncExample6() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
// BankAccount is a protocol, so it can be used in synchronous code.
func syncExample7() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
// BankAccount is a protocol, so it can be used in synchronous code.
func syncExample8() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
// BankAccount is a protocol, so it can be used in synchronous code.
func syncExample9() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
// BankAccount is a protocol, so it can be used in synchronous code.
func syncExample10() {
let account = BankAccount(balance: 100)
account.deposit(amount: 50)
account.withdraw(amount: 25)
print(account.balance)
}
// BankAccount is a protocol, so it can beawait account.withdraw(amount: 25) // result of call to 'withdraw(amount:)' is unusedaccount.deposit(amount: 50) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // result of call to 'withdraw(amount:)' is unusedprint(account.balance) // 'async' property access in a function that does not support concurrencyaccount.deposit(amount: 50) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // result of call to 'withdraw(amount:)' is unusedaccount.withdraw(amount: 25) // 'async' call in a function that does not support concurrencyprint(account.balance) // 'async' property access in a function that does not support concurrencyaccount.deposit(amount: 50) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // result of call to 'withdraw(amount:)' is unusedaccount.withdraw(amount: 25) // 'async' call in a function that does not support concurrencyprint(account.balance) // 'async' property access in a function that does not support concurrencyaccount.deposit(amount: 50) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // result of call to 'withdraw(amount:)' is unusedaccount.withdraw(amount: 25) // 'async' call in a function that does not support concurrencyprint(account.balance) // 'async' property access in a function that does not support concurrencyaccount.deposit(amount: 50) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // result of call to 'withdraw(amount:)' is unusedaccount.withdraw(amount: 25) // 'async' call in a function that does not support concurrencyprint(account.balance) // 'async' property access in a function that does not support concurrencyaccount.deposit(amount: 50) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // result of call to 'withdraw(amount:)' is unusedprint(account.balance) // 'async' property access in a function that does not support concurrencyaccount.deposit(amount: 50) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // result of call to 'withdraw(amount:)' is unusedaccount.withdraw(amount: 25) // 'async' call in a function that does not support concurrencyprint(account.balance) // 'async' property access in a function that does not support concurrencyaccount.deposit(amount: 50) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // result of call to 'withdraw(amount:)' is unusedprint(account.balance) // 'async' property access in a function that does not support concurrencyaccount.deposit(amount: 50) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // result of call to 'withdraw(amount:)' is unusedprint(account.balance) // 'async' property access in a function that does not support concurrencyaccount.deposit(amount: 50) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // 'async' call in a function that does not support concurrencyaccount.withdraw(amount: 25) // result of call to 'withdraw(amount:)' is unusedprint(account.balance) // 'async' property access in a function that does not support concurrencyprotocol 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
}
var balance: Double {
get async {
return balance
}
}
func deposit(amount: Double) async {
balance += amount
}
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
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return balance
}
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'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
}
var balance: Double {
get async {
return balance
}
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else { return false }
balance -= amount
return true
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return balance
}
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard amount <= balance else { return false }
balance -= amount
return true
}
}
// BankAccount is a thread-safe bank account class that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
//
// let account = BankAccount(balance: 100)
// account.deposit(amount: 50)
// account.withdraw(amount: 25)
// account.balance
// account.withdraw(amount: 100)
// account.balance
//
// let account2 = BankAccount(balance: 100)
// await account2.deposit(amount: 50)
// await account2.withdraw(amount: 25)
// await account2.balance
// await account2.withdraw(amount: 100)
// await account2.balance
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'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) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
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
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
if _balance >= amount {
_balance -= amount
return true
} else {
return false
}
}
}
// BankAccount is an actor, so it can be used from any thread.
let bankAccount = BankAccount(balance: 100)
// Deposit $100.
await bankAccount.deposit(amount: 100)
// Withdraw $50.
let withdrawalSuccessful = await bankAccount.withdraw(amount: 50)
// Get the balance.
let balance = await bankAccount.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) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double
init(balance: Double) {
_balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard _balance >= amount else { return false }
_balance -= amount
return true
}
}
// BankAccount is a 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.
//
// public init(balance: Double)
// public var balance: Double { get async }
// public func deposit(amount: Double) async
// public func withdraw(amount: Double) async -> Bool
```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
private var _conditionValueDidChange: Bool
private var _conditionValueDidChangeHandler: (() -> Void)?
var wrappedValue: Value {
if _conditionValueDidChange {
_conditionValueDidChange = false
_conditionValueDidChangeHandler?()
_value = nil
}
if _value == nil {
_value = _wrappedValue()
}
return _value!
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self._wrappedValue = wrappedValue
self._condition = condition
self._conditionValue = condition()
self._conditionValueDidChange = true
}
var projectedValue: Cached<Value> {
return self
}
func didChange(handler: @escaping () -> Void) {
_conditionValueDidChangeHandler = handler
}
private var _wrappedValue: () -> Value
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var _value: Value?
private var _condition: () -> Bool
private var _conditionValue: Bool
private var _conditionValueDidChange: Bool
private var _conditionValueDidChangeHandler: (() -> Void)?
var wrappedValue: Value {
if _conditionValueDidChange {
_conditionValueDidChange = false
_conditionValueDidChangeHandler?()
_value = nil
}
if _value == nil {
_value = _wrappedValue()
}
return _value!
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self._wrappedValue = wrappedValue
self._condition = condition
self._conditionValue = condition()
self._conditionValueDidChange = true
}
var projectedValue: Cached<Value> {
return self
}
func didChange(handler: @escaping () -> Void) {
_conditionValueDidChangeHandler = handler
}
private var _wrappedValue: () -> Value
}
// 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
private var _conditionValueDidChange: Bool
private var _conditionValueDidChangeHandler: (() -> Void)?
var wrappedValue: Value {
if _conditionValueDidChange {
_conditionValueDidChange = false
_conditionValueDidChangeHandler?()
_value = nil
}
if _value == nil {
_value = _wrappedValue()
}
return _value!
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self._wrappedValue = wrappedValue
self._condition = condition
self._conditionValue = condition()
self._conditionValueDidChange = true
}
var projectedValue: Cached<Value> {
return self
}
func didChange(handler: @escaping () -> Void) {
_conditionValueDidChangeHandler = handler
}
private var _wrappedValue: () -> Value
}
```_conditionValueDidChange = false // cannot assign to property: 'self' is immutable_value = nil // cannot assign to property: 'self' is immutable_value = _wrappedValue() // cannot assign to property: 'self' is immutable_conditionValueDidChangeHandler = handler // 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
private var conditionValueChanged: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.conditionValue = condition()
self.conditionValueChanged = true
self.value = nil
self._wrappedValue = {
if self.conditionValueChanged {
self.conditionValue = self.condition()
self.conditionValueChanged = false
self.value = wrappedValue()
}
return self.value!
}
}
var wrappedValue: Value {
get {
return self.wrappedValue
}
set {
self.value = newValue
}
}
var projectedValue: Cached<Value> {
return self
}
var conditionValueChanged: Bool {
get {
return self.conditionValueChanged
}
set {
self.conditionValueChanged = newValue
}
}
var conditionValue: Bool {
get {
return self.conditionValue
}
set {
self.conditionValue = 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
private var conditionValueChanged: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.conditionValue = condition()
self.conditionValueChanged = true
self.value = nil
self._wrappedValue = {
if self.conditionValueChanged {
self.conditionValue = self.condition()
self.conditionValueChanged = false
self.value = wrappedValue()
}
return self.value!
}
}
var wrappedValue: Value {
get {
return self.wrappedValue
}
set {
self.value = newValue
}
}
var projectedValue: Cached<Value> {
return self
}
var conditionValueChanged: Bool {
get {
return self.conditionValueChanged
}
set {
self.conditionValueChanged = newValue
}
}
var conditionValue: Bool {
get {
return self.conditionValue
}
set {
self.conditionValue = newValue
}
}
}
```self._wrappedValue = { // value of type 'Cached<Value>' has no member '_wrappedValue'var conditionValueChanged: Bool { // invalid redeclaration of 'conditionValueChanged'var conditionValue: Bool { // invalid redeclaration of 'conditionValue'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
private var conditionValueChanged: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition
self.conditionValue = condition()
self.conditionValueChanged = false
}
var wrappedValue: Value {
if conditionValueChanged {
value = wrappedValue()
conditionValue = condition()
conditionValueChanged = false
}
return value
}
var projectedValue: Self {
return self
}
func set(newValue: Value) {
value = newValue
conditionValueChanged = 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 var condition: () -> Bool
private var conditionValue: Bool
private var conditionValueChanged: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition
self.conditionValue = condition()
self.conditionValueChanged = false
}
var wrappedValue: Value {
if conditionValueChanged {
value = wrappedValue()
conditionValue = condition()
conditionValueChanged = false
}
return value
}
var projectedValue: Self {
return self
}
func set(newValue: Value) {
value = newValue
conditionValueChanged = true
}
}
```value = wrappedValue() // cannot call value of non-function type 'Value'value = wrappedValue() // cannot assign to property: 'self' is immutableconditionValue = condition() // cannot assign to property: 'self' is immutableconditionValueChanged = false // cannot assign to property: 'self' is immutablevalue = newValue // cannot assign to property: 'self' is immutableconditionValueChanged = true // cannot assign to property: 'self' is immutableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value
}
var value: Value
var condition: () -> Bool
}```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 {
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value
}
var value: Value
var condition: () -> Bool
}
```self.wrappedValue = wrappedValue // function produces expected type 'Value'; did you mean to call it with '()'?self.wrappedValue = wrappedValue // cannot assign to property: 'wrappedValue' is a get-only propertyvalue = wrappedValue() // cannot assign to property: 'self' is immutablevalue = wrappedValue() // cannot call value of non-function type 'Value'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
private var _conditionValueChanged: Bool
private var _conditionValueChangedValue: Bool
private var _conditionValueChangedValueChanged: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
_value = nil
_condition = condition
_conditionValue = condition()
_conditionValueChanged = false
_conditionValueChangedValue = false
_conditionValueChangedValueChanged = false
self.wrappedValue = wrappedValue()
}
var wrappedValue: Value {
get {
if _conditionValueChanged {
_value = nil
_conditionValueChanged = false
}
if _conditionValueChangedValue {
_conditionValue = _condition()
_conditionValueChangedValue = false
}
if _conditionValueChangedValueChanged {
_conditionValueChangedValue = _conditionValueChangedValue
_conditionValueChangedValueChanged = false
}
if _value == nil {
_value = wrappedValue()
}
return _value!
}
set {
_value = newValue
}
}
var projectedValue: Cached<Value> {
return self
}
var condition: () -> Bool {
get {
return _condition
}
set {
_condition = newValue
_conditionValueChangedValue = true
_conditionValueChangedValueChanged = true
}
}
var conditionValue: Bool {
get {
return _conditionValue
}
set {
_conditionValue = newValue
_conditionValueChanged = true
_conditionValueChangedValueChanged = true
}
}
var conditionValueChanged: Bool {
get {
return _conditionValueChanged
}
set {
_conditionValueChanged = newValue
_conditionValueChangedValueChanged = true
}
}
var conditionValueChangedValue: Bool {
get {
return _conditionValueChangedValue
}
set {
_conditionValueChangedValue = newValue
_conditionValueChangedValueChanged = true
}
}
var conditionValueChangedValueChanged: Bool {
get {
return _conditionValueChangedValueChanged
}
set {
_conditionValueChangedValueChanged = 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
private var _conditionValueChanged: Bool
private var _conditionValueChangedValue: Bool
private var _conditionValueChangedValueChanged: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
_value = nil
_condition = condition
_conditionValue = condition()
_conditionValueChanged = false
_conditionValueChangedValue = false
_conditionValueChangedValueChanged = false
self.wrappedValue = wrappedValue()
}
var wrappedValue: Value {
get {
if _conditionValueChanged {
_value = nil
_conditionValueChanged = false
}
if _conditionValueChangedValue {
_conditionValue = _condition()
_conditionValueChangedValue = false
}
if _conditionValueChangedValueChanged {
_conditionValueChangedValue = _conditionValueChangedValue
_conditionValueChangedValueChanged = false
}
if _value == nil {
_value = wrappedValue()
}
return _value!
}
set {
_value = newValue
}
}
var projectedValue: Cached<Value> {
return self
}
var condition: () -> Bool {
get {
return _condition
}
set {
_condition = newValue
_conditionValueChangedValue = true
_conditionValueChangedValueChanged = true
}
}
var conditionValue: Bool {
get {
return _conditionValue
}
set {
_conditionValue = newValue
_conditionValueChanged = true
_conditionValueChangedValueChanged = true
}
}
var conditionValueChanged: Bool {
get {
return _conditionValueChanged
}
set {
_conditionValueChanged = newValue
_conditionValueChangedValueChanged = true
}
}
var conditionValueChangedValue: Bool {
get {
return _conditionValueChangedValue
}
set {
_conditionValueChangedValue = newValue
_conditionValueChangedValueChanged = true
}
}
var conditionValueChangedValueChanged: Bool {
get {
return _conditionValueChangedValueChanged
}
set {
_conditionValueChangedValueChanged = newValue
}
}
}
```_value = nil // cannot assign to property: 'self' is immutable_conditionValueChanged = false // cannot assign to property: 'self' is immutable_conditionValue = _condition() // cannot assign to property: 'self' is immutable_conditionValueChangedValue = false // cannot assign to property: 'self' is immutable_conditionValueChangedValue = _conditionValueChangedValue // cannot assign to property: 'self' is immutable_conditionValueChangedValueChanged = false // cannot assign to property: 'self' is immutable_value = wrappedValue() // cannot call value of non-function type 'Value'_value = wrappedValue() // cannot assign to property: 'self' is immutableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
typealias WrappedValue = Value
private var _wrappedValue: Value?
private var _condition: () -> Bool
private var _conditionValue: Bool
private var _conditionValueDidChange: Bool
var wrappedValue: Value {
if _conditionValueDidChange {
_conditionValueDidChange = false
_wrappedValue = nil
}
if _wrappedValue == nil {
_wrappedValue = _condition() ? value : nil
}
return _wrappedValue!
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self._wrappedValue = nil
self._condition = condition
self._conditionValue = condition()
self._conditionValueDidChange = false
}
var value: Value {
wrappedValue
}
var condition: () -> Bool {
get { _condition }
set {
_condition = newValue
_conditionValueDidChange = true
}
}
var conditionValue: Bool {
get { _conditionValue }
set {
_conditionValue = newValue
_conditionValueDidChange = 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 {
typealias WrappedValue = Value
private var _wrappedValue: Value?
private var _condition: () -> Bool
private var _conditionValue: Bool
private var _conditionValueDidChange: Bool
var wrappedValue: Value {
if _conditionValueDidChange {
_conditionValueDidChange = false
_wrappedValue = nil
}
if _wrappedValue == nil {
_wrappedValue = _condition() ? value : nil
}
return _wrappedValue!
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self._wrappedValue = nil
self._condition = condition
self._conditionValue = condition()
self._conditionValueDidChange = false
}
var value: Value {
wrappedValue
}
var condition: () -> Bool {
get { _condition }
set {
_condition = newValue
_conditionValueDidChange = true
}
}
var conditionValue: Bool {
get { _conditionValue }
set {
_conditionValue = newValue
_conditionValueDidChange = true
}
}
}
```_conditionValueDidChange = false // cannot assign to property: 'self' is immutable_wrappedValue = nil // cannot assign to property: 'self' is immutable_wrappedValue = _condition() ? value : nil // 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
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.conditionValue = condition()
self.wrappedValue = wrappedValue()
}
var wrappedValue: Value {
if condition() != conditionValue {
value = nil
conditionValue = condition()
}
if value == nil {
value = wrappedValue()
}
return value!
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: () -> Bool
private var conditionValue: Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self.conditionValue = condition()
self.wrappedValue = wrappedValue()
}
var wrappedValue: Value {
if condition() != conditionValue {
value = nil
conditionValue = condition()
}
if value == nil {
value = wrappedValue()
}
return value!
}
}
```self.wrappedValue = wrappedValue() // cannot assign to property: 'wrappedValue' is a get-only propertyvalue = nil // cannot assign to property: 'self' is immutableconditionValue = condition() // cannot assign to property: 'self' is immutablevalue = wrappedValue() // cannot call value of non-function type 'Value'value = wrappedValue() // cannot assign to property: 'self' is immutableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}```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
private var conditionValueChanged: Bool
private var conditionValueChangedValue: Bool
private var conditionValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChanged: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValuevar condition = false // variable 'condition' was written to, but never read@Cached(condition: { condition }) // unknown attribute 'Cached'var cached: Int = { // variable 'cached' was never mutated; consider changing to 'let' constantprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var _value: Value?
private var _condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self._value = nil
self._condition = condition
}
var wrappedValue: Value {
if _value == nil || !_condition() {
_value = wrappedValue()
}
return _value!
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var _value: Value?
private var _condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self._value = nil
self._condition = condition
}
var wrappedValue: Value {
if _value == nil || !_condition() {
_value = wrappedValue()
}
return _value!
}
}
```_value = wrappedValue() // cannot call value of non-function type 'Value'_value = wrappedValue() // cannot assign to property: 'self' is immutableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}```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
private var _conditionValueChanged: Bool
private var _conditionValueChangedValue: Bool
private var _conditionValueChangedValueChanged: Bool
private var _conditionValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChanged: Bool
private var _conditionValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValue: Bool
private var _conditionValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedValueChangedvar condition = false // variable 'condition' was written to, but never read@Cached(condition: { condition }) // unknown attribute 'Cached'var cached: Int = { // variable 'cached' was never mutated; consider changing to 'let' constantinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: FunctionApplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}```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: FunctionApplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
// 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).
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
// 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).
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
// 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).
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
// 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).
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
// 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).
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
// 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).
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
// 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).
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
// 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).
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
// 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).
func >>> <A, B, C>(lhs: @escaping (A) -> B,higherThan: FunctionApplicationPrecedence // unknown precedence group 'FunctionApplicationPrecedence'return { lhs($0) |> rhs } // cannot find operator '|>' in scopeinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: BitwiseShiftPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}```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: BitwiseShiftPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
```return { lhs($0) |> rhs } // cannot find operator '|>' in scopeinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: BitwiseShiftPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}```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: BitwiseShiftPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
```return { lhs($0) |> rhs } // cannot find operator '|>' in scopeinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: BitwiseShiftPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}```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: BitwiseShiftPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
// Use the custom infix operator >>> to compose two functions.
let addOne: (Int) -> Int = { $0 + 1 }
let multiplyByTwo: (Int) -> Int = { $0 * 2 }
let multiplyByThree: (Int) -> Int = { $0 * 3 }
let addOneThenMultiplyByTwo: (Int) -> Int = addOne >>> multiplyByTwo
let multiplyByTwoThenMultiplyByThree: (Int) -> Int = multiplyByTwo >>> multiplyByThree
addOneThenMultiplyByTwo(1) // 3
multiplyByTwoThenMultiplyByThree(1) // 6
```return { lhs($0) |> rhs } // cannot find operator '|>' in scopeinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: BitwiseShiftPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { f($0) |> g }
}```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: BitwiseShiftPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { f($0) |> g }
}
```return { f($0) |> g } // cannot find operator '|>' in scopeinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { f($0) |> g }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { f($0) |> g }
}
// Use the custom infix operator >>> to compose two functions.
let addOne: (Int) -> Int = { $0 + 1 }
let multiplyByTwo: (Int) -> Int = { $0 * 2 }
let addOneAndMultiplyByTwo: (Int) -> Int = addOne >>> multiplyByTwo
addOneAndMultiplyByTwo(1) // 4
```return { f($0) |> g } // cannot find operator '|>' in scopeinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
```return { lhs($0) |> rhs } // cannot find operator '|>' in scopeinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: BitwiseShiftPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { f($0) |> g }
}
func addOne(_ x: Int) -> Int {
return x + 1
}
func multiplyByTwo(_ 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: BitwiseShiftPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { f($0) |> g }
}
// Example of using the custom infix operator >>> to compose two functions.
func addOne(_ x: Int) -> Int {
return x + 1
}
func multiplyByTwo(_ x: Int) -> Int {
return x * 2
}
let addOneAndMultiplyByTwo: (Int) -> Int = addOne >>> multiplyByTwo
addOneAndMultiplyByTwo(1) // 3
```return { f($0) |> g } // cannot find operator '|>' in scopeinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: BitwiseShiftPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}```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: BitwiseShiftPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { lhs($0) |> rhs }
}
```return { lhs($0) |> rhs } // cannot find operator '|>' in scopeinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: BitwiseShiftPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { f($0) |> g }
}```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: BitwiseShiftPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { f($0) |> g }
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { f($0) |> g }
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { f($0) |> g }
}
```return { f($0) |> g } // cannot find operator '|>' in scopeimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: 1)
defer { buffer.deallocate() }
var hasher = SHA256()
inputStream.open()
defer { inputStream.close() }
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer.bindMemory(to: UInt8.self).baseAddress!, maxLength: bufferSize)
hasher.update(buffer.baseAddress!, byteCount: read)
}
return hasher.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: 1)
defer { buffer.deallocate() }
var hasher = SHA256()
inputStream.open()
defer { inputStream.close() }
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer.bindMemory(to: UInt8.self).baseAddress!, maxLength: bufferSize)
hasher.update(buffer.baseAddress!, byteCount: read)
}
return hasher.finalize()
}
```hasher.update(buffer.baseAddress!, byteCount: read) // cannot convert value of type 'UnsafeMutableRawPointer' to expected argument type 'UnsafeRawBufferPointer'hasher.update(buffer.baseAddress!, byteCount: read) // extra argument 'byteCount' in callimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hasher = SHA256()
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: 1)
defer {
buffer.deallocate()
}
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer)
if read > 0 {
hasher.update(buffer.bindMemory(to: UInt8.self).baseAddress!, byteCount: read)
}
}
return hasher.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hasher = SHA256()
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: 1)
defer {
buffer.deallocate()
}
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer)
if read > 0 {
hasher.update(buffer.bindMemory(to: UInt8.self).baseAddress!, byteCount: read)
}
}
return hasher.finalize()
}
```let read = inputStream.read(buffer) // missing argument for parameter 'maxLength' in calllet read = inputStream.read(buffer) // cannot convert value of type 'UnsafeMutableRawBufferPointer' to expected argument type 'UnsafeMutablePointer<UInt8>'hasher.update(buffer.bindMemory(to: UInt8.self).baseAddress!, byteCount: read) // cannot convert value of type 'UnsafeMutablePointer<UInt8>' to expected argument type 'UnsafeRawBufferPointer'hasher.update(buffer.bindMemory(to: UInt8.self).baseAddress!, byteCount: read) // extra argument 'byteCount' in callimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var data = Data()
inputStream.open()
defer { inputStream.close() }
while inputStream.hasBytesAvailable {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
let readBytes = inputStream.read(buffer, maxLength: bufferSize)
buffer.withMemoryRebound(to: UInt8.self, capacity: readBytes) {
data.append(contentsOf: $0, count: readBytes)
}
buffer.deallocate()
}
return SHA256Hash.hash(data: data)
}
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var data = Data()
inputStream.open()
defer { inputStream.close() }
while inputStream.hasBytesAvailable {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
let readBytes = inputStream.read(buffer, maxLength: bufferSize)
buffer.withMemoryRebound(to: UInt8.self, capacity: readBytes) {
data.append(contentsOf: $0, count: readBytes)
}
buffer.deallocate()
}
return SHA256(data: data).hash
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var data = Data()
inputStream.open()
defer { inputStream.close() }
while inputStream.hasBytesAvailable {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
let readBytes = inputStream.read(buffer, maxLength: bufferSize)
buffer.withMemoryRebound(to: UInt8.self, capacity: readBytes) {
data.append(contentsOf: $0, count: readBytes)
}
buffer.deallocate()
}
return SHA256Hash.hash(data: data)
}
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using the OpenSSL framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var data = Data()
inputStream.open()
defer { inputStream.close() }
while inputStream.hasBytesAvailable {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
let readBytes = inputStream.read(buffer, maxLength: bufferSize)
buffer.withMemoryRebound(to: UInt8.self, capacity: readBytes) {
data.append(contentsOf: $0, count: readBytes)
}
buffer.deallocate()
}
return SHA256(data: data).hash
}
```data.append(contentsOf: $0, count: readBytes) // extraneous argument label 'contentsOf:' in callreturn SHA256Hash.hash(data: data) // cannot find 'SHA256Hash' in scopefunc computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest { // invalid redeclaration of 'computeSHA256Hash(of:bufferSize:)'data.append(contentsOf: $0, count: readBytes) // extraneous argument label 'contentsOf:' in callreturn SHA256(data: data).hash // generic parameter 'D' could not be inferredreturn SHA256(data: data).hash // cannot convert return expression of type '(D) -> SHA256.Digest' (aka '(D) -> SHA256Digest') to return type 'SHA256Digest'return SHA256(data: data).hash // argument passed to call that takes no argumentsreturn SHA256(data: data).hash // static member 'hash' cannot be used on instance of type 'SHA256'import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hasher = SHA256()
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer {
buffer.deallocate()
}
while inputStream.hasBytesAvailable {
let readBytes = inputStream.read(buffer, maxLength: bufferSize)
hasher.update(buffer[0..<readBytes])
}
return hasher.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hasher = SHA256()
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer {
buffer.deallocate()
}
while inputStream.hasBytesAvailable {
let readBytes = inputStream.read(buffer, maxLength: bufferSize)
hasher.update(buffer[0..<readBytes])
}
return hasher.finalize()
}
```hasher.update(buffer[0..<readBytes]) // missing argument label 'bufferPointer:' in callhasher.update(buffer[0..<readBytes]) // cannot convert value of type 'Range<Int>' to expected argument type 'Int'hasher.update(buffer[0..<readBytes]) // cannot convert value of type 'UInt8' to expected argument type 'UnsafeRawBufferPointer'import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hasher = SHA256()
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: 1)
defer {
buffer.deallocate()
}
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer)
hasher.update(buffer.prefix(read))
}
return hasher.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hasher = SHA256()
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: 1)
defer {
buffer.deallocate()
}
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer)
hasher.update(buffer.prefix(read))
}
return hasher.finalize()
}
```let read = inputStream.read(buffer) // missing argument for parameter 'maxLength' in calllet read = inputStream.read(buffer) // cannot convert value of type 'UnsafeMutableRawBufferPointer' to expected argument type 'UnsafeMutablePointer<UInt8>'hasher.update(buffer.prefix(read)) // no exact matches in call to instance method 'update'hasher.update(buffer.prefix(read)) // missing argument label 'while:' in callimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var buffer = Data(repeating: 0, count: bufferSize)
var hasher = SHA256()
inputStream.open()
defer { inputStream.close() }
while inputStream.hasBytesAvailable {
let read = inputStream.read(&buffer, maxLength: bufferSize)
hasher.update(buffer.prefix(read))
}
return hasher.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var buffer = Data(repeating: 0, count: bufferSize)
var hasher = SHA256()
inputStream.open()
defer { inputStream.close() }
while inputStream.hasBytesAvailable {
let read = inputStream.read(&buffer, maxLength: bufferSize)
hasher.update(buffer.prefix(read))
}
return hasher.finalize()
}
```hasher.update(buffer.prefix(read)) // missing argument label 'data:' in callimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var hasher = SHA256()
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer, maxLength: bufferSize)
hasher.update(buffer, count: read)
}
return hasher.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var hasher = SHA256()
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer, maxLength: bufferSize)
hasher.update(buffer, count: read)
}
return hasher.finalize()
}
```hasher.update(buffer, count: read) // cannot convert value of type 'UnsafeMutablePointer<UInt8>' to expected argument type 'UnsafeRawBufferPointer'hasher.update(buffer, count: read) // extra argument 'count' in callimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hasher = SHA256()
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: 1)
defer {
buffer.deallocate()
}
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer)
hasher.update(buffer.bindMemory(to: UInt8.self).prefix(read))
}
return hasher.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hasher = SHA256()
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: 1)
defer {
buffer.deallocate()
}
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer)
hasher.update(buffer.bindMemory(to: UInt8.self).prefix(read))
}
return hasher.finalize()
}
```let read = inputStream.read(buffer) // missing argument for parameter 'maxLength' in calllet read = inputStream.read(buffer) // cannot convert value of type 'UnsafeMutableRawBufferPointer' to expected argument type 'UnsafeMutablePointer<UInt8>'hasher.update(buffer.bindMemory(to: UInt8.self).prefix(read)) // no exact matches in call to instance method 'update'hasher.update(buffer.bindMemory(to: UInt8.self).prefix(read)) // missing argument label 'while:' in callimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: 1)
defer { buffer.deallocate() }
var hasher = SHA256()
inputStream.open()
defer { inputStream.close() }
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer.bindMemory(to: UInt8.self).baseAddress!, maxLength: bufferSize)
hasher.update(buffer.prefix(read))
}
return hasher.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: bufferSize, alignment: 1)
defer { buffer.deallocate() }
var hasher = SHA256()
inputStream.open()
defer { inputStream.close() }
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer.bindMemory(to: UInt8.self).baseAddress!, maxLength: bufferSize)
hasher.update(buffer.prefix(read))
}
return hasher.finalize()
}
```hasher.update(buffer.prefix(read)) // missing argument label 'bufferPointer:' in callimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var hasher = SHA256()
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer, maxLength: bufferSize)
hasher.update(buffer, count: read)
}
return hasher.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var hasher = SHA256()
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer, maxLength: bufferSize)
hasher.update(buffer, count: read)
}
return hasher.finalize()
}
```hasher.update(buffer, count: read) // cannot convert value of type 'UnsafeMutablePointer<UInt8>' to expected argument type 'UnsafeRawBufferPointer'hasher.update(buffer, count: read) // extra argument 'count' in calltypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(tuple16.0)
self.append(String(tuple16.1))
self.append(String(tuple16.2))
self.append(String(tuple16.3))
self.append(String(tuple16.4))
self.append(String(tuple16.5))
self.append(String(tuple16.6))
self.append(String(tuple16.7))
self.append(String(tuple16.8))
self.append(String(tuple16.9))
self.append(String(tuple16.10))
self.append(String(tuple16.11))
self.append(String(tuple16.12))
self.append(String(tuple16.13))
self.append(String(tuple16.14))
self.append(String(tuple16.15))
self.append(String(tuple16.16))
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
self.init(tuple16.0)
self.append(String(tuple16.1))
self.append(String(tuple16.2))
self.append(String(tuple16.3))
self.append(String(tuple16.4))
self.append(String(tuple16.5))
self.append(String(tuple16.6))
self.append(String(tuple16.7))
self.append(String(tuple16.8))
self.append(String(tuple16.9))
self.append(String(tuple16.10))
self.append(String(tuple16.11))
self.append(String(tuple16.12))
self.append(String(tuple16.13))
self.append(String(tuple16.14))
self.append(String(tuple16.15))
self.append(String(tuple16.16))
}
}
```self.append(String(tuple16.16)) // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member '16'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(cString: tuple16)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
self.init(cString: tuple16)
}
}
```self.init(cString: tuple16) // no exact matches in call to initializertypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(cString: tuple16)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
self.init(cString: tuple16)
}
}
```self.init(cString: tuple16) // no exact matches in call to initializertypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(tuple16: tuple16, encoding: .ascii)
}
init(tuple16: Tuple16, encoding: String.Encoding) {
let bytes = tuple16.withUnsafeBufferPointer {
UnsafeBufferPointer<UInt8>(start: $0.baseAddress, count: 16)
}
guard let string = String(bytes: bytes, encoding: encoding) else {
fatalError("Unable to decode string from tuple16")
}
self = string
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
self.init(tuple16: tuple16, encoding: .ascii)
}
init(tuple16: Tuple16, encoding: String.Encoding) {
let bytes = tuple16.withUnsafeBufferPointer {
UnsafeBufferPointer<UInt8>(start: $0.baseAddress, count: 16)
}
guard let string = String(bytes: bytes, encoding: encoding) else {
fatalError("Unable to decode string from tuple16")
}
self = string
}
}
```let bytes = tuple16.withUnsafeBufferPointer { // 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 'withUnsafeBufferPointer'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(cString: tuple16)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
self.init(cString: tuple16)
}
}
```self.init(cString: tuple16) // no exact matches in call to initializertypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(tuple16: tuple16, encoding: .ascii)
}
init(tuple16: Tuple16, encoding: String.Encoding) {
let tuple = tuple16.map { Int8(bitPattern: $0) }
guard let data = Data(bytes: tuple, count: tuple.count) else {
fatalError("Could not convert tuple to data")
}
guard let string = String(data: data, encoding: encoding) else {
fatalError("Could not convert data to string")
}
self = string
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
self.init(tuple16: tuple16, encoding: .ascii)
}
init(tuple16: Tuple16, encoding: String.Encoding) {
let tuple = tuple16.map { Int8(bitPattern: $0) }
guard let data = Data(bytes: tuple, count: tuple.count) else {
fatalError("Could not convert tuple to data")
}
guard let string = String(data: data, encoding: encoding) else {
fatalError("Could not convert data to string")
}
self = string
}
}
```let tuple = tuple16.map { Int8(bitPattern: $0) } // 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 'map'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(cString: tuple16)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
self.init(cString: tuple16)
}
}
```self.init(cString: tuple16) // no exact matches in call to initializertypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self = String(cString: tuple16)
}
}
extension Tuple16 {
init(string: String) {
self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 })
}
}
extension Tuple16 {
init(string: String, paddingCharacter: Character) {
self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 })
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
self = String(cString: tuple16)
}
}
// Extension to the Tuple16 type that allows initializing a Tuple16 from a String, where the String represents a C-style null-terminated string.
extension Tuple16 {
init(string: String) {
self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 })
}
}
// Extension to the Tuple16 type that allows initializing a Tuple16 from a String, where the String represents a C-style null-terminated string, and the String is padded to 16 characters with the given character.
extension Tuple16 {
init(string: String, paddingCharacter: Character) {
self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 })
}
}
```self = String(cString: tuple16) // no exact matches in call to initializerextension Tuple16 { // tuple extensions are experimentalextension Tuple16 { // tuple extension must be written as extension of '(repeat each Element)'extension Tuple16 { // tuple extension must declare conformance to exactly one protocolself = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '7'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '3'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '12'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '15'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '1'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '13'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '6'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '9'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '8'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '0'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '2'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // cannot assign value of type '(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _)' to type '(repeat each Element)'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '11'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // pack expansion requires that '_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _' and 'each Element' have the same shapeself = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '14'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '4'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '5'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '10'extension Tuple16 { // tuple extensions are experimentalextension Tuple16 { // tuple extension must declare conformance to exactly one protocolextension Tuple16 { // tuple extension must be written as extension of '(repeat each Element)'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '0'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '4'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '10'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '2'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '11'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '6'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '5'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '7'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '1'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '9'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '12'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '15'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '8'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '3'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // cannot assign value of type '(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _)' to type '(repeat each Element)'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // pack expansion requires that '_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _' and 'each Element' have the same shapeself = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '13'self = (string.withCString { $0.0 }, string.withCString { $0.1 }, string.withCString { $0.2 }, string.withCString { $0.3 }, string.withCString { $0.4 }, string.withCString { $0.5 }, string.withCString { $0.6 }, string.withCString { $0.7 }, string.withCString { $0.8 }, string.withCString { $0.9 }, string.withCString { $0.10 }, string.withCString { $0.11 }, string.withCString { $0.12 }, string.withCString { $0.13 }, string.withCString { $0.14 }, string.withCString { $0.15 }) // value of type 'UnsafePointer<Int8>' has no member '14'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(tuple16: tuple16, encoding: .ascii)
}
init(tuple16: Tuple16, encoding: String.Encoding) {
let bytes = tuple16.map { Int8($0) }
guard let string = String(bytes: bytes, encoding: encoding) else {
preconditionFailure("Could not decode string from tuple16")
}
self = string
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
self.init(tuple16: tuple16, encoding: .ascii)
}
init(tuple16: Tuple16, encoding: String.Encoding) {
let bytes = tuple16.map { Int8($0) }
guard let string = String(bytes: bytes, encoding: encoding) else {
preconditionFailure("Could not decode string from tuple16")
}
self = string
}
}
```let bytes = tuple16.map { Int8($0) } // 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 'map'typealias 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)
}
}
extension Tuple16 {
init(_ string: String) {
self = (Int8(string.utf8.first!), Int8(string.utf8.dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!))
}
}```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)
}
}
// Extension to the Tuple16 type that allows initializing a Tuple16 from a String.
extension Tuple16 {
init(_ string: String) {
self = (Int8(string.utf8.first!), Int8(string.utf8.dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!))
}
}
// Extension to the Tuple16 type that allows initializing a Tuple16 from a String.
extension Tuple16 {
init(_ string: String) {
self = (Int8(string.utf8.first!), Int8(string.utf8.dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirstself = String(cString: tuple16) // no exact matches in call to initializerextension Tuple16 { // tuple extensions are experimentalextension Tuple16 { // tuple extension must be written as extension of '(repeat each Element)'extension Tuple16 { // tuple extension must declare conformance to exactly one protocolself = (Int8(string.utf8.first!), Int8(string.utf8.dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!)) // cannot assign value of type '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)' to type '(repeat each Element)'self = (Int8(string.utf8.first!), Int8(string.utf8.dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!), Int8(string.utf8.dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().dropFirst().first!)) // pack expansion requires that 'Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8' and 'each Element' have the same shapeimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) && CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs)
}
func ~!=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~= rhs)
}
func ~==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) && CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) && CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs)
}
func ~!=!(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~== rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, but not equal in pixel format or content.
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) && CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, but equal in pixel format and content.
func ~!=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~= rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size and pixel format, but not equal in content.
func ~==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) && CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) && CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size or pixel format, but equal in content.
func ~!=!(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~== rhs)
}
```return CVPixelBufferIsEqual(lhs, rhs) // cannot find 'CVPixelBufferIsEqual' in scopefunc ~!=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationfunc ~==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationfunc ~!=!(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationreturn !(lhs ~== rhs) // operator is not a known binary operatorimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
```return CVPixelBufferIsEqual(lhs, rhs) // cannot find 'CVPixelBufferIsEqual' in scopeimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs)
}
func ≠=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~= rhs)
}
func ≡=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs)
}
func ≢(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ≡= rhs)
}
func ≨(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs)
}
func ≦(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ≨ rhs)
}
func ≨=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs)
}
func ≦=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ≨= rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, but not equal in pixel format or content.
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, but equal in pixel format and content.
func ≠=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ~= rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size and pixel format, but not equal in content.
func ≡=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ≢(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ≡= rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size and pixel format, but not equal in content.
func ≨(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ≦(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ≨ rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size and pixel format, but not equal in content.
func ≨=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func ≦=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs ≨= rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size and pixel format, but not equal in content.
func ≦=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
return CVPixelBufferIsEqual(lhs, rhs) // cannot find 'CVPixelBufferIsEqual' in scopefunc ≠=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationfunc ≡=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationfunc ≢(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationreturn !(lhs ≡= rhs) // operator is not a known binary operatorfunc ≨(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationfunc ≦(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationreturn !(lhs ≨ rhs) // operator is not a known binary operatorfunc ≨=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationfunc ≦=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // operator implementation without matching operator declarationreturn !(lhs ≨= rhs) // operator is not a known binary operatorimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
```return CVPixelBufferIsEqual(lhs, rhs) // cannot find 'CVPixelBufferIsEqual' in scopeimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
func ==(lhs: CMTime, rhs: CMTime) -> Bool {
return CMTimeCompare(lhs, rhs) == 0
}
func ==(lhs: CMTimeRange, rhs: CMTimeRange) -> Bool {
return CMTimeRangeEqual(lhs, rhs)
}
func ==(lhs: CMTimeIntervalRange, rhs: CMTimeIntervalRange) -> Bool {
return CMTimeRangeEqual(lhs, rhs)
}
func ==(lhs: CMTimeMapping, rhs: CMTimeMapping) -> Bool {
return CMTimeMappingEqual(lhs, rhs)
}
func ==(lhs: CMTimebase, rhs: CMTimebase) -> Bool {
return CMTimebaseEqual(lhs, rhs)
}
func ==(lhs: CMTimebaseMultiplier, rhs: CMTimebaseMultiplier) -> Bool {
return CMTimebaseMultiplierEqual(lhs, rhs)
}
func ==(lhs: CMTimebaseObserver, rhs: CMTimebaseObserver) -> Bool {
return CMTimebaseObserverEqual(lhs, rhs)
}
func ==(lhs: CMTimebaseObserverToken, rhs: CMTimebaseObserverToken) -> Bool {
return CMTimebaseObserverTokenEqual(lhs, rhs)
}
func ==(lhs: CMTimebaseObserverCallback, rhs: CMTimebaseObserverCallback) -> Bool {
return CMTimebaseObserverCallbackEqual(lhs, rhs)
}
func ==(lhs: CMTimebaseObserverContext, rhs: CMTimebaseObserverContext) -> Bool {
return CMTimebaseObserverContextEqual(lhs, rhs)
}
func ==(lhs: CMTimebaseObserverRef, rhs: CMTimebaseObserverRef) -> Bool {
return CMTimebaseObserverRefEqual(lhs, rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTime objects and returns true if two times are equal.
func ==(lhs: CMTime, rhs: CMTime) -> Bool {
return CMTimeCompare(lhs, rhs) == 0
}
// Custom operator which provides comparison for two CMTimeRange objects and returns true if two time ranges are equal.
func ==(lhs: CMTimeRange, rhs: CMTimeRange) -> Bool {
return CMTimeRangeEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTimeIntervalRange objects and returns true if two time intervals are equal.
func ==(lhs: CMTimeIntervalRange, rhs: CMTimeIntervalRange) -> Bool {
return CMTimeRangeEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTimeMapping objects and returns true if two time mappings are equal.
func ==(lhs: CMTimeMapping, rhs: CMTimeMapping) -> Bool {
return CMTimeMappingEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTimebase objects and returns true if two timebases are equal.
func ==(lhs: CMTimebase, rhs: CMTimebase) -> Bool {
return CMTimebaseEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTimebaseMultiplier objects and returns true if two timebase multipliers are equal.
func ==(lhs: CMTimebaseMultiplier, rhs: CMTimebaseMultiplier) -> Bool {
return CMTimebaseMultiplierEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTimebaseObserver objects and returns true if two timebase observers are equal.
func ==(lhs: CMTimebaseObserver, rhs: CMTimebaseObserver) -> Bool {
return CMTimebaseObserverEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTimebaseObserverToken objects and returns true if two timebase observer tokens are equal.
func ==(lhs: CMTimebaseObserverToken, rhs: CMTimebaseObserverToken) -> Bool {
return CMTimebaseObserverTokenEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTimebaseObserverCallback objects and returns true if two timebase observer callbacks are equal.
func ==(lhs: CMTimebaseObserverCallback, rhs: CMTimebaseObserverCallback) -> Bool {
return CMTimebaseObserverCallbackEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTimebaseObserverContext objects and returns true if two timebase observer contexts are equal.
func ==(lhs: CMTimebaseObserverContext, rhs: CMTimebaseObserverContext) -> Bool {
return CMTimebaseObserverContextEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTimebaseObserverRef objects and returns true if two timebase observer references are equal.
func ==(lhs: CMTimebaseObserverRef, rhs: CMTimebaseObserverRef) -> Bool {
return CMTimebaseObserverRefEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTimebaseObserverToken objects and returns true if two timebase observer tokens are equal.
func ==(lhs: CMTimebaseObserverToken, rhs: CMTimebaseObserverToken) -> Bool {
return CMTimebaseObserverTokenEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTimebaseObserverCallback objects and returns true if two timebase observer callbacks are equal.
func ==(lhs: CMTimebaseObserverCallback, rhs: CMTimebaseObserverCallback) -> Bool {
return CMTimebaseObserverCallbackEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTimebaseObserverContext objects and returns true if two timebase observer contexts are equal.
func ==(lhs: CMTimebaseObserverContext, rhs: CMTimebaseObserverContext) -> Bool {
return CMTimebaseObserverContextEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CMTimebaseObserverRef objects and returns true if two timebase observer references arereturn CVPixelBufferIsEqual(lhs, rhs) // cannot find 'CVPixelBufferIsEqual' in scopefunc ==(lhs: CMTime, rhs: CMTime) -> Bool { // cannot find type 'CMTime' in scopefunc ==(lhs: CMTime, rhs: CMTime) -> Bool { // cannot find type 'CMTime' in scopereturn CMTimeCompare(lhs, rhs) == 0 // cannot find 'CMTimeCompare' in scopefunc ==(lhs: CMTimeRange, rhs: CMTimeRange) -> Bool { // cannot find type 'CMTimeRange' in scopefunc ==(lhs: CMTimeRange, rhs: CMTimeRange) -> Bool { // cannot find type 'CMTimeRange' in scopereturn CMTimeRangeEqual(lhs, rhs) // cannot find 'CMTimeRangeEqual' in scopefunc ==(lhs: CMTimeIntervalRange, rhs: CMTimeIntervalRange) -> Bool { // cannot find type 'CMTimeIntervalRange' in scopefunc ==(lhs: CMTimeIntervalRange, rhs: CMTimeIntervalRange) -> Bool { // cannot find type 'CMTimeIntervalRange' in scopereturn CMTimeRangeEqual(lhs, rhs) // cannot find 'CMTimeRangeEqual' in scopefunc ==(lhs: CMTimeMapping, rhs: CMTimeMapping) -> Bool { // cannot find type 'CMTimeMapping' in scopefunc ==(lhs: CMTimeMapping, rhs: CMTimeMapping) -> Bool { // cannot find type 'CMTimeMapping' in scopereturn CMTimeMappingEqual(lhs, rhs) // cannot find 'CMTimeMappingEqual' in scopefunc ==(lhs: CMTimebase, rhs: CMTimebase) -> Bool { // cannot find type 'CMTimebase' in scopefunc ==(lhs: CMTimebase, rhs: CMTimebase) -> Bool { // cannot find type 'CMTimebase' in scopereturn CMTimebaseEqual(lhs, rhs) // cannot find 'CMTimebaseEqual' in scopefunc ==(lhs: CMTimebaseMultiplier, rhs: CMTimebaseMultiplier) -> Bool { // cannot find type 'CMTimebaseMultiplier' in scopefunc ==(lhs: CMTimebaseMultiplier, rhs: CMTimebaseMultiplier) -> Bool { // cannot find type 'CMTimebaseMultiplier' in scopereturn CMTimebaseMultiplierEqual(lhs, rhs) // cannot find 'CMTimebaseMultiplierEqual' in scopefunc ==(lhs: CMTimebaseObserver, rhs: CMTimebaseObserver) -> Bool { // cannot find type 'CMTimebaseObserver' in scopefunc ==(lhs: CMTimebaseObserver, rhs: CMTimebaseObserver) -> Bool { // cannot find type 'CMTimebaseObserver' in scopereturn CMTimebaseObserverEqual(lhs, rhs) // cannot find 'CMTimebaseObserverEqual' in scopefunc ==(lhs: CMTimebaseObserverToken, rhs: CMTimebaseObserverToken) -> Bool { // cannot find type 'CMTimebaseObserverToken' in scopefunc ==(lhs: CMTimebaseObserverToken, rhs: CMTimebaseObserverToken) -> Bool { // cannot find type 'CMTimebaseObserverToken' in scopereturn CMTimebaseObserverTokenEqual(lhs, rhs) // cannot find 'CMTimebaseObserverTokenEqual' in scopefunc ==(lhs: CMTimebaseObserverCallback, rhs: CMTimebaseObserverCallback) -> Bool { // cannot find type 'CMTimebaseObserverCallback' in scopefunc ==(lhs: CMTimebaseObserverCallback, rhs: CMTimebaseObserverCallback) -> Bool { // cannot find type 'CMTimebaseObserverCallback' in scopereturn CMTimebaseObserverCallbackEqual(lhs, rhs) // cannot find 'CMTimebaseObserverCallbackEqual' in scopefunc ==(lhs: CMTimebaseObserverContext, rhs: CMTimebaseObserverContext) -> Bool { // cannot find type 'CMTimebaseObserverContext' in scopefunc ==(lhs: CMTimebaseObserverContext, rhs: CMTimebaseObserverContext) -> Bool { // cannot find type 'CMTimebaseObserverContext' in scopereturn CMTimebaseObserverContextEqual(lhs, rhs) // cannot find 'CMTimebaseObserverContextEqual' in scopefunc ==(lhs: CMTimebaseObserverRef, rhs: CMTimebaseObserverRef) -> Bool { // cannot find type 'CMTimebaseObserverRef' in scopefunc ==(lhs: CMTimebaseObserverRef, rhs: CMTimebaseObserverRef) -> Bool { // cannot find type 'CMTimebaseObserverRef' in scopereturn CMTimebaseObserverRefEqual(lhs, rhs) // cannot find 'CMTimebaseObserverRefEqual' in scopeimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
```return CVPixelBufferIsEqual(lhs, rhs) // cannot find 'CVPixelBufferIsEqual' in scopeimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) && CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs)
}
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) && CVPixelBufferIsEqual(lhs, rhs)
}
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) && CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) && CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs)
}
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, but not equal in pixel format or content.
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) && CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, but equal in pixel format and content.
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) && CVPixelBufferIsEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size and pixel format, but not equal in content.
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) && CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) && CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, pixel format, and content.
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
```return CVPixelBufferIsEqual(lhs, rhs) // cannot find 'CVPixelBufferIsEqual' in scopefunc ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // invalid redeclaration of '~='return CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) && CVPixelBufferIsEqual(lhs, rhs) // cannot find 'CVPixelBufferIsEqual' in scopefunc ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // invalid redeclaration of '~='func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool { // invalid redeclaration of '~='return CVPixelBufferIsEqual(lhs, rhs) // cannot find 'CVPixelBufferIsEqual' in scopeimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferCompare(lhs, rhs) == kCVReturnSuccess
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(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 CVPixelBufferCompare(lhs, rhs) == kCVReturnSuccess
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are equal in size, but not equal in pixel format or content.
func ~=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs)
}
```return CVPixelBufferCompare(lhs, rhs) == kCVReturnSuccess // cannot find 'CVPixelBufferCompare' in scopeimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
```return CVPixelBufferIsEqual(lhs, rhs) // cannot find 'CVPixelBufferIsEqual' in scopeimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferIsEqual(lhs, rhs)
}
// 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 == rhs)
}
```return CVPixelBufferIsEqual(lhs, rhs) // cannot find 'CVPixelBufferIsEqual' in scopestruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer {
return $0.baseAddress!.bindMemory(to: PublicItem.self, capacity: $0.count)
}
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer {
return $0.baseAddress!.bindMemory(to: PublicItem.self, capacity: $0.count)
}
}
let items = [PrivateItem(value: 1), PrivateItem(value: 2)]
let revealed = reveal(items: items)
print(revealed)
// [PublicItem(value: 1), PublicItem(value: 2)]
```return $0.baseAddress!.bindMemory(to: PublicItem.self, capacity: $0.count) // value of type 'UnsafePointer<PrivateItem>' has no member 'bindMemory'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let memory = UnsafeMutableRawPointer.allocate(byteCount: count * MemoryLayout<PrivateItem>.size, alignment: MemoryLayout<PrivateItem>.alignment)
defer { memory.deallocate() }
let pointer = memory.bindMemory(to: PrivateItem.self, capacity: count)
pointer.initialize(from: items)
return pointer.reinterpretCast(to: PublicItem.self, count: count)
}
func reveal(items: [PublicItem]) -> [PublicItem] {
let count = items.count
let memory = UnsafeMutableRawPointer.allocate(byteCount: count * MemoryLayout<PublicItem>.size, alignment: MemoryLayout<PublicItem>.alignment)
defer { memory.deallocate() }
let pointer = memory.bindMemory(to: PublicItem.self, capacity: count)
pointer.initialize(from: items)
return pointer.reinterpretCast(to: PublicItem.self, count: count)
}
func reveal(items: [PublicItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
func reveal(items: [PrivateItem]) -> [PrivateItem] {
return items.map { PrivateItem(value: $0.value) }
}
func reveal(items: [PublicItem]) -> [PrivateItem] {
return items.map { PrivateItem(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 count = items.count
let memory = UnsafeMutableRawPointer.allocate(byteCount: count * MemoryLayout<PrivateItem>.size, alignment: MemoryLayout<PrivateItem>.alignment)
defer { memory.deallocate() }
let pointer = memory.bindMemory(to: PrivateItem.self, capacity: count)
pointer.initialize(from: items)
return pointer.reinterpretCast(to: PublicItem.self, count: count)
}
// Function to convert an array of structs with public 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: [PublicItem]) -> [PublicItem] {
let count = items.count
let memory = UnsafeMutableRawPointer.allocate(byteCount: count * MemoryLayout<PublicItem>.size, alignment: MemoryLayout<PublicItem>.alignment)
defer { memory.deallocate() }
let pointer = memory.bindMemory(to: PublicItem.self, capacity: count)
pointer.initialize(from: items)
return pointer.reinterpretCast(to: PublicItem.self, count: count)
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying the memory.
func reveal(items: [PublicItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying the memory.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying the memory.
func reveal(items: [PrivateItem]) -> [PrivateItem] {
return items.map { PrivateItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying the memory.
func reveal(items: [PublicItem]) -> [PrivateItem] {
return items.map { PrivateItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying the memory.
func reveal(items: [PrivateItem]) -> [PrivateItem] {
return items.map { PrivateItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying the memory.
func reveal(items: [PublicItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying the memory.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying the memory.
func reveal(items: [PublicItem]) -> [PrivateItem] {
return items.map { PrivateItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying the memory.
func reveal(items: [PrivateItem]) -> [PrivateItem] {
return items.map { PrivateItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying the memory.
func reveal(items: [PublicItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying the memory.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { PublicItempointer.initialize(from: items) // 'initialize(from:)' is unavailable: it will be removed in Swift 5.0. Please use 'UnsafeMutableBufferPointer.initialize(from:)' insteadreturn pointer.reinterpretCast(to: PublicItem.self, count: count) // value of type 'UnsafeMutablePointer<PrivateItem>' has no member 'reinterpretCast'pointer.initialize(from: items) // 'initialize(from:)' is unavailable: it will be removed in Swift 5.0. Please use 'UnsafeMutableBufferPointer.initialize(from:)' insteadreturn pointer.reinterpretCast(to: PublicItem.self, count: count) // value of type 'UnsafeMutablePointer<PublicItem>' has no member 'reinterpretCast'func reveal(items: [PublicItem]) -> [PublicItem] { // invalid redeclaration of 'reveal(items:)'func reveal(items: [PrivateItem]) -> [PublicItem] { // invalid redeclaration of 'reveal(items:)'return items.map { PublicItem(value: $0.value) } // 'value' is inaccessible due to 'private' protection levelreturn items.map { PrivateItem(value: $0.value) } // 'value' is inaccessible due to 'private' protection levellet revealedItems = reveal(items: privateItems) // ambiguous use of 'reveal(items:)'XCTAssertEqual([0, 1, 2], revealedItems.map(\.value)) // cannot infer key path type from context; consider explicitly specifying a root typestruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let memory = UnsafeMutableRawPointer.allocate(byteCount: items.count * MemoryLayout<PrivateItem>.size, alignment: MemoryLayout<PrivateItem>.alignment)
defer { memory.deallocate() }
let pointer = memory.bindMemory(to: PrivateItem.self, capacity: items.count)
items.withUnsafeBufferPointer { pointer.initialize(from: $0) }
return pointer.reinterpret(to: PublicItem.self).map { $0 }
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let memory = UnsafeMutableRawPointer.allocate(byteCount: items.count * MemoryLayout<PrivateItem>.size, alignment: MemoryLayout<PrivateItem>.alignment)
defer { memory.deallocate() }
let pointer = memory.bindMemory(to: PrivateItem.self, capacity: items.count)
items.withUnsafeBufferPointer { pointer.initialize(from: $0) }
return pointer.reinterpret(to: PublicItem.self).map { $0 }
}
let items = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: items)
print(publicItems)
```items.withUnsafeBufferPointer { pointer.initialize(from: $0) } // 'initialize(from:)' is unavailable: it will be removed in Swift 5.0. Please use 'UnsafeMutableBufferPointer.initialize(from:)' insteadreturn pointer.reinterpret(to: PublicItem.self).map { $0 } // value of type 'UnsafeMutablePointer<PrivateItem>' has no member 'reinterpret'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let pointer = UnsafeMutablePointer<PrivateItem>.allocate(capacity: count)
defer { pointer.deallocate() }
pointer.initialize(from: items)
return pointer.reinterpret(to: PublicItem.self).map { $0 }
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let pointer = UnsafeMutablePointer<PrivateItem>.allocate(capacity: count)
defer { pointer.deallocate() }
pointer.initialize(from: items)
return pointer.reinterpret(to: PublicItem.self).map { $0 }
}
let items = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let revealed = reveal(items: items)
print(revealed)
// [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```pointer.initialize(from: items) // 'initialize(from:)' is unavailable: it will be removed in Swift 5.0. Please use 'UnsafeMutableBufferPointer.initialize(from:)' insteadreturn pointer.reinterpret(to: PublicItem.self).map { $0 } // value of type 'UnsafeMutablePointer<PrivateItem>' has no member 'reinterpret'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return withUnsafePointer(to: items[0]) {
UnsafeBufferPointer(start: $0, count: items.count)
}.map {
PublicItem(value: $0.pointee.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] {
return withUnsafePointer(to: items[0]) {
UnsafeBufferPointer(start: $0, count: items.count)
}.map {
PublicItem(value: $0.pointee.value)
}
}
let items = [PrivateItem(value: 1), PrivateItem(value: 2)]
let revealed = reveal(items: items)
print(revealed)
```PublicItem(value: $0.pointee.value) // value of type 'PrivateItem' has no member 'pointee'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return withUnsafePointer(to: items[0]) {
UnsafeBufferPointer(start: $0, count: items.count)
}.map {
PublicItem(value: $0.pointee.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] {
return withUnsafePointer(to: items[0]) {
UnsafeBufferPointer(start: $0, count: items.count)
}.map {
PublicItem(value: $0.pointee.value)
}
}
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2)]
let publicItems = reveal(items: privateItems)
print(publicItems)
// [PublicItem(value: 1), PublicItem(value: 2)]
```PublicItem(value: $0.pointee.value) // value of type 'PrivateItem' has no member 'pointee'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer { buffer in
return Array(UnsafeBufferPointer(start: buffer.baseAddress?.assumingMemoryBound(to: PublicItem.self), count: buffer.count))
}
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer { buffer in
return Array(UnsafeBufferPointer(start: buffer.baseAddress?.assumingMemoryBound(to: PublicItem.self), count: buffer.count))
}
}
let items = [PrivateItem(value: 1), PrivateItem(value: 2)]
let revealed = reveal(items: items)
print(revealed) // [PublicItem(value: 1), PublicItem(value: 2)]
```return Array(UnsafeBufferPointer(start: buffer.baseAddress?.assumingMemoryBound(to: PublicItem.self), count: buffer.count)) // value of type 'UnsafePointer<PrivateItem>' has no member 'assumingMemoryBound'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let pointer = UnsafeMutablePointer<PrivateItem>.allocate(capacity: items.count)
defer { pointer.deallocate() }
pointer.initialize(from: items)
return UnsafeBufferPointer(start: pointer, count: items.count).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 pointer = UnsafeMutablePointer<PrivateItem>.allocate(capacity: items.count)
defer { pointer.deallocate() }
pointer.initialize(from: items)
return UnsafeBufferPointer(start: pointer, count: items.count).map { PublicItem(value: $0.value) }
}
// Test
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2)]
let publicItems = reveal(items: privateItems)
print(publicItems) // [PublicItem(value: 1), PublicItem(value: 2)]
```pointer.initialize(from: items) // 'initialize(from:)' is unavailable: it will be removed in Swift 5.0. Please use 'UnsafeMutableBufferPointer.initialize(from:)' insteadreturn UnsafeBufferPointer(start: pointer, count: items.count).map { PublicItem(value: $0.value) } // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let memory = UnsafeMutableRawPointer(mutating: items)
let publicMemory = memory.bindMemory(to: PublicItem.self, capacity: items.count)
return Array(UnsafeBufferPointer(start: publicMemory, count: items.count))
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let memory = UnsafeMutableRawPointer(mutating: items)
let publicMemory = memory.bindMemory(to: PublicItem.self, capacity: items.count)
return Array(UnsafeBufferPointer(start: publicMemory, count: items.count))
}
let items = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: items)
print(publicItems)
// [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```let memory = UnsafeMutableRawPointer(mutating: items) // initialization of 'UnsafeMutableRawPointer' results in a dangling pointerstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let pointer = UnsafeMutablePointer<PrivateItem>.allocate(capacity: count)
defer { pointer.deallocate() }
pointer.initialize(from: items, count: count)
return pointer.reinterpret(to: PublicItem.self, count: count)
}
func reveal(items: [PublicItem]) -> [PublicItem] {
let count = items.count
let pointer = UnsafeMutablePointer<PublicItem>.allocate(capacity: count)
defer { pointer.deallocate() }
pointer.initialize(from: items, count: count)
return pointer.reinterpret(to: PublicItem.self, count: count)
}
func reveal(items: [PublicItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
func reveal(items: [PrivateItem]) -> [PrivateItem] {
return items.map { PrivateItem(value: $0.value) }
}
func reveal(items: [PublicItem]) -> [PrivateItem] {
return items.map { PrivateItem(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 count = items.count
let pointer = UnsafeMutablePointer<PrivateItem>.allocate(capacity: count)
defer { pointer.deallocate() }
pointer.initialize(from: items, count: count)
return pointer.reinterpret(to: PublicItem.self, count: count)
}
// Function to convert an array of structs with public 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: [PublicItem]) -> [PublicItem] {
let count = items.count
let pointer = UnsafeMutablePointer<PublicItem>.allocate(capacity: count)
defer { pointer.deallocate() }
pointer.initialize(from: items, count: count)
return pointer.reinterpret(to: PublicItem.self, count: count)
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying memory.
func reveal(items: [PublicItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying memory.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying memory.
func reveal(items: [PrivateItem]) -> [PrivateItem] {
return items.map { PrivateItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying memory.
func reveal(items: [PublicItem]) -> [PrivateItem] {
return items.map { PrivateItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying memory.
func reveal(items: [PublicItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying memory.
func reveal(items: [PrivateItem]) -> [PrivateItem] {
return items.map { PrivateItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying memory.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying memory.
func reveal(items: [PublicItem]) -> [PrivateItem] {
return items.map { PrivateItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying memory.
func reveal(items: [PublicItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying memory.
func reveal(items: [PrivateItem]) -> [PrivateItem] {
return items.map { PrivateItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying memory.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
// Function to convert an array of structs with public integer fields into an array of public structs with identical integer fields by copying memory.
func reveal(items: [PublicItem]) -> [PrivateItem] {
return items.map { PrivateItem(value: $0.value) }
}
//return pointer.reinterpret(to: PublicItem.self, count: count) // value of type 'UnsafeMutablePointer<PrivateItem>' has no member 'reinterpret'return pointer.reinterpret(to: PublicItem.self, count: count) // value of type 'UnsafeMutablePointer<PublicItem>' has no member 'reinterpret'func reveal(items: [PublicItem]) -> [PublicItem] { // invalid redeclaration of 'reveal(items:)'func reveal(items: [PrivateItem]) -> [PublicItem] { // invalid redeclaration of 'reveal(items:)'return items.map { PublicItem(value: $0.value) } // 'value' is inaccessible due to 'private' protection levelreturn items.map { PrivateItem(value: $0.value) } // 'value' is inaccessible due to 'private' protection levellet revealedItems = reveal(items: privateItems) // ambiguous use of 'reveal(items:)'XCTAssertEqual([0, 1, 2], revealedItems.map(\.value)) // cannot infer key path type from context; consider explicitly specifying a root typeenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split the version number string into an array of strings, where each string represents a number or a letter.
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
// Iterate over the components of both version number strings, comparing them one by one.
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
// If the components are equal, continue to the next component.
if lhsComponent == rhsComponent {
continue
}
// If the left hand side component is numeric, and the right hand side component is not, the left hand side component is ordered before the right hand side component.
if let lhsNumber = Int(lhsComponent), let _ = Int(rhsComponent) {
return lhsNumber < Int(rhsComponent) ? .orderedAscending : .orderedDescending
}
// If the left hand side component is not numeric, and the right hand side component is, the left hand side component is ordered after the right hand side component.
if let _ = Int(lhsComponent), let rhsNumber = Int(rhsComponent) {
return rhsNumber < lhsNumber ? .orderedDescending : .orderedAscending
}
// If the left hand side component is alpha, and the right hand side component is not, the left hand side component is ordered before the right hand side component.
if lhsComponent.hasPrefix("a") && !rhsComponent.hasPrefix("a") {
return .orderedAscending
}
// If the left hand side component is not alpha, and the right hand side component is, the left hand side component is ordered after the right hand side component.
if !lhsComponent.hasPrefix("a") && rhsComponent.hasPrefix("a") {
return .orderedDescending
}
// If the left hand side component is beta, and the right hand side component is not, the left hand side component is ordered before the right hand side component.
if lhsComponent.hasPrefix("b") && !rhsComponent.hasPrefix("b") {
return .orderedAscending
}
// If the left hand side component is not beta, and the right hand side component is, the left hand side component is ordered after the right hand side component.
if !lhsComponent.hasPrefix("b") && rhsComponent.hasPrefix("b") {
return .orderedDescending
}
// If the left hand side component is numeric, and the right hand side component is numeric, compare the numeric values of the components.
if let lhsNumber = Int(lhsComponent), let rhsNumber = Int(rhsComponent) {
return lhsNumber < rhsNumber ? .orderedAscending : .orderedDescending
}
// If the left hand side component is alpha, and the right hand side component is alpha, compare the alphabetic values of the components.
if lhsComponent.hasPrefix("a") && rhsComponent.hasPrefix("a") {
return lhsComponent < rhsComponent ? .orderedAscending : .orderedDescending
}
// If the left hand side component is beta, and the right hand side component is beta, compare the alphabetic values of the components.
if lhsComponent.hasPrefix("b") && rhsComponent.hasPrefix("b") {
return lhsComponent < rhsComponent ? .orderedAscending : .orderedDescending
}
// If the left hand side component is not numeric, alpha, or beta, and the right hand side component is not numeric, alpha, or beta, the left hand side component is ordered after the right hand side component.
return .orderedDescending
}
// If the components are equal, the version numbers are ordered the same.
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 {
// Split the version number string into an array of strings, where each string represents a number or a letter.
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
// Iterate over the components of both version number strings, comparing them one by one.
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
// If the components are equal, continue to the next component.
if lhsComponent == rhsComponent {
continue
}
// If the left hand side component is numeric, and the right hand side component is not, the left hand side component is ordered before the right hand side component.
if let lhsNumber = Int(lhsComponent), let _ = Int(rhsComponent) {
return lhsNumber < Int(rhsComponent) ? .orderedAscending : .orderedDescending
}
// If the left hand side component is not numeric, and the right hand side component is, the left hand side component is ordered after the right hand side component.
if let _ = Int(lhsComponent), let rhsNumber = Int(rhsComponent) {
return rhsNumber < lhsNumber ? .orderedDescending : .orderedAscending
}
// If the left hand side component is alpha, and the right hand side component is not, the left hand side component is ordered before the right hand side component.
if lhsComponent.hasPrefix("a") && !rhsComponent.hasPrefix("a") {
return .orderedAscending
}
// If the left hand side component is not alpha, and the right hand side component is, the left hand side component is ordered after the right hand side component.
if !lhsComponent.hasPrefix("a") && rhsComponent.hasPrefix("a") {
return .orderedDescending
}
// If the left hand side component is beta, and the right hand side component is not, the left hand side component is ordered before the right hand side component.
if lhsComponent.hasPrefix("b") && !rhsComponent.hasPrefix("b") {
return .orderedAscending
}
// If the left hand side component is not beta, and the right hand side component is, the left hand side component is ordered after the right hand side component.
if !lhsComponent.hasPrefix("b") && rhsComponent.hasPrefix("b") {
return .orderedDescending
}
// If the left hand side component is numeric, and the right hand side component is numeric, compare the numeric values of the components.
if let lhsNumber = Int(lhsComponent), let rhsNumber = Int(rhsComponent) {
return lhsNumber < rhsNumber ? .orderedAscending : .orderedDescending
}
// If the left hand side component is alpha, and the right hand side component is alpha, compare the alphabetic values of the components.
if lhsComponent.hasPrefix("a") && rhsComponent.hasPrefix("a") {
return lhsComponent < rhsComponent ? .orderedAscending : .orderedDescending
}
// If the left hand side component is beta, and the right hand side component is beta, compare the alphabetic values of the components.
if lhsComponent.hasPrefix("b") && rhsComponent.hasPrefix("b") {
return lhsComponent < rhsComponent ? .orderedAscending : .orderedDescending
}
// If the left hand side component is not numeric, alpha, or beta, and the right hand side component is not numeric, alpha, or beta, the left hand side component is ordered after the right hand side component.
return .orderedDescending
}
// If the components are equal, the version numbers are ordered the same.
return .orderedSame
}
```return lhsNumber < Int(rhsComponent) ? .orderedAscending : .orderedDescending // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return rhsNumber < lhsNumber ? .orderedDescending : .orderedAscending // cannot find 'lhsNumber' in scopeenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split the version number strings into an array of strings, where each string represents a number or a letter.
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
// Iterate over the components of both version number strings and compare them.
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
// If the components are equal, continue to the next component.
if lhsComponent == rhsComponent {
continue
}
// If the components are not equal, compare them as numbers.
if let lhsNumber = Int(lhsComponent), let rhsNumber = Int(rhsComponent) {
if lhsNumber < rhsNumber {
return .orderedAscending
} else {
return .orderedDescending
}
}
// If the components are not equal and they are not numbers, compare them as strings.
if lhsComponent < rhsComponent {
return .orderedAscending
} else {
return .orderedDescending
}
}
// If the components are equal, the version number strings are ordered the same.
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 {
// Split the version number strings into an array of strings, where each string represents a number or a letter.
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
// Iterate over the components of both version number strings and compare them.
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
// If the components are equal, continue to the next component.
if lhsComponent == rhsComponent {
continue
}
// If the components are not equal, compare them as numbers.
if let lhsNumber = Int(lhsComponent), let rhsNumber = Int(rhsComponent) {
if lhsNumber < rhsNumber {
return .orderedAscending
} else {
return .orderedDescending
}
}
// If the components are not equal and they are not numbers, compare them as strings.
if lhsComponent < rhsComponent {
return .orderedAscending
} else {
return .orderedDescending
}
}
// If the components are equal, the version number strings are ordered the same.
return .orderedSame
}
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split the version number strings into their components.
let lhsComponents = lhs.split(separator: ".")
let rhsComponents = rhs.split(separator: ".")
// Iterate over the components of both version number strings.
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
// Convert the components to integers.
let lhsComponent = Int(lhsComponent) ?? 0
let rhsComponent = Int(rhsComponent) ?? 0
// If the components are not equal, compare them.
if lhsComponent != rhsComponent {
return lhsComponent < rhsComponent ? .orderedAscending : .orderedDescending
}
}
// If the components are equal, compare the length of the version number strings.
if lhsComponents.count != rhsComponents.count {
return lhsComponents.count < rhsComponents.count ? .orderedAscending : .orderedDescending
}
// If the components are equal and the length of the version number strings is equal, the version number strings are equal.
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split the version number strings into their components.
let lhsComponents = lhs.split(separator: ".")
let rhsComponents = rhs.split(separator: ".")
// Iterate over the components of both version number strings.
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
// Convert the components to integers.
let lhsComponent = Int(lhsComponent) ?? 0
let rhsComponent = Int(rhsComponent) ?? 0
// If the components are not equal, compare them.
if lhsComponent != rhsComponent {
return lhsComponent < rhsComponent ? .orderedAscending : .orderedDescending
}
}
// If the components are equal, compare the length of the version number strings.
if lhsComponents.count != rhsComponents.count {
return lhsComponents.count < rhsComponents.count ? .orderedAscending : .orderedDescending
}
// If the components are equal and the length of the version number strings is equal, the version number strings are equal.
return .orderedSame
}
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".").map { Int($0)! }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0)! }
let componentsCount = min(lhsComponents.count, rhsComponents.count)
for index in 0..<componentsCount {
let lhsComponent = lhsComponents[index]
let rhsComponent = rhsComponents[index]
if lhsComponent < rhsComponent {
return .orderedAscending
} else if lhsComponent > rhsComponent {
return .orderedDescending
}
}
if lhsComponents.count > rhsComponents.count {
return .orderedDescending
} else if lhsComponents.count < rhsComponents.count {
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: ".").map { Int($0)! }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0)! }
let componentsCount = min(lhsComponents.count, rhsComponents.count)
for index in 0..<componentsCount {
let lhsComponent = lhsComponents[index]
let rhsComponent = rhsComponents[index]
if lhsComponent < rhsComponent {
return .orderedAscending
} else if lhsComponent > rhsComponent {
return .orderedDescending
}
}
if lhsComponents.count > rhsComponents.count {
return .orderedDescending
} else if lhsComponents.count < rhsComponents.count {
return .orderedAscending
}
return .orderedSame
}
// Tests
let version1 = "1.0.0"
let version2 = "1.0.1"
let version3 = "1.1.0"
let version4 = "1.1.1"
let version5 = "2.0.0"
let version6 = "2.1.0"
let version7 = "2.1.1"
let version8 = "2.2.0"
let version9 = "2.2.1"
let version10 = "2.2.2"
let version11 = "2.3.0"
let version12 = "2.3.1"
let version13 = "2.3.2"
let version14 = "2.4.0"
let version15 = "2.4.1"
let version16 = "2.4.2"
let version17 = "2.5.0"
let version18 = "2.5.1"
let version19 = "2.5.2"
let version20 = "2.5.3"
let version21 = "2.5.4"
let version22 = "2.5.5"
let version23 = "2.5.6"
let version24 = "2.5.7"
let version25 = "2.5.8"
let version26 = "2.5.9"
let version27 = "2.6.0"
let version28 = "2.6.1"
let version29 = "2.6.2"
let version30 = "2.6.3"
let version31 = "2.6.4"
let version32 = "2.6.5"
let version33 = "2.6.6"
let version34 = "2.6.7"
let version35 = "2.6.8"
let version36 = "2.6.9"
let version37 = "2.7.0"
let version38 = "2.7.1"
let version39 = "2.7.2"
let version40 = "2.7.3"
let version41 = "2.7.4"
let version42 = "2.7.5"
let version43 = "2.7.6"
let version44 = "2.7.7"
let version45 = "2.7.8"
let version46 = "2.7.9"
let version47 = "2.7.10"
let version48 = "2.7.11"
let version49 = "2.7.12"
let version50 = "2.7.13"
let version51 = "2.7.14"
let version52 = "2.7.15"
let version53 = "2.7.16"
let version54 = "2.7.17"
let version55 = "2.7.18"
let version56 = "2.7.19"
let version57 = "2.7.20"
let version58 = "2.7.21"
let version59 = "2.7.22"
let version60 = "2.7.23"
let version61 = "2.7.24"
let version62 = "2.7.25" // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split the version number strings into components.
let lhsComponents = lhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0) ?? 0 }
// Compare the components.
for (lhs, rhs) in zip(lhsComponents, rhsComponents) {
if lhs < rhs {
return .orderedAscending
} else if lhs > rhs {
return .orderedDescending
}
}
// The versions are equal.
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split the version number strings into components.
let lhsComponents = lhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0) ?? 0 }
// Compare the components.
for (lhs, rhs) in zip(lhsComponents, rhsComponents) {
if lhs < rhs {
return .orderedAscending
} else if lhs > rhs {
return .orderedDescending
}
}
// The versions are equal.
return .orderedSame
}
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split the version numbers into an array of strings.
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
// Iterate over the components of the two version numbers.
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
// If the components are equal, continue to the next component.
if lhsComponent == rhsComponent {
continue
}
// If the left hand side component is less than the right hand side component, return .orderedAscending.
if lhsComponent < rhsComponent {
return .orderedAscending
}
// If the left hand side component is greater than the right hand side component, return .orderedDescending.
if lhsComponent > rhsComponent {
return .orderedDescending
}
}
// If the components are equal, return .orderedSame.
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 {
// Split the version numbers into an array of strings.
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
// Iterate over the components of the two version numbers.
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
// If the components are equal, continue to the next component.
if lhsComponent == rhsComponent {
continue
}
// If the left hand side component is less than the right hand side component, return .orderedAscending.
if lhsComponent < rhsComponent {
return .orderedAscending
}
// If the left hand side component is greater than the right hand side component, return .orderedDescending.
if lhsComponent > rhsComponent {
return .orderedDescending
}
}
// If the components are equal, return .orderedSame.
return .orderedSame
}
// Tests
compareVersions("1.0.0", "1.0.0") // .orderedSame
compareVersions("1.0.0", "1.0.1") // .orderedDescending
compareVersions("1.0.1", "1.0.0") // .orderedAscending
compareVersions("1.0.0", "1.1.0") // .orderedDescending
compareVersions("1.1.0", "1.0.0") // .orderedAscending
compareVersions("1.0.0", "1.0.0a") // .orderedDescending
compareVersions("1.0.0a", "1.0.0") // .orderedAscending
compareVersions("1.0.0a", "1.0.0b") // .orderedAscending
compareVersions("1.0.0b", "1.0.0a") // .orderedDescending
compareVersions("1.0.0a", "1.0.0b") // .orderedDescending
compareVersions("1.0.0b", "1.0.0a") // .orderedAscending
compareVersions("1.0.0a", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0a") // .orderedAscending
compareVersions("1.0.0", "1.0.0b") // .orderedAscending
compareVersions("1.0.0b", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0") // .orderedSame
compareVersions("1.0.0", "1.0.0.0") // .orderedSame
compareVersions("1.0.0.0", "1.0.0") // .orderedSame
compareVersions("1.0.0", "1.0.0.0a") // .orderedDescending
compareVersions("1.0.0.0a", "1.0.0") // .orderedAscending
compareVersions("1.0.0.0a", "1.0.0.0b") // .orderedAscending
compareVersions("1.0.0.0b", "1.0.0.0a") // .orderedDescending
compareVersions("1.0.0.0a", "1.0.0.0") // .orderedDescending
compareVersions("1.0.0.0", "1.0.0.0a") // .orderedAscending
compareVersions("1.0.0.0", "1.0.0.0b") // .orderedAscending
compareVersions("1.0.0.0b", "1.0.0.0") // .orderedDescending
compareVersions("1.0.0.0", "1.0.0.0") // .orderedSame
compareVersions("1.0.0.0", "1.0.0.0.0") // .orderedSame
compareVersions("1. // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0) ?? 0 }
if lhsComponents == rhsComponents {
return .orderedSame
}
if lhsComponents.count > rhsComponents.count {
return .orderedDescending
}
if lhsComponents.count < rhsComponents.count {
return .orderedAscending
}
for i in 0..<lhsComponents.count {
if lhsComponents[i] > rhsComponents[i] {
return .orderedDescending
}
if lhsComponents[i] < rhsComponents[i] {
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: ".").map { Int($0) ?? 0 }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0) ?? 0 }
if lhsComponents == rhsComponents {
return .orderedSame
}
if lhsComponents.count > rhsComponents.count {
return .orderedDescending
}
if lhsComponents.count < rhsComponents.count {
return .orderedAscending
}
for i in 0..<lhsComponents.count {
if lhsComponents[i] > rhsComponents[i] {
return .orderedDescending
}
if lhsComponents[i] < rhsComponents[i] {
return .orderedAscending
}
}
return .orderedSame
}
// Example usage
let result = compareVersions("1.0.0", "2.0.0")
switch result {
case .orderedAscending:
print("lhs < rhs")
case .orderedDescending:
print("lhs > rhs")
case .orderedSame:
print("lhs == rhs")
}
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".").map { Int($0)! }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0)! }
let componentsCount = min(lhsComponents.count, rhsComponents.count)
for i in 0..<componentsCount {
if lhsComponents[i] < rhsComponents[i] {
return .orderedAscending
} else if lhsComponents[i] > rhsComponents[i] {
return .orderedDescending
}
}
if lhsComponents.count > rhsComponents.count {
return .orderedDescending
} else if lhsComponents.count < rhsComponents.count {
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: ".").map { Int($0)! }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0)! }
let componentsCount = min(lhsComponents.count, rhsComponents.count)
for i in 0..<componentsCount {
if lhsComponents[i] < rhsComponents[i] {
return .orderedAscending
} else if lhsComponents[i] > rhsComponents[i] {
return .orderedDescending
}
}
if lhsComponents.count > rhsComponents.count {
return .orderedDescending
} else if lhsComponents.count < rhsComponents.count {
return .orderedAscending
}
return .orderedSame
}
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".").map { Int($0)! }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0)! }
if lhsComponents == rhsComponents {
return .orderedSame
}
if lhsComponents.count > rhsComponents.count {
return .orderedDescending
}
if lhsComponents.count < rhsComponents.count {
return .orderedAscending
}
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
if lhsComponent > rhsComponent {
return .orderedDescending
}
if lhsComponent < rhsComponent {
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: ".").map { Int($0)! }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0)! }
if lhsComponents == rhsComponents {
return .orderedSame
}
if lhsComponents.count > rhsComponents.count {
return .orderedDescending
}
if lhsComponents.count < rhsComponents.count {
return .orderedAscending
}
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
if lhsComponent > rhsComponent {
return .orderedDescending
}
if lhsComponent < rhsComponent {
return .orderedAscending
}
}
return .orderedSame
}
// Tests
compareVersions("1.0.0", "1.0.0") // .orderedSame
compareVersions("1.0.0", "1.0.1") // .orderedAscending
compareVersions("1.0.1", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.1.0") // .orderedAscending
compareVersions("1.1.0", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "2.0.0") // .orderedAscending
compareVersions("2.0.0", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0b") // .orderedAscending
compareVersions("1.0.0b", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0a") // .orderedAscending
compareVersions("1.0.0a", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0a1") // .orderedAscending
compareVersions("1.0.0a1", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0a10") // .orderedAscending
compareVersions("1.0.0a10", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0b1") // .orderedAscending
compareVersions("1.0.0b1", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0b10") // .orderedAscending
compareVersions("1.0.0b10", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0rc1") // .orderedAscending
compareVersions("1.0.0rc1", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0rc10") // .orderedAscending
compareVersions("1.0.0rc10", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0rc100") // .orderedAscending
compareVersions("1.0.0rc100", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0rc1000") // .orderedAscending
compareVersions("1.0.0rc1000", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0rc10000") // .orderedAscending
compareVersions("1.0.0rc10000", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0rc100000") // .orderedAscending
compareVersions // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split the version number strings into an array of strings.
let lhsComponents = lhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0) ?? 0 }
// Compare the version number strings by their components.
for (lhs, rhs) in zip(lhsComponents, rhsComponents) {
if lhs < rhs {
return .orderedAscending
} else if lhs > rhs {
return .orderedDescending
}
}
// If the version number strings are equal, compare their suffixes.
let lhsSuffix = lhsComponents.dropFirst(lhsComponents.count - rhsComponents.count)
let rhsSuffix = rhsComponents.dropFirst(rhsComponents.count - lhsComponents.count)
for (lhs, rhs) in zip(lhsSuffix, rhsSuffix) {
if lhs < rhs {
return .orderedAscending
} else if lhs > rhs {
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 {
// Split the version number strings into an array of strings.
let lhsComponents = lhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0) ?? 0 }
// Compare the version number strings by their components.
for (lhs, rhs) in zip(lhsComponents, rhsComponents) {
if lhs < rhs {
return .orderedAscending
} else if lhs > rhs {
return .orderedDescending
}
}
// If the version number strings are equal, compare their suffixes.
let lhsSuffix = lhsComponents.dropFirst(lhsComponents.count - rhsComponents.count)
let rhsSuffix = rhsComponents.dropFirst(rhsComponents.count - lhsComponents.count)
for (lhs, rhs) in zip(lhsSuffix, rhsSuffix) {
if lhs < rhs {
return .orderedAscending
} else if lhs > rhs {
return .orderedDescending
}
}
return .orderedSame
}
``` // Fatal error: Can't drop a negative number of elements from a collection