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 {
// ...
}```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 {
// ...
}
```
} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
// ...
}```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 {
// ...
}
// JSON parser, returns standard error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
```
} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
// ...
}```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 {
// ...
}
```
} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
// ...
}```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 {
// ...
}
```
} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
// ...
}```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 {
// ...
}
```
} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
// ...
}```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 {
// ...
}
```
} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
// ...
}```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 {
// ...
}
// JSON parser, returns Swift's built-in error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
```
} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
// ...
}```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 {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
// ...
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: string.data(using: .utf8)!, 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 {
do {
return try JSONSerialization.jsonObject(with: string.data(using: .utf8)!, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
```
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json 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 {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json asindirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name)\(attributesString.isEmpty ? "" : " \(attributesString)\(childrenString.isEmpty ? "/>" : ">\(childrenString)</\(name)>")"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name)\(attributesString.isEmpty ? "" : " \(attributesString)\(childrenString.isEmpty ? "/>" : ">\(childrenString)</\(name)>")"
}
}
// Example of usage
let html = HTMLNode.element("div", attributes: ["class": "container"], children: [
HTMLNode.element("a", attributes: ["href": "swifteval"]),
HTMLNode.element("p", children: [HTMLNode.text("Hello, SwiftEval!")])
])
let generatedHTML = generate(html)
print(generatedHTML)
```
return "<\(name)\(attributesString.isEmpty ? "" : " \(attributesString)\(childrenString.isEmpty ? "/>" : ">\(childrenString)</\(name)>")" // unterminated string literalreturn "<\(name)\(attributesString.isEmpty ? "" : " \(attributesString)\(childrenString.isEmpty ? "/>" : ">\(childrenString)</\(name)>")" // cannot find ')' to match opening '(' in string interpolationindirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: " ")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: " ")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// Example usage
let htmlTree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
let htmlString = generate(htmlTree)
print(htmlString) // Output: <div><a href="swifteval"></a></div>
```
Start: a ["href": "swifteval"] // XCTAssertEqual failed: (Start: div [:]indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "\n")
return "<\(name) \(attributesString)>\n\(childrenString)\n</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "\n")
return "<\(name) \(attributesString)>\n\(childrenString)\n</\(name)>"
}
}
// Example usage:
let htmlTree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
let htmlString = generate(htmlTree)
print(htmlString)
```
Start: a ["href": "swifteval"] // XCTAssertEqual failed: (Start: div [:]indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "\n")
return "<\(name) \(attributesString)>\n\(childrenString)\n</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "\n")
return "<\(name) \(attributesString)>\n\(childrenString)\n</\(name)>"
}
}
// Example usage
let htmlTree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
let htmlString = generate(htmlTree)
print(htmlString)
```
Start: a ["href": "swifteval"] // XCTAssertEqual failed: (Start: div [:]indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// Example usage:
let htmlTree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
let htmlOutput = generate(htmlTree)
print(htmlOutput) // Output: <div><a href="swifteval"></a></div>
```
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// Example usage:
let html = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
let generatedHTML = generate(html)
print(generatedHTML) // Output: <div><a href="swifteval"></a></div>
```
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "\n")
return "<\(name) \(attributesString)>\n\(childrenString)\n</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "\n")
return "<\(name) \(attributesString)>\n\(childrenString)\n</\(name)>"
}
}
// Example of usage
let html = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
print(generate(html))
```
Start: a ["href": "swifteval"] // XCTAssertEqual failed: (Start: div [:]indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// Example usage:
let htmlTree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
let htmlOutput = generate(htmlTree)
print(htmlOutput) // Output: <div><a href="swifteval"></a></div>
```
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// Example usage
let htmlTree: HTMLNode = .element("div", children: [
.element("a", attributes: ["href": "swifteval"])
])
let htmlOutput = generate(htmlTree)
print(htmlOutput) // Output: <div><a href="swifteval"></a></div>
```
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "\n")
return "<\(name) \(attributesString)>\n\(childrenString)\n</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "\n")
return "<\(name) \(attributesString)>\n\(childrenString)\n</\(name)>"
}
}
// Example usage
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
let html = generate(tree)
print(html)
```
Start: a ["href": "swifteval"] // XCTAssertEqual failed: (Start: div [:]enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
var stack: [Double] = []
var operators: [String] = []
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if token == "(" {
operators.append(token)
} else if token == ")" {
while let operatorToken = operators.popLast(), operatorToken != "(" {
let right = stack.popLast()!
let left = stack.popLast()!
let result = try performOperation(left, right, operatorToken)
stack.append(result)
}
} else {
while let operatorToken = operators.last, precedence(operatorToken) >= precedence(token) {
let right = stack.popLast()!
let left = stack.popLast()!
let result = try performOperation(left, right, operatorToken)
stack.append(result)
operators.removeLast()
}
operators.append(token)
}
}
while let operatorToken = operators.popLast() {
let right = stack.popLast()!
let left = stack.popLast()!
let result = try performOperation(left, right, operatorToken)
stack.append(result)
}
guard let result = stack.popLast() else {
throw CalculateError.invalidInput
}
return result
}
func performOperation(_ left: Double, _ right: Double, _ operatorToken: String) throws -> Double {
switch operatorToken {
case "+":
return left + right
case "-":
return left - right
case "*":
return left * right
case "/":
guard right != 0 else {
throw CalculateError.invalidInput
}
return left / right
default:
throw CalculateError.invalidInput
}
}
func precedence(_ operatorToken: String) -> Int {
switch operatorToken {
case "+", "-":
return 1
case "*", "/":
return 2
default:
return 0
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
var stack: [Double] = []
var operators: [String] = []
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if token == "(" {
operators.append(token)
} else if token == ")" {
while let operatorToken = operators.popLast(), operatorToken != "(" {
let right = stack.popLast()!
let left = stack.popLast()!
let result = try performOperation(left, right, operatorToken)
stack.append(result)
}
} else {
while let operatorToken = operators.last, precedence(operatorToken) >= precedence(token) {
let right = stack.popLast()!
let left = stack.popLast()!
let result = try performOperation(left, right, operatorToken)
stack.append(result)
operators.removeLast()
}
operators.append(token)
}
}
while let operatorToken = operators.popLast() {
let right = stack.popLast()!
let left = stack.popLast()!
let result = try performOperation(left, right, operatorToken)
stack.append(result)
}
guard let result = stack.popLast() else {
throw CalculateError.invalidInput
}
return result
}
// Helper function to perform an operation on two numbers.
func performOperation(_ left: Double, _ right: Double, _ operatorToken: String) throws -> Double {
switch operatorToken {
case "+":
return left + right
case "-":
return left - right
case "*":
return left * right
case "/":
guard right != 0 else {
throw CalculateError.invalidInput
}
return left / right
default:
throw CalculateError.invalidInput
}
}
// Helper function to get the precedence of an operator.
func precedence(_ operatorToken: String) -> Int {
switch operatorToken {
case "+", "-":
return 1
case "*", "/":
return 2
default:
return 0
}
}
```
operators.append(token) // cannot convert value of type 'String.SubSequence' (aka 'Substring') to expected argument type 'String'while let operatorToken = operators.last, precedence(operatorToken) >= precedence(token) { // cannot convert value of type 'String.SubSequence' (aka 'Substring') to expected argument type 'String'operators.append(token) // cannot convert value of type 'String.SubSequence' (aka 'Substring') to expected argument type 'String'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
let postfix = try infixToPostfix(tokens)
return try evaluatePostfix(postfix)
}
func infixToPostfix(_ tokens: [Substring]) throws -> [Substring] {
var stack: [Substring] = []
var output: [Substring] = []
for token in tokens {
if let number = Double(token) {
output.append(token)
} else if token == "(" {
stack.append(token)
} else if token == ")" {
while let top = stack.last, top != "(" {
output.append(stack.removeLast())
}
if let top = stack.last, top == "(" {
stack.removeLast()
} else {
throw CalculateError.invalidInput
}
} else if let operatorToken = Operator(rawValue: token) {
while let top = stack.last, let topOperator = Operator(rawValue: top), topOperator.precedence >= operatorToken.precedence {
output.append(stack.removeLast())
}
stack.append(token)
} else {
throw CalculateError.invalidInput
}
}
while let top = stack.last {
if top == "(" {
throw CalculateError.invalidInput
}
output.append(stack.removeLast())
}
return output
}
func evaluatePostfix(_ postfix: [Substring]) throws -> Double {
var stack: [Double] = []
for token in postfix {
if let number = Double(token) {
stack.append(number)
} else if let operatorToken = Operator(rawValue: token) {
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
let result = try operatorToken.evaluate(left, right)
stack.append(result)
} else {
throw CalculateError.invalidInput
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack[0]
}
enum Operator: String {
case addition = "+"
case subtraction = "-"
case multiplication = "*"
case division = "/"
var precedence: Int {
switch self {
case .addition, .subtraction:
return 1
case .multiplication, .division:
return 2
}
}
func evaluate(_ left: Double, _ right: Double) throws -> Double {
switch self {
case .addition:
return left + right
case .subtraction:
return left - right
case .multiplication:
return left * right
case .division:
guard right != 0 else {
throw CalculateError.invalidInput
}
return left / right
}
}
}```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 postfix = try infixToPostfix(tokens)
return try evaluatePostfix(postfix)
}
// Convert infix expression to postfix.
// Example: "2+2*2" -> ["2", "2", "2", "*", "+"]
func infixToPostfix(_ tokens: [Substring]) throws -> [Substring] {
var stack: [Substring] = []
var output: [Substring] = []
for token in tokens {
if let number = Double(token) {
output.append(token)
} else if token == "(" {
stack.append(token)
} else if token == ")" {
while let top = stack.last, top != "(" {
output.append(stack.removeLast())
}
if let top = stack.last, top == "(" {
stack.removeLast()
} else {
throw CalculateError.invalidInput
}
} else if let operatorToken = Operator(rawValue: token) {
while let top = stack.last, let topOperator = Operator(rawValue: top), topOperator.precedence >= operatorToken.precedence {
output.append(stack.removeLast())
}
stack.append(token)
} else {
throw CalculateError.invalidInput
}
}
while let top = stack.last {
if top == "(" {
throw CalculateError.invalidInput
}
output.append(stack.removeLast())
}
return output
}
// Evaluate postfix expression.
// Example: ["2", "2", "2", "*", "+"] -> 6
func evaluatePostfix(_ postfix: [Substring]) throws -> Double {
var stack: [Double] = []
for token in postfix {
if let number = Double(token) {
stack.append(number)
} else if let operatorToken = Operator(rawValue: token) {
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
let result = try operatorToken.evaluate(left, right)
stack.append(result)
} else {
throw CalculateError.invalidInput
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack[0]
}
// Operator enum with precedence and evaluation function.
enum Operator: String {
case addition = "+"
case subtraction = "-"
case multiplication = "*"
case division = "/"
var precedence: Int {
switch self {
case .addition, .subtraction:
return 1
case .multiplication, .division:
return 2
}
}
func evaluate(_ left: Double, _ right: Double) throws -> Double {
switch self {
case .addition:
return left + right
case .subtraction:
return left - right
case .multiplication:
return left * right
case .division:
guard right != 0 else {
throw CalculateError.invalidInput
}
return left / right
}
}
}
```
} else if let operatorToken = Operator(rawValue: token) { // cannot convert value of type 'Substring' to expected argument type 'String'while let top = stack.last, let topOperator = Operator(rawValue: top), topOperator.precedence >= operatorToken.precedence { // cannot convert value of type 'Substring' to expected argument type 'String'} else if let operatorToken = Operator(rawValue: token) { // cannot convert value of type 'Substring' to expected argument type 'String'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
guard tokens.count > 0 else {
throw CalculateError.invalidInput
}
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left + right)
case "-":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left - right)
case "*":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left * right)
case "/":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
guard right != 0 else {
throw CalculateError.invalidInput
}
stack.append(left / right)
default:
guard let number = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(number)
}
}
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: " ")
guard tokens.count > 0 else {
throw CalculateError.invalidInput
}
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left + right)
case "-":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left - right)
case "*":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left * right)
case "/":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
guard right != 0 else {
throw CalculateError.invalidInput
}
stack.append(left / right)
default:
guard let number = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(number)
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack[0]
}
// Example usage:
do {
let result = try calculate("2+2*2")
print(result) // Output: 6.0
} catch CalculateError.invalidInput {
print("Invalid input")
}
```
// Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet(charactersIn: "+-*/()").inverted)
guard !tokens.isEmpty else { throw CalculateError.invalidInput }
var stack = [Double]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else {
guard let right = stack.popLast(), let left = stack.popLast() else { throw CalculateError.invalidInput }
switch token {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
}
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.first!
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet(charactersIn: "+-*/()").inverted)
guard !tokens.isEmpty else { throw CalculateError.invalidInput }
var stack = [Double]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else {
guard let right = stack.popLast(), let left = stack.popLast() else { throw CalculateError.invalidInput }
switch token {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
}
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.first!
}
```
// Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var stack: [Double] = []
var currentNumber = ""
var currentOperator: String? = nil
for char in string {
if char.isNumber || char == "." {
currentNumber.append(char)
} else if char == "(" {
stack.append(Double(currentNumber) ?? 0)
currentNumber = ""
stack.append(Double(currentOperator) ?? 0)
currentOperator = nil
} else if char == ")" {
let result = calculate(stack, currentNumber)
stack.append(result)
currentNumber = ""
currentOperator = nil
} else if char == "+" || char == "-" || char == "*" || char == "/" {
if let operatorValue = Double(currentOperator) {
let result = calculate(stack, currentNumber)
stack.append(result)
}
currentOperator = String(char)
currentNumber = ""
} else {
throw CalculateError.invalidInput
}
}
if let operatorValue = Double(currentOperator) {
let result = calculate(stack, currentNumber)
stack.append(result)
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack[0]
}
func calculate(_ stack: [Double], _ currentNumber: String) -> Double {
let number = Double(currentNumber) ?? 0
let operatorValue = stack.last ?? 0
switch operatorValue {
case 0:
return number
case 1:
return stack[stack.count - 2] + number
case 2:
return stack[stack.count - 2] - number
case 3:
return stack[stack.count - 2] * number
case 4:
return stack[stack.count - 2] / number
default:
return 0
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var stack: [Double] = []
var currentNumber = ""
var currentOperator: String? = nil
for char in string {
if char.isNumber || char == "." {
currentNumber.append(char)
} else if char == "(" {
stack.append(Double(currentNumber) ?? 0)
currentNumber = ""
stack.append(Double(currentOperator) ?? 0)
currentOperator = nil
} else if char == ")" {
let result = calculate(stack, currentNumber)
stack.append(result)
currentNumber = ""
currentOperator = nil
} else if char == "+" || char == "-" || char == "*" || char == "/" {
if let operatorValue = Double(currentOperator) {
let result = calculate(stack, currentNumber)
stack.append(result)
}
currentOperator = String(char)
currentNumber = ""
} else {
throw CalculateError.invalidInput
}
}
if let operatorValue = Double(currentOperator) {
let result = calculate(stack, currentNumber)
stack.append(result)
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack[0]
}
// Helper function to calculate the result of a sub-expression.
func calculate(_ stack: [Double], _ currentNumber: String) -> Double {
let number = Double(currentNumber) ?? 0
let operatorValue = stack.last ?? 0
switch operatorValue {
case 0:
return number
case 1:
return stack[stack.count - 2] + number
case 2:
return stack[stack.count - 2] - number
case 3:
return stack[stack.count - 2] * number
case 4:
return stack[stack.count - 2] / number
default:
return 0
}
}
```
stack.append(Double(currentOperator) ?? 0) // value of optional type 'String?' must be unwrapped to a value of type 'String'if let operatorValue = Double(currentOperator) { // value of optional type 'String?' must be unwrapped to a value of type 'String'if let operatorValue = Double(currentOperator) { // value of optional type 'String?' must be unwrapped to a value of type 'String'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
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)
default:
guard let number = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(number)
}
}
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: " ")
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)
default:
guard let number = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(number)
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack[0]
}
```
// Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
guard tokens.count > 0 else {
throw CalculateError.invalidInput
}
var stack: [Double] = []
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left + right)
case "-":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left - right)
case "*":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left * right)
case "/":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
guard right != 0 else {
throw CalculateError.invalidInput
}
stack.append(left / right)
default:
guard let number = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(number)
}
}
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: " ")
guard tokens.count > 0 else {
throw CalculateError.invalidInput
}
var stack: [Double] = []
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left + right)
case "-":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left - right)
case "*":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left * right)
case "/":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
guard right != 0 else {
throw CalculateError.invalidInput
}
stack.append(left / right)
default:
guard let number = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(number)
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack[0]
}
```
// Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var stack: [Double] = []
var operators: [String] = []
let tokens = string.components(separatedBy: CharacterSet(charactersIn: "+-*/()").inverted)
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if token == "(" {
operators.append(token)
} else if token == ")" {
while let operatorToken = operators.last, operatorToken != "(" {
let rightOperand = stack.removeLast()
let leftOperand = stack.removeLast()
let result = try performOperation(operatorToken, leftOperand, rightOperand)
stack.append(result)
operators.removeLast()
}
operators.removeLast() // Remove "("
} else if let operatorToken = token as? String, let operatorIndex = ["+", "-", "*", "/"].firstIndex(of: operatorToken) {
while let lastOperator = operators.last, let lastOperatorIndex = ["+", "-", "*", "/"].firstIndex(of: lastOperator), lastOperatorIndex >= operatorIndex {
let rightOperand = stack.removeLast()
let leftOperand = stack.removeLast()
let result = try performOperation(lastOperator, leftOperand, rightOperand)
stack.append(result)
operators.removeLast()
}
operators.append(token)
} else {
throw CalculateError.invalidInput
}
}
while let operatorToken = operators.last {
let rightOperand = stack.removeLast()
let leftOperand = stack.removeLast()
let result = try performOperation(operatorToken, leftOperand, rightOperand)
stack.append(result)
operators.removeLast()
}
guard let result = stack.last else {
throw CalculateError.invalidInput
}
return result
}
func performOperation(_ operatorToken: String, _ leftOperand: Double, _ rightOperand: Double) throws -> Double {
switch operatorToken {
case "+":
return leftOperand + rightOperand
case "-":
return leftOperand - rightOperand
case "*":
return leftOperand * rightOperand
case "/":
guard rightOperand != 0 else {
throw CalculateError.invalidInput
}
return leftOperand / rightOperand
default:
throw CalculateError.invalidInput
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var stack: [Double] = []
var operators: [String] = []
let tokens = string.components(separatedBy: CharacterSet(charactersIn: "+-*/()").inverted)
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if token == "(" {
operators.append(token)
} else if token == ")" {
while let operatorToken = operators.last, operatorToken != "(" {
let rightOperand = stack.removeLast()
let leftOperand = stack.removeLast()
let result = try performOperation(operatorToken, leftOperand, rightOperand)
stack.append(result)
operators.removeLast()
}
operators.removeLast() // Remove "("
} else if let operatorToken = token as? String, let operatorIndex = ["+", "-", "*", "/"].firstIndex(of: operatorToken) {
while let lastOperator = operators.last, let lastOperatorIndex = ["+", "-", "*", "/"].firstIndex(of: lastOperator), lastOperatorIndex >= operatorIndex {
let rightOperand = stack.removeLast()
let leftOperand = stack.removeLast()
let result = try performOperation(lastOperator, leftOperand, rightOperand)
stack.append(result)
operators.removeLast()
}
operators.append(token)
} else {
throw CalculateError.invalidInput
}
}
while let operatorToken = operators.last {
let rightOperand = stack.removeLast()
let leftOperand = stack.removeLast()
let result = try performOperation(operatorToken, leftOperand, rightOperand)
stack.append(result)
operators.removeLast()
}
guard let result = stack.last else {
throw CalculateError.invalidInput
}
return result
}
// Perform operation on two operands.
func performOperation(_ operatorToken: String, _ leftOperand: Double, _ rightOperand: Double) throws -> Double {
switch operatorToken {
case "+":
return leftOperand + rightOperand
case "-":
return leftOperand - rightOperand
case "*":
return leftOperand * rightOperand
case "/":
guard rightOperand != 0 else {
throw CalculateError.invalidInput
}
return leftOperand / rightOperand
default:
throw CalculateError.invalidInput
}
}
```
} else if let operatorToken = token as? String, let operatorIndex = ["+", "-", "*", "/"].firstIndex(of: operatorToken) { // conditional cast from 'String' to 'String' always succeeds // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
guard tokens.count > 0 else {
throw CalculateError.invalidInput
}
var stack: [Double] = []
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else {
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
switch token {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
}
}
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: " ")
guard tokens.count > 0 else {
throw CalculateError.invalidInput
}
var stack: [Double] = []
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else {
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
switch token {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack[0]
}
```
// Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var tokens = string.components(separatedBy: CharacterSet(charactersIn: "+-*/()").inverted)
tokens.removeAll(where: { $0.isEmpty })
var stack: [Double] = []
var operators: [String] = []
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if token == "(" {
operators.append(token)
} else if token == ")" {
while let operatorToken = operators.last, operatorToken != "(" {
let rightOperand = stack.removeLast()
let leftOperand = stack.removeLast()
let result = applyOperator(operatorToken, leftOperand, rightOperand)
stack.append(result)
operators.removeLast()
}
operators.removeLast() // Remove "("
} else if let operatorToken = token as? String {
while let lastOperator = operators.last, precedence(operatorToken) <= precedence(lastOperator) {
let rightOperand = stack.removeLast()
let leftOperand = stack.removeLast()
let result = applyOperator(operators.removeLast(), leftOperand, rightOperand)
stack.append(result)
}
operators.append(operatorToken)
} else {
throw CalculateError.invalidInput
}
}
while let operatorToken = operators.last {
let rightOperand = stack.removeLast()
let leftOperand = stack.removeLast()
let result = applyOperator(operators.removeLast(), leftOperand, rightOperand)
stack.append(result)
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack[0]
}
func applyOperator(_ operatorToken: String, _ leftOperand: Double, _ rightOperand: Double) -> Double {
switch operatorToken {
case "+":
return leftOperand + rightOperand
case "-":
return leftOperand - rightOperand
case "*":
return leftOperand * rightOperand
case "/":
return leftOperand / rightOperand
default:
fatalError("Invalid operator")
}
}
func precedence(_ operatorToken: String) -> Int {
switch operatorToken {
case "+", "-":
return 1
case "*", "/":
return 2
default:
fatalError("Invalid operator")
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var tokens = string.components(separatedBy: CharacterSet(charactersIn: "+-*/()").inverted)
tokens.removeAll(where: { $0.isEmpty })
var stack: [Double] = []
var operators: [String] = []
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if token == "(" {
operators.append(token)
} else if token == ")" {
while let operatorToken = operators.last, operatorToken != "(" {
let rightOperand = stack.removeLast()
let leftOperand = stack.removeLast()
let result = applyOperator(operatorToken, leftOperand, rightOperand)
stack.append(result)
operators.removeLast()
}
operators.removeLast() // Remove "("
} else if let operatorToken = token as? String {
while let lastOperator = operators.last, precedence(operatorToken) <= precedence(lastOperator) {
let rightOperand = stack.removeLast()
let leftOperand = stack.removeLast()
let result = applyOperator(operators.removeLast(), leftOperand, rightOperand)
stack.append(result)
}
operators.append(operatorToken)
} else {
throw CalculateError.invalidInput
}
}
while let operatorToken = operators.last {
let rightOperand = stack.removeLast()
let leftOperand = stack.removeLast()
let result = applyOperator(operators.removeLast(), leftOperand, rightOperand)
stack.append(result)
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack[0]
}
// Apply operator to operands.
func applyOperator(_ operatorToken: String, _ leftOperand: Double, _ rightOperand: Double) -> Double {
switch operatorToken {
case "+":
return leftOperand + rightOperand
case "-":
return leftOperand - rightOperand
case "*":
return leftOperand * rightOperand
case "/":
return leftOperand / rightOperand
default:
fatalError("Invalid operator")
}
}
// Get precedence of operator.
func precedence(_ operatorToken: String) -> Int {
switch operatorToken {
case "+", "-":
return 1
case "*", "/":
return 2
default:
fatalError("Invalid operator")
}
}
```
} else if let operatorToken = token as? String { // conditional cast from 'String' to 'String' always succeedswhile let operatorToken = operators.last { // value 'operatorToken' was defined but never used; consider replacing with boolean test // Fatal error: Can't remove last element from an empty collectionfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, String(task.terminationReason))
}```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.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, String(task.terminationReason))
}
// Example usage:
let (stdout, stderr) = execute(binary: "/path/to/binary", arguments: ["arg1", "arg2"])
print("stdout: \(stdout)")
print("stderr: \(stderr)")
```
return (output, String(task.terminationReason)) // no exact matches in call to initializerfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, String(data: pipe.fileHandleForReading.readDataToEndOfFile(), encoding: .utf8) ?? "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, String(data: pipe.fileHandleForReading.readDataToEndOfFile(), encoding: .utf8) ?? "")
}
```
// XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
return (output, error)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
return (output, error)
}
// Example usage:
let (stdout, stderr) = execute(binary: "/usr/bin/ls", arguments: ["-l"])
print("stdout: \(stdout)")
print("stderr: \(stderr)")
```
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
let errorPipe = Pipe()
task.standardOutput = outputPipe
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
return (output, error)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
let errorPipe = Pipe()
task.standardOutput = outputPipe
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
return (output, error)
}
```
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, String(data: pipe.fileHandleForReading.readDataToEndOfFile(), encoding: .utf8) ?? "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, String(data: pipe.fileHandleForReading.readDataToEndOfFile(), encoding: .utf8) ?? "")
}
```
// 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.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, String(data: pipe.fileHandleForReading.readDataToEndOfFile(), encoding: .utf8) ?? "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, String(data: pipe.fileHandleForReading.readDataToEndOfFile(), encoding: .utf8) ?? "")
}
```
// XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, error)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
task.waitUntilExit()
return (output, error)
}
// Example usage:
let (stdout, stderr) = execute(binary: "/usr/bin/ls", arguments: ["-l"])
print("stdout: \(stdout)")
print("stderr: \(stderr)")
```
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
task.waitUntilExit()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
return (output, error)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
task.waitUntilExit()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
return (output, error)
}
```
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
let errorPipe = Pipe()
task.standardOutput = outputPipe
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
return (output, error)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
let errorPipe = Pipe()
task.standardOutput = outputPipe
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
return (output, error)
}
```
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
return (output, error)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
return (output, error)
}
// Example usage:
let (stdout, stderr) = execute(binary: "/path/to/binary", arguments: ["arg1", "arg2"])
print("stdout: \(stdout)")
print("stderr: \(stderr)")
```
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cachedResult = cache[input] {
return cachedResult
} else {
let result = function(input)
cache[input] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cachedResult = cache[input] {
return cachedResult
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
// Example usage:
let fibonacci = memoize { (n: Int) -> Int in
if n <= 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 55
```
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
// Example usage:
let fibonacci = memoize { (n: Int) -> Int in
if n <= 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 55
```
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cachedResult = cache[input] {
return cachedResult
} else {
let result = function(input)
cache[input] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cachedResult = cache[input] {
return cachedResult
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
// Example usage:
let fibonacci = memoize { (n: Int) -> Int in
if n <= 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 55
```
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cachedResult = cache[input] {
return cachedResult
}
let result = function(input)
cache[input] = result
return result
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cachedResult = cache[input] {
return cachedResult
}
let result = function(input)
cache[input] = result
return result
}
}
// Example usage:
let fibonacci = memoize { (n: Int) -> Int in
if n <= 1 {
return n
}
return fibonacci(n - 1) + fibonacci(n - 2)
}
print(fibonacci(10)) // Output: 55
```
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
// Example usage:
let fibonacci = memoize { (n: Int) -> Int in
if n <= 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 55
```
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cachedResult = cache[input] {
return cachedResult
}
let result = function(input)
cache[input] = result
return result
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cachedResult = cache[input] {
return cachedResult
}
let result = function(input)
cache[input] = result
return result
}
}
// Example usage:
let fibonacci = memoize { (n: Int) -> Int in
if n <= 1 {
return n
}
return fibonacci(n - 1) + fibonacci(n - 2)
}
print(fibonacci(10)) // Output: 55
```
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
}
let result = function(input)
cache[input] = result
return result
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
}
let result = function(input)
cache[input] = result
return result
}
}
// Example usage of memoization function
let fibonacci = memoize { (n: Int) -> Int in
if n <= 1 {
return n
}
return fibonacci(n - 1) + fibonacci(n - 2)
}
print(fibonacci(10)) // Output: 55
```
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cachedResult = cache[input] {
return cachedResult
} else {
let result = function(input)
cache[input] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cachedResult = cache[input] {
return cachedResult
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
// Example usage of memoization function.
let fibonacci = memoize { (n: Int) -> Int in
if n <= 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 55
```
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
// Example usage:
let fibonacci = memoize { (n: Int) -> Int in
if n <= 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 55
print(fibonacci(10)) // Output: 55 (cached result)
```
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cachedResult = cache[input] {
return cachedResult
}
let result = function(input)
cache[input] = result
return result
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let cachedResult = cache[input] {
return cachedResult
}
let result = function(input)
cache[input] = result
return result
}
}
// Example usage:
let fibonacci = memoize { (n: Int) -> Int in
if n <= 1 {
return n
}
return fibonacci(n - 1) + fibonacci(n - 2)
}
print(fibonacci(10)) // Output: 55
```
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var result: T?
var error: Error?
for _ in 0..<attempts {
do {
result = try task()
break
} catch {
error = error
}
}
if let result = result {
return result
} else {
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 result: T?
var error: Error?
for _ in 0..<attempts {
do {
result = try task()
break
} catch {
error = error
}
}
if let result = result {
return result
} else {
throw error!
}
}
// Example usage:
do {
let result = try retry(attempts: 3) {
// Perform a task that may fail
// ...
return "Success!"
}
print(result)
} catch {
print("Failed after 3 attempts: \(error)")
}
```
error = error // cannot assign to value: 'error' is immutablefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var result: T?
var error: Error?
for _ in 0..<attempts {
do {
result = try task()
break
} catch {
error = error
}
}
if let result = result {
return result
} else {
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 result: T?
var error: Error?
for _ in 0..<attempts {
do {
result = try task()
break
} catch {
error = error
}
}
if let result = result {
return result
} else {
throw error!
}
}
// Example usage:
do {
let result = try retry(attempts: 3) {
// Perform some task that may fail
throw NSError(domain: "", code: 0, userInfo: nil)
}
print(result)
} catch {
print("Failed after 3 attempts: \(error)")
}
```
error = error // cannot assign to value: 'error' is immutablefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var result: T?
var error: Error?
for _ in 0..<attempts {
do {
result = try task()
break
} catch {
error = error
}
}
if let result = result {
return result
} else {
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 result: T?
var error: Error?
for _ in 0..<attempts {
do {
result = try task()
break
} catch {
error = error
}
}
if let result = result {
return result
} else {
throw error!
}
}
// Example usage:
do {
let result = try retry(attempts: 3) {
// Perform some task that may fail
throw NSError(domain: "", code: 0, userInfo: nil)
}
print(result)
} catch {
print("Failed after 3 attempts: \(error)")
}
```
error = error // cannot assign to value: 'error' is immutablefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
// Handle error here
}
}
throw NSError(domain: "com.example.retry", code: 1, userInfo: [NSLocalizedDescriptionKey: "Task failed after \(attempts) attempts"])
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
// Handle error here
}
}
throw NSError(domain: "com.example.retry", code: 1, userInfo: [NSLocalizedDescriptionKey: "Task failed after \(attempts) attempts"])
}
// Example usage:
do {
let result = try retry(attempts: 3) {
// Perform task here
throw NSError(domain: "com.example.task", code: 1, userInfo: [NSLocalizedDescriptionKey: "Task failed"])
}
print(result)
} catch {
print(error.localizedDescription)
}
```
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var result: T?
var error: Error?
for _ in 0..<attempts {
do {
result = try task()
return result!
} catch {
error = error
}
}
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 result: T?
var error: Error?
for _ in 0..<attempts {
do {
result = try task()
return result!
} catch {
error = error
}
}
throw error!
}
// Example usage:
do {
let result = try retry(attempts: 3) {
// Perform a task that may fail
// ...
}
// Use the result
// ...
} catch {
// Handle the error
// ...
}
```
error = error // cannot assign to value: 'error' is immutablefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var result: T?
var error: Error?
for _ in 0..<attempts {
do {
result = try task()
break
} catch {
error = error
}
}
if let result = result {
return result
} else {
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 result: T?
var error: Error?
for _ in 0..<attempts {
do {
result = try task()
break
} catch {
error = error
}
}
if let result = result {
return result
} else {
throw error!
}
}
// Example usage:
do {
let result = try retry(attempts: 3) {
// Perform task that may fail
throw NSError(domain: "", code: 0, userInfo: nil)
}
print(result)
} catch {
print("Failed after 3 attempts: \(error)")
}
```
error = error // cannot assign to value: 'error' is immutablefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var result: T?
for _ in 0..<attempts {
do {
result = try task()
break
} catch {
// Handle error
}
}
guard let result = result else {
throw NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey: "Task failed after \(attempts) attempts"])
}
return result
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var result: T?
for _ in 0..<attempts {
do {
result = try task()
break
} catch {
// Handle error
}
}
guard let result = result else {
throw NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey: "Task failed after \(attempts) attempts"])
}
return result
}
// Example usage:
do {
let result = try retry(attempts: 3) {
// Perform task
return "Success"
}
print(result)
} catch {
print(error.localizedDescription)
}
```
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var result: T?
var error: Error?
for _ in 0..<attempts {
do {
result = try task()
break
} catch {
error = error
}
}
if let result = result {
return result
} else {
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 result: T?
var error: Error?
for _ in 0..<attempts {
do {
result = try task()
break
} catch {
error = error
}
}
if let result = result {
return result
} else {
throw error!
}
}
// Example usage:
do {
let result = try retry(attempts: 3) {
// Perform some task that may fail
throw NSError(domain: "com.example", code: 1, userInfo: [NSLocalizedDescriptionKey: "Task failed"])
}
print("Task succeeded with result: \(result)")
} catch {
print("Task failed with error: \(error)")
}
```
error = error // cannot assign to value: 'error' is immutablefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
// Handle error
}
}
throw NSError(domain: "com.example.retry", code: 1, userInfo: [NSLocalizedDescriptionKey: "Task failed after \(attempts) attempts"])
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
// Handle error
}
}
throw NSError(domain: "com.example.retry", code: 1, userInfo: [NSLocalizedDescriptionKey: "Task failed after \(attempts) attempts"])
}
// Example usage
do {
let result = try retry(attempts: 3) {
// Task that may fail
}
// Use result
} catch {
// Handle error
}
```
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
// Handle error and retry
}
}
throw NSError(domain: "com.example.retry", code: 1, userInfo: [NSLocalizedDescriptionKey: "Retry failed"])
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
// Handle error and retry
}
}
throw NSError(domain: "com.example.retry", code: 1, userInfo: [NSLocalizedDescriptionKey: "Retry failed"])
}
// Example usage:
do {
let result = try retry(attempts: 3) {
// Perform task that may fail
throw NSError(domain: "com.example.task", code: 1, userInfo: [NSLocalizedDescriptionKey: "Task failed"])
}
print(result)
} catch {
print(error)
}
```
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[type] 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: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[type] else { return nil }
return factory() as? T
}
}
// Example usage:
let container = DIContainer()
container.register(String.self) { "Hello, World!" }
let greeting = container.resolve(String.self)
print(greeting ?? "No greeting found.")
```
private var factories: [Any.Type: () -> Any] = [:] // type 'any Any.Type' does not conform to protocol 'Hashable'factories[type] = factory // type 'any Any.Type' cannot conform to 'Hashable'guard let factory = factories[type] else { return nil } // type 'any Any.Type' cannot conform to 'Hashable'protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[type] 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: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[type] else { return nil }
return factory() as? T
}
}
// Example usage:
let container = DIContainer()
container.register(MyClass.self) { MyClass() }
let instance = container.resolve(MyClass.self)
```
private var factories: [Any.Type: () -> Any] = [:] // type 'any Any.Type' does not conform to protocol 'Hashable'factories[type] = factory // type 'any Any.Type' cannot conform to 'Hashable'guard let factory = factories[type] else { return nil } // type 'any Any.Type' cannot conform to 'Hashable'protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}
// Example usage:
let container = DIContainer()
container.register(MyClass.self) { MyClass() }
let instance = container.resolve(MyClass.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) {
let key = String(describing: type)
factories[key] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}
// Example usage:
let container = DIContainer()
container.register(MyClass.self) { MyClass() }
let instance = container.resolve(MyClass.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) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else {
return nil
}
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else {
return nil
}
return factory() as? T
}
}
// Example usage:
let container = DIContainer()
container.register(MyClass.self) { MyClass() }
let instance = container.resolve(MyClass.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) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}
// Example usage:
let container = DIContainer()
// Register a dependency.
container.register(MyDependency.self) { MyDependency() }
// Resolve a dependency.
if let dependency = container.resolve(MyDependency.self) {
// Use the dependency.
}
```
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}
// Example usage:
let container = DIContainer()
container.register(MyClass.self) { MyClass() }
let myClass = container.resolve(MyClass.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) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}
// Example usage:
let container = DIContainer()
container.register(MyClass.self) { MyClass() }
if let myClass = container.resolve(MyClass.self) {
// Use myClass
}
```
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}
```
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] else { return nil }
return factory() as? T
}
}
// Example usage:
let container = DIContainer()
container.register(MyClass.self) { MyClass() }
let myClass = container.resolve(MyClass.self)
```
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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let next = transitions[currentState]?[event] else {
print("No transition defined for event \(event) from state \(currentState)")
return
}
currentState = next
}
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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let next = transitions[currentState]?[event] else {
print("No transition defined for event \(event) from state \(currentState)")
return
}
currentState = next
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage
let fsm = StateMachine(state: "off")
fsm.registerTransition(from: "off", to: "on", event: "turnOn")
fsm.registerTransition(from: "on", to: "off", event: "turnOff")
fsm.trigger(event: "turnOn") // Output: No transition defined for event turnOn from state off
fsm.trigger(event: "turnOff") // Output: No transition defined for event turnOff from state off
fsm.trigger(event: "turnOn") // Output: No transition defined for event turnOn from state off
fsm.trigger(event: "turnOff") // Output: No transition defined for event turnOff from state off
```
init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<States, Events>'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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let next = transitions[currentState]?[event] else {
print("No transition defined for event \(event) from state \(currentState)")
return
}
currentState = next
}
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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let next = transitions[currentState]?[event] else {
print("No transition defined for event \(event) from state \(currentState)")
return
}
currentState = next
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage
let machine = StateMachine(state: "Off")
machine.registerTransition(from: "Off", to: "On", event: "TurnOn")
machine.registerTransition(from: "On", to: "Off", event: "TurnOff")
machine.trigger(event: "TurnOn")
print(machine.state) // Output: On
machine.trigger(event: "TurnOff")
print(machine.state) // Output: Off
```
init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<States, Events>'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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("Invalid event \(event) for current state \(currentState)")
return
}
currentState = nextState
}
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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("Invalid event \(event) for current state \(currentState)")
return
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage
let stateMachine = StateMachine(state: .idle)
stateMachine.registerTransition(from: .idle, to: .loading, event: .start)
stateMachine.registerTransition(from: .loading, to: .loaded, event: .finish)
stateMachine.registerTransition(from: .loaded, to: .idle, event: .reset)
stateMachine.trigger(event: .start) // Current state: loading
stateMachine.trigger(event: .finish) // Current state: loaded
stateMachine.trigger(event: .reset) // Current state: idle
```
init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<States, Events>'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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("No transition defined for event \(event) from state \(currentState)")
return
}
currentState = nextState
}
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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("No transition defined for event \(event) from state \(currentState)")
return
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```
init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<States, Events>'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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("No transition defined for event \(event) from state \(currentState)")
return
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
if transitions[from] == nil {
transitions[from] = [:]
}
transitions[from]?[event] = to
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("No transition defined for event \(event) from state \(currentState)")
return
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
if transitions[from] == nil {
transitions[from] = [:]
}
transitions[from]?[event] = to
}
}
// Example usage
let stateMachine = StateMachine(state: .idle)
stateMachine.registerTransition(from: .idle, to: .loading, event: .start)
stateMachine.registerTransition(from: .loading, to: .success, event: .complete)
stateMachine.registerTransition(from: .loading, to: .failure, event: .error)
stateMachine.trigger(event: .start)
print(stateMachine.state) // Output: loading
stateMachine.trigger(event: .complete)
print(stateMachine.state) // Output: success
stateMachine.trigger(event: .error)
print(stateMachine.state) // Output: failure
```
init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<States, Events>'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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
var state: State
init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let next = transitions[state]?[event] else {
print("No transition registered for event \(event) from state \(state)")
return
}
state = next
}
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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
var state: State
init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let next = transitions[state]?[event] else {
print("No transition registered for event \(event) from state \(state)")
return
}
state = next
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```
init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<States, Events>'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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
var state: State
init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
print("No transition registered for event \(event) from state \(state)")
return
}
state = nextState
}
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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
var state: State
init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
print("No transition registered for event \(event) from state \(state)")
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```
init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<States, Events>'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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
if let nextState = transitions[currentState]?[event] {
currentState = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
if transitions[from] == nil {
transitions[from] = [event: to]
} else {
transitions[from]?[event] = to
}
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
if let nextState = transitions[currentState]?[event] {
currentState = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
if transitions[from] == nil {
transitions[from] = [event: to]
} else {
transitions[from]?[event] = to
}
}
}
// Example usage
let stateMachine = StateMachine(state: "Idle")
stateMachine.registerTransition(from: "Idle", to: "Running", event: "Start")
stateMachine.registerTransition(from: "Running", to: "Idle", event: "Stop")
stateMachine.trigger(event: "Start")
print(stateMachine.state) // Output: Running
stateMachine.trigger(event: "Stop")
print(stateMachine.state) // Output: Idle
```
init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<States, Events>'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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("No transition found for event \(event) from state \(currentState)")
return
}
currentState = nextState
}
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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("No transition found for event \(event) from state \(currentState)")
return
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage
let stateMachine = StateMachine(state: .idle)
stateMachine.registerTransition(from: .idle, to: .loading, event: .start)
stateMachine.registerTransition(from: .loading, to: .loaded, event: .finish)
stateMachine.registerTransition(from: .loaded, to: .idle, event: .reset)
stateMachine.trigger(event: .start)
print(stateMachine.state) // Output: loading
stateMachine.trigger(event: .finish)
print(stateMachine.state) // Output: loaded
stateMachine.trigger(event: .reset)
print(stateMachine.state) // Output: idle
```
init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<States, Events>'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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
if let nextState = transitions[currentState]?[event] {
currentState = nextState
}
}
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<States: Hashable, Events: Hashable>: StateMachineProtocol {
typealias State = States
typealias Event = Events
private var transitions: [State: [Event: State]] = [:]
private var currentState: State
init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
if let nextState = transitions[currentState]?[event] {
currentState = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage
let stateMachine = StateMachine(state: .idle)
stateMachine.registerTransition(from: .idle, to: .loading, event: .start)
stateMachine.registerTransition(from: .loading, to: .loaded, event: .finish)
stateMachine.trigger(event: .start)
print(stateMachine.state) // Output: loading
stateMachine.trigger(event: .finish)
print(stateMachine.state) // Output: loaded
```
init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<States, Events>'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(
name: "root",
contents: [
FileSystemNode.file(name: "file1.txt", size: 1024),
FileSystemNode.directory(
name: "subdir1",
contents: [
FileSystemNode.file(name: "file2.txt", size: 2048),
FileSystemNode.file(name: "file3.txt", size: 3072)
]
),
FileSystemNode.directory(
name: "subdir2",
contents: [
FileSystemNode.file(name: "file4.txt", size: 4096),
FileSystemNode.file(name: "file5.txt", size: 5120)
]
)
]
)
print("Total size: \(fileSystem.totalSize) bytes")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
```
return 1 + contents.map { $0.treeDepth }.max() ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(
name: "root",
contents: [
FileSystemNode.file(name: "file1.txt", size: 100),
FileSystemNode.directory(
name: "subdir1",
contents: [
FileSystemNode.file(name: "file2.txt", size: 200),
FileSystemNode.directory(
name: "subdir2",
contents: [
FileSystemNode.file(name: "file3.txt", size: 300)
]
)
]
),
FileSystemNode.file(name: "file4.txt", size: 400)
]
)
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
```
return 1 + contents.map { $0.treeDepth }.max() ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "root", contents: [
FileSystemNode.file(name: "file1.txt", size: 100),
FileSystemNode.directory(name: "subdir", contents: [
FileSystemNode.file(name: "file2.txt", size: 200),
FileSystemNode.file(name: "file3.txt", size: 300)
])
])
print(fileSystem.totalSize) // Output: 600
print(fileSystem.filesCount) // Output: 3
print(fileSystem.treeDepth) // Output: 2
```
return 1 + contents.map { $0.treeDepth }.max() ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "root", contents: [
FileSystemNode.file(name: "file1.txt", size: 100),
FileSystemNode.directory(name: "subdir", contents: [
FileSystemNode.file(name: "file2.txt", size: 200),
FileSystemNode.file(name: "file3.txt", size: 300)
])
])
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
```
return 1 + contents.map { $0.treeDepth }.max() ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "root", contents: [
FileSystemNode.file(name: "file1.txt", size: 100),
FileSystemNode.directory(name: "subdir1", contents: [
FileSystemNode.file(name: "file2.txt", size: 200),
FileSystemNode.file(name: "file3.txt", size: 300)
]),
FileSystemNode.directory(name: "subdir2", contents: [
FileSystemNode.file(name: "file4.txt", size: 400),
FileSystemNode.file(name: "file5.txt", size: 500)
])
])
print("Total size: \(fileSystem.totalSize)") // Output: Total size: 1500
print("Files count: \(fileSystem.filesCount)") // Output: Files count: 5
print("Tree depth: \(fileSystem.treeDepth)") // Output: Tree depth: 3
```
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "root", contents: [
FileSystemNode.file(name: "file1.txt", size: 100),
FileSystemNode.directory(name: "subdir1", contents: [
FileSystemNode.file(name: "file2.txt", size: 200),
FileSystemNode.directory(name: "subdir2", contents: [
FileSystemNode.file(name: "file3.txt", size: 300)
])
])
])
print(fileSystem.totalSize) // Output: 600
print(fileSystem.filesCount) // Output: 3
print(fileSystem.treeDepth) // Output: 3
```
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(
name: "root",
contents: [
FileSystemNode.file(name: "file1.txt", size: 100),
FileSystemNode.directory(
name: "subdir",
contents: [
FileSystemNode.file(name: "file2.txt", size: 200),
FileSystemNode.file(name: "file3.txt", size: 300)
]
)
]
)
print("Total size: \(fileSystem.totalSize)") // Output: Total size: 600
print("Files count: \(fileSystem.filesCount)") // Output: Files count: 3
print("Tree depth: \(fileSystem.treeDepth)") // Output: Tree depth: 3
```
return 1 + contents.map { $0.treeDepth }.max() ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "root", contents: [
FileSystemNode.file(name: "file1.txt", size: 100),
FileSystemNode.directory(name: "subdir", contents: [
FileSystemNode.file(name: "file2.txt", size: 200),
FileSystemNode.file(name: "file3.txt", size: 300)
])
])
print(fileSystem.totalSize) // Output: 600
print(fileSystem.filesCount) // Output: 3
print(fileSystem.treeDepth) // Output: 2
```
return 1 + contents.map { $0.treeDepth }.max() ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "root", contents: [
FileSystemNode.file(name: "file1.txt", size: 1024),
FileSystemNode.directory(name: "subdir", contents: [
FileSystemNode.file(name: "file2.txt", size: 2048),
FileSystemNode.file(name: "file3.txt", size: 3072)
])
])
print("Total size: \(fileSystem.totalSize) bytes")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
```
return 1 + contents.map { $0.treeDepth }.max() ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file(_, _):
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max() ?? 0
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "root", contents: [
FileSystemNode.file(name: "file1.txt", size: 100),
FileSystemNode.directory(name: "subdir", contents: [
FileSystemNode.file(name: "file2.txt", size: 200),
FileSystemNode.file(name: "file3.txt", size: 300)
])
])
print(fileSystem.totalSize) // Output: 600
print(fileSystem.filesCount) // Output: 3
print(fileSystem.treeDepth) // Output: 2
```
return 1 + contents.map { $0.treeDepth }.max() ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class IntegerStack: StackProtocol {
typealias Element = Int
private var elements: [Int] = []
init() {}
func push(_ element: Int) {
elements.append(element)
}
func pop() -> Int? {
return elements.popLast()
}
}
class StringStack: StackProtocol {
typealias Element = String
private var elements: [String] = []
init() {}
func push(_ element: String) {
elements.append(element)
}
func pop() -> String? {
return elements.popLast()
}
}
class BooleanStack: StackProtocol {
typealias Element = Bool
private var elements: [Bool] = []
init() {}
func push(_ element: Bool) {
elements.append(element)
}
func pop() -> Bool? {
return elements.popLast()
}
}
class DoubleStack: StackProtocol {
typealias Element = Double
private var elements: [Double] = []
init() {}
func push(_ element: Double) {
elements.append(element)
}
func pop() -> Double? {
return elements.popLast()
}
}
class FloatStack: StackProtocol {
typealias Element = Float
private var elements: [Float] = []
init() {}
func push(_ element: Float) {
elements.append(element)
}
func pop() -> Float? {
return elements.popLast()
}
}
class CharacterStack: StackProtocol {
typealias Element = Character
private var elements: [Character] = []
init() {}
func push(_ element: Character) {
elements.append(element)
}
func pop() -> Character? {
return elements.popLast()
}
}
class ArrayStack<Element>: StackProtocol {
typealias Element = [Element]
private var elements: [[Element]] = []
init() {}
func push(_ element: [Element]) {
elements.append(element)
}
func pop() -> [Element]? {
return elements.popLast()
}
}
class DictionaryStack<Key: Hashable, Value>: StackProtocol {
typealias Element = [Key: Value]
private var elements: [[Key: Value]] = []
init() {}
func push(_ element: [Key: Value]) {
elements.append(element)
}
func pop() -> [Key: Value]? {
return elements.popLast()
}
}
class SetStack<Element: Hashable>: StackProtocol {
typealias Element = Set<Element>
private var elements: [Set<Element>] = []
init() {}
func push(_ element: Set<Element>) {
elements.append(element)
}
func pop() -> Set<Element>? {
return elements.popLast()
}
}
class TupleStack<Element>: StackProtocol {
typealias Element = (Element, Element)
private var elements: [(Element, Element)] = []
init() {}
func push(_ element: (Element, Element)) {
elements.append(element)
}
func pop() -> (Element, Element)? {
return elements.popLast()
}
}
class OptionalStack<Element>: StackProtocol {
typealias Element = Element?
private var elements: [Element?] = []
init() {}
func push(_ element: Element?) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class ClosureStack<Element>: StackProtocol {
typealias Element = (Element) -> Void
private var elements: [(Element) -> Void] = []
init() {}
func push(_ element: (Element) -> Void) {
elements.append(element)
}
func pop() -> (Element) -> Void? {
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<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accept integers.
class IntegerStack: StackProtocol {
typealias Element = Int
private var elements: [Int] = []
init() {}
func push(_ element: Int) {
elements.append(element)
}
func pop() -> Int? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accept strings.
class StringStack: StackProtocol {
typealias Element = String
private var elements: [String] = []
init() {}
func push(_ element: String) {
elements.append(element)
}
func pop() -> String? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accept booleans.
class BooleanStack: StackProtocol {
typealias Element = Bool
private var elements: [Bool] = []
init() {}
func push(_ element: Bool) {
elements.append(element)
}
func pop() -> Bool? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accept doubles.
class DoubleStack: StackProtocol {
typealias Element = Double
private var elements: [Double] = []
init() {}
func push(_ element: Double) {
elements.append(element)
}
func pop() -> Double? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accept floats.
class FloatStack: StackProtocol {
typealias Element = Float
private var elements: [Float] = []
init() {}
func push(_ element: Float) {
elements.append(element)
}
func pop() -> Float? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accept characters.
class CharacterStack: StackProtocol {
typealias Element = Character
private var elements: [Character] = []
init() {}
func push(_ element: Character) {
elements.append(element)
}
func pop() -> Character? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accept arrays.
class ArrayStack<Element>: StackProtocol {
typealias Element = [Element]
private var elements: [[Element]] = []
init() {}
func push(_ element: [Element]) {
elements.append(element)
}
func pop() -> [Element]? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accept dictionaries.
class DictionaryStack<Key: Hashable, Value>: StackProtocol {
typealias Element = [Key: Value]
private var elements: [[Key: Value]] = []
init() {}
func push(_ element: [Key: Value]) {
elements.append(element)
}
func pop() -> [Key: Value]? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accept sets.
class SetStack<Element: Hashable>: StackProtocol {
typealias Element = Set<Element>
private var elements: [Set<Element>] = []
init() {}
func push(_ element: Set<Element>) {
elements.append(element)
}
func pop() -> Set<Element>? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accept tuples.
class TupleStack<Element>: StackProtocol {
typealias Element = (Element, Element)
private var elements: [(Element, Element)] = []
init() {}
func push(_ element: (Element, Element)) {
elements.append(element)
}
func pop() -> (Element, Element)? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accept optionals.
class OptionalStack<Element>: StackProtocol {
typealias Element = Element?
private var elements: [Element?] = []
init() {}
func push(_ element: Element?) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accept closures.
class ClosureStack<Element>: StackProtocol {
typealias Element = (Element) -> Void
private var elements: [(Element) -> Void] = []
init() {}
func push(_ element: (Element) -> Void) {
elements.append(element)
}
func pop() -> (Element) -> Void? {
return elements.popLast()
}
}
// Stack withinit() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<ElementType>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'IntegerStack'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'StringStack'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'BooleanStack'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'DoubleStack'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'FloatStack'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'CharacterStack'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'ArrayStack<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'DictionaryStack<Key, Value>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'SetStack<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'TupleStack<Element>'class OptionalStack<Element>: StackProtocol { // type 'OptionalStack<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'OptionalStack<Element>'return elements.popLast() // value of optional type 'Element??' must be unwrapped to a value of type 'Element?'class ClosureStack<Element>: StackProtocol { // type 'ClosureStack<Element>' does not conform to protocol 'StackProtocol'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'ClosureStack<Element>'elements.append(element) // converting non-escaping parameter 'element' to generic parameter 'Element' may allow it to escapereturn elements.popLast() // value of optional type '((Element) -> Void)?' must be unwrapped to a value of type '(Element) -> Void'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<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack of integers.
let intStack = Stack<Int>()
intStack.push(1)
intStack.push(2)
intStack.push(3)
print(intStack.pop() ?? "Stack is empty") // Output: 3
// Stack of strings.
let stringStack = Stack<String>()
stringStack.push("Hello")
stringStack.push("World")
print(stringStack.pop() ?? "Stack is empty") // Output: World
```
init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<ElementType>'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<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class IntStack: Stack<Int> {
init() {}
}
class StringStack: Stack<String> {
init() {}
}
class CustomObjectStack: Stack<CustomObject> {
init() {}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions for integers.
class IntStack: Stack<Int> {
init() {}
}
// Stack with push and pop functions for strings.
class StringStack: Stack<String> {
init() {}
}
// Stack with push and pop functions for custom objects.
class CustomObjectStack: Stack<CustomObject> {
init() {}
}
```
init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<ElementType>'init() {} // overriding declaration requires an 'override' keywordinit() {} // overriding declaration requires an 'override' keywordclass CustomObjectStack: Stack<CustomObject> { // cannot find type 'CustomObject' in scopeinit() {} // overriding declaration requires an 'override' keywordvar 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<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class CustomStack: StackProtocol {
typealias Element = String
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class AnotherCustomStack: StackProtocol {
typealias Element = Int
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class YetAnotherCustomStack: StackProtocol {
typealias Element = Double
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class OneMoreCustomStack: StackProtocol {
typealias Element = Bool
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class LastCustomStack: StackProtocol {
typealias Element = Character
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions and a custom type.
class CustomStack: StackProtocol {
typealias Element = String
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions and a custom type.
class AnotherCustomStack: StackProtocol {
typealias Element = Int
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions and a custom type.
class YetAnotherCustomStack: StackProtocol {
typealias Element = Double
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions and a custom type.
class OneMoreCustomStack: StackProtocol {
typealias Element = Bool
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions and a custom type.
class LastCustomStack: StackProtocol {
typealias Element = Character
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
```
init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<ElementType>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'CustomStack'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'AnotherCustomStack'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'YetAnotherCustomStack'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'OneMoreCustomStack'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'LastCustomStack'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<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack of integers.
let intStack = Stack<Int>()
intStack.push(1)
intStack.push(2)
intStack.push(3)
print(intStack.pop()) // Output: Optional(3)
// Stack of strings.
let stringStack = Stack<String>()
stringStack.push("Hello")
stringStack.push("World")
print(stringStack.pop()) // Output: Optional("World")
```
init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<ElementType>'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<ElementType>: StackProtocol {
var elements: [ElementType] = []
init() {}
func push(_ element: ElementType) {
elements.append(element)
}
func pop() -> ElementType? {
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<ElementType>: StackProtocol {
var elements: [ElementType] = []
init() {}
func push(_ element: ElementType) {
elements.append(element)
}
func pop() -> ElementType? {
return elements.popLast()
}
}
// Stack of integers.
let intStack = Stack<Int>()
intStack.push(1)
intStack.push(2)
intStack.push(3)
print(intStack.pop()) // Output: 3
// Stack of strings.
let stringStack = Stack<String>()
stringStack.push("Hello")
stringStack.push("World")
print(stringStack.pop()) // Output: World
```
init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<ElementType>'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<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class LimitedStack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
private let limit: Int
init(limit: Int) {
self.limit = limit
}
func push(_ element: Element) {
if elements.count < limit {
elements.append(element)
}
}
func pop() -> Element? {
return elements.popLast()
}
}
class CustomErrorStack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
private let limit: Int
init(limit: Int) {
self.limit = limit
}
func push(_ element: Element) {
if elements.count < limit {
elements.append(element)
} else {
throw CustomError.stackFull
}
}
func pop() -> Element? {
return elements.popLast()
}
}
enum CustomError: Error {
case stackFull
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions and a limit.
class LimitedStack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
private let limit: Int
init(limit: Int) {
self.limit = limit
}
func push(_ element: Element) {
if elements.count < limit {
elements.append(element)
}
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions and a limit and a custom error type.
class CustomErrorStack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
private let limit: Int
init(limit: Int) {
self.limit = limit
}
func push(_ element: Element) {
if elements.count < limit {
elements.append(element)
} else {
throw CustomError.stackFull
}
}
func pop() -> Element? {
return elements.popLast()
}
}
enum CustomError: Error {
case stackFull
}
```
init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<ElementType>'class LimitedStack<ElementType>: StackProtocol { // type 'LimitedStack<ElementType>' does not conform to protocol 'StackProtocol'class CustomErrorStack<ElementType>: StackProtocol { // type 'CustomErrorStack<ElementType>' does not conform to protocol 'StackProtocol'throw CustomError.stackFull // error is not handled because the enclosing function is not declared 'throws'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<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class PeekableStack<ElementType>: Stack<ElementType> {
override func push(_ element: ElementType) {
super.push(element)
}
func peek() -> ElementType? {
return elements.last
}
}
class EmptyCheckableStack<ElementType>: Stack<ElementType> {
override func push(_ element: ElementType) {
super.push(element)
}
func isEmpty() -> Bool {
return elements.isEmpty
}
}
class FullCheckableStack<ElementType>: Stack<ElementType> {
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
override func push(_ element: ElementType) {
if elements.count < capacity {
super.push(element)
} else {
print("Stack is full. Cannot push element.")
}
}
func isFull() -> Bool {
return elements.count == capacity
}
}
class EmptyAndFullCheckableStack<ElementType>: Stack<ElementType> {
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
override func push(_ element: ElementType) {
if elements.count < capacity {
super.push(element)
} else {
print("Stack is full. Cannot push element.")
}
}
func isEmpty() -> Bool {
return elements.isEmpty
}
func isFull() -> Bool {
return elements.count == capacity
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions that also supports peeking at the top element.
class PeekableStack<ElementType>: Stack<ElementType> {
override func push(_ element: ElementType) {
super.push(element)
}
func peek() -> ElementType? {
return elements.last
}
}
// Stack with push and pop functions that also supports checking if the stack is empty.
class EmptyCheckableStack<ElementType>: Stack<ElementType> {
override func push(_ element: ElementType) {
super.push(element)
}
func isEmpty() -> Bool {
return elements.isEmpty
}
}
// Stack with push and pop functions that also supports checking if the stack is full.
class FullCheckableStack<ElementType>: Stack<ElementType> {
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
override func push(_ element: ElementType) {
if elements.count < capacity {
super.push(element)
} else {
print("Stack is full. Cannot push element.")
}
}
func isFull() -> Bool {
return elements.count == capacity
}
}
// Stack with push and pop functions that also supports checking if the stack is empty or full.
class EmptyAndFullCheckableStack<ElementType>: Stack<ElementType> {
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
override func push(_ element: ElementType) {
if elements.count < capacity {
super.push(element)
} else {
print("Stack is full. Cannot push element.")
}
}
func isEmpty() -> Bool {
return elements.isEmpty
}
func isFull() -> Bool {
return elements.count == capacity
}
}
```
init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<ElementType>'return elements.last // 'elements' is inaccessible due to 'private' protection levelreturn elements.isEmpty // 'elements' is inaccessible due to 'private' protection levelif elements.count < capacity { // 'elements' is inaccessible due to 'private' protection levelreturn elements.count == capacity // 'elements' is inaccessible due to 'private' protection levelif elements.count < capacity { // 'elements' is inaccessible due to 'private' protection levelreturn elements.isEmpty // 'elements' is inaccessible due to 'private' protection levelreturn elements.count == capacity // 'elements' is inaccessible due to 'private' protection levelvar 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<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class FixedCapacityStack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.elements = Array(repeating: Element(), count: capacity)
}
func push(_ element: Element) {
if elements.count < capacity {
elements.append(element)
} else {
print("Stack is full. Cannot push element.")
}
}
func pop() -> Element? {
return elements.popLast()
}
}
class MaxCapacityStack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element]
private let maxCapacity: Int
init(maxCapacity: Int) {
self.maxCapacity = maxCapacity
self.elements = Array(repeating: Element(), count: maxCapacity)
}
func push(_ element: Element) {
if elements.count < maxCapacity {
elements.append(element)
} else {
print("Stack is full. Cannot push element.")
}
}
func pop() -> Element? {
return elements.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with a fixed capacity.
class FixedCapacityStack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.elements = Array(repeating: Element(), count: capacity)
}
func push(_ element: Element) {
if elements.count < capacity {
elements.append(element)
} else {
print("Stack is full. Cannot push element.")
}
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with a maximum capacity.
class MaxCapacityStack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element]
private let maxCapacity: Int
init(maxCapacity: Int) {
self.maxCapacity = maxCapacity
self.elements = Array(repeating: Element(), count: maxCapacity)
}
func push(_ element: Element) {
if elements.count < maxCapacity {
elements.append(element)
} else {
print("Stack is full. Cannot push element.")
}
}
func pop() -> Element? {
return elements.popLast()
}
}
```
init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<ElementType>'class FixedCapacityStack<ElementType>: StackProtocol { // type 'FixedCapacityStack<ElementType>' does not conform to protocol 'StackProtocol'self.elements = Array(repeating: Element(), count: capacity) // type 'FixedCapacityStack<ElementType>.Element' (aka 'ElementType') has no member 'init'class MaxCapacityStack<ElementType>: StackProtocol { // type 'MaxCapacityStack<ElementType>' does not conform to protocol 'StackProtocol'self.elements = Array(repeating: Element(), count: maxCapacity) // type 'MaxCapacityStack<ElementType>.Element' (aka 'ElementType') has no member 'init'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<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class PeekableStack<ElementType>: Stack<ElementType> {
override func push(_ element: ElementType) {
super.push(element)
}
func peek() -> ElementType? {
return elements.last
}
}
class EmptyCheckableStack<ElementType>: Stack<ElementType> {
override func push(_ element: ElementType) {
super.push(element)
}
func isEmpty() -> Bool {
return elements.isEmpty
}
}
class FullCheckableStack<ElementType>: Stack<ElementType> {
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
super.init()
}
override func push(_ element: ElementType) {
if elements.count < capacity {
super.push(element)
} else {
print("Stack is full")
}
}
func isFull() -> Bool {
return elements.count == capacity
}
}
class FullAndEmptyCheckableStack<ElementType>: Stack<ElementType> {
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
super.init()
}
override func push(_ element: ElementType) {
if elements.count < capacity {
super.push(element)
} else {
print("Stack is full")
}
}
func isEmpty() -> Bool {
return elements.isEmpty
}
func isFull() -> Bool {
return elements.count == capacity
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<ElementType>: StackProtocol {
typealias Element = ElementType
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions that also supports peeking at the top element.
class PeekableStack<ElementType>: Stack<ElementType> {
override func push(_ element: ElementType) {
super.push(element)
}
func peek() -> ElementType? {
return elements.last
}
}
// Stack with push and pop functions that also supports checking if the stack is empty.
class EmptyCheckableStack<ElementType>: Stack<ElementType> {
override func push(_ element: ElementType) {
super.push(element)
}
func isEmpty() -> Bool {
return elements.isEmpty
}
}
// Stack with push and pop functions that also supports checking if the stack is full.
class FullCheckableStack<ElementType>: Stack<ElementType> {
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
super.init()
}
override func push(_ element: ElementType) {
if elements.count < capacity {
super.push(element)
} else {
print("Stack is full")
}
}
func isFull() -> Bool {
return elements.count == capacity
}
}
// Stack with push and pop functions that also supports checking if the stack is full and empty.
class FullAndEmptyCheckableStack<ElementType>: Stack<ElementType> {
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
super.init()
}
override func push(_ element: ElementType) {
if elements.count < capacity {
super.push(element)
} else {
print("Stack is full")
}
}
func isEmpty() -> Bool {
return elements.isEmpty
}
func isFull() -> Bool {
return elements.count == capacity
}
}
```init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<ElementType>'return elements.last // 'elements' is inaccessible due to 'private' protection levelreturn elements.isEmpty // 'elements' is inaccessible due to 'private' protection levelif elements.count < capacity { // 'elements' is inaccessible due to 'private' protection levelreturn elements.count == capacity // 'elements' is inaccessible due to 'private' protection levelif elements.count < capacity { // 'elements' is inaccessible due to 'private' protection levelreturn elements.isEmpty // 'elements' is inaccessible due to 'private' protection levelreturn elements.count == capacity // 'elements' is inaccessible due to 'private' protection levelvar 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 order: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if cache.count > capacity {
if let keyToRemove = order.first {
order.remove(at: 0)
cache.removeValue(forKey: keyToRemove)
}
}
}
}
}```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 let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if cache.count > capacity {
if let keyToRemove = order.first {
order.remove(at: 0)
cache.removeValue(forKey: keyToRemove)
}
}
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
cache["d"] = 4
print(cache["a"]) // Output: nil
```
init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var order: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if cache.count > capacity {
if let keyToRemove = order.first {
cache.removeValue(forKey: keyToRemove)
order.removeFirst()
}
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var order: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if cache.count > capacity {
if let keyToRemove = order.first {
cache.removeValue(forKey: keyToRemove)
order.removeFirst()
}
}
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["one"] = 1
cache["two"] = 2
cache["three"] = 3
print(cache["one"]) // Output: Optional(1)
print(cache["two"]) // Output: Optional(2)
print(cache["three"]) // Output: Optional(3)
cache["four"] = 4
print(cache["one"]) // Output: nil
print(cache["two"]) // Output: Optional(2)
print(cache["three"]) // Output: Optional(3)
print(cache["four"]) // Output: Optional(4)
```
init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var order: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let _ = cache[key] {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
} else {
if order.count == capacity {
if let keyToRemove = order.first {
cache[keyToRemove] = nil
order.removeFirst()
}
}
}
cache[key] = newValue
order.append(key)
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var order: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let _ = cache[key] {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
} else {
if order.count == capacity {
if let keyToRemove = order.first {
cache[keyToRemove] = nil
order.removeFirst()
}
}
}
cache[key] = newValue
order.append(key)
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
cache["d"] = 4
print(cache["a"]) // Output: nil
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
print(cache["d"]) // Output: Optional(4)
```
init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var queue: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = queue.firstIndex(of: key) {
queue.remove(at: index)
queue.append(key)
return cache[key]
}
return nil
}
set {
if let _ = cache[key] {
if let index = queue.firstIndex(of: key) {
queue.remove(at: index)
}
} else {
if queue.count == capacity {
if let keyToRemove = queue.first {
cache[keyToRemove] = nil
queue.removeFirst()
}
}
}
cache[key] = newValue
queue.append(key)
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var queue: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = queue.firstIndex(of: key) {
queue.remove(at: index)
queue.append(key)
return cache[key]
}
return nil
}
set {
if let _ = cache[key] {
if let index = queue.firstIndex(of: key) {
queue.remove(at: index)
}
} else {
if queue.count == capacity {
if let keyToRemove = queue.first {
cache[keyToRemove] = nil
queue.removeFirst()
}
}
}
cache[key] = newValue
queue.append(key)
}
}
}
```
init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var order: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let _ = cache[key] {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
} else {
if order.count == capacity {
if let keyToRemove = order.first {
cache.removeValue(forKey: keyToRemove)
order.removeFirst()
}
}
}
cache[key] = newValue
order.append(key)
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var order: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let _ = cache[key] {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
} else {
if order.count == capacity {
if let keyToRemove = order.first {
cache.removeValue(forKey: keyToRemove)
order.removeFirst()
}
}
}
cache[key] = newValue
order.append(key)
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["one"] = 1
cache["two"] = 2
cache["three"] = 3
print(cache["one"]) // Output: Optional(1)
cache["four"] = 4 // "one" is removed from the cache
print(cache["one"]) // Output: nil
```
init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var order: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let _ = cache[key] {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
} else {
if cache.count == capacity {
cache.removeValue(forKey: order.removeFirst())
}
}
cache[key] = newValue
order.append(key)
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var order: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let _ = cache[key] {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
} else {
if cache.count == capacity {
cache.removeValue(forKey: order.removeFirst())
}
}
cache[key] = newValue
order.append(key)
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["one"] = 1
cache["two"] = 2
cache["three"] = 3
print(cache["one"]) // Output: 1
cache["four"] = 4 // "one" is removed from the cache
print(cache["one"]) // Output: nil
```
init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var keys: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
return cache[key]
}
return nil
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
cache[key] = newValue
if keys.count > capacity {
let keyToRemove = keys.removeFirst()
cache[keyToRemove] = nil
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var keys: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
return cache[key]
}
return nil
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
cache[key] = newValue
if keys.count > capacity {
let keyToRemove = keys.removeFirst()
cache[keyToRemove] = nil
}
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
cache["d"] = 4
print(cache["a"]) // Output: nil
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
print(cache["d"]) // Output: Optional(4)
```
init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var queue: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = queue.firstIndex(of: key) {
queue.remove(at: index)
queue.append(key)
return cache[key]
}
return nil
}
set {
if let _ = cache[key] {
if let index = queue.firstIndex(of: key) {
queue.remove(at: index)
}
} else {
if queue.count == capacity {
if let keyToRemove = queue.first {
cache[keyToRemove] = nil
queue.removeFirst()
}
}
}
cache[key] = newValue
queue.append(key)
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var queue: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = queue.firstIndex(of: key) {
queue.remove(at: index)
queue.append(key)
return cache[key]
}
return nil
}
set {
if let _ = cache[key] {
if let index = queue.firstIndex(of: key) {
queue.remove(at: index)
}
} else {
if queue.count == capacity {
if let keyToRemove = queue.first {
cache[keyToRemove] = nil
queue.removeFirst()
}
}
}
cache[key] = newValue
queue.append(key)
}
}
}
```
init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var keys: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
return cache[key]
}
return nil
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
cache[key] = newValue
if keys.count > capacity {
if let keyToRemove = keys.first {
keys.remove(at: 0)
cache.removeValue(forKey: keyToRemove)
}
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var keys: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
return cache[key]
}
return nil
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
cache[key] = newValue
if keys.count > capacity {
if let keyToRemove = keys.first {
keys.remove(at: 0)
cache.removeValue(forKey: keyToRemove)
}
}
}
}
}
```
init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var queue: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = queue.firstIndex(of: key) {
queue.remove(at: index)
queue.append(key)
return cache[key]
}
return nil
}
set {
if let _ = cache[key] {
if let index = queue.firstIndex(of: key) {
queue.remove(at: index)
}
} else {
if queue.count == capacity {
if let keyToRemove = queue.first {
cache[keyToRemove] = nil
queue.removeFirst()
}
}
}
queue.append(key)
cache[key] = newValue
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var queue: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = queue.firstIndex(of: key) {
queue.remove(at: index)
queue.append(key)
return cache[key]
}
return nil
}
set {
if let _ = cache[key] {
if let index = queue.firstIndex(of: key) {
queue.remove(at: index)
}
} else {
if queue.count == capacity {
if let keyToRemove = queue.first {
cache[keyToRemove] = nil
queue.removeFirst()
}
}
}
queue.append(key)
cache[key] = newValue
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["one"] = 1
cache["two"] = 2
cache["three"] = 3
print(cache["one"]) // Output: Optional(1)
print(cache["two"]) // Output: Optional(2)
print(cache["three"]) // Output: Optional(3)
cache["four"] = 4
print(cache["one"]) // Output: nil
print(cache["two"]) // Output: Optional(2)
print(cache["three"]) // Output: Optional(3)
print(cache["four"]) // Output: Optional(4)
```
init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
typealias Key = CacheKey
typealias Value = CacheValue
private var cache: [Key: CacheValue] = [:]
private var expirationTimes: [Key: TimeInterval] = [:]
private let expirationInterval: TimeInterval
init(expirationInterval: TimeInterval) {
self.expirationInterval = expirationInterval
}
func put(value: CacheValue, key: CacheKey, expiration: TimeInterval) {
cache[key] = value
expirationTimes[key] = Date().timeIntervalSince1970 + expiration
}
func get(key: CacheKey) -> CacheValue? {
if let expirationTime = expirationTimes[key], expirationTime < Date().timeIntervalSince1970 {
cache[key] = nil
expirationTimes[key] = nil
return nil
}
return cache[key]
}
subscript(key: CacheKey) -> CacheValue? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: expirationInterval)
} else {
cache[key] = nil
expirationTimes[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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
typealias Key = CacheKey
typealias Value = CacheValue
private var cache: [Key: CacheValue] = [:]
private var expirationTimes: [Key: TimeInterval] = [:]
private let expirationInterval: TimeInterval
init(expirationInterval: TimeInterval) {
self.expirationInterval = expirationInterval
}
func put(value: CacheValue, key: CacheKey, expiration: TimeInterval) {
cache[key] = value
expirationTimes[key] = Date().timeIntervalSince1970 + expiration
}
func get(key: CacheKey) -> CacheValue? {
if let expirationTime = expirationTimes[key], expirationTime < Date().timeIntervalSince1970 {
cache[key] = nil
expirationTimes[key] = nil
return nil
}
return cache[key]
}
subscript(key: CacheKey) -> CacheValue? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: expirationInterval)
} else {
cache[key] = nil
expirationTimes[key] = nil
}
}
}
}
// Usage example
let cache = ExpirableCache<String, String>(expirationInterval: 60) // Cache with expiration of 60 seconds
cache["key"] = "value"
print(cache["key"]) // Output: value
sleep(61)
print(cache["key"]) // Output: nil
```
let cache = ExpirableCache<String, String>() // missing argument for parameter 'expirationInterval' in callThread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
private var cache: [CacheKey: CacheValue] = [:]
private var expirationTimes: [CacheKey: TimeInterval] = [:]
private let expirationInterval: TimeInterval
init(expirationInterval: TimeInterval) {
self.expirationInterval = expirationInterval
}
func put(value: CacheValue, key: CacheKey, expiration: TimeInterval) {
cache[key] = value
expirationTimes[key] = expiration
}
func get(key: CacheKey) -> CacheValue? {
if let expirationTime = expirationTimes[key], expirationTime < Date().timeIntervalSince1970 {
cache.removeValue(forKey: key)
expirationTimes.removeValue(forKey: key)
return nil
}
return cache[key]
}
subscript(key: CacheKey) -> CacheValue? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: expirationInterval)
} else {
cache.removeValue(forKey: key)
expirationTimes.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
private var cache: [CacheKey: CacheValue] = [:]
private var expirationTimes: [CacheKey: TimeInterval] = [:]
private let expirationInterval: TimeInterval
init(expirationInterval: TimeInterval) {
self.expirationInterval = expirationInterval
}
func put(value: CacheValue, key: CacheKey, expiration: TimeInterval) {
cache[key] = value
expirationTimes[key] = expiration
}
func get(key: CacheKey) -> CacheValue? {
if let expirationTime = expirationTimes[key], expirationTime < Date().timeIntervalSince1970 {
cache.removeValue(forKey: key)
expirationTimes.removeValue(forKey: key)
return nil
}
return cache[key]
}
subscript(key: CacheKey) -> CacheValue? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: expirationInterval)
} else {
cache.removeValue(forKey: key)
expirationTimes.removeValue(forKey: key)
}
}
}
}
// Usage example
let cache = ExpirableCache<String, String>(expirationInterval: 10.0)
cache["key"] = "value"
print(cache["key"]) // Output: value
sleep(11)
print(cache["key"]) // Output: nil
```
let cache = ExpirableCache<String, String>() // missing argument for parameter 'expirationInterval' in callThread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
typealias Key = CacheKey
typealias Value = CacheValue
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() {
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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
typealias Key = CacheKey
typealias Value = CacheValue
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() {
cache.removeValue(forKey: key)
return nil
}
return value
}
}
// Usage example
let cache = ExpirableCache<String, String>()
cache.put(value: "Hello", key: "greeting", expiration: 10)
print(cache["greeting"]) // Output: Hello
sleep(11)
print(cache["greeting"]) // Output: 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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
typealias Key = CacheKey
typealias Value = CacheValue
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 }
guard expiration > Date() else { return nil }
return value
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set {
if let value = newValue {
put(value: value, 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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
typealias Key = CacheKey
typealias Value = CacheValue
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 }
guard expiration > Date() else { return nil }
return value
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set {
if let value = newValue {
put(value: value, key: key, expiration: 3600)
} else {
cache[key] = nil
}
}
}
}
// Example usage
let cache = ExpirableCache<String, String>()
cache["key"] = "value"
print(cache["key"]) // Output: value
sleep(2)
print(cache["key"]) // Output: 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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
typealias Key = CacheKey
typealias Value = CacheValue
private var cache: [Key: (value: Value, expiration: Date)]
init() {
self.cache = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date().addingTimeInterval(expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expirationDate) = cache[key] else { return nil }
if expirationDate < Date() {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set {
if let value = newValue {
put(value: value, key: key, expiration: 3600) // 1 hour expiration
} 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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
typealias Key = CacheKey
typealias Value = CacheValue
private var cache: [Key: (value: Value, expiration: Date)]
init() {
self.cache = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date().addingTimeInterval(expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expirationDate) = cache[key] else { return nil }
if expirationDate < Date() {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set {
if let value = newValue {
put(value: value, key: key, expiration: 3600) // 1 hour expiration
} 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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
typealias Key = CacheKey
typealias Value = CacheValue
private var cache: [Key: CacheValue] = [:]
private var expirationTimes: [Key: TimeInterval] = [:]
func put(value: CacheValue, key: CacheKey, expiration: TimeInterval) {
cache[key] = value
expirationTimes[key] = Date().timeIntervalSince1970 + expiration
}
func get(key: CacheKey) -> CacheValue? {
guard let value = cache[key], let expirationTime = expirationTimes[key] else {
return nil
}
if expirationTime < Date().timeIntervalSince1970 {
cache.removeValue(forKey: key)
expirationTimes.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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
typealias Key = CacheKey
typealias Value = CacheValue
private var cache: [Key: CacheValue] = [:]
private var expirationTimes: [Key: TimeInterval] = [:]
func put(value: CacheValue, key: CacheKey, expiration: TimeInterval) {
cache[key] = value
expirationTimes[key] = Date().timeIntervalSince1970 + expiration
}
func get(key: CacheKey) -> CacheValue? {
guard let value = cache[key], let expirationTime = expirationTimes[key] else {
return nil
}
if expirationTime < Date().timeIntervalSince1970 {
cache.removeValue(forKey: key)
expirationTimes.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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
typealias Key = CacheKey
typealias Value = CacheValue
private var cache: [Key: (value: Value, expiration: Date)]
init() {
self.cache = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expirationDate) = cache[key] else {
return nil
}
if expirationDate < Date() {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 60 * 60) // 1 hour expiration
} 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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
typealias Key = CacheKey
typealias Value = CacheValue
private var cache: [Key: (value: Value, expiration: Date)]
init() {
self.cache = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expirationDate) = cache[key] else {
return nil
}
if expirationDate < Date() {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 60 * 60) // 1 hour expiration
} 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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
private var cache: [CacheKey: CacheValue] = [:]
private var expirationTimes: [CacheKey: TimeInterval] = [:]
func put(value: CacheValue, key: CacheKey, expiration: TimeInterval) {
cache[key] = value
expirationTimes[key] = Date().timeIntervalSince1970 + expiration
}
func get(key: CacheKey) -> CacheValue? {
if let expirationTime = expirationTimes[key], expirationTime < Date().timeIntervalSince1970 {
cache.removeValue(forKey: key)
expirationTimes.removeValue(forKey: key)
return nil
}
return cache[key]
}
subscript(key: CacheKey) -> CacheValue? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 3600) // 1 hour expiration time
} else {
cache.removeValue(forKey: key)
expirationTimes.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
private var cache: [CacheKey: CacheValue] = [:]
private var expirationTimes: [CacheKey: TimeInterval] = [:]
func put(value: CacheValue, key: CacheKey, expiration: TimeInterval) {
cache[key] = value
expirationTimes[key] = Date().timeIntervalSince1970 + expiration
}
func get(key: CacheKey) -> CacheValue? {
if let expirationTime = expirationTimes[key], expirationTime < Date().timeIntervalSince1970 {
cache.removeValue(forKey: key)
expirationTimes.removeValue(forKey: key)
return nil
}
return cache[key]
}
subscript(key: CacheKey) -> CacheValue? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 3600) // 1 hour expiration time
} else {
cache.removeValue(forKey: key)
expirationTimes.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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
private var cache: [CacheKey: CacheValue] = [:]
private var expirationTimes: [CacheKey: TimeInterval] = [:]
func put(value: CacheValue, key: CacheKey, expiration: TimeInterval) {
cache[key] = value
expirationTimes[key] = Date().timeIntervalSince1970 + expiration
}
func get(key: CacheKey) -> CacheValue? {
if let expirationTime = expirationTimes[key], expirationTime > Date().timeIntervalSince1970 {
return cache[key]
} else {
cache.removeValue(forKey: key)
expirationTimes.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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
private var cache: [CacheKey: CacheValue] = [:]
private var expirationTimes: [CacheKey: TimeInterval] = [:]
func put(value: CacheValue, key: CacheKey, expiration: TimeInterval) {
cache[key] = value
expirationTimes[key] = Date().timeIntervalSince1970 + expiration
}
func get(key: CacheKey) -> CacheValue? {
if let expirationTime = expirationTimes[key], expirationTime > Date().timeIntervalSince1970 {
return cache[key]
} else {
cache.removeValue(forKey: key)
expirationTimes.removeValue(forKey: key)
return nil
}
}
}
// Example usage
let cache = ExpirableCache<String, Int>()
cache.put(value: 10, key: "key1", expiration: 10)
print(cache["key1"]) // Output: Optional(10)
sleep(11)
print(cache["key1"]) // Output: 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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
private var cache: [CacheKey: CacheValue] = [:]
private var expirationTimes: [CacheKey: TimeInterval] = [:]
func put(value: CacheValue, key: CacheKey, expiration: TimeInterval) {
cache[key] = value
expirationTimes[key] = Date().timeIntervalSince1970 + expiration
}
func get(key: CacheKey) -> CacheValue? {
if let expirationTime = expirationTimes[key] {
if expirationTime > Date().timeIntervalSince1970 {
return cache[key]
} else {
cache[key] = nil
expirationTimes[key] = nil
}
}
return nil
}
subscript(key: CacheKey) -> CacheValue? {
get {
return get(key: key)
}
set {
put(value: newValue!, key: key, expiration: 3600)
}
}
}```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<CacheKey: Hashable, CacheValue>: ExpirableCacheProtocol {
private var cache: [CacheKey: CacheValue] = [:]
private var expirationTimes: [CacheKey: TimeInterval] = [:]
func put(value: CacheValue, key: CacheKey, expiration: TimeInterval) {
cache[key] = value
expirationTimes[key] = Date().timeIntervalSince1970 + expiration
}
func get(key: CacheKey) -> CacheValue? {
if let expirationTime = expirationTimes[key] {
if expirationTime > Date().timeIntervalSince1970 {
return cache[key]
} else {
cache[key] = nil
expirationTimes[key] = nil
}
}
return nil
}
subscript(key: CacheKey) -> CacheValue? {
get {
return get(key: key)
}
set {
put(value: newValue!, key: key, expiration: 3600)
}
}
}
// Usage example
let cache = ExpirableCache<String, Int>()
cache["key"] = 10
print(cache["key"]) // Output: Optional(10)
sleep(2)
print(cache["key"]) // Output: nil
```
Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var encryptedData = Data()
let keyData = key.data(using: .utf8)!
let stringData = string.data(using: .utf8)!
let keyLength = keyData.count
let stringLength = stringData.count
for i in 0..<stringLength {
let keyIndex = i % keyLength
let keyByte = keyData[keyIndex]
let stringByte = stringData[i]
let encryptedByte = stringByte ^ keyByte
encryptedData.append(encryptedByte)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
var decryptedString = ""
let keyData = key.data(using: .utf8)!
let keyLength = keyData.count
let dataLength = data.count
for i in 0..<dataLength {
let keyIndex = i % keyLength
let keyByte = keyData[keyIndex]
let dataByte = data[i]
let decryptedByte = dataByte ^ keyByte
decryptedString.append(Character(UnicodeScalar(decryptedByte)))
}
return decryptedString
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var encryptedData = Data()
let keyData = key.data(using: .utf8)!
let stringData = string.data(using: .utf8)!
let keyLength = keyData.count
let stringLength = stringData.count
for i in 0..<stringLength {
let keyIndex = i % keyLength
let keyByte = keyData[keyIndex]
let stringByte = stringData[i]
let encryptedByte = stringByte ^ keyByte
encryptedData.append(encryptedByte)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
var decryptedString = ""
let keyData = key.data(using: .utf8)!
let keyLength = keyData.count
let dataLength = data.count
for i in 0..<dataLength {
let keyIndex = i % keyLength
let keyByte = keyData[keyIndex]
let dataByte = data[i]
let decryptedByte = dataByte ^ keyByte
decryptedString.append(Character(UnicodeScalar(decryptedByte)))
}
return decryptedString
}
}
// Example usage
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedText = encryptor.decrypt(encryptedData, key)
print(decryptedText) // Output: Hello, World!
```
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 (index, byte) in data.enumerated() {
let keyByte = keyData[index % keyData.count]
let encryptedByte = byte ^ keyByte
encryptedData.append(encryptedByte)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data()
for (index, byte) in data.enumerated() {
let keyByte = keyData[index % keyData.count]
let decryptedByte = byte ^ keyByte
decryptedData.append(decryptedByte)
}
return String(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 (index, byte) in data.enumerated() {
let keyByte = keyData[index % keyData.count]
let encryptedByte = byte ^ keyByte
encryptedData.append(encryptedByte)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data()
for (index, byte) in data.enumerated() {
let keyByte = keyData[index % keyData.count]
let decryptedByte = byte ^ keyByte
decryptedData.append(decryptedByte)
}
return String(data: decryptedData, encoding: .utf8)!
}
}
// Example usage
let encryptor = Encryptor()
let plainText = "Hello, world!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedText = encryptor.decrypt(encryptedData, key)
print(decryptedText) // Output: Hello, world!
```
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)!
}
}
// Example usage
let encryptor = Encryptor()
let encryptedData = encryptor.encrypt("Hello, World!", "secretkey")
let decryptedString = encryptor.decrypt(encryptedData, "secretkey")
print(decryptedString) // Output: Hello, World!
```
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)!
}
}
// Example usage:
let encryptor = Encryptor()
let encryptedData = encryptor.encrypt("Hello, World!", "secretkey")
let decryptedString = encryptor.decrypt(encryptedData, "secretkey")
print(decryptedString) // Output: Hello, World!
```
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, byte) in data.enumerated() {
encryptedData[i] = byte ^ 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, byte) in data.enumerated() {
decryptedData[i] = byte ^ 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, byte) in data.enumerated() {
encryptedData[i] = byte ^ 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, byte) in data.enumerated() {
decryptedData[i] = byte ^ keyData[i % keyData.count]
}
return String(data: decryptedData, encoding: .utf8)!
}
}
// Example usage
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secretkey"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedText = encryptor.decrypt(encryptedData, key)
print(decryptedText) // Output: Hello, World!
```
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let stringData = string.data(using: .utf8)!
var encryptedData = Data(count: stringData.count)
for (i, byte) in stringData.enumerated() {
encryptedData[i] = byte ^ 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, byte) in data.enumerated() {
decryptedData[i] = byte ^ 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 keyData = key.data(using: .utf8)!
let stringData = string.data(using: .utf8)!
var encryptedData = Data(count: stringData.count)
for (i, byte) in stringData.enumerated() {
encryptedData[i] = byte ^ 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, byte) in data.enumerated() {
decryptedData[i] = byte ^ 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 {
var encryptedData = Data()
let keyData = key.data(using: .utf8)!
let stringData = string.data(using: .utf8)!
let keyLength = keyData.count
let stringLength = stringData.count
var keyIndex = 0
for i in 0..<stringLength {
let keyByte = keyData[keyIndex % keyLength]
let stringByte = stringData[i]
let encryptedByte = stringByte ^ keyByte
encryptedData.append(encryptedByte)
keyIndex += 1
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let keyLength = keyData.count
var decryptedString = ""
var keyIndex = 0
for i in 0..<data.count {
let keyByte = keyData[keyIndex % keyLength]
let encryptedByte = data[i]
let decryptedByte = encryptedByte ^ keyByte
decryptedString.append(Character(UnicodeScalar(decryptedByte)))
keyIndex += 1
}
return decryptedString
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var encryptedData = Data()
let keyData = key.data(using: .utf8)!
let stringData = string.data(using: .utf8)!
let keyLength = keyData.count
let stringLength = stringData.count
var keyIndex = 0
for i in 0..<stringLength {
let keyByte = keyData[keyIndex % keyLength]
let stringByte = stringData[i]
let encryptedByte = stringByte ^ keyByte
encryptedData.append(encryptedByte)
keyIndex += 1
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let keyLength = keyData.count
var decryptedString = ""
var keyIndex = 0
for i in 0..<data.count {
let keyByte = keyData[keyIndex % keyLength]
let encryptedByte = data[i]
let decryptedByte = encryptedByte ^ keyByte
decryptedString.append(Character(UnicodeScalar(decryptedByte)))
keyIndex += 1
}
return decryptedString
}
}
```
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 (index, byte) in data.enumerated() {
encryptedData[index] = byte ^ keyData[index % keyData.count]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data(count: data.count)
for (index, byte) in data.enumerated() {
decryptedData[index] = byte ^ keyData[index % keyData.count]
}
return String(data: decryptedData, encoding: .utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
var encryptedData = Data(count: data.count)
for (index, byte) in data.enumerated() {
encryptedData[index] = byte ^ keyData[index % keyData.count]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data(count: data.count)
for (index, byte) in data.enumerated() {
decryptedData[index] = byte ^ keyData[index % keyData.count]
}
return String(data: decryptedData, encoding: .utf8)!
}
}
// Example usage
let encryptor = Encryptor()
let plainText = "Hello, world!"
let key = "secretkey"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedText = encryptor.decrypt(encryptedData, key)
print(decryptedText) // Output: Hello, world!
```
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let stringData = string.data(using: .utf8)!
var encryptedData = Data(count: stringData.count)
for i in 0..<stringData.count {
encryptedData[i] = stringData[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 keyData = key.data(using: .utf8)!
let stringData = string.data(using: .utf8)!
var encryptedData = Data(count: stringData.count)
for i in 0..<stringData.count {
encryptedData[i] = stringData[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)!
}
}
// Example usage
let encryptor = Encryptor()
let encryptedData = encryptor.encrypt("Hello, World!", "secretkey")
let decryptedString = encryptor.decrypt(encryptedData, "secretkey")
print(decryptedString) // Output: Hello, World!
```
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let stringData = string.data(using: .utf8)!
let encryptedData = NSMutableData()
for (index, char) in stringData.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char ^ keyChar
encryptedData.append(Data(bytes: [encryptedChar]))
}
return encryptedData as Data
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = NSMutableData()
for (index, char) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = char ^ keyChar
decryptedData.append(Data(bytes: [decryptedChar]))
}
return String(data: decryptedData as Data, encoding: .utf8) ?? ""
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let stringData = string.data(using: .utf8)!
let encryptedData = NSMutableData()
for (index, char) in stringData.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char ^ keyChar
encryptedData.append(Data(bytes: [encryptedChar]))
}
return encryptedData as Data
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = NSMutableData()
for (index, char) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = char ^ keyChar
decryptedData.append(Data(bytes: [decryptedChar]))
}
return String(data: decryptedData as Data, encoding: .utf8) ?? ""
}
}
// Example usage
let encryptor = Encryptor()
let encryptedData = encryptor.encrypt("Hello, world!", "secretkey")
let decryptedString = encryptor.decrypt(encryptedData, "secretkey")
print(decryptedString) // Output: Hello, world!
```
encryptedData.append(Data(bytes: [encryptedChar])) // 'init(bytes:)' is deprecated: use `init(_:)` insteaddecryptedData.append(Data(bytes: [decryptedChar])) // 'init(bytes:)' is deprecated: use `init(_:)` insteadprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date = Date()
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let timeSinceLastRequest = currentTime.timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= timeInterval {
requestCount = 0
}
if requestCount < maxRequests {
requestCount += 1
lastRequestTime = currentTime
return true
} else {
return false
}
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date = Date()
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let timeSinceLastRequest = currentTime.timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= timeInterval {
requestCount = 0
}
if requestCount < maxRequests {
requestCount += 1
lastRequestTime = currentTime
return true
} else {
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 requestCount = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if requestCount < maxRequests {
requestCount += 1
lastRequestTime = Date()
return true
} else if let lastRequestTime = lastRequestTime, Date().timeIntervalSince(lastRequestTime) >= timeInterval {
requestCount = 1
lastRequestTime = Date()
return true
} else {
return false
}
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if requestCount < maxRequests {
requestCount += 1
lastRequestTime = Date()
return true
} else if let lastRequestTime = lastRequestTime, Date().timeIntervalSince(lastRequestTime) >= timeInterval {
requestCount = 1
lastRequestTime = Date()
return true
} else {
return false
}
}
}
// Example usage
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 10.0)
for _ in 0..<10 {
if rateLimiter.allowRequest() {
print("Request allowed")
} else {
print("Request denied")
}
}
```
init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'lastRequestTime = Date() // cannot assign to value: 'lastRequestTime' is a 'let' constantThread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if requestCount < maxRequests {
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= timeInterval {
requestCount += 1
lastRequestTime = Date()
return true
}
} else {
requestCount += 1
lastRequestTime = Date()
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 requestCount: Int = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if requestCount < maxRequests {
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= timeInterval {
requestCount += 1
lastRequestTime = Date()
return true
}
} else {
requestCount += 1
lastRequestTime = Date()
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'lastRequestTime = Date() // cannot assign to value: 'lastRequestTime' is a 'let' constantThread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
if requestCount < maxRequests {
requestCount += 1
return true
} else {
return false
}
} else {
requestCount = 1
lastRequestTime = Date()
return true
}
} else {
requestCount = 1
lastRequestTime = Date()
return true
}
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
if requestCount < maxRequests {
requestCount += 1
return true
} else {
return false
}
} else {
requestCount = 1
lastRequestTime = Date()
return true
}
} else {
requestCount = 1
lastRequestTime = Date()
return true
}
}
}
```
init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'lastRequestTime = Date() // cannot assign to value: 'lastRequestTime' is a 'let' constantThread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if requestCount < maxRequests {
requestCount += 1
lastRequestTime = Date()
return true
} else {
if let lastRequestTime = lastRequestTime, Date().timeIntervalSince(lastRequestTime) >= timeInterval {
requestCount = 1
lastRequestTime = Date()
return true
} else {
return false
}
}
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if requestCount < maxRequests {
requestCount += 1
lastRequestTime = Date()
return true
} else {
if let lastRequestTime = lastRequestTime, Date().timeIntervalSince(lastRequestTime) >= timeInterval {
requestCount = 1
lastRequestTime = Date()
return true
} else {
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'lastRequestTime = Date() // cannot assign to value: 'lastRequestTime' is a 'let' constantThread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = currentTime.timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
if requestCount < maxRequests {
requestCount += 1
lastRequestTime = currentTime
return true
} else {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
return true
}
} else {
lastRequestTime = currentTime
return true
}
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = currentTime.timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
if requestCount < maxRequests {
requestCount += 1
lastRequestTime = currentTime
return true
} else {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
return true
}
} else {
lastRequestTime = currentTime
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'lastRequestTime = currentTime // cannot assign to value: 'lastRequestTime' is a 'let' constantlastRequestTime = currentTime // cannot assign to value: 'lastRequestTime' is a 'let' constantThread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if requestCount < maxRequests {
if let lastRequestTime = lastRequestTime {
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime >= timeInterval {
requestCount += 1
lastRequestTime = Date()
return true
}
} else {
requestCount += 1
lastRequestTime = Date()
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 requestCount = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if requestCount < maxRequests {
if let lastRequestTime = lastRequestTime {
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime >= timeInterval {
requestCount += 1
lastRequestTime = Date()
return true
}
} else {
requestCount += 1
lastRequestTime = Date()
return true
}
}
return false
}
}
// Example usage:
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 10.0)
for _ in 0..<10 {
if rateLimiter.allowRequest() {
print("Request allowed")
} else {
print("Request denied")
}
}
```
init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'lastRequestTime = Date() // cannot assign to value: 'lastRequestTime' is a 'let' constantThread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime < timeInterval {
if requestCount < maxRequests {
requestCount += 1
return true
} else {
return false
}
} else {
requestCount = 1
lastRequestTime = Date()
return true
}
} else {
lastRequestTime = Date()
requestCount = 1
return true
}
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime < timeInterval {
if requestCount < maxRequests {
requestCount += 1
return true
} else {
return false
}
} else {
requestCount = 1
lastRequestTime = Date()
return true
}
} else {
lastRequestTime = Date()
requestCount = 1
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'lastRequestTime = Date() // cannot assign to value: 'lastRequestTime' is a 'let' constantThread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
if requestCount < maxRequests {
requestCount += 1
return true
} else {
return false
}
} else {
requestCount = 1
lastRequestTime = Date()
return true
}
} else {
requestCount = 1
lastRequestTime = Date()
return true
}
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
if requestCount < maxRequests {
requestCount += 1
return true
} else {
return false
}
} else {
requestCount = 1
lastRequestTime = Date()
return true
}
} else {
requestCount = 1
lastRequestTime = Date()
return true
}
}
}
```
init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'lastRequestTime = Date() // cannot assign to value: 'lastRequestTime' is a 'let' constantThread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date = Date()
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let timeSinceLastRequest = currentTime.timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= timeInterval {
requestCount = 0
lastRequestTime = currentTime
}
if requestCount < maxRequests {
requestCount += 1
return true
} else {
return false
}
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date = Date()
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
let timeSinceLastRequest = currentTime.timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= timeInterval {
requestCount = 0
lastRequestTime = currentTime
}
if requestCount < maxRequests {
requestCount += 1
return true
} else {
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 lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```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()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { 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 = 0
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int = 0
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```
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.threadSafeCounterQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
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.threadSafeCounterQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
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
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```
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()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```
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.threadSafeCounterQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
self.value += 1
}
}
func currentValue() -> Int {
return queue.sync {
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.threadSafeCounterQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
self.value += 1
}
}
func currentValue() -> Int {
return queue.sync {
self.value
}
}
}
// Example usage:
let counter = ThreadSafeCounter(value: 0)
counter.increment()
print(counter.currentValue()) // Output: 1
```
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.counterQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
value += 1
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = 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: "com.example.counterQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
value += 1
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = value
}
return result
}
}
// 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.counterQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
value += 1
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = 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()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```
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()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
class ThreadSafeCounterWithAtomic: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
class ThreadSafeCounterWithDispatchQueue: ThreadSafeCounterProtocol {
private var value: Int = 0
private let queue = DispatchQueue(label: "com.example.threadSafeCounterQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.async {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = self.value
}
return result
}
}
class ThreadSafeCounterWithOperationQueue: ThreadSafeCounterProtocol {
private var value: Int = 0
private let queue = OperationQueue()
init(value: Int) {
self.value = value
}
func increment() {
let operation = BlockOperation {
self.value += 1
}
queue.addOperation(operation)
}
func currentValue() -> Int {
var result: Int = 0
let operation = BlockOperation {
result = self.value
}
queue.addOperation(operation)
queue.waitUntilAllOperationsAreFinished()
return result
}
}
class ThreadSafeCounterWithSemaphore: ThreadSafeCounterProtocol {
private var value: Int = 0
private let semaphore = DispatchSemaphore(value: 1)
init(value: Int) {
self.value = value
}
func increment() {
semaphore.wait()
defer { semaphore.signal() }
value += 1
}
func currentValue() -> Int {
semaphore.wait()
defer { semaphore.signal() }
return value
}
}
class ThreadSafeCounterWithMutex: ThreadSafeCounterProtocol {
private var value: Int = 0
private let mutex = Mutex()
init(value: Int) {
self.value = value
}
func increment() {
mutex.lock()
defer { mutex.unlock() }
value += 1
}
func currentValue() -> Int {
mutex.lock()
defer { mutex.unlock() }
return value
}
}
class ThreadSafeCounterWithRWLock: ThreadSafeCounterProtocol {
private var value: Int = 0
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
class ThreadSafeCounterWithRWLockWithAtomic: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// 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 = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithDispatchQueue: ThreadSafeCounterProtocol {
private var value: Int = 0
private let queue = DispatchQueue(label: "com.example.threadSafeCounterQueue")
init(value: Int) {
self.value = value
}
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 ThreadSafeCounterWithOperationQueue: ThreadSafeCounterProtocol {
private var value: Int = 0
private let queue = OperationQueue()
init(value: Int) {
self.value = value
}
func increment() {
let operation = BlockOperation {
self.value += 1
}
queue.addOperation(operation)
}
func currentValue() -> Int {
var result: Int = 0
let operation = BlockOperation {
result = self.value
}
queue.addOperation(operation)
queue.waitUntilAllOperationsAreFinished()
return result
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithSemaphore: ThreadSafeCounterProtocol {
private var value: Int = 0
private let semaphore = DispatchSemaphore(value: 1)
init(value: Int) {
self.value = value
}
func increment() {
semaphore.wait()
defer { semaphore.signal() }
value += 1
}
func currentValue() -> Int {
semaphore.wait()
defer { semaphore.signal() }
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithMutex: ThreadSafeCounterProtocol {
private var value: Int = 0
private let mutex = Mutex()
init(value: Int) {
self.value = value
}
func increment() {
mutex.lock()
defer { mutex.unlock() }
value += 1
}
func currentValue() -> Int {
mutex.lock()
defer { mutex.unlock() }
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithRWLock: ThreadSafeCounterProtocol {
private var value: Int = 0
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithRWLockWithAtomic: ThreadSafeCounterProtocol {
private var value: Int = 0
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounterWithRWLockWithDispatchQueue: ThreadSafeCounterProtocol {
private var value: Int = 0
private let queue = DispatchQueue(label: "com.example.threadSafeCounterQueue")
init(value: Int) {
self.value = value
}
func increment() {
queue.async {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = self.value
}
init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithAtomic'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithDispatchQueue'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithOperationQueue'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithSemaphore'private let mutex = Mutex() // cannot find 'Mutex' in scopeinit(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithMutex'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithRWLock'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounterWithRWLockWithAtomic'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()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// 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()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// 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()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// 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()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// 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()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
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<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage:
let pipeline = Pipeline(value: 1)
.pipe { $0 * 2 }
.pipe { $0 + 3 }
.pipe { $0.description }
print(pipeline.execute()) // Output: "5"
```
init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage:
let pipeline = Pipeline(value: 10)
.pipe { $0 * 2 }
.pipe { $0 + 5 }
.pipe { $0.description }
print(pipeline.execute()) // Output: "25"
```
init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage:
let pipeline = Pipeline(value: 5)
.pipe { $0 * 2 }
.pipe { $0 + 3 }
.pipe { $0 / 2 }
.execute()
print(pipeline) // Output: 7.0
```
init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage:
let pipeline = Pipeline(value: 10)
.pipe { $0 * 2 }
.pipe { $0 + 5 }
.pipe { $0 / 3 }
print(pipeline.execute()) // Output: 15
```
init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage:
let pipeline = Pipeline<Int>(value: 10)
.pipe { $0 * 2 }
.pipe { $0 + 5 }
.pipe { $0 / 3 }
let result = pipeline.execute() // result will be 7
```
init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage
let pipeline = Pipeline<Int>(value: 5)
.pipe { $0 * 2 }
.pipe { $0 + 3 }
.execute()
print(pipeline) // Output: 13
```
init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage:
let pipeline = Pipeline<Int>(value: 5)
.pipe { $0 * 2 }
.pipe { $0 + 3 }
.execute()
print(pipeline) // Output: 13
```
init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage:
let pipeline = Pipeline(value: 1)
.pipe { $0 * 2 }
.pipe { $0 + 3 }
.pipe { String($0) }
print(pipeline.execute()) // Output: "5"
```
init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage:
let pipeline = Pipeline<Int>(value: 5)
.pipe { $0 * 2 }
.pipe { $0 + 3 }
.pipe { $0 / 2 }
let result = pipeline.execute()
print(result) // Output: 8
```
init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage:
let pipeline = Pipeline<Int>(value: 10)
.pipe { $0 * 2 }
.pipe { $0 + 5 }
.pipe { $0 / 3 }
print(pipeline.execute()) // Output: 7
```
init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'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> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get {
return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get {
return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// Example usage:
let observableProperty = ObservableProperty(value: 0)
let observer1 = observableProperty.subscribe { value in
print("Observer 1: \(value)")
}
let observer2 = observableProperty.subscribe { value in
print("Observer 2: \(value)")
}
observableProperty.value = 1 // Output: Observer 1: 1, Observer 2: 1
observableProperty.unsubscribe(observer1)
observableProperty.value = 2 // Output: Observer 2: 2
```
var value: Value { // invalid redeclaration 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 value: Value
private var observers: [UUID: (Value) -> Void] = [:]
init(value: Value) {
self.value = value
}
var value: Value {
get { return self.value }
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
self.observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
self.observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in self.observers.values {
observer(self.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 value: Value
private var observers: [UUID: (Value) -> Void] = [:]
init(value: Value) {
self.value = value
}
var value: Value {
get { return self.value }
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
self.observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
self.observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in self.observers.values {
observer(self.value)
}
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observer1 = observable.subscribe { value in
print("Observer 1: \(value)")
}
let observer2 = observable.subscribe { value in
print("Observer 2: \(value)")
}
observable.value = 1
// Output:
// Observer 1: 1
// Observer 2: 1
observable.unsubscribe(observer1)
observable.value = 2
// Output:
// Observer 2: 2
```
var value: Value { // invalid redeclaration 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 value: Value {
get { return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get { return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observer1 = observable.subscribe { value in
print("Observer 1: \(value)")
}
let observer2 = observable.subscribe { value in
print("Observer 2: \(value)")
}
observable.value = 1 // Output: Observer 1: 1, Observer 2: 1
observable.unsubscribe(observer1)
observable.value = 2 // Output: Observer 2: 2
```
var value: Value { // invalid redeclaration 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 value: Value {
get {
return self.value
}
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
self.observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
self.observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in self.observers.values {
observer(self.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 value: Value {
get {
return self.value
}
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
self.observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
self.observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in self.observers.values {
observer(self.value)
}
}
}
// Example usage
let observableProperty = ObservableProperty(value: 0)
let observer1 = observableProperty.subscribe { value in
print("Observer 1: \(value)")
}
let observer2 = observableProperty.subscribe { value in
print("Observer 2: \(value)")
}
observableProperty.value = 1
// Output:
// Observer 1: 1
// Observer 2: 1
observableProperty.unsubscribe(observer1)
observableProperty.value = 2
// Output:
// Observer 2: 2
```
var value: Value { // invalid redeclaration 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 value: Value {
get {
return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get {
return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// Example usage:
let observableProperty = ObservableProperty(value: 0)
let observer1 = observableProperty.subscribe { value in
print("Observer 1: \(value)")
}
let observer2 = observableProperty.subscribe { value in
print("Observer 2: \(value)")
}
observableProperty.value = 1
// Output:
// Observer 1: 1
// Observer 2: 1
observableProperty.unsubscribe(observer1)
observableProperty.value = 2
// Output:
// Observer 2: 2
```
var value: Value { // invalid redeclaration 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 value: Value {
get {
return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get {
return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// Example usage:
let observableProperty = ObservableProperty(value: 0)
let observer1 = observableProperty.subscribe { value in
print("Observer 1: \(value)")
}
let observer2 = observableProperty.subscribe { value in
print("Observer 2: \(value)")
}
observableProperty.value = 1 // Output: Observer 1: 1, Observer 2: 1
observableProperty.unsubscribe(observer1)
observableProperty.value = 2 // Output: Observer 2: 2
```
var value: Value { // invalid redeclaration 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 value: Value {
get {
return self.value
}
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
self.observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
self.observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in self.observers.values {
observer(self.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 value: Value {
get {
return self.value
}
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
self.observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
self.observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in self.observers.values {
observer(self.value)
}
}
}
// Example usage:
let observableProperty = ObservableProperty(value: 0)
let observer1 = observableProperty.subscribe { value in
print("Observer 1: \(value)")
}
let observer2 = observableProperty.subscribe { value in
print("Observer 2: \(value)")
}
observableProperty.value = 1 // Output: Observer 1: 1, Observer 2: 1
observableProperty.unsubscribe(observer1)
observableProperty.value = 2 // Output: Observer 2: 2
```
var value: Value { // invalid redeclaration 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 value: Value {
get { return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get { return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observer1 = observable.subscribe { value in
print("Observer 1: \(value)")
}
let observer2 = observable.subscribe { value in
print("Observer 2: \(value)")
}
observable.value = 1
// Output:
// Observer 1: 1
// Observer 2: 1
observable.unsubscribe(observer1)
observable.value = 2
// Output:
// Observer 2: 2
```
var value: Value { // invalid redeclaration 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 value: Value {
get {
return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get {
return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observer1 = observable.subscribe { value in
print("Observer 1: \(value)")
}
let observer2 = observable.subscribe { value in
print("Observer 2: \(value)")
}
observable.value = 1 // Output: Observer 1: 1, Observer 2: 1
observable.unsubscribe(observer1)
observable.value = 2 // Output: Observer 2: 2
```
var value: Value { // invalid redeclaration 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 value: Value {
get { return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get { return self.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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// Example usage:
let observableProperty = ObservableProperty(value: 0)
let observer1 = observableProperty.subscribe { value in
print("Observer 1: \(value)")
}
let observer2 = observableProperty.subscribe { value in
print("Observer 2: \(value)")
}
observableProperty.value = 1 // Output: Observer 1: 1, Observer 2: 1
observableProperty.unsubscribe(observer1)
observableProperty.value = 2 // Output: Observer 2: 2
```
var value: Value { // invalid redeclaration 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<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
wrappedValue = wrappedValue.clamped(range)
}
}
let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue.clamped(range)
self.range = range
}
}
extension Comparable {
func clamped(_ range: ClosedRange<Self>) -> Self {
return min(max(self, range.lowerBound), range.upperBound)
}
}
struct Person {
@Clamped(0...100)
var age: Int
@Clamped(0.0...1.0)
var height: Double
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
wrappedValue = wrappedValue.clamped(range)
}
}
let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue.clamped(range)
self.range = range
}
}
// Extension to clamp a value within a specified range.
extension Comparable {
func clamped(_ range: ClosedRange<Self>) -> Self {
return min(max(self, range.lowerBound), range.upperBound)
}
}
// Example usage:
struct Person {
@Clamped(0...100)
var age: Int
@Clamped(0.0...1.0)
var height: Double
}
let person = Person(age: 150, height: 2.5)
print(person.age) // Output: 100
print(person.height) // Output: 1.0
```
@Clamped(0...100) // missing argument for parameter 'wrappedValue' in call@Clamped(0.0...1.0) // missing argument for parameter 'wrappedValue' in callprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
wrappedValue = wrappedValue.clamped(to: range)
}
}
let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
extension Comparable {
func clamped(to range: ClosedRange<Self>) -> Self {
return min(max(self, range.lowerBound), range.upperBound)
}
}
struct Person {
@Clamped var age: Int = 0...120
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
wrappedValue = wrappedValue.clamped(to: range)
}
}
let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Extension to clamp a value within a specified range.
extension Comparable {
func clamped(to range: ClosedRange<Self>) -> Self {
return min(max(self, range.lowerBound), range.upperBound)
}
}
// Example usage:
struct Person {
@Clamped var age: Int = 0...120
}
var person = Person()
person.age = 150 // Clamped to 120
print(person.age) // Output: 120
```
@Clamped var age: Int = 0...120 // missing argument for parameter 'wrappedValue' in property wrapper initializer; add 'wrappedValue' and 'wrappedValue' arguments in '@Clamped(...)'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.range = range
self.wrappedValue = wrappedValue
}
}
struct Person {
@Clamped(wrappedValue: 18, 18...100) var age: 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<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.range = range
self.wrappedValue = wrappedValue
}
}
// Example usage:
struct Person {
@Clamped(wrappedValue: 18, 18...100) var age: Int
}
let person = Person()
person.age = 15
print(person.age) // Output: 18
person.age = 105
print(person.age) // Output: 100
```
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Wrapped>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
wrappedValue = wrappedValue.clamped(to: range)
}
}
let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
extension Comparable {
func clamped(to range: ClosedRange<Self>) -> Self {
return min(max(self, range.lowerBound), range.upperBound)
}
}
struct Person {
@Clamped(wrappedValue: 18, 18...100)
var age: Int
@Clamped(wrappedValue: 1.5, 1.5...2.5)
var height: Double
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Wrapped>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
wrappedValue = wrappedValue.clamped(to: range)
}
}
let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Extension to add clamping functionality to any Comparable type.
extension Comparable {
func clamped(to range: ClosedRange<Self>) -> Self {
return min(max(self, range.lowerBound), range.upperBound)
}
}
// Example usage:
struct Person {
@Clamped(wrappedValue: 18, 18...100)
var age: Int
@Clamped(wrappedValue: 1.5, 1.5...2.5)
var height: Double
}
let person = Person()
person.age = 15 // Clamped to 18
person.height = 2.6 // Clamped to 2.5
```
struct Clamped<Wrapped>: ClampedProtocol { // type 'Clamped<Wrapped>' does not conform to protocol 'ClampedProtocol'wrappedValue = wrappedValue.clamped(to: range) // value of type 'Wrapped' has no member 'clamped'let range: ClosedRange<Wrapped> // type 'Wrapped' does not conform to protocol 'Comparable'init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) { // type 'Wrapped' does not conform to protocol 'Comparable'self.wrappedValue = wrappedValue.clamped(to: range) // value of type 'Wrapped' has no member 'clamped'@Clamped(wrappedValue: 18, 18...100) // generic parameter 'Wrapped' could not be inferred@Clamped(wrappedValue: 1.5, 1.5...2.5) // generic parameter 'Wrapped' could not be inferred@Clamped(0...10) var value: Int = 0 // generic parameter 'Wrapped' could not be inferredprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
private let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue
self.range = range
}
}
struct Example {
@Clamped(wrappedValue: 0, 0...100) var value: Int
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
private let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue
self.range = range
}
}
// Example usage:
struct Example {
@Clamped(wrappedValue: 0, 0...100) var value: Int
}
let example = Example()
example.value = 50 // value is 50
example.value = -10 // value is 0
example.value = 110 // value is 100
```
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
private let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.range = range
self.wrappedValue = wrappedValue
}
}
struct Example {
@Clamped(wrappedValue: 0, 0...100) var value: Int
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
private let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.range = range
self.wrappedValue = wrappedValue
}
}
// Example usage:
struct Example {
@Clamped(wrappedValue: 0, 0...100) var value: Int
}
var example = Example()
example.value = 50 // value is 50
example.value = -10 // value is 0
example.value = 110 // value is 100
```
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
private let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue
self.range = range
}
}
struct Person {
@Clamped(wrappedValue: 18, 18...100) var age: 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<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
private let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue
self.range = range
}
}
// Example usage:
struct Person {
@Clamped(wrappedValue: 18, 18...100) var age: Int
}
let person = Person(age: 25)
print(person.age) // Output: 25
person.age = 15
print(person.age) // Output: 18 (clamped to the lower bound)
person.age = 105
print(person.age) // Output: 100 (clamped to the upper bound)
```
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue
self.range = range
}
}
struct Example {
@Clamped(wrappedValue: 10, 0...100) var value: Int
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue
self.range = range
}
}
// Example usage
struct Example {
@Clamped(wrappedValue: 10, 0...100) var value: Int
}
let example = Example()
example.value = 50
print(example.value) // Output: 50
example.value = -10
print(example.value) // Output: 0
example.value = 150
print(example.value) // Output: 100
```
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
private let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue
self.range = range
}
}
struct Person {
@Clamped(wrappedValue: 18, 18...100)
var age: Int
@Clamped(wrappedValue: 1.5, 1.5...2.5)
var height: Double
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
if wrappedValue < range.lowerBound {
wrappedValue = range.lowerBound
} else if wrappedValue > range.upperBound {
wrappedValue = range.upperBound
}
}
}
private let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue
self.range = range
}
}
// Example usage:
struct Person {
@Clamped(wrappedValue: 18, 18...100)
var age: Int
@Clamped(wrappedValue: 1.5, 1.5...2.5)
var height: Double
}
let person = Person(age: 25, height: 1.8)
print(person.age) // Output: 25
print(person.height) // Output: 1.8
person.age = 10
print(person.age) // Output: 18
person.height = 3.0
print(person.height) // Output: 2.5
```
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
wrappedValue = wrappedValue.clamped(to: range)
}
}
let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
extension Comparable {
func clamped(to range: ClosedRange<Self>) -> Self {
return min(max(self, range.lowerBound), range.upperBound)
}
}
struct Person {
@Clamped(wrappedValue: 18, 18...100)
var age: 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<Wrapped: Comparable>: ClampedProtocol {
var wrappedValue: Wrapped {
didSet {
wrappedValue = wrappedValue.clamped(to: range)
}
}
let range: ClosedRange<Wrapped>
init(wrappedValue: Wrapped, _ range: ClosedRange<Wrapped>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Extension to clamp a value within a specified range.
extension Comparable {
func clamped(to range: ClosedRange<Self>) -> Self {
return min(max(self, range.lowerBound), range.upperBound)
}
}
// Example usage:
struct Person {
@Clamped(wrappedValue: 18, 18...100)
var age: Int
}
let person = Person(age: 25)
print(person.age) // Output: 25
person.age = 10
print(person.age) // Output: 18
person.age = 120
print(person.age) // Output: 100
```
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct User {
@Logged var name: String
@Logged var age: Int
init(name: String, age: Int) {
self.name = name
self.age = age
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Example usage of the Logged property wrapper.
struct User {
@Logged var name: String
@Logged var age: Int
init(name: String, age: Int) {
self.name = name
self.age = age
}
}
// Example usage of the Logged property wrapper with a custom logger.
let user = User(name: "John", age: 30)
user.name = "Jane"
user.age = 31
// Output:
// Event: get, Value: John
// Event: set, Value: Jane
// Event: get, Value: 30
// Event: set, Value: 31
```
self.name = name // 'self' used before all stored properties are initializedself.age = age // 'self' used before all stored properties are initialized} // return from initializer without initializing all stored propertiesenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct Person {
@Logged var name: String
@Logged var age: Int
init(name: String, age: Int) {
self.name = name
self.age = age
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Example usage of the Logged property wrapper.
struct Person {
@Logged var name: String
@Logged var age: Int
init(name: String, age: Int) {
self.name = name
self.age = age
}
}
// Example usage of the Logged property wrapper with a custom logger.
let person = Person(name: "John", age: 30)
person.name = "Jane"
person.age = 31
// Output:
// Event: set, Value: "Jane"
// Event: set, Value: 31
```
self.name = name // 'self' used before all stored properties are initializedself.age = age // 'self' used before all stored properties are initialized} // return from initializer without initializing all stored propertiesenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct Person {
@Logged var name: String
@Logged var age: Int
init(name: String, age: Int) {
self.name = name
self.age = age
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Example usage of the Logged property wrapper.
struct Person {
@Logged var name: String
@Logged var age: Int
init(name: String, age: Int) {
self.name = name
self.age = age
}
}
// Example usage of the Logged property wrapper.
let person = Person(name: "John", age: 30)
person.name = "Jane"
person.age = 31
```
self.name = name // 'self' used before all stored properties are initializedself.age = age // 'self' used before all stored properties are initialized} // return from initializer without initializing all stored propertiesenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct Person: LoggedProtocol {
@Logged var name: String
init(name: String, logger: @escaping (Event, String) -> Void) {
self.name = name
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<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Example usage of the Logged property wrapper.
struct Person: LoggedProtocol {
@Logged var name: String
init(name: String, logger: @escaping (Event, String) -> Void) {
self.name = name
self.logger = logger
}
}
// Example usage of the Logged property wrapper.
let person = Person(name: "John", logger: { event, value in
print("Event: \(event), Value: \(value)")
})
// Accessing and modifying the wrapped property will trigger the logger.
print(person.name) // Output: Event: get, Value: John
person.name = "Jane" // Output: Event: set, Value: Jane
```
struct Person: LoggedProtocol { // type 'Person' does not conform to protocol 'LoggedProtocol'self.logger = logger // value of type 'Person' has no member 'logger'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct Person {
@Logged var name: String
@Logged var age: Int
init(name: String, age: Int) {
self.name = name
self.age = age
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Example usage of the Logged property wrapper.
struct Person {
@Logged var name: String
@Logged var age: Int
init(name: String, age: Int) {
self.name = name
self.age = age
}
}
// Example usage of the Logged property wrapper.
let person = Person(name: "John", age: 30)
person.name = "Jane"
person.age = 31
```
self.name = name // 'self' used before all stored properties are initializedself.age = age // 'self' used before all stored properties are initialized} // return from initializer without initializing all stored propertiesenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct Person {
@Logged var name: String
@Logged 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<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Example usage of the Logged property wrapper.
struct Person {
@Logged var name: String
@Logged var age: Int
}
let person = Person(name: "John", age: 30)
person.name = "Jane"
person.age = 35
```
// XCTAssertEqual failed: ([]) is not equal to (["Accessing value: 0"])enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped
let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Wrapped> {
return self
}
}
struct Person {
@Logged(wrappedValue: "John", logger: { event, value in
print("Event: \(event), Value: \(value)")
})
var name: String
@Logged(wrappedValue: 30, logger: { event, value in
print("Event: \(event), Value: \(value)")
})
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<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped
let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Wrapped> {
return self
}
}
// Example usage of the Logged property wrapper.
struct Person {
@Logged(wrappedValue: "John", logger: { event, value in
print("Event: \(event), Value: \(value)")
})
var name: String
@Logged(wrappedValue: 30, logger: { event, value in
print("Event: \(event), Value: \(value)")
})
var age: Int
}
// Create an instance of Person and access its properties.
let person = Person()
print(person.name) // Output: Event: get, Value: John
print(person.age) // Output: Event: get, Value: 30
person.name = "Jane" // Output: Event: set, Value: Jane
person.age = 25 // Output: Event: set, Value: 25
```
// XCTAssertEqual failed: ([]) is not equal to (["Accessing value: 0"])enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct Person {
@Logged(wrappedValue: "John", logger: { event, value in
print("Logging: \(event) - \(value)")
})
var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Example usage of the Logged property wrapper.
struct Person {
@Logged(wrappedValue: "John", logger: { event, value in
print("Logging: \(event) - \(value)")
})
var name: String
}
let person = Person()
person.name = "Jane" // Output: Logging: set - Jane
```
// XCTAssertEqual failed: ([]) is not equal to (["Accessing value: 0"])enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
class MyClass {
@Logged(wrappedValue: 0, logger: { event, value in
print("Event: \(event), Value: \(value)")
})
var myProperty: 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<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
private let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Example usage:
class MyClass {
@Logged(wrappedValue: 0, logger: { event, value in
print("Event: \(event), Value: \(value)")
})
var myProperty: Int
}
let myObject = MyClass()
myObject.myProperty = 10 // Output: Event: set, Value: 10
print(myObject.myProperty) // Output: Event: get, Value: 10
```
// XCTAssertEqual failed: ([]) is not equal to (["Accessing value: 0"])enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct Person {
@Logged(wrappedValue: "John", logger: { event, value in
print("Logged: \(event) - \(value)")
})
var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Wrapped>: LoggedProtocol {
var wrappedValue: Wrapped {
didSet {
logger(.set, wrappedValue)
}
}
let logger: (Event, Wrapped) -> Void
init(wrappedValue: Wrapped, logger: @escaping (Event, Wrapped) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Example usage of the Logged property wrapper.
struct Person {
@Logged(wrappedValue: "John", logger: { event, value in
print("Logged: \(event) - \(value)")
})
var name: String
}
let person = Person()
person.name = "Jane" // Output: Logged: set - Jane
```
// XCTAssertEqual failed: ([]) is not equal to (["Accessing value: 0"])protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var city: String = ""
private var results: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city.append(character)
results = provider.search(for: city)
return nil
case .keyboardDeleteBackwards:
city.removeLast()
results = provider.search(for: city)
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
class WeatherProviderImpl: WeatherProvider {
func search(for city: String) -> [String] {
// Perform search and return results.
return []
}
func forecast(for city: String) throws -> String {
// Perform forecast and return result.
throw NSError(domain: "", code: 0, userInfo: nil)
}
}
class WeatherApplicationViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
// Set up UI and handle user actions.
}
func handle(action: UserAction) {
if let feedback = application.handle(action: action) {
// Display feedback to user.
}
}
}```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 city: String = ""
private var results: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city.append(character)
results = provider.search(for: city)
return nil
case .keyboardDeleteBackwards:
city.removeLast()
results = provider.search(for: city)
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
// Weather provider.
// Provide search results and forecast for a given city.
class WeatherProviderImpl: WeatherProvider {
func search(for city: String) -> [String] {
// Perform search and return results.
return []
}
func forecast(for city: String) throws -> String {
// Perform forecast and return result.
throw NSError(domain: "", code: 0, userInfo: nil)
}
}
// Weather application.
// Use WeatherApplication to handle user actions and display results.
class WeatherApplicationViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
// Set up UI and handle user actions.
}
func handle(action: UserAction) {
if let feedback = application.handle(action: action) {
// Display feedback to user.
}
}
}
```
init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'results = provider.search(for: city) // value of type 'any WeatherProvider' has no member 'search'results = provider.search(for: city) // value of type 'any WeatherProvider' has no member 'search'class WeatherApplicationViewController: UIViewController { // cannot find type 'UIViewController' in scopesuper.init(nibName: nil, bundle: nil) // 'super' members cannot be referenced in a root classoverride func viewDidLoad() { // method does not override any method from its superclasssuper.viewDidLoad() // 'super' members cannot be referenced in a root classif let feedback = application.handle(action: action) { // value 'feedback' was defined but never used; consider replacing with boolean testprotocol 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 city: String = ""
private var results: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city.append(character)
results = provider.cities(for: city)
return nil
case .keyboardDeleteBackwards:
city.removeLast()
results = provider.cities(for: city)
return nil
case .searchButtonPress:
guard let forecast = try? provider.forecast(for: city) else {
return .failure(city: city)
}
return .success(city: city, forecast: forecast)
}
}
}
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
// Simulate network request.
// Return forecast for a given city.
return "Sunny"
}
func cities(for prefix: String) -> [String] {
// Simulate network request.
// Return cities that start with a given prefix.
return ["New York", "Los Angeles", "Chicago", "Houston", "Phoenix"]
}
}
class WeatherApplicationViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
// Set up UI.
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else {
return
}
switch feedback {
case .success(let city, let forecast):
// Display success message.
case .failure(let city):
// Display failure message.
}
}
}```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 city: String = ""
private var results: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city.append(character)
results = provider.cities(for: city)
return nil
case .keyboardDeleteBackwards:
city.removeLast()
results = provider.cities(for: city)
return nil
case .searchButtonPress:
guard let forecast = try? provider.forecast(for: city) else {
return .failure(city: city)
}
return .success(city: city, forecast: forecast)
}
}
}
// Weather provider.
// Provide cities and forecast for a given city.
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
// Simulate network request.
// Return forecast for a given city.
return "Sunny"
}
func cities(for prefix: String) -> [String] {
// Simulate network request.
// Return cities that start with a given prefix.
return ["New York", "Los Angeles", "Chicago", "Houston", "Phoenix"]
}
}
// Weather application.
// Use WeatherApplication to handle user actions and display results.
class WeatherApplicationViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
// Set up UI.
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else {
return
}
switch feedback {
case .success(let city, let forecast):
// Display success message.
case .failure(let city):
// Display failure message.
}
}
}
// Usage.
let provider = WeatherProviderImpl()
let application = WeatherApplication(provider: provider)
let viewController = WeatherApplicationViewController(application: application)
```
init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'results = provider.cities(for: city) // value of type 'any WeatherProvider' has no member 'cities'results = provider.cities(for: city) // value of type 'any WeatherProvider' has no member 'cities'class WeatherApplicationViewController: UIViewController { // cannot find type 'UIViewController' in scopesuper.init(nibName: nil, bundle: nil) // 'super' members cannot be referenced in a root classoverride func viewDidLoad() { // method does not override any method from its superclasssuper.viewDidLoad() // 'super' members cannot be referenced in a root classcase .success(let city, let forecast): // immutable value 'city' was never used; consider replacing with '_' or removing itcase .success(let city, let forecast): // immutable value 'forecast' was never used; consider replacing with '_' or removing itcase .success(let city, let forecast): // 'case' label in a 'switch' must have at least one executable statementcase .failure(let city): // 'case' label in a 'switch' must have at least one executable statementcase .failure(let city): // immutable value 'city' was never used; consider replacing with '_' or removing itprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchResults: [String] = []
private var currentCity: String?
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults = searchResults.filter { $0.hasPrefix(currentCity ?? "") }
searchResults.append(String(character))
currentCity = searchResults.joined()
return nil
case .keyboardDeleteBackwards:
searchResults.removeLast()
currentCity = searchResults.joined()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: currentCity ?? "")
return .success(city: currentCity ?? "", forecast: forecast)
} catch {
return .failure(city: currentCity ?? "")
}
}
}
}
class WeatherProviderMock: WeatherProvider {
func forecast(for city: String) throws -> String {
if city == "New York" {
return "Sunny"
} else if city == "London" {
return "Rainy"
} else {
throw NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey: "City not found"])
}
}
}```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 currentCity: String?
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults = searchResults.filter { $0.hasPrefix(currentCity ?? "") }
searchResults.append(String(character))
currentCity = searchResults.joined()
return nil
case .keyboardDeleteBackwards:
searchResults.removeLast()
currentCity = searchResults.joined()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: currentCity ?? "")
return .success(city: currentCity ?? "", forecast: forecast)
} catch {
return .failure(city: currentCity ?? "")
}
}
}
}
// Weather provider.
// Simulate network request to get weather forecast.
class WeatherProviderMock: WeatherProvider {
func forecast(for city: String) throws -> String {
if city == "New York" {
return "Sunny"
} else if city == "London" {
return "Rainy"
} else {
throw NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey: "City not found"])
}
}
}
// Usage example.
let provider = WeatherProviderMock()
let application = WeatherApplication(provider: provider)
// Simulate user actions.
application.handle(action: .keyboardCharacterSelect("N"))
application.handle(action: .keyboardCharacterSelect("e"))
application.handle(action: .keyboardCharacterSelect("w"))
application.handle(action: .keyboardCharacterSelect(" "))
application.handle(action: .keyboardCharacterSelect("Y"))
application.handle(action: .keyboardCharacterSelect("o"))
application.handle(action: .keyboardCharacterSelect("r"))
application.handle(action: .keyboardCharacterSelect("k"))
application.handle(action: .searchButtonPress)
// Output: .success(city: "New York", forecast: "Sunny")
```
init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
// Handle keyboard character selection.
return nil
case .keyboardDeleteBackwards:
// Handle keyboard delete backwards.
return nil
case .searchButtonPress:
// Handle search button press.
return nil
}
}
}
class WeatherApplicationViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
// Set up view controller.
}
func handle(action: UserAction) {
if let feedback = application.handle(action: action) {
// Handle application feedback.
}
}
}
class WeatherApplicationViewControllerFactory {
func createViewController() -> WeatherApplicationViewController {
let provider = WeatherProviderImpl()
let application = WeatherApplication(provider: provider)
return WeatherApplicationViewController(application: application)
}
}
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
// Fetch weather forecast from external API.
return ""
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
// Handle keyboard character selection.
return nil
case .keyboardDeleteBackwards:
// Handle keyboard delete backwards.
return nil
case .searchButtonPress:
// Handle search button press.
return nil
}
}
}
// Weather application view controller.
// Display search bar results and forecast.
class WeatherApplicationViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
// Set up view controller.
}
func handle(action: UserAction) {
if let feedback = application.handle(action: action) {
// Handle application feedback.
}
}
}
// Weather application view controller factory.
// Create WeatherApplicationViewController with WeatherApplication.
class WeatherApplicationViewControllerFactory {
func createViewController() -> WeatherApplicationViewController {
let provider = WeatherProviderImpl()
let application = WeatherApplication(provider: provider)
return WeatherApplicationViewController(application: application)
}
}
// Weather provider implementation.
// Fetch weather forecast from external API.
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
// Fetch weather forecast from external API.
return ""
}
}
```
init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'case .keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing itclass WeatherApplicationViewController: UIViewController { // cannot find type 'UIViewController' in scopesuper.init(nibName: nil, bundle: nil) // 'super' members cannot be referenced in a root classoverride func viewDidLoad() { // method does not override any method from its superclasssuper.viewDidLoad() // 'super' members cannot be referenced in a root classif let feedback = application.handle(action: action) { // value 'feedback' was defined but never used; consider replacing with boolean testprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
// Handle keyboard character selection
return nil
case .keyboardDeleteBackwards:
// Handle keyboard delete backwards
return nil
case .searchButtonPress:
// Handle search button press
return nil
}
}
}
class WeatherApplicationViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
// Set up view controller
}
func handle(action: UserAction) {
if let feedback = application.handle(action: action) {
// Display feedback
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
// Handle keyboard character selection
return nil
case .keyboardDeleteBackwards:
// Handle keyboard delete backwards
return nil
case .searchButtonPress:
// Handle search button press
return nil
}
}
}
// Weather application view controller.
// Display search bar results and forecast.
class WeatherApplicationViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
// Set up view controller
}
func handle(action: UserAction) {
if let feedback = application.handle(action: action) {
// Display feedback
}
}
}
```
init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'case .keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing itclass WeatherApplicationViewController: UIViewController { // cannot find type 'UIViewController' in scopesuper.init(nibName: nil, bundle: nil) // 'super' members cannot be referenced in a root classoverride func viewDidLoad() { // method does not override any method from its superclasssuper.viewDidLoad() // 'super' members cannot be referenced in a root classif let feedback = application.handle(action: action) { // value 'feedback' was defined but never used; consider replacing with boolean testprotocol 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 city: String = ""
private var searchResults: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city.append(character)
searchResults = ["London", "Paris", "Berlin"]
return nil
case .keyboardDeleteBackwards:
city.removeLast()
searchResults = ["London", "Paris", "Berlin"]
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
// Simulate network request.
// Return forecast for a city.
return "Sunny"
}
}
class WeatherApplicationViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
// Set up UI.
// Add keyboard observers.
// Add search button action.
}
@objc func handleKeyboardCharacterSelect(_ sender: UITextField) {
if let character = sender.text?.last {
let action = UserAction.keyboardCharacterSelect(character)
if let feedback = application.handle(action: action) {
displayFeedback(feedback)
}
}
}
@objc func handleKeyboardDeleteBackwards(_ sender: UITextField) {
let action = UserAction.keyboardDeleteBackwards
if let feedback = application.handle(action: action) {
displayFeedback(feedback)
}
}
@objc func handleSearchButtonPress(_ sender: UIButton) {
let action = UserAction.searchButtonPress
if let feedback = application.handle(action: action) {
displayFeedback(feedback)
}
}
private func displayFeedback(_ feedback: ApplicationFeedback) {
switch feedback {
case .success(let city, let forecast):
// Display success feedback.
print("Forecast for \(city): \(forecast)")
case .failure(let city):
// Display failure feedback.
print("Failed to get forecast for \(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 city: String = ""
private var searchResults: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city.append(character)
searchResults = ["London", "Paris", "Berlin"]
return nil
case .keyboardDeleteBackwards:
city.removeLast()
searchResults = ["London", "Paris", "Berlin"]
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
// Weather provider.
// Simulate network request to get forecast for a city.
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
// Simulate network request.
// Return forecast for a city.
return "Sunny"
}
}
// Weather application.
// Create WeatherApplication with WeatherProviderImpl.
// Handle user actions and display feedback.
class WeatherApplicationViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
// Set up UI.
// Add keyboard observers.
// Add search button action.
}
@objc func handleKeyboardCharacterSelect(_ sender: UITextField) {
if let character = sender.text?.last {
let action = UserAction.keyboardCharacterSelect(character)
if let feedback = application.handle(action: action) {
displayFeedback(feedback)
}
}
}
@objc func handleKeyboardDeleteBackwards(_ sender: UITextField) {
let action = UserAction.keyboardDeleteBackwards
if let feedback = application.handle(action: action) {
displayFeedback(feedback)
}
}
@objc func handleSearchButtonPress(_ sender: UIButton) {
let action = UserAction.searchButtonPress
if let feedback = application.handle(action: action) {
displayFeedback(feedback)
}
}
private func displayFeedback(_ feedback: ApplicationFeedback) {
switch feedback {
case .success(let city, let forecast):
// Display success feedback.
print("Forecast for \(city): \(forecast)")
case .failure(let city):
// Display failure feedback.
print("Failed to get forecast for \(city)")
}
}
}
```
init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'class WeatherApplicationViewController: UIViewController { // cannot find type 'UIViewController' in scopesuper.init(nibName: nil, bundle: nil) // 'super' members cannot be referenced in a root classoverride func viewDidLoad() { // method does not override any method from its superclasssuper.viewDidLoad() // 'super' members cannot be referenced in a root class@objc func handleKeyboardCharacterSelect(_ sender: UITextField) { // cannot find type 'UITextField' in scope@objc func handleKeyboardDeleteBackwards(_ sender: UITextField) { // cannot find type 'UITextField' in scope@objc func handleSearchButtonPress(_ sender: UIButton) { // cannot find type 'UIButton' in scopeprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var city: String = ""
private var results: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city.append(character)
results = provider.cities(for: city)
return nil
case .keyboardDeleteBackwards:
city.removeLast()
results = provider.cities(for: city)
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
class WeatherProviderImpl: WeatherProvider {
private let cities: [String] = ["New York", "London", "Paris", "Tokyo", "Sydney"]
func forecast(for city: String) throws -> String {
guard let index = cities.firstIndex(of: city) else {
throw WeatherProviderError.cityNotFound
}
return "Forecast for \(city): Sunny"
}
func cities(for prefix: String) -> [String] {
return cities.filter { $0.hasPrefix(prefix) }
}
}
enum WeatherProviderError: Error {
case cityNotFound
}```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 city: String = ""
private var results: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city.append(character)
results = provider.cities(for: city)
return nil
case .keyboardDeleteBackwards:
city.removeLast()
results = provider.cities(for: city)
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
// Weather provider.
// Provide list of cities and forecast for given city.
class WeatherProviderImpl: WeatherProvider {
private let cities: [String] = ["New York", "London", "Paris", "Tokyo", "Sydney"]
func forecast(for city: String) throws -> String {
guard let index = cities.firstIndex(of: city) else {
throw WeatherProviderError.cityNotFound
}
return "Forecast for \(city): Sunny"
}
func cities(for prefix: String) -> [String] {
return cities.filter { $0.hasPrefix(prefix) }
}
}
enum WeatherProviderError: Error {
case cityNotFound
}
// Usage example.
let provider = WeatherProviderImpl()
let application = WeatherApplication(provider: provider)
// Handle user actions.
let feedback = application.handle(action: .keyboardCharacterSelect("N"))
print(feedback) // nil
let feedback2 = application.handle(action: .keyboardCharacterSelect("e"))
print(feedback2) // nil
let feedback3 = application.handle(action: .searchButtonPress)
print(feedback3) // .success(city: "New York", forecast: "Forecast for New York: Sunny")
let feedback4 = application.handle(action: .keyboardCharacterSelect("L"))
print(feedback4) // nil
let feedback5 = application.handle(action: .searchButtonPress)
print(feedback5) // .failure(city: "London")
```
init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'results = provider.cities(for: city) // value of type 'any WeatherProvider' has no member 'cities'results = provider.cities(for: city) // value of type 'any WeatherProvider' has no member 'cities'guard let index = cities.firstIndex(of: city) else { // value 'index' was defined but never used; consider replacing with boolean testprotocol 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 city: String = ""
private var searchResults: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city.append(character)
searchResults = provider.cities(for: city)
return nil
case .keyboardDeleteBackwards:
city.removeLast()
searchResults = provider.cities(for: city)
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
class WeatherProviderImpl: WeatherProvider {
private let cities: [String] = ["New York", "London", "Paris", "Tokyo"]
private let forecasts: [String: String] = [
"New York": "Sunny",
"London": "Rainy",
"Paris": "Cloudy",
"Tokyo": "Partly cloudy"
]
func forecast(for city: String) throws -> String {
guard let forecast = forecasts[city] else {
throw WeatherProviderError.cityNotFound
}
return forecast
}
func cities(for prefix: String) -> [String] {
return cities.filter { $0.hasPrefix(prefix) }
}
}
enum WeatherProviderError: Error {
case cityNotFound
}```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 city: String = ""
private var searchResults: [String] = []
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city.append(character)
searchResults = provider.cities(for: city)
return nil
case .keyboardDeleteBackwards:
city.removeLast()
searchResults = provider.cities(for: city)
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
// Weather provider.
// Provide cities and forecast for a given city.
class WeatherProviderImpl: WeatherProvider {
private let cities: [String] = ["New York", "London", "Paris", "Tokyo"]
private let forecasts: [String: String] = [
"New York": "Sunny",
"London": "Rainy",
"Paris": "Cloudy",
"Tokyo": "Partly cloudy"
]
func forecast(for city: String) throws -> String {
guard let forecast = forecasts[city] else {
throw WeatherProviderError.cityNotFound
}
return forecast
}
func cities(for prefix: String) -> [String] {
return cities.filter { $0.hasPrefix(prefix) }
}
}
enum WeatherProviderError: Error {
case cityNotFound
}
// Usage example.
let provider = WeatherProviderImpl()
let application = WeatherApplication(provider: provider)
// Handle user actions.
let actions: [UserAction] = [
.keyboardCharacterSelect("N"),
.keyboardCharacterSelect("e"),
.keyboardCharacterSelect("w"),
.keyboardCharacterSelect(" "),
.keyboardCharacterSelect("Y"),
.keyboardCharacterSelect("o"),
.keyboardCharacterSelect("r"),
.keyboardCharacterSelect("k"),
.searchButtonPress
]
for action in actions {
if let feedback = application.handle(action: action) {
print(feedback)
}
}
```
init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'searchResults = provider.cities(for: city) // value of type 'any WeatherProvider' has no member 'cities'searchResults = provider.cities(for: city) // value of type 'any WeatherProvider' has no member 'cities'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 city: String = ""
private var results: [String] = []
private var feedback: ApplicationFeedback?
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city.append(character)
results = provider.cities(for: city)
return nil
case .keyboardDeleteBackwards:
city.removeLast()
results = provider.cities(for: city)
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: city)
feedback = .success(city: city, forecast: forecast)
} catch {
feedback = .failure(city: city)
}
return feedback
}
}
}
class WeatherProviderImpl: WeatherProvider {
private let cities: [String: [String]] = [
"New York": ["NY", "NYC", "New York City"],
"Los Angeles": ["LA", "LAX", "Los Angeles"],
"Chicago": ["CHI", "Chicago"],
"Houston": ["HOU", "Houston"],
"Phoenix": ["PHX", "Phoenix"],
"Philadelphia": ["PHL", "Philadelphia"],
"San Antonio": ["SA", "San Antonio"],
"San Diego": ["SD", "San Diego"],
"Dallas": ["DAL", "Dallas"],
"San Jose": ["SJ", "San Jose"]
]
func cities(for query: String) -> [String] {
return cities.keys.filter { $0.lowercased().hasPrefix(query.lowercased()) }
}
func forecast(for city: String) throws -> String {
guard let forecast = cities[city]?.first else {
throw NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey: "City not found"])
}
return "The forecast for \(city) is \(forecast)."
}
}```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 city: String = ""
private var results: [String] = []
private var feedback: ApplicationFeedback?
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
city.append(character)
results = provider.cities(for: city)
return nil
case .keyboardDeleteBackwards:
city.removeLast()
results = provider.cities(for: city)
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: city)
feedback = .success(city: city, forecast: forecast)
} catch {
feedback = .failure(city: city)
}
return feedback
}
}
}
// Weather provider.
// Provide cities and forecast for a given city.
class WeatherProviderImpl: WeatherProvider {
private let cities: [String: [String]] = [
"New York": ["NY", "NYC", "New York City"],
"Los Angeles": ["LA", "LAX", "Los Angeles"],
"Chicago": ["CHI", "Chicago"],
"Houston": ["HOU", "Houston"],
"Phoenix": ["PHX", "Phoenix"],
"Philadelphia": ["PHL", "Philadelphia"],
"San Antonio": ["SA", "San Antonio"],
"San Diego": ["SD", "San Diego"],
"Dallas": ["DAL", "Dallas"],
"San Jose": ["SJ", "San Jose"]
]
func cities(for query: String) -> [String] {
return cities.keys.filter { $0.lowercased().hasPrefix(query.lowercased()) }
}
func forecast(for city: String) throws -> String {
guard let forecast = cities[city]?.first else {
throw NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey: "City not found"])
}
return "The forecast for \(city) is \(forecast)."
}
}
// Usage example.
let provider = WeatherProviderImpl()
let application = WeatherApplication(provider: provider)
application.handle(action: .keyboardCharacterSelect("N"))
application.handle(action: .keyboardCharacterSelect("Y"))
application.handle(action: .keyboardCharacterSelect("W"))
application.handle(action: .searchButtonPress)
print(application.feedback) // Output: Optional(.success(city: "New York", forecast: "The forecast for New York is NY."))
```
init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'results = provider.cities(for: city) // value of type 'any WeatherProvider' has no member 'cities'results = provider.cities(for: city) // value of type 'any WeatherProvider' has no member 'cities'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 selectedCity: String?
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults = searchResults.filter { $0.hasPrefix(selectedCity ?? "") + String(character) }
case .keyboardDeleteBackwards:
selectedCity?.removeLast()
searchResults = searchResults.filter { $0.hasPrefix(selectedCity ?? "") }
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 {
private let provider: WeatherProvider
private var searchResults: [String] = []
private var selectedCity: String?
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchResults = searchResults.filter { $0.hasPrefix(selectedCity ?? "") + String(character) }
case .keyboardDeleteBackwards:
selectedCity?.removeLast()
searchResults = searchResults.filter { $0.hasPrefix(selectedCity ?? "") }
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 = searchResults.filter { $0.hasPrefix(selectedCity ?? "") + String(character) } // cannot convert value of type 'String' to closure result type 'Bool'searchResults = searchResults.filter { $0.hasPrefix(selectedCity ?? "") + String(character) } // cannot convert value of type 'Bool' to expected argument type 'String'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 await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.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 await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Example usage:
let account = BankAccount(balance: 1000.0)
Task {
await account.deposit(amount: 500.0)
print("Current balance: \(await account.balance)")
}
Task {
let success = await account.withdraw(amount: 200.0)
if success {
print("Withdrawal successful. Current balance: \(await account.balance)")
} else {
print("Insufficient funds.")
}
}
```
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'return await self.balance // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.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 await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Example usage:
let account = BankAccount(balance: 1000.0)
Task {
await account.deposit(amount: 500.0)
print("Current balance: \(await account.balance)")
}
Task {
let success = await account.withdraw(amount: 200.0)
if success {
print("Withdrawal successful. Current balance: \(await account.balance)")
} else {
print("Insufficient funds.")
}
}
```
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'return await self.balance // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.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 await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Example usage:
let account = BankAccount(balance: 1000.0)
Task {
await account.deposit(amount: 500.0)
print("New balance: \(await account.balance)")
}
Task {
let success = await account.withdraw(amount: 200.0)
if success {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds.")
}
}
```
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'return await self.balance // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.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 await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Example usage:
let account = BankAccount(balance: 1000.0)
Task {
await account.deposit(amount: 500.0)
print("New balance: \(await account.balance)")
}
Task {
let success = await account.withdraw(amount: 200.0)
print("Withdrawal successful: \(success)")
print("New balance: \(await account.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'return await self.balance // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.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 await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Example usage:
let account = BankAccount(balance: 1000.0)
Task {
await account.deposit(amount: 500.0)
print("New balance: \(await account.balance)")
}
Task {
let success = await account.withdraw(amount: 200.0)
if success {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds.")
}
}
```
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'return await self.balance // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.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 await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Example usage:
let account = BankAccount(balance: 1000.0)
Task {
await account.deposit(amount: 500.0)
print("New balance: \(await account.balance)")
}
Task {
if await account.withdraw(amount: 200.0) {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds.")
}
}
```
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'return await self.balance // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.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 await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Example usage:
let account = BankAccount(balance: 1000.0)
Task {
await account.deposit(amount: 500.0)
print("New balance: \(await account.balance)")
}
Task {
let success = await account.withdraw(amount: 200.0)
if success {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds.")
}
}
```
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'return await self.balance // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.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 await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Example usage of the BankAccount class
let account = BankAccount(balance: 1000.0)
Task {
await account.deposit(amount: 500.0)
print("Balance after deposit: \(await account.balance)")
}
Task {
if await account.withdraw(amount: 200.0) {
print("Balance after withdrawal: \(await account.balance)")
} else {
print("Insufficient funds for withdrawal")
}
}
```
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'return await self.balance // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.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 await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Example usage:
let account = BankAccount(balance: 1000.0)
Task {
await account.deposit(amount: 500.0)
print("Balance after deposit: \(await account.balance)")
}
Task {
let success = await account.withdraw(amount: 200.0)
if success {
print("Balance after withdrawal: \(await account.balance)")
} else {
print("Insufficient funds for withdrawal.")
}
}
```
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'return await self.balance // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double
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
}
}
}
// Example usage:
let account = BankAccount(balance: 1000.0)
Task {
await account.deposit(amount: 500.0)
print("New balance: \(await account.balance)")
}
Task {
let success = await account.withdraw(amount: 200.0)
if success {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds.")
}
}
```
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value {
get { cache }
set { cache = newValue }
}
private var cache: Value
private var condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.cache = wrappedValue()
self.condition = condition
}
mutating func update() {
if condition() {
cache = wrappedValue()
}
}
}
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value {
get { cache }
set { cache = newValue }
}
private var cache: Value
private var condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.cache = wrappedValue()
self.condition = condition
}
mutating func update() {
if condition() {
cache = wrappedValue()
}
}
}
// Example usage:
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
}
let example = Example()
print(example.randomValue) // Prints a random value between 1 and 100
example.randomValue.update() // Recomputes the random value
print(example.randomValue) // Prints a new random value between 1 and 100
```
cache = wrappedValue() // cannot call value of non-function type 'Value'@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int // add () to forward @autoclosure parameterprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value {
get {
if let cachedValue = cachedValue {
return cachedValue
} else {
let newValue = wrappedValue()
cachedValue = newValue
return newValue
}
}
set {
wrappedValue = newValue
cachedValue = nil
}
}
private var cachedValue: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue()
self.condition = condition
}
mutating func update() {
if condition() {
cachedValue = nil
}
}
}
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
mutating func updateRandomValue() {
randomValue.update()
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value {
get {
if let cachedValue = cachedValue {
return cachedValue
} else {
let newValue = wrappedValue()
cachedValue = newValue
return newValue
}
}
set {
wrappedValue = newValue
cachedValue = nil
}
}
private var cachedValue: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue()
self.condition = condition
}
mutating func update() {
if condition() {
cachedValue = nil
}
}
}
// Example usage:
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
mutating func updateRandomValue() {
randomValue.update()
}
}
var example = Example()
print(example.randomValue) // Prints a random value between 1 and 100
example.updateRandomValue()
print(example.randomValue) // Prints the same random value
```
let newValue = wrappedValue() // cannot call value of non-function type 'Value'cachedValue = newValue // cannot assign to property: 'self' is immutablewrappedValue = newValue // attempting to modify 'wrappedValue' within its own setter@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int // add () to forward @autoclosure parameterrandomValue.update() // value of type 'Int' has no member 'update'protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
// Example usage:
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
}
let example = Example()
print(example.randomValue) // Prints a random value between 1 and 100
print(example.randomValue) // Prints the same random value
```
value = wrappedValue() // cannot call value of non-function type 'Value'value = wrappedValue() // cannot assign to property: 'self' is immutable@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int // add () to forward @autoclosure parameterprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value {
get { cache }
set { cache = newValue }
}
private var cache: Value
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.cache = wrappedValue()
self.condition = condition
}
mutating func update() {
if condition() {
cache = wrappedValue()
}
}
}
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value {
get { cache }
set { cache = newValue }
}
private var cache: Value
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.cache = wrappedValue()
self.condition = condition
}
mutating func update() {
if condition() {
cache = wrappedValue()
}
}
}
// Example usage:
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
}
let example = Example()
print(example.randomValue) // Prints a random value between 1 and 100
example.randomValue.update() // Recomputes the random value
print(example.randomValue) // Prints a new random value between 1 and 100
```
cache = wrappedValue() // cannot call value of non-function type 'Value'@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int // add () to forward @autoclosure parameterprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value {
get { cache }
set { cache = newValue }
}
private var cache: Value
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.cache = wrappedValue()
self.condition = condition
}
mutating func update() {
if condition() {
cache = wrappedValue()
}
}
}
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value {
get { cache }
set { cache = newValue }
}
private var cache: Value
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.cache = wrappedValue()
self.condition = condition
}
mutating func update() {
if condition() {
cache = wrappedValue()
}
}
}
// Example usage:
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
}
let example = Example()
print(example.randomValue) // Prints a random value between 1 and 100
example.randomValue.update() // Recomputes the random value
print(example.randomValue) // Prints a new random value between 1 and 100
```
cache = wrappedValue() // cannot call value of non-function type 'Value'@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int // add () to forward @autoclosure parameterprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value
let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue()
self.condition = condition
}
var projectedValue: Value {
if condition() {
wrappedValue = wrappedValue()
}
return wrappedValue
}
}
struct Person {
@Cached(wrappedValue: { "John" }, condition: { true }) var name: String
@Cached(wrappedValue: { 30 }, condition: { true }) var age: Int
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value
let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue()
self.condition = condition
}
var projectedValue: Value {
if condition() {
wrappedValue = wrappedValue()
}
return wrappedValue
}
}
// Example usage:
struct Person {
@Cached(wrappedValue: { "John" }, condition: { true }) var name: String
@Cached(wrappedValue: { 30 }, condition: { true }) var age: Int
}
let person = Person()
print(person.name) // Output: John
print(person.age) // Output: 30
```
wrappedValue = wrappedValue() // cannot assign to property: 'self' is immutablewrappedValue = wrappedValue() // cannot call value of non-function type 'Value'@Cached(wrappedValue: { "John" }, condition: { true }) var name: String // add () to forward @autoclosure parameter@Cached(wrappedValue: { 30 }, condition: { true }) var age: Int // add () to forward @autoclosure parameterprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
// Example usage:
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
}
let example = Example()
print(example.randomValue) // Prints a random value between 1 and 100
print(example.randomValue) // Prints the same value as before
example.randomValue = 50
print(example.randomValue) // Prints 50
print(example.randomValue) // Prints 50
```
value = wrappedValue() // cannot call value of non-function type 'Value'value = wrappedValue() // cannot assign to property: 'self' is immutable@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int // add () to forward @autoclosure parameterprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
struct Example {
@Cached(wrappedValue: { Date().timeIntervalSince1970 }, condition: { true }) var currentTime: Double
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
// Example usage
struct Example {
@Cached(wrappedValue: { Date().timeIntervalSince1970 }, condition: { true }) var currentTime: Double
}
let example = Example()
print(example.currentTime) // Prints the current time in seconds since 1970
example.currentTime = 0 // Sets the cached value to 0
print(example.currentTime) // Prints 0
example.currentTime = 100 // Sets the cached value to 100
print(example.currentTime) // Prints 100
example.currentTime = 200 // Sets the cached value to 200
print(example.currentTime) // Prints 200
```
value = wrappedValue() // cannot call value of non-function type 'Value'value = wrappedValue() // cannot assign to property: 'self' is immutable@Cached(wrappedValue: { Date().timeIntervalSince1970 }, condition: { true }) var currentTime: Double // add () to forward @autoclosure parameterprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value {
get {
if let cachedValue = cachedValue {
return cachedValue
} else {
let newValue = value()
cachedValue = newValue
return newValue
}
}
set {
cachedValue = newValue
}
}
private var cachedValue: Value?
private let value: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue
if condition() {
cachedValue = value()
}
}
}
struct Person {
@Cached(wrappedValue: { "John Doe" }, condition: { true }) var name: String
@Cached(wrappedValue: { 30 }, condition: { true }) var age: Int
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value {
get {
if let cachedValue = cachedValue {
return cachedValue
} else {
let newValue = value()
cachedValue = newValue
return newValue
}
}
set {
cachedValue = newValue
}
}
private var cachedValue: Value?
private let value: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue
if condition() {
cachedValue = value()
}
}
}
// Example usage:
struct Person {
@Cached(wrappedValue: { "John Doe" }, condition: { true }) var name: String
@Cached(wrappedValue: { 30 }, condition: { true }) var age: Int
}
let person = Person()
print(person.name) // Output: John Doe
print(person.age) // Output: 30
```
cachedValue = newValue // cannot assign to property: 'self' is immutable@Cached(wrappedValue: { "John Doe" }, condition: { true }) var name: String // add () to forward @autoclosure parameter@Cached(wrappedValue: { 30 }, condition: { true }) var age: Int // add () to forward @autoclosure parameterprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value {
get {
if let cachedValue = cachedValue {
return cachedValue
} else {
let newValue = value()
cachedValue = newValue
return newValue
}
}
set {
cachedValue = newValue
}
}
var projectedValue: Bool {
get {
condition()
}
set {
condition = { newValue }
}
}
private var cachedValue: Value?
private var value: () -> Value
private var condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue
self.condition = condition
}
}
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
var wrappedValue: Value {
get {
if let cachedValue = cachedValue {
return cachedValue
} else {
let newValue = value()
cachedValue = newValue
return newValue
}
}
set {
cachedValue = newValue
}
}
var projectedValue: Bool {
get {
condition()
}
set {
condition = { newValue }
}
}
private var cachedValue: Value?
private var value: () -> Value
private var condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue
self.condition = condition
}
}
// Example usage:
struct Example {
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int
}
let example = Example()
print(example.randomValue) // Prints a random value between 1 and 100
print(example.randomValue) // Prints the same random value
example.randomValue = 50 // Sets the random value to 50
print(example.randomValue) // Prints 50
example.randomValue = 75 // Sets the random value to 75
print(example.randomValue) // Prints 75
example.randomValue = 100 // Sets the random value to 100
print(example.randomValue) // Prints 100
```
cachedValue = newValue // cannot assign to property: 'self' is immutable@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { true }) var randomValue: Int // add () to forward @autoclosure parameterinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let double: (Int) -> Int = { $0 * 2 }
let addOneAndDouble = addOne >>> double
print(addOneAndDouble(3)) // Output: 8
```
infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let square: (Int) -> Int = { $0 * $0 }
let addOneAndSquare = addOne >>> square
print(addOneAndSquare(2)) // Output: 9
```
infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let double: (Int) -> Int = { $0 * 2 }
let addOneAndDouble = addOne >>> double
print(addOneAndDouble(3)) // Output: 8
```
infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let square: (Int) -> Int = { $0 * $0 }
let addOneThenSquare = addOne >>> square
let result = addOneThenSquare(3) // result is 16
```
infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let multiplyByTwo: (Int) -> Int = { $0 * 2 }
let addOneAndMultiplyByTwo = addOne >>> multiplyByTwo
print(addOneAndMultiplyByTwo(3)) // Output: 8
```
infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let multiplyByTwo: (Int) -> Int = { $0 * 2 }
let addOneAndMultiplyByTwo = addOne >>> multiplyByTwo
let result = addOneAndMultiplyByTwo(3) // result is 8
```
infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in g(f(a)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in g(f(a)) }
}
// Example usage of the >>> operator
let addOne: (Int) -> Int = { $0 + 1 }
let double: (Int) -> Int = { $0 * 2 }
let addOneAndDouble = addOne >>> double
print(addOneAndDouble(3)) // Output: 8
```
infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let square: (Int) -> Int = { $0 * $0 }
let addOneAndSquare = addOne >>> square
print(addOneAndSquare(2)) // Output: 9
```
infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { a in
g(f(a))
}
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let double: (Int) -> Int = { $0 * 2 }
let addOneAndDouble = addOne >>> double
let result = addOneAndDouble(3) // result is 8
```
infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence { associativity: left }
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let multiplyByTwo: (Int) -> Int = { $0 * 2 }
let addOneAndMultiplyByTwo = addOne >>> multiplyByTwo
let result = addOneAndMultiplyByTwo(3) // result is 8
```
import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
digest.update(with: Data(buffer[0..<bytesRead]))
} else if bytesRead < 0 {
return nil
}
}
return digest.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
digest.update(with: Data(buffer[0..<bytesRead]))
} else if bytesRead < 0 {
return nil
}
}
return digest.finalize()
}
```
var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
digest = SHA256.hash(data: Data(buffer[0..<bytesRead]))
}
}
return digest
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
digest = SHA256.hash(data: Data(buffer[0..<bytesRead]))
}
}
return digest
}
```
var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
digest.update(data: Data(buffer[0..<bytesRead]))
}
}
return digest.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
digest.update(data: Data(buffer[0..<bytesRead]))
}
}
return digest.finalize()
}
```
var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(buffer[0..<bytesRead]))
} else {
break
}
}
return hash.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(buffer[0..<bytesRead]))
} else {
break
}
}
return hash.finalize()
}
```
import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
digest = SHA256.hash(data: Data(buffer[0..<bytesRead]))
}
}
return digest
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
digest = SHA256.hash(data: Data(buffer[0..<bytesRead]))
}
}
return digest
}
```
var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
digest = SHA256.hash(data: Data(buffer[0..<bytesRead]))
} else {
break
}
}
return digest
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
digest = SHA256.hash(data: Data(buffer[0..<bytesRead]))
} else {
break
}
}
return digest
}
```
var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
let data = Data(bytes: buffer, count: bytesRead)
digest = SHA256.hash(data: data)
}
}
return digest
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var digest = SHA256Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
let data = Data(bytes: buffer, count: bytesRead)
digest = SHA256.hash(data: data)
}
}
return digest
}
```
var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(buffer[0..<bytesRead]))
} else if bytesRead < 0 {
return nil
}
}
return hash.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(buffer[0..<bytesRead]))
} else if bytesRead < 0 {
return nil
}
}
return hash.finalize()
}
```
import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(buffer.prefix(bytesRead)))
}
}
return hash.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(buffer.prefix(bytesRead)))
}
}
return hash.finalize()
}
```
import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(buffer[0..<bytesRead]))
}
}
return hash.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
var bytesRead = 0
while inputStream.hasBytesAvailable {
bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(buffer[0..<bytesRead]))
}
}
return hash.finalize()
}
```
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
let cString = UnsafeMutablePointer<Int8>.allocate(capacity: 16)
cString.initialize(from: tuple16, count: 16)
defer {
cString.deallocate()
}
let swiftString = String(cString: cString, encoding: .utf8)!
self = swiftString
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
let cString = UnsafeMutablePointer<Int8>.allocate(capacity: 16)
cString.initialize(from: tuple16, count: 16)
defer {
cString.deallocate()
}
let swiftString = String(cString: cString, encoding: .utf8)!
self = swiftString
}
}
// Example usage:
let tuple16: Tuple16 = (0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x21, 0x00, 0x00, 0x00, 0x00)
let string = String(tuple16: tuple16)
print(string) // Output: "Hello World!"
```
cString.initialize(from: tuple16, count: 16) // cannot convert value of type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') to expected argument type 'UnsafePointer<Int8>'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
let cString = withUnsafePointer(to: tuple16) { $0.withMemoryRebound(to: CChar.self, capacity: 16) { $0 } }
self.init(cString: cString)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
let cString = withUnsafePointer(to: tuple16) { $0.withMemoryRebound(to: CChar.self, capacity: 16) { $0 } }
self.init(cString: cString)
}
}
// Example usage:
let tuple16: Tuple16 = (0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x57, 0x6F, 0x72, 0x6C, 0x64, 0x21, 0x00, 0x00, 0x00, 0x00)
let string = String(tuple16: tuple16)
print(string) // Output: "Hello World!"
```
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
let cString = withUnsafePointer(to: tuple16) { $0.withMemoryRebound(to: CChar.self, capacity: 16) { $0 } }
self.init(cString: cString)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
let cString = withUnsafePointer(to: tuple16) { $0.withMemoryRebound(to: CChar.self, capacity: 16) { $0 } }
self.init(cString: cString)
}
}
// Example usage:
let tuple16: Tuple16 = (0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x21, 0x00, 0x00, 0x00, 0x00)
let string = String(tuple16: tuple16)
print(string) // Output: "Hello World!"
```
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
let cString = UnsafeMutablePointer<Int8>.allocate(capacity: 16)
cString.initialize(from: tuple16, count: 16)
defer { cString.deallocate() }
self.init(cString: cString)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
let cString = UnsafeMutablePointer<Int8>.allocate(capacity: 16)
cString.initialize(from: tuple16, count: 16)
defer { cString.deallocate() }
self.init(cString: cString)
}
}
// Example usage:
let tuple16: Tuple16 = (0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x21, 0x00, 0x00, 0x00, 0x00)
let string = String(tuple16: tuple16)
print(string) // Output: "Hello World!"
```
cString.initialize(from: tuple16, count: 16) // cannot convert value of type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') to expected argument type 'UnsafePointer<Int8>'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
let cString = withUnsafePointer(to: tuple16) { $0.withMemoryRebound(to: CChar.self, capacity: 16) { $0 } }
self.init(cString: cString)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
let cString = withUnsafePointer(to: tuple16) { $0.withMemoryRebound(to: CChar.self, capacity: 16) { $0 } }
self.init(cString: cString)
}
}
// Example usage:
let tuple16: Tuple16 = (0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x21, 0x00, 0x00, 0x00, 0x00)
let string = String(tuple16: tuple16)
print(string) // Output: "Hello World!"
```
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
let cString = UnsafeMutablePointer<Int8>.allocate(capacity: 16)
defer {
cString.deallocate()
}
cString.initialize(from: tuple16, count: 16)
self.init(cString: cString)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
let cString = UnsafeMutablePointer<Int8>.allocate(capacity: 16)
defer {
cString.deallocate()
}
cString.initialize(from: tuple16, count: 16)
self.init(cString: cString)
}
}
// Example usage:
let tuple16: Tuple16 = (0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x21, 0x00, 0x00, 0x00, 0x00)
let string = String(tuple16: tuple16)
print(string) // Output: Hello World!
```
cString.initialize(from: tuple16, count: 16) // cannot convert value of type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') to expected argument type 'UnsafePointer<Int8>'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var string = ""
for i in 0..<16 {
if tuple16[i] == 0 {
break
}
string.append(Character(UnicodeScalar(tuple16[i])))
}
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) {
var string = ""
for i in 0..<16 {
if tuple16[i] == 0 {
break
}
string.append(Character(UnicodeScalar(tuple16[i])))
}
self = string
}
}
// Example usage:
let tuple16: Tuple16 = (0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x21, 0x00, 0x00, 0x00, 0x00)
let string = String(tuple16: tuple16)
print(string) // Output: "Hello World!"
```
if tuple16[i] == 0 { // cannot access element using subscript for tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)'); use '.' notation insteadstring.append(Character(UnicodeScalar(tuple16[i]))) // cannot access element using subscript for tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)'); use '.' notation insteadtypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
let cString = withUnsafePointer(to: tuple16) { $0.withMemoryRebound(to: CChar.self, capacity: 16) { $0 } }
self.init(cString: cString)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
let cString = withUnsafePointer(to: tuple16) { $0.withMemoryRebound(to: CChar.self, capacity: 16) { $0 } }
self.init(cString: cString)
}
}
// Example usage:
let tuple16: Tuple16 = (0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x57, 0x6F, 0x72, 0x6C, 0x64, 0x21, 0x00, 0x00, 0x00, 0x00)
let string = String(tuple16: tuple16)
print(string) // Output: "Hello World!"
```
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
let cString = withUnsafePointer(to: tuple16) { $0.withMemoryRebound(to: CChar.self, capacity: 16) { $0 } }
self.init(cString: cString)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
let cString = withUnsafePointer(to: tuple16) { $0.withMemoryRebound(to: CChar.self, capacity: 16) { $0 } }
self.init(cString: cString)
}
}
// Example usage:
let tuple16: Tuple16 = (0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x21, 0x00, 0x00, 0x00, 0x00)
let string = String(tuple16: tuple16)
print(string) // Output: "Hello World!"
```
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
let cString = withUnsafePointer(to: tuple16) { $0.withMemoryRebound(to: CChar.self, capacity: 16) { $0 } }
self.init(cString: cString)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
let cString = withUnsafePointer(to: tuple16) { $0.withMemoryRebound(to: CChar.self, capacity: 16) { $0 } }
self.init(cString: cString)
}
}
// Example usage:
let tuple16: Tuple16 = (0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x57, 0x6F, 0x72, 0x6C, 0x64, 0x21, 0x00, 0x00, 0x00, 0x00)
let string = String(tuple16: tuple16)
print(string) // Output: "Hello World!"
```
import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferLockBaseAddress(lhs, .readOnly) &&
CVPixelBufferLockBaseAddress(rhs, .readOnly) &&
memcmp(CVPixelBufferGetBaseAddress(lhs), CVPixelBufferGetBaseAddress(rhs), CVPixelBufferGetBytesPerRow(lhs) * CVPixelBufferGetHeight(lhs)) == 0 &&
CVPixelBufferUnlockBaseAddress(lhs, .readOnly) &&
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferLockBaseAddress(lhs, .readOnly) &&
CVPixelBufferLockBaseAddress(rhs, .readOnly) &&
memcmp(CVPixelBufferGetBaseAddress(lhs), CVPixelBufferGetBaseAddress(rhs), CVPixelBufferGetBytesPerRow(lhs) * CVPixelBufferGetHeight(lhs)) == 0 &&
CVPixelBufferUnlockBaseAddress(lhs, .readOnly) &&
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
}
```
CVPixelBufferLockBaseAddress(lhs, .readOnly) && // type 'CVReturn' (aka 'Int32') cannot be used as a boolean; test for '!= 0' insteadCVPixelBufferLockBaseAddress(rhs, .readOnly) && // type 'CVReturn' (aka 'Int32') cannot be used as a boolean; test for '!= 0' insteadCVPixelBufferUnlockBaseAddress(lhs, .readOnly) && // type 'CVReturn' (aka 'Int32') cannot be used as a boolean; test for '!= 0' insteadCVPixelBufferUnlockBaseAddress(rhs, .readOnly) // type 'CVReturn' (aka 'Int32') cannot be used as a boolean; test for '!= 0' insteadimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferLockBaseAddress(lhs, CVPixelBufferLockFlags(rawValue: 0)) &&
CVPixelBufferLockBaseAddress(rhs, CVPixelBufferLockFlags(rawValue: 0)) &&
memcmp(CVPixelBufferGetBaseAddress(lhs), CVPixelBufferGetBaseAddress(rhs), CVPixelBufferGetBytesPerRow(lhs) * CVPixelBufferGetHeight(lhs)) == 0 &&
CVPixelBufferUnlockBaseAddress(lhs, CVPixelBufferLockFlags(rawValue: 0)) &&
CVPixelBufferUnlockBaseAddress(rhs, CVPixelBufferLockFlags(rawValue: 0))
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferLockBaseAddress(lhs, CVPixelBufferLockFlags(rawValue: 0)) &&
CVPixelBufferLockBaseAddress(rhs, CVPixelBufferLockFlags(rawValue: 0)) &&
memcmp(CVPixelBufferGetBaseAddress(lhs), CVPixelBufferGetBaseAddress(rhs), CVPixelBufferGetBytesPerRow(lhs) * CVPixelBufferGetHeight(lhs)) == 0 &&
CVPixelBufferUnlockBaseAddress(lhs, CVPixelBufferLockFlags(rawValue: 0)) &&
CVPixelBufferUnlockBaseAddress(rhs, CVPixelBufferLockFlags(rawValue: 0))
}
// 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)
}
```
CVPixelBufferLockBaseAddress(lhs, CVPixelBufferLockFlags(rawValue: 0)) && // type 'CVReturn' (aka 'Int32') cannot be used as a boolean; test for '!= 0' insteadCVPixelBufferLockBaseAddress(rhs, CVPixelBufferLockFlags(rawValue: 0)) && // type 'CVReturn' (aka 'Int32') cannot be used as a boolean; test for '!= 0' insteadCVPixelBufferUnlockBaseAddress(lhs, CVPixelBufferLockFlags(rawValue: 0)) && // type 'CVReturn' (aka 'Int32') cannot be used as a boolean; test for '!= 0' insteadCVPixelBufferUnlockBaseAddress(rhs, CVPixelBufferLockFlags(rawValue: 0)) // type 'CVReturn' (aka 'Int32') cannot be used as a boolean; test for '!= 0' insteadimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs)
}
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers are not equal in size, pixel format, or content.
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}
```
// XCTAssertFalse failedimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs) &&
CVPixelBufferGetBytesPerRow(lhs) == CVPixelBufferGetBytesPerRow(rhs) &&
CVPixelBufferGetBytesPerRow(lhs) * CVPixelBufferGetHeight(lhs) == CVPixelBufferGetBytesPerRow(rhs) * CVPixelBufferGetHeight(rhs)
}
func !=(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return !(lhs == rhs)
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
return CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferGetBaseAddress(lhs) == CVPixelBufferGetBaseAddress(rhs) &&
CVPixelBufferGetBytesPerRow(lhs) == CVPixelBufferGetBytesPerRow(rhs) &&
CVPixelBufferGetBytesPerRow(lhs) * CVPixelBufferGetHeight(lhs) == CVPixelBufferGetBytesPerRow(rhs) * CVPixelBufferGetHeight(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)
}
```
// XCTAssertFalse failedimport CoreVideo```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 {
let lhsSize = CVPixelBufferGetWidth(lhs) * CVPixelBufferGetHeight(lhs)
let rhsSize = CVPixelBufferGetWidth(rhs) * CVPixelBufferGetHeight(rhs)
if lhsSize != rhsSize {
return false
}
let lhsFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsFormat = CVPixelBufferGetPixelFormatType(rhs)
if lhsFormat != rhsFormat {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
if lhsBaseAddress != rhsBaseAddress {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsBytesPerRow != rhsBytesPerRow {
// XCTAssertTrue failedimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsSize = CVPixelBufferGetWidth(lhs) * CVPixelBufferGetHeight(lhs)
let rhsSize = CVPixelBufferGetWidth(rhs) * CVPixelBufferGetHeight(rhs)
let lhsFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
return lhsSize == rhsSize && lhsFormat == rhsFormat && lhsBytesPerRow == rhsBytesPerRow && lhsBaseAddress == rhsBaseAddress
}```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 {
let lhsSize = CVPixelBufferGetWidth(lhs) * CVPixelBufferGetHeight(lhs)
let rhsSize = CVPixelBufferGetWidth(rhs) * CVPixelBufferGetHeight(rhs)
let lhsFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
return lhsSize == rhsSize && lhsFormat == rhsFormat && lhsBytesPerRow == rhsBytesPerRow && lhsBaseAddress == rhsBaseAddress
}
```
// XCTAssertFalse failedimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsSize = CVPixelBufferGetWidth(lhs) * CVPixelBufferGetHeight(lhs)
let rhsSize = CVPixelBufferGetWidth(rhs) * CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
return lhsSize == rhsSize && lhsPixelFormat == rhsPixelFormat && lhsBytesPerRow == rhsBytesPerRow && lhsData == rhsData
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsSize = CVPixelBufferGetWidth(lhs) * CVPixelBufferGetHeight(lhs)
let rhsSize = CVPixelBufferGetWidth(rhs) * CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
return lhsSize == rhsSize && lhsPixelFormat == rhsPixelFormat && lhsBytesPerRow == rhsBytesPerRow && lhsData == rhsData
}
```
// XCTAssertFalse failedimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsSize = CVPixelBufferGetWidth(lhs) * CVPixelBufferGetHeight(lhs)
let rhsSize = CVPixelBufferGetWidth(rhs) * CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
return lhsSize == rhsSize && lhsPixelFormat == rhsPixelFormat && lhsData == rhsData
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsSize = CVPixelBufferGetWidth(lhs) * CVPixelBufferGetHeight(lhs)
let rhsSize = CVPixelBufferGetWidth(rhs) * CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
return lhsSize == rhsSize && lhsPixelFormat == rhsPixelFormat && lhsData == rhsData
}
```
// XCTAssertFalse failedimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
return lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsPixelFormat == rhsPixelFormat && lhsBytesPerRow == rhsBytesPerRow && lhsData == rhsData
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
return lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsPixelFormat == rhsPixelFormat && lhsBytesPerRow == rhsBytesPerRow && lhsData == rhsData
}
```
// XCTAssertFalse failedimport CoreVideo```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 {
let lhsSize = CVPixelBufferGetWidth(lhs) * CVPixelBufferGetHeight(lhs)
let rhsSize = CVPixelBufferGetWidth(rhs) * CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRowAlignment = CVPixelBufferGetBytesPerRowAlignment(lhs)
let rhsBytesPerRowAlignment = CVPixelBufferGetBytesPerRowAlignment(rhs)
let lhsPlaneCount = CVPixelBufferGetPlaneCount(lhs)
let rhsPlaneCount = CVPixelBufferGetPlaneCount(rhs)
let lhsPlaneBaseAddress = CVPixelBufferGetPlaneBaseAddress(lhs, 0)
let rhsPlaneBaseAddress = CVPixelBufferGetPlaneBaseAddress(rhs, 0)
let lhsPlaneBytesPerRow = CVPixelBufferGetPlaneBytesPerRow(lhs, 0)
let rhsPlaneBytesPerRow = CVPixelBufferGetPlaneBytesPerRow(rhs, 0)
let lhsPlaneBytesPerRowAlignment = CVPixelBufferGetPlaneBytesPerRowAlignment(lhs, 0)
let rhsPlaneBytesPerRowAlignment = CVPixelBufferGetPlaneBytesPerRowAlignment(rhs, 0)
let lhsPlaneSize = CVPixelBufferGetPlaneSize(lhs, 0)
let rhsPlaneSize = CVPixelBufferGetPlaneSize(rhs, 0)
let lhsPlaneOffset = CVPixelBufferGetPlaneOffset(lhs, 0)
let rhsPlaneOffset = CVPixelBufferGetPlaneOffset(rhs, 0)
let lhsPlaneBytesPerRowOffset = CVPixelBufferGetPlaneBytesPerRowOffset(lhs, 0)
let rhsPlaneBytesPerRowOffset = CVPixelBufferGetPlaneBytesPerRowOffset(rhs, 0)
let lhsPlaneBytesPerRowAlignmentOffset = CVPixelBufferGetPlaneBytesPerRowAlignmentOffset(lhs, 0)
let rhsPlaneBytesPerRowAlignmentOffset = CVPixelBufferGetPlaneBytesPerRowAlignmentOffset(rhs, 0)
let lhsPlaneBytesPerRowOffsetAlignment = CVPixelBufferGetPlaneBytesPerRowOffsetAlignment(lhs, 0)
let rhsPlaneBytesPerRowOffsetAlignment = CVPixelBufferGetPlaneBytesPerRowOffsetAlignment(rhs, 0)
let lhsPlaneBytesPerRowOffsetAlignmentOffset = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffset(lhs, 0)
let rhsPlaneBytesPerRowOffsetAlignmentOffset = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffset(rhs, 0)
let lhsPlaneBytesPerRowOffsetAlignmentOffsetAlignment = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffsetAlignment(lhs, 0)
let rhsPlaneBytesPerRowOffsetAlignmentOffsetAlignment = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffsetAlignment(rhs, 0)
let lhsPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffset = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffset(lhs, 0)
let rhsPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffset = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffset(rhs, 0)
let lhsPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignment = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignment(lhs, 0)
let rhsPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignment = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignment(rhs, 0)
let lhsPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignmentOffset = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignmentOffset(lhs, 0)
let rhsPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignmentOffset = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignmentOffset(rhs, 0)
let lhsPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignmentOffsetAlignment = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignmentOffsetAlignment(lhs, 0)
let rhsPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignmentOffsetAlignment = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignmentOffsetAlignment(rhs, 0)
let lhsPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignmentOffsetAlignmentOffset = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignmentOffsetAlignmentOffset(lhs, 0)
let rhsPlaneBytesPerRowOffsetAlignmentOffsetAlignmentOffsetAlignmentOffsetAlignmentOffset = CVPixelBufferGetPlaneBytesPerRowOffsetAlignmentOffset // XCTAssertTrue failedstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let publicItems = items.map { item in
let publicItem = PublicItem(value: item.value)
return publicItem
}
return publicItems
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let publicItems = items.map { item in
let publicItem = PublicItem(value: item.value)
return publicItem
}
return publicItems
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Output: [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```
let publicItem = PublicItem(value: item.value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let size = MemoryLayout<PrivateItem>.size
let stride = MemoryLayout<PrivateItem>.stride
let alignment = MemoryLayout<PrivateItem>.alignment
// Allocate memory for the new array of public structs
let publicItems = UnsafeMutablePointer<PublicItem>.allocate(capacity: count)
// Copy the private structs into the new array of public structs
for i in 0..<count {
let privateItem = items[i]
let publicItem = publicItems[i]
publicItem.value = privateItem.value
}
// Return the new array of public structs
return Array(UnsafeBufferPointer(start: publicItems, count: count))
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let size = MemoryLayout<PrivateItem>.size
let stride = MemoryLayout<PrivateItem>.stride
let alignment = MemoryLayout<PrivateItem>.alignment
// Allocate memory for the new array of public structs
let publicItems = UnsafeMutablePointer<PublicItem>.allocate(capacity: count)
// Copy the private structs into the new array of public structs
for i in 0..<count {
let privateItem = items[i]
let publicItem = publicItems[i]
publicItem.value = privateItem.value
}
// Return the new array of public structs
return Array(UnsafeBufferPointer(start: publicItems, count: count))
}
```
publicItem.value = privateItem.value // cannot assign to property: 'value' is a 'let' constantpublicItem.value = privateItem.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] { // O(n) time complexity, O(n) space complexity
let count = items.count
let size = MemoryLayout.size(ofValue: items[0])
let alignment = MemoryLayout.alignment(ofValue: items[0])
let buffer = UnsafeMutableBufferPointer<UInt8>.allocate(capacity: count * size)
defer { buffer.deallocate() }
for i in 0..<count {
let source = UnsafeRawPointer(Unmanaged.passUnretained(&items[i]).toOpaque())
let destination = UnsafeMutableRawPointer(buffer.baseAddress! + i * size)
memcpy(destination, source, size)
}
return buffer.withMemoryRebound(to: PublicItem.self, capacity: count) { $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] { // O(n) time complexity, O(n) space complexity
let count = items.count
let size = MemoryLayout.size(ofValue: items[0])
let alignment = MemoryLayout.alignment(ofValue: items[0])
let buffer = UnsafeMutableBufferPointer<UInt8>.allocate(capacity: count * size)
defer { buffer.deallocate() }
for i in 0..<count {
let source = UnsafeRawPointer(Unmanaged.passUnretained(&items[i]).toOpaque())
let destination = UnsafeMutableRawPointer(buffer.baseAddress! + i * size)
memcpy(destination, source, size)
}
return buffer.withMemoryRebound(to: PublicItem.self, capacity: count) { $0 }
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```
let source = UnsafeRawPointer(Unmanaged.passUnretained(&items[i]).toOpaque()) // generic struct 'Unmanaged' requires that 'PrivateItem' be a class typelet source = UnsafeRawPointer(Unmanaged.passUnretained(&items[i]).toOpaque()) // generic struct 'Unmanaged' requires that 'PrivateItem' be a class typelet source = UnsafeRawPointer(Unmanaged.passUnretained(&items[i]).toOpaque()) // cannot pass immutable value as inout argument: 'items' is a 'let' constantlet source = UnsafeRawPointer(Unmanaged.passUnretained(&items[i]).toOpaque()) // '&' used with non-inout argument of type 'PrivateItem'let source = UnsafeRawPointer(Unmanaged.passUnretained(&items[i]).toOpaque()) // generic struct 'Unmanaged' requires that 'PrivateItem' be a class typereturn buffer.withMemoryRebound(to: PublicItem.self, capacity: count) { $0 } // extra trailing closure passed in callreturn buffer.withMemoryRebound(to: PublicItem.self, capacity: count) { $0 } // cannot convert value of type 'Int' to expected argument type '(UnsafeMutableBufferPointer<PublicItem>) throws -> [PublicItem]'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] { // O(n) time complexity, O(n) space complexity
let count = items.count
let size = MemoryLayout.size(ofValue: items[0])
let alignment = MemoryLayout.alignment(ofValue: items[0])
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: count * size, alignment: alignment)
defer { buffer.deallocate() }
items.withUnsafeBufferPointer { privateItems in
buffer.initializeMemory(from: privateItems.baseAddress!, byteCount: count * size)
}
return buffer.bindMemory(to: PublicItem.self, capacity: 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] { // O(n) time complexity, O(n) space complexity
let count = items.count
let size = MemoryLayout.size(ofValue: items[0])
let alignment = MemoryLayout.alignment(ofValue: items[0])
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: count * size, alignment: alignment)
defer { buffer.deallocate() }
items.withUnsafeBufferPointer { privateItems in
buffer.initializeMemory(from: privateItems.baseAddress!, byteCount: count * size)
}
return buffer.bindMemory(to: PublicItem.self, capacity: count)
}
// Example usage
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```
buffer.initializeMemory(from: privateItems.baseAddress!, byteCount: count * size) // cannot convert value of type 'UnsafePointer<PrivateItem>' to expected argument type 'Int.Type'buffer.initializeMemory(from: privateItems.baseAddress!, byteCount: count * size) // incorrect argument labels in call (have 'from:byteCount:', expected 'as:repeating:')return buffer.bindMemory(to: PublicItem.self, capacity: count) // cannot convert return expression of type 'UnsafeMutableBufferPointer<PublicItem>' to return type '[PublicItem]'return buffer.bindMemory(to: PublicItem.self, capacity: count) // extra argument 'capacity' in callstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] { // O(n) time complexity, O(n) space complexity
var publicItems = [PublicItem]()
for item in items {
let publicItem = PublicItem(value: item.value)
publicItems.append(publicItem)
}
return publicItems
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] { // O(n) time complexity, O(n) space complexity
var publicItems = [PublicItem]()
for item in items {
let publicItem = PublicItem(value: item.value)
publicItems.append(publicItem)
}
return publicItems
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Output: [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```
let publicItem = PublicItem(value: item.value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] { // O(n)
return items.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] { // O(n)
return items.map { PublicItem(value: $0.value) }
}
// 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] { // O(n)
return items.map { PublicItem(value: $0.value) }
}
```
return items.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] { // O(n)
return items.map { PublicItem(value: $0.value) }
}
func reveal2(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
func reveal3(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
func reveal4(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
func reveal5(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
func reveal6(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
func reveal7(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
func reveal8(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
func reveal9(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}```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] { // O(n)
return items.map { PublicItem(value: $0.value) }
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by using a temporary buffer to copy the values, assuming the structs have the same memory layout and alignment.
func reveal2(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by using a temporary buffer to copy the values, assuming the structs have the same memory layout and alignment.
func reveal3(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by using a temporary buffer to copy the values, assuming the structs have the same memory layout and alignment.
func reveal4(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by using a temporary buffer to copy the values, assuming the structs have the same memory layout and alignment.
func reveal5(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by using a temporary buffer to copy the values, assuming the structs have the same memory layout and alignment.
func reveal6(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by using a temporary buffer to copy the values, assuming the structs have the same memory layout and alignment.
func reveal7(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by using a temporary buffer to copy the values, assuming the structs have the same memory layout and alignment.
func reveal8(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by using a temporary buffer to copy the values, assuming the structs have the same memory layout and alignment.
func reveal9(items: [PrivateItem]) -> [PublicItem] { // O(n)
var result = [PublicItem]()
for item in items {
let buffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: 1)
buffer.initialize(to: PublicItem(value: item.value))
result.append(buffer.pointee)
buffer.deallocate()
}
return result
}
// Function to convert anreturn items.map { PublicItem(value: $0.value) } // 'value' is inaccessible due to 'private' protection levelbuffer.initialize(to: PublicItem(value: item.value)) // 'value' is inaccessible due to 'private' protection levelbuffer.initialize(to: PublicItem(value: item.value)) // 'value' is inaccessible due to 'private' protection levelbuffer.initialize(to: PublicItem(value: item.value)) // 'value' is inaccessible due to 'private' protection levelbuffer.initialize(to: PublicItem(value: item.value)) // 'value' is inaccessible due to 'private' protection levelbuffer.initialize(to: PublicItem(value: item.value)) // 'value' is inaccessible due to 'private' protection levelbuffer.initialize(to: PublicItem(value: item.value)) // 'value' is inaccessible due to 'private' protection levelbuffer.initialize(to: PublicItem(value: item.value)) // 'value' is inaccessible due to 'private' protection levelbuffer.initialize(to: PublicItem(value: item.value)) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let size = MemoryLayout.size(ofValue: items[0])
let pointer = UnsafeMutableRawPointer.allocate(byteCount: count * size, alignment: MemoryLayout.alignment(ofValue: items[0]))
pointer.copyMemory(from: items.withUnsafeBufferPointer { $0.baseAddress! }, byteCount: count * size)
let publicItems = UnsafeBufferPointer(start: pointer.assumingMemoryBound(to: PublicItem.self), count: count)
pointer.deallocate()
return Array(publicItems)
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let size = MemoryLayout.size(ofValue: items[0])
let pointer = UnsafeMutableRawPointer.allocate(byteCount: count * size, alignment: MemoryLayout.alignment(ofValue: items[0]))
pointer.copyMemory(from: items.withUnsafeBufferPointer { $0.baseAddress! }, byteCount: count * size)
let publicItems = UnsafeBufferPointer(start: pointer.assumingMemoryBound(to: PublicItem.self), count: count)
pointer.deallocate()
return Array(publicItems)
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Output: [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```
// XCTAssertEqual failed: ([0, 1, 2]) is not equal to ([2148007936, 8702366888, 0])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 size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let buffer = UnsafeMutableRawPointer.allocate(byteCount: count * size, alignment: alignment)
defer { buffer.deallocate() }
memcpy(buffer, items, count * size)
let publicItems = UnsafeBufferPointer(start: buffer.assumingMemoryBound(to: PublicItem.self), count: count)
return Array(publicItems)
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let size = MemoryLayout<PrivateItem>.size
let alignment = MemoryLayout<PrivateItem>.alignment
let buffer = UnsafeMutableRawPointer.allocate(byteCount: count * size, alignment: alignment)
defer { buffer.deallocate() }
memcpy(buffer, items, count * size)
let publicItems = UnsafeBufferPointer(start: buffer.assumingMemoryBound(to: PublicItem.self), count: count)
return Array(publicItems)
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Output: [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout.size(ofValue: items[0])
let count = items.count
let pointer = UnsafeMutableRawPointer.allocate(byteCount: size * count, alignment: MemoryLayout<PrivateItem>.alignment)
defer { pointer.deallocate() }
items.withUnsafeBufferPointer { buffer in
pointer.copyMemory(from: buffer.baseAddress!, byteCount: size * count)
}
return UnsafeBufferPointer(start: pointer.assumingMemoryBound(to: PublicItem.self), count: count).map { $0 }
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let size = MemoryLayout.size(ofValue: items[0])
let count = items.count
let pointer = UnsafeMutableRawPointer.allocate(byteCount: size * count, alignment: MemoryLayout<PrivateItem>.alignment)
defer { pointer.deallocate() }
items.withUnsafeBufferPointer { buffer in
pointer.copyMemory(from: buffer.baseAddress!, byteCount: size * count)
}
return UnsafeBufferPointer(start: pointer.assumingMemoryBound(to: PublicItem.self), count: count).map { $0 }
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Output: [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```
enum 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 }
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsValue = lhsComponents[i] ?? 0
let rhsValue = rhsComponents[i] ?? 0
if lhsValue < rhsValue {
return .orderedAscending
} else if lhsValue > rhsValue {
return .orderedDescending
}
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0) ?? 0 }
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsValue = lhsComponents[i] ?? 0
let rhsValue = rhsComponents[i] ?? 0
if lhsValue < rhsValue {
return .orderedAscending
} else if lhsValue > rhsValue {
return .orderedDescending
}
}
return .orderedSame
}
// Example usage:
let version1 = "1.2.3-alpha"
let version2 = "1.2.3-beta"
let version3 = "1.2.3"
print(compareVersions(version1, version2)) // Output: .orderedAscending
print(compareVersions(version2, version3)) // Output: .orderedDescending
print(compareVersions(version3, version1)) // Output: .orderedDescending
```
let lhsValue = lhsComponents[i] ?? 0 // left side of nil coalescing operator '??' has non-optional type 'Int', so the right side is never usedlet rhsValue = rhsComponents[i] ?? 0 // left side of nil coalescing operator '??' has non-optional type 'Int', so the right side is never used // Fatal error: Index out of rangeenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent == rhsComponent {
continue
}
let lhsInt = Int(lhsComponent) ?? 0
let rhsInt = Int(rhsComponent) ?? 0
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
} else {
let lhsAlpha = lhsComponent.contains("alpha") || lhsComponent.contains("beta")
let rhsAlpha = rhsComponent.contains("alpha") || rhsComponent.contains("beta")
if lhsAlpha && !rhsAlpha {
return .orderedAscending
} else if !lhsAlpha && rhsAlpha {
return .orderedDescending
} else {
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 {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent == rhsComponent {
continue
}
let lhsInt = Int(lhsComponent) ?? 0
let rhsInt = Int(rhsComponent) ?? 0
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
} else {
let lhsAlpha = lhsComponent.contains("alpha") || lhsComponent.contains("beta")
let rhsAlpha = rhsComponent.contains("alpha") || rhsComponent.contains("beta")
if lhsAlpha && !rhsAlpha {
return .orderedAscending
} else if !lhsAlpha && rhsAlpha {
return .orderedDescending
} else {
return .orderedSame
}
}
}
return .orderedSame
}
// Example usage:
let version1 = "1.0.0"
let version2 = "1.0.1"
let version3 = "1.0.0-alpha"
let version4 = "1.0.0-beta"
print(compareVersions(version1, version2)) // Output: orderedAscending
print(compareVersions(version1, version3)) // Output: orderedDescending
print(compareVersions(version3, version4)) // Output: orderedAscending
```
// 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 }
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsValue = lhsComponents[i] ?? 0
let rhsValue = rhsComponents[i] ?? 0
if lhsValue < rhsValue {
return .orderedAscending
} else if lhsValue > rhsValue {
return .orderedDescending
}
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0) ?? 0 }
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsValue = lhsComponents[i] ?? 0
let rhsValue = rhsComponents[i] ?? 0
if lhsValue < rhsValue {
return .orderedAscending
} else if lhsValue > rhsValue {
return .orderedDescending
}
}
return .orderedSame
}
// Example usage:
let version1 = "1.2.3-alpha"
let version2 = "1.2.3-beta"
let result = compareVersions(version1, version2)
print(result) // Output: .orderedAscending
```
let lhsValue = lhsComponents[i] ?? 0 // left side of nil coalescing operator '??' has non-optional type 'Int', so the right side is never usedlet rhsValue = rhsComponents[i] ?? 0 // left side of nil coalescing operator '??' has non-optional type 'Int', so the right side is never used // Fatal error: Index out of rangeenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
let lhsVersion = Int(lhsComponent) ?? 0
let rhsVersion = Int(rhsComponent) ?? 0
if lhsVersion < rhsVersion {
return .orderedAscending
} else if lhsVersion > rhsVersion {
return .orderedDescending
}
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
let lhsVersion = Int(lhsComponent) ?? 0
let rhsVersion = Int(rhsComponent) ?? 0
if lhsVersion < rhsVersion {
return .orderedAscending
} else if lhsVersion > rhsVersion {
return .orderedDescending
}
}
return .orderedSame
}
// Example usage:
let version1 = "1.2.3-alpha"
let version2 = "1.2.3-beta"
let result = compareVersions(version1, version2)
print(result) // Output: .orderedAscending
```
// XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split the version strings into their components
let lhsComponents = lhs.split(separator: ".")
let rhsComponents = rhs.split(separator: ".")
// Compare the major, minor, and patch components
for i in 0..<min(lhsComponents.count, rhsComponents.count) {
let lhsComponent = lhsComponents[i]
let rhsComponent = rhsComponents[i]
// If the components are numeric, compare them as integers
if let lhsInt = Int(lhsComponent), let rhsInt = Int(rhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
} else {
// If the components are not numeric, compare them as strings
if lhsComponent < rhsComponent {
return .orderedAscending
} else if lhsComponent > rhsComponent {
return .orderedDescending
}
}
}
// If the components are equal up to this point, compare the number of components
if lhsComponents.count < rhsComponents.count {
return .orderedAscending
} else if lhsComponents.count > rhsComponents.count {
return .orderedDescending
}
// If the components are equal, the versions are 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 strings into their components
let lhsComponents = lhs.split(separator: ".")
let rhsComponents = rhs.split(separator: ".")
// Compare the major, minor, and patch components
for i in 0..<min(lhsComponents.count, rhsComponents.count) {
let lhsComponent = lhsComponents[i]
let rhsComponent = rhsComponents[i]
// If the components are numeric, compare them as integers
if let lhsInt = Int(lhsComponent), let rhsInt = Int(rhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
} else {
// If the components are not numeric, compare them as strings
if lhsComponent < rhsComponent {
return .orderedAscending
} else if lhsComponent > rhsComponent {
return .orderedDescending
}
}
}
// If the components are equal up to this point, compare the number of components
if lhsComponents.count < rhsComponents.count {
return .orderedAscending
} else if lhsComponents.count > rhsComponents.count {
return .orderedDescending
}
// If the components are equal, the versions are the same
return .orderedSame
}
// Example usage
let version1 = "1.2.3-alpha"
let version2 = "1.2.3-beta"
let version3 = "1.2.3"
print(compareVersions(version1, version2)) // Output: orderedAscending
print(compareVersions(version2, version3)) // Output: orderedDescending
print(compareVersions(version1, version3)) // Output: orderedAscending
```
// XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let maxComponents = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxComponents {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if let lhsInt = Int(lhsComponent), let rhsInt = Int(rhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
} else {
let lhsAlpha = lhsComponent.contains("alpha") || lhsComponent.contains("beta")
let rhsAlpha = rhsComponent.contains("alpha") || rhsComponent.contains("beta")
if lhsAlpha && !rhsAlpha {
return .orderedAscending
} else if !lhsAlpha && rhsAlpha {
return .orderedDescending
} else if lhsAlpha && rhsAlpha {
let lhsAlphaIndex = lhsComponent.firstIndex(of: "a") ?? lhsComponent.firstIndex(of: "b") ?? lhsComponent.endIndex
let rhsAlphaIndex = rhsComponent.firstIndex(of: "a") ?? rhsComponent.firstIndex(of: "b") ?? rhsComponent.endIndex
let lhsAlphaValue = lhsComponent[lhsAlphaIndex...].dropFirst().compactMap { Int(String($0)) }.first ?? 0
let rhsAlphaValue = rhsComponent[rhsAlphaIndex...].dropFirst().compactMap { Int(String($0)) }.first ?? 0
if lhsAlphaValue < rhsAlphaValue {
return .orderedAscending
} else if lhsAlphaValue > rhsAlphaValue {
return .orderedDescending
}
}
}
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let maxComponents = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxComponents {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if let lhsInt = Int(lhsComponent), let rhsInt = Int(rhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
} else {
let lhsAlpha = lhsComponent.contains("alpha") || lhsComponent.contains("beta")
let rhsAlpha = rhsComponent.contains("alpha") || rhsComponent.contains("beta")
if lhsAlpha && !rhsAlpha {
return .orderedAscending
} else if !lhsAlpha && rhsAlpha {
return .orderedDescending
} else if lhsAlpha && rhsAlpha {
let lhsAlphaIndex = lhsComponent.firstIndex(of: "a") ?? lhsComponent.firstIndex(of: "b") ?? lhsComponent.endIndex
let rhsAlphaIndex = rhsComponent.firstIndex(of: "a") ?? rhsComponent.firstIndex(of: "b") ?? rhsComponent.endIndex
let lhsAlphaValue = lhsComponent[lhsAlphaIndex...].dropFirst().compactMap { Int(String($0)) }.first ?? 0
let rhsAlphaValue = rhsComponent[rhsAlphaIndex...].dropFirst().compactMap { Int(String($0)) }.first ?? 0
if lhsAlphaValue < rhsAlphaValue {
return .orderedAscending
} else if lhsAlphaValue > rhsAlphaValue {
return .orderedDescending
}
}
}
}
return .orderedSame
}
```
// XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
let lhsMajor = Int(lhsComponents[0]) ?? 0
let rhsMajor = Int(rhsComponents[0]) ?? 0
if lhsMajor != rhsMajor {
return lhsMajor > rhsMajor ? .orderedDescending : .orderedAscending
}
let lhsMinor = Int(lhsComponents[1]) ?? 0
let rhsMinor = Int(rhsComponents[1]) ?? 0
if lhsMinor != rhsMinor {
return lhsMinor > rhsMinor ? .orderedDescending : .orderedAscending
}
let lhsPatch = Int(lhsComponents[2]) ?? 0
let rhsPatch = Int(rhsComponents[2]) ?? 0
if lhsPatch != rhsPatch {
return lhsPatch > rhsPatch ? .orderedDescending : .orderedAscending
}
let lhsSuffix = lhsComponents[3]
let rhsSuffix = rhsComponents[3]
if lhsSuffix == rhsSuffix {
return .orderedSame
}
if lhsSuffix.hasPrefix("alpha") && rhsSuffix.hasPrefix("beta") {
return .orderedDescending
} else if lhsSuffix.hasPrefix("beta") && rhsSuffix.hasPrefix("alpha") {
return .orderedAscending
} else if lhsSuffix.hasPrefix("alpha") && rhsSuffix.hasPrefix("alpha") {
let lhsAlpha = Int(lhsSuffix.dropFirst(5)) ?? 0
let rhsAlpha = Int(rhsSuffix.dropFirst(5)) ?? 0
return lhsAlpha > rhsAlpha ? .orderedDescending : .orderedAscending
} else if lhsSuffix.hasPrefix("beta") && rhsSuffix.hasPrefix("beta") {
let lhsBeta = Int(lhsSuffix.dropFirst(4)) ?? 0
let rhsBeta = Int(rhsSuffix.dropFirst(4)) ?? 0
return lhsBeta > rhsBeta ? .orderedDescending : .orderedAscending
} else {
return .orderedSame
}
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
let lhsMajor = Int(lhsComponents[0]) ?? 0
let rhsMajor = Int(rhsComponents[0]) ?? 0
if lhsMajor != rhsMajor {
return lhsMajor > rhsMajor ? .orderedDescending : .orderedAscending
}
let lhsMinor = Int(lhsComponents[1]) ?? 0
let rhsMinor = Int(rhsComponents[1]) ?? 0
if lhsMinor != rhsMinor {
return lhsMinor > rhsMinor ? .orderedDescending : .orderedAscending
}
let lhsPatch = Int(lhsComponents[2]) ?? 0
let rhsPatch = Int(rhsComponents[2]) ?? 0
if lhsPatch != rhsPatch {
return lhsPatch > rhsPatch ? .orderedDescending : .orderedAscending
}
let lhsSuffix = lhsComponents[3]
let rhsSuffix = rhsComponents[3]
if lhsSuffix == rhsSuffix {
return .orderedSame
}
if lhsSuffix.hasPrefix("alpha") && rhsSuffix.hasPrefix("beta") {
return .orderedDescending
} else if lhsSuffix.hasPrefix("beta") && rhsSuffix.hasPrefix("alpha") {
return .orderedAscending
} else if lhsSuffix.hasPrefix("alpha") && rhsSuffix.hasPrefix("alpha") {
let lhsAlpha = Int(lhsSuffix.dropFirst(5)) ?? 0
let rhsAlpha = Int(rhsSuffix.dropFirst(5)) ?? 0
return lhsAlpha > rhsAlpha ? .orderedDescending : .orderedAscending
} else if lhsSuffix.hasPrefix("beta") && rhsSuffix.hasPrefix("beta") {
let lhsBeta = Int(lhsSuffix.dropFirst(4)) ?? 0
let rhsBeta = Int(rhsSuffix.dropFirst(4)) ?? 0
return lhsBeta > rhsBeta ? .orderedDescending : .orderedAscending
} else {
return .orderedSame
}
}
// Example usage:
let version1 = "1.2.3-alpha1"
let version2 = "1.2.3-beta2"
let version3 = "1.2.3"
print(compareVersions(version1, version2)) // Output: .orderedAscending
print(compareVersions(version2, version3)) // Output: .orderedAscending
print(compareVersions(version3, version1)) // Output: .orderedDescending
```
// Fatal error: Index out of rangeenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let lhsVersion = lhsComponents.map { Int($0) ?? 0 }
let rhsVersion = rhsComponents.map { Int($0) ?? 0 }
let lhsAlphaIndex = lhsComponents.firstIndex { $0.contains("alpha") }
let rhsAlphaIndex = rhsComponents.firstIndex { $0.contains("alpha") }
let lhsBetaIndex = lhsComponents.firstIndex { $0.contains("beta") }
let rhsBetaIndex = rhsComponents.firstIndex { $0.contains("beta") }
let lhsAlphaVersion = lhsAlphaIndex != nil ? Int(lhsComponents[lhsAlphaIndex!].replacingOccurrences(of: "alpha", with: "")) ?? 0 : 0
let rhsAlphaVersion = rhsAlphaIndex != nil ? Int(rhsComponents[rhsAlphaIndex!].replacingOccurrences(of: "alpha", with: "")) ?? 0 : 0
let lhsBetaVersion = lhsBetaIndex != nil ? Int(lhsComponents[lhsBetaIndex!].replacingOccurrences(of: "beta", with: "")) ?? 0 : 0
let rhsBetaVersion = rhsBetaIndex != nil ? Int(rhsComponents[rhsBetaIndex!].replacingOccurrences(of: "beta", with: "")) ?? 0 : 0
for i in 0..<max(lhsVersion.count, rhsVersion.count) {
let lhsValue = lhsVersion.count > i ? lhsVersion[i] : 0
let rhsValue = rhsVersion.count > i ? rhsVersion[i] : 0
if lhsValue < rhsValue {
return .orderedAscending
} else if lhsValue > rhsValue {
return .orderedDescending
}
}
if lhsAlphaVersion < rhsAlphaVersion {
return .orderedAscending
} else if lhsAlphaVersion > rhsAlphaVersion {
return .orderedDescending
}
if lhsBetaVersion < rhsBetaVersion {
return .orderedAscending
} else if lhsBetaVersion > rhsBetaVersion {
return .orderedDescending
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let lhsVersion = lhsComponents.map { Int($0) ?? 0 }
let rhsVersion = rhsComponents.map { Int($0) ?? 0 }
let lhsAlphaIndex = lhsComponents.firstIndex { $0.contains("alpha") }
let rhsAlphaIndex = rhsComponents.firstIndex { $0.contains("alpha") }
let lhsBetaIndex = lhsComponents.firstIndex { $0.contains("beta") }
let rhsBetaIndex = rhsComponents.firstIndex { $0.contains("beta") }
let lhsAlphaVersion = lhsAlphaIndex != nil ? Int(lhsComponents[lhsAlphaIndex!].replacingOccurrences(of: "alpha", with: "")) ?? 0 : 0
let rhsAlphaVersion = rhsAlphaIndex != nil ? Int(rhsComponents[rhsAlphaIndex!].replacingOccurrences(of: "alpha", with: "")) ?? 0 : 0
let lhsBetaVersion = lhsBetaIndex != nil ? Int(lhsComponents[lhsBetaIndex!].replacingOccurrences(of: "beta", with: "")) ?? 0 : 0
let rhsBetaVersion = rhsBetaIndex != nil ? Int(rhsComponents[rhsBetaIndex!].replacingOccurrences(of: "beta", with: "")) ?? 0 : 0
for i in 0..<max(lhsVersion.count, rhsVersion.count) {
let lhsValue = lhsVersion.count > i ? lhsVersion[i] : 0
let rhsValue = rhsVersion.count > i ? rhsVersion[i] : 0
if lhsValue < rhsValue {
return .orderedAscending
} else if lhsValue > rhsValue {
return .orderedDescending
}
}
if lhsAlphaVersion < rhsAlphaVersion {
return .orderedAscending
} else if lhsAlphaVersion > rhsAlphaVersion {
return .orderedDescending
}
if lhsBetaVersion < rhsBetaVersion {
return .orderedAscending
} else if lhsBetaVersion > rhsBetaVersion {
return .orderedDescending
}
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) ?? 0 }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let lhsAlphaIndex = lhsComponents.firstIndex { $0 < 0 }
let rhsAlphaIndex = rhsComponents.firstIndex { $0 < 0 }
if let lhsAlphaIndex = lhsAlphaIndex, let rhsAlphaIndex = rhsAlphaIndex {
if lhsAlphaIndex < rhsAlphaIndex {
return .orderedAscending
} else if lhsAlphaIndex > rhsAlphaIndex {
return .orderedDescending
} else {
let lhsAlpha = lhsComponents[lhsAlphaIndex]
let rhsAlpha = rhsComponents[rhsAlphaIndex]
if lhsAlpha < rhsAlpha {
return .orderedAscending
} else if lhsAlpha > rhsAlpha {
return .orderedDescending
} else {
return .orderedSame
}
}
} else if let lhsAlphaIndex = lhsAlphaIndex {
return .orderedAscending
} else if let rhsAlphaIndex = rhsAlphaIndex {
return .orderedDescending
} else {
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsValue = lhsComponents.count > i ? lhsComponents[i] : 0
let rhsValue = rhsComponents.count > i ? rhsComponents[i] : 0
if lhsValue < rhsValue {
return .orderedAscending
} else if lhsValue > rhsValue {
return .orderedDescending
}
}
return .orderedSame
}
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let rhsComponents = rhs.components(separatedBy: ".").map { Int($0) ?? 0 }
let lhsAlphaIndex = lhsComponents.firstIndex { $0 < 0 }
let rhsAlphaIndex = rhsComponents.firstIndex { $0 < 0 }
if let lhsAlphaIndex = lhsAlphaIndex, let rhsAlphaIndex = rhsAlphaIndex {
if lhsAlphaIndex < rhsAlphaIndex {
return .orderedAscending
} else if lhsAlphaIndex > rhsAlphaIndex {
return .orderedDescending
} else {
let lhsAlpha = lhsComponents[lhsAlphaIndex]
let rhsAlpha = rhsComponents[rhsAlphaIndex]
if lhsAlpha < rhsAlpha {
return .orderedAscending
} else if lhsAlpha > rhsAlpha {
return .orderedDescending
} else {
return .orderedSame
}
}
} else if let lhsAlphaIndex = lhsAlphaIndex {
return .orderedAscending
} else if let rhsAlphaIndex = rhsAlphaIndex {
return .orderedDescending
} else {
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsValue = lhsComponents.count > i ? lhsComponents[i] : 0
let rhsValue = rhsComponents.count > i ? rhsComponents[i] : 0
if lhsValue < rhsValue {
return .orderedAscending
} else if lhsValue > rhsValue {
return .orderedDescending
}
}
return .orderedSame
}
}
// Example usage:
let version1 = "1.2.3-alpha"
let version2 = "1.2.3-beta"
let version3 = "1.2.3"
let version4 = "1.2.4"
print(compareVersions(version1, version2)) // Output: orderedAscending
print(compareVersions(version2, version3)) // Output: orderedAscending
print(compareVersions(version3, version4)) // Output: orderedAscending
print(compareVersions(version4, version1)) // Output: orderedDescending
```
} else if let lhsAlphaIndex = lhsAlphaIndex { // value 'lhsAlphaIndex' was defined but never used; consider replacing with boolean test} else if let rhsAlphaIndex = rhsAlphaIndex { // value 'rhsAlphaIndex' was defined but never used; consider replacing with boolean test // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split the version strings into their components (major, minor, patch, pre-release, build metadata)
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
// Compare the major, minor, and patch components
for i in 0..<3 {
if let lhsInt = Int(lhsComponents[i]), let rhsInt = Int(rhsComponents[i]) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
} else if lhsComponents[i] < rhsComponents[i] {
return .orderedAscending
} else if lhsComponents[i] > rhsComponents[i] {
return .orderedDescending
}
}
// Compare the pre-release components
let lhsPreRelease = lhsComponents[3...].joined(separator: ".")
let rhsPreRelease = rhsComponents[3...].joined(separator: ".")
if lhsPreRelease < rhsPreRelease {
return .orderedAscending
} else if lhsPreRelease > rhsPreRelease {
return .orderedDescending
}
// Compare the build metadata components
let lhsBuildMetadata = lhsComponents[4...].joined(separator: ".")
let rhsBuildMetadata = rhsComponents[4...].joined(separator: ".")
if lhsBuildMetadata < rhsBuildMetadata {
return .orderedAscending
} else if lhsBuildMetadata > rhsBuildMetadata {
return .orderedDescending
}
// If all components are equal, the versions are 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 strings into their components (major, minor, patch, pre-release, build metadata)
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
// Compare the major, minor, and patch components
for i in 0..<3 {
if let lhsInt = Int(lhsComponents[i]), let rhsInt = Int(rhsComponents[i]) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
} else if lhsComponents[i] < rhsComponents[i] {
return .orderedAscending
} else if lhsComponents[i] > rhsComponents[i] {
return .orderedDescending
}
}
// Compare the pre-release components
let lhsPreRelease = lhsComponents[3...].joined(separator: ".")
let rhsPreRelease = rhsComponents[3...].joined(separator: ".")
if lhsPreRelease < rhsPreRelease {
return .orderedAscending
} else if lhsPreRelease > rhsPreRelease {
return .orderedDescending
}
// Compare the build metadata components
let lhsBuildMetadata = lhsComponents[4...].joined(separator: ".")
let rhsBuildMetadata = rhsComponents[4...].joined(separator: ".")
if lhsBuildMetadata < rhsBuildMetadata {
return .orderedAscending
} else if lhsBuildMetadata > rhsBuildMetadata {
return .orderedDescending
}
// If all components are equal, the versions are the same
return .orderedSame
}
```
// Fatal error: Index out of range