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| public typealias CompletionHandler = Function<Void, Void> | |
| public typealias SideEffect<Input> = Function<Input, Void> | |
| public struct Function<Input, Output>: Identifiable { | |
| public let id: String | |
| internal let f: (Input) -> Output | |
| public init( | |
| id: String, | |
| f: @escaping (Input) -> Output | |
| ) { | |
| self.id = id | |
| self.f = f | |
| } | |
| public init(f: @escaping (Input) -> Output) { | |
| self.init(id: generateIdentifier(), f: f) | |
| } | |
| public func apply(input: Input) -> Output { | |
| f(input) | |
| } | |
| public func contraMap<T>(_ g: @escaping (T) -> Input) -> Function<T, Output> { | |
| Function<T, Output>(f: g >>> self.apply(input:)) | |
| } | |
| public func map<T>(_ g: @escaping (Output) -> T) -> Function<Input, T> { | |
| Function<Input, T>(f: self.apply(input:) >>> g) | |
| } | |
| public func callAsFunction(_ input: Input) -> Output { | |
| f(input) | |
| } | |
| } | |
| public extension Function where Input == Void, Output == Void { | |
| func apply() { | |
| f(()) | |
| } | |
| } | |
| public extension Function where Input == Void { | |
| func apply() -> Output { | |
| f(()) | |
| } | |
| } | |
| public extension Function where Output == Void { | |
| static var empty: Function { | |
| return Function { _ in } | |
| } | |
| } | |
| extension Function: Equatable { | |
| public static func == (lhs: Function<Input, Output>, rhs: Function<Input, Output>) -> Bool { | |
| lhs.id == rhs.id | |
| } | |
| } | |
| public extension Function where Input == Output { | |
| static var identity: Function { | |
| return Function { $0 } | |
| } | |
| } | |
| public func >>> <A, B, C>(a: Function<A, B>, b: Function<B, C>) -> Function<A, C> { | |
| return Function(f: a.f >>> b.f) | |
| } |
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