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// RUN: %target-typecheck-verify-swift
protocol Observer {
associatedtype Value
func onNext(_ item: Value) -> Void
func onCompleted() -> Void
func onError(_ error: String) -> Void
}
protocol Observable {
associatedtype Value
func subscribe<O: Observer>(_ observer: O) -> Any where O.Value == Value
}
class Subject<T>: Observer, Observable {
typealias Value = T
// Observer implementation
var onNextFunc: ((T) -> Void)?
var onCompletedFunc: (() -> Void)?
var onErrorFunc: ((String) -> Void)?
func onNext(_ item: T) -> Void {
onNextFunc?(item)
}
func onCompleted() -> Void {
onCompletedFunc?()
}
func onError(_ error: String) -> Void {
onErrorFunc?(error)
}
// Observable implementation
func subscribe<O: Observer>(_ observer: O) -> Any where O.Value == T {
self.onNextFunc = { (item: T) -> Void in
observer.onNext(item)
}
self.onCompletedFunc = {
observer.onCompleted()
}
self.onErrorFunc = { (error: String) -> Void in
observer.onError(error)
}
return self
}
}
protocol P {
associatedtype A
func onNext(_ item: A) -> Void
}
struct IP<T> : P {
typealias A = T
init<O:P>(x:O) where O.A == IP.A {
_onNext = { (item: A) in x.onNext(item) }
}
func onNext(_ item: A) { _onNext(item) }
var _onNext: (A) -> ()
}
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