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| import Foundation | |
| import PlaygroundSupport | |
| PlaygroundPage.current.needsIndefiniteExecution = true | |
| func async<T>(_ executable: @escaping @autoclosure () -> T, _ priority: DispatchQoS.QoSClass = DispatchQoS.QoSClass.default, completion: @escaping (T) -> Void) { | |
| DispatchQueue.global(qos: priority).async { | |
| let result = executable() | |
| DispatchQueue.main.async { | |
| completion(result) | |
| } | |
| } | |
| } | |
| func asyncWithError<T>(_ executable: @escaping @autoclosure () throws -> T, _ priority: DispatchQoS.QoSClass = DispatchQoS.QoSClass.default, completion: @escaping (T?, Error?) -> Void) { | |
| DispatchQueue.global(qos: priority).async { | |
| var result: T? = nil | |
| var error: Error? = nil | |
| do { | |
| result = try executable() | |
| } | |
| catch let caughtError { | |
| error = caughtError | |
| } | |
| DispatchQueue.main.async { | |
| completion(result, error) | |
| } | |
| } | |
| } | |
| class TestExecutor { | |
| func perform(_ input: String) -> String { | |
| return input + " Performed" | |
| } | |
| enum Error: String, Swift.Error, LocalizedError { | |
| case Empty | |
| var errorDescription: String? { | |
| return self.rawValue | |
| } | |
| } | |
| func throwingPerform(_ input: String) throws -> String { | |
| if input.isEmpty { | |
| throw Error.Empty | |
| } | |
| return self.perform(input) | |
| } | |
| } | |
| let executor = TestExecutor() | |
| let syncResult = executor.perform("Hi") | |
| async(executor.perform("Async")) { result in | |
| print(result) | |
| } | |
| asyncWithError(try executor.throwingPerform("")) { result, error in | |
| print("result: ", result ?? "no result", ", error: ", error?.localizedDescription ?? "no error") | |
| PlaygroundPage.current.finishExecution() | |
| } |
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