dispatch

public struct Dispatch {

	public static func main(block: @escaping ()->()) {
		return DispatchQueue.main.async(execute: block)
	}

	public static func background(block: @escaping ()->()) {
		return DispatchQueue.global(qos: DispatchQoS.QoSClass.background).async(execute: block)
	}

	public static func main(after seconds: Double, block: @escaping ()->()) {
		return DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + Double(Int64(seconds * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC), execute: block)
	}

	public static func background(after seconds: Double, block: @escaping ()->()) {
		return DispatchQueue.global(qos: DispatchQoS.QoSClass.background).asyncAfter(deadline: DispatchTime.now() + Double(Int64(seconds * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC), execute: block)
	}

	// use in main-thread, call this or ...ASync in async{}
	public static func await<T>(_ block: @escaping () -> T?) -> T? {
		var result: T?
		var done = false

		background {
			result = block()
			done = true
		}

		while done == false { CFRunLoopRunInMode(CFRunLoopMode.defaultMode, 0.02, false) }
		return result
	}

	public static func async(_ block: @escaping () -> Void) {
		CFRunLoopPerformBlock(CFRunLoopGetCurrent(), CFRunLoopMode.commonModes as CFTypeRef!, block)
	}

}