Shorthand to put stuff on bg thread in Swift

bgThread.swift

//https://thatthinginswift.com/background-threads/

import Foundation

//{ /* do some task on bg thread */ } ~> { /* update some UI on the main thread */}

infix operator ~> {}

private let queue = dispatch_queue_create("serial-worker", DISPATCH_QUEUE_SERIAL)

func ~> <R> (
    backgroundClosure: () -> R,
    mainClosure: (result: R) -> ())
{
    dispatch_async(queue){
        let result = backgroundClosure()
        dispatch_async(dispatch_get_main_queue(), {
            mainClosure(result: result)
        })
    }
}