What does Void() in Swift 4 mean in PromiseKit?

Question

What does Void in Swift 4 mean? If I have a function to fulfill, as follows:

func someFunc() -> Promise<Void> {
    fulfill()
}

an error shows, and it only works if:

fulfill(Void())

Note. Swift 3 supported:

fulfill()

I am using Swift 4, but can someone help explain why Void in Swift 4 has a constructor?

FYI this is probably a Swift 4 bug (well, some on Swift team have told me it's intended, but I expect it will be “fixed” due to this kind of confusion eventually). Also you need not specify `Void`, `fulfill(())` will work. — mxcl, Nov 27 '17 at 20:58

score 6 · Accepted Answer · edited Jan 18 '19 at 08:50

6

Void is defined as an empty tuple in Swift. You can take a look swift-void.

edited Jan 18 '19 at 08:50

Community

answered Oct 27 '17 at 12:38

Enea Dume

1 Answers1