iOS Swift function with type () -> () -

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im unable create function of type () -> () in swift xcode...
far im @ 

func successblock() -> void {     //code     return () }

but () not () -> ()
want function fit type () -> () because of function:

func logintofacebookwithsuccess(callingviewcontroller: uiviewcontroller, successblock: () -> (), andfailure failureblock: (nserror?) -> ()) {

gonna pass successblock() func variable in there.
i have same problem failureblock
or on wrong way?

thank you, spinhaxo

successblock function.
need closures.

let successblock: () -> () = {   // here... }  let failureblock: (nserror?) -> () = { error in   // error... }

if don't want store them, can define them while calling method this:

logintofacebookwithsuccess(   callingcontroller,   successblock: {     // here...   }, andfailure: { error in     // error...   } )

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