How to use Swift @autoclosure

Question

I noticed when writing an assert in Swift that the first value is typed as

@autoclosure() -> Bool

with an overloaded method

Answer 1

It's just a way to get rid of the curly braces in a closure call, simple example:

    let nonAutoClosure = { (arg1: () -> Bool) -> Void in }
    let non = nonAutoClosure( { 2 > 1} )

    let autoClosure = { (arg1: @autoclosure () -> Bool) -> Void in }
    var auto = autoClosure( 2 > 1 ) // notice curly braces omitted