Trouble with non-escaping closures in Swift 3

Question

I have an extension Array in the form of:

extension Array
{
    private func someFunction(someClosure: (() -> Int)?)
    {
        // Do Some         


        

Answer 1

As already said, Optional closures are escaping. An addition though:

Swift 3.1 has a withoutActuallyEscaping helper function that can be useful here. It marks a closure escaping only for its use inside a passed closure, so that you don't have to expose the escaping attribute to the function signature.

Can be used like this:

extension Array {

    private func someFunction(someClosure: (() -> Int)?) {
        someClosure?()
    }

    func someOtherFunction(someOtherClosure: () -> Int) {
        withoutActuallyEscaping(someOtherClosure) {
            someFunction(someClosure: $0)
        }
    }
}


let x = [1, 2, 3]

x.someOtherFunction(someOtherClosure: { return 1 })

Hope this is helpful!