Extending typed Arrays (of primitive types like Bool) in Swift 3?

Question

Previously in Swift 2.2 I\'m able to do:

extension _ArrayType where Generator.Element == Bool{
    var allTrue : Bool{
        return !self.contains(false)
    }         


        

Answer 1

As of Swift 3.1 (included in Xcode 8.3), you can now extend a type with a concrete constraint:

extension Array where Element == Bool {
    var allTrue: Bool {
        return !contains(false)
    }
}

You can also extend Collection instead of Array, but you'll need to constrain Iterator.Element, not just Element.