copy copy is a top-level function in the Swift standard library: func copy<T>(_ value: T) -> T { return value } せやなmove The Swift optimizer will generally try to move values around instead of copying them, but it can be useful to force its hand. For this reason, we propose the move function. Conceptually, move is simply a top-level function in the Swift standard library: func move<T>(_ value: T) -> T { return value }