[swift-users] override-like keyword for default implementations

Johannes Weiss johannesweiss at apple.com
Tue May 16 10:53:39 CDT 2017

Hi swift-users,

Is there anything like the `override` keyword for making sure that default implementations in protocols are not adding a new function?

An example would be the following:

    protocol FooProto {
        func foo()
    extension FooProto {
        func foo() { /* <-- can I mark this as being a default implementation */
            print("foo default")

Right now, there's a `func foo()` default implementation for `FooProto` but if later of `foo` gets refactored to `bar`, we lose the default implementation which can lead to problems.

Is there anything in Swift (like the `override` keyword) that allows me to say this is a default implementation and not a new method?


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