On Sat, Jul 11, 2015 at 8:33 AM, William ML Leslie < william.leslie....@gmail.com> wrote:
> Protocols (as seen in Clojure, which Swift borrows from somewhat, and > Go) are a bit more than interfaces. It's perfectly reasonable for a > single 'type' to implement the same protocol in a variety of ways. At > least, in Clojure; maybe they boogered this in the other languages. > > I guess they are more like bitc's original capsule concept. > William: Did you actually look at the Swift reference when you made this statement? I don't see anything in the language specification that would allow a protocol to be implemented in multiple ways. Clojure may allow that, but Swift does not appear to do so. The things you can specify as compatibility requirements in a Protocol are a bit richer than I've seen in many other Interface specifications, but they don't step (conceptually) beyond the idea that an Interface defines a contract about which methods must be present. shap
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