Thanks for writing this up. Some quick points.
Firstly, I think it is best if the `init(_ forwardeeReturnValue: Forwardee)`-style initializer be replaced by something with a distinctly-named argument, e.g. `init(forwardeeReturnValue value: Forwardee)`. For use with actual wrapper types the “init(_ wrappedValue: Wrapped)`-style init is too valuable to “claim” for this purpose (in particular b/c we may want to “adjust" the forwarded result); it’s IMHO better if we use a distinct `init` for the forwardee-return-value scenario so we know where the value is coming from. Secondly, I would prefer partial-forwarding be given more consideration, b/c it seems somewhat common for me in practice at this time. EG: I would do the following somewhat frequently: struct FooIdentifier: Equatable, Comparable, Hashable class Foo { let identifier: FooIdentifier let name: String forward Hashable to identifier } func ==(lhs: Foo, rhs: Foo) -> Bool { return lhs.identifier == rhs.identifier && lhs.name == rhs.name } …even though I agree that full-forwarding would the most-common scenario. I have a few other similar cases involving non-standard-library types but they all fit the same basic pattern as above for `Hashable`. Finally, I’m actually at a bit of a loss for too many uses for the generic forwarding mechanism; if it was added I’d use it to streamline some wrapper types, but beyond that I’m not seeing all that many places where I’d do much more than that with this feature if added. Any chance at adding a few more-concrete motivating examples for the fancier cases? > On Dec 29, 2015, at 10:37 AM, Matthew Johnson via swift-evolution > <swift-evolution@swift.org> wrote: > > I have completed a first draft of a proposal to introduce automatic protocol > forwarding. I’m looking forward to feedback from everyone! _______________________________________________ swift-evolution mailing list swift-evolution@swift.org https://lists.swift.org/mailman/listinfo/swift-evolution