[swift-evolution] [Proposal] Make optional protocol methods first class citizens

Haravikk swift-evolution at haravikk.me
Wed Mar 30 09:18:33 CDT 2016

I’m not sure, why not just define an additional protocol with the optional method(s) you’d like to add? The whole point of protocols is to guarantee access to some baseline capability, so I’m not sure that optional capabilities are well covered except by adding new protocols that extend each other.

Objective-C conversion has the ability because Objective-C is unusual by comparison thanks to its ability to have “method calls” (messages) with no actual destination. I think it’s good for Swift to be more structured and strict than that.

> On 30 Mar 2016, at 15:08, Yuval Tal via swift-evolution <swift-evolution at swift.org> wrote:
> Hi,
> I find that optional protocol methods to be very useful. However, there is a caveat -- it needs to be mapped to @objc. This puts a set of limitations, such as: structures cannot be used as parameters as it does not map to objective-c. What do you think about removing the requirement of using @objc and allow to create optional methods without these limitations?
> Thank you,
> -Yuval

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