[swift-evolution] Figuring out what you get for free

Kyle Murray kyle_murray at apple.com
Thu Sep 14 17:10:23 CDT 2017

> However, I find that I'm having trouble figuring out what I get for free when I implement a protocol. In principle, I like conditional conformances and synthesized implementation of protocol methods, but I find that they both make it harder to figure out what I need to implement, and what are going to be the performance characteristics of methods that I choose to not implement.

If you're thinking specifically about the standard library, the documentation for protocols like Sequence shows whether a member is required, and whether it provides a default implementation.

https://developer.apple.com/documentation/swift/sequence#2923865 <https://developer.apple.com/documentation/swift/sequence#2923865>

Have you noticed that before, or is it still tricky to find requirements given the presentation?

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