<div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Wed, Jun 22, 2016 at 11:04 AM Chris Lattner via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello Swift community,<br>
<br>
The review of "SE-0095: Replace `protocol<P1,P2>` syntax with `Any<P1,P2>`" begins now and runs through June 27. The proposal is available here:<br>
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<a href="https://github.com/apple/swift-evolution/blob/master/proposals/0095-any-as-existential.md" rel="noreferrer" target="_blank">https://github.com/apple/swift-evolution/blob/master/proposals/0095-any-as-existential.md</a><br>
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Reviews are an important part of the Swift evolution process. All reviews should be sent to the swift-evolution mailing list at<br>
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<a href="https://lists.swift.org/mailman/listinfo/swift-evolution" rel="noreferrer" target="_blank">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br>
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or, if you would like to keep your feedback private, directly to the review manager.<br>
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What goes into a review?<br>
<br>
The goal of the review process is to improve the proposal under review through constructive criticism and contribute to the direction of Swift. When writing your review, here are some questions you might want to answer in your review:<br>
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* What is your evaluation of the proposal?<br></blockquote><div><br></div><div>+1. This syntax is clean and its meaning is very clear ("what is A & B? A type that conforms to A and B").</div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
* Is the problem being addressed significant enough to warrant a change to Swift?<br></blockquote><div><br></div><div>Yes, and it's important to address now. As the type system becomes richer in the future with the completion of generics, combined with Swift's protocol-driven design philosophies, this feature will get much heavier use going forward. Having a clean, simple, terse syntax to express multiple protocol conformances (and eventually concrete type relationships) will make those features much easier to use without being cluttered by keywords and potential nested-angle-bracket hell.</div><div><br></div><div>The previously proposed Any<...> syntax suffers from ambiguity of meaning: does it mean "a type that conforms to any of these..." or "any type that conforms to all of these..."? Turns out it's the latter. The use of "&" removes that ambiguity completely.</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
* Does this proposal fit well with the feel and direction of Swift?<br></blockquote><div><br></div><div>Yes. It will go a long way toward making protocol-driven designs and generics great to use.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
* If you have used other languages or libraries with a similar feature, how do you feel that this proposal compares to those?<br>
* How much effort did you put into your review? A glance, a quick reading, or an in-depth study?<br></blockquote><div><br></div><div>Read the proposal and participated a small amount in the earlier discussions.</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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More information about the Swift evolution process is available at<br>
<br>
<a href="https://github.com/apple/swift-evolution/blob/master/process.md" rel="noreferrer" target="_blank">https://github.com/apple/swift-evolution/blob/master/process.md</a><br>
<br>
Thank you,<br>
<br>
-Chris Lattner<br>
Review Manager<br>
<br>
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