<div dir="ltr"><div>Great proposal! I'm all for this, I think your proposed implementation is pretty good too.</div><div><br></div><div>It would be interesting to expand the proposal to consider more cases in more detail:</div><div> * Concurrency</div><div> * SequenceType versus GeneratorType<br></div><div> * Should a language feature depend on the Standard Library (GeneratorType)? Alternatives:<br></div><div> + func myFunction -> () -> T?</div><div> + func myFunction -> () -> (myFunction_State, myFunction_State -> T?)</div><div> * What happens if you write: guard ... else { yield ... }</div><div> * Use an enum for the state that encapsulates all possible variables in each state</div><div><br></div><div>If you're not familiar with it, there's another thread that discussed similar here:</div><a href="https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151207/001872.html" target="_blank">https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151207/001872.html</a><div><br></div><div>In particular you may be interested in Chris Lattner's comment:</div><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px">I’m very interested in this, but it is clearly out of scope for Swift 3. It should also be considered alongside whatever async/concurrency approach we tackle (likely in swift 4).</blockquote><br>Either way it's worth discussing and working towards :)<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Dec 22, 2015 at 6:03 PM, Félix Cloutier <span dir="ltr"><<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div>There's probably some additional work to do on the proposal document, but I would like to see coroutines in Swift too. The feature has been very successful in other languages like Python and C#, and unless I'm mistaken, work is being done to standardize it in C++.</div><div><br></div><div>Generators are one use case, but resumable functions in general can also be used to make async code look prettier.</div><br><div>
<span style="border-collapse:separate;line-height:normal;border-spacing:0px">Félix</span>
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<br><div><blockquote type="cite"><span class=""><div>Le 22 déc. 2015 à 01:47:05, Susan Cheng via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> a écrit :</div><br></span><div><span class=""><div dir="ltr"><div>here is my proposal for swift lang</div><div><br></div><a href="https://github.com/SusanDoggie/swift-evolution/blob/master/proposals/0018-coroutine-for-swift.md" target="_blank">https://github.com/SusanDoggie/swift-evolution/blob/master/proposals/0018-coroutine-for-swift.md</a><br></div>
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