<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>You may want people to have the flexibility of using either of the two approaches :).<br><br>Sent from my iPhone</div><div><br>On 29 Feb 2016, at 17:16, David Owens II <<a href="mailto:david@owensd.io">david@owensd.io</a>> wrote:<br><br></div><blockquote type="cite"><div><meta http-equiv="Content-Type" content="text/html charset=utf-8"><div class="">Building the functionality into abstract classes artificially limits the context for the problem though.</div><div class=""><br class=""></div><div class="">For example, there are cases where it's desirable for a protocol to be able to specify the storage mechanism for a property. If a protocol gains the ability to do that, that's just one benefit that abstract classes provide that is no longer necessary.</div><div class=""><br class=""></div><div class="">-David</div><br class=""><div><blockquote type="cite" class=""><div class="">On Feb 28, 2016, at 9:28 AM, Goffredo Marocchi via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="content-type" content="text/html; charset=utf-8" class=""><div dir="auto" class=""><div class="">So far while pushing for protocol oriented programming as one of Swift's distinctive features, the Swift team (or at least Chris Lattner) stated that inheritance is not a patter which is bad per se, it is a pattern which has its uses and it is fully supported by Swift just as much as other patterns Swift makes available. In my opinion of you have a feature, this feature should not fight with a hand tied behind its back: the "if you do it, do it well" approach :).</div><div class=""><br class=""></div><div class="">Answers like this seem to be the next best thing from asking to remove inheritance outright or to limit it more. Improving protocols, improving functional programming support, etc... all of that is orthogonal to improving OOP through class inheritance. </div><div class="">Support for abstract classes does not force people to use inheritance. Instead of doc using energies pushing down proposals that advocate for improving class based inheritance, I see energy better spent in making proposals that improve protocols unless they get filled by inheritance die hard afraid of the success of protocols meaning a death sentence for inheritance :).</div><div class=""><br class=""><div class="">Sent from my iPhone</div></div><div class=""><br class="">On 28 Feb 2016, at 17:11, Trent Nadeau via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:<br class=""><br class=""></div><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class="">> • What is your evaluation of the proposal?</div><div class="">-1. I would prefer something like mixins that could work without inheritance and would thus also work with value types.</div><div class=""><br class=""></div><div class="">> • Is the problem being addressed significant enough to warrant a change to Swift?</div><div class="">Yes, although I don't think abstract classes that force inheritance and only work for classes is the answer.</div><div class=""><br class=""></div><div class="">> • Does this proposal fit well with the feel and direction of Swift?</div><div class="">No.</div><div class=""><br class=""></div><div class="">> • If you have used other languages or libraries with a similar feature, how do you feel that this proposal compares to those?</div><div class="">My opinion is based on other languages I've used that have better ways to handle this (Ruby, Python, D) as well as the downsides I've seen with abstract classes in Java and C++.<br class=""></div><div class=""><br class=""></div><div class="">> • How much effort did you put into your review? A glance, a quick reading, or an in-depth study?</div><div class="">I've followed the various threads on this topic that have come up since Swift was open-sourced.</div></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Sun, Feb 28, 2016 at 12:02 PM, Антон Жилин <span dir="ltr" class=""><<a href="mailto:swift-evolution@swift.org" target="_blank" class="">swift-evolution@swift.org</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="">My GMail keeps breaking threads. I wrote this in reply to this post of Matthew Johnson:<div class=""><a href="https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20160222/011351.html" target="_blank" class="">https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20160222/011351.html</a><br class=""></div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br class=""><div class="gmail_quote">2016-02-28 19:50 GMT+03:00 Антон Жилин <span dir="ltr" class=""><<a href="mailto:antonyzhilin@gmail.com" target="_blank" class="">antonyzhilin@gmail.com</a>></span>:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="">It would be interesting to know your opinion on "mixins" proposal. Do you need some kind of "abstract classes for structs", perhaps with multiple inheritance, or you find that more elegant architectual solutions to problems can be found, without partially implemented constructs?<div class=""><a href="https://gist.github.com/Anton3/f0550922c1be0fc5447c" target="_blank" class="">https://gist.github.com/Anton3/f0550922c1be0fc5447c</a><br class=""></div></div>
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