<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div style="margin: 0px; line-height: normal; font-family: Menlo;" class=""><br class=""></div></div><div><blockquote type="cite" class=""><div class="">On Jan 2, 2016, at 22:38, Douglas Gregor via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class=""><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>* What is your evaluation of the proposal?<br class=""></div></div></div></div></div></blockquote><div> </div><div>Taking an example from the swift source to compare an alternative, `type`, we have</div><div><br class=""></div><div><div class=""><div style="margin: 0px; line-height: normal; font-family: Menlo;" class=""><div style="font-family: Helvetica;" class=""><div style="margin: 0px; line-height: normal; font-family: Menlo;" class=""><font color="#5c0700" size="2" class="">public protocol _CollectionWrapperType : _SequenceWrapperType {</font></div><div style="margin: 0px; line-height: normal; font-family: Menlo;" class=""><font color="#5c0700" size="2" class=""> associatedtype Base : CollectionType</font></div><div style="margin: 0px; line-height: normal; font-family: Menlo;" class=""><font color="#5c0700" size="2" class=""> </font><span style="color: rgb(92, 7, 0); font-size: small;" class="">associated</span><span style="color: rgb(92, 7, 0); font-size: small;" class="">type</span><font color="#5c0700" size="2" class=""> Index : ForwardIndexType = Self.Base.Index</font></div><div style="margin: 0px; line-height: normal; font-family: Menlo;" class=""><font color="#5c0700" size="2" class="">}</font></div><div class=""><font color="#5c0700" size="2" class=""><br class=""></font></div><div class="">vs</div></div></div><div style="margin: 0px; line-height: normal; font-family: Menlo;" class=""><font color="#5c0700" size="2" class=""><br class=""></font></div><div style="margin: 0px; line-height: normal; font-family: Menlo;" class=""><font color="#5c0700" size="2" class="">public protocol _CollectionWrapperType : _SequenceWrapperType {</font></div><div style="margin: 0px; line-height: normal; font-family: Menlo;" class=""><font color="#5c0700" size="2" class=""> type Base : CollectionType</font></div><div style="margin: 0px; line-height: normal; font-family: Menlo;" class=""><font color="#5c0700" size="2" class=""> type Index : ForwardIndexType = Self.Base.Index</font></div><div style="margin: 0px; line-height: normal; font-family: Menlo;" class=""><font color="#5c0700" size="2" class="">}</font></div></div><div class=""><br class=""></div><div class=""><div style="margin: 0px; line-height: normal;" class="">I think the version with `associatedtype` is a bit verbose, but that doesn’t seem like a big problem. It might read a little more clearly as well. I wouldn’t be unhappy with either of these alternatives, but `associatedtype` seems like a good choice.</div></div></div><br class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class=""><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>* Is the problem being addressed significant enough to warrant a change to Swift?<br class=""></div></div></div></div></div></blockquote>Yes. I think it `typealias` should be used only as the swift equivalent of a C typedef.</div><div><br class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class=""><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>* Does this proposal fit well with the feel and direction of Swift?<br class=""></div></div></div></div></div></blockquote>Yes, because we want to improve readability and understandability.</div><div><br class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class=""><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>* If you have you used other languages or libraries with a similar feature, how do you feel that this proposal compares to those?<br class=""></div></div></div></div></div></blockquote><div>I haven’t used another language with this feature.</div><br class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class=""><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>* How much effort did you put into your review? A glance, a quick reading, or an in-depth study?<br class=""></div></div></div></div></div></blockquote><div>In depth study.</div><br class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class=""><br class=""></div><div class="">More information about the Swift evolution process is available at</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span><a href="https://github.com/apple/swift-evolution/blob/master/process.md" class="">https://github.com/apple/swift-evolution/blob/master/process.md</a></div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Cheers,</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Doug Gregor</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Review Manager</div></div><div class=""><br class=""></div>
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