<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=""><blockquote type="cite" class="">• What is your evaluation of the proposal?<br class=""></blockquote><div class=""><br class=""></div><div class="">+1, been a supporter of this idea from the very beginning.</div><br class=""><blockquote type="cite" class="">• Is the problem being addressed significant enough to warrant a change to Swift?<br class=""></blockquote><div class=""><br class=""></div><div class="">It is when doing hybrid (Objective-C plus Swift) development.</div><br class=""><blockquote type="cite" class="">• Does this proposal fit well with the feel and direction of Swift?<br class=""></blockquote><div class=""><br class=""></div><div class="">Not with the direction of Swift itself but it certainly helps with the transition from Objective-C.</div><br class=""><blockquote type="cite" class="">• How much effort did you put into your review? A glance, a quick reading, or an in-depth study?<br class=""></blockquote><div class=""><br class=""></div><div class="">Been following the topic since the beginning.</div><div class=""><br class=""></div><div class="">–––</div><div class=""><br class=""></div><div class="">One thing,</div><div class=""><br class=""></div><div class="">I noticed the proposal includes <font face="Menlo" class="">@warn_unused_result</font> attribute in one of code examples. As this will be removed per SE-0047, I suggest removing the attribute from the proposal code examples.</div><br class=""><div class="">
<div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><font color="#929292" class=""><br class="Apple-interchange-newline">Pozdrawiam – Regards,</font></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><font color="#929292" class="">Adrian Kashivskyy</font></div>
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<br class=""><div><blockquote type="cite" class=""><div class="">Wiadomość napisana przez Brent Royal-Gordon via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> w dniu 06.04.2016, o godz. 03:08:</div><br class="Apple-interchange-newline"><div class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">(Sorry, sent without finishing a sentence.)</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><blockquote type="cite" class=""><a href="https://github.com/apple/swift-evolution/blob/master/proposals/0058-objectivecbridgeable.md" class="">https://github.com/apple/swift-evolution/blob/master/proposals/0058-objectivecbridgeable.md</a><br class=""></blockquote><br class=""><blockquote type="cite" class=""> But then, these *are* intended to be full-width type conversions,<br class=""> are they not? Why not these:<br class=""><br class=""> init?(_ source: ObjectiveCType)<br class=""> init(_ source: ObjectiveCType?)<br class=""><br class=""> ? If any of these transformations are wrong, it would good to have<br class=""> a rationale as to why.<br class=""></blockquote><br class="">I really don't like these two differing only by the optionality of their argument and return type, especially if they're going to have *no* argument label, which will make them look very attractive. And the unconditional one has many strange semantics—the extra layer of optionality on the argument, the fact that it may *lazily* crash if you access a sub-object which isn't permitted, etc. So I would at least label that one:<br class=""><br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>init?(_ source: ObjectiveCType)<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>init(forced source: ObjectiveCType?)<br class=""><br class="">I'm also a little worried about having an `init?(_:)` when a particular conversion might reasonably always succeed. The lack of a label will imply to users that this is something they can use directly;<span class="Apple-converted-space"> </span><br class=""></blockquote><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">if the conversion always succeeds, though, it will unnecessarily be returning an optional value. (And from what I can tell, you can't satisfy an optional return value in a protocol with a member having a non-optional return value. Not sure why that is.)</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">--<span class="Apple-converted-space"> </span></span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Brent Royal-Gordon</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; 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