<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div><blockquote type="cite" class=""><div class="">On Dec 9, 2017, at 10:32 AM, Xiaodi Wu 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=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">On Sat, Dec 9, 2017 at 11:20 Steven Brunwasser <</span><a href="mailto:sbrunwasser@gmail.com" 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-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">sbrunwasser@gmail.com</a><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">> wrote:</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><div class="gmail_quote" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;"><div dir="auto" class=""><div class="">Just wanted to give my 2¢</div><div class=""><br class=""></div><div class="">¢</div><div class="">I don’t like empty protocols—they feel like an abuse of the feature.</div></div></blockquote><div dir="auto" class=""><br class=""></div><div dir="auto" class="">As has been discussed here before, protocols aren’t about bags of syntax but rather about semantics. Empty protocols are explicitly a demonstration of this settled principle and are very much consistent with the direction of Swift.</div></div></div></blockquote></div><div class=""><br class=""></div><div class="">I also think it should be an attribute.</div><div class=""><br class=""></div><div class="">The last time I said this, I pointed out that this was a protocol which:</div><div class=""><br class=""></div><div class="">1. Has no formal members,</div><div class="">2. But imposes informal requirements enforced by the compiler,</div><div class="">3. Permits and uses arbitrary overloads, and</div><div class="">4. Cannot be usefully used in a generic context or as a type constraint,</div><div class=""><br class=""></div><div class="">None of which are true of ordinary protocols. Since then, we have added:</div><div class=""><br class=""></div><div class="">5. Can only be conformed to in the main declaration.</div><div class=""><br class=""></div><div class="">This is looking less like a protocol by the day. The square-peg grooves in the round hole are getting deeper and more splintery with every revision.</div><div class=""><br class=""></div><div class="">
<span class="Apple-style-span" style="border-collapse: separate; font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; line-height: normal; border-spacing: 0px;"><div class=""><div style="font-size: 12px; " class="">-- </div><div style="font-size: 12px; " class="">Brent Royal-Gordon</div><div style="font-size: 12px; " class="">Architechies</div></div></span>
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