<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="">+1 for using ::<div class=""><br class=""></div><div class="">It’s got precedence in many other languages (C++, Java 8+, Kotlin) to reference static methods, and it’s sufficiently different enough from `.` to avoid confusing people.</div><div class=""><br class=""></div><div class="">While I personally resist letting C++ influence Swift syntactically, this makes a lot of sense to me.</div><div class=""><br class=""></div><div class="">— Harlan</div><div class=""><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Apr 5, 2017, at 8:27 PM, Tony Allevato 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=""><div dir="ltr" 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=""><br class=""><br class=""><div class="gmail_quote"><div dir="ltr" class="">On Wed, Apr 5, 2017 at 4:56 PM Douglas Gregor via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:<br class=""></div><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 class="gmail_msg" style="word-wrap: break-word;"><p class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);">Hello Swift community,</p><p class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);">The second review of SE-0161 "Smart KeyPaths: Better Key-Value Coding for Swift" begins now and runs through April 9, 2017. The revised proposal is available here:</p><blockquote class="gmail_msg" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px 1em; border-left-width: 0.25em; border-left-style: solid; border-left-color: rgb(223, 226, 229); background-color: rgb(255, 255, 255);"><div class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px;"><font color="#6a737d" face="-apple-system, BlinkMacSystemFont, Segoe UI, Helvetica, Arial, sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol" size="3" class="gmail_msg"><a href="https://github.com/apple/swift-evolution/blob/master/proposals/0161-key-paths.md" class="gmail_msg" target="_blank">https://github.com/apple/swift-evolution/blob/master/proposals/0161-key-paths.md</a></font></div></blockquote><p class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);">The core team’s feedback from the first review of this proposal can be viewed at:</p><div class="gmail_msg"><blockquote class="gmail_msg" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px 1em; border-left-width: 0.25em; border-left-style: solid; border-left-color: rgb(223, 226, 229); background-color: rgb(255, 255, 255);"><div class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px;"><font face=".AppleSystemUIFont" size="3" class="gmail_msg"><a href="https://lists.swift.org/pipermail/swift-evolution-announce/2017-April/000342.html" class="gmail_msg" target="_blank">https://lists.swift.org/pipermail/swift-evolution-announce/2017-April/000342.html</a></font></div></blockquote></div></div><div class="gmail_msg" style="word-wrap: break-word;"><p class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);">Reviews are an important part of the Swift evolution process. All reviews should be sent to the swift-evolution mailing list at</p><blockquote class="gmail_msg" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px 1em; color: rgb(106, 115, 125); border-left-width: 0.25em; border-left-style: solid; border-left-color: rgb(223, 226, 229); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);"><div class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px;"><a href="https://lists.swift.org/mailman/listinfo/swift-evolution" class="gmail_msg" target="_blank" style="box-sizing: border-box; background-color: transparent; color: rgb(3, 102, 214); text-decoration: none;">https://lists.swift.org/mailman/listinfo/swift-evolution</a></div></blockquote><p class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);">or, if you would like to keep your feedback private, directly to the review manager. When replying, please try to keep the proposal link at the top of the message:</p><blockquote class="gmail_msg" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px 1em; border-left-width: 0.25em; border-left-style: solid; border-left-color: rgb(223, 226, 229); background-color: rgb(255, 255, 255);"><p class="gmail_msg" style="color: rgb(106, 115, 125); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; box-sizing: border-box; margin-top: 0px; margin-bottom: 16px;">Proposal link:</p><blockquote class="gmail_msg" style="box-sizing: border-box; margin: 0px; padding: 0px 1em; border-left-width: 0.25em; border-left-style: solid; border-left-color: rgb(223, 226, 229);"><div class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px;"><font color="#6a737d" face="-apple-system, BlinkMacSystemFont, Segoe UI, Helvetica, Arial, sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol" size="3" class="gmail_msg"><a href="https://github.com/apple/swift-evolution/blob/master/proposals/0161-key-paths.md" class="gmail_msg" target="_blank">https://github.com/apple/swift-evolution/blob/master/proposals/0161-key-paths.md</a></font></div></blockquote></blockquote><blockquote class="gmail_msg" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px 1em; color: rgb(106, 115, 125); border-left-width: 0.25em; border-left-style: solid; border-left-color: rgb(223, 226, 229); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);"><div class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px;">Reply text</div></blockquote><blockquote class="gmail_msg" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px 1em; color: rgb(106, 115, 125); border-left-width: 0.25em; border-left-style: solid; border-left-color: rgb(223, 226, 229); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);"><blockquote class="gmail_msg" style="box-sizing: border-box; margin: 0px; padding: 0px 1em; border-left-width: 0.25em; border-left-style: solid; border-left-color: rgb(223, 226, 229);"><div class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px;">Other replies</div></blockquote></blockquote><h5 class="gmail_msg" style="box-sizing: border-box; margin-top: 24px; margin-bottom: 16px; font-size: 0.875em; line-height: 1.25; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; background-color: rgb(255, 255, 255);"><a id="m_-5326029133873784831user-content-what-goes-into-a-review-1" class="gmail_msg m_-5326029133873784831anchor" href="https://github.com/apple/swift-evolution/pulls#what-goes-into-a-review-1" target="_blank" style="box-sizing: border-box; background-color: transparent; color: rgb(3, 102, 214); text-decoration: none; float: left; padding-right: 4px; line-height: 1;"><u class="gmail_msg"></u><u class="gmail_msg"></u><u class="gmail_msg"></u><u class="gmail_msg"></u></a>What goes into a review?</h5><p class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);">The goal of the review process is to improve the proposal under review through constructive criticism and, eventually, determine the direction of Swift. When writing your review, here are some questions you might want to answer in your review:</p><ul class="gmail_msg" style="box-sizing: border-box; padding-left: 2em; margin-top: 0px; margin-bottom: 16px; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);"><li class="gmail_msg" style="box-sizing: border-box;">What is your evaluation of the proposal?</li></ul></div></blockquote><div class="">Full on +1 now. Thank you for reverting the heavy syntax from the previous revision. This makes the feature much more usable, and the future alignment with unbound function references will be welcome in terms of consistency.<br class=""></div><div class=""><br class=""></div><div class="">I guess I'll throw out my own color for the shed: <span style="font-size: 13px;" class="">Was :: already considered as well? It at least has some precedent in C++ and later Java for similar purposes, and it's not currently an operator in the language. We could have:</span></div><div class=""><div style="font-size: 13px;" class=""><br class=""></div><div style="font-size: 13px;" class=""> Person.foo // a reference to Person's static property foo</div><div style="font-size: 13px;" class=""> Person::foo // a keypath to Person's instance property foo</div><div style="font-size: 13px;" class=""><br class=""></div><div style="font-size: 13px;" class="">Then, for SE-0042:</div><div style="font-size: 13px;" class=""><br class=""></div><div style="font-size: 13px;" class=""> Person::someFunction // a function reference of type (Person, ...other args...) -> Result <br class=""></div><div style="font-size: 13px;" class=""><br class=""></div><div style="font-size: 13px;" class="">But that might make the implied case look strange. Would we have to have this?</div><div style="font-size: 13px;" class=""><br class=""></div><div style="font-size: 13px;" class=""> print(luke[keyPath: ::.friends[0].name])<br class=""></div><div style="font-size: 13px;" class=""><br class=""></div><div style="font-size: 13px;" class="">Without the period after the "::", it's inconsistent with other type inference sites, but with it, it's kind of ugly.</div><br class="inbox-inbox-Apple-interchange-newline"></div><div class="">That being said, if the backslash ends up being the operator of record for this feature because other options would be poor choices for other reasons, I'm ok with that.</div><div class=""><br class=""></div><div class="">My feedback on the rest of the proposal review bullets is the same as before; I won't repeat it here.</div><div class=""><br class=""></div><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 class="gmail_msg" style="word-wrap: break-word;"><ul class="gmail_msg" style="box-sizing: border-box; padding-left: 2em; margin-top: 0px; margin-bottom: 16px; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);"><li class="gmail_msg" style="box-sizing: border-box; margin-top: 0.25em;">Is the problem being addressed significant enough to warrant a change to Swift?</li><li class="gmail_msg" style="box-sizing: border-box; margin-top: 0.25em;">Does this proposal fit well with the feel and direction of Swift?</li><li class="gmail_msg" style="box-sizing: border-box; margin-top: 0.25em;">If you have used other languages or libraries with a similar feature, how do you feel that this proposal compares to those?</li><li class="gmail_msg" style="box-sizing: border-box; margin-top: 0.25em;">How much effort did you put into your review? A glance, a quick reading, or an in-depth study?</li></ul><p class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);">More information about the Swift evolution process is available at</p><blockquote class="gmail_msg" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px 1em; color: rgb(106, 115, 125); border-left-width: 0.25em; border-left-style: solid; border-left-color: rgb(223, 226, 229); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);"><div class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px;"><a href="https://github.com/apple/swift-evolution/blob/master/process.md" class="gmail_msg" target="_blank" style="box-sizing: border-box; background-color: transparent; color: rgb(3, 102, 214); text-decoration: none;">https://github.com/apple/swift-evolution/blob/master/process.md</a></div></blockquote><p class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);">Thank you,</p><p class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);">-Doug</p></div><div class="gmail_msg" style="word-wrap: break-word;"><p class="gmail_msg" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; 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