<div dir="ltr">Good grief. I think you're right. <div><br></div><div>Some how, a long time ago, I got it into my head that the order in which each part of the ternary got evaluated would cause problems for this kind of thing.</div><div><br></div><div>I've had a huge blindspot and I've been railing on the list for something I don't need for weeks. </div><div><br></div><div>Wow, I couldn't be more embarassed. </div><div><br></div><div>But I'm happy too, because I can go ahead and just use a chained ternary.<br></div><div><br></div><div>Sorry all, and thanks.</div><div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, May 23, 2016 at 6:26 PM, Dany St-Amant <span dir="ltr"><<a href="mailto:dsa.mls@icloud.com" target="_blank">dsa.mls@icloud.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><br><div><span class=""><blockquote type="cite"><div>Le 20 mai 2016 à 07:14, Charles Constant via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> a écrit :</div><br><div><div dir="ltr">I wrote some code tonight to experiment with this kind of thing. I apologize if it's off-topic for the thread, but it might be useful to others who want to experiment. <div><br></div><div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(145,145,145);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(145,145,145);background-color:rgb(68,68,68)"><span>//: Playground - noun: a place where people can play</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span style="color:rgb(194,52,155)">import</span><span> Cocoa</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(194,52,155);background-color:rgb(68,68,68)"><span>infix</span><span style="color:rgb(255,255,255)"> </span><span>operator</span><span style="color:rgb(255,255,255)"> • { </span><span>precedence</span><span style="color:rgb(255,255,255)"> </span><span style="color:rgb(139,132,207)">180</span><span style="color:rgb(255,255,255)"> }</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(194,52,155);background-color:rgb(68,68,68)"><span>infix</span><span style="color:rgb(255,255,255)"> </span><span>operator</span><span style="color:rgb(255,255,255)"> → { </span><span>associativity</span><span style="color:rgb(255,255,255)"> left </span><span>precedence</span><span style="color:rgb(255,255,255)"> </span><span style="color:rgb(139,132,207)">70</span><span style="color:rgb(255,255,255)"> }</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(194,52,155);background-color:rgb(68,68,68)"><span>infix</span><span style="color:rgb(255,255,255)"> </span><span>operator</span><span style="color:rgb(255,255,255)"> … { </span><span>associativity</span><span style="color:rgb(255,255,255)"> right </span><span>precedence</span><span style="color:rgb(255,255,255)"> </span><span style="color:rgb(139,132,207)">60</span><span style="color:rgb(255,255,255)"> }</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span style="color:rgb(194,52,155)">func</span><span> → <T>( lhs: </span><span style="color:rgb(0,175,202)">Bool</span><span>, rhs: </span><span style="color:rgb(0,175,202)">T</span><span> ) -> </span><span style="color:rgb(0,175,202)">T</span><span>? {</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span><span style="white-space:pre-wrap"> </span></span><span style="color:rgb(194,52,155)">return</span><span> lhs ? rhs : </span><span style="color:rgb(194,52,155)">nil</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span>}</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span style="color:rgb(194,52,155)">func</span><span> … <T>( lhs:</span><span style="color:rgb(0,175,202)">T</span><span>?, rhs:</span><span style="color:rgb(0,175,202)">T</span><span> ) -> </span><span style="color:rgb(0,175,202)">T</span><span> {</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span><span style="white-space:pre-wrap"> </span></span><span style="color:rgb(194,52,155)">return</span><span> lhs != </span><span style="color:rgb(194,52,155)">nil</span><span> ? lhs! : rhs</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span>}</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span style="color:rgb(194,52,155)">func</span><span> depends<I,O>( dep:</span><span style="color:rgb(0,175,202)">I</span><span>, </span><span style="color:rgb(194,52,155)">_</span><span> closure: (</span><span style="color:rgb(0,175,202)">I</span><span>)->(</span><span style="color:rgb(0,175,202)">O</span><span>) ) -> </span><span style="color:rgb(0,175,202)">O</span><span> {</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span><span style="white-space:pre-wrap"> </span></span><span style="color:rgb(194,52,155)">return</span><span> closure( dep )</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span>}</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span style="color:rgb(194,52,155)">func</span><span> • <I,O>( lhs: </span><span style="color:rgb(0,175,202)">I</span><span>, rhs: (</span><span style="color:rgb(0,175,202)">I</span><span>)->(</span><span style="color:rgb(0,175,202)">O</span><span>) ) -> </span><span style="color:rgb(0,175,202)">O</span><span> {</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span><span style="white-space:pre-wrap"> </span></span><span style="color:rgb(194,52,155)">return</span><span> </span><span style="color:rgb(147,200,106)">depends</span><span>( lhs, rhs )</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span>}</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(145,145,145);background-color:rgb(68,68,68)"><span>/* Example using "depends" */</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(194,52,155);background-color:rgb(68,68,68)"><span>let</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span><span style="white-space:pre-wrap"> </span>str:</span><span style="color:rgb(0,175,202)">String</span><span>,</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span><span style="white-space:pre-wrap"> </span>i = </span><span style="color:rgb(139,132,207)">7</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(147,200,106);background-color:rgb(68,68,68)"><span>str</span><span style="color:rgb(255,255,255)"> = </span><span>depends</span><span style="color:rgb(255,255,255)">( </span><span>i</span><span style="color:rgb(255,255,255)"> ){</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span><span style="white-space:pre-wrap"> </span>$0==</span><span style="color:rgb(139,132,207)">2</span><span> </span><span style="color:rgb(147,200,106)">→</span><span> </span><span style="color:rgb(228,68,72)">"two"</span><span> </span><span style="color:rgb(147,200,106)">…</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span><span style="white-space:pre-wrap"> </span>$0==</span><span style="color:rgb(139,132,207)">3</span><span> </span><span style="color:rgb(147,200,106)">→</span><span> </span><span style="color:rgb(228,68,72)">"three"</span><span> </span><span style="color:rgb(147,200,106)">…</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span><span style="white-space:pre-wrap"> </span>$0==</span><span style="color:rgb(139,132,207)">4</span><span> </span><span style="color:rgb(147,200,106)">→</span><span> </span><span style="color:rgb(228,68,72)">"four"</span><span> </span><span style="color:rgb(147,200,106)">…</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(228,68,72);background-color:rgb(68,68,68)"><span style="color:rgb(255,255,255)"><span style="white-space:pre-wrap"> </span></span><span>"other"</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span>}</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div></div></div></div></blockquote><div><br></div></span><div>Hmm… replacing -> by ?, and … by : you get:</div><div><br></div><div><span class=""><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><span style="color:#4f8187">str</span> = <span style="color:#31595d">depends</span>( <span style="color:#4f8187">i</span> ){</div></span><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"> $0==<span style="color:#272ad8">2</span> ? <span style="color:#d12f1b">"two"</span> :</div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"> $0==<span style="color:#272ad8">3</span> ? <span style="color:#d12f1b">"three"</span> :</div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"> $0==<span style="color:#272ad8">4</span> ? <span style="color:#d12f1b">"four"</span> :</div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(209,47,27)"><span style="color:#000000"> </span>"other"</div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">}</div><div><br></div><div>which work as is without a need to define new operators.</div><span class="HOEnZb"><font color="#888888"><div><br></div><div>Dany</div><div><br></div></font></span></div><div><div class="h5"><blockquote type="cite"><div><div dir="ltr"><div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(145,145,145);background-color:rgb(68,68,68)"><span>/* Example using "•" operator as "depends" */</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span style="color:rgb(194,52,155)">enum</span><span> People { </span><span style="color:rgb(194,52,155)">case</span><span> Kurtz, Popescu, Lime, Martins }</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span style="color:rgb(194,52,155)">enum</span><span> Order { </span><span style="color:rgb(194,52,155)">case</span><span> First, Second, Third, Unknown }</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(194,52,155);background-color:rgb(68,68,68)"><span>let</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span><span style="white-space:pre-wrap"> </span>order:</span><span style="color:rgb(147,200,106)">Order</span><span>,</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span><span style="white-space:pre-wrap"> </span>person:</span><span style="color:rgb(147,200,106)">People</span><span> = .</span><span style="color:rgb(147,200,106)">Lime</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(147,200,106);background-color:rgb(68,68,68)"><span>order</span><span style="color:rgb(255,255,255)"> = </span><span>person</span><span style="color:rgb(255,255,255)"> </span><span>•</span><span style="color:rgb(255,255,255)"> {</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(147,200,106);background-color:rgb(68,68,68)"><span style="color:rgb(255,255,255)"><span style="white-space:pre-wrap"> </span>$0 </span><span>==</span><span style="color:rgb(255,255,255)"> .</span><span>Kurtz</span><span style="color:rgb(255,255,255)"> </span><span>→</span><span style="color:rgb(255,255,255)"> .</span><span>First</span><span style="color:rgb(255,255,255)"> </span><span>…</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(147,200,106);background-color:rgb(68,68,68)"><span style="color:rgb(255,255,255)"><span style="white-space:pre-wrap"> </span>$0 </span><span>==</span><span style="color:rgb(255,255,255)"> .</span><span>Popescu</span><span style="color:rgb(255,255,255)"> </span><span>→</span><span style="color:rgb(255,255,255)"> .</span><span>Second</span><span style="color:rgb(255,255,255)"> </span><span>…</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(147,200,106);background-color:rgb(68,68,68)"><span style="color:rgb(255,255,255)"><span style="white-space:pre-wrap"> </span>$0 </span><span>==</span><span style="color:rgb(255,255,255)"> .</span><span>Lime</span><span style="color:rgb(255,255,255)"> </span><span>→</span><span style="color:rgb(255,255,255)"> .</span><span>Third</span><span style="color:rgb(255,255,255)"> </span><span>…</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(147,200,106);background-color:rgb(68,68,68)"><span style="color:rgb(255,255,255)"><span style="white-space:pre-wrap"> </span>.</span><span>Unknown</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68)"><span>}</span></div><div style="margin:0px;font-size:10px;line-height:normal;font-family:'Fantasque Sans Mono';color:rgb(255,255,255);background-color:rgb(68,68,68);min-height:12px"><span></span><br></div><div><div><div><br></div><div><div>I also have some trepidation about posting it here, because it might have bugs. I wans't sure what "precedence" and "associativity" should be, for example. But it does make it more convenient to test alternative characters for operators, etc.</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Apr 9, 2016 at 12:05 AM, Vladimir.S via swift-evolution <span dir="ltr"><<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><span><br>
On 09.04.2016 9:31, Brent Royal-Gordon wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
This design is still very much under development—it hasn't even been reviewed, let alone added to the language. Here's the draft proposal:<<a href="https://github.com/jtbandes/swift-evolution/blob/case-enumerable/proposals/0000-derived-collection-of-enum-cases.md" rel="noreferrer" target="_blank">https://github.com/jtbandes/swift-evolution/blob/case-enumerable/proposals/0000-derived-collection-of-enum-cases.md</a>><br>
<br>
I'm not saying that this will necessarily be a solution that ends up being accepted—I'm merely saying that yes, it's something people are thinking about and designing; it's just been inactive for a few weeks.<br>
</blockquote>
<br></span>
Oh, I see. Thank you for letting know. Just missed "you would be able" in your previous message, did read it as "you are able", so was trying to find this in current Swift version. OK, glad to know that most likely we'll have improvements in enums eterations for Swift 3.0.<div><div><br>
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