<div dir="ltr"><div>possibly off-topic but what i would really find useful is some way of expressing guard/if assignment instead of initialization so that <br><br> let geomSource:UnsafeMutableBufferPointer<CChar>?<br> if let geometryFile:String = geometryFile<br> {<br> guard let _geomSource:UnsafeMutableBufferPointer<CChar> =<br> Shader.openTextFile(Shader.posixPath(geometryFile))<br> else<br> {<br> return nil<br> }<br><br> geomSource = _geomSource<br> }<br><br></div>could be rewritten as <br><br> let geomSource:UnsafeMutableBufferPointer<CChar>?<br> if let geometryFile:String = geometryFile<br> {<br> guard geomSource:UnsafeMutableBufferPointer<CChar> =<br> Shader.openTextFile(Shader.posixPath(geometryFile))<br> else<br> {<br> return nil<br> }<br> }<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Dec 21, 2017 at 1:00 PM, Stephen Celis 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:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word;line-break:after-white-space">Ah, sorry, I misread! For readability I think I'd still favor something like:<div><br><div> if let b = b {</div><div> dict[a] = b</div><div> }</div><div><br></div><div>And I think some the arguments made in #0024 may still apply here, though feel free to discuss!</div><div><br></div><div>Stephen<br><div><br><div><div><blockquote type="cite"><div><div class="h5"><div>On Dec 21, 2017, at 1:37 PM, Benoit Pereira da silva <<a href="mailto:bpds@me.com" target="_blank">bpds@me.com</a>> wrote:</div><br class="m_-1997168762520199439Apple-interchange-newline"></div></div><div><div><div class="h5"><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;float:none;display:inline!important">Stephen,</span><div 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"><br></div><div 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">You are right the proposal #0024 is very close.</div><div 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">But in fact the logic is inverted. </div><div 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"><br></div><div 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">When using «=? » the right item is optional.</div><div 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">a =? b assigns « b » to « a » only if « b » is defined.</div><div 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">So if an optional is defined =? will not erase its value.</div><div 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"><br></div><div 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">But my real questions was…</div><div 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">Do you have such operators that you really use very often?</div><div 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">Should we incorporate bunches of new operators / micro-syntactic sugar?</div><div 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">Is swift evolution the good place to discuss such question?</div><div 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"><br></div><div 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">I don’t want to pollute your mail boxes.</div><div 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"><br></div><div 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">Best regards,</div><div 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"><br></div><div 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">B</div></div></div><div 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"><div><div class="h5"><div><br><blockquote type="cite"><div>Le 21 déc. 2017 à 19:12, Stephen Celis <<a href="mailto:stephen.celis@gmail.com" target="_blank">stephen.celis@gmail.com</a>> a écrit :</div><br class="m_-1997168762520199439Apple-interchange-newline"><div><div style="word-wrap:break-word;line-break:after-white-space">Such an operator was proposed here: <a href="https://github.com/apple/swift-evolution/blob/60a8980a66a0a1341871ec323797c5547d0e0925/proposals/0024-optional-value-setter.md" target="_blank">https://github.com/<wbr>apple/swift-evolution/blob/<wbr>60a8980a66a0a1341871ec323797c5<wbr>547d0e0925/proposals/0024-<wbr>optional-value-setter.md</a><div><br></div><div>It was ultimately rejected: <a href="https://lists.swift.org/pipermail/swift-evolution-announce/2016-February/000043.html" target="_blank">https://lists.swift.<wbr>org/pipermail/swift-evolution-<wbr>announce/2016-February/000043.<wbr>html</a></div><div><br></div><div>Stephen<br><div><br><blockquote type="cite"><div>On Dec 21, 2017, at 11:44 AM, Benoit Pereira da silva via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:</div><br class="m_-1997168762520199439Apple-interchange-newline"><div><div style="word-wrap:break-word;line-break:after-white-space"><div>Dear all,</div><div><br></div><div>That’s not ambitious but i think worth be explored.</div><div><br></div><div>What do you think for example of this Infix operator?</div><div>« =? » allows to express optional assignments in a very concise way.</div><div><br></div><div><br></div><div><div style="margin:0px;font-stretch:normal;font-size:13.5px;line-height:normal;font-family:Menlo;color:rgb(125,126,126);background-color:rgb(0,58,93)">// The `=? operator allows simplify optional assignements :</div><div style="margin:0px;font-stretch:normal;font-size:13.5px;line-height:normal;font-family:Menlo;color:rgb(125,126,126);background-color:rgb(0,58,93)">// `a = b ?? a` can be written : `a =? b`</div><div style="margin:0px;font-stretch:normal;font-size:13.5px;line-height:normal;font-family:Menlo;color:rgb(189,178,160);background-color:rgb(0,58,93)"><span style="color:rgb(198,101,118)">infix</span><span class="m_-1997168762520199439Apple-converted-space"> </span><span style="color:rgb(198,101,118)">operator</span><span class="m_-1997168762520199439Apple-converted-space"> </span>=?: AssignmentPrecedence</div><div style="margin:0px;font-stretch:normal;line-height:normal;background-color:rgb(0,58,93);min-height:14px"><br></div><div style="margin:0px;font-stretch:normal;font-size:13.5px;line-height:normal;font-family:Menlo;color:rgb(189,178,160);background-color:rgb(0,58,93)"><span style="color:rgb(198,101,118)">public</span><span class="m_-1997168762520199439Apple-converted-space"> </span><span style="color:rgb(198,101,118)">func</span><span class="m_-1997168762520199439Apple-converted-space"> </span>=?<T> ( left:<span style="color:rgb(198,101,118)">inout</span><span class="m_-1997168762520199439Apple-converted-space"> </span><span style="color:rgb(63,167,173)">T</span>?, right:<span class="m_-1997168762520199439Apple-converted-space"> </span><span style="color:rgb(63,167,173)">T</span>? ){</div><div style="margin:0px;font-stretch:normal;font-size:13.5px;line-height:normal;font-family:Menlo;color:rgb(189,178,160);background-color:rgb(0,58,93)"> left = right ?? left</div><div style="margin:0px;font-stretch:normal;font-size:13.5px;line-height:normal;font-family:Menlo;color:rgb(189,178,160);background-color:rgb(0,58,93)">}</div><div style="margin:0px;font-stretch:normal;line-height:normal;background-color:rgb(0,58,93);min-height:14px"><br></div><div style="margin:0px;font-stretch:normal;font-size:13.5px;line-height:normal;font-family:Menlo;color:rgb(189,178,160);background-color:rgb(0,58,93)"><span style="color:rgb(198,101,118)">public</span><span class="m_-1997168762520199439Apple-converted-space"> </span><span style="color:rgb(198,101,118)">func</span><span class="m_-1997168762520199439Apple-converted-space"> </span>=?<T> ( left:<span style="color:rgb(198,101,118)">inout</span><span class="m_-1997168762520199439Apple-converted-space"> </span><span style="color:rgb(63,167,173)">T</span>, right:<span class="m_-1997168762520199439Apple-converted-space"> </span><span style="color:rgb(63,167,173)">T</span>? ){</div><div style="margin:0px;font-stretch:normal;font-size:13.5px;line-height:normal;font-family:Menlo;color:rgb(189,178,160);background-color:rgb(0,58,93)"> left = right ?? left</div><div style="margin:0px;font-stretch:normal;font-size:13.5px;line-height:normal;font-family:Menlo;color:rgb(189,178,160);background-color:rgb(0,58,93)">}</div></div><div><br></div><div><br></div><div>Do you have such operators that you really use very often?</div><div><br></div></div></div></blockquote></div></div></div></div></blockquote></div><br></div></div><div><div><div class="h5"><div style="font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-size:14px"><div><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div 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