<div dir="ltr">-1. Agreed for all of Jordan's reasons.</div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><br><div>Riley</div></div></div></div>
<br><div class="gmail_quote">On 11 December 2015 at 14:55, Jordan Rose 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"><div>-1. Enforced singletons lead to code that can't be unit-tested. Local types are occasionally convenient and they can't be unit-tested either, but spending one extra line to name the thing isn't going to hurt. You also can't pick an initializer here (at least not in this version).</div><div><br></div><div>IMHO, this just adds "another kind of thing" just to make code shorter, and "shorter" is not the right goal for Swift.</div><div><br></div><div>Best,</div><div>Jordan</div><div><br></div><br><div><blockquote type="cite"><div><div class="h5"><div>On Dec 11, 2015, at 14:07, Marc Knaup via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:</div><br></div></div><div><div><div class="h5"><div dir="ltr">Hey guys,<div><br></div><div>I am working on a proposal which touches (and could even partially depend on) another interesting concept which I think would be a great addition for Swift.</div><div><br></div><div>Object declarations could be a way to declare a class or struct with exactly one instance. They are perfect for singletons, anonymous subclasses and to anonymously implement a protocol.</div><div><br></div><div>Here some examples how it could look like:</div><div><br></div><div><font face="monospace, monospace">// singleton</font></div><div><font face="monospace, monospace">object GlobalResource {</font></div><div><font face="monospace, monospace"> func doSomething() { … }</font></div><div><font face="monospace, monospace">}</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace">let resource = GlobalResource</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace">// could all be the same</font></div><div><font face="monospace, monospace">resource.doSomething()</font></div><div><font face="monospace, monospace">GlobalResource.doSomething()</font></div><div><font face="monospace, monospace">GlobalResource.Type.doSomething()</font></div><div><br></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace">// anonymous subclass</font></div><div><font face="monospace, monospace">class ViewController: UIViewController {</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace"> override func loadView() {</font></div><div><font face="monospace, monospace"> view = object: UIView {</font></div><div><font face="monospace, monospace"> // configure view</font></div><div><font face="monospace, monospace"> }</font></div><div><font face="monospace, monospace"> }</font></div><div><font face="monospace, monospace">}</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace">// anonymous protocol implementation</font></div><div><font face="monospace, monospace">protocol TapHandler {</font></div><div><font face="monospace, monospace"> func handleTap()</font></div><div><font face="monospace, monospace">}</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace">view.tapHandler = object: TapHandler {</font></div><div><font face="monospace, monospace"> func handleTap() {</font></div><div><font face="monospace, monospace"> // …</font></div><div><font face="monospace, monospace"> }</font></div><div><font face="monospace, monospace">}</font></div><div><font face="monospace, monospace"><br></font></div><div><br></div><div>Kotlin is an example for a a modern language which uses this concept:</div><div><a href="https://kotlinlang.org/docs/reference/object-declarations.html" target="_blank">https://kotlinlang.org/docs/reference/object-declarations.html</a><br></div><div><br></div><div><br></div><div>What do you think about such an addition?</div></div>
</div></div><img src="https://u2002410.ct.sendgrid.net/wf/open?upn=ZEz4qHYnXhPr3bBPu-2FxP4tN3HfWKL-2FtJpqkQ0gkOVSAWVUCgq6j2gIMHLwUtsMvkh6zS-2F42OEDmC-2FuP8IhnJLSUcx5onHlpzOIn-2Frg3W6-2FKCm-2BXK-2FwGfUgVX09VHJVmk0TZUSq1TJuaeeSv-2FaBPGDu-2B53-2Bqq59Y9-2B5QQfYQCKUU-2Ft-2FjzKmkw6Hagd6EvybiQEVi8zW1ZX8PM26dnKJqSktSHIVAl3j0WqiS-2BX-2BGJKow-3D" alt="" width="1" height="1" border="0" style="min-height:1px!important;width:1px!important;border-width:0!important;margin-top:0!important;margin-bottom:0!important;margin-right:0!important;margin-left:0!important;padding-top:0!important;padding-bottom:0!important;padding-right:0!important;padding-left:0!important">
_______________________________________________<span class=""><br>swift-evolution mailing list<br><a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a><br><a href="https://lists.swift.org/mailman/listinfo/swift-evolution" target="_blank">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br></span></div></blockquote></div><br>
<img src="https://u2002410.ct.sendgrid.net/wf/open?upn=sIRoRT5zo00ToqQvAg-2Bayulo6Lqyk-2F0O-2BuwWmVBacYRM9IAEoCVT8fj4z6r5TdTNCGUPUTc-2BwkxC1v5U4cBeLuLkGmPlIeDaF5GmAt-2B1vDLjhCzVVIkzzMWobL1pXqUyLBCD4bldPBcs8fktUBi-2FAI4ki4v619-2F5y3h6fOWfLePc7MVtCsPz7cYlWDvP-2Bgs7Pl3lgxvpZ5Km8acVRvaG5iReIx3u7zw4JMfduUhsHcA-3D" alt="" width="1" height="1" border="0" style="min-height:1px!important;width:1px!important;border-width:0!important;margin-top:0!important;margin-bottom:0!important;margin-right:0!important;margin-left:0!important;padding-top:0!important;padding-bottom:0!important;padding-right:0!important;padding-left:0!important">
</div>
<br>_______________________________________________<br>
swift-evolution mailing list<br>
<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a><br>
<a href="https://lists.swift.org/mailman/listinfo/swift-evolution" rel="noreferrer" target="_blank">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br>
<br></blockquote></div><br></div>