<div dir="ltr"><div><br></div><div>> <span style="font-size:12.800000190734863px">If it mutates whatever the input is referencing, it would have a side-effect which makes it "not pure" (for my understanding of what “pure” means).</span></div><div><br></div>I am not really sure of it (I have not played around with it until now) but I don't think that this is an issue with the swift inout, cf. <a href="https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/doc/uid/TP40014097-CH34-ID545">https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/doc/uid/TP40014097-CH34-ID545</a><div><br></div><div>Nicolas</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Feb 16, 2017 at 8:55 PM, David Sweeris 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"><span class=""><br>
> On Feb 16, 2017, at 11:27 AM, Sean Heber via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br>
><br>
> Doesn’t this break down if you can pass a reference as a parameter to a pure function? If that’s not allowed, I guess I must have missed it. Also this seems to require the function has a return value. I suppose generally a pure function without a return value wouldn’t make much sense - unless you pass it a reference.<br>
<br>
</span>If it mutates whatever the input is referencing, it would have a side-effect which makes it "not pure" (for my understanding of what “pure” means).<br>
<br>
- Dave Sweeris<br>
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