Why is this pure?
Alex Rønne Petersen via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Sun Aug 24 23:34:05 PDT 2014
On Monday, 25 August 2014 at 06:27:00 UTC, Shachar wrote:
> The following program compiles, and does what you'd expect:
>
> struct A {
> int a;
> }
>
> pure int func( ref A a )
> {
> return a.a += 3;
> }
>
> As far as I can tell, however, it shouldn't. I don't see how or
> why func can possibly be considered pure, as it changes a state
> external to the function.
>
> What am I missing? Or is this just a compiler bug?
>
> Shachar
http://klickverbot.at/blog/2012/05/purity-in-d/
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