On 2013-04-08 14:52, Iain Buclaw wrote:

On 8 April 2013 13:25, Jacob Carlborg <doob@me.com <mailto:doob@me.com>>

wrote:

    On 2013-04-08 10:29, Iain Buclaw wrote:

        This information could possibly be helpful.  Though given that
        most of
        (gdc) codegen is on par with g++, there's probably not much on
        the list
        that isn't already detected by the backend optimisation passes.


    Multiple calls to pure functions could be cached.

    --
    /Jacob Carlborg

Not always, but in some circumstances, yes.

---
struct Foo
{
   int a = 0;
   pure int bar (immutable int x)
   {
     ++a;
     return x * 2;
   }
}


void main()
{
   Foo f;
   int i = f.bar(2) + f.bar(2);

   assert (i == 8);
   assert (f.a == 2);
}

I though that wasn't possible. What's the point of pure if that's possible?