To help LDC/GDC

[Artur Skawina]

On 04/09/13 02:44, deadalnix wrote:
> On Monday, 8 April 2013 at 15:07:31 UTC, Jacob Carlborg wrote:
>> I though that wasn't possible. What's the point of pure if that's possible?
> 
> You have to think that this is an hidden parameter. The function touch that parameter, no global state.

D's pure is horribly misnamed; nobody that's not already aware of the
D re-definition expects "pure" to mean what it currently does.

   struct S {
      int* p;
      int f() pure @safe nothrow { return ++*p; }
   }

   int i = 1;

   int main() {
      auto s = S(&i);
      assert(i==1);
      auto r = s.f();
      assert(r==2);
      r = s.f();
      assert(r==3);
      assert(i==3);
      return r;
   }

That's not pure by any definition, and fixing it w/o impacting
valid cases would be non-trivial (think array members).

artur