dmd 2.063 beta 5

[TommiT]

On Friday, 24 May 2013 at 11:57:53 UTC, Don wrote:
> On Friday, 24 May 2013 at 10:55:09 UTC, Artur Skawina wrote:
>> Hence, you are arguing for a change in behavior. And the 
>> arguments for that
>> are extremely weak. The goal should be to allow const 
>> initialization to happen
>> exactly once.
>
> I agree. This is the crux of the argument.
> Are you and I the the only ones who see that as a valuable 
> property of the language? I'm astonished that others are so 
> willing to sacrifice it.

If const variable initialization is allowed to happen exactly 
once, then you'd prevent more complex initializations like the 
following:

struct Test
{
     immutable int[] lut;
     immutable int cnt;

     this(int mod)
     {
         lut.length = 999;
         cnt = 0;
         size_t last = 0;

         foreach (i, ref e; lut)
         {
             if (i % mod == 0)
             {
                 e = 42;
                 ++cnt;
                 last = i;
             }
         }
         lut.length = last + 1;
     }
}