Overloaded opApply for named template mixin

[Christian Hartung]

Em Wed, 12 Nov 2008 01:57:41 -0200, Simen Kjaeraas  
<simen.kjaras at gmail.com> escreveu:

> Right, I have this:
>
> template foo(T)
> {
>      int opApply(int delegate(ref T) dg)
>      {
>          // code here
>      }
> }
>
> class bar(T)
> {
>      mixin foo!(T) baz;
> }
>
> void main()
> {
>      bar b = new bar();
>      foreach(qux; bar.baz)
>      {
>      }
> }
>
> And it does not compile. The error I get is "expression has no value",  
> on the line with the foreach. Do I need to do this in a different way,  
> or is it simply not possible (at the moment)?
>

Currently the right way to do this is:

template foo(T)
{
     int opApply(int delegate(ref T) dg)
     {
         // code
     }
}

class bar(T)
{
     mixin foo!(T);
}

void main()
{
     auto b = new bar!(int);
     foreach(qux; b)
     {
     }
}

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