The magic behind foreach (was: Re: Descent 0.5.3 released)

[Christopher Wright]

Bill Baxter wrote:
> It's not?
> 
> foreach(i;  things) {
>       if (i==a) continue;
>       if (i==b) break;
>       if (i==d) return;
>       if (i==c) goto somewhere;
> }
> 
> Those are all fairly common things to do from inside the 'dg' call.
> The int is how the compiler distinguishes which case got you out of
> the dg.
> 
> --bb

You didn't read my post carefully.

The use case you would lose is:
int opApply (int delegate(something) dg)
{
    auto result = dg(stuff);
    if (result)
    {
       // This would be impossible if we took a void delegate.
       log ("iteration stopped early");
       return result;
    }
    return 0;
}