_indexed_ iteration using opApply or range -- PS

[Simen kjaeraas]

spir <denis.spir at gmail.com> wrote:

> PS: Also tried to make iteration work by defining slice "with no  
> argument" (coll[]) only, like indicated in TDPL p.381. But could not  
> manage to do it.

The point of coll[] is that a collection may not want to define the
range primitives itself, but rather expose a special range struct for
that purpose:

class Collection {
     auto opSlice( ) {
         struct range {
             // front, popFront, empty, whosYourDaddy
         }
         return range( this );
     }
}

-- 
Simen