RFC on range design for D2

[Andrei Alexandrescu]

bearophile wrote:
> Andrei Alexandrescu:
>> In Phobos things will be something like:
> 
> List!(Filedesc) lst;
> for (auto r = lst.all; !r.isEmpty; ) {
>      if (should_remove)
>           r = lst.erase(take(1, r));
>      else
>           r.next;
> }
> 
> It may be better to invent and add some sugar to that, and foreach helps, maybe something like:
> 
> List!(Filedesc) lst;
> foreach (ref r; lst.all) {
>      if (predicate(lst.item(r)))
>           r = lst.erase(r);
>      else
>           r = r.next();
> }
> 
> I think that code of mine isn't good yet :-)

Wow, that's risky. foreach bumps r under the hood, so you'll skip some 
elements.

Andrei