Iterators for D

[Tom S]

Craig Black wrote:
> When writing custom C++ iterators, I find that end() is not ever necessary.
> If end() is not used, it means that a little more smarts have to be added to
> the iterator itself so that the iterator knows when to stop.  In some cases
> this means that the iterator needs a pointer to the collection/container
> object in order to get that information.

Also in some cases, 'end()' is really unnatural to write. E.g. with 
cyclic containers.