Re: iterator (adaptor) mysteries

David Abrahams <>
4 Oct 2006 09:12:30 -0400
"albrecht.fritzsche" <> writes:

In the quest for the simplest iterator adaptor possible I came
up with the idea of simply inheriting from the iterator I'd
like to adapt to, iw with code a la

That typically doesn't result in legal iterators, or we'd have done
it in Boost. The return types of operator++, operator--, operator+=,
operator -=, and maybe a few others are wrong. Also if the underlying
iterator happens to be a pointer, of course, you're out of luck.
Also, if the underlying iterator author has specialized
iterator_traits instead of using member types, you're out of luck.

Really, we did the research :). Iterators are a complicated world,
full of subtle issues, and this is hard to get right.

Dave Abrahams
Boost Consulting

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