Thomas Witt wrote:
David Abrahams wrote:
Eric Niebler wrote:
Rationale: Given some iterator of type T that is built of an unknown number of adaptors, extract the underlying iterator. Consider:
template<class Iter> typename disable_if<is_adapted<Iter>,Iter>::type base(Iter const & it) { return it; }
template<class D,class B,class V,class T,class R,class Di> ?????????? base(iterator_adaptor<D,B,V,T,R,Di> const & it) { return base(it.base()); }
I can't think of a way to write the return type of the second overload.
I am not fully awake yet, but isn't that just B ?
Thomas
Good morning, Thomas! :-) If I were just returning it.base() then it would be B. Since I'm returning base(it.base()), it could be B or it could be some other type if B is itself an adapted iterator. I don't know how I've managed to get this far in life without knowing how to create a patch file. :-P I'll figure it out and submit one. -- Eric Niebler Boost Consulting www.boost-consulting.com