Eric Niebler wrote:
The iterator_adaptor<> template has a base() function to access the underlying iterator. Well and good. However, iterator_adaptor<> doesn't have a public typedef for the iterator type returned from this function. Can it be added?
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. If iterator_adaptor had a nested typedef for its Base template parameter, this would be very straightforward.
Seems reasonable. Can you submit a patch? -- Dave Abrahams Boost Consulting http://www.boost-consulting.com