[Boost-users] Any "2D" iterator?

Subject: [Boost-users] Any "2D" iterator?
From: lfrfly_at_[hidden]
Date: 2010-09-17 11:15:47

I have on several occasions encountered situations in which it would be 
advantageous to view a container of containers as a flat sequence. It 
seems like there ought to be a natural way to do this using an iterator 
class. For instance, if you have
vector<list<T>> v, you ought to be able to design an iterator which 
begins at v.begin()->begin() and runs until v.end(), over every element 
of every list.

Does such a thing exist in Boost, or is it planned in the near future?