Writing an iterator that makes several containers look as one

Question

Consider the following simplified example and desired output:

class A
{
    class combined_iterator
    {
        ????
    }
    typedef ??? t_combined_it;

         


        

Answer 1

The answers other people gave only work for joining two ranges, but not an arbitrary number of range.

PStade Oven has a concatenated adaptor for joining any number of ranges; it also has a jointed adaptor for joining 2 ranges, specifically.

You can of course turn the ranges into iterators with begin() and end() if necessary; just make sure the ranges outlast the iterators.