does boost have iterators for nested std::list, or similar ?

From: Craig Henderson (craigh_at_[hidden])
Date: 2001-02-26 04:36:16

I am looking for a solution to the problem of iterating through a list of a
list using STL iterator technique, and wonder if boost provides any such
functionality.

for example, I have definitions such as
class Element;
typedef ElementList_t std::list<Element const *>;
typedef GroupList_t std::list<ElementList const *>;

and given a GroupList I need to iterator all the elements in a manner along
the lines of

GroupList_t group;
ElementList_t::const_iterator iter;
for (iter = group.first_element(); iter!=group.last_element(); iter++)
{
    Element const *pElement = *iter;
    ...
}

Now, obviously the iterator is going to have to be intelligent enough to
iterate each ElementList in turn and move onto the next when appropriate.

Before I begin development of such an iterator I thought it worth asking the
question of my peers ;)

TIA
Craig Henderson (new to boost)