[Boost-users] Help with [Boost.Iterator] conditional operator

I just recently started using boost and had a question about the ++operator for iterators. What I have is a class foo that has a container of class bar. class foo { private: multimap container; public: pair get_container( bool usable ); }; class bar { public: /* * Return true if bar is usable, false otherwise. */ bool isUsable(); }; I would like to overload the ++operator for multimap so that I can return all bar's that are usable, i.e. call the bar::isUsable() function before returning the pair of iterators. I did find this web page: http://www.zeta.org.au/~jon/STL/views/doc/views.html and was wondering if boost had anything like this already. Thanks. -- ~Robert Umland