A new user may naively expect Boost.Bind to accept function templates just as it does ordinary functions. For example: std::map<Vertex,Vertex> vertex_map; boost::prim_minimum_spanning_tree( graph , boost::make_associative_property_map( vertex_map ) ); works just as well as std::map<Vertex,Vertex> vertex_map; boost::prim_minimum_spanning_tree( graph , boost::make_associative_property_map< std::map<Vertex,Vertex> >(vertex_map) ); However, when converting boost::make_associative_property_map to a function object, the following code: std::map<Vertex,Vertex> vertex_map; boost::bind( boost_make_associative_property_map , vertex_map ) map_maker; boost::prim_minimum_spanning_tree( graph , map_maker() ); will not compile. The correct code is: std::map<Vertex,Vertex> vertex_map; boost::bind( boost_make_associative_property_map< std::map<Vertex,Vertex> > , vertex_map ) map_maker; boost::prim_minimum_spanning_tree( graph , map_maker() ); It took me quite a while to realize a mistake I made like this. I'm sure others will commit the same sort of mistake as well. Would it be too much for the Boost.Bind documentation to provide a note of caution with regard to function templates? Cromwell D. Enage __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com