Hello everybody! I'm using the property_map scheme to pass some data-structures to vistors of BGL-algorithms. So far I usually use a vector in the manner: std::vector<std::size_t> props(num_vertices(my_graph), 0) Then I do something like bfs_search(..., make_my_vistor(&props[0]), ...) which works ok and passes me a correct property_map into the visitor created by make_my_visitor. Within that visitor I can then do the usual stuff like put(the_props_map, vertex_id, someValue) At least that's how I understood, how the property_map concept works. However, if I use a bit-vector the above scheme breaks down to work: std::vector<bool> bit_props(num_vertices(my_graph), false) bfs_search(..., make_my_vistor(&bit_props[0]), ...) The compiler compiles these lines, but complains that a temprorary is passed as a reference to make_my_visitor and the code generated crashes. My system is a Ubununtu Edgy with boost 1.33.1 and g++ 4.1.2. Any ideas why this happens and what I can do here? Thanks a lot in advance. Greetings, Sebastian