To use the remove_edge() function I have to change my graph definition from typedef adjacency_list< vecS, vecS, ....> to adjacency_list< ListS, listS, ....> . now the add_edge (...) function gives me an error while compiling: 'boost::add_edge' : cannot convert parameter 1 from 'int' to 'void *' what does this mean ???? also using these typedefs: typedef graph_traits < TGraph >::vertex_descriptor Tvertex_descriptor; typedef graph_traits < TGraph >::edge_descriptor Tedge_descriptor; typedef graph_traits <TGraph>::vertex_iterator Tvertex_iter; typedef graph_traits <TGraph>::edge_iterator Tedge_iter; seems to be no good idea, because I get many compiler errors now? Any help is welcome. -- Psst! Geheimtipp: Online Games kostenlos spielen bei den GMX Free Games! http://games.entertainment.gmx.net/de/entertainment/games/free