Hi, I tried to do a depth_first_search with the following graph type and visitor: struct CycleDetector : public boost::default_dfs_visitor { CycleDetector( bool& cycle ) : m_hasCycle(cycle) {}; void back_edge( T_Edge, const T_Graph& ) { m_hasCycle = true; } bool& m_hasCycle; }; typedef boost::adjacency_list< boost::setS, boost::listS, boost::bidirectionalS> T_Graph; bool hasCycle(false); CycleDetector cd(hasCycle); boost::depth_first_search(m_graph, visitor(cd)); Compiling this on VC++ 7.1.3 (.NET Framework 1.1) results in the following error message: \boost\boost\property_map.hpp(349): error C2678: binary '+' : no operator found which takes a left-hand operand of type 'const std::vector<_Ty>::iterator' (or there is no acceptable conversion) with [ _Ty=boost::default_color_type ] ---------------------- Changing the graph type definition to: typedef boost::adjacency_list< boost::setS, boost::vecS, boost::bidirectionalS> T_Graph; (i.e. replacing the listS by vecS) works perfectly. Is this a known restriction of the library ? Best regards Alex ___________________________________________________________ Gesendet von Yahoo! Mail - Jetzt mit 1GB Speicher kostenlos - Hier anmelden: http://mail.yahoo.de