######################################################################### typename graph_traits<Graph>::edge_descriptor ed; bool exist; typename graph_traits<Graph>::edge_iterator ei, ei_end; Graph copyGraph; typename boost::property_map<Graph, edge_weight_t>::type weight = get(edge_weight, graph); typename boost::property_map<Graph, edge_index_t>::type edge_id = get(edge_index, graph); typename boost::property_map<Graph, edge_weight_t>::type weightc = get(edge_weight, copyGraph); typename boost::property_map<Graph, edge_index_t>::type edge_idc = get(edge_index, copyGraph); for ( tie(ei, ei_end)=edges(graph); ei != ei_end; ei++ ) { tie(ed, exist)= add_edge( source(*ei,graph), target(*ei,graph), copyGraph); put(edge_idc, ed, edge_id[*ei]); put(weightc, ed, weight[*ei]); } ############################################################################## hello everyone, i have a problem with this code that is used inside a fonction wich a call in a loop after 2 or 3 calls i have a segfault at the line with add_edge i'm using multigraphs Ps : i got the same probleme whiel using copy_graph(graph,copyGraph) is there any suggestions..... thanx