Hi, I'm (still) trying to use the strong components algorithm with a graph storing vertices as a list (listS). I've learned thanks to this mailing list that I had to explicitely declare and intialize a vertex_index map. The declaration of my graph type should therefore look like that: typedef adjacency_list<listS, listS, directedS,property<vertex_index_t,std::size_t> > Graph; and the component map should be declared this way: typedef graph_traits<Graph>::vertices_size_type v_size_t; //the range of ComponentMap vector_property_map< v_size_t, property_map<Graph, vertex_index_t>::type> componentMap(num_vertices(g), get(vertex_index,g) ); //g is an instance of Graph I would like to know if there is a way to combine this with the use of bundles. In practice, I used to have this declaration for my graph type: typedef adjacency_list<listS, listS, directedS,VertexBundle> Graph; with: struct VertexBundle{ int id; }; How should I merge these two types of declarations? Is there a way to define the required vertex_index as a bundle property and to use it to define my component map afterward? Thanks! Stephane PS: I apologize for the level of the questions, but I couldn't get a good understanding of all the property mechanisms out of the documentation.