Hi, I have some Questions concerning the Boost Graph Library graph template selector VertexList type. In the docs at http://www.boost.org/doc/libs/1_47_0/libs/graph/doc/using_adjacency_list.htm... I just found the two types documented. 1. How do i use the printed_graph (...) with a graph type that uses boost::listS instead of boost::vecS? I read that by using boost::vecS there is automatically an internal property for each Vertex created, which is the index of the vertex. I assume this is the reason why 'add_edge (1,2,g);' and 'print_graph (g,get(boost::vertex_index, g));' work for a graph g with a boost::vecS VertexList. However i cannot simply do 'add_edge (1,2,g);' or 'print_graph (g,get(boost::vertex_index, g));' vor a graph g with a VertexList type listS. How do i specify a vertex_index property for VertexList listS graph type, so that i can somehow use print_graph (g,something);? How are vertices internally identified when using listS? Are there any documentations about the function 'vertex()'? I think it is missing in Table 1: Summary of boost graph concepts in http://www.boost.org/doc/libs/1_47_0/libs/graph/doc/graph_concepts.html Look at the difference in using add_edge for the two different graph types and what happens if i try to insert an edge with one vertex not yet being part of the vertex set. Here is an example: //begin code #include <iostream> #include #include typedef boost::adjacency_list < boost::listS, boost::vecS, boost::bidirectionalS> link_graph_vertex_vec; typedef boost::adjacency_list < boost::listS, boost::listS, boost::bidirectionalS> link_graph_vertex_list; int main(int argc, char** argv) { link_graph_vertex_vec g1(3); std::cout << "Number of vertices in g1: " << num_vertices (g1) << std::endl; add_edge (0,1,g1); std::cout << "Number of vertices in g1: " << num_vertices (g1) << std::endl; add_edge (1,2,g1); std::cout << "Number of vertices in g1: " << num_vertices (g1) << std::endl; add_edge (2,10,g1); std::cout << "Number of vertices in g1: " << num_vertices (g1) << std::endl; print_graph (g1, get(boost::vertex_index, g1)); link_graph_vertex_list g2(3); std::cout << "Number of vertices in g2: " << num_vertices (g2) << std::endl; add_edge (vertex(0,g2), vertex(1,g2), g2);//add_edge (0,1,g2); std::cout << "Number of vertices in g2: " << num_vertices (g2) << std::endl; add_edge (vertex(1,g2), vertex(2,g2), g2);//add_edge (1,2,g2); std::cout << "Number of vertices in g2: " << num_vertices (g2) << std::endl; //add_edge (vertex(2,g2), vertex(3,g2), g2);//add_edge (2,3,g2); //vertex(3,g2) // what is the return type, why does the program exit? std::cout << "Number of vertices in g2: " << num_vertices (g2) << std::endl; return 0; } //end code I have to decide whether to use boost::listS or boost::vecS for the VertexList type. The 'interface' of the vecS type graph operations are much easier for me to understand and to use. But on the other hand the listS type has the faster remove and insert operations. best regards Christoph