int numberOfConnectedComponents(Graph *G) { typedef std::map<graph_traits<MyGraphType>::vertex_descriptor, graph_traits<MyGraphType>::vertices_size_type> component_type; component_type component; boost::associative_property_map< component_type > component_map(component); int num_components = connected_components(*G, component_map); return num_components; }
void make_biconnected_planar(Graph& g, PlanarEmbedding embedding, EdgeIndexMap em, AddEdgeVisitor& vis ) { typedef typename graph_traits<Graph>::vertex_descriptor vertex_t; typedef typename graph_traits<Graph>::edge_descriptor edge_t; typedef typename graph_traits<Graph>::edges_size_type edge_size_t; typedef typename property_traits<PlanarEmbedding>::value_type embedding_value_t; typedef typename embedding_value_t::const_iterator embedding_iterator_t; typedef iterator_property_map <std::vector<std::size_t>::iterator, EdgeIndexMap> component_map_t; edge_size_t n_edges(num_edges(g)); std::vector<vertex_t> articulation_points; std::vector<edge_size_t> component_vector(n_edges); component_map_t component_map(component_vector.begin(), em); biconnected_components(g, component_map, std::back_inserter(articulation_points)); typename std::vector<vertex_t>::iterator ap, ap_end; ap_end = articulation_points.end(); for(ap = articulation_points.begin(); ap != ap_end; ++ap) { vertex_t v(*ap); embedding_iterator_t pi = embedding[v].begin(); embedding_iterator_t pi_end = embedding[v].end(); edge_size_t previous_component(n_edges + 1); vertex_t previous_vertex = graph_traits<Graph>::null_vertex(); for(; pi != pi_end; ++pi) { edge_t e(*pi); vertex_t e_source(source(e,g)); vertex_t e_target(target(e,g)); //Skip self-loops and parallel edges if (e_source == e_target || previous_vertex == e_target) continue; vertex_t current_vertex = e_source == v ? e_target : e_source; edge_size_t current_component = component_map[e]; if (previous_vertex != graph_traits<Graph>::null_vertex() && current_component != previous_component) { vis.visit_vertex_pair(current_vertex, previous_vertex, g); } previous_vertex = current_vertex; previous_component = current_component; } } }