| //======================================================================= |
| // Copyright 2002 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee, |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See |
| // accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| //======================================================================= |
| |
| #include <string> |
| #include <boost/graph/adjacency_list.hpp> |
| #include <boost/graph/undirected_dfs.hpp> |
| #include <boost/cstdlib.hpp> |
| #include <iostream> |
| |
| /* |
| Example graph from Tarjei Knapstad. |
| |
| H15 |
| | |
| H8 C2 |
| \ / \ |
| H9-C0-C1 C3-O7-H14 |
| / | | |
| H10 C6 C4 |
| / \ / \ |
| H11 C5 H13 |
| | |
| H12 |
| */ |
| |
| std::string name[] = { "C0", "C1", "C2", "C3", "C4", "C5", "C6", "O7", |
| "H8", "H9", "H10", "H11", "H12", "H13", "H14", "H15"}; |
| |
| |
| struct detect_loops : public boost::dfs_visitor<> |
| { |
| template <class Edge, class Graph> |
| void back_edge(Edge e, const Graph& g) { |
| std::cout << name[source(e, g)] |
| << " -- " |
| << name[target(e, g)] << "\n"; |
| } |
| }; |
| |
| int main(int, char*[]) |
| { |
| using namespace boost; |
| typedef adjacency_list< vecS, vecS, undirectedS, |
| no_property, |
| property<edge_color_t, default_color_type> > graph_t; |
| typedef graph_traits<graph_t>::vertex_descriptor vertex_t; |
| |
| const std::size_t N = sizeof(name)/sizeof(std::string); |
| graph_t g(N); |
| |
| add_edge(0, 1, g); |
| add_edge(0, 8, g); |
| add_edge(0, 9, g); |
| add_edge(0, 10, g); |
| add_edge(1, 2, g); |
| add_edge(1, 6, g); |
| add_edge(2, 15, g); |
| add_edge(2, 3, g); |
| add_edge(3, 7, g); |
| add_edge(3, 4, g); |
| add_edge(4, 13, g); |
| add_edge(4, 5, g); |
| add_edge(5, 12, g); |
| add_edge(5, 6, g); |
| add_edge(6, 11, g); |
| add_edge(7, 14, g); |
| |
| std::cout << "back edges:\n"; |
| detect_loops vis; |
| undirected_dfs(g, root_vertex(vertex_t(0)).visitor(vis) |
| .edge_color_map(get(edge_color, g))); |
| std::cout << std::endl; |
| |
| return boost::exit_success; |
| } |