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- //=======================================================================
- // 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;
- }
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