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85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
// Author: Alex Lauser
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// Output (Note that 'finish_edge' is never printed):
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// The example graph:
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// 0 --> 1 2
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// 1 --> 2
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// 2 --> 0
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#include <boost/config.hpp>
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#include <iostream>
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#include <vector>
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#include <boost/graph/adjacency_list.hpp>
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#include <boost/graph/graph_utility.hpp>
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template < typename graph_t > struct TalkativeVisitor : boost::dfs_visitor<>
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{
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typedef typename boost::graph_traits< graph_t >::vertex_descriptor
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vertex_descriptor;
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typedef typename boost::graph_traits< graph_t >::edge_descriptor
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edge_descriptor;
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// // Commented out to avoid clutter of the output.
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// void discover_vertex(vertex_descriptor u, const graph_t&) { // check!
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// std::cout << "discover_vertex: " << u << std::endl;
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// }
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// void finish_vertex(vertex_descriptor u, const graph_t&) { // check!
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// std::cout << "finish_vertex: " << u << std::endl;
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// }
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// void initialize_vertex(vertex_descriptor u, const graph_t&) { // check!
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// std::cout << "initialize_vertex: " << u << std::endl;
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// }
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// void start_vertex(vertex_descriptor u, const graph_t&) { // check!
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// std::cout << "start_vertex: " << u << std::endl;
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// }
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// void examine_edge(edge_descriptor u, const graph_t&) { // check!
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// std::cout << "examine_edge: " << u << std::endl;
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// }
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// void tree_edge(edge_descriptor u, const graph_t&) { // check!
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// std::cout << "tree_edge: " << u << std::endl;
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// }
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// void back_edge(edge_descriptor u, const graph_t&) { // check!
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// std::cout << "back_edge: " << u << std::endl;
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// }
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// void forward_or_cross_edge(edge_descriptor u, const graph_t&) { // check!
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// std::cout << "forward_or_cross_edge: " << u << std::endl;
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// }
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void finish_edge(edge_descriptor u, const graph_t&)
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{ // uncalled!
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std::cout << "finish_edge: " << u << std::endl;
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}
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};
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template < typename t >
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std::ostream& operator<<(std::ostream& os, const std::pair< t, t >& x)
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{
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return os << "(" << x.first << ", " << x.second << ")";
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}
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int main(int, char*[])
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{
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using namespace boost;
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typedef adjacency_list< vecS, vecS, directedS > Graph;
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Graph G;
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typedef graph_traits<
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adjacency_list< vecS, vecS, directedS > >::vertex_descriptor Vertex;
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Vertex a = add_vertex(G);
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Vertex b = add_vertex(G);
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Vertex c = add_vertex(G);
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add_edge(a, b, G);
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add_edge(b, c, G);
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add_edge(c, a, G);
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add_edge(a, c, G);
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std::cout << "The example graph:" << std::endl;
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print_graph(G);
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std::vector< default_color_type > color(num_vertices(G));
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depth_first_search(G, visitor(TalkativeVisitor< Graph >()));
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return 0;
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}
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