Boost C++ Libraries

libs/graph/example/csr-example.cpp

// Copyright 2005 The Trustees of Indiana University.

// Use, modification and distribution is subject to 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)

//  Authors: Douglas Gregor
//           Andrew Lumsdaine

#include <boost/graph/compressed_sparse_row_graph.hpp>
#include <string>
#include <boost/graph/iteration_macros.hpp>
#include <iostream>
#include <fstream>
#include <boost/graph/graphviz.hpp>

using namespace boost;

class WebPage
{
public:
    std::string url;
};

int main()
{
    typedef std::pair< int, int > E;
    const char* urls[6] = {
        "http://www.boost.org/libs/graph/doc/index.html",
        "http://www.boost.org/libs/graph/doc/table_of_contents.html",
        "http://www.boost.org/libs/graph/doc/adjacency_list.html",
        "http://www.boost.org/libs/graph/doc/history.html",
        "http://www.boost.org/libs/graph/doc/bundles.html",
        "http://www.boost.org/libs/graph/doc/using_adjacency_list.html",
    };

    E the_edges[] = { E(0, 1), E(0, 2), E(0, 3), E(1, 0), E(1, 3), E(1, 5),
        E(2, 0), E(2, 5), E(3, 1), E(3, 4), E(4, 1), E(5, 0), E(5, 2) };

    typedef compressed_sparse_row_graph< directedS, WebPage > WebGraph;
    WebGraph g(boost::edges_are_sorted, &the_edges[0],
        &the_edges[0] + sizeof(the_edges) / sizeof(E), 6);

    // Set the URLs of each vertex
    int index = 0;
    BGL_FORALL_VERTICES(v, g, WebGraph)
    g[v].url = urls[index++];

    // Output each of the links
    std::cout << "The web graph:" << std::endl;
    BGL_FORALL_EDGES(e, g, WebGraph)
    std::cout << "  " << g[source(e, g)].url << " -> " << g[target(e, g)].url
              << std::endl;

    // Output the graph in DOT format
    dynamic_properties dp;
    dp.property("label", get(&WebPage::url, g));
    std::ofstream out("web-graph.dot");
    write_graphviz_dp(out, g, dp, std::string(), get(vertex_index, g));
    return 0;
}