Boost C++ Libraries

libs/graph/example/make_connected.cpp

//=======================================================================
// Copyright 2007 Aaron Windsor
//
// 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 <iostream>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/properties.hpp>
#include <boost/graph/graph_traits.hpp>
#include <boost/property_map/property_map.hpp>
#include <vector>

#include <boost/graph/connected_components.hpp>
#include <boost/graph/make_connected.hpp>

using namespace boost;

int main(int argc, char** argv)
{

    typedef adjacency_list< vecS, vecS, undirectedS,
        property< vertex_index_t, int > >
        graph;

    graph g(11);
    add_edge(0, 1, g);
    add_edge(2, 3, g);
    add_edge(3, 4, g);
    add_edge(5, 6, g);
    add_edge(6, 7, g);
    add_edge(8, 9, g);
    add_edge(9, 10, g);
    add_edge(10, 8, g);

    std::vector< graph_traits< graph >::vertices_size_type > component(
        num_vertices(g));

    std::cout << "Before calling make_connected, the graph has "
              << connected_components(g, &component[0])
              << " connected components" << std::endl;

    make_connected(g);

    std::cout << "After calling make_connected, the graph has "
              << connected_components(g, &component[0])
              << " connected components" << std::endl;

    return 0;
}