connected-components.cpp
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//=======================================================================
// Copyright 2001 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 <boost/config.hpp>
#include <iostream>
#include <vector>
#include <boost/graph/connected_components.hpp>
#include <boost/graph/adjacency_list.hpp>
int main()
{
using namespace boost;
typedef adjacency_list< vecS, vecS, undirectedS > Graph;
const int N = 6;
Graph G(N);
add_edge(0, 1, G);
add_edge(1, 4, G);
add_edge(4, 0, G);
add_edge(2, 5, G);
std::vector< int > c(num_vertices(G));
int num = connected_components(
G, make_iterator_property_map(c.begin(), get(vertex_index, G), c[0]));
std::cout << std::endl;
std::vector< int >::iterator i;
std::cout << "Total number of components: " << num << std::endl;
for (i = c.begin(); i != c.end(); ++i)
std::cout << "Vertex " << i - c.begin() << " is in component " << *i
<< std::endl;
std::cout << std::endl;
return EXIT_SUCCESS;
}