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//=======================================================================
// Copyright 1997-2001 University of Notre Dame.
// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
//
// 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/strong_components.hpp>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/graphviz.hpp>
#include <boost/graph/graph_utility.hpp>
/*
Sample output:
A directed graph:
a --> b f h
b --> c a
c --> d b
d --> e
e --> d
f --> g
g --> f d
h --> i
i --> h j e c
j -->
Total number of components: 4
Vertex a is in component 3
Vertex b is in component 3
Vertex c is in component 3
Vertex d is in component 0
Vertex e is in component 0
Vertex f is in component 1
Vertex g is in component 1
Vertex h is in component 3
Vertex i is in component 3
Vertex j is in component 2
*/
int main(int, char*[])
{
using namespace boost;
const char* name = "abcdefghij";
adjacency_list<vecS, vecS, directedS> G;
dynamic_properties dp;
read_graphviz("scc.dot", G, dp);
std::cout << "A directed graph:" << std::endl;
print_graph(G, name);
std::cout << std::endl;
typedef graph_traits<adjacency_list<vecS, vecS, directedS> >::vertex_descriptor Vertex;
std::vector<int> component(num_vertices(G)), discover_time(num_vertices(G));
std::vector<default_color_type> color(num_vertices(G));
std::vector<Vertex> root(num_vertices(G));
int num = strong_components(G, make_iterator_property_map(component.begin(), get(vertex_index, G)),
root_map(make_iterator_property_map(root.begin(), get(vertex_index, G))).
color_map(make_iterator_property_map(color.begin(), get(vertex_index, G))).
discover_time_map(make_iterator_property_map(discover_time.begin(), get(vertex_index, G))));
std::cout << "Total number of components: " << num << std::endl;
std::vector<int>::size_type i;
for (i = 0; i != component.size(); ++i)
std::cout << "Vertex " << name[i]
<<" is in component " << component[i] << std::endl;
return 0;
}
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