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//=======================================================================
// Copyright 2001 University of Notre Dame.
// Author: 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)
//=======================================================================
/*
Sample output:
filtered edge set: (A,B) (C,D) (D,B)
filtered out-edges:
A --> B
B -->
C --> D
D --> B
E -->
*/
#include <boost/config.hpp>
#include <iostream>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/filtered_graph.hpp>
#include <boost/graph/graph_utility.hpp>
template <typename EdgeWeightMap>
struct positive_edge_weight {
positive_edge_weight() { }
positive_edge_weight(EdgeWeightMap weight) : m_weight(weight) { }
template <typename Edge>
bool operator()(const Edge& e) const {
return 0 < boost::get(m_weight, e);
}
EdgeWeightMap m_weight;
};
int main()
{
using namespace boost;
typedef adjacency_list<vecS, vecS, directedS,
no_property, property<edge_weight_t, int> > Graph;
typedef property_map<Graph, edge_weight_t>::type EdgeWeightMap;
enum { A, B, C, D, E, N };
const char* name = "ABCDE";
Graph g(N);
add_edge(A, B, 2, g);
add_edge(A, C, 0, g);
add_edge(C, D, 1, g);
add_edge(C, E, 0, g);
add_edge(D, B, 3, g);
add_edge(E, C, 0, g);
positive_edge_weight<EdgeWeightMap> filter(get(edge_weight, g));
filtered_graph<Graph, positive_edge_weight<EdgeWeightMap> >
fg(g, filter);
std::cout << "filtered edge set: ";
print_edges(fg, name);
std::cout << "filtered out-edges:" << std::endl;
print_graph(fg, name);
return 0;
}
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