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//=======================================================================
// Copyright 2009 Trustees of Indiana University
// Author: Jeremiah Willcock
//
// 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)
//=======================================================================
#ifndef BOOST_GRAPH_LOOKUP_EDGE_HPP
#define BOOST_GRAPH_LOOKUP_EDGE_HPP
#include <utility>
#include <boost/config.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/graph/graph_traits.hpp>
// lookup_edge: a function that acts like edge() but falls back to out_edges()
// and a search when edge() is not provided.
namespace boost
{
template < typename Graph >
std::pair< typename boost::graph_traits< Graph >::edge_descriptor, bool >
lookup_edge(typename boost::graph_traits< Graph >::vertex_descriptor src,
typename boost::graph_traits< Graph >::vertex_descriptor tgt,
const Graph& g,
typename boost::enable_if< is_adjacency_matrix< Graph >, int >::type = 0)
{
return edge(src, tgt, g);
}
template < typename Graph >
std::pair< typename boost::graph_traits< Graph >::edge_descriptor, bool >
lookup_edge(typename boost::graph_traits< Graph >::vertex_descriptor src,
typename boost::graph_traits< Graph >::vertex_descriptor tgt,
const Graph& g,
typename boost::disable_if< is_adjacency_matrix< Graph >, int >::type = 0)
{
typedef typename boost::graph_traits< Graph >::out_edge_iterator it;
typedef typename boost::graph_traits< Graph >::edge_descriptor edesc;
std::pair< it, it > oe = out_edges(src, g);
for (; oe.first != oe.second; ++oe.first)
{
edesc e = *oe.first;
if (target(e, g) == tgt)
return std::make_pair(e, true);
}
return std::make_pair(edesc(), false);
}
}
#endif // BOOST_GRAPH_LOOKUP_EDGE_HPP