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// Copyright (c) Jeremy Siek 2001, Marc Wintermantel 2002
//
// 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_BANDWIDTH_HPP
#define BOOST_GRAPH_BANDWIDTH_HPP
#include <algorithm> // for std::min and std::max
#include <boost/config.hpp>
#include <boost/graph/graph_traits.hpp>
#include <boost/detail/numeric_traits.hpp>
namespace boost {
template <typename Graph, typename VertexIndexMap>
typename graph_traits<Graph>::vertices_size_type
ith_bandwidth(typename graph_traits<Graph>::vertex_descriptor i,
const Graph& g,
VertexIndexMap index)
{
BOOST_USING_STD_MAX();
using std::abs;
typedef typename graph_traits<Graph>::vertices_size_type vertices_size_type;
vertices_size_type b = 0;
typename graph_traits<Graph>::out_edge_iterator e, end;
for (boost::tie(e, end) = out_edges(i, g); e != end; ++e) {
int f_i = get(index, i);
int f_j = get(index, target(*e, g));
b = max BOOST_PREVENT_MACRO_SUBSTITUTION (b, vertices_size_type(abs(f_i - f_j)));
}
return b;
}
template <typename Graph>
typename graph_traits<Graph>::vertices_size_type
ith_bandwidth(typename graph_traits<Graph>::vertex_descriptor i,
const Graph& g)
{
return ith_bandwidth(i, g, get(vertex_index, g));
}
template <typename Graph, typename VertexIndexMap>
typename graph_traits<Graph>::vertices_size_type
bandwidth(const Graph& g, VertexIndexMap index)
{
BOOST_USING_STD_MAX();
using std::abs;
typedef typename graph_traits<Graph>::vertices_size_type vertices_size_type;
vertices_size_type b = 0;
typename graph_traits<Graph>::edge_iterator i, end;
for (boost::tie(i, end) = edges(g); i != end; ++i) {
int f_i = get(index, source(*i, g));
int f_j = get(index, target(*i, g));
b = max BOOST_PREVENT_MACRO_SUBSTITUTION (b, vertices_size_type(abs(f_i - f_j)));
}
return b;
}
template <typename Graph>
typename graph_traits<Graph>::vertices_size_type
bandwidth(const Graph& g)
{
return bandwidth(g, get(vertex_index, g));
}
template <typename Graph, typename VertexIndexMap>
typename graph_traits<Graph>::vertices_size_type
edgesum(const Graph& g, VertexIndexMap index_map)
{
typedef typename graph_traits<Graph>::vertices_size_type size_type;
typedef typename detail::numeric_traits<size_type>::difference_type diff_t;
size_type sum = 0;
typename graph_traits<Graph>::edge_iterator i, end;
for (boost::tie(i, end) = edges(g); i != end; ++i) {
diff_t f_u = get(index_map, source(*i, g));
diff_t f_v = get(index_map, target(*i, g));
using namespace std; // to call abs() unqualified
sum += abs(f_u - f_v);
}
return sum;
}
} // namespace boost
#endif // BOOST_GRAPH_BANDWIDTH_HPP