63e88f80
 Hu Chunming
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// Copyright (c) 2006, Stephan Diederich
//
// This code may be used under either of the following two licences:
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE. OF SUCH DAMAGE.
//
// Or:
//
// 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)
/*
Writes maximal flow problem in extended DIMACS format to an OutputIterator
Vertex indices are read from an IndexMap and shiftet by 1.
so their new range is [1..num_vertices(g)]
*/
/* ----------------------------------------------------------------- */
#include <vector>
#include <string>
#include <ostream>
namespace boost
{
template < class Graph, class CapacityMap, class IndexMap >
void write_dimacs_max_flow(const Graph& g, CapacityMap capacity, IndexMap idx,
typename graph_traits< Graph >::vertex_descriptor src,
typename graph_traits< Graph >::vertex_descriptor sink, std::ostream& out)
{
typedef typename graph_traits< Graph >::edge_iterator edge_iterator;
out << "c DIMACS max-flow file generated from boost::write_dimacs_max_flow"
<< std::endl;
out << "p max " << num_vertices(g) << " " << num_edges(g)
<< std::endl; // print problem description "max" and number of verts and
// edges
out << "n " << get(idx, src) + 1 << " s" << std::endl;
; // say which one is source
out << "n " << get(idx, sink) + 1 << " t"
<< std::endl; // say which one is sink
// output the edges
edge_iterator ei, e_end;
for (boost::tie(ei, e_end) = edges(g); ei != e_end; ++ei)
{
out << "a " << idx[source(*ei, g)] + 1 << " " << idx[target(*ei, g)] + 1
<< " " << get(capacity, *ei) << std::endl;
}
}
} // namespace boost
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