74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
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// Copyright (c) 2006, Stephan Diederich
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//
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// This code may be used under either of the following two licences:
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE. OF SUCH DAMAGE.
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//
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// Or:
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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/*
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Writes maximal flow problem in extended DIMACS format to an OutputIterator
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Vertex indices are read from an IndexMap and shiftet by 1.
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so their new range is [1..num_vertices(g)]
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*/
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/* ----------------------------------------------------------------- */
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#include <vector>
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#include <string>
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#include <ostream>
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namespace boost
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{
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template < class Graph, class CapacityMap, class IndexMap >
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void write_dimacs_max_flow(const Graph& g, CapacityMap capacity, IndexMap idx,
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typename graph_traits< Graph >::vertex_descriptor src,
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typename graph_traits< Graph >::vertex_descriptor sink, std::ostream& out)
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{
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typedef typename graph_traits< Graph >::edge_iterator edge_iterator;
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out << "c DIMACS max-flow file generated from boost::write_dimacs_max_flow"
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<< std::endl;
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out << "p max " << num_vertices(g) << " " << num_edges(g)
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<< std::endl; // print problem description "max" and number of verts and
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// edges
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out << "n " << get(idx, src) + 1 << " s" << std::endl;
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; // say which one is source
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out << "n " << get(idx, sink) + 1 << " t"
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<< std::endl; // say which one is sink
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// output the edges
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edge_iterator ei, e_end;
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for (boost::tie(ei, e_end) = edges(g); ei != e_end; ++ei)
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{
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out << "a " << idx[source(*ei, g)] + 1 << " " << idx[target(*ei, g)] + 1
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<< " " << get(capacity, *ei) << std::endl;
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}
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}
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} // namespace boost
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