author | hgs |
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// |
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//======================================================================= |
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// Copyright 1997, 1998, 1999, 2000 University of Notre Dame. |
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// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// 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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// |
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#ifndef BOOST_GRAPH_TOPOLOGICAL_SORT_HPP |
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#define BOOST_GRAPH_TOPOLOGICAL_SORT_HPP |
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#include <boost/config.hpp> |
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#include <boost/property_map.hpp> |
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#include <boost/graph/depth_first_search.hpp> |
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#include <boost/graph/visitors.hpp> |
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#include <boost/graph/exception.hpp> |
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namespace boost { |
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// Topological sort visitor |
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// |
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// This visitor merely writes the linear ordering into an |
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// OutputIterator. The OutputIterator could be something like an |
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// ostream_iterator, or it could be a back/front_insert_iterator. |
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// Note that if it is a back_insert_iterator, the recorded order is |
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// the reverse topological order. On the other hand, if it is a |
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// front_insert_iterator, the recorded order is the topological |
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// order. |
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// |
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template <typename OutputIterator> |
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struct topo_sort_visitor : public dfs_visitor<> |
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{ |
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topo_sort_visitor(OutputIterator _iter) |
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: m_iter(_iter) { } |
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template <typename Edge, typename Graph> |
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void back_edge(const Edge& u, Graph&) { throw not_a_dag(); } |
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template <typename Vertex, typename Graph> |
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void finish_vertex(const Vertex& u, Graph&) { *m_iter++ = u; } |
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OutputIterator m_iter; |
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}; |
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// Topological Sort |
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// |
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// The topological sort algorithm creates a linear ordering |
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// of the vertices such that if edge (u,v) appears in the graph, |
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// then u comes before v in the ordering. The graph must |
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// be a directed acyclic graph (DAG). The implementation |
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// consists mainly of a call to depth-first search. |
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// |
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template <typename VertexListGraph, typename OutputIterator, |
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typename P, typename T, typename R> |
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void topological_sort(VertexListGraph& g, OutputIterator result, |
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const bgl_named_params<P, T, R>& params) |
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{ |
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typedef topo_sort_visitor<OutputIterator> TopoVisitor; |
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depth_first_search(g, params.visitor(TopoVisitor(result))); |
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} |
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template <typename VertexListGraph, typename OutputIterator> |
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void topological_sort(VertexListGraph& g, OutputIterator result) |
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{ |
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topological_sort(g, result, |
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bgl_named_params<int, buffer_param_t>(0)); // bogus |
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} |
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} // namespace boost |
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#endif /*BOOST_GRAPH_TOPOLOGICAL_SORT_H*/ |