author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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permissions | -rw-r--r-- |
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//======================================================================= |
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// Copyright 2002 Indiana University. |
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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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#ifndef BOOST_GRAPH_DAG_SHORTEST_PATHS_HPP |
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#define BOOST_GRAPH_DAG_SHORTEST_PATHS_HPP |
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#include <boost/graph/topological_sort.hpp> |
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#include <boost/graph/dijkstra_shortest_paths.hpp> |
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// single-source shortest paths for a Directed Acyclic Graph (DAG) |
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namespace boost { |
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// Initalize distances and call depth first search |
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template <class VertexListGraph, class DijkstraVisitor, |
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class DistanceMap, class WeightMap, class ColorMap, |
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class PredecessorMap, |
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class Compare, class Combine, |
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class DistInf, class DistZero> |
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inline void |
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dag_shortest_paths |
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(const VertexListGraph& g, |
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typename graph_traits<VertexListGraph>::vertex_descriptor s, |
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DistanceMap distance, WeightMap weight, ColorMap color, |
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PredecessorMap pred, |
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DijkstraVisitor vis, Compare compare, Combine combine, |
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DistInf inf, DistZero zero) |
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{ |
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typedef typename graph_traits<VertexListGraph>::vertex_descriptor Vertex; |
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std::vector<Vertex> rev_topo_order; |
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rev_topo_order.reserve(num_vertices(g)); |
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// Call 'depth_first_visit', not 'topological_sort', because we don't |
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// want to traverse the entire graph, only vertices reachable from 's', |
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// and 'topological_sort' will traverse everything. The logic below |
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// is the same as for 'topological_sort', only we call 'depth_first_visit' |
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// and 'topological_sort' calls 'depth_first_search'. |
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topo_sort_visitor<std::back_insert_iterator<std::vector<Vertex> > > |
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topo_visitor(std::back_inserter(rev_topo_order)); |
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depth_first_visit(g, s, topo_visitor, color); |
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typename graph_traits<VertexListGraph>::vertex_iterator ui, ui_end; |
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for (tie(ui, ui_end) = vertices(g); ui != ui_end; ++ui) { |
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put(distance, *ui, inf); |
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put(pred, *ui, *ui); |
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} |
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put(distance, s, zero); |
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vis.discover_vertex(s, g); |
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typename std::vector<Vertex>::reverse_iterator i; |
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for (i = rev_topo_order.rbegin(); i != rev_topo_order.rend(); ++i) { |
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Vertex u = *i; |
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vis.examine_vertex(u, g); |
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typename graph_traits<VertexListGraph>::out_edge_iterator e, e_end; |
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for (tie(e, e_end) = out_edges(u, g); e != e_end; ++e) { |
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vis.discover_vertex(target(*e, g), g); |
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bool decreased = relax(*e, g, weight, pred, distance, |
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combine, compare); |
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if (decreased) |
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vis.edge_relaxed(*e, g); |
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else |
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vis.edge_not_relaxed(*e, g); |
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} |
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vis.finish_vertex(u, g); |
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} |
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} |
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namespace detail { |
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// Defaults are the same as Dijkstra's algorithm |
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// Handle Distance Compare, Combine, Inf and Zero defaults |
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template <class VertexListGraph, class DijkstraVisitor, |
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class DistanceMap, class WeightMap, class ColorMap, |
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class IndexMap, class Params> |
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inline void |
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dag_sp_dispatch2 |
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(const VertexListGraph& g, |
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typename graph_traits<VertexListGraph>::vertex_descriptor s, |
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DistanceMap distance, WeightMap weight, ColorMap color, IndexMap id, |
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DijkstraVisitor vis, const Params& params) |
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{ |
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typedef typename property_traits<DistanceMap>::value_type D; |
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dummy_property_map p_map; |
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dag_shortest_paths |
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(g, s, distance, weight, color, |
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choose_param(get_param(params, vertex_predecessor), p_map), |
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vis, |
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choose_param(get_param(params, distance_compare_t()), std::less<D>()), |
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choose_param(get_param(params, distance_combine_t()), closed_plus<D>()), |
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choose_param(get_param(params, distance_inf_t()), |
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(std::numeric_limits<D>::max)()), |
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choose_param(get_param(params, distance_zero_t()), |
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D())); |
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} |
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// Handle DistanceMap and ColorMap defaults |
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template <class VertexListGraph, class DijkstraVisitor, |
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class DistanceMap, class WeightMap, class ColorMap, |
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class IndexMap, class Params> |
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inline void |
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dag_sp_dispatch1 |
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(const VertexListGraph& g, |
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typename graph_traits<VertexListGraph>::vertex_descriptor s, |
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DistanceMap distance, WeightMap weight, ColorMap color, IndexMap id, |
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DijkstraVisitor vis, const Params& params) |
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{ |
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typedef typename property_traits<WeightMap>::value_type T; |
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typename std::vector<T>::size_type n; |
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n = is_default_param(distance) ? num_vertices(g) : 1; |
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std::vector<T> distance_map(n); |
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n = is_default_param(color) ? num_vertices(g) : 1; |
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std::vector<default_color_type> color_map(n); |
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|
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dag_sp_dispatch2 |
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(g, s, |
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choose_param(distance, |
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make_iterator_property_map(distance_map.begin(), id, |
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distance_map[0])), |
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weight, |
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choose_param(color, |
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make_iterator_property_map(color_map.begin(), id, |
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color_map[0])), |
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id, vis, params); |
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} |
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|
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} // namespace detail |
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134 |
|
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template <class VertexListGraph, class Param, class Tag, class Rest> |
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inline void |
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dag_shortest_paths |
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(const VertexListGraph& g, |
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typename graph_traits<VertexListGraph>::vertex_descriptor s, |
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const bgl_named_params<Param,Tag,Rest>& params) |
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{ |
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// assert that the graph is directed... |
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null_visitor null_vis; |
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detail::dag_sp_dispatch1 |
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(g, s, |
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get_param(params, vertex_distance), |
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choose_const_pmap(get_param(params, edge_weight), g, edge_weight), |
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get_param(params, vertex_color), |
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choose_const_pmap(get_param(params, vertex_index), g, vertex_index), |
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choose_param(get_param(params, graph_visitor), |
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make_dijkstra_visitor(null_vis)), |
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params); |
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} |
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} // namespace boost |
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|
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#endif // BOOST_GRAPH_DAG_SHORTEST_PATHS_HPP |