[906] | 1 | /* -*- C++ -*- |
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[921] | 2 | * src/lemon/dijkstra.h - Part of LEMON, a generic C++ optimization library |
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[906] | 3 | * |
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[1164] | 4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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[906] | 5 | * (Egervary Combinatorial Optimization Research Group, EGRES). |
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| 6 | * |
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| 7 | * Permission to use, modify and distribute this software is granted |
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| 8 | * provided that this copyright notice appears in all copies. For |
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| 9 | * precise terms see the accompanying LICENSE file. |
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| 10 | * |
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| 11 | * This software is provided "AS IS" with no warranty of any kind, |
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| 12 | * express or implied, and with no claim as to its suitability for any |
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| 13 | * purpose. |
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| 14 | * |
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| 15 | */ |
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| 16 | |
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[921] | 17 | #ifndef LEMON_DIJKSTRA_H |
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| 18 | #define LEMON_DIJKSTRA_H |
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[255] | 19 | |
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[758] | 20 | ///\ingroup flowalgs |
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[255] | 21 | ///\file |
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| 22 | ///\brief Dijkstra algorithm. |
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| 23 | |
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[953] | 24 | #include <lemon/list_graph.h> |
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[921] | 25 | #include <lemon/bin_heap.h> |
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| 26 | #include <lemon/invalid.h> |
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[1119] | 27 | #include <lemon/error.h> |
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| 28 | #include <lemon/maps.h> |
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[255] | 29 | |
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[921] | 30 | namespace lemon { |
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[385] | 31 | |
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[1119] | 32 | |
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[1151] | 33 | |
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[954] | 34 | ///Default traits class of Dijkstra class. |
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| 35 | |
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| 36 | ///Default traits class of Dijkstra class. |
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| 37 | ///\param GR Graph type. |
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| 38 | ///\param LM Type of length map. |
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[953] | 39 | template<class GR, class LM> |
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| 40 | struct DijkstraDefaultTraits |
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| 41 | { |
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[954] | 42 | ///The graph type the algorithm runs on. |
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[953] | 43 | typedef GR Graph; |
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| 44 | ///The type of the map that stores the edge lengths. |
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| 45 | |
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[1124] | 46 | ///The type of the map that stores the edge lengths. |
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[967] | 47 | ///It must meet the \ref concept::ReadMap "ReadMap" concept. |
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[953] | 48 | typedef LM LengthMap; |
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[954] | 49 | //The type of the length of the edges. |
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[987] | 50 | typedef typename LM::Value Value; |
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[954] | 51 | ///The heap type used by Dijkstra algorithm. |
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[967] | 52 | |
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| 53 | ///The heap type used by Dijkstra algorithm. |
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| 54 | /// |
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| 55 | ///\sa BinHeap |
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| 56 | ///\sa Dijkstra |
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[953] | 57 | typedef BinHeap<typename Graph::Node, |
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[987] | 58 | typename LM::Value, |
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[953] | 59 | typename GR::template NodeMap<int>, |
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[987] | 60 | std::less<Value> > Heap; |
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[953] | 61 | |
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| 62 | ///\brief The type of the map that stores the last |
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| 63 | ///edges of the shortest paths. |
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| 64 | /// |
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[1124] | 65 | ///The type of the map that stores the last |
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| 66 | ///edges of the shortest paths. |
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[967] | 67 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
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[953] | 68 | /// |
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[954] | 69 | typedef typename Graph::template NodeMap<typename GR::Edge> PredMap; |
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| 70 | ///Instantiates a PredMap. |
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[953] | 71 | |
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[1123] | 72 | ///This function instantiates a \ref PredMap. |
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| 73 | ///\param G is the graph, to which we would like to define the PredMap. |
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[1119] | 74 | ///\todo The graph alone may be insufficient for the initialization |
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[954] | 75 | static PredMap *createPredMap(const GR &G) |
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[953] | 76 | { |
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| 77 | return new PredMap(G); |
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| 78 | } |
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[1218] | 79 | // ///\brief The type of the map that stores the last but one |
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| 80 | // ///nodes of the shortest paths. |
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| 81 | // /// |
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| 82 | // ///The type of the map that stores the last but one |
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| 83 | // ///nodes of the shortest paths. |
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| 84 | // ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
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| 85 | // /// |
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| 86 | // typedef NullMap<typename Graph::Node,typename Graph::Node> PredNodeMap; |
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| 87 | // ///Instantiates a PredNodeMap. |
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[1125] | 88 | |
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[1218] | 89 | // ///This function instantiates a \ref PredNodeMap. |
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| 90 | // ///\param G is the graph, to which |
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| 91 | // ///we would like to define the \ref PredNodeMap |
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| 92 | // static PredNodeMap *createPredNodeMap(const GR &G) |
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| 93 | // { |
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| 94 | // return new PredNodeMap(); |
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| 95 | // } |
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[1119] | 96 | |
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[1218] | 97 | ///The type of the map that stores whether a nodes is processed. |
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[1119] | 98 | |
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[1218] | 99 | ///The type of the map that stores whether a nodes is processed. |
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[1119] | 100 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
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| 101 | ///By default it is a NullMap. |
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[1218] | 102 | ///\todo If it is set to a real map, |
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| 103 | ///Dijkstra::processed() should read this. |
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[1119] | 104 | ///\todo named parameter to set this type, function to read and write. |
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[1218] | 105 | typedef NullMap<typename Graph::Node,bool> ProcessedMap; |
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| 106 | ///Instantiates a ProcessedMap. |
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[1119] | 107 | |
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[1218] | 108 | ///This function instantiates a \ref ProcessedMap. |
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[1156] | 109 | ///\param G is the graph, to which |
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[1218] | 110 | ///we would like to define the \ref ProcessedMap |
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| 111 | static ProcessedMap *createProcessedMap(const GR &G) |
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[1119] | 112 | { |
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[1218] | 113 | return new ProcessedMap(); |
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[1119] | 114 | } |
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[953] | 115 | ///The type of the map that stores the dists of the nodes. |
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| 116 | |
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[1124] | 117 | ///The type of the map that stores the dists of the nodes. |
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[967] | 118 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
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[953] | 119 | /// |
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[987] | 120 | typedef typename Graph::template NodeMap<typename LM::Value> DistMap; |
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[954] | 121 | ///Instantiates a DistMap. |
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[953] | 122 | |
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[1123] | 123 | ///This function instantiates a \ref DistMap. |
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| 124 | ///\param G is the graph, to which we would like to define the \ref DistMap |
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[954] | 125 | static DistMap *createDistMap(const GR &G) |
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[953] | 126 | { |
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| 127 | return new DistMap(G); |
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| 128 | } |
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| 129 | }; |
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| 130 | |
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[255] | 131 | ///%Dijkstra algorithm class. |
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[1125] | 132 | |
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[1151] | 133 | /// \ingroup flowalgs |
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[255] | 134 | ///This class provides an efficient implementation of %Dijkstra algorithm. |
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| 135 | ///The edge lengths are passed to the algorithm using a |
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[959] | 136 | ///\ref concept::ReadMap "ReadMap", |
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[255] | 137 | ///so it is easy to change it to any kind of length. |
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| 138 | /// |
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[880] | 139 | ///The type of the length is determined by the |
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[987] | 140 | ///\ref concept::ReadMap::Value "Value" of the length map. |
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[255] | 141 | /// |
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| 142 | ///It is also possible to change the underlying priority heap. |
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| 143 | /// |
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[1218] | 144 | ///\param GR The graph type the algorithm runs on. The default value |
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| 145 | ///is \ref ListGraph. The value of GR is not used directly by |
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| 146 | ///Dijkstra, it is only passed to \ref DijkstraDefaultTraits. |
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| 147 | ///\param LM This read-only EdgeMap determines the lengths of the |
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| 148 | ///edges. It is read once for each edge, so the map may involve in |
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| 149 | ///relatively time consuming process to compute the edge length if |
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| 150 | ///it is necessary. The default map type is \ref |
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| 151 | ///concept::StaticGraph::EdgeMap "Graph::EdgeMap<int>". The value |
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| 152 | ///of LM is not used directly by Dijkstra, it is only passed to \ref |
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| 153 | ///DijkstraDefaultTraits. \param TR Traits class to set |
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| 154 | ///various data types used by the algorithm. The default traits |
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| 155 | ///class is \ref DijkstraDefaultTraits |
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| 156 | ///"DijkstraDefaultTraits<GR,LM>". See \ref |
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| 157 | ///DijkstraDefaultTraits for the documentation of a Dijkstra traits |
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| 158 | ///class. |
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[456] | 159 | /// |
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[689] | 160 | ///\author Jacint Szabo and Alpar Juttner |
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[1128] | 161 | ///\todo A compare object would be nice. |
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[584] | 162 | |
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[255] | 163 | #ifdef DOXYGEN |
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[584] | 164 | template <typename GR, |
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| 165 | typename LM, |
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[953] | 166 | typename TR> |
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[255] | 167 | #else |
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[953] | 168 | template <typename GR=ListGraph, |
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[584] | 169 | typename LM=typename GR::template EdgeMap<int>, |
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[953] | 170 | typename TR=DijkstraDefaultTraits<GR,LM> > |
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[255] | 171 | #endif |
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[1116] | 172 | class Dijkstra { |
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[255] | 173 | public: |
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[1125] | 174 | /** |
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| 175 | * \brief \ref Exception for uninitialized parameters. |
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| 176 | * |
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| 177 | * This error represents problems in the initialization |
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| 178 | * of the parameters of the algorithms. |
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| 179 | */ |
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| 180 | class UninitializedParameter : public lemon::UninitializedParameter { |
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| 181 | public: |
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| 182 | virtual const char* exceptionName() const { |
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[1218] | 183 | return "lemon::Dijkstra::UninitializedParameter"; |
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[1125] | 184 | } |
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| 185 | }; |
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[1119] | 186 | |
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[953] | 187 | typedef TR Traits; |
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[584] | 188 | ///The type of the underlying graph. |
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[954] | 189 | typedef typename TR::Graph Graph; |
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[911] | 190 | ///\e |
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[255] | 191 | typedef typename Graph::Node Node; |
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[911] | 192 | ///\e |
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[255] | 193 | typedef typename Graph::NodeIt NodeIt; |
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[911] | 194 | ///\e |
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[255] | 195 | typedef typename Graph::Edge Edge; |
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[911] | 196 | ///\e |
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[255] | 197 | typedef typename Graph::OutEdgeIt OutEdgeIt; |
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| 198 | |
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[584] | 199 | ///The type of the length of the edges. |
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[987] | 200 | typedef typename TR::LengthMap::Value Value; |
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[693] | 201 | ///The type of the map that stores the edge lengths. |
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[954] | 202 | typedef typename TR::LengthMap LengthMap; |
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[693] | 203 | ///\brief The type of the map that stores the last |
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[584] | 204 | ///edges of the shortest paths. |
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[953] | 205 | typedef typename TR::PredMap PredMap; |
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[1218] | 206 | // ///\brief The type of the map that stores the last but one |
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| 207 | // ///nodes of the shortest paths. |
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| 208 | // typedef typename TR::PredNodeMap PredNodeMap; |
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| 209 | ///The type of the map indicating if a node is processed. |
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| 210 | typedef typename TR::ProcessedMap ProcessedMap; |
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[693] | 211 | ///The type of the map that stores the dists of the nodes. |
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[953] | 212 | typedef typename TR::DistMap DistMap; |
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| 213 | ///The heap type used by the dijkstra algorithm. |
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| 214 | typedef typename TR::Heap Heap; |
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[255] | 215 | private: |
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[802] | 216 | /// Pointer to the underlying graph. |
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[688] | 217 | const Graph *G; |
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[802] | 218 | /// Pointer to the length map |
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[954] | 219 | const LengthMap *length; |
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[802] | 220 | ///Pointer to the map of predecessors edges. |
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[1119] | 221 | PredMap *_pred; |
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| 222 | ///Indicates if \ref _pred is locally allocated (\c true) or not. |
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| 223 | bool local_pred; |
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[1218] | 224 | // ///Pointer to the map of predecessors nodes. |
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| 225 | // PredNodeMap *_predNode; |
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| 226 | // ///Indicates if \ref _predNode is locally allocated (\c true) or not. |
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| 227 | // bool local_predNode; |
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[802] | 228 | ///Pointer to the map of distances. |
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[1130] | 229 | DistMap *_dist; |
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| 230 | ///Indicates if \ref _dist is locally allocated (\c true) or not. |
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| 231 | bool local_dist; |
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[1218] | 232 | ///Pointer to the map of processed status of the nodes. |
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| 233 | ProcessedMap *_processed; |
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| 234 | ///Indicates if \ref _processed is locally allocated (\c true) or not. |
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| 235 | bool local_processed; |
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[688] | 236 | |
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[1218] | 237 | // ///The source node of the last execution. |
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| 238 | // Node source; |
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[774] | 239 | |
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[1128] | 240 | ///Creates the maps if necessary. |
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[688] | 241 | |
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[694] | 242 | ///\todo Error if \c G or are \c NULL. What about \c length? |
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[688] | 243 | ///\todo Better memory allocation (instead of new). |
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[1128] | 244 | void create_maps() |
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[688] | 245 | { |
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[1119] | 246 | if(!_pred) { |
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| 247 | local_pred = true; |
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| 248 | _pred = Traits::createPredMap(*G); |
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[688] | 249 | } |
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[1218] | 250 | // if(!_predNode) { |
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| 251 | // local_predNode = true; |
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| 252 | // _predNode = Traits::createPredNodeMap(*G); |
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| 253 | // } |
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[1130] | 254 | if(!_dist) { |
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| 255 | local_dist = true; |
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| 256 | _dist = Traits::createDistMap(*G); |
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[688] | 257 | } |
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[1218] | 258 | if(!_processed) { |
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| 259 | local_processed = true; |
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| 260 | _processed = Traits::createProcessedMap(*G); |
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[1119] | 261 | } |
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[688] | 262 | } |
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[255] | 263 | |
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| 264 | public : |
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[1116] | 265 | |
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[1128] | 266 | ///\name Named template parameters |
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| 267 | |
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| 268 | ///@{ |
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| 269 | |
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[953] | 270 | template <class T> |
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[1116] | 271 | struct DefPredMapTraits : public Traits { |
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[953] | 272 | typedef T PredMap; |
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| 273 | static PredMap *createPredMap(const Graph &G) |
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| 274 | { |
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[1126] | 275 | throw UninitializedParameter(); |
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[953] | 276 | } |
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| 277 | }; |
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[954] | 278 | ///\ref named-templ-param "Named parameter" for setting PredMap type |
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| 279 | |
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| 280 | ///\ref named-templ-param "Named parameter" for setting PredMap type |
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[1043] | 281 | /// |
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[953] | 282 | template <class T> |
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[1116] | 283 | class DefPredMap : public Dijkstra< Graph, |
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[953] | 284 | LengthMap, |
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[1116] | 285 | DefPredMapTraits<T> > { }; |
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[953] | 286 | |
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[1218] | 287 | // template <class T> |
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| 288 | // struct DefPredNodeMapTraits : public Traits { |
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| 289 | // typedef T PredNodeMap; |
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| 290 | // static PredNodeMap *createPredNodeMap(const Graph &G) |
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| 291 | // { |
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| 292 | // throw UninitializedParameter(); |
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| 293 | // } |
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| 294 | // }; |
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| 295 | // ///\ref named-templ-param "Named parameter" for setting PredNodeMap type |
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[954] | 296 | |
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[1218] | 297 | // ///\ref named-templ-param "Named parameter" for setting PredNodeMap type |
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| 298 | // /// |
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| 299 | // template <class T> |
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| 300 | // class DefPredNodeMap : public Dijkstra< Graph, |
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| 301 | // LengthMap, |
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| 302 | // DefPredNodeMapTraits<T> > { }; |
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[953] | 303 | |
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| 304 | template <class T> |
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[1116] | 305 | struct DefDistMapTraits : public Traits { |
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[953] | 306 | typedef T DistMap; |
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| 307 | static DistMap *createDistMap(const Graph &G) |
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| 308 | { |
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[1126] | 309 | throw UninitializedParameter(); |
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[953] | 310 | } |
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| 311 | }; |
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[954] | 312 | ///\ref named-templ-param "Named parameter" for setting DistMap type |
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| 313 | |
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| 314 | ///\ref named-templ-param "Named parameter" for setting DistMap type |
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[1043] | 315 | /// |
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[953] | 316 | template <class T> |
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[1116] | 317 | class DefDistMap : public Dijkstra< Graph, |
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[953] | 318 | LengthMap, |
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[1116] | 319 | DefDistMapTraits<T> > { }; |
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[953] | 320 | |
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[1128] | 321 | template <class T> |
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[1218] | 322 | struct DefProcessedMapTraits : public Traits { |
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| 323 | typedef T ProcessedMap; |
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| 324 | static ProcessedMap *createProcessedMap(const Graph &G) |
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[1128] | 325 | { |
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| 326 | throw UninitializedParameter(); |
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| 327 | } |
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| 328 | }; |
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[1218] | 329 | ///\ref named-templ-param "Named parameter" for setting ProcessedMap type |
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[1128] | 330 | |
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[1218] | 331 | ///\ref named-templ-param "Named parameter" for setting ProcessedMap type |
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[1128] | 332 | /// |
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| 333 | template <class T> |
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[1218] | 334 | class DefProcessedMap : public Dijkstra< Graph, |
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[1128] | 335 | LengthMap, |
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[1218] | 336 | DefProcessedMapTraits<T> > { }; |
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[1128] | 337 | |
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[1218] | 338 | struct DefGraphProcessedMapTraits : public Traits { |
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| 339 | typedef typename Graph::template NodeMap<bool> ProcessedMap; |
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| 340 | static ProcessedMap *createProcessedMap(const Graph &G) |
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[1128] | 341 | { |
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[1218] | 342 | return new ProcessedMap(G); |
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[1128] | 343 | } |
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| 344 | }; |
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| 345 | ///\brief \ref named-templ-param "Named parameter" |
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[1218] | 346 | ///for setting the ProcessedMap type to be Graph::NodeMap<bool>. |
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[1128] | 347 | /// |
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| 348 | ///\ref named-templ-param "Named parameter" |
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[1218] | 349 | ///for setting the ProcessedMap type to be Graph::NodeMap<bool>. |
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[1128] | 350 | ///If you don't set it explicitely, it will be automatically allocated. |
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| 351 | template <class T> |
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[1218] | 352 | class DefProcessedMapToBeDefaultMap : |
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[1128] | 353 | public Dijkstra< Graph, |
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| 354 | LengthMap, |
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[1218] | 355 | DefGraphProcessedMapTraits> { }; |
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[1128] | 356 | |
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| 357 | ///@} |
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| 358 | |
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| 359 | |
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| 360 | private: |
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| 361 | typename Graph::template NodeMap<int> _heap_map; |
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| 362 | Heap _heap; |
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| 363 | public: |
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| 364 | |
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[802] | 365 | ///Constructor. |
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[255] | 366 | |
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[802] | 367 | ///\param _G the graph the algorithm will run on. |
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| 368 | ///\param _length the length map used by the algorithm. |
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[954] | 369 | Dijkstra(const Graph& _G, const LengthMap& _length) : |
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[688] | 370 | G(&_G), length(&_length), |
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[1119] | 371 | _pred(NULL), local_pred(false), |
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[1218] | 372 | // _predNode(NULL), local_predNode(false), |
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[1130] | 373 | _dist(NULL), local_dist(false), |
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[1218] | 374 | _processed(NULL), local_processed(false), |
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[1128] | 375 | _heap_map(*G,-1),_heap(_heap_map) |
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[688] | 376 | { } |
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| 377 | |
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[802] | 378 | ///Destructor. |
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[688] | 379 | ~Dijkstra() |
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| 380 | { |
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[1119] | 381 | if(local_pred) delete _pred; |
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[1218] | 382 | // if(local_predNode) delete _predNode; |
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[1130] | 383 | if(local_dist) delete _dist; |
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[1218] | 384 | if(local_processed) delete _processed; |
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[688] | 385 | } |
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| 386 | |
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| 387 | ///Sets the length map. |
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| 388 | |
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| 389 | ///Sets the length map. |
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| 390 | ///\return <tt> (*this) </tt> |
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[1116] | 391 | Dijkstra &lengthMap(const LengthMap &m) |
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[688] | 392 | { |
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| 393 | length = &m; |
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| 394 | return *this; |
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| 395 | } |
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| 396 | |
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| 397 | ///Sets the map storing the predecessor edges. |
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| 398 | |
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| 399 | ///Sets the map storing the predecessor edges. |
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| 400 | ///If you don't use this function before calling \ref run(), |
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| 401 | ///it will allocate one. The destuctor deallocates this |
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| 402 | ///automatically allocated map, of course. |
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| 403 | ///\return <tt> (*this) </tt> |
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[1116] | 404 | Dijkstra &predMap(PredMap &m) |
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[688] | 405 | { |
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[1119] | 406 | if(local_pred) { |
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| 407 | delete _pred; |
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| 408 | local_pred=false; |
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[688] | 409 | } |
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[1119] | 410 | _pred = &m; |
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[688] | 411 | return *this; |
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| 412 | } |
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| 413 | |
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[1218] | 414 | // ///Sets the map storing the predecessor nodes. |
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[688] | 415 | |
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[1218] | 416 | // ///Sets the map storing the predecessor nodes. |
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| 417 | // ///If you don't use this function before calling \ref run(), |
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| 418 | // ///it will allocate one. The destuctor deallocates this |
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| 419 | // ///automatically allocated map, of course. |
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| 420 | // ///\return <tt> (*this) </tt> |
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| 421 | // Dijkstra &predNodeMap(PredNodeMap &m) |
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| 422 | // { |
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| 423 | // if(local_predNode) { |
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| 424 | // delete _predNode; |
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| 425 | // local_predNode=false; |
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| 426 | // } |
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| 427 | // _predNode = &m; |
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| 428 | // return *this; |
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| 429 | // } |
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[688] | 430 | |
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| 431 | ///Sets the map storing the distances calculated by the algorithm. |
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| 432 | |
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| 433 | ///Sets the map storing the distances calculated by the algorithm. |
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| 434 | ///If you don't use this function before calling \ref run(), |
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| 435 | ///it will allocate one. The destuctor deallocates this |
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| 436 | ///automatically allocated map, of course. |
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| 437 | ///\return <tt> (*this) </tt> |
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[1116] | 438 | Dijkstra &distMap(DistMap &m) |
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[688] | 439 | { |
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[1130] | 440 | if(local_dist) { |
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| 441 | delete _dist; |
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| 442 | local_dist=false; |
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[688] | 443 | } |
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[1130] | 444 | _dist = &m; |
---|
[688] | 445 | return *this; |
---|
| 446 | } |
---|
[694] | 447 | |
---|
[1130] | 448 | private: |
---|
| 449 | void finalizeNodeData(Node v,Value dst) |
---|
| 450 | { |
---|
[1218] | 451 | _processed->set(v,true); |
---|
[1130] | 452 | _dist->set(v, dst); |
---|
[1218] | 453 | // if((*_pred)[v]!=INVALID) |
---|
| 454 | // _predNode->set(v,G->source((*_pred)[v])); ///\todo What to do? |
---|
[1130] | 455 | } |
---|
| 456 | |
---|
| 457 | public: |
---|
[1218] | 458 | ///\name Execution control |
---|
[1128] | 459 | ///The simplest way to execute the algorithm is to use |
---|
[1156] | 460 | ///one of the member functions called \c run(...). |
---|
[1128] | 461 | ///\n |
---|
[1218] | 462 | ///If you need more control on the execution, |
---|
[1128] | 463 | ///first you must call \ref init(), then you can add several source nodes |
---|
[1218] | 464 | ///with \ref addSource(). |
---|
| 465 | ///Finally \ref start() will perform the actual path |
---|
[1128] | 466 | ///computation. |
---|
| 467 | |
---|
| 468 | ///@{ |
---|
| 469 | |
---|
| 470 | ///Initializes the internal data structures. |
---|
| 471 | |
---|
| 472 | ///Initializes the internal data structures. |
---|
| 473 | /// |
---|
| 474 | ///\todo _heap_map's type could also be in the traits class. |
---|
| 475 | void init() |
---|
| 476 | { |
---|
| 477 | create_maps(); |
---|
[774] | 478 | |
---|
| 479 | for ( NodeIt u(*G) ; u!=INVALID ; ++u ) { |
---|
[1119] | 480 | _pred->set(u,INVALID); |
---|
[1218] | 481 | // _predNode->set(u,INVALID); |
---|
| 482 | _processed->set(u,false); |
---|
[1128] | 483 | _heap_map.set(u,Heap::PRE_HEAP); |
---|
[694] | 484 | } |
---|
[1128] | 485 | } |
---|
| 486 | |
---|
| 487 | ///Adds a new source node. |
---|
| 488 | |
---|
[1155] | 489 | ///Adds a new source node to the priority heap. |
---|
[1128] | 490 | /// |
---|
| 491 | ///The optional second parameter is the initial distance of the node. |
---|
| 492 | /// |
---|
[1155] | 493 | ///It checks if the node has already been added to the heap and |
---|
| 494 | ///It is pushed to the heap only if either it was not in the heap |
---|
| 495 | ///or the shortest path found till then is longer then \c dst. |
---|
[1128] | 496 | void addSource(Node s,Value dst=0) |
---|
| 497 | { |
---|
[1218] | 498 | // source = s; |
---|
[1128] | 499 | if(_heap.state(s) != Heap::IN_HEAP) _heap.push(s,dst); |
---|
[1155] | 500 | else if(_heap[s]<dst) { |
---|
| 501 | _heap.push(s,dst); |
---|
| 502 | _pred->set(s,INVALID); |
---|
| 503 | } |
---|
[1128] | 504 | } |
---|
| 505 | |
---|
[1155] | 506 | ///Processes the next node in the priority heap |
---|
| 507 | |
---|
| 508 | ///Processes the next node in the priority heap. |
---|
| 509 | /// |
---|
| 510 | ///\warning The priority heap must not be empty! |
---|
[1151] | 511 | void processNextNode() |
---|
[1128] | 512 | { |
---|
| 513 | Node v=_heap.top(); |
---|
| 514 | Value oldvalue=_heap[v]; |
---|
| 515 | _heap.pop(); |
---|
[1130] | 516 | finalizeNodeData(v,oldvalue); |
---|
[694] | 517 | |
---|
[1128] | 518 | for(OutEdgeIt e(*G,v); e!=INVALID; ++e) { |
---|
| 519 | Node w=G->target(e); |
---|
| 520 | switch(_heap.state(w)) { |
---|
| 521 | case Heap::PRE_HEAP: |
---|
| 522 | _heap.push(w,oldvalue+(*length)[e]); |
---|
| 523 | _pred->set(w,e); |
---|
[1130] | 524 | // _predNode->set(w,v); |
---|
[1128] | 525 | break; |
---|
| 526 | case Heap::IN_HEAP: |
---|
| 527 | if ( oldvalue+(*length)[e] < _heap[w] ) { |
---|
| 528 | _heap.decrease(w, oldvalue+(*length)[e]); |
---|
[1119] | 529 | _pred->set(w,e); |
---|
[1130] | 530 | // _predNode->set(w,v); |
---|
[694] | 531 | } |
---|
[1128] | 532 | break; |
---|
| 533 | case Heap::POST_HEAP: |
---|
| 534 | break; |
---|
[694] | 535 | } |
---|
| 536 | } |
---|
| 537 | } |
---|
[1128] | 538 | |
---|
[1218] | 539 | ///\brief Returns \c false if there are nodes |
---|
| 540 | ///to be processed in the priority heap |
---|
[1155] | 541 | /// |
---|
[1218] | 542 | ///Returns \c false if there are nodes |
---|
| 543 | ///to be processed in the priority heap |
---|
| 544 | bool emptyQueue() { return _heap.empty(); } |
---|
[1155] | 545 | ///Returns the number of the nodes to be processed in the priority heap |
---|
| 546 | |
---|
| 547 | ///Returns the number of the nodes to be processed in the priority heap |
---|
| 548 | /// |
---|
[1218] | 549 | int queueSize() { return _heap.size(); } |
---|
[1155] | 550 | |
---|
[1130] | 551 | ///Executes the algorithm. |
---|
[1128] | 552 | |
---|
[1130] | 553 | ///Executes the algorithm. |
---|
[1128] | 554 | /// |
---|
[1130] | 555 | ///\pre init() must be called and at least one node should be added |
---|
| 556 | ///with addSource() before using this function. |
---|
[1128] | 557 | /// |
---|
| 558 | ///This method runs the %Dijkstra algorithm from the root node(s) |
---|
| 559 | ///in order to |
---|
| 560 | ///compute the |
---|
| 561 | ///shortest path to each node. The algorithm computes |
---|
| 562 | ///- The shortest path tree. |
---|
| 563 | ///- The distance of each node from the root(s). |
---|
| 564 | /// |
---|
| 565 | void start() |
---|
| 566 | { |
---|
[1151] | 567 | while ( !_heap.empty() ) processNextNode(); |
---|
[1128] | 568 | } |
---|
[255] | 569 | |
---|
[1130] | 570 | ///Executes the algorithm until \c dest is reached. |
---|
[1128] | 571 | |
---|
[1130] | 572 | ///Executes the algorithm until \c dest is reached. |
---|
[1128] | 573 | /// |
---|
[1130] | 574 | ///\pre init() must be called and at least one node should be added |
---|
| 575 | ///with addSource() before using this function. |
---|
[1128] | 576 | /// |
---|
| 577 | ///This method runs the %Dijkstra algorithm from the root node(s) |
---|
| 578 | ///in order to |
---|
| 579 | ///compute the |
---|
| 580 | ///shortest path to \c dest. The algorithm computes |
---|
| 581 | ///- The shortest path to \c dest. |
---|
| 582 | ///- The distance of \c dest from the root(s). |
---|
| 583 | /// |
---|
| 584 | void start(Node dest) |
---|
| 585 | { |
---|
[1151] | 586 | while ( !_heap.empty() && _heap.top()!=dest ) processNextNode(); |
---|
[1130] | 587 | if ( _heap.top()==dest ) finalizeNodeData(_heap.top()); |
---|
| 588 | } |
---|
| 589 | |
---|
| 590 | ///Executes the algorithm until a condition is met. |
---|
| 591 | |
---|
| 592 | ///Executes the algorithm until a condition is met. |
---|
| 593 | /// |
---|
| 594 | ///\pre init() must be called and at least one node should be added |
---|
| 595 | ///with addSource() before using this function. |
---|
| 596 | /// |
---|
| 597 | ///\param nm must be a bool (or convertible) node map. The algorithm |
---|
| 598 | ///will stop when it reaches a node \c v with <tt>nm[v]==true</tt>. |
---|
| 599 | template<class NM> |
---|
| 600 | void start(const NM &nm) |
---|
| 601 | { |
---|
[1193] | 602 | while ( !_heap.empty() && !nm[_heap.top()] ) processNextNode(); |
---|
[1130] | 603 | if ( !_heap.empty() ) finalizeNodeData(_heap.top()); |
---|
[1128] | 604 | } |
---|
| 605 | |
---|
| 606 | ///Runs %Dijkstra algorithm from node \c s. |
---|
| 607 | |
---|
| 608 | ///This method runs the %Dijkstra algorithm from a root node \c s |
---|
| 609 | ///in order to |
---|
| 610 | ///compute the |
---|
| 611 | ///shortest path to each node. The algorithm computes |
---|
| 612 | ///- The shortest path tree. |
---|
| 613 | ///- The distance of each node from the root. |
---|
| 614 | /// |
---|
| 615 | ///\note d.run(s) is just a shortcut of the following code. |
---|
| 616 | ///\code |
---|
| 617 | /// d.init(); |
---|
| 618 | /// d.addSource(s); |
---|
| 619 | /// d.start(); |
---|
| 620 | ///\endcode |
---|
| 621 | void run(Node s) { |
---|
| 622 | init(); |
---|
| 623 | addSource(s); |
---|
| 624 | start(); |
---|
| 625 | } |
---|
| 626 | |
---|
[1130] | 627 | ///Finds the shortest path between \c s and \c t. |
---|
| 628 | |
---|
| 629 | ///Finds the shortest path between \c s and \c t. |
---|
| 630 | /// |
---|
| 631 | ///\return The length of the shortest s---t path if there exists one, |
---|
| 632 | ///0 otherwise. |
---|
| 633 | ///\note Apart from the return value, d.run(s) is |
---|
| 634 | ///just a shortcut of the following code. |
---|
| 635 | ///\code |
---|
| 636 | /// d.init(); |
---|
| 637 | /// d.addSource(s); |
---|
| 638 | /// d.start(t); |
---|
| 639 | ///\endcode |
---|
| 640 | Value run(Node s,Node t) { |
---|
| 641 | init(); |
---|
| 642 | addSource(s); |
---|
| 643 | start(t); |
---|
| 644 | return (*_pred)[t]==INVALID?0:(*_dist)[t]; |
---|
| 645 | } |
---|
| 646 | |
---|
[1128] | 647 | ///@} |
---|
| 648 | |
---|
| 649 | ///\name Query Functions |
---|
| 650 | ///The result of the %Dijkstra algorithm can be obtained using these |
---|
| 651 | ///functions.\n |
---|
| 652 | ///Before the use of these functions, |
---|
| 653 | ///either run() or start() must be called. |
---|
| 654 | |
---|
| 655 | ///@{ |
---|
| 656 | |
---|
[385] | 657 | ///The distance of a node from the root. |
---|
[255] | 658 | |
---|
[385] | 659 | ///Returns the distance of a node from the root. |
---|
[255] | 660 | ///\pre \ref run() must be called before using this function. |
---|
[385] | 661 | ///\warning If node \c v in unreachable from the root the return value |
---|
[255] | 662 | ///of this funcion is undefined. |
---|
[1130] | 663 | Value dist(Node v) const { return (*_dist)[v]; } |
---|
[373] | 664 | |
---|
[584] | 665 | ///Returns the 'previous edge' of the shortest path tree. |
---|
[255] | 666 | |
---|
[584] | 667 | ///For a node \c v it returns the 'previous edge' of the shortest path tree, |
---|
[785] | 668 | ///i.e. it returns the last edge of a shortest path from the root to \c |
---|
[688] | 669 | ///v. It is \ref INVALID |
---|
| 670 | ///if \c v is unreachable from the root or if \c v=s. The |
---|
[385] | 671 | ///shortest path tree used here is equal to the shortest path tree used in |
---|
| 672 | ///\ref predNode(Node v). \pre \ref run() must be called before using |
---|
| 673 | ///this function. |
---|
[780] | 674 | ///\todo predEdge could be a better name. |
---|
[1119] | 675 | Edge pred(Node v) const { return (*_pred)[v]; } |
---|
[373] | 676 | |
---|
[584] | 677 | ///Returns the 'previous node' of the shortest path tree. |
---|
[255] | 678 | |
---|
[584] | 679 | ///For a node \c v it returns the 'previous node' of the shortest path tree, |
---|
[385] | 680 | ///i.e. it returns the last but one node from a shortest path from the |
---|
| 681 | ///root to \c /v. It is INVALID if \c v is unreachable from the root or if |
---|
| 682 | ///\c v=s. The shortest path tree used here is equal to the shortest path |
---|
| 683 | ///tree used in \ref pred(Node v). \pre \ref run() must be called before |
---|
| 684 | ///using this function. |
---|
[1130] | 685 | Node predNode(Node v) const { return (*_pred)[v]==INVALID ? INVALID: |
---|
| 686 | G->source((*_pred)[v]); } |
---|
[255] | 687 | |
---|
| 688 | ///Returns a reference to the NodeMap of distances. |
---|
| 689 | |
---|
[385] | 690 | ///Returns a reference to the NodeMap of distances. \pre \ref run() must |
---|
| 691 | ///be called before using this function. |
---|
[1130] | 692 | const DistMap &distMap() const { return *_dist;} |
---|
[385] | 693 | |
---|
[255] | 694 | ///Returns a reference to the shortest path tree map. |
---|
| 695 | |
---|
| 696 | ///Returns a reference to the NodeMap of the edges of the |
---|
| 697 | ///shortest path tree. |
---|
| 698 | ///\pre \ref run() must be called before using this function. |
---|
[1119] | 699 | const PredMap &predMap() const { return *_pred;} |
---|
[385] | 700 | |
---|
[1218] | 701 | // ///Returns a reference to the map of nodes of shortest paths. |
---|
[255] | 702 | |
---|
[1218] | 703 | // ///Returns a reference to the NodeMap of the last but one nodes of the |
---|
| 704 | // ///shortest path tree. |
---|
| 705 | // ///\pre \ref run() must be called before using this function. |
---|
| 706 | // const PredNodeMap &predNodeMap() const { return *_predNode;} |
---|
[255] | 707 | |
---|
[385] | 708 | ///Checks if a node is reachable from the root. |
---|
[255] | 709 | |
---|
[385] | 710 | ///Returns \c true if \c v is reachable from the root. |
---|
[1218] | 711 | ///\warning The source nodes are inditated as unreached. |
---|
[255] | 712 | ///\pre \ref run() must be called before using this function. |
---|
[385] | 713 | /// |
---|
[1218] | 714 | bool reached(Node v) { return _heap_map[v]!=Heap::PRE_HEAP; } |
---|
[255] | 715 | |
---|
[1128] | 716 | ///@} |
---|
[255] | 717 | }; |
---|
[953] | 718 | |
---|
[1218] | 719 | |
---|
| 720 | |
---|
| 721 | |
---|
| 722 | |
---|
| 723 | ///Default traits class of Dijkstra function. |
---|
| 724 | |
---|
| 725 | ///Default traits class of Dijkstra function. |
---|
| 726 | ///\param GR Graph type. |
---|
| 727 | ///\param LM Type of length map. |
---|
| 728 | template<class GR, class LM> |
---|
| 729 | struct DijkstraWizardDefaultTraits |
---|
| 730 | { |
---|
| 731 | ///The graph type the algorithm runs on. |
---|
| 732 | typedef GR Graph; |
---|
| 733 | ///The type of the map that stores the edge lengths. |
---|
| 734 | |
---|
| 735 | ///The type of the map that stores the edge lengths. |
---|
| 736 | ///It must meet the \ref concept::ReadMap "ReadMap" concept. |
---|
| 737 | typedef LM LengthMap; |
---|
| 738 | //The type of the length of the edges. |
---|
| 739 | typedef typename LM::Value Value; |
---|
| 740 | ///The heap type used by Dijkstra algorithm. |
---|
| 741 | |
---|
| 742 | ///The heap type used by Dijkstra algorithm. |
---|
| 743 | /// |
---|
| 744 | ///\sa BinHeap |
---|
| 745 | ///\sa Dijkstra |
---|
| 746 | typedef BinHeap<typename Graph::Node, |
---|
| 747 | typename LM::Value, |
---|
| 748 | typename GR::template NodeMap<int>, |
---|
| 749 | std::less<Value> > Heap; |
---|
| 750 | |
---|
| 751 | ///\brief The type of the map that stores the last |
---|
| 752 | ///edges of the shortest paths. |
---|
| 753 | /// |
---|
| 754 | ///The type of the map that stores the last |
---|
| 755 | ///edges of the shortest paths. |
---|
| 756 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
---|
| 757 | /// |
---|
| 758 | typedef NullMap <typename GR::Node,typename GR::Edge> PredMap; |
---|
| 759 | ///Instantiates a PredMap. |
---|
| 760 | |
---|
| 761 | ///This function instantiates a \ref PredMap. |
---|
| 762 | ///\param G is the graph, to which we would like to define the PredMap. |
---|
| 763 | ///\todo The graph alone may be insufficient for the initialization |
---|
| 764 | static PredMap *createPredMap(const GR &G) |
---|
| 765 | { |
---|
| 766 | return new PredMap(); |
---|
| 767 | } |
---|
| 768 | ///The type of the map that stores whether a nodes is processed. |
---|
| 769 | |
---|
| 770 | ///The type of the map that stores whether a nodes is processed. |
---|
| 771 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
---|
| 772 | ///By default it is a NullMap. |
---|
| 773 | ///\todo If it is set to a real map, |
---|
| 774 | ///Dijkstra::processed() should read this. |
---|
| 775 | ///\todo named parameter to set this type, function to read and write. |
---|
| 776 | typedef NullMap<typename Graph::Node,bool> ProcessedMap; |
---|
| 777 | ///Instantiates a ProcessedMap. |
---|
| 778 | |
---|
| 779 | ///This function instantiates a \ref ProcessedMap. |
---|
| 780 | ///\param G is the graph, to which |
---|
| 781 | ///we would like to define the \ref ProcessedMap |
---|
| 782 | static ProcessedMap *createProcessedMap(const GR &G) |
---|
| 783 | { |
---|
| 784 | return new ProcessedMap(); |
---|
| 785 | } |
---|
| 786 | ///The type of the map that stores the dists of the nodes. |
---|
| 787 | |
---|
| 788 | ///The type of the map that stores the dists of the nodes. |
---|
| 789 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
---|
| 790 | /// |
---|
| 791 | typedef NullMap<typename Graph::Node,typename LM::Value> DistMap; |
---|
| 792 | ///Instantiates a DistMap. |
---|
| 793 | |
---|
| 794 | ///This function instantiates a \ref DistMap. |
---|
| 795 | ///\param G is the graph, to which we would like to define the \ref DistMap |
---|
| 796 | static DistMap *createDistMap(const GR &G) |
---|
| 797 | { |
---|
| 798 | return new DistMap(); |
---|
| 799 | } |
---|
| 800 | }; |
---|
| 801 | |
---|
[1123] | 802 | /// Default traits used by \ref DijkstraWizard |
---|
| 803 | |
---|
[1151] | 804 | /// To make it easier to use Dijkstra algorithm |
---|
| 805 | ///we have created a wizard class. |
---|
| 806 | /// This \ref DijkstraWizard class needs default traits, |
---|
| 807 | ///as well as the \ref Dijkstra class. |
---|
[1123] | 808 | /// The \ref DijkstraWizardBase is a class to be the default traits of the |
---|
| 809 | /// \ref DijkstraWizard class. |
---|
[1116] | 810 | template<class GR,class LM> |
---|
[1218] | 811 | class DijkstraWizardBase : public DijkstraWizardDefaultTraits<GR,LM> |
---|
[1116] | 812 | { |
---|
| 813 | |
---|
[1218] | 814 | typedef DijkstraWizardDefaultTraits<GR,LM> Base; |
---|
[1116] | 815 | protected: |
---|
[1201] | 816 | /// Type of the nodes in the graph. |
---|
| 817 | typedef typename Base::Graph::Node Node; |
---|
| 818 | |
---|
[1116] | 819 | /// Pointer to the underlying graph. |
---|
| 820 | void *_g; |
---|
| 821 | /// Pointer to the length map |
---|
| 822 | void *_length; |
---|
| 823 | ///Pointer to the map of predecessors edges. |
---|
| 824 | void *_pred; |
---|
[1218] | 825 | // ///Pointer to the map of predecessors nodes. |
---|
| 826 | // void *_predNode; |
---|
[1116] | 827 | ///Pointer to the map of distances. |
---|
| 828 | void *_dist; |
---|
| 829 | ///Pointer to the source node. |
---|
[1201] | 830 | Node _source; |
---|
[1116] | 831 | |
---|
| 832 | public: |
---|
[1123] | 833 | /// Constructor. |
---|
| 834 | |
---|
| 835 | /// This constructor does not require parameters, therefore it initiates |
---|
| 836 | /// all of the attributes to default values (0, INVALID). |
---|
[1218] | 837 | DijkstraWizardBase() : _g(0), _length(0), _pred(0), |
---|
| 838 | // _predNode(0), |
---|
| 839 | _dist(0), _source(INVALID) {} |
---|
[1116] | 840 | |
---|
[1123] | 841 | /// Constructor. |
---|
| 842 | |
---|
[1156] | 843 | /// This constructor requires some parameters, |
---|
| 844 | /// listed in the parameters list. |
---|
[1123] | 845 | /// Others are initiated to 0. |
---|
| 846 | /// \param g is the initial value of \ref _g |
---|
| 847 | /// \param l is the initial value of \ref _length |
---|
| 848 | /// \param s is the initial value of \ref _source |
---|
[1116] | 849 | DijkstraWizardBase(const GR &g,const LM &l, Node s=INVALID) : |
---|
[1218] | 850 | _g((void *)&g), _length((void *)&l), _pred(0), |
---|
| 851 | // _predNode(0), |
---|
| 852 | _dist(0), _source(s) {} |
---|
[1116] | 853 | |
---|
| 854 | }; |
---|
| 855 | |
---|
[1123] | 856 | /// A class to make easier the usage of Dijkstra algorithm |
---|
[953] | 857 | |
---|
[1123] | 858 | /// This class is created to make it easier to use Dijkstra algorithm. |
---|
| 859 | /// It uses the functions and features of the plain \ref Dijkstra, |
---|
[1151] | 860 | /// but it is much simpler to use it. |
---|
[953] | 861 | /// |
---|
[1123] | 862 | /// Simplicity means that the way to change the types defined |
---|
| 863 | /// in the traits class is based on functions that returns the new class |
---|
[1151] | 864 | /// and not on templatable built-in classes. |
---|
| 865 | /// When using the plain \ref Dijkstra |
---|
| 866 | /// the new class with the modified type comes from |
---|
| 867 | /// the original class by using the :: |
---|
| 868 | /// operator. In the case of \ref DijkstraWizard only |
---|
| 869 | /// a function have to be called and it will |
---|
[1123] | 870 | /// return the needed class. |
---|
| 871 | /// |
---|
| 872 | /// It does not have own \ref run method. When its \ref run method is called |
---|
| 873 | /// it initiates a plain \ref Dijkstra class, and calls the \ref Dijkstra::run |
---|
| 874 | /// method of it. |
---|
[953] | 875 | template<class TR> |
---|
[1116] | 876 | class DijkstraWizard : public TR |
---|
[953] | 877 | { |
---|
[1116] | 878 | typedef TR Base; |
---|
[953] | 879 | |
---|
[1123] | 880 | ///The type of the underlying graph. |
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[953] | 881 | typedef typename TR::Graph Graph; |
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[1119] | 882 | //\e |
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[953] | 883 | typedef typename Graph::Node Node; |
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[1119] | 884 | //\e |
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[953] | 885 | typedef typename Graph::NodeIt NodeIt; |
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[1119] | 886 | //\e |
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[953] | 887 | typedef typename Graph::Edge Edge; |
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[1119] | 888 | //\e |
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[953] | 889 | typedef typename Graph::OutEdgeIt OutEdgeIt; |
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| 890 | |
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[1123] | 891 | ///The type of the map that stores the edge lengths. |
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[953] | 892 | typedef typename TR::LengthMap LengthMap; |
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[1123] | 893 | ///The type of the length of the edges. |
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[987] | 894 | typedef typename LengthMap::Value Value; |
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[1123] | 895 | ///\brief The type of the map that stores the last |
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| 896 | ///edges of the shortest paths. |
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[953] | 897 | typedef typename TR::PredMap PredMap; |
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[1218] | 898 | // ///\brief The type of the map that stores the last but one |
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| 899 | // ///nodes of the shortest paths. |
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| 900 | // typedef typename TR::PredNodeMap PredNodeMap; |
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[1123] | 901 | ///The type of the map that stores the dists of the nodes. |
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[953] | 902 | typedef typename TR::DistMap DistMap; |
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| 903 | |
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[1123] | 904 | ///The heap type used by the dijkstra algorithm. |
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[953] | 905 | typedef typename TR::Heap Heap; |
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[1116] | 906 | public: |
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[1123] | 907 | /// Constructor. |
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[1116] | 908 | DijkstraWizard() : TR() {} |
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[953] | 909 | |
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[1123] | 910 | /// Constructor that requires parameters. |
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[1124] | 911 | |
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| 912 | /// Constructor that requires parameters. |
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[1123] | 913 | /// These parameters will be the default values for the traits class. |
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[1116] | 914 | DijkstraWizard(const Graph &g,const LengthMap &l, Node s=INVALID) : |
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| 915 | TR(g,l,s) {} |
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[953] | 916 | |
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[1123] | 917 | ///Copy constructor |
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[1116] | 918 | DijkstraWizard(const TR &b) : TR(b) {} |
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[953] | 919 | |
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[1116] | 920 | ~DijkstraWizard() {} |
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| 921 | |
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[1123] | 922 | ///Runs Dijkstra algorithm from a given node. |
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| 923 | |
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| 924 | ///Runs Dijkstra algorithm from a given node. |
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| 925 | ///The node can be given by the \ref source function. |
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[1116] | 926 | void run() |
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[953] | 927 | { |
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[1201] | 928 | if(Base::_source==INVALID) throw UninitializedParameter(); |
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[1193] | 929 | Dijkstra<Graph,LengthMap,TR> |
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| 930 | Dij(*(Graph*)Base::_g,*(LengthMap*)Base::_length); |
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| 931 | if(Base::_pred) Dij.predMap(*(PredMap*)Base::_pred); |
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[1218] | 932 | // if(Base::_predNode) Dij.predNodeMap(*(PredNodeMap*)Base::_predNode); |
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[1193] | 933 | if(Base::_dist) Dij.distMap(*(DistMap*)Base::_dist); |
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[1201] | 934 | Dij.run(Base::_source); |
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[1116] | 935 | } |
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| 936 | |
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[1124] | 937 | ///Runs Dijkstra algorithm from the given node. |
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[1123] | 938 | |
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[1124] | 939 | ///Runs Dijkstra algorithm from the given node. |
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[1123] | 940 | ///\param s is the given source. |
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[1116] | 941 | void run(Node s) |
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| 942 | { |
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[1201] | 943 | Base::_source=s; |
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[1116] | 944 | run(); |
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[953] | 945 | } |
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| 946 | |
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| 947 | template<class T> |
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[1116] | 948 | struct DefPredMapBase : public Base { |
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| 949 | typedef T PredMap; |
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[1117] | 950 | static PredMap *createPredMap(const Graph &G) { return 0; }; |
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| 951 | DefPredMapBase(const Base &b) : Base(b) {} |
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[1116] | 952 | }; |
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[953] | 953 | |
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[1156] | 954 | ///\brief \ref named-templ-param "Named parameter" |
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| 955 | ///function for setting PredMap type |
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| 956 | /// |
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| 957 | /// \ref named-templ-param "Named parameter" |
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| 958 | ///function for setting PredMap type |
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[1124] | 959 | /// |
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[953] | 960 | template<class T> |
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[1116] | 961 | DijkstraWizard<DefPredMapBase<T> > predMap(const T &t) |
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[953] | 962 | { |
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[1193] | 963 | Base::_pred=(void *)&t; |
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[1116] | 964 | return DijkstraWizard<DefPredMapBase<T> >(*this); |
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[953] | 965 | } |
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| 966 | |
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[1116] | 967 | |
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[1218] | 968 | // template<class T> |
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| 969 | // struct DefPredNodeMapBase : public Base { |
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| 970 | // typedef T PredNodeMap; |
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| 971 | // static PredNodeMap *createPredNodeMap(const Graph &G) { return 0; }; |
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| 972 | // DefPredNodeMapBase(const Base &b) : Base(b) {} |
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| 973 | // }; |
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[1116] | 974 | |
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[1218] | 975 | // ///\brief \ref named-templ-param "Named parameter" |
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| 976 | // ///function for setting PredNodeMap type |
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| 977 | // /// |
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| 978 | // /// \ref named-templ-param "Named parameter" |
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| 979 | // ///function for setting PredNodeMap type |
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| 980 | // /// |
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| 981 | // template<class T> |
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| 982 | // DijkstraWizard<DefPredNodeMapBase<T> > predNodeMap(const T &t) |
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| 983 | // { |
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| 984 | // Base::_predNode=(void *)&t; |
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| 985 | // return DijkstraWizard<DefPredNodeMapBase<T> >(*this); |
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| 986 | // } |
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[1116] | 987 | |
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| 988 | template<class T> |
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| 989 | struct DefDistMapBase : public Base { |
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| 990 | typedef T DistMap; |
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[1117] | 991 | static DistMap *createDistMap(const Graph &G) { return 0; }; |
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| 992 | DefDistMapBase(const Base &b) : Base(b) {} |
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[1116] | 993 | }; |
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[953] | 994 | |
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[1156] | 995 | ///\brief \ref named-templ-param "Named parameter" |
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| 996 | ///function for setting DistMap type |
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| 997 | /// |
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| 998 | /// \ref named-templ-param "Named parameter" |
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| 999 | ///function for setting DistMap type |
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[1124] | 1000 | /// |
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[953] | 1001 | template<class T> |
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[1116] | 1002 | DijkstraWizard<DefDistMapBase<T> > distMap(const T &t) |
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[953] | 1003 | { |
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[1193] | 1004 | Base::_dist=(void *)&t; |
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[1116] | 1005 | return DijkstraWizard<DefDistMapBase<T> >(*this); |
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[953] | 1006 | } |
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[1117] | 1007 | |
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[1123] | 1008 | /// Sets the source node, from which the Dijkstra algorithm runs. |
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| 1009 | |
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| 1010 | /// Sets the source node, from which the Dijkstra algorithm runs. |
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| 1011 | /// \param s is the source node. |
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[1117] | 1012 | DijkstraWizard<TR> &source(Node s) |
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[953] | 1013 | { |
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[1201] | 1014 | Base::_source=s; |
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[953] | 1015 | return *this; |
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| 1016 | } |
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| 1017 | |
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| 1018 | }; |
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[255] | 1019 | |
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[1218] | 1020 | ///Function type interface for Dijkstra algorithm. |
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[953] | 1021 | |
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[1151] | 1022 | /// \ingroup flowalgs |
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[1218] | 1023 | ///Function type interface for Dijkstra algorithm. |
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[953] | 1024 | /// |
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[1218] | 1025 | ///This function also has several |
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| 1026 | ///\ref named-templ-func-param "named parameters", |
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| 1027 | ///they are declared as the members of class \ref DijkstraWizard. |
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| 1028 | ///The following |
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| 1029 | ///example shows how to use these parameters. |
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| 1030 | ///\code |
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| 1031 | /// dijkstra(g,length,source).predMap(preds).run(); |
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| 1032 | ///\endcode |
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| 1033 | ///\warning Don't forget to put the \ref DijkstraWizard::run() "run()" |
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| 1034 | ///to the end of the parameter list. |
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| 1035 | ///\sa DijkstraWizard |
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| 1036 | ///\sa Dijkstra |
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[953] | 1037 | template<class GR, class LM> |
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[1116] | 1038 | DijkstraWizard<DijkstraWizardBase<GR,LM> > |
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| 1039 | dijkstra(const GR &g,const LM &l,typename GR::Node s=INVALID) |
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[953] | 1040 | { |
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[1116] | 1041 | return DijkstraWizard<DijkstraWizardBase<GR,LM> >(g,l,s); |
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[953] | 1042 | } |
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| 1043 | |
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[921] | 1044 | } //END OF NAMESPACE LEMON |
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[255] | 1045 | |
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| 1046 | #endif |
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| 1047 | |
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