[906] | 1 | /* -*- C++ -*- |
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| 2 | * |
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[1956] | 3 | * This file is a part of LEMON, a generic C++ optimization library |
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| 4 | * |
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| 5 | * Copyright (C) 2003-2006 |
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| 6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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[1359] | 7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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[906] | 8 | * |
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| 9 | * Permission to use, modify and distribute this software is granted |
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| 10 | * provided that this copyright notice appears in all copies. For |
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| 11 | * precise terms see the accompanying LICENSE file. |
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| 12 | * |
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| 13 | * This software is provided "AS IS" with no warranty of any kind, |
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| 14 | * express or implied, and with no claim as to its suitability for any |
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| 15 | * purpose. |
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| 16 | * |
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| 17 | */ |
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| 18 | |
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[921] | 19 | #ifndef LEMON_DIJKSTRA_H |
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| 20 | #define LEMON_DIJKSTRA_H |
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[255] | 21 | |
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[758] | 22 | ///\ingroup flowalgs |
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[255] | 23 | ///\file |
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| 24 | ///\brief Dijkstra algorithm. |
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[1283] | 25 | /// |
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[1734] | 26 | ///\todo dijkstraZero() solution should be revised. |
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[255] | 27 | |
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[953] | 28 | #include <lemon/list_graph.h> |
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[921] | 29 | #include <lemon/bin_heap.h> |
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[1993] | 30 | #include <lemon/bits/invalid.h> |
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[1119] | 31 | #include <lemon/error.h> |
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| 32 | #include <lemon/maps.h> |
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[255] | 33 | |
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[921] | 34 | namespace lemon { |
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[385] | 35 | |
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[1734] | 36 | template<class T> T dijkstraZero() {return 0;} |
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[1151] | 37 | |
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[954] | 38 | ///Default traits class of Dijkstra class. |
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| 39 | |
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| 40 | ///Default traits class of Dijkstra class. |
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| 41 | ///\param GR Graph type. |
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| 42 | ///\param LM Type of length map. |
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[953] | 43 | template<class GR, class LM> |
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| 44 | struct DijkstraDefaultTraits |
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| 45 | { |
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[954] | 46 | ///The graph type the algorithm runs on. |
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[953] | 47 | typedef GR Graph; |
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| 48 | ///The type of the map that stores the edge lengths. |
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| 49 | |
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[1124] | 50 | ///The type of the map that stores the edge lengths. |
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[967] | 51 | ///It must meet the \ref concept::ReadMap "ReadMap" concept. |
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[953] | 52 | typedef LM LengthMap; |
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[954] | 53 | //The type of the length of the edges. |
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[987] | 54 | typedef typename LM::Value Value; |
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[1721] | 55 | /// The cross reference type used by heap. |
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| 56 | |
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| 57 | /// The cross reference type used by heap. |
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| 58 | /// Usually it is \c Graph::NodeMap<int>. |
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| 59 | typedef typename Graph::template NodeMap<int> HeapCrossRef; |
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| 60 | ///Instantiates a HeapCrossRef. |
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| 61 | |
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| 62 | ///This function instantiates a \ref HeapCrossRef. |
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| 63 | /// \param G is the graph, to which we would like to define the |
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| 64 | /// HeapCrossRef. |
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| 65 | static HeapCrossRef *createHeapCrossRef(const GR &G) |
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| 66 | { |
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| 67 | return new HeapCrossRef(G); |
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| 68 | } |
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| 69 | |
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[954] | 70 | ///The heap type used by Dijkstra algorithm. |
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[967] | 71 | |
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| 72 | ///The heap type used by Dijkstra algorithm. |
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| 73 | /// |
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| 74 | ///\sa BinHeap |
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| 75 | ///\sa Dijkstra |
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[1709] | 76 | typedef BinHeap<typename Graph::Node, typename LM::Value, |
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[1741] | 77 | HeapCrossRef, std::less<Value> > Heap; |
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[953] | 78 | |
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[1721] | 79 | static Heap *createHeap(HeapCrossRef& R) |
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| 80 | { |
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| 81 | return new Heap(R); |
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| 82 | } |
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| 83 | |
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[953] | 84 | ///\brief The type of the map that stores the last |
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| 85 | ///edges of the shortest paths. |
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| 86 | /// |
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[1124] | 87 | ///The type of the map that stores the last |
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| 88 | ///edges of the shortest paths. |
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[967] | 89 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
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[953] | 90 | /// |
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[954] | 91 | typedef typename Graph::template NodeMap<typename GR::Edge> PredMap; |
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| 92 | ///Instantiates a PredMap. |
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[953] | 93 | |
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[1123] | 94 | ///This function instantiates a \ref PredMap. |
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| 95 | ///\param G is the graph, to which we would like to define the PredMap. |
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[1119] | 96 | ///\todo The graph alone may be insufficient for the initialization |
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[954] | 97 | static PredMap *createPredMap(const GR &G) |
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[953] | 98 | { |
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| 99 | return new PredMap(G); |
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| 100 | } |
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[1119] | 101 | |
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[1218] | 102 | ///The type of the map that stores whether a nodes is processed. |
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[1119] | 103 | |
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[1218] | 104 | ///The type of the map that stores whether a nodes is processed. |
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[1119] | 105 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
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| 106 | ///By default it is a NullMap. |
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[1218] | 107 | ///\todo If it is set to a real map, |
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| 108 | ///Dijkstra::processed() should read this. |
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[1119] | 109 | ///\todo named parameter to set this type, function to read and write. |
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[1218] | 110 | typedef NullMap<typename Graph::Node,bool> ProcessedMap; |
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| 111 | ///Instantiates a ProcessedMap. |
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[1119] | 112 | |
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[1218] | 113 | ///This function instantiates a \ref ProcessedMap. |
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[1536] | 114 | ///\param g is the graph, to which |
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[1218] | 115 | ///we would like to define the \ref ProcessedMap |
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[1536] | 116 | #ifdef DOXYGEN |
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| 117 | static ProcessedMap *createProcessedMap(const GR &g) |
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| 118 | #else |
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[1366] | 119 | static ProcessedMap *createProcessedMap(const GR &) |
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[1536] | 120 | #endif |
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[1119] | 121 | { |
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[1218] | 122 | return new ProcessedMap(); |
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[1119] | 123 | } |
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[953] | 124 | ///The type of the map that stores the dists of the nodes. |
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| 125 | |
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[1124] | 126 | ///The type of the map that stores the dists of the nodes. |
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[967] | 127 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
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[953] | 128 | /// |
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[987] | 129 | typedef typename Graph::template NodeMap<typename LM::Value> DistMap; |
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[954] | 130 | ///Instantiates a DistMap. |
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[953] | 131 | |
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[1123] | 132 | ///This function instantiates a \ref DistMap. |
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| 133 | ///\param G is the graph, to which we would like to define the \ref DistMap |
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[954] | 134 | static DistMap *createDistMap(const GR &G) |
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[953] | 135 | { |
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| 136 | return new DistMap(G); |
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| 137 | } |
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| 138 | }; |
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| 139 | |
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[255] | 140 | ///%Dijkstra algorithm class. |
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[1125] | 141 | |
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[1151] | 142 | /// \ingroup flowalgs |
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[255] | 143 | ///This class provides an efficient implementation of %Dijkstra algorithm. |
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| 144 | ///The edge lengths are passed to the algorithm using a |
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[959] | 145 | ///\ref concept::ReadMap "ReadMap", |
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[255] | 146 | ///so it is easy to change it to any kind of length. |
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| 147 | /// |
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[880] | 148 | ///The type of the length is determined by the |
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[987] | 149 | ///\ref concept::ReadMap::Value "Value" of the length map. |
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[255] | 150 | /// |
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| 151 | ///It is also possible to change the underlying priority heap. |
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| 152 | /// |
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[1218] | 153 | ///\param GR The graph type the algorithm runs on. The default value |
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| 154 | ///is \ref ListGraph. The value of GR is not used directly by |
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| 155 | ///Dijkstra, it is only passed to \ref DijkstraDefaultTraits. |
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| 156 | ///\param LM This read-only EdgeMap determines the lengths of the |
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| 157 | ///edges. It is read once for each edge, so the map may involve in |
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| 158 | ///relatively time consuming process to compute the edge length if |
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| 159 | ///it is necessary. The default map type is \ref |
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| 160 | ///concept::StaticGraph::EdgeMap "Graph::EdgeMap<int>". The value |
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| 161 | ///of LM is not used directly by Dijkstra, it is only passed to \ref |
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| 162 | ///DijkstraDefaultTraits. \param TR Traits class to set |
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| 163 | ///various data types used by the algorithm. The default traits |
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| 164 | ///class is \ref DijkstraDefaultTraits |
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| 165 | ///"DijkstraDefaultTraits<GR,LM>". See \ref |
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| 166 | ///DijkstraDefaultTraits for the documentation of a Dijkstra traits |
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| 167 | ///class. |
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[456] | 168 | /// |
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[689] | 169 | ///\author Jacint Szabo and Alpar Juttner |
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[584] | 170 | |
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[255] | 171 | #ifdef DOXYGEN |
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[584] | 172 | template <typename GR, |
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| 173 | typename LM, |
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[953] | 174 | typename TR> |
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[255] | 175 | #else |
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[953] | 176 | template <typename GR=ListGraph, |
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[584] | 177 | typename LM=typename GR::template EdgeMap<int>, |
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[953] | 178 | typename TR=DijkstraDefaultTraits<GR,LM> > |
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[255] | 179 | #endif |
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[1116] | 180 | class Dijkstra { |
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[255] | 181 | public: |
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[1125] | 182 | /** |
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| 183 | * \brief \ref Exception for uninitialized parameters. |
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| 184 | * |
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| 185 | * This error represents problems in the initialization |
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| 186 | * of the parameters of the algorithms. |
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| 187 | */ |
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| 188 | class UninitializedParameter : public lemon::UninitializedParameter { |
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| 189 | public: |
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| 190 | virtual const char* exceptionName() const { |
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[1218] | 191 | return "lemon::Dijkstra::UninitializedParameter"; |
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[1125] | 192 | } |
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| 193 | }; |
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[1119] | 194 | |
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[953] | 195 | typedef TR Traits; |
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[584] | 196 | ///The type of the underlying graph. |
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[954] | 197 | typedef typename TR::Graph Graph; |
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[911] | 198 | ///\e |
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[255] | 199 | typedef typename Graph::Node Node; |
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[911] | 200 | ///\e |
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[255] | 201 | typedef typename Graph::NodeIt NodeIt; |
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[911] | 202 | ///\e |
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[255] | 203 | typedef typename Graph::Edge Edge; |
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[911] | 204 | ///\e |
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[255] | 205 | typedef typename Graph::OutEdgeIt OutEdgeIt; |
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| 206 | |
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[584] | 207 | ///The type of the length of the edges. |
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[987] | 208 | typedef typename TR::LengthMap::Value Value; |
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[693] | 209 | ///The type of the map that stores the edge lengths. |
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[954] | 210 | typedef typename TR::LengthMap LengthMap; |
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[693] | 211 | ///\brief The type of the map that stores the last |
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[584] | 212 | ///edges of the shortest paths. |
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[953] | 213 | typedef typename TR::PredMap PredMap; |
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[1218] | 214 | ///The type of the map indicating if a node is processed. |
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| 215 | typedef typename TR::ProcessedMap ProcessedMap; |
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[693] | 216 | ///The type of the map that stores the dists of the nodes. |
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[953] | 217 | typedef typename TR::DistMap DistMap; |
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[1721] | 218 | ///The cross reference type used for the current heap. |
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| 219 | typedef typename TR::HeapCrossRef HeapCrossRef; |
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[953] | 220 | ///The heap type used by the dijkstra algorithm. |
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| 221 | typedef typename TR::Heap Heap; |
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[255] | 222 | private: |
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[802] | 223 | /// Pointer to the underlying graph. |
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[688] | 224 | const Graph *G; |
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[802] | 225 | /// Pointer to the length map |
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[954] | 226 | const LengthMap *length; |
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[802] | 227 | ///Pointer to the map of predecessors edges. |
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[1119] | 228 | PredMap *_pred; |
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| 229 | ///Indicates if \ref _pred is locally allocated (\c true) or not. |
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| 230 | bool local_pred; |
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[802] | 231 | ///Pointer to the map of distances. |
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[1130] | 232 | DistMap *_dist; |
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| 233 | ///Indicates if \ref _dist is locally allocated (\c true) or not. |
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| 234 | bool local_dist; |
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[1218] | 235 | ///Pointer to the map of processed status of the nodes. |
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| 236 | ProcessedMap *_processed; |
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| 237 | ///Indicates if \ref _processed is locally allocated (\c true) or not. |
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| 238 | bool local_processed; |
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[1721] | 239 | ///Pointer to the heap cross references. |
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| 240 | HeapCrossRef *_heap_cross_ref; |
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| 241 | ///Indicates if \ref _heap_cross_ref is locally allocated (\c true) or not. |
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| 242 | bool local_heap_cross_ref; |
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| 243 | ///Pointer to the heap. |
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| 244 | Heap *_heap; |
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| 245 | ///Indicates if \ref _heap is locally allocated (\c true) or not. |
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| 246 | bool local_heap; |
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[688] | 247 | |
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[1128] | 248 | ///Creates the maps if necessary. |
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[688] | 249 | |
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| 250 | ///\todo Better memory allocation (instead of new). |
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[1128] | 251 | void create_maps() |
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[688] | 252 | { |
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[1119] | 253 | if(!_pred) { |
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| 254 | local_pred = true; |
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| 255 | _pred = Traits::createPredMap(*G); |
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[688] | 256 | } |
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[1130] | 257 | if(!_dist) { |
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| 258 | local_dist = true; |
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| 259 | _dist = Traits::createDistMap(*G); |
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[688] | 260 | } |
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[1218] | 261 | if(!_processed) { |
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| 262 | local_processed = true; |
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| 263 | _processed = Traits::createProcessedMap(*G); |
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[1119] | 264 | } |
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[1721] | 265 | if (!_heap_cross_ref) { |
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| 266 | local_heap_cross_ref = true; |
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| 267 | _heap_cross_ref = Traits::createHeapCrossRef(*G); |
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| 268 | } |
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| 269 | if (!_heap) { |
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| 270 | local_heap = true; |
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| 271 | _heap = Traits::createHeap(*_heap_cross_ref); |
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| 272 | } |
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[688] | 273 | } |
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[255] | 274 | |
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| 275 | public : |
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[1710] | 276 | |
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| 277 | typedef Dijkstra Create; |
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[1116] | 278 | |
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[1128] | 279 | ///\name Named template parameters |
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| 280 | |
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| 281 | ///@{ |
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| 282 | |
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[953] | 283 | template <class T> |
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[1116] | 284 | struct DefPredMapTraits : public Traits { |
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[953] | 285 | typedef T PredMap; |
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[2010] | 286 | static PredMap *createPredMap(const Graph &) |
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[953] | 287 | { |
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[1126] | 288 | throw UninitializedParameter(); |
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[953] | 289 | } |
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| 290 | }; |
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[954] | 291 | ///\ref named-templ-param "Named parameter" for setting PredMap type |
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| 292 | |
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| 293 | ///\ref named-templ-param "Named parameter" for setting PredMap type |
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[1043] | 294 | /// |
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[953] | 295 | template <class T> |
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[1709] | 296 | struct DefPredMap |
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| 297 | : public Dijkstra< Graph, LengthMap, DefPredMapTraits<T> > { |
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| 298 | typedef Dijkstra< Graph, LengthMap, DefPredMapTraits<T> > Create; |
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| 299 | }; |
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[953] | 300 | |
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| 301 | template <class T> |
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[1116] | 302 | struct DefDistMapTraits : public Traits { |
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[953] | 303 | typedef T DistMap; |
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[2010] | 304 | static DistMap *createDistMap(const Graph &) |
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[953] | 305 | { |
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[1126] | 306 | throw UninitializedParameter(); |
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[953] | 307 | } |
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| 308 | }; |
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[954] | 309 | ///\ref named-templ-param "Named parameter" for setting DistMap type |
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| 310 | |
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| 311 | ///\ref named-templ-param "Named parameter" for setting DistMap type |
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[1043] | 312 | /// |
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[953] | 313 | template <class T> |
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[1709] | 314 | struct DefDistMap |
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| 315 | : public Dijkstra< Graph, LengthMap, DefDistMapTraits<T> > { |
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| 316 | typedef Dijkstra< Graph, LengthMap, DefDistMapTraits<T> > Create; |
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| 317 | }; |
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[953] | 318 | |
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[1128] | 319 | template <class T> |
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[1218] | 320 | struct DefProcessedMapTraits : public Traits { |
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| 321 | typedef T ProcessedMap; |
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| 322 | static ProcessedMap *createProcessedMap(const Graph &G) |
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[1128] | 323 | { |
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| 324 | throw UninitializedParameter(); |
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| 325 | } |
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| 326 | }; |
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[1218] | 327 | ///\ref named-templ-param "Named parameter" for setting ProcessedMap type |
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[1128] | 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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| 331 | template <class T> |
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[1709] | 332 | struct DefProcessedMap |
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| 333 | : public Dijkstra< Graph, LengthMap, DefProcessedMapTraits<T> > { |
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| 334 | typedef Dijkstra< Graph, LengthMap, DefProcessedMapTraits<T> > Create; |
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| 335 | }; |
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[1128] | 336 | |
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[1218] | 337 | struct DefGraphProcessedMapTraits : public Traits { |
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| 338 | typedef typename Graph::template NodeMap<bool> ProcessedMap; |
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| 339 | static ProcessedMap *createProcessedMap(const Graph &G) |
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[1128] | 340 | { |
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[1218] | 341 | return new ProcessedMap(G); |
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[1128] | 342 | } |
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| 343 | }; |
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| 344 | ///\brief \ref named-templ-param "Named parameter" |
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[1218] | 345 | ///for setting the ProcessedMap type to be Graph::NodeMap<bool>. |
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[1128] | 346 | /// |
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| 347 | ///\ref named-templ-param "Named parameter" |
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[1218] | 348 | ///for setting the ProcessedMap type to be Graph::NodeMap<bool>. |
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[1128] | 349 | ///If you don't set it explicitely, it will be automatically allocated. |
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| 350 | template <class T> |
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[1709] | 351 | struct DefProcessedMapToBeDefaultMap |
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| 352 | : public Dijkstra< Graph, LengthMap, DefGraphProcessedMapTraits> { |
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| 353 | typedef Dijkstra< Graph, LengthMap, DefGraphProcessedMapTraits> Create; |
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| 354 | }; |
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[1721] | 355 | |
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| 356 | template <class H, class CR> |
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| 357 | struct DefHeapTraits : public Traits { |
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| 358 | typedef CR HeapCrossRef; |
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| 359 | typedef H Heap; |
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[1741] | 360 | static HeapCrossRef *createHeapCrossRef(const Graph &) { |
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| 361 | throw UninitializedParameter(); |
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[1721] | 362 | } |
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[1741] | 363 | static Heap *createHeap(HeapCrossRef &) |
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[1721] | 364 | { |
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[1741] | 365 | throw UninitializedParameter(); |
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[1721] | 366 | } |
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| 367 | }; |
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| 368 | ///\ref named-templ-param "Named parameter" for setting heap and cross |
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| 369 | ///reference type |
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| 370 | |
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| 371 | ///\ref named-templ-param "Named parameter" for setting heap and cross |
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| 372 | ///reference type |
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| 373 | /// |
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| 374 | template <class H, class CR = typename Graph::template NodeMap<int> > |
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| 375 | struct DefHeap |
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| 376 | : public Dijkstra< Graph, LengthMap, DefHeapTraits<H, CR> > { |
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| 377 | typedef Dijkstra< Graph, LengthMap, DefHeapTraits<H, CR> > Create; |
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| 378 | }; |
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[1741] | 379 | |
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| 380 | template <class H, class CR> |
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| 381 | struct DefStandardHeapTraits : public Traits { |
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| 382 | typedef CR HeapCrossRef; |
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| 383 | typedef H Heap; |
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| 384 | static HeapCrossRef *createHeapCrossRef(const Graph &G) { |
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| 385 | return new HeapCrossRef(G); |
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| 386 | } |
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| 387 | static Heap *createHeap(HeapCrossRef &R) |
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| 388 | { |
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| 389 | return new Heap(R); |
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| 390 | } |
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| 391 | }; |
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| 392 | ///\ref named-templ-param "Named parameter" for setting heap and cross |
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| 393 | ///reference type with automatic allocation |
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| 394 | |
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| 395 | ///\ref named-templ-param "Named parameter" for setting heap and cross |
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| 396 | ///reference type. It can allocate the heap and the cross reference |
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| 397 | ///object if the cross reference's constructor waits for the graph as |
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| 398 | ///parameter and the heap's constructor waits for the cross reference. |
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| 399 | template <class H, class CR = typename Graph::template NodeMap<int> > |
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| 400 | struct DefStandardHeap |
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| 401 | : public Dijkstra< Graph, LengthMap, DefStandardHeapTraits<H, CR> > { |
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| 402 | typedef Dijkstra< Graph, LengthMap, DefStandardHeapTraits<H, CR> > |
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| 403 | Create; |
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| 404 | }; |
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[1128] | 405 | |
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| 406 | ///@} |
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| 407 | |
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| 408 | |
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[1710] | 409 | protected: |
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| 410 | |
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| 411 | Dijkstra() {} |
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| 412 | |
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[1128] | 413 | public: |
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| 414 | |
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[802] | 415 | ///Constructor. |
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[255] | 416 | |
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[802] | 417 | ///\param _G the graph the algorithm will run on. |
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| 418 | ///\param _length the length map used by the algorithm. |
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[954] | 419 | Dijkstra(const Graph& _G, const LengthMap& _length) : |
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[688] | 420 | G(&_G), length(&_length), |
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[1119] | 421 | _pred(NULL), local_pred(false), |
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[1130] | 422 | _dist(NULL), local_dist(false), |
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[1218] | 423 | _processed(NULL), local_processed(false), |
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[1721] | 424 | _heap_cross_ref(NULL), local_heap_cross_ref(false), |
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| 425 | _heap(NULL), local_heap(false) |
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[688] | 426 | { } |
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| 427 | |
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[802] | 428 | ///Destructor. |
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[688] | 429 | ~Dijkstra() |
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| 430 | { |
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[1119] | 431 | if(local_pred) delete _pred; |
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[1130] | 432 | if(local_dist) delete _dist; |
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[1218] | 433 | if(local_processed) delete _processed; |
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[1721] | 434 | if(local_heap_cross_ref) delete _heap_cross_ref; |
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| 435 | if(local_heap) delete _heap; |
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[688] | 436 | } |
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| 437 | |
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| 438 | ///Sets the length map. |
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| 439 | |
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| 440 | ///Sets the length map. |
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| 441 | ///\return <tt> (*this) </tt> |
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[1116] | 442 | Dijkstra &lengthMap(const LengthMap &m) |
---|
[688] | 443 | { |
---|
| 444 | length = &m; |
---|
| 445 | return *this; |
---|
| 446 | } |
---|
| 447 | |
---|
| 448 | ///Sets the map storing the predecessor edges. |
---|
| 449 | |
---|
| 450 | ///Sets the map storing the predecessor edges. |
---|
| 451 | ///If you don't use this function before calling \ref run(), |
---|
| 452 | ///it will allocate one. The destuctor deallocates this |
---|
| 453 | ///automatically allocated map, of course. |
---|
| 454 | ///\return <tt> (*this) </tt> |
---|
[1116] | 455 | Dijkstra &predMap(PredMap &m) |
---|
[688] | 456 | { |
---|
[1119] | 457 | if(local_pred) { |
---|
| 458 | delete _pred; |
---|
| 459 | local_pred=false; |
---|
[688] | 460 | } |
---|
[1119] | 461 | _pred = &m; |
---|
[688] | 462 | return *this; |
---|
| 463 | } |
---|
| 464 | |
---|
| 465 | ///Sets the map storing the distances calculated by the algorithm. |
---|
| 466 | |
---|
| 467 | ///Sets the map storing the distances calculated by the algorithm. |
---|
| 468 | ///If you don't use this function before calling \ref run(), |
---|
| 469 | ///it will allocate one. The destuctor deallocates this |
---|
| 470 | ///automatically allocated map, of course. |
---|
| 471 | ///\return <tt> (*this) </tt> |
---|
[1116] | 472 | Dijkstra &distMap(DistMap &m) |
---|
[688] | 473 | { |
---|
[1130] | 474 | if(local_dist) { |
---|
| 475 | delete _dist; |
---|
| 476 | local_dist=false; |
---|
[688] | 477 | } |
---|
[1130] | 478 | _dist = &m; |
---|
[688] | 479 | return *this; |
---|
| 480 | } |
---|
[694] | 481 | |
---|
[1741] | 482 | ///Sets the heap and the cross reference used by algorithm. |
---|
| 483 | |
---|
| 484 | ///Sets the heap and the cross reference used by algorithm. |
---|
| 485 | ///If you don't use this function before calling \ref run(), |
---|
| 486 | ///it will allocate one. The destuctor deallocates this |
---|
[1981] | 487 | ///automatically allocated heap and cross reference, of course. |
---|
[1741] | 488 | ///\return <tt> (*this) </tt> |
---|
| 489 | Dijkstra &heap(Heap& heap, HeapCrossRef &crossRef) |
---|
| 490 | { |
---|
| 491 | if(local_heap_cross_ref) { |
---|
| 492 | delete _heap_cross_ref; |
---|
| 493 | local_heap_cross_ref=false; |
---|
| 494 | } |
---|
| 495 | _heap_cross_ref = &crossRef; |
---|
| 496 | if(local_heap) { |
---|
| 497 | delete _heap; |
---|
| 498 | local_heap=false; |
---|
| 499 | } |
---|
| 500 | _heap = &heap; |
---|
| 501 | return *this; |
---|
| 502 | } |
---|
| 503 | |
---|
[1130] | 504 | private: |
---|
| 505 | void finalizeNodeData(Node v,Value dst) |
---|
| 506 | { |
---|
[1218] | 507 | _processed->set(v,true); |
---|
[1130] | 508 | _dist->set(v, dst); |
---|
| 509 | } |
---|
| 510 | |
---|
| 511 | public: |
---|
[1218] | 512 | ///\name Execution control |
---|
[1128] | 513 | ///The simplest way to execute the algorithm is to use |
---|
[1156] | 514 | ///one of the member functions called \c run(...). |
---|
[1128] | 515 | ///\n |
---|
[1218] | 516 | ///If you need more control on the execution, |
---|
[1128] | 517 | ///first you must call \ref init(), then you can add several source nodes |
---|
[1218] | 518 | ///with \ref addSource(). |
---|
| 519 | ///Finally \ref start() will perform the actual path |
---|
[1128] | 520 | ///computation. |
---|
| 521 | |
---|
| 522 | ///@{ |
---|
| 523 | |
---|
| 524 | ///Initializes the internal data structures. |
---|
| 525 | |
---|
| 526 | ///Initializes the internal data structures. |
---|
| 527 | /// |
---|
| 528 | void init() |
---|
| 529 | { |
---|
| 530 | create_maps(); |
---|
[1721] | 531 | _heap->clear(); |
---|
[774] | 532 | for ( NodeIt u(*G) ; u!=INVALID ; ++u ) { |
---|
[1119] | 533 | _pred->set(u,INVALID); |
---|
[1218] | 534 | _processed->set(u,false); |
---|
[1721] | 535 | _heap_cross_ref->set(u,Heap::PRE_HEAP); |
---|
[694] | 536 | } |
---|
[1128] | 537 | } |
---|
| 538 | |
---|
| 539 | ///Adds a new source node. |
---|
| 540 | |
---|
[1155] | 541 | ///Adds a new source node to the priority heap. |
---|
[1128] | 542 | /// |
---|
| 543 | ///The optional second parameter is the initial distance of the node. |
---|
| 544 | /// |
---|
[1155] | 545 | ///It checks if the node has already been added to the heap and |
---|
[1988] | 546 | ///it is pushed to the heap only if either it was not in the heap |
---|
| 547 | ///or the shortest path found till then is shorter than \c dst. |
---|
[1734] | 548 | void addSource(Node s,Value dst=dijkstraZero<Value>()) |
---|
[1128] | 549 | { |
---|
[1721] | 550 | if(_heap->state(s) != Heap::IN_HEAP) { |
---|
| 551 | _heap->push(s,dst); |
---|
| 552 | } else if((*_heap)[s]<dst) { |
---|
[1988] | 553 | _heap->set(s,dst); |
---|
[1155] | 554 | _pred->set(s,INVALID); |
---|
| 555 | } |
---|
[1128] | 556 | } |
---|
| 557 | |
---|
[1155] | 558 | ///Processes the next node in the priority heap |
---|
| 559 | |
---|
| 560 | ///Processes the next node in the priority heap. |
---|
| 561 | /// |
---|
[1516] | 562 | ///\return The processed node. |
---|
| 563 | /// |
---|
[1155] | 564 | ///\warning The priority heap must not be empty! |
---|
[1516] | 565 | Node processNextNode() |
---|
[1128] | 566 | { |
---|
[1721] | 567 | Node v=_heap->top(); |
---|
| 568 | Value oldvalue=_heap->prio(); |
---|
| 569 | _heap->pop(); |
---|
[1130] | 570 | finalizeNodeData(v,oldvalue); |
---|
[694] | 571 | |
---|
[1128] | 572 | for(OutEdgeIt e(*G,v); e!=INVALID; ++e) { |
---|
| 573 | Node w=G->target(e); |
---|
[1721] | 574 | switch(_heap->state(w)) { |
---|
[1128] | 575 | case Heap::PRE_HEAP: |
---|
[1721] | 576 | _heap->push(w,oldvalue+(*length)[e]); |
---|
[1128] | 577 | _pred->set(w,e); |
---|
| 578 | break; |
---|
| 579 | case Heap::IN_HEAP: |
---|
[1721] | 580 | if ( oldvalue+(*length)[e] < (*_heap)[w] ) { |
---|
| 581 | _heap->decrease(w, oldvalue+(*length)[e]); |
---|
[1119] | 582 | _pred->set(w,e); |
---|
[694] | 583 | } |
---|
[1128] | 584 | break; |
---|
| 585 | case Heap::POST_HEAP: |
---|
| 586 | break; |
---|
[694] | 587 | } |
---|
| 588 | } |
---|
[1516] | 589 | return v; |
---|
[694] | 590 | } |
---|
[1128] | 591 | |
---|
[1665] | 592 | ///Next node to be processed. |
---|
| 593 | |
---|
| 594 | ///Next node to be processed. |
---|
| 595 | /// |
---|
| 596 | ///\return The next node to be processed or INVALID if the priority heap |
---|
| 597 | /// is empty. |
---|
[1694] | 598 | Node nextNode() |
---|
[1665] | 599 | { |
---|
[1721] | 600 | return _heap->empty()?_heap->top():INVALID; |
---|
[1665] | 601 | } |
---|
| 602 | |
---|
[1218] | 603 | ///\brief Returns \c false if there are nodes |
---|
| 604 | ///to be processed in the priority heap |
---|
[1155] | 605 | /// |
---|
[1218] | 606 | ///Returns \c false if there are nodes |
---|
| 607 | ///to be processed in the priority heap |
---|
[1721] | 608 | bool emptyQueue() { return _heap->empty(); } |
---|
[1155] | 609 | ///Returns the number of the nodes to be processed in the priority heap |
---|
| 610 | |
---|
| 611 | ///Returns the number of the nodes to be processed in the priority heap |
---|
| 612 | /// |
---|
[1721] | 613 | int queueSize() { return _heap->size(); } |
---|
[1155] | 614 | |
---|
[1130] | 615 | ///Executes the algorithm. |
---|
[1128] | 616 | |
---|
[1130] | 617 | ///Executes the algorithm. |
---|
[1128] | 618 | /// |
---|
[1130] | 619 | ///\pre init() must be called and at least one node should be added |
---|
| 620 | ///with addSource() before using this function. |
---|
[1128] | 621 | /// |
---|
| 622 | ///This method runs the %Dijkstra algorithm from the root node(s) |
---|
| 623 | ///in order to |
---|
| 624 | ///compute the |
---|
| 625 | ///shortest path to each node. The algorithm computes |
---|
| 626 | ///- The shortest path tree. |
---|
| 627 | ///- The distance of each node from the root(s). |
---|
| 628 | /// |
---|
| 629 | void start() |
---|
| 630 | { |
---|
[1721] | 631 | while ( !_heap->empty() ) processNextNode(); |
---|
[1128] | 632 | } |
---|
[255] | 633 | |
---|
[1130] | 634 | ///Executes the algorithm until \c dest is reached. |
---|
[1128] | 635 | |
---|
[1130] | 636 | ///Executes the algorithm until \c dest is reached. |
---|
[1128] | 637 | /// |
---|
[1130] | 638 | ///\pre init() must be called and at least one node should be added |
---|
| 639 | ///with addSource() before using this function. |
---|
[1128] | 640 | /// |
---|
| 641 | ///This method runs the %Dijkstra algorithm from the root node(s) |
---|
| 642 | ///in order to |
---|
| 643 | ///compute the |
---|
| 644 | ///shortest path to \c dest. The algorithm computes |
---|
| 645 | ///- The shortest path to \c dest. |
---|
| 646 | ///- The distance of \c dest from the root(s). |
---|
| 647 | /// |
---|
| 648 | void start(Node dest) |
---|
| 649 | { |
---|
[1721] | 650 | while ( !_heap->empty() && _heap->top()!=dest ) processNextNode(); |
---|
| 651 | if ( !_heap->empty() ) finalizeNodeData(_heap->top(),_heap->prio()); |
---|
[1130] | 652 | } |
---|
| 653 | |
---|
| 654 | ///Executes the algorithm until a condition is met. |
---|
| 655 | |
---|
| 656 | ///Executes the algorithm until a condition is met. |
---|
| 657 | /// |
---|
| 658 | ///\pre init() must be called and at least one node should be added |
---|
| 659 | ///with addSource() before using this function. |
---|
| 660 | /// |
---|
| 661 | ///\param nm must be a bool (or convertible) node map. The algorithm |
---|
| 662 | ///will stop when it reaches a node \c v with <tt>nm[v]==true</tt>. |
---|
[1345] | 663 | template<class NodeBoolMap> |
---|
| 664 | void start(const NodeBoolMap &nm) |
---|
[1130] | 665 | { |
---|
[1721] | 666 | while ( !_heap->empty() && !nm[_heap->top()] ) processNextNode(); |
---|
| 667 | if ( !_heap->empty() ) finalizeNodeData(_heap->top(),_heap->prio()); |
---|
[1128] | 668 | } |
---|
| 669 | |
---|
| 670 | ///Runs %Dijkstra algorithm from node \c s. |
---|
| 671 | |
---|
| 672 | ///This method runs the %Dijkstra algorithm from a root node \c s |
---|
| 673 | ///in order to |
---|
| 674 | ///compute the |
---|
| 675 | ///shortest path to each node. The algorithm computes |
---|
| 676 | ///- The shortest path tree. |
---|
| 677 | ///- The distance of each node from the root. |
---|
| 678 | /// |
---|
| 679 | ///\note d.run(s) is just a shortcut of the following code. |
---|
| 680 | ///\code |
---|
| 681 | /// d.init(); |
---|
| 682 | /// d.addSource(s); |
---|
| 683 | /// d.start(); |
---|
| 684 | ///\endcode |
---|
| 685 | void run(Node s) { |
---|
| 686 | init(); |
---|
| 687 | addSource(s); |
---|
| 688 | start(); |
---|
| 689 | } |
---|
| 690 | |
---|
[1130] | 691 | ///Finds the shortest path between \c s and \c t. |
---|
| 692 | |
---|
| 693 | ///Finds the shortest path between \c s and \c t. |
---|
| 694 | /// |
---|
| 695 | ///\return The length of the shortest s---t path if there exists one, |
---|
| 696 | ///0 otherwise. |
---|
| 697 | ///\note Apart from the return value, d.run(s) is |
---|
| 698 | ///just a shortcut of the following code. |
---|
| 699 | ///\code |
---|
| 700 | /// d.init(); |
---|
| 701 | /// d.addSource(s); |
---|
| 702 | /// d.start(t); |
---|
| 703 | ///\endcode |
---|
| 704 | Value run(Node s,Node t) { |
---|
| 705 | init(); |
---|
| 706 | addSource(s); |
---|
| 707 | start(t); |
---|
[1734] | 708 | return (*_pred)[t]==INVALID?dijkstraZero<Value>():(*_dist)[t]; |
---|
[1130] | 709 | } |
---|
| 710 | |
---|
[1128] | 711 | ///@} |
---|
| 712 | |
---|
| 713 | ///\name Query Functions |
---|
| 714 | ///The result of the %Dijkstra algorithm can be obtained using these |
---|
| 715 | ///functions.\n |
---|
| 716 | ///Before the use of these functions, |
---|
| 717 | ///either run() or start() must be called. |
---|
| 718 | |
---|
| 719 | ///@{ |
---|
| 720 | |
---|
[1283] | 721 | ///Copies the shortest path to \c t into \c p |
---|
| 722 | |
---|
| 723 | ///This function copies the shortest path to \c t into \c p. |
---|
[1536] | 724 | ///If it \c t is a source itself or unreachable, then it does not |
---|
[1283] | 725 | ///alter \c p. |
---|
| 726 | ///\return Returns \c true if a path to \c t was actually copied to \c p, |
---|
| 727 | ///\c false otherwise. |
---|
| 728 | ///\sa DirPath |
---|
| 729 | template<class P> |
---|
| 730 | bool getPath(P &p,Node t) |
---|
| 731 | { |
---|
| 732 | if(reached(t)) { |
---|
| 733 | p.clear(); |
---|
| 734 | typename P::Builder b(p); |
---|
[1763] | 735 | for(b.setStartNode(t);predEdge(t)!=INVALID;t=predNode(t)) |
---|
| 736 | b.pushFront(predEdge(t)); |
---|
[1283] | 737 | b.commit(); |
---|
| 738 | return true; |
---|
| 739 | } |
---|
| 740 | return false; |
---|
| 741 | } |
---|
| 742 | |
---|
[385] | 743 | ///The distance of a node from the root. |
---|
[255] | 744 | |
---|
[385] | 745 | ///Returns the distance of a node from the root. |
---|
[255] | 746 | ///\pre \ref run() must be called before using this function. |
---|
[385] | 747 | ///\warning If node \c v in unreachable from the root the return value |
---|
[255] | 748 | ///of this funcion is undefined. |
---|
[1130] | 749 | Value dist(Node v) const { return (*_dist)[v]; } |
---|
[373] | 750 | |
---|
[584] | 751 | ///Returns the 'previous edge' of the shortest path tree. |
---|
[255] | 752 | |
---|
[584] | 753 | ///For a node \c v it returns the 'previous edge' of the shortest path tree, |
---|
[785] | 754 | ///i.e. it returns the last edge of a shortest path from the root to \c |
---|
[688] | 755 | ///v. It is \ref INVALID |
---|
| 756 | ///if \c v is unreachable from the root or if \c v=s. The |
---|
[385] | 757 | ///shortest path tree used here is equal to the shortest path tree used in |
---|
[1631] | 758 | ///\ref predNode(). \pre \ref run() must be called before using |
---|
[385] | 759 | ///this function. |
---|
[1763] | 760 | Edge predEdge(Node v) const { return (*_pred)[v]; } |
---|
[373] | 761 | |
---|
[584] | 762 | ///Returns the 'previous node' of the shortest path tree. |
---|
[255] | 763 | |
---|
[584] | 764 | ///For a node \c v it returns the 'previous node' of the shortest path tree, |
---|
[385] | 765 | ///i.e. it returns the last but one node from a shortest path from the |
---|
| 766 | ///root to \c /v. It is INVALID if \c v is unreachable from the root or if |
---|
| 767 | ///\c v=s. The shortest path tree used here is equal to the shortest path |
---|
[1763] | 768 | ///tree used in \ref predEdge(). \pre \ref run() must be called before |
---|
[385] | 769 | ///using this function. |
---|
[1130] | 770 | Node predNode(Node v) const { return (*_pred)[v]==INVALID ? INVALID: |
---|
| 771 | G->source((*_pred)[v]); } |
---|
[255] | 772 | |
---|
| 773 | ///Returns a reference to the NodeMap of distances. |
---|
| 774 | |
---|
[385] | 775 | ///Returns a reference to the NodeMap of distances. \pre \ref run() must |
---|
| 776 | ///be called before using this function. |
---|
[1130] | 777 | const DistMap &distMap() const { return *_dist;} |
---|
[385] | 778 | |
---|
[255] | 779 | ///Returns a reference to the shortest path tree map. |
---|
| 780 | |
---|
| 781 | ///Returns a reference to the NodeMap of the edges of the |
---|
| 782 | ///shortest path tree. |
---|
| 783 | ///\pre \ref run() must be called before using this function. |
---|
[1119] | 784 | const PredMap &predMap() const { return *_pred;} |
---|
[385] | 785 | |
---|
| 786 | ///Checks if a node is reachable from the root. |
---|
[255] | 787 | |
---|
[385] | 788 | ///Returns \c true if \c v is reachable from the root. |
---|
[1218] | 789 | ///\warning The source nodes are inditated as unreached. |
---|
[255] | 790 | ///\pre \ref run() must be called before using this function. |
---|
[385] | 791 | /// |
---|
[1721] | 792 | bool reached(Node v) { return (*_heap_cross_ref)[v] != Heap::PRE_HEAP; } |
---|
[1734] | 793 | |
---|
| 794 | ///Checks if a node is processed. |
---|
| 795 | |
---|
| 796 | ///Returns \c true if \c v is processed, i.e. the shortest |
---|
| 797 | ///path to \c v has already found. |
---|
| 798 | ///\pre \ref run() must be called before using this function. |
---|
| 799 | /// |
---|
| 800 | bool processed(Node v) { return (*_heap_cross_ref)[v] == Heap::POST_HEAP; } |
---|
[255] | 801 | |
---|
[1128] | 802 | ///@} |
---|
[255] | 803 | }; |
---|
[953] | 804 | |
---|
[1218] | 805 | |
---|
| 806 | |
---|
| 807 | |
---|
| 808 | |
---|
| 809 | ///Default traits class of Dijkstra function. |
---|
| 810 | |
---|
| 811 | ///Default traits class of Dijkstra function. |
---|
| 812 | ///\param GR Graph type. |
---|
| 813 | ///\param LM Type of length map. |
---|
| 814 | template<class GR, class LM> |
---|
| 815 | struct DijkstraWizardDefaultTraits |
---|
| 816 | { |
---|
| 817 | ///The graph type the algorithm runs on. |
---|
| 818 | typedef GR Graph; |
---|
| 819 | ///The type of the map that stores the edge lengths. |
---|
| 820 | |
---|
| 821 | ///The type of the map that stores the edge lengths. |
---|
| 822 | ///It must meet the \ref concept::ReadMap "ReadMap" concept. |
---|
| 823 | typedef LM LengthMap; |
---|
| 824 | //The type of the length of the edges. |
---|
| 825 | typedef typename LM::Value Value; |
---|
| 826 | ///The heap type used by Dijkstra algorithm. |
---|
| 827 | |
---|
[1721] | 828 | /// The cross reference type used by heap. |
---|
| 829 | |
---|
| 830 | /// The cross reference type used by heap. |
---|
| 831 | /// Usually it is \c Graph::NodeMap<int>. |
---|
| 832 | typedef typename Graph::template NodeMap<int> HeapCrossRef; |
---|
| 833 | ///Instantiates a HeapCrossRef. |
---|
| 834 | |
---|
| 835 | ///This function instantiates a \ref HeapCrossRef. |
---|
| 836 | /// \param G is the graph, to which we would like to define the |
---|
| 837 | /// HeapCrossRef. |
---|
| 838 | /// \todo The graph alone may be insufficient for the initialization |
---|
| 839 | static HeapCrossRef *createHeapCrossRef(const GR &G) |
---|
| 840 | { |
---|
| 841 | return new HeapCrossRef(G); |
---|
| 842 | } |
---|
| 843 | |
---|
| 844 | ///The heap type used by Dijkstra algorithm. |
---|
| 845 | |
---|
[1218] | 846 | ///The heap type used by Dijkstra algorithm. |
---|
| 847 | /// |
---|
| 848 | ///\sa BinHeap |
---|
| 849 | ///\sa Dijkstra |
---|
[1721] | 850 | typedef BinHeap<typename Graph::Node, typename LM::Value, |
---|
[1218] | 851 | typename GR::template NodeMap<int>, |
---|
| 852 | std::less<Value> > Heap; |
---|
| 853 | |
---|
[1721] | 854 | static Heap *createHeap(HeapCrossRef& R) |
---|
| 855 | { |
---|
| 856 | return new Heap(R); |
---|
| 857 | } |
---|
| 858 | |
---|
[1218] | 859 | ///\brief The type of the map that stores the last |
---|
| 860 | ///edges of the shortest paths. |
---|
| 861 | /// |
---|
| 862 | ///The type of the map that stores the last |
---|
| 863 | ///edges of the shortest paths. |
---|
| 864 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
---|
| 865 | /// |
---|
| 866 | typedef NullMap <typename GR::Node,typename GR::Edge> PredMap; |
---|
| 867 | ///Instantiates a PredMap. |
---|
| 868 | |
---|
| 869 | ///This function instantiates a \ref PredMap. |
---|
[1536] | 870 | ///\param g is the graph, to which we would like to define the PredMap. |
---|
[1218] | 871 | ///\todo The graph alone may be insufficient for the initialization |
---|
[1536] | 872 | #ifdef DOXYGEN |
---|
| 873 | static PredMap *createPredMap(const GR &g) |
---|
| 874 | #else |
---|
[1367] | 875 | static PredMap *createPredMap(const GR &) |
---|
[1536] | 876 | #endif |
---|
[1218] | 877 | { |
---|
| 878 | return new PredMap(); |
---|
| 879 | } |
---|
| 880 | ///The type of the map that stores whether a nodes is processed. |
---|
| 881 | |
---|
| 882 | ///The type of the map that stores whether a nodes is processed. |
---|
| 883 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
---|
| 884 | ///By default it is a NullMap. |
---|
| 885 | ///\todo If it is set to a real map, |
---|
| 886 | ///Dijkstra::processed() should read this. |
---|
| 887 | ///\todo named parameter to set this type, function to read and write. |
---|
| 888 | typedef NullMap<typename Graph::Node,bool> ProcessedMap; |
---|
| 889 | ///Instantiates a ProcessedMap. |
---|
| 890 | |
---|
| 891 | ///This function instantiates a \ref ProcessedMap. |
---|
[1536] | 892 | ///\param g is the graph, to which |
---|
[1218] | 893 | ///we would like to define the \ref ProcessedMap |
---|
[1536] | 894 | #ifdef DOXYGEN |
---|
| 895 | static ProcessedMap *createProcessedMap(const GR &g) |
---|
| 896 | #else |
---|
[1367] | 897 | static ProcessedMap *createProcessedMap(const GR &) |
---|
[1536] | 898 | #endif |
---|
[1218] | 899 | { |
---|
| 900 | return new ProcessedMap(); |
---|
| 901 | } |
---|
| 902 | ///The type of the map that stores the dists of the nodes. |
---|
| 903 | |
---|
| 904 | ///The type of the map that stores the dists of the nodes. |
---|
| 905 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
---|
| 906 | /// |
---|
| 907 | typedef NullMap<typename Graph::Node,typename LM::Value> DistMap; |
---|
| 908 | ///Instantiates a DistMap. |
---|
| 909 | |
---|
| 910 | ///This function instantiates a \ref DistMap. |
---|
[1536] | 911 | ///\param g is the graph, to which we would like to define the \ref DistMap |
---|
| 912 | #ifdef DOXYGEN |
---|
| 913 | static DistMap *createDistMap(const GR &g) |
---|
| 914 | #else |
---|
[1367] | 915 | static DistMap *createDistMap(const GR &) |
---|
[1536] | 916 | #endif |
---|
[1218] | 917 | { |
---|
| 918 | return new DistMap(); |
---|
| 919 | } |
---|
| 920 | }; |
---|
| 921 | |
---|
[1123] | 922 | /// Default traits used by \ref DijkstraWizard |
---|
| 923 | |
---|
[1151] | 924 | /// To make it easier to use Dijkstra algorithm |
---|
| 925 | ///we have created a wizard class. |
---|
| 926 | /// This \ref DijkstraWizard class needs default traits, |
---|
| 927 | ///as well as the \ref Dijkstra class. |
---|
[1123] | 928 | /// The \ref DijkstraWizardBase is a class to be the default traits of the |
---|
| 929 | /// \ref DijkstraWizard class. |
---|
[1220] | 930 | /// \todo More named parameters are required... |
---|
[1116] | 931 | template<class GR,class LM> |
---|
[1218] | 932 | class DijkstraWizardBase : public DijkstraWizardDefaultTraits<GR,LM> |
---|
[1116] | 933 | { |
---|
| 934 | |
---|
[1218] | 935 | typedef DijkstraWizardDefaultTraits<GR,LM> Base; |
---|
[1116] | 936 | protected: |
---|
[1201] | 937 | /// Type of the nodes in the graph. |
---|
| 938 | typedef typename Base::Graph::Node Node; |
---|
| 939 | |
---|
[1116] | 940 | /// Pointer to the underlying graph. |
---|
| 941 | void *_g; |
---|
| 942 | /// Pointer to the length map |
---|
| 943 | void *_length; |
---|
| 944 | ///Pointer to the map of predecessors edges. |
---|
| 945 | void *_pred; |
---|
| 946 | ///Pointer to the map of distances. |
---|
| 947 | void *_dist; |
---|
| 948 | ///Pointer to the source node. |
---|
[1201] | 949 | Node _source; |
---|
[1116] | 950 | |
---|
| 951 | public: |
---|
[1123] | 952 | /// Constructor. |
---|
| 953 | |
---|
| 954 | /// This constructor does not require parameters, therefore it initiates |
---|
| 955 | /// all of the attributes to default values (0, INVALID). |
---|
[1218] | 956 | DijkstraWizardBase() : _g(0), _length(0), _pred(0), |
---|
| 957 | _dist(0), _source(INVALID) {} |
---|
[1116] | 958 | |
---|
[1123] | 959 | /// Constructor. |
---|
| 960 | |
---|
[1156] | 961 | /// This constructor requires some parameters, |
---|
| 962 | /// listed in the parameters list. |
---|
[1123] | 963 | /// Others are initiated to 0. |
---|
| 964 | /// \param g is the initial value of \ref _g |
---|
| 965 | /// \param l is the initial value of \ref _length |
---|
| 966 | /// \param s is the initial value of \ref _source |
---|
[1116] | 967 | DijkstraWizardBase(const GR &g,const LM &l, Node s=INVALID) : |
---|
[1218] | 968 | _g((void *)&g), _length((void *)&l), _pred(0), |
---|
| 969 | _dist(0), _source(s) {} |
---|
[1116] | 970 | |
---|
| 971 | }; |
---|
| 972 | |
---|
[1229] | 973 | /// A class to make the usage of Dijkstra algorithm easier |
---|
[953] | 974 | |
---|
[1123] | 975 | /// This class is created to make it easier to use Dijkstra algorithm. |
---|
| 976 | /// It uses the functions and features of the plain \ref Dijkstra, |
---|
[1151] | 977 | /// but it is much simpler to use it. |
---|
[953] | 978 | /// |
---|
[1123] | 979 | /// Simplicity means that the way to change the types defined |
---|
| 980 | /// in the traits class is based on functions that returns the new class |
---|
[1151] | 981 | /// and not on templatable built-in classes. |
---|
| 982 | /// When using the plain \ref Dijkstra |
---|
| 983 | /// the new class with the modified type comes from |
---|
| 984 | /// the original class by using the :: |
---|
| 985 | /// operator. In the case of \ref DijkstraWizard only |
---|
| 986 | /// a function have to be called and it will |
---|
[1123] | 987 | /// return the needed class. |
---|
| 988 | /// |
---|
| 989 | /// It does not have own \ref run method. When its \ref run method is called |
---|
[1721] | 990 | /// it initiates a plain \ref Dijkstra class, and calls the \ref |
---|
| 991 | /// Dijkstra::run method of it. |
---|
[953] | 992 | template<class TR> |
---|
[1116] | 993 | class DijkstraWizard : public TR |
---|
[953] | 994 | { |
---|
[1116] | 995 | typedef TR Base; |
---|
[953] | 996 | |
---|
[1123] | 997 | ///The type of the underlying graph. |
---|
[953] | 998 | typedef typename TR::Graph Graph; |
---|
[1119] | 999 | //\e |
---|
[953] | 1000 | typedef typename Graph::Node Node; |
---|
[1119] | 1001 | //\e |
---|
[953] | 1002 | typedef typename Graph::NodeIt NodeIt; |
---|
[1119] | 1003 | //\e |
---|
[953] | 1004 | typedef typename Graph::Edge Edge; |
---|
[1119] | 1005 | //\e |
---|
[953] | 1006 | typedef typename Graph::OutEdgeIt OutEdgeIt; |
---|
| 1007 | |
---|
[1123] | 1008 | ///The type of the map that stores the edge lengths. |
---|
[953] | 1009 | typedef typename TR::LengthMap LengthMap; |
---|
[1123] | 1010 | ///The type of the length of the edges. |
---|
[987] | 1011 | typedef typename LengthMap::Value Value; |
---|
[1123] | 1012 | ///\brief The type of the map that stores the last |
---|
| 1013 | ///edges of the shortest paths. |
---|
[953] | 1014 | typedef typename TR::PredMap PredMap; |
---|
[1123] | 1015 | ///The type of the map that stores the dists of the nodes. |
---|
[953] | 1016 | typedef typename TR::DistMap DistMap; |
---|
[1123] | 1017 | ///The heap type used by the dijkstra algorithm. |
---|
[953] | 1018 | typedef typename TR::Heap Heap; |
---|
[1116] | 1019 | public: |
---|
[1123] | 1020 | /// Constructor. |
---|
[1116] | 1021 | DijkstraWizard() : TR() {} |
---|
[953] | 1022 | |
---|
[1123] | 1023 | /// Constructor that requires parameters. |
---|
[1124] | 1024 | |
---|
| 1025 | /// Constructor that requires parameters. |
---|
[1123] | 1026 | /// These parameters will be the default values for the traits class. |
---|
[1116] | 1027 | DijkstraWizard(const Graph &g,const LengthMap &l, Node s=INVALID) : |
---|
| 1028 | TR(g,l,s) {} |
---|
[953] | 1029 | |
---|
[1123] | 1030 | ///Copy constructor |
---|
[1116] | 1031 | DijkstraWizard(const TR &b) : TR(b) {} |
---|
[953] | 1032 | |
---|
[1116] | 1033 | ~DijkstraWizard() {} |
---|
| 1034 | |
---|
[1123] | 1035 | ///Runs Dijkstra algorithm from a given node. |
---|
| 1036 | |
---|
| 1037 | ///Runs Dijkstra algorithm from a given node. |
---|
| 1038 | ///The node can be given by the \ref source function. |
---|
[1116] | 1039 | void run() |
---|
[953] | 1040 | { |
---|
[1201] | 1041 | if(Base::_source==INVALID) throw UninitializedParameter(); |
---|
[1193] | 1042 | Dijkstra<Graph,LengthMap,TR> |
---|
[1345] | 1043 | dij(*(Graph*)Base::_g,*(LengthMap*)Base::_length); |
---|
| 1044 | if(Base::_pred) dij.predMap(*(PredMap*)Base::_pred); |
---|
| 1045 | if(Base::_dist) dij.distMap(*(DistMap*)Base::_dist); |
---|
| 1046 | dij.run(Base::_source); |
---|
[1116] | 1047 | } |
---|
| 1048 | |
---|
[1124] | 1049 | ///Runs Dijkstra algorithm from the given node. |
---|
[1123] | 1050 | |
---|
[1124] | 1051 | ///Runs Dijkstra algorithm from the given node. |
---|
[1123] | 1052 | ///\param s is the given source. |
---|
[1116] | 1053 | void run(Node s) |
---|
| 1054 | { |
---|
[1201] | 1055 | Base::_source=s; |
---|
[1116] | 1056 | run(); |
---|
[953] | 1057 | } |
---|
| 1058 | |
---|
| 1059 | template<class T> |
---|
[1116] | 1060 | struct DefPredMapBase : public Base { |
---|
| 1061 | typedef T PredMap; |
---|
[1367] | 1062 | static PredMap *createPredMap(const Graph &) { return 0; }; |
---|
[1236] | 1063 | DefPredMapBase(const TR &b) : TR(b) {} |
---|
[1116] | 1064 | }; |
---|
[953] | 1065 | |
---|
[1156] | 1066 | ///\brief \ref named-templ-param "Named parameter" |
---|
| 1067 | ///function for setting PredMap type |
---|
| 1068 | /// |
---|
| 1069 | /// \ref named-templ-param "Named parameter" |
---|
| 1070 | ///function for setting PredMap type |
---|
[1124] | 1071 | /// |
---|
[953] | 1072 | template<class T> |
---|
[1116] | 1073 | DijkstraWizard<DefPredMapBase<T> > predMap(const T &t) |
---|
[953] | 1074 | { |
---|
[1193] | 1075 | Base::_pred=(void *)&t; |
---|
[1116] | 1076 | return DijkstraWizard<DefPredMapBase<T> >(*this); |
---|
[953] | 1077 | } |
---|
| 1078 | |
---|
[1116] | 1079 | template<class T> |
---|
| 1080 | struct DefDistMapBase : public Base { |
---|
| 1081 | typedef T DistMap; |
---|
[1367] | 1082 | static DistMap *createDistMap(const Graph &) { return 0; }; |
---|
[1236] | 1083 | DefDistMapBase(const TR &b) : TR(b) {} |
---|
[1116] | 1084 | }; |
---|
[953] | 1085 | |
---|
[1156] | 1086 | ///\brief \ref named-templ-param "Named parameter" |
---|
| 1087 | ///function for setting DistMap type |
---|
| 1088 | /// |
---|
| 1089 | /// \ref named-templ-param "Named parameter" |
---|
| 1090 | ///function for setting DistMap type |
---|
[1124] | 1091 | /// |
---|
[953] | 1092 | template<class T> |
---|
[1116] | 1093 | DijkstraWizard<DefDistMapBase<T> > distMap(const T &t) |
---|
[953] | 1094 | { |
---|
[1193] | 1095 | Base::_dist=(void *)&t; |
---|
[1116] | 1096 | return DijkstraWizard<DefDistMapBase<T> >(*this); |
---|
[953] | 1097 | } |
---|
[1117] | 1098 | |
---|
[1123] | 1099 | /// Sets the source node, from which the Dijkstra algorithm runs. |
---|
| 1100 | |
---|
| 1101 | /// Sets the source node, from which the Dijkstra algorithm runs. |
---|
| 1102 | /// \param s is the source node. |
---|
[1117] | 1103 | DijkstraWizard<TR> &source(Node s) |
---|
[953] | 1104 | { |
---|
[1201] | 1105 | Base::_source=s; |
---|
[953] | 1106 | return *this; |
---|
| 1107 | } |
---|
| 1108 | |
---|
| 1109 | }; |
---|
[255] | 1110 | |
---|
[1218] | 1111 | ///Function type interface for Dijkstra algorithm. |
---|
[953] | 1112 | |
---|
[1151] | 1113 | /// \ingroup flowalgs |
---|
[1218] | 1114 | ///Function type interface for Dijkstra algorithm. |
---|
[953] | 1115 | /// |
---|
[1218] | 1116 | ///This function also has several |
---|
| 1117 | ///\ref named-templ-func-param "named parameters", |
---|
| 1118 | ///they are declared as the members of class \ref DijkstraWizard. |
---|
| 1119 | ///The following |
---|
| 1120 | ///example shows how to use these parameters. |
---|
| 1121 | ///\code |
---|
| 1122 | /// dijkstra(g,length,source).predMap(preds).run(); |
---|
| 1123 | ///\endcode |
---|
| 1124 | ///\warning Don't forget to put the \ref DijkstraWizard::run() "run()" |
---|
| 1125 | ///to the end of the parameter list. |
---|
| 1126 | ///\sa DijkstraWizard |
---|
| 1127 | ///\sa Dijkstra |
---|
[953] | 1128 | template<class GR, class LM> |
---|
[1116] | 1129 | DijkstraWizard<DijkstraWizardBase<GR,LM> > |
---|
| 1130 | dijkstra(const GR &g,const LM &l,typename GR::Node s=INVALID) |
---|
[953] | 1131 | { |
---|
[1116] | 1132 | return DijkstraWizard<DijkstraWizardBase<GR,LM> >(g,l,s); |
---|
[953] | 1133 | } |
---|
| 1134 | |
---|
[921] | 1135 | } //END OF NAMESPACE LEMON |
---|
[255] | 1136 | |
---|
| 1137 | #endif |
---|