1 | /* -*- C++ -*- |
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2 | * lemon/concept/graph.h - Part of LEMON, a generic C++ optimization library |
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3 | * |
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4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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5 | * (Egervary Research Group on Combinatorial Optimization, 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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17 | #ifndef LEMON_CONCEPT_GRAPH_H |
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18 | #define LEMON_CONCEPT_GRAPH_H |
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19 | |
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20 | ///\ingroup graph_concepts |
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21 | ///\file |
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22 | ///\brief Declaration of Graph. |
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23 | |
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24 | #include <lemon/invalid.h> |
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25 | #include <lemon/concept/maps.h> |
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26 | #include <lemon/concept_check.h> |
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27 | #include <lemon/concept/graph_component.h> |
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28 | |
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29 | namespace lemon { |
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30 | namespace concept { |
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31 | |
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32 | |
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33 | /// \addtogroup graph_concepts |
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34 | /// @{ |
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35 | |
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36 | /**************** The full-featured graph concepts ****************/ |
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37 | |
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38 | |
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39 | /// \brief Modular static graph class. |
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40 | /// |
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41 | /// It should be the same as the \c StaticGraph class. |
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42 | class _StaticGraph |
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43 | : virtual public BaseGraphComponent, |
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44 | public IterableGraphComponent, public MappableGraphComponent { |
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45 | public: |
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46 | typedef BaseGraphComponent::Node Node; |
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47 | typedef BaseGraphComponent::Edge Edge; |
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48 | |
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49 | template <typename _Graph> |
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50 | struct Constraints { |
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51 | void constraints() { |
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52 | checkConcept<IterableGraphComponent, _Graph>(); |
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53 | checkConcept<MappableGraphComponent, _Graph>(); |
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54 | } |
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55 | }; |
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56 | }; |
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57 | |
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58 | /// \brief Modular extendable graph class. |
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59 | /// |
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60 | /// It should be the same as the \c ExtendableGraph class. |
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61 | class _ExtendableGraph |
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62 | : virtual public BaseGraphComponent, public _StaticGraph, |
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63 | public ExtendableGraphComponent, public ClearableGraphComponent { |
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64 | public: |
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65 | typedef BaseGraphComponent::Node Node; |
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66 | typedef BaseGraphComponent::Edge Edge; |
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67 | |
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68 | template <typename _Graph> |
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69 | struct Constraints { |
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70 | void constraints() { |
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71 | checkConcept<_StaticGraph, _Graph >(); |
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72 | checkConcept<ExtendableGraphComponent, _Graph >(); |
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73 | checkConcept<ClearableGraphComponent, _Graph >(); |
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74 | } |
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75 | }; |
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76 | }; |
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77 | |
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78 | /// \brief Modular erasable graph class. |
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79 | /// |
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80 | /// It should be the same as the \c ErasableGraph class. |
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81 | class _ErasableGraph |
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82 | : virtual public BaseGraphComponent, public _ExtendableGraph, |
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83 | public ErasableGraphComponent { |
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84 | public: |
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85 | typedef BaseGraphComponent::Node Node; |
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86 | typedef BaseGraphComponent::Edge Edge; |
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87 | |
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88 | template <typename _Graph> |
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89 | struct Constraints { |
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90 | void constraints() { |
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91 | checkConcept<_ExtendableGraph, _Graph >(); |
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92 | checkConcept<ErasableGraphComponent, _Graph >(); |
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93 | } |
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94 | }; |
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95 | }; |
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96 | |
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97 | /// An empty static graph class. |
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98 | |
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99 | /// This class provides all the common features of a graph structure, |
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100 | /// however completely without implementations and real data structures |
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101 | /// behind the interface. |
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102 | /// All graph algorithms should compile with this class, but it will not |
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103 | /// run properly, of course. |
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104 | /// |
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105 | /// It can be used for checking the interface compatibility, |
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106 | /// or it can serve as a skeleton of a new graph structure. |
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107 | /// |
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108 | /// Also, you will find here the full documentation of a certain graph |
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109 | /// feature, the documentation of a real graph imlementation |
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110 | /// like @ref ListGraph or |
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111 | /// @ref SmartGraph will just refer to this structure. |
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112 | /// |
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113 | /// \todo A pages describing the concept of concept description would |
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114 | /// be nice. |
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115 | class StaticGraph |
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116 | { |
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117 | public: |
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118 | /// Defalult constructor. |
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119 | |
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120 | /// Defalult constructor. |
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121 | /// |
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122 | StaticGraph() { } |
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123 | ///Copy consructor. |
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124 | |
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125 | // ///\todo It is not clear, what we expect from a copy constructor. |
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126 | // ///E.g. How to assign the nodes/edges to each other? What about maps? |
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127 | // StaticGraph(const StaticGraph& g) { } |
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128 | |
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129 | /// The base type of node iterators, |
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130 | /// or in other words, the trivial node iterator. |
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131 | |
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132 | /// This is the base type of each node iterator, |
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133 | /// thus each kind of node iterator converts to this. |
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134 | /// More precisely each kind of node iterator should be inherited |
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135 | /// from the trivial node iterator. |
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136 | class Node { |
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137 | public: |
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138 | /// Default constructor |
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139 | |
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140 | /// @warning The default constructor sets the iterator |
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141 | /// to an undefined value. |
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142 | Node() { } |
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143 | /// Copy constructor. |
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144 | |
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145 | /// Copy constructor. |
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146 | /// |
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147 | Node(const Node&) { } |
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148 | |
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149 | /// Invalid constructor \& conversion. |
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150 | |
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151 | /// This constructor initializes the iterator to be invalid. |
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152 | /// \sa Invalid for more details. |
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153 | Node(Invalid) { } |
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154 | /// Equality operator |
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155 | |
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156 | /// Two iterators are equal if and only if they point to the |
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157 | /// same object or both are invalid. |
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158 | bool operator==(Node) const { return true; } |
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159 | |
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160 | /// Inequality operator |
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161 | |
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162 | /// \sa operator==(Node n) |
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163 | /// |
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164 | bool operator!=(Node) const { return true; } |
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165 | |
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166 | }; |
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167 | |
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168 | /// This iterator goes through each node. |
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169 | |
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170 | /// This iterator goes through each node. |
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171 | /// Its usage is quite simple, for example you can count the number |
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172 | /// of nodes in graph \c g of type \c Graph like this: |
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173 | /// \code |
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174 | /// int count=0; |
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175 | /// for (Graph::NodeIt n(g); n!=INVALID; ++n) ++count; |
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176 | /// \endcode |
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177 | class NodeIt : public Node { |
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178 | public: |
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179 | /// Default constructor |
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180 | |
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181 | /// @warning The default constructor sets the iterator |
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182 | /// to an undefined value. |
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183 | NodeIt() { } |
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184 | /// Copy constructor. |
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185 | |
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186 | /// Copy constructor. |
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187 | /// |
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188 | NodeIt(const NodeIt& n) : Node(n) { } |
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189 | /// Invalid constructor \& conversion. |
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190 | |
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191 | /// Initialize the iterator to be invalid. |
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192 | /// \sa Invalid for more details. |
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193 | NodeIt(Invalid) { } |
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194 | /// Sets the iterator to the first node. |
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195 | |
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196 | /// Sets the iterator to the first node of \c g. |
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197 | /// |
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198 | NodeIt(const StaticGraph&) { } |
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199 | /// Node -> NodeIt conversion. |
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200 | |
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201 | /// Sets the iterator to the node of \c g pointed by the trivial |
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202 | /// iterator n. |
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203 | /// This feature necessitates that each time we |
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204 | /// iterate the edge-set, the iteration order is the same. |
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205 | NodeIt(const StaticGraph& g, const Node& n) { } |
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206 | /// Next node. |
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207 | |
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208 | /// Assign the iterator to the next node. |
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209 | /// |
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210 | NodeIt& operator++() { return *this; } |
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211 | }; |
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212 | |
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213 | |
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214 | /// The base type of the edge iterators. |
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215 | |
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216 | /// The base type of the edge iterators. |
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217 | /// |
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218 | class Edge { |
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219 | public: |
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220 | /// Default constructor |
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221 | |
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222 | /// @warning The default constructor sets the iterator |
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223 | /// to an undefined value. |
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224 | Edge() { } |
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225 | /// Copy constructor. |
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226 | |
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227 | /// Copy constructor. |
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228 | /// |
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229 | Edge(const Edge&) { } |
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230 | /// Initialize the iterator to be invalid. |
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231 | |
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232 | /// Initialize the iterator to be invalid. |
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233 | /// |
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234 | Edge(Invalid) { } |
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235 | /// Equality operator |
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236 | |
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237 | /// Two iterators are equal if and only if they point to the |
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238 | /// same object or both are invalid. |
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239 | bool operator==(Edge) const { return true; } |
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240 | /// Inequality operator |
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241 | |
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242 | /// \sa operator==(Node n) |
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243 | /// |
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244 | bool operator!=(Edge) const { return true; } |
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245 | }; |
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246 | |
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247 | /// This iterator goes trough the outgoing edges of a node. |
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248 | |
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249 | /// This iterator goes trough the \e outgoing edges of a certain node |
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250 | /// of a graph. |
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251 | /// Its usage is quite simple, for example you can count the number |
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252 | /// of outgoing edges of a node \c n |
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253 | /// in graph \c g of type \c Graph as follows. |
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254 | /// \code |
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255 | /// int count=0; |
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256 | /// for (Graph::OutEdgeIt e(g, n); e!=INVALID; ++e) ++count; |
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257 | /// \endcode |
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258 | |
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259 | class OutEdgeIt : public Edge { |
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260 | public: |
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261 | /// Default constructor |
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262 | |
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263 | /// @warning The default constructor sets the iterator |
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264 | /// to an undefined value. |
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265 | OutEdgeIt() { } |
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266 | /// Copy constructor. |
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267 | |
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268 | /// Copy constructor. |
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269 | /// |
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270 | OutEdgeIt(const OutEdgeIt& e) : Edge(e) { } |
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271 | /// Initialize the iterator to be invalid. |
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272 | |
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273 | /// Initialize the iterator to be invalid. |
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274 | /// |
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275 | OutEdgeIt(Invalid) { } |
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276 | /// This constructor sets the iterator to the first outgoing edge. |
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277 | |
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278 | /// This constructor sets the iterator to the first outgoing edge of |
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279 | /// the node. |
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280 | ///@param n the node |
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281 | ///@param g the graph |
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282 | OutEdgeIt(const StaticGraph&, const Node&) { } |
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283 | /// Edge -> OutEdgeIt conversion |
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284 | |
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285 | /// Sets the iterator to the value of the trivial iterator \c e. |
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286 | /// This feature necessitates that each time we |
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287 | /// iterate the edge-set, the iteration order is the same. |
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288 | OutEdgeIt(const StaticGraph& g, const Edge& e) { } |
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289 | ///Next outgoing edge |
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290 | |
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291 | /// Assign the iterator to the next |
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292 | /// outgoing edge of the corresponding node. |
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293 | OutEdgeIt& operator++() { return *this; } |
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294 | }; |
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295 | |
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296 | /// This iterator goes trough the incoming edges of a node. |
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297 | |
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298 | /// This iterator goes trough the \e incoming edges of a certain node |
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299 | /// of a graph. |
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300 | /// Its usage is quite simple, for example you can count the number |
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301 | /// of outgoing edges of a node \c n |
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302 | /// in graph \c g of type \c Graph as follows. |
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303 | /// \code |
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304 | /// int count=0; |
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305 | /// for(Graph::InEdgeIt e(g, n); e!=INVALID; ++e) ++count; |
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306 | /// \endcode |
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307 | |
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308 | class InEdgeIt : public Edge { |
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309 | public: |
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310 | /// Default constructor |
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311 | |
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312 | /// @warning The default constructor sets the iterator |
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313 | /// to an undefined value. |
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314 | InEdgeIt() { } |
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315 | /// Copy constructor. |
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316 | |
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317 | /// Copy constructor. |
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318 | /// |
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319 | InEdgeIt(const InEdgeIt& e) : Edge(e) { } |
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320 | /// Initialize the iterator to be invalid. |
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321 | |
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322 | /// Initialize the iterator to be invalid. |
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323 | /// |
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324 | InEdgeIt(Invalid) { } |
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325 | /// This constructor sets the iterator to first incoming edge. |
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326 | |
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327 | /// This constructor set the iterator to the first incoming edge of |
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328 | /// the node. |
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329 | ///@param n the node |
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330 | ///@param g the graph |
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331 | InEdgeIt(const StaticGraph&, const Node&) { } |
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332 | /// Edge -> InEdgeIt conversion |
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333 | |
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334 | /// Sets the iterator to the value of the trivial iterator \c e. |
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335 | /// This feature necessitates that each time we |
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336 | /// iterate the edge-set, the iteration order is the same. |
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337 | InEdgeIt(const StaticGraph&, const Edge&) { } |
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338 | /// Next incoming edge |
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339 | |
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340 | /// Assign the iterator to the next inedge of the corresponding node. |
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341 | /// |
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342 | InEdgeIt& operator++() { return *this; } |
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343 | }; |
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344 | /// This iterator goes through each edge. |
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345 | |
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346 | /// This iterator goes through each edge of a graph. |
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347 | /// Its usage is quite simple, for example you can count the number |
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348 | /// of edges in a graph \c g of type \c Graph as follows: |
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349 | /// \code |
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350 | /// int count=0; |
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351 | /// for(Graph::EdgeIt e(g); e!=INVALID; ++e) ++count; |
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352 | /// \endcode |
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353 | class EdgeIt : public Edge { |
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354 | public: |
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355 | /// Default constructor |
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356 | |
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357 | /// @warning The default constructor sets the iterator |
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358 | /// to an undefined value. |
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359 | EdgeIt() { } |
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360 | /// Copy constructor. |
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361 | |
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362 | /// Copy constructor. |
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363 | /// |
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364 | EdgeIt(const EdgeIt& e) : Edge(e) { } |
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365 | /// Initialize the iterator to be invalid. |
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366 | |
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367 | /// Initialize the iterator to be invalid. |
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368 | /// |
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369 | EdgeIt(Invalid) { } |
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370 | /// This constructor sets the iterator to the first edge. |
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371 | |
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372 | /// This constructor sets the iterator to the first edge of \c g. |
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373 | ///@param g the graph |
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374 | EdgeIt(const StaticGraph&) { } |
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375 | /// Edge -> EdgeIt conversion |
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376 | |
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377 | /// Sets the iterator to the value of the trivial iterator \c e. |
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378 | /// This feature necessitates that each time we |
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379 | /// iterate the edge-set, the iteration order is the same. |
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380 | EdgeIt(const StaticGraph&, const Edge&) { } |
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381 | ///Next edge |
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382 | |
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383 | /// Assign the iterator to the next edge. |
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384 | EdgeIt& operator++() { return *this; } |
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385 | }; |
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386 | ///Gives back the target node of an edge. |
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387 | |
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388 | ///Gives back the target node of an edge. |
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389 | /// |
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390 | Node target(Edge) const { return INVALID; } |
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391 | ///Gives back the source node of an edge. |
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392 | |
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393 | ///Gives back the source node of an edge. |
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394 | /// |
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395 | Node source(Edge) const { return INVALID; } |
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396 | /// Read write map of the nodes to type \c T. |
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397 | |
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398 | /// \ingroup concept |
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399 | /// ReadWrite map of the nodes to type \c T. |
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400 | /// \sa Reference |
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401 | /// \warning Making maps that can handle bool type (NodeMap<bool>) |
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402 | /// needs some extra attention! |
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403 | template<class T> |
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404 | class NodeMap : public ReadWriteMap< Node, T > |
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405 | { |
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406 | public: |
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407 | |
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408 | ///\e |
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409 | NodeMap(const StaticGraph&) { } |
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410 | ///\e |
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411 | NodeMap(const StaticGraph&, T) { } |
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412 | |
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413 | ///Copy constructor |
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414 | NodeMap(const NodeMap& nm) : ReadWriteMap< Node, T >(nm) { } |
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415 | ///Assignment operator |
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416 | NodeMap& operator=(const NodeMap&) { return *this; } |
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417 | // \todo fix this concept |
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418 | }; |
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419 | |
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420 | /// Read write map of the edges to type \c T. |
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421 | |
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422 | /// \ingroup concept |
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423 | ///Reference map of the edges to type \c T. |
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424 | /// \sa Reference |
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425 | /// \warning Making maps that can handle bool type (EdgeMap<bool>) |
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426 | /// needs some extra attention! |
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427 | template<class T> |
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428 | class EdgeMap : public ReadWriteMap<Edge,T> |
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429 | { |
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430 | public: |
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431 | |
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432 | ///\e |
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433 | EdgeMap(const StaticGraph&) { } |
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434 | ///\e |
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435 | EdgeMap(const StaticGraph&, T) { } |
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436 | ///Copy constructor |
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437 | EdgeMap(const EdgeMap& em) : ReadWriteMap<Edge,T>(em) { } |
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438 | ///Assignment operator |
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439 | EdgeMap& operator=(const EdgeMap&) { return *this; } |
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440 | // \todo fix this concept |
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441 | }; |
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442 | |
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443 | template <typename _Graph> |
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444 | struct Constraints : public _StaticGraph::Constraints<_Graph> {}; |
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445 | |
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446 | }; |
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447 | |
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448 | /// An empty non-static graph class. |
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449 | |
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450 | /// This class provides everything that \ref StaticGraph does. |
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451 | /// Additionally it enables building graphs from scratch. |
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452 | class ExtendableGraph : public StaticGraph |
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453 | { |
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454 | public: |
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455 | /// Defalult constructor. |
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456 | |
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457 | /// Defalult constructor. |
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458 | /// |
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459 | ExtendableGraph() { } |
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460 | ///Add a new node to the graph. |
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461 | |
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462 | /// \return the new node. |
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463 | /// |
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464 | Node addNode() { return INVALID; } |
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465 | ///Add a new edge to the graph. |
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466 | |
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467 | ///Add a new edge to the graph with source node \c s |
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468 | ///and target node \c t. |
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469 | ///\return the new edge. |
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470 | Edge addEdge(Node, Node) { return INVALID; } |
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471 | |
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472 | /// Resets the graph. |
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473 | |
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474 | /// This function deletes all edges and nodes of the graph. |
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475 | /// It also frees the memory allocated to store them. |
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476 | /// \todo It might belong to \ref ErasableGraph. |
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477 | void clear() { } |
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478 | |
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479 | template <typename _Graph> |
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480 | struct Constraints : public _ExtendableGraph::Constraints<_Graph> {}; |
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481 | |
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482 | }; |
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483 | |
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484 | /// An empty erasable graph class. |
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485 | |
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486 | /// This class is an extension of \ref ExtendableGraph. It makes it |
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487 | /// possible to erase edges or nodes. |
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488 | class ErasableGraph : public ExtendableGraph |
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489 | { |
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490 | public: |
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491 | /// Defalult constructor. |
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492 | |
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493 | /// Defalult constructor. |
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494 | /// |
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495 | ErasableGraph() { } |
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496 | /// Deletes a node. |
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497 | |
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498 | /// Deletes node \c n node. |
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499 | /// |
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500 | void erase(Node) { } |
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501 | /// Deletes an edge. |
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502 | |
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503 | /// Deletes edge \c e edge. |
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504 | /// |
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505 | void erase(Edge) { } |
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506 | |
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507 | template <typename _Graph> |
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508 | struct Constraints : public _ErasableGraph::Constraints<_Graph> {}; |
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509 | |
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510 | }; |
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511 | |
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512 | |
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513 | /************* New GraphBase stuff **************/ |
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514 | |
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515 | |
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516 | // /// A minimal GraphBase concept |
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517 | |
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518 | // /// This class describes a minimal concept which can be extended to a |
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519 | // /// full-featured graph with \ref GraphFactory. |
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520 | // class GraphBase { |
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521 | // public: |
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522 | |
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523 | // GraphBase() {} |
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524 | |
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525 | // /// \bug Should we demand that Node and Edge be subclasses of the |
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526 | // /// Graph class??? |
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527 | |
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528 | // typedef GraphItem<'n'> Node; |
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529 | // typedef GraphItem<'e'> Edge; |
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530 | |
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531 | // // class Node : public BaseGraphItem<'n'> {}; |
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532 | // // class Edge : public BaseGraphItem<'e'> {}; |
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533 | |
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534 | // // Graph operation |
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535 | // void firstNode(Node &n) const { } |
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536 | // void firstEdge(Edge &e) const { } |
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537 | |
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538 | // void firstOutEdge(Edge &e, Node) const { } |
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539 | // void firstInEdge(Edge &e, Node) const { } |
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540 | |
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541 | // void nextNode(Node &n) const { } |
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542 | // void nextEdge(Edge &e) const { } |
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543 | |
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544 | |
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545 | // // Question: isn't it reasonable if this methods have a Node |
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546 | // // parameter? Like this: |
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547 | // // Edge& nextOut(Edge &e, Node) const { return e; } |
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548 | // void nextOutEdge(Edge &e) const { } |
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549 | // void nextInEdge(Edge &e) const { } |
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550 | |
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551 | // Node target(Edge) const { return Node(); } |
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552 | // Node source(Edge) const { return Node(); } |
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553 | |
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554 | |
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555 | // // Do we need id, nodeNum, edgeNum and co. in this basic graphbase |
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556 | // // concept? |
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557 | |
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558 | |
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559 | // // Maps. |
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560 | // // |
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561 | // // We need a special slimer concept which does not provide maps (it |
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562 | // // wouldn't be strictly slimer, cause for map-factory id() & friends |
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563 | // // a required...) |
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564 | |
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565 | // template<typename T> |
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566 | // class NodeMap : public GraphMap<GraphBase, Node, T> {}; |
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567 | |
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568 | // template<typename T> |
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569 | // class EdgeMap : public GraphMap<GraphBase, Node, T> {}; |
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570 | // }; |
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571 | |
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572 | // @} |
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573 | } //namespace concept |
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574 | } //namespace lemon |
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575 | |
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576 | |
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577 | |
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578 | #endif // LEMON_CONCEPT_GRAPH_H |
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