1 | /* -*- C++ -*- |
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2 | * src/lemon/array_map.h - Part of LEMON, a generic C++ optimization library |
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3 | * |
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4 | * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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5 | * (Egervary Combinatorial Optimization Research Group, EGRES). |
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6 | * |
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7 | * Permission to use, modify and distribute this software is granted |
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8 | * provided that this copyright notice appears in all copies. For |
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9 | * precise terms see the accompanying LICENSE file. |
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10 | * |
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11 | * This software is provided "AS IS" with no warranty of any kind, |
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12 | * express or implied, and with no claim as to its suitability for any |
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13 | * purpose. |
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14 | * |
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15 | */ |
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16 | |
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17 | #ifndef LEMON_ARRAY_MAP_H |
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18 | #define LEMON_ARRAY_MAP_H |
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19 | |
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20 | #include <memory> |
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21 | |
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22 | #include <lemon/map_iterator.h> |
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23 | |
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24 | ///\ingroup graphmaps |
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25 | ///\file |
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26 | ///\brief Graph maps that construates and destruates |
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27 | ///their elements dynamically. |
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28 | |
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29 | namespace lemon { |
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30 | |
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31 | |
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32 | /// \addtogroup graphmaps |
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33 | /// @{ |
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34 | |
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35 | /** The ArrayMap template class is graph map structure what |
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36 | * automatically updates the map when a key is added to or erased from |
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37 | * the map. This map factory uses the allocators to implement |
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38 | * the container functionality. |
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39 | * |
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40 | * The template parameter is the MapRegistry that the maps |
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41 | * will belong to and the ValueType. |
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42 | */ |
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43 | |
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44 | template <typename _Graph, |
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45 | typename _Item, |
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46 | typename _ItemIt, |
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47 | typename _IdMap, |
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48 | typename _Value> |
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49 | class ArrayMap : public AlterationObserverRegistry<_Item>::ObserverBase { |
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50 | |
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51 | public: |
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52 | |
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53 | /// The graph type of the maps. |
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54 | typedef _Graph Graph; |
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55 | /// The key type of the maps. |
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56 | typedef _Item KeyType; |
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57 | |
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58 | typedef AlterationObserverRegistry<_Item> Registry; |
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59 | |
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60 | private: |
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61 | /// The iterator to iterate on the keys. |
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62 | typedef _ItemIt KeyIt; |
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63 | |
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64 | typedef _IdMap IdMap; |
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65 | |
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66 | typedef _Value Value; |
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67 | |
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68 | /// The MapBase of the Map which imlements the core regisitry function. |
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69 | typedef typename Registry::ObserverBase Parent; |
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70 | |
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71 | |
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72 | public: |
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73 | |
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74 | /// The value type of the map. |
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75 | typedef Value ValueType; |
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76 | /// The reference type of the map; |
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77 | typedef Value& ReferenceType; |
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78 | /// The pointer type of the map; |
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79 | typedef Value* PointerType; |
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80 | |
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81 | /// The const value type of the map. |
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82 | typedef const Value ConstValueType; |
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83 | /// The const reference type of the map; |
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84 | typedef const Value& ConstReferenceType; |
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85 | /// The pointer type of the map; |
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86 | typedef const Value* ConstPointerType; |
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87 | |
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88 | |
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89 | private: |
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90 | typedef std::allocator<Value> Allocator; |
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91 | |
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92 | |
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93 | public: |
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94 | |
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95 | /** Graph and Registry initialized map constructor. |
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96 | */ |
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97 | ArrayMap(const Graph& _g, Registry& _r) : graph(&_g) { |
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98 | attach(_r); |
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99 | allocate_memory(); |
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100 | for (KeyIt it(*graph); it != INVALID; ++it) { |
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101 | int id = IdMap(*graph)[it]; |
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102 | allocator.construct(&(values[id]), Value()); |
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103 | } |
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104 | } |
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105 | |
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106 | /// Constructor to use default value to initialize the map. |
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107 | |
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108 | /// It constrates a map and initialize all of the the map. |
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109 | |
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110 | ArrayMap(const Graph& _g, Registry& _r, const Value& _v) : graph(&_g) { |
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111 | attach(_r); |
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112 | allocate_memory(); |
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113 | for (KeyIt it(*graph); it != INVALID; ++it) { |
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114 | int id = IdMap(*graph)[it]; |
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115 | allocator.construct(&(values[id]), _v); |
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116 | } |
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117 | } |
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118 | |
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119 | /** Constructor to copy a map of the same map type. |
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120 | */ |
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121 | ArrayMap(const ArrayMap& copy) { |
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122 | if (copy.attached()) { |
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123 | attach(*copy.getRegistry()); |
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124 | } |
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125 | capacity = copy.capacity; |
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126 | if (capacity == 0) return; |
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127 | values = allocator.allocate(capacity); |
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128 | for (KeyIt it(*graph); it != INVALID; ++it) { |
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129 | int id = IdMap(*graph)[it]; |
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130 | allocator.construct(&(values[id]), copy.values[id]); |
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131 | } |
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132 | } |
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133 | |
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134 | /** Assign operator to copy a map of the same map type. |
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135 | */ |
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136 | ArrayMap& operator=(const ArrayMap& copy) { |
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137 | if (© == this) return *this; |
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138 | |
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139 | if (graph != copy.graph) { |
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140 | if (attached()) { |
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141 | clear(); |
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142 | detach(); |
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143 | } |
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144 | if (copy.attached()) { |
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145 | attach(*copy.getRegistry()); |
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146 | } |
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147 | capacity = copy.capacity; |
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148 | if (capacity == 0) return *this; |
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149 | values = allocator.allocate(capacity); |
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150 | } |
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151 | |
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152 | for (KeyIt it(*graph); it != INVALID; ++it) { |
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153 | int id = IdMap(*graph)[it]; |
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154 | allocator.construct(&(values[id]), copy.values[id]); |
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155 | } |
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156 | |
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157 | return *this; |
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158 | } |
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159 | |
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160 | /** The destructor of the map. |
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161 | */ |
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162 | virtual ~ArrayMap() { |
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163 | if (attached()) { |
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164 | clear(); |
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165 | detach(); |
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166 | } |
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167 | } |
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168 | |
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169 | |
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170 | /** |
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171 | * The subscript operator. The map can be subscripted by the |
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172 | * actual keys of the graph. |
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173 | */ |
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174 | ReferenceType operator[](const KeyType& key) { |
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175 | int id = IdMap(*graph)[key]; |
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176 | return values[id]; |
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177 | } |
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178 | |
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179 | /** |
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180 | * The const subscript operator. The map can be subscripted by the |
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181 | * actual keys of the graph. |
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182 | */ |
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183 | ConstReferenceType operator[](const KeyType& key) const { |
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184 | int id = IdMap(*graph)[key]; |
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185 | return values[id]; |
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186 | } |
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187 | |
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188 | /** Setter function of the map. Equivalent with map[key] = val. |
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189 | * This is a compatibility feature with the not dereferable maps. |
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190 | */ |
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191 | void set(const KeyType& key, const ValueType& val) { |
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192 | (*this)[key] = val; |
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193 | } |
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194 | |
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195 | /** Add a new key to the map. It called by the map registry. |
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196 | */ |
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197 | void add(const KeyType& key) { |
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198 | int id = IdMap(*graph)[key]; |
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199 | if (id >= capacity) { |
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200 | int new_capacity = (capacity == 0 ? 1 : capacity); |
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201 | while (new_capacity <= id) { |
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202 | new_capacity <<= 1; |
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203 | } |
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204 | Value* new_values = allocator.allocate(new_capacity); |
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205 | for (KeyIt it(*graph); it != INVALID; ++it) { |
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206 | int jd = IdMap(*graph)[it]; |
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207 | if (id != jd) { |
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208 | allocator.construct(&(new_values[jd]), values[jd]); |
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209 | allocator.destroy(&(values[jd])); |
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210 | } |
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211 | } |
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212 | if (capacity != 0) allocator.deallocate(values, capacity); |
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213 | values = new_values; |
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214 | capacity = new_capacity; |
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215 | } |
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216 | allocator.construct(&(values[id]), Value()); |
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217 | } |
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218 | |
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219 | /** Erase a key from the map. It called by the map registry. |
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220 | */ |
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221 | void erase(const KeyType& key) { |
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222 | int id = IdMap(*graph)[key]; |
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223 | allocator.destroy(&(values[id])); |
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224 | } |
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225 | |
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226 | void build() { |
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227 | allocate_memory(); |
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228 | for (KeyIt it(*graph); it != INVALID; ++it) { |
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229 | int id = IdMap(*graph)[it]; |
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230 | allocator.construct(&(values[id]), Value()); |
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231 | } |
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232 | } |
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233 | |
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234 | void clear() { |
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235 | if (capacity != 0) { |
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236 | for (KeyIt it(*graph); it != INVALID; ++it) { |
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237 | int id = IdMap(*graph)[it]; |
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238 | allocator.destroy(&(values[id])); |
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239 | } |
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240 | allocator.deallocate(values, capacity); |
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241 | capacity = 0; |
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242 | } |
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243 | } |
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244 | |
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245 | // /// The stl compatible pair iterator of the map. |
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246 | // typedef MapIterator<ArrayMap> Iterator; |
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247 | // /// The stl compatible const pair iterator of the map. |
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248 | // typedef MapConstIterator<ArrayMap> ConstIterator; |
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249 | |
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250 | // /** Returns the begin iterator of the map. |
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251 | // */ |
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252 | // Iterator begin() { |
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253 | // return Iterator(*this, KeyIt(*MapBase::getGraph())); |
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254 | // } |
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255 | |
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256 | // /** Returns the end iterator of the map. |
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257 | // */ |
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258 | // Iterator end() { |
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259 | // return Iterator(*this, INVALID); |
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260 | // } |
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261 | |
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262 | // /** Returns the begin ConstIterator of the map. |
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263 | // */ |
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264 | // ConstIterator begin() const { |
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265 | // return ConstIterator(*this, KeyIt(*MapBase::getGraph())); |
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266 | // } |
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267 | |
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268 | // /** Returns the end const_iterator of the map. |
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269 | // */ |
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270 | // ConstIterator end() const { |
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271 | // return ConstIterator(*this, INVALID); |
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272 | // } |
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273 | |
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274 | // /// The KeySet of the Map. |
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275 | // typedef MapConstKeySet<ArrayMap> ConstKeySet; |
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276 | |
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277 | // /// KeySet getter function. |
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278 | // ConstKeySet keySet() const { |
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279 | // return ConstKeySet(*this); |
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280 | // } |
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281 | |
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282 | // /// The ConstValueSet of the Map. |
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283 | // typedef MapConstValueSet<ArrayMap> ConstValueSet; |
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284 | |
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285 | // /// ConstValueSet getter function. |
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286 | // ConstValueSet valueSet() const { |
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287 | // return ConstValueSet(*this); |
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288 | // } |
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289 | |
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290 | // /// The ValueSet of the Map. |
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291 | // typedef MapValueSet<ArrayMap> ValueSet; |
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292 | |
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293 | // /// ValueSet getter function. |
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294 | // ValueSet valueSet() { |
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295 | // return ValueSet(*this); |
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296 | // } |
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297 | |
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298 | private: |
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299 | |
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300 | void allocate_memory() { |
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301 | int max_id = IdMap(*graph).maxId(); |
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302 | if (max_id == -1) { |
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303 | capacity = 0; |
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304 | values = 0; |
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305 | return; |
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306 | } |
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307 | capacity = 1; |
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308 | while (capacity <= max_id) { |
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309 | capacity <<= 1; |
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310 | } |
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311 | values = allocator.allocate(capacity); |
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312 | } |
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313 | |
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314 | const Graph* graph; |
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315 | int capacity; |
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316 | Value* values; |
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317 | Allocator allocator; |
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318 | |
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319 | public: |
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320 | // // STL compatibility typedefs. |
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321 | // typedef Iterator iterator; |
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322 | // typedef ConstIterator const_iterator; |
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323 | // typedef typename Iterator::PairValueType value_type; |
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324 | // typedef typename Iterator::KeyType key_type; |
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325 | // typedef typename Iterator::ValueType data_type; |
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326 | // typedef typename Iterator::PairReferenceType reference; |
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327 | // typedef typename Iterator::PairPointerType pointer; |
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328 | // typedef typename ConstIterator::PairReferenceType const_reference; |
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329 | // typedef typename ConstIterator::PairPointerType const_pointer; |
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330 | // typedef int difference_type; |
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331 | }; |
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332 | |
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333 | template <typename _Base> |
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334 | class ArrayMappableGraphExtender : public _Base { |
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335 | public: |
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336 | |
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337 | typedef ArrayMappableGraphExtender<_Base> Graph; |
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338 | typedef _Base Parent; |
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339 | |
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340 | typedef typename Parent::Node Node; |
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341 | typedef typename Parent::NodeIt NodeIt; |
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342 | typedef typename Parent::NodeIdMap NodeIdMap; |
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343 | typedef typename Parent::NodeObserverRegistry NodeObserverRegistry; |
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344 | |
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345 | typedef typename Parent::Edge Edge; |
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346 | typedef typename Parent::EdgeIt EdgeIt; |
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347 | typedef typename Parent::EdgeIdMap EdgeIdMap; |
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348 | typedef typename Parent::EdgeObserverRegistry EdgeObserverRegistry; |
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349 | |
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350 | |
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351 | |
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352 | template <typename _Value> |
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353 | class NodeMap : public ArrayMap<Graph, Node, NodeIt, NodeIdMap, _Value> { |
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354 | public: |
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355 | typedef ArrayMappableGraphExtender<_Base> Graph; |
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356 | |
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357 | typedef typename Graph::Node Node; |
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358 | typedef typename Graph::NodeIt NodeIt; |
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359 | typedef typename Graph::NodeIdMap NodeIdMap; |
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360 | |
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361 | typedef ArrayMap<Graph, Node, NodeIt, NodeIdMap, _Value> Parent; |
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362 | |
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363 | typedef typename Parent::Graph Graph; |
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364 | typedef typename Parent::Value Value; |
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365 | |
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366 | NodeMap(const Graph& g) |
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367 | : Parent(g, g.getNodeObserverRegistry()) {} |
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368 | NodeMap(const Graph& g, const Value& v) |
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369 | : Parent(g, g.getNodeObserverRegistry(), v) {} |
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370 | |
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371 | }; |
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372 | |
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373 | template <typename _Value> |
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374 | class EdgeMap : public ArrayMap<Graph, Edge, EdgeIt, EdgeIdMap, _Value> { |
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375 | public: |
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376 | typedef ArrayMappableGraphExtender<_Base> Graph; |
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377 | |
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378 | typedef typename Graph::Edge Edge; |
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379 | typedef typename Graph::EdgeIt EdgeIt; |
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380 | typedef typename Graph::EdgeIdMap EdgeIdMap; |
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381 | |
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382 | typedef ArrayMap<Graph, Edge, EdgeIt, EdgeIdMap, _Value> Parent; |
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383 | |
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384 | typedef typename Parent::Graph Graph; |
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385 | typedef typename Parent::Value Value; |
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386 | |
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387 | EdgeMap(const Graph& g) |
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388 | : Parent(g, g.getEdgeObserverRegistry()) {} |
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389 | EdgeMap(const Graph& g, const Value& v) |
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390 | : Parent(g, g.getEdgeObserverRegistry(), v) {} |
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391 | |
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392 | }; |
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393 | |
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394 | }; |
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395 | |
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396 | /// @} |
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397 | |
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398 | } |
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399 | |
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400 | #endif //LEMON_ARRAY_MAP_H |
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