1 | /* -*- C++ -*- |
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2 | * |
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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) 2003-2007 |
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6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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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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19 | #ifndef LEMON_CONCEPT_MAPS_H |
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20 | #define LEMON_CONCEPT_MAPS_H |
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21 | |
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22 | #include <lemon/bits/utility.h> |
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23 | #include <lemon/concept_check.h> |
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24 | |
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25 | ///\ingroup concept |
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26 | ///\file |
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27 | ///\brief Map concepts checking classes for testing and documenting. |
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28 | |
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29 | namespace lemon { |
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30 | |
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31 | namespace concepts { |
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32 | |
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33 | /// \addtogroup concept |
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34 | /// @{ |
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35 | |
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36 | /// Readable map concept |
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37 | template<typename K, typename T> |
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38 | class ReadMap |
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39 | { |
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40 | public: |
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41 | /// Map's key type. |
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42 | typedef K Key; |
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43 | /// Map's value type. (The type of objects associated with the keys). |
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44 | typedef T Value; |
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45 | |
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46 | /// Returns the value associated with a key. |
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47 | |
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48 | /// \bug Value should n't need to be default constructible. |
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49 | /// |
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50 | Value operator[](const Key &) const {return Value();} |
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51 | |
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52 | template<typename _ReadMap> |
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53 | struct Constraints { |
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54 | |
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55 | void constraints() { |
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56 | Value val = m[key]; |
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57 | val = m[key]; |
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58 | typename _ReadMap::Value own_val = m[own_key]; |
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59 | own_val = m[own_key]; |
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60 | |
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61 | ignore_unused_variable_warning(val); |
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62 | ignore_unused_variable_warning(own_val); |
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63 | ignore_unused_variable_warning(key); |
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64 | } |
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65 | Key& key; |
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66 | typename _ReadMap::Key& own_key; |
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67 | _ReadMap& m; |
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68 | }; |
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69 | |
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70 | }; |
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71 | |
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72 | |
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73 | /// Writable map concept |
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74 | template<typename K, typename T> |
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75 | class WriteMap |
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76 | { |
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77 | public: |
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78 | /// Map's key type. |
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79 | typedef K Key; |
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80 | /// Map's value type. (The type of objects associated with the keys). |
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81 | typedef T Value; |
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82 | |
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83 | /// Sets the value associated with a key. |
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84 | void set(const Key &,const Value &) {} |
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85 | |
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86 | ///Default constructor |
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87 | WriteMap() {} |
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88 | |
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89 | template <typename _WriteMap> |
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90 | struct Constraints { |
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91 | void constraints() { |
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92 | // No constraints for constructor. |
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93 | m.set(key, val); |
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94 | m.set(own_key, own_val); |
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95 | ignore_unused_variable_warning(key); |
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96 | ignore_unused_variable_warning(val); |
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97 | ignore_unused_variable_warning(own_key); |
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98 | ignore_unused_variable_warning(own_val); |
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99 | } |
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100 | |
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101 | Value& val; |
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102 | typename _WriteMap::Value own_val; |
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103 | Key& key; |
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104 | typename _WriteMap::Key& own_key; |
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105 | _WriteMap& m; |
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106 | |
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107 | }; |
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108 | }; |
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109 | |
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110 | ///Read/Writable map concept |
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111 | template<typename K, typename T> |
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112 | class ReadWriteMap : public ReadMap<K,T>, |
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113 | public WriteMap<K,T> |
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114 | { |
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115 | public: |
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116 | /// Map's key type. |
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117 | typedef K Key; |
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118 | /// Map's value type. (The type of objects associated with the keys). |
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119 | typedef T Value; |
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120 | |
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121 | /// Returns the value associated with a key. |
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122 | Value operator[](const Key &) const {return Value();} |
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123 | /// Sets the value associated with a key. |
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124 | void set(const Key & ,const Value &) {} |
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125 | |
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126 | template<typename _ReadWriteMap> |
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127 | struct Constraints { |
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128 | void constraints() { |
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129 | checkConcept<ReadMap<K, T>, _ReadWriteMap >(); |
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130 | checkConcept<WriteMap<K, T>, _ReadWriteMap >(); |
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131 | } |
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132 | }; |
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133 | }; |
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134 | |
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135 | |
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136 | ///Dereferable map concept |
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137 | template<typename K, typename T, typename R, typename CR> |
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138 | class ReferenceMap : public ReadWriteMap<K,T> |
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139 | { |
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140 | public: |
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141 | /// Tag for reference maps. |
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142 | typedef True ReferenceMapTag; |
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143 | /// Map's key type. |
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144 | typedef K Key; |
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145 | /// Map's value type. (The type of objects associated with the keys). |
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146 | typedef T Value; |
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147 | /// Map's reference type. |
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148 | typedef R Reference; |
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149 | /// Map's const reference type. |
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150 | typedef CR ConstReference; |
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151 | |
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152 | protected: |
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153 | Value tmp; |
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154 | public: |
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155 | |
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156 | ///Returns a reference to the value associated to a key. |
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157 | Reference operator[](const Key &) { return tmp; } |
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158 | ///Returns a const reference to the value associated to a key. |
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159 | ConstReference operator[](const Key &) const |
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160 | { return tmp; } |
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161 | /// Sets the value associated with a key. |
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162 | void set(const Key &k,const Value &t) { operator[](k)=t; } |
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163 | |
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164 | // \todo rethink this concept |
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165 | template<typename _ReferenceMap> |
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166 | struct ReferenceMapConcept { |
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167 | |
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168 | void constraints() { |
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169 | checkConcept<ReadWriteMap, _ReferenceMap >(); |
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170 | m[key] = val; |
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171 | val = m[key]; |
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172 | m[key] = ref; |
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173 | ref = m[key]; |
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174 | m[own_key] = own_val; |
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175 | own_val = m[own_key]; |
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176 | m[own_key] = own_ref; |
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177 | own_ref = m[own_key]; |
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178 | } |
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179 | |
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180 | typename _ReferenceMap::Key& own_key; |
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181 | typename _ReferenceMap::Value& own_val; |
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182 | typename _ReferenceMap::Reference& own_ref; |
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183 | Key& key; |
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184 | Value& val; |
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185 | Reference& ref; |
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186 | _ReferenceMap& m; |
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187 | }; |
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188 | }; |
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189 | |
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190 | // @} |
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191 | |
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192 | } //namespace concepts |
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193 | } //namespace lemon |
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194 | #endif // LEMON_CONCEPT_MAPS_H |
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