1 | /* -*- C++ -*- |
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2 | * lemon/iterable_maps.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 | #include <lemon/traits.h> |
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18 | #include <lemon/invalid.h> |
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19 | #include <vector> |
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20 | #include <limits> |
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21 | |
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22 | ///\ingroup maps |
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23 | ///\file |
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24 | ///\brief Maps that makes it possible to iterate through the keys having |
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25 | ///a certain value |
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26 | /// |
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27 | /// |
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28 | |
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29 | |
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30 | namespace lemon { |
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31 | |
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32 | ///\todo This is only a static map! |
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33 | ///\todo Undocumented. |
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34 | ///\param BaseMap is an interger map. |
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35 | template<class BaseMap> |
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36 | class IterableBoolMap |
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37 | { |
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38 | public: |
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39 | |
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40 | typedef typename BaseMap::Key Key; |
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41 | typedef bool Value; |
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42 | |
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43 | friend class RefType; |
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44 | friend class FalseIt; |
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45 | friend class TrueIt; |
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46 | |
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47 | private: |
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48 | BaseMap &cref; |
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49 | std::vector<Key> vals; |
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50 | int sep; //map[e] is true <=> cref[e]>=sep |
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51 | |
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52 | bool isTrue(Key k) {return cref[k]>=sep;} |
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53 | void swap(Key k, int s) |
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54 | { |
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55 | int ti=cref[k]; |
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56 | Key tk=vals[s]; |
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57 | cref[k]=s; vals[s]=k; |
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58 | cref[tk]=ti; vals[ti]=tk; |
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59 | } |
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60 | |
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61 | void setTrue(Key k) { if(cref[k]<sep) { sep--; swap(k,sep); } } |
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62 | void setFalse(Key k) { if(cref[k]>=sep) { swap(k,sep); sep++; } } |
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63 | |
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64 | public: |
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65 | ///\e |
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66 | void set(Key k,Value v) { if(v) setTrue(k); else setFalse(k);} |
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67 | ///Number of \c true items in the map |
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68 | |
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69 | ///Returns the number of \c true values in the map. |
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70 | ///This is a constant time operation. |
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71 | int countTrue() { return vals.size()-sep; } |
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72 | ///Number of \c false items in the map |
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73 | |
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74 | ///Returns the number of \c false values in the map. |
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75 | ///This is a constant time operation. |
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76 | int countFalse() { return sep; } |
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77 | |
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78 | ///\e |
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79 | class FalseIt |
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80 | { |
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81 | const IterableBoolMap &M; |
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82 | int i; |
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83 | public: |
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84 | ///\e |
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85 | explicit FalseIt(const IterableBoolMap &_M) : M(_M), i(0) { } |
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86 | ///\e |
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87 | FalseIt(Invalid) |
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88 | : M(*((IterableBoolMap*)(0))), i(std::numeric_limits<int>::max()) { } |
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89 | ///\e |
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90 | FalseIt &operator++() { ++i; return *this;} |
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91 | ///\e |
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92 | operator Key() const { return i<M.sep ? M.vals[i] : INVALID; } |
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93 | ///\e |
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94 | bool operator !=(Invalid) const { return i<M.sep; } |
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95 | ///\e |
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96 | bool operator ==(Invalid) const { return i>=M.sep; } |
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97 | }; |
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98 | ///\e |
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99 | class TrueIt |
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100 | { |
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101 | const IterableBoolMap &M; |
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102 | int i; |
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103 | public: |
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104 | ///\e |
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105 | explicit TrueIt(const IterableBoolMap &_M) |
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106 | : M(_M), i(M.vals.size()-1) { } |
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107 | ///\e |
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108 | TrueIt(Invalid) |
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109 | : M(*((IterableBoolMap*)(0))), i(-1) { } |
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110 | ///\e |
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111 | TrueIt &operator++() { --i; return *this;} |
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112 | ///\e |
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113 | operator Key() const { return i>=M.sep ? M.vals[i] : INVALID; } |
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114 | ///\e |
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115 | bool operator !=(Invalid) const { return i>=M.sep; } |
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116 | ///\e |
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117 | bool operator ==(Invalid) const { return i<M.sep; } |
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118 | }; |
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119 | |
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120 | ///\e |
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121 | class RefType |
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122 | { |
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123 | IterableBoolMap &M; |
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124 | Key k; |
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125 | public: |
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126 | RefType(IterableBoolMap &_M,Key _k) : M(_M), k(_k) { } |
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127 | |
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128 | operator Value() const |
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129 | { |
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130 | return M.isTrue(k); |
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131 | } |
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132 | Value operator = (Value v) const { M.set(k,v); return v; } |
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133 | }; |
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134 | |
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135 | public: |
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136 | explicit IterableBoolMap(BaseMap &_m,bool init=false) : cref(_m) |
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137 | { |
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138 | sep=0; |
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139 | for(typename BaseMap::MapSet::iterator i=cref.mapSet().begin(); |
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140 | i!=cref.mapSet().end(); |
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141 | ++i) { |
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142 | i->second=sep; |
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143 | vals.push_back(i->first); |
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144 | sep++; |
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145 | } |
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146 | if(init) sep=0; |
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147 | } |
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148 | ///\e |
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149 | RefType operator[] (Key k) { return RefType(*this,k);} |
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150 | ///\e |
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151 | Value operator[] (Key k) const { return isTrue(k);} |
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152 | }; |
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153 | |
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154 | |
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155 | |
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156 | |
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157 | /// \addtogroup graph_maps |
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158 | /// @{ |
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159 | |
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160 | /// Iterable bool NodeMap |
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161 | |
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162 | /// This map can be used in the same way |
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163 | /// as the standard NodeMap<bool> of the |
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164 | /// given graph \c Graph. |
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165 | /// In addition, this class provides two iterators called \ref TrueIt |
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166 | /// and \ref FalseIt to iterate through the "true" and "false" nodes. |
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167 | template <class Graph> |
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168 | class IterableBoolNodeMap |
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169 | { |
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170 | typename Graph::template NodeMap<int> cmap; |
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171 | |
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172 | public: |
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173 | |
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174 | typedef IterableBoolMap<typename Graph::template NodeMap<int> > BimType; |
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175 | BimType imap; |
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176 | |
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177 | |
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178 | typedef typename BimType::RefType RefType; |
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179 | typedef typename Graph::Node Key; |
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180 | typedef bool Value; |
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181 | |
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182 | friend class FalseIt; |
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183 | friend class TrueIt; |
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184 | |
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185 | ///\e |
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186 | IterableBoolNodeMap(const Graph &g,bool b=false) : cmap(g), imap(cmap,b) {} |
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187 | |
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188 | public: |
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189 | ///\e |
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190 | void set(Key k, bool v) { imap.set(k,v);} |
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191 | ///Number of \c true items in the map |
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192 | |
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193 | ///Returns the number of \c true values in the map. |
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194 | ///This is a constant time operation. |
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195 | int countTrue() { return imap.countTrue(); } |
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196 | ///Number of \c false items in the map |
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197 | |
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198 | ///Returns the number of \c false values in the map. |
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199 | ///This is a constant time operation. |
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200 | int countFalse() { return imap.countFalse(); } |
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201 | #ifdef DOXYGEN |
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202 | ///\e |
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203 | bool &operator[](Key k) { return imap[k];} |
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204 | ///\e |
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205 | const bool &operator[](Key k) const { return imap[k];} |
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206 | #else |
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207 | Value operator[](Key k) const { return imap[k];} |
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208 | RefType operator[](Key k) { return imap[k];} |
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209 | #endif |
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210 | ///Iterator for the "false" nodes |
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211 | class FalseIt : public BimType::FalseIt |
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212 | { |
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213 | public: |
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214 | ///\e |
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215 | explicit FalseIt(const IterableBoolNodeMap &m) |
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216 | : BimType::FalseIt(m.imap) { } |
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217 | ///\e |
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218 | FalseIt(Invalid i) : BimType::FalseIt(i) { } |
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219 | }; |
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220 | ///Iterator for the "true" nodes |
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221 | class TrueIt : public BimType::TrueIt |
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222 | { |
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223 | public: |
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224 | ///\e |
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225 | explicit TrueIt(const IterableBoolNodeMap &m) |
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226 | : BimType::TrueIt(m.imap) { } |
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227 | ///\e |
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228 | TrueIt(Invalid i) : BimType::TrueIt(i) { } |
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229 | }; |
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230 | }; |
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231 | |
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232 | /// Iterable bool EdgeMap |
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233 | |
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234 | /// This map can be used in the same way |
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235 | /// as the standard EdgeMap<bool> of the |
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236 | /// given graph \c Graph. |
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237 | /// In addition, this class provides two iterators called \ref TrueIt |
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238 | /// and \ref FalseIt to iterate through the "true" and "false" edges. |
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239 | template <class Graph> |
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240 | class IterableBoolEdgeMap |
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241 | { |
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242 | typename Graph::template EdgeMap<int> cmap; |
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243 | |
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244 | public: |
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245 | |
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246 | typedef IterableBoolMap<typename Graph::template EdgeMap<int> > BimType; |
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247 | BimType imap; |
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248 | |
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249 | |
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250 | typedef typename BimType::RefType RefType; |
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251 | typedef typename Graph::Edge Key; |
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252 | typedef bool Value; |
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253 | |
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254 | friend class FalseIt; |
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255 | friend class TrueIt; |
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256 | |
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257 | ///\e |
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258 | IterableBoolEdgeMap(const Graph &g,bool b=false) : cmap(g), imap(cmap,b) {} |
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259 | |
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260 | public: |
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261 | ///\e |
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262 | void set(Key k, bool v) { imap.set(k,v);} |
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263 | ///Returns the number of \c true values in the map. |
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264 | ///This is a constant time operation. |
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265 | int countTrue() { return imap.countTrue(); } |
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266 | ///Number of \c false items in the map |
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267 | |
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268 | ///Returns the number of \c false values in the map. |
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269 | ///This is a constant time operation. |
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270 | int countFalse() { return imap.countFalse(); } |
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271 | #ifdef DOXYGEN |
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272 | ///\e |
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273 | bool &operator[](Key k) { return imap[k];} |
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274 | ///\e |
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275 | const bool &operator[](Key k) const { return imap[k];} |
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276 | #else |
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277 | Value operator[](Key k) const { return imap[k];} |
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278 | RefType operator[](Key k) { return imap[k];} |
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279 | #endif |
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280 | ///Iterator for the "false" edges |
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281 | class FalseIt : public BimType::FalseIt |
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282 | { |
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283 | public: |
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284 | ///\e |
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285 | explicit FalseIt(const IterableBoolEdgeMap &m) |
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286 | : BimType::FalseIt(m.imap) { } |
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287 | ///\e |
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288 | FalseIt(Invalid i) : BimType::FalseIt(i) { } |
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289 | }; |
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290 | ///Iterator for the "true" edges |
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291 | class TrueIt : public BimType::TrueIt |
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292 | { |
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293 | public: |
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294 | ///\e |
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295 | explicit TrueIt(const IterableBoolEdgeMap &m) |
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296 | : BimType::TrueIt(m.imap) { } |
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297 | ///\e |
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298 | TrueIt(Invalid i) : BimType::TrueIt(i) { } |
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299 | }; |
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300 | }; |
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301 | |
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302 | |
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303 | namespace _iterable_maps_bits { |
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304 | template <typename Item> |
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305 | struct IterableIntMapNode { |
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306 | IterableIntMapNode() : value(-1) {} |
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307 | Item prev, next; |
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308 | int value; |
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309 | }; |
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310 | } |
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311 | |
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312 | ///\ingroup maps |
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313 | /// |
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314 | /// \brief Dynamic iterable integer map. |
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315 | /// |
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316 | /// \todo Document please |
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317 | template <typename _Graph, typename _Item> |
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318 | class IterableIntMap : protected ItemSetTraits<_Graph, _Item> |
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319 | ::template Map<_iterable_maps_bits::IterableIntMapNode<_Item> >::Parent { |
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320 | public: |
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321 | typedef typename ItemSetTraits<_Graph, _Item> |
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322 | ::template Map<_iterable_maps_bits::IterableIntMapNode<_Item> > |
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323 | ::Parent Parent; |
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324 | |
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325 | typedef _Item Key; |
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326 | typedef int Value; |
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327 | typedef _Graph Graph; |
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328 | |
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329 | explicit IterableIntMap(const Graph& graph) : Parent(graph) {} |
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330 | |
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331 | private: |
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332 | |
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333 | void unlace(const Key& key) { |
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334 | typename Parent::Value& node = Parent::operator[](key); |
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335 | if (node.value < 0) return; |
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336 | if (node.prev != INVALID) { |
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337 | Parent::operator[](node.prev).next = node.next; |
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338 | } else { |
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339 | first[node.value] = node.next; |
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340 | } |
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341 | if (node.next != INVALID) { |
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342 | Parent::operator[](node.next).prev = node.prev; |
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343 | } |
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344 | while (!first.empty() && first.back() == INVALID) { |
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345 | first.pop_back(); |
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346 | } |
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347 | } |
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348 | |
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349 | void lace(const Key& key) { |
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350 | typename Parent::Value& node = Parent::operator[](key); |
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351 | if (node.value < 0) return; |
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352 | if (node.value >= (int)first.size()) { |
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353 | first.resize(node.value + 1, INVALID); |
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354 | } |
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355 | node.prev = INVALID; |
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356 | node.next = first[node.value]; |
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357 | if (node.next != INVALID) { |
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358 | Parent::operator[](node.next).prev = key; |
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359 | } |
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360 | first[node.value] = key; |
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361 | } |
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362 | |
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363 | public: |
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364 | |
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365 | typedef True ReferenceMapTag; |
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366 | |
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367 | class Reference { |
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368 | friend class IterableIntMap; |
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369 | private: |
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370 | Reference(IterableIntMap& map, const Key& key) |
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371 | : _key(key), _map(map) {} |
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372 | public: |
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373 | |
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374 | Reference& operator=(const Reference& value) { |
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375 | _map.set(_key, (const int&)value); |
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376 | return *this; |
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377 | } |
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378 | |
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379 | operator const int&() const { |
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380 | return static_cast<const IterableIntMap&>(_map)[_key]; |
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381 | } |
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382 | |
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383 | Reference& operator=(int value) { |
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384 | _map.set(_key, value); |
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385 | return *this; |
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386 | } |
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387 | Reference& operator++() { |
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388 | _map.set(_key, _map[_key] + 1); |
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389 | return *this; |
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390 | } |
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391 | int operator++(int) { |
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392 | int value = _map[_key]; |
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393 | _map.set(_key, value + 1); |
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394 | return value; |
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395 | } |
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396 | Reference& operator--() { |
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397 | _map.set(_key, _map[_key] - 1); |
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398 | return *this; |
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399 | } |
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400 | int operator--(int) { |
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401 | int value = _map[_key]; |
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402 | _map.set(_key, value - 1); |
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403 | return value; |
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404 | } |
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405 | Reference& operator+=(int value) { |
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406 | _map.set(_key, _map[_key] + value); |
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407 | return *this; |
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408 | } |
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409 | Reference& operator-=(int value) { |
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410 | _map.set(_key, _map[_key] - value); |
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411 | return *this; |
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412 | } |
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413 | Reference& operator*=(int value) { |
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414 | _map.set(_key, _map[_key] * value); |
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415 | return *this; |
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416 | } |
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417 | Reference& operator/=(int value) { |
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418 | _map.set(_key, _map[_key] / value); |
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419 | return *this; |
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420 | } |
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421 | Reference& operator%=(int value) { |
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422 | _map.set(_key, _map[_key] % value); |
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423 | return *this; |
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424 | } |
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425 | Reference& operator&=(int value) { |
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426 | _map.set(_key, _map[_key] & value); |
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427 | return *this; |
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428 | } |
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429 | Reference& operator|=(int value) { |
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430 | _map.set(_key, _map[_key] | value); |
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431 | return *this; |
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432 | } |
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433 | Reference& operator^=(int value) { |
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434 | _map.set(_key, _map[_key] ^ value); |
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435 | return *this; |
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436 | } |
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437 | Reference& operator<<=(int value) { |
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438 | _map.set(_key, _map[_key] << value); |
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439 | return *this; |
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440 | } |
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441 | Reference& operator>>=(int value) { |
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442 | _map.set(_key, _map[_key] >> value); |
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443 | return *this; |
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444 | } |
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445 | |
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446 | private: |
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447 | Key _key; |
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448 | IterableIntMap& _map; |
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449 | }; |
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450 | |
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451 | typedef const Value& ConstReference; |
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452 | |
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453 | int size() const { |
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454 | return (int)first.size(); |
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455 | } |
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456 | |
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457 | void set(const Key& key, const Value& value) { |
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458 | unlace(key); |
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459 | Parent::operator[](key).value = value; |
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460 | lace(key); |
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461 | } |
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462 | |
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463 | const Value& operator[](const Key& key) const { |
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464 | return Parent::operator[](key).value; |
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465 | } |
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466 | |
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467 | Reference operator[](const Key& key) { |
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468 | return Reference(*this, key); |
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469 | } |
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470 | |
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471 | class ItemIt : public _Item { |
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472 | public: |
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473 | typedef _Item Parent; |
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474 | |
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475 | ItemIt(Invalid) : Parent(INVALID), _map(0) {} |
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476 | |
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477 | ItemIt(const IterableIntMap& map, int value) : _map(&map) { |
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478 | if (value < 0 || value >= (int)_map->first.size()) { |
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479 | Parent::operator=(INVALID); |
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480 | } else { |
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481 | Parent::operator=(_map->first[value]); |
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482 | } |
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483 | } |
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484 | |
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485 | ItemIt& operator++() { |
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486 | Parent::operator=(_map->IterableIntMap::Parent:: |
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487 | operator[](static_cast<Parent&>(*this)).next); |
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488 | return *this; |
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489 | } |
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490 | |
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491 | |
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492 | private: |
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493 | const IterableIntMap* _map; |
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494 | }; |
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495 | |
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496 | protected: |
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497 | |
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498 | virtual void erase(const Key& key) { |
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499 | unlace(key); |
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500 | Parent::erase(key); |
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501 | } |
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502 | |
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503 | virtual void clear() { |
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504 | first.clear(); |
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505 | Parent::clear(); |
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506 | } |
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507 | |
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508 | private: |
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509 | std::vector<_Item> first; |
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510 | }; |
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511 | |
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512 | /// @} |
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513 | } |
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