Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccutil/kdpair.h @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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1 // Copyright 2012 Google Inc. All Rights Reserved.
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2 // Author: rays@google.com (Ray Smith)
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3 ///////////////////////////////////////////////////////////////////////
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4 // File: kdpair.h
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5 // Description: Template pair class like STL pair but geared towards
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6 // the Key+Data design pattern in which some data needs
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7 // to be sorted or kept in a heap sorted on some separate key.
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8 // Author: Ray Smith.
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9 //
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10 // (C) Copyright 2012, Google Inc.
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11 // Licensed under the Apache License, Version 2.0 (the "License");
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12 // you may not use this file except in compliance with the License.
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13 // You may obtain a copy of the License at
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14 // http://www.apache.org/licenses/LICENSE-2.0
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15 // Unless required by applicable law or agreed to in writing, software
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16 // distributed under the License is distributed on an "AS IS" BASIS,
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17 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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18 // See the License for the specific language governing permissions and
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19 // limitations under the License.
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20 //
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21 ///////////////////////////////////////////////////////////////////////
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23 #ifndef TESSERACT_CCUTIL_KDPAIR_H_
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24 #define TESSERACT_CCUTIL_KDPAIR_H_
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26 #include <vector>
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28 namespace tesseract {
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30 // A useful base struct to facilitate the common operation of sorting a vector
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31 // of simple or smart-pointer data using a separate key. Similar to STL pair.
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32 template <typename Key, typename Data>
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33 struct KDPair {
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34 KDPair() = default;
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35 KDPair(Key k, Data d) : data_(d), key_(k) {}
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36
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37 int operator==(const KDPair<Key, Data> &other) const {
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38 return key_ == other.key_;
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39 }
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40
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41 Data &data() {
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42 return data_;
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43 }
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44 const Data &data() const {
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45 return data_;
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46 }
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47 Key &key() {
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48 return key_;
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49 }
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50 const Key &key() const {
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51 return key_;
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52 }
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53
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54 // WARNING! Keep data as the first element! KDPairInc and KDPairDec depend
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55 // on the order of these elements so they can downcast pointers appropriately
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56 // for use by GenericHeap::Reshuffle.
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57 Data data_;
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58 Key key_;
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59 };
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60 // Specialization of KDPair to provide operator< for sorting in increasing order
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61 // and recasting of data pointers for use with DoublePtr.
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62 template <typename Key, typename Data>
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63 struct KDPairInc : public KDPair<Key, Data> {
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64 KDPairInc() = default;
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65 KDPairInc(Key k, Data d) : KDPair<Key, Data>(k, d) {}
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66 // Operator< facilitates sorting in increasing order.
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67 int operator<(const KDPairInc<Key, Data> &other) const {
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68 return this->key() < other.key();
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69 }
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70 // Returns the input Data pointer recast to a KDPairInc pointer.
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71 // Just casts a pointer to the first element to a pointer to the whole struct.
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72 static KDPairInc *RecastDataPointer(Data *data_ptr) {
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73 return reinterpret_cast<KDPairInc *>(data_ptr);
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74 }
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75 };
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76 // Specialization of KDPair to provide operator< for sorting in decreasing order
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77 // and recasting of data pointers for use with DoublePtr.
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78 template <typename Key, typename Data>
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79 struct KDPairDec : public KDPair<Key, Data> {
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80 KDPairDec() = default;
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81 KDPairDec(Key k, Data d) : KDPair<Key, Data>(k, d) {}
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82 // Operator< facilitates sorting in decreasing order by using operator> on
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83 // the key values.
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84 int operator<(const KDPairDec<Key, Data> &other) const {
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85 return this->key() > other.key();
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86 }
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87 // Returns the input Data pointer recast to a KDPairDec pointer.
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88 // Just casts a pointer to the first element to a pointer to the whole struct.
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89 static KDPairDec *RecastDataPointer(Data *data_ptr) {
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90 return reinterpret_cast<KDPairDec *>(data_ptr);
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91 }
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92 };
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93
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94 // A useful base class to facilitate the common operation of sorting a vector
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95 // of owned pointer data using a separate key. This class owns its data pointer,
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96 // deleting it when it has finished with it, and providing copy constructor and
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97 // operator= that have move semantics so that the data does not get copied and
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98 // only a single instance of KDPtrPair holds a specific data pointer.
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99 template <typename Key, typename Data>
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100 class KDPtrPair {
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101 public:
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102 KDPtrPair() : data_(nullptr) {}
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103 KDPtrPair(Key k, Data *d) : data_(d), key_(k) {}
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104 // Copy constructor steals the pointer from src and nulls it in src, thereby
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105 // moving the (single) ownership of the data.
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106 KDPtrPair(const KDPtrPair &src) : data_(src.data_), key_(src.key_) {
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107 ((KDPtrPair &)src).data_ = nullptr;
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108 }
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109 // Destructor deletes data, assuming it is the sole owner.
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110 ~KDPtrPair() {
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111 delete this->data_;
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112 this->data_ = nullptr;
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113 }
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114 // Operator= steals the pointer from src and nulls it in src, thereby
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115 // moving the (single) ownership of the data.
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116 void operator=(const KDPtrPair &src) {
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117 delete this->data_;
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118 this->data_ = src.data_;
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119 ((KDPtrPair &)src).data_ = nullptr;
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120 this->key_ = src.key_;
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121 }
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122
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123 int operator==(const KDPtrPair<Key, Data> &other) const {
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124 return key_ == other.key_;
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125 }
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126
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127 // Accessors.
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128 const Key &key() const {
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129 return key_;
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130 }
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131 void set_key(const Key &new_key) {
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132 key_ = new_key;
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133 }
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134 const Data *data() const {
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135 return data_;
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136 }
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137 // Sets the data pointer, taking ownership of the data.
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138 void set_data(Data *new_data) {
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139 delete data_;
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140 data_ = new_data;
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141 }
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142 // Relinquishes ownership of the data pointer (setting it to nullptr).
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143 Data *extract_data() {
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144 Data *result = data_;
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145 data_ = nullptr;
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146 return result;
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147 }
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148
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149 private:
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150 // Data members are private to keep deletion of data_ encapsulated.
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151 Data *data_;
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152 Key key_;
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153 };
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154 // Specialization of KDPtrPair to provide operator< for sorting in increasing
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155 // order.
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156 template <typename Key, typename Data>
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157 struct KDPtrPairInc : public KDPtrPair<Key, Data> {
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158 // Since we are doing non-standard stuff we have to duplicate *all* the
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159 // constructors and operator=.
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160 KDPtrPairInc() : KDPtrPair<Key, Data>() {}
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161 KDPtrPairInc(Key k, Data *d) : KDPtrPair<Key, Data>(k, d) {}
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162 KDPtrPairInc(const KDPtrPairInc &src) : KDPtrPair<Key, Data>(src) {}
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163 void operator=(const KDPtrPairInc &src) {
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164 KDPtrPair<Key, Data>::operator=(src);
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165 }
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166 // Operator< facilitates sorting in increasing order.
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167 int operator<(const KDPtrPairInc<Key, Data> &other) const {
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168 return this->key() < other.key();
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169 }
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170 };
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171 // Specialization of KDPtrPair to provide operator< for sorting in decreasing
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172 // order.
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173 template <typename Key, typename Data>
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174 struct KDPtrPairDec : public KDPtrPair<Key, Data> {
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175 // Since we are doing non-standard stuff we have to duplicate *all* the
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176 // constructors and operator=.
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177 KDPtrPairDec() : KDPtrPair<Key, Data>() {}
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178 KDPtrPairDec(Key k, Data *d) : KDPtrPair<Key, Data>(k, d) {}
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179 KDPtrPairDec(const KDPtrPairDec &src) : KDPtrPair<Key, Data>(src) {}
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180 void operator=(const KDPtrPairDec &src) {
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181 KDPtrPair<Key, Data>::operator=(src);
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182 }
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183 // Operator< facilitates sorting in decreasing order by using operator> on
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184 // the key values.
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185 int operator<(const KDPtrPairDec<Key, Data> &other) const {
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186 return this->key() > other.key();
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187 }
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188 };
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189
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190 // Specialization for a pair of ints in increasing order.
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191 using IntKDPair = KDPairInc<int, int>;
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192
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193 // Vector of IntKDPair.
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194 class KDVector : public std::vector<IntKDPair> {
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195 // TODO(rays) Add some code to manipulate a KDVector. For now there
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196 // is nothing and this class is effectively a specialization typedef.
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197 };
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198
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199 } // namespace tesseract
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201 #endif // TESSERACT_CCUTIL_KDPAIR_H_