Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccutil/unicity_table.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: unicity_table.h
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3 // Description: a class to uniquify objects, manipulating them using integers
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4 // ids.
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5 // Author: Samuel Charron
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6 //
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7 // (C) Copyright 2006, Google Inc.
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8 // Licensed under the Apache License, Version 2.0 (the "License");
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9 // you may not use this file except in compliance with the License.
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10 // You may obtain a copy of the License at
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11 // http://www.apache.org/licenses/LICENSE-2.0
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12 // Unless required by applicable law or agreed to in writing, software
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13 // distributed under the License is distributed on an "AS IS" BASIS,
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14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 // See the License for the specific language governing permissions and
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16 // limitations under the License.
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17 //
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18 ///////////////////////////////////////////////////////////////////////
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20 #ifndef TESSERACT_CCUTIL_UNICITY_TABLE_H_
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21 #define TESSERACT_CCUTIL_UNICITY_TABLE_H_
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23 #include "errcode.h"
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25 #include "genericvector.h"
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27 #include <functional> // for std::function
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29 namespace tesseract {
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31 // A class to uniquify objects, manipulating them using integers ids.
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32 // T requirements:
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33 // operator= to add an element
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34 // default-constructible: allocating the internal table will call the default
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35 // constructor.
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36 template <typename T>
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37 class UnicityTable {
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38 public:
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39 /// Clear the structures and deallocate internal structures.
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40 ~UnicityTable() {
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41 clear();
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42 }
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43
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44 /// Reserve some memory. If there is size or more elements, the table will
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45 /// then allocate size * 2 elements.
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46 void reserve(int size) {
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47 table_.reserve(size);
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48 }
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49
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50 /// Return the size used.
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51 int size() const {
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52 return table_.size();
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53 }
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54
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55 /// Return the object from an id.
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56 const T &at(int id) const {
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57 return table_.at(id);
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58 }
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59
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60 // Return the pointer to an object with the given id.
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61 T &at(int id) {
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62 return table_.at(id);
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63 }
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64
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65 T &operator[](size_t id) {
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66 return table_[id];
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67 }
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68 const T &operator[](size_t id) const {
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69 return table_[id];
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70 }
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71
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72 /// Return the id of the T object.
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73 /// This method NEEDS a compare_callback to be passed to
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74 /// set_compare_callback.
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75 int get_index(T object) const {
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76 return table_.get_index(object);
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77 }
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78
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79 /// Add an element in the table
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80 int push_back(T object) {
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81 auto idx = get_index(object);
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82 if (idx == -1) {
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83 idx = table_.push_back(std::move(object));
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84 }
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85 return idx;
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86 }
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87
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88 /// Add a callback to be called to delete the elements when the table took
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89 /// their ownership.
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90 void set_clear_callback(const std::function<void(T)> &cb) {
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91 table_.set_clear_callback(cb);
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92 }
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93
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94 /// Clear the table, calling the callback function if any.
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95 /// All the owned Callbacks are also deleted.
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96 /// If you don't want the Callbacks to be deleted, before calling clear, set
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97 /// the callback to nullptr.
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98 void clear() {
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99 table_.clear();
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100 }
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102 /// This method clear the current object, then, does a shallow copy of
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103 /// its argument, and finally invalidate its argument.
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104 void move(UnicityTable<T> *from) {
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105 table_.move(&from->table_);
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106 }
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107
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108 /// Read/Write the table to a file. This does _NOT_ read/write the callbacks.
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109 /// The Callback given must be permanent since they will be called more than
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110 /// once. The given callback will be deleted at the end.
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111 /// Returns false on read/write error.
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112 bool write(FILE *f, const std::function<bool(FILE *, const T &)> &cb) const {
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113 return table_.write(f, cb);
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114 }
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115 bool read(tesseract::TFile *f, const std::function<bool(tesseract::TFile *, T *)> &cb) {
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116 return table_.read(f, cb);
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117 }
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118
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119 private:
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120 GenericVector<T> table_;
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121 };
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122
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123 } // namespace tesseract
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124
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125 #endif // TESSERACT_CCUTIL_UNICITY_TABLE_H_