Thu, 23 Feb 2023 18:58:15 +0100
make hashmap store objects instead of pointers by default - fixes #239
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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | /** |
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29 | * \file map.h |
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30 | * \brief Interface for map implementations. |
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31 | * \author Mike Becker |
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32 | * \author Olaf Wintermann |
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33 | * \version 3.0 |
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34 | * \copyright 2-Clause BSD License |
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35 | */ |
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36 | |
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37 | #ifndef UCX_MAP_H |
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38 | #define UCX_MAP_H |
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39 | |
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40 | #include "common.h" |
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41 | #include "allocator.h" |
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42 | #include "iterator.h" |
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43 | #include "hash_key.h" |
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44 | |
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45 | #ifdef __cplusplus |
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46 | extern "C" { |
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47 | #endif |
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48 | |
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49 | /** Type for the UCX map. */ |
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50 | typedef struct cx_map_s CxMap; |
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51 | |
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52 | /** Type for a map entry. */ |
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53 | typedef struct cx_map_entry_s CxMapEntry; |
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54 | |
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55 | /** Type for map class definitions. */ |
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56 | typedef struct cx_map_class_s cx_map_class; |
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57 | |
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58 | /** Structure for the UCX map. */ |
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59 | struct cx_map_s { |
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60 | /** The map class definition. */ |
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61 | cx_map_class *cl; |
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62 | /** An allocator that is used for the map elements. */ |
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63 | CxAllocator *allocator; |
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64 | /** The number of elements currently stored. */ |
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65 | size_t size; |
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66 | /** |
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67 | * The size of an element. |
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68 | */ |
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69 | size_t itemsize; |
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70 | /** |
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71 | * True, if this map shall store pointers instead |
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72 | * of copies of objects. |
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73 | */ |
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74 | bool store_pointers; |
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75 | }; |
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76 | |
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77 | /** |
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78 | * The class definition for arbitrary maps. |
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79 | */ |
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80 | struct cx_map_class_s { |
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81 | /** |
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82 | * Deallocates the entire memory. |
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83 | */ |
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84 | __attribute__((__nonnull__)) |
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85 | void (*destructor)(struct cx_map_s *map); |
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86 | |
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87 | /** |
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88 | * Removes all elements. |
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89 | */ |
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90 | __attribute__((__nonnull__)) |
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91 | void (*clear)(struct cx_map_s *map); |
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92 | |
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93 | /** |
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94 | * Add or overwrite an element. |
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95 | */ |
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96 | __attribute__((__nonnull__)) |
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97 | int (*put)( |
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98 | CxMap *map, |
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99 | CxHashKey key, |
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100 | void *value |
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101 | ); |
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102 | |
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103 | /** |
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104 | * Returns an element. |
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105 | */ |
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106 | __attribute__((__nonnull__, __warn_unused_result__)) |
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107 | void *(*get)( |
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108 | CxMap const *map, |
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109 | CxHashKey key |
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110 | ); |
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111 | |
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112 | /** |
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113 | * Removes an element. |
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114 | */ |
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115 | __attribute__((__nonnull__, __warn_unused_result__)) |
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116 | void *(*remove)( |
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117 | CxMap *map, |
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118 | CxHashKey key |
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119 | ); |
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120 | |
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121 | /** |
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122 | * Iterator over the key/value pairs. |
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123 | */ |
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124 | __attribute__((__nonnull__, __warn_unused_result__)) |
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125 | CxIterator (*iterator)(CxMap const *map); |
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126 | |
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127 | /** |
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128 | * Iterator over the keys. |
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129 | */ |
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130 | __attribute__((__nonnull__, __warn_unused_result__)) |
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131 | CxIterator (*iterator_keys)(CxMap const *map); |
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132 | |
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133 | /** |
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134 | * Iterator over the values. |
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135 | */ |
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136 | __attribute__((__nonnull__, __warn_unused_result__)) |
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137 | CxIterator (*iterator_values)(CxMap const *map); |
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138 | |
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139 | /** |
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140 | * Mutating iterator over the key/value pairs. |
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141 | */ |
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142 | __attribute__((__nonnull__, __warn_unused_result__)) |
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143 | CxMutIterator (*mut_iterator)(CxMap *map); |
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144 | |
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145 | /** |
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146 | * Mutating iterator over the keys. |
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147 | */ |
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148 | __attribute__((__nonnull__, __warn_unused_result__)) |
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149 | CxMutIterator (*mut_iterator_keys)(CxMap *map); |
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150 | |
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151 | /** |
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152 | * Mutating iterator over the values. |
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153 | */ |
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154 | __attribute__((__nonnull__, __warn_unused_result__)) |
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155 | CxMutIterator (*mut_iterator_values)(CxMap *map); |
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156 | }; |
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157 | |
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158 | /** |
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159 | * A map entry. |
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160 | */ |
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161 | struct cx_map_entry_s { |
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162 | /** |
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163 | * A pointer to the key. |
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164 | */ |
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165 | CxHashKey const *key; |
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166 | /** |
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167 | * A pointer to the value. |
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168 | */ |
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169 | void *value; |
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170 | }; |
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171 | |
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172 | /** |
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173 | * Advises the map to store copies of the objects (default mode of operation). |
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174 | * |
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175 | * Retrieving objects from this map will yield pointers to the copies stored |
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176 | * within this list. |
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177 | * |
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178 | * @param map the map |
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179 | * @see cxMapStorePointers() |
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180 | */ |
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181 | __attribute__((__nonnull__)) |
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182 | static inline void cxMapStoreObjects(CxMap *map) { |
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183 | map->store_pointers = false; |
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184 | } |
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185 | |
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186 | /** |
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187 | * Advises the map to only store pointers to the objects. |
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188 | * |
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189 | * Retrieving objects from this list will yield the original pointers stored. |
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190 | * |
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191 | * @note This function forcibly sets the element size to the size of a pointer. |
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192 | * Invoking this function on a non-empty map that already stores copies of |
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193 | * objects is undefined. |
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194 | * |
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195 | * @param map the map |
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196 | * @see cxMapStoreObjects() |
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197 | */ |
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198 | __attribute__((__nonnull__)) |
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199 | static inline void cxMapStorePointers(CxMap *map) { |
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200 | map->store_pointers = true; |
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201 | map->itemsize = sizeof(void *); |
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202 | } |
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203 | |
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204 | |
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205 | /** |
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206 | * Deallocates the memory of the specified map. |
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207 | * |
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208 | * @param map the map to be destroyed |
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209 | */ |
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210 | __attribute__((__nonnull__)) |
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211 | static inline void cxMapDestroy(CxMap *map) { |
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212 | // TODO: likely to add auto-free feature for contents in the future |
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213 | map->cl->destructor(map); |
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214 | } |
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215 | |
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216 | |
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217 | /** |
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218 | * Clears a map by removing all elements. |
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219 | * |
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220 | * @param map the map to be cleared |
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221 | */ |
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222 | __attribute__((__nonnull__)) |
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223 | static inline void cxMapClear(CxMap *map) { |
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224 | map->cl->clear(map); |
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225 | } |
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226 | |
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227 | /** |
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228 | * Puts a key/value-pair into the map. |
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229 | * |
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230 | * @param map the map |
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231 | * @param key the key |
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232 | * @param value the value |
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233 | * @return 0 on success, non-zero value on failure |
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234 | */ |
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235 | __attribute__((__nonnull__)) |
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236 | static inline int cxMapPut( |
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237 | CxMap *map, |
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238 | CxHashKey key, |
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239 | void *value |
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240 | ) { |
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241 | return map->cl->put(map, key, value); |
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242 | } |
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243 | |
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244 | /** |
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245 | * Retrieves a value by using a key. |
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246 | * |
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247 | * @param map the map |
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248 | * @param key the key |
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249 | * @return the value |
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250 | */ |
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251 | __attribute__((__nonnull__, __warn_unused_result__)) |
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252 | static inline void *cxMapGet( |
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253 | CxMap const *map, |
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254 | CxHashKey key |
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255 | ) { |
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256 | return map->cl->get(map, key); |
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257 | } |
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258 | |
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259 | /** |
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260 | * Removes a key/value-pair from the map by using the key. |
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261 | * |
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262 | * @param map the map |
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263 | * @param key the key |
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264 | * @return if this map is storing pointers, the removed value, \c NULL otherwise |
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265 | * @see cxMapStorePointers() |
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266 | */ |
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267 | __attribute__((__nonnull__, __warn_unused_result__)) |
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268 | static inline void *cxMapRemove( |
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269 | CxMap *map, |
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270 | CxHashKey key |
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271 | ) { |
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272 | return map->cl->remove(map, key); |
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273 | } |
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274 | |
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275 | // TODO: set-like map operations (union, intersect, difference) |
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276 | |
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277 | /** |
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278 | * Creates a value iterator for a map. |
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279 | * |
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280 | * \note An iterator iterates over all elements successively. Therefore the order |
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281 | * highly depends on the map implementation and may change arbitrarily when the contents change. |
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282 | * |
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283 | * @param map the map to create the iterator for |
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284 | * @return an iterator for the currently stored values |
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285 | */ |
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286 | __attribute__((__nonnull__, __warn_unused_result__)) |
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287 | static inline CxIterator cxMapIteratorValues(CxMap *map) { |
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288 | return map->cl->iterator_values(map); |
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289 | } |
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290 | |
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291 | /** |
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292 | * Creates a key iterator for a map. |
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293 | * |
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294 | * The elements of the iterator are keys of type CxHashKey. |
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295 | * |
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296 | * \note An iterator iterates over all elements successively. Therefore the order |
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297 | * highly depends on the map implementation and may change arbitrarily when the contents change. |
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298 | * |
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299 | * @param map the map to create the iterator for |
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300 | * @return an iterator for the currently stored keys |
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301 | */ |
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302 | __attribute__((__nonnull__, __warn_unused_result__)) |
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303 | static inline CxIterator cxMapIteratorKeys(CxMap *map) { |
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304 | return map->cl->iterator_keys(map); |
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305 | } |
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306 | |
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307 | /** |
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308 | * Creates an iterator for a map. |
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309 | * |
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310 | * The elements of the iterator are key/value pairs of type CxMapEntry. |
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311 | * |
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312 | * \note An iterator iterates over all elements successively. Therefore the order |
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313 | * highly depends on the map implementation and may change arbitrarily when the contents change. |
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314 | * |
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315 | * @param map the map to create the iterator for |
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316 | * @return an iterator for the currently stored entries |
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317 | * @see cxMapIteratorKeys() |
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318 | * @see cxMapIteratorValues() |
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319 | */ |
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320 | __attribute__((__nonnull__, __warn_unused_result__)) |
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321 | static inline CxIterator cxMapIterator(CxMap *map) { |
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322 | return map->cl->iterator(map); |
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323 | } |
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324 | |
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325 | |
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326 | /** |
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327 | * Creates a mutating iterator over the values of a map. |
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328 | * |
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329 | * \note An iterator iterates over all elements successively. Therefore the order |
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330 | * highly depends on the map implementation and may change arbitrarily when the contents change. |
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331 | * |
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332 | * @param map the map to create the iterator for |
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333 | * @return an iterator for the currently stored values |
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334 | */ |
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335 | __attribute__((__nonnull__, __warn_unused_result__)) |
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336 | static inline CxMutIterator cxMapMutIteratorValues(CxMap *map) { |
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337 | return map->cl->mut_iterator_values(map); |
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338 | } |
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339 | |
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340 | /** |
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341 | * Creates a mutating iterator over the keys of a map. |
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342 | * |
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343 | * The elements of the iterator are keys of type CxHashKey. |
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344 | * |
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345 | * \note An iterator iterates over all elements successively. Therefore the order |
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346 | * highly depends on the map implementation and may change arbitrarily when the contents change. |
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347 | * |
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348 | * @param map the map to create the iterator for |
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349 | * @return an iterator for the currently stored keys |
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350 | */ |
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351 | __attribute__((__nonnull__, __warn_unused_result__)) |
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352 | static inline CxMutIterator cxMapMutIteratorKeys(CxMap *map) { |
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353 | return map->cl->mut_iterator_keys(map); |
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354 | } |
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355 | |
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356 | /** |
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357 | * Creates a mutating iterator for a map. |
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358 | * |
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359 | * The elements of the iterator are key/value pairs of type CxMapEntry. |
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360 | * |
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361 | * \note An iterator iterates over all elements successively. Therefore the order |
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362 | * highly depends on the map implementation and may change arbitrarily when the contents change. |
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363 | * |
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364 | * @param map the map to create the iterator for |
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365 | * @return an iterator for the currently stored entries |
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366 | * @see cxMapMutIteratorKeys() |
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367 | * @see cxMapMutIteratorValues() |
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368 | */ |
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369 | __attribute__((__nonnull__, __warn_unused_result__)) |
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370 | static inline CxMutIterator cxMapMutIterator(CxMap *map) { |
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371 | return map->cl->mut_iterator(map); |
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372 | } |
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373 | |
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374 | #ifdef __cplusplus |
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375 | } |
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376 | #endif |
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377 | |
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378 | #endif // UCX_MAP_H |