src/cx/map.h

Mon, 03 Apr 2023 19:20:30 +0200

author
Mike Becker <universe@uap-core.de>
date
Mon, 03 Apr 2023 19:20:30 +0200
changeset 674
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parent 669
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child 677
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permissions
-rw-r--r--

add stream copy utils - fixes #254

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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 #ifndef CX_STORE_POINTERS
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50 /**
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51 * Special constant used for creating collections that are storing pointers.
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52 */
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53 #define CX_STORE_POINTERS 0
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54 #endif
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55
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56 /** Type for the UCX map. */
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57 typedef struct cx_map_s CxMap;
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58
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59 /** Type for a map entry. */
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60 typedef struct cx_map_entry_s CxMapEntry;
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61
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62 /** Type for map class definitions. */
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63 typedef struct cx_map_class_s cx_map_class;
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64
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65 /** Structure for the UCX map. */
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66 struct cx_map_s {
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67 /** The map class definition. */
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68 cx_map_class *cl;
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69 /** An allocator that is used for the map elements. */
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70 CxAllocator *allocator;
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71 /** The number of elements currently stored. */
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72 size_t size;
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73 /**
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74 * The size of an element.
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75 */
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76 size_t itemsize;
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77 /**
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78 * True, if this map shall store pointers instead
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79 * of copies of objects.
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80 */
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81 bool store_pointers;
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82 };
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83
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84 /**
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85 * The class definition for arbitrary maps.
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86 */
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87 struct cx_map_class_s {
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88 /**
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89 * Deallocates the entire memory.
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90 */
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91 __attribute__((__nonnull__))
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92 void (*destructor)(struct cx_map_s *map);
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93
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94 /**
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95 * Removes all elements.
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96 */
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97 __attribute__((__nonnull__))
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98 void (*clear)(struct cx_map_s *map);
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99
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100 /**
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101 * Add or overwrite an element.
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102 */
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103 __attribute__((__nonnull__))
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104 int (*put)(
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105 CxMap *map,
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106 CxHashKey key,
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107 void *value
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108 );
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109
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110 /**
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111 * Returns an element.
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112 */
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113 __attribute__((__nonnull__, __warn_unused_result__))
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114 void *(*get)(
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115 CxMap const *map,
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116 CxHashKey key
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117 );
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118
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119 /**
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120 * Removes an element.
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121 */
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122 __attribute__((__nonnull__))
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123 void *(*remove)(
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124 CxMap *map,
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125 CxHashKey key
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126 );
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127
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128 /**
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129 * Iterator over the key/value pairs.
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130 */
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131 __attribute__((__nonnull__, __warn_unused_result__))
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132 CxIterator (*iterator)(CxMap const *map);
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133
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134 /**
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135 * Iterator over the keys.
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136 */
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137 __attribute__((__nonnull__, __warn_unused_result__))
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138 CxIterator (*iterator_keys)(CxMap const *map);
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139
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140 /**
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141 * Iterator over the values.
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142 */
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143 __attribute__((__nonnull__, __warn_unused_result__))
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144 CxIterator (*iterator_values)(CxMap const *map);
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145
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146 /**
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147 * Mutating iterator over the key/value pairs.
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148 */
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149 __attribute__((__nonnull__, __warn_unused_result__))
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150 CxMutIterator (*mut_iterator)(CxMap *map);
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151
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152 /**
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153 * Mutating iterator over the keys.
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154 */
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155 __attribute__((__nonnull__, __warn_unused_result__))
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156 CxMutIterator (*mut_iterator_keys)(CxMap *map);
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157
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158 /**
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159 * Mutating iterator over the values.
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160 */
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161 __attribute__((__nonnull__, __warn_unused_result__))
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162 CxMutIterator (*mut_iterator_values)(CxMap *map);
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163 };
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164
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165 /**
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166 * A map entry.
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167 */
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168 struct cx_map_entry_s {
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169 /**
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170 * A pointer to the key.
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171 */
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172 CxHashKey const *key;
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173 /**
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174 * A pointer to the value.
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175 */
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176 void *value;
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177 };
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178
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179 /**
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180 * Advises the map to store copies of the objects (default mode of operation).
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181 *
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182 * Retrieving objects from this map will yield pointers to the copies stored
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183 * within this list.
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184 *
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185 * @param map the map
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186 * @see cxMapStorePointers()
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187 */
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188 __attribute__((__nonnull__))
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189 static inline void cxMapStoreObjects(CxMap *map) {
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190 map->store_pointers = false;
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191 }
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192
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193 /**
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194 * Advises the map to only store pointers to the objects.
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195 *
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196 * Retrieving objects from this list will yield the original pointers stored.
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197 *
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198 * @note This function forcibly sets the element size to the size of a pointer.
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199 * Invoking this function on a non-empty map that already stores copies of
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200 * objects is undefined.
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201 *
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202 * @param map the map
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203 * @see cxMapStoreObjects()
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204 */
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205 __attribute__((__nonnull__))
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206 static inline void cxMapStorePointers(CxMap *map) {
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207 map->store_pointers = true;
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208 map->itemsize = sizeof(void *);
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209 }
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210
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211
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212 /**
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213 * Deallocates the memory of the specified map.
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214 *
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215 * @param map the map to be destroyed
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216 */
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217 __attribute__((__nonnull__))
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218 static inline void cxMapDestroy(CxMap *map) {
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219 // TODO: likely to add auto-free feature for contents in the future
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220 map->cl->destructor(map);
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221 }
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222
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223
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224 /**
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225 * Clears a map by removing all elements.
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226 *
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227 * @param map the map to be cleared
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228 */
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229 __attribute__((__nonnull__))
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230 static inline void cxMapClear(CxMap *map) {
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231 map->cl->clear(map);
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232 }
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233
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234 /**
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235 * Puts a key/value-pair into the map.
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236 *
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237 * @param map the map
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238 * @param key the key
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239 * @param value the value
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240 * @return 0 on success, non-zero value on failure
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241 */
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242 __attribute__((__nonnull__))
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243 static inline int cxMapPut(
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244 CxMap *map,
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245 CxHashKey key,
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246 void *value
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247 ) {
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248 return map->cl->put(map, key, value);
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249 }
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250
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251 /**
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252 * Retrieves a value by using a key.
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253 *
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254 * @param map the map
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255 * @param key the key
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256 * @return the value
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257 */
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258 __attribute__((__nonnull__, __warn_unused_result__))
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259 static inline void *cxMapGet(
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260 CxMap const *map,
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261 CxHashKey key
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262 ) {
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263 return map->cl->get(map, key);
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264 }
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265
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266 /**
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267 * Removes a key/value-pair from the map by using the key.
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268 *
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269 * If this map is storing pointers, you should make sure that the map
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270 * is not the last location where this pointer is stored.
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271 * Otherwise, use cxMapRemoveAndGet() to retrieve the pointer while
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272 * removing it from the map.
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273 *
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274 * @param map the map
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275 * @param key the key
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276 * @see cxMapRemoveAndGet()
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277 */
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278 __attribute__((__nonnull__))
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279 static inline void cxMapRemove(
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280 CxMap *map,
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281 CxHashKey key
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282 ) {
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283 (void) map->cl->remove(map, key);
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284 }
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285
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286 /**
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287 * Removes a key/value-pair from the map by using the key.
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288 *
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289 * This function should only be used when the map is storing pointers,
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290 * in order to retrieve the pointer you are about to remove.
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291 * In any other case, cxMapRemove() is sufficient.
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292 *
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293 * @param map the map
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294 * @param key the key
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295 * @return the stored pointer or \c NULL if either the key is not present
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296 * in the map or the map is not storing pointers
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297 * @see cxMapStorePointers()
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298 */
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299 __attribute__((__nonnull__, __warn_unused_result__))
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300 static inline void *cxMapRemoveAndGet(
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301 CxMap *map,
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302 CxHashKey key
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303 ) {
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304 return map->cl->remove(map, key);
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305 }
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306
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307 // TODO: set-like map operations (union, intersect, difference)
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308
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309 /**
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310 * Creates a value iterator for a map.
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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 values
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317 */
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318 __attribute__((__nonnull__, __warn_unused_result__))
551
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319 static inline CxIterator cxMapIteratorValues(CxMap *map) {
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320 return map->cl->iterator_values(map);
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321 }
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322
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323 /**
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324 * Creates a key iterator for a map.
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325 *
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326 * The elements of the iterator are keys of type CxHashKey.
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327 *
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328 * \note An iterator iterates over all elements successively. Therefore the order
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329 * highly depends on the map implementation and may change arbitrarily when the contents change.
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330 *
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331 * @param map the map to create the iterator for
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332 * @return an iterator for the currently stored keys
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333 */
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334 __attribute__((__nonnull__, __warn_unused_result__))
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335 static inline CxIterator cxMapIteratorKeys(CxMap *map) {
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336 return map->cl->iterator_keys(map);
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337 }
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338
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339 /**
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340 * Creates an iterator for a map.
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341 *
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342 * The elements of the iterator are key/value pairs of type CxMapEntry.
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343 *
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344 * \note An iterator iterates over all elements successively. Therefore the order
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345 * highly depends on the map implementation and may change arbitrarily when the contents change.
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346 *
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347 * @param map the map to create the iterator for
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348 * @return an iterator for the currently stored entries
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349 * @see cxMapIteratorKeys()
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350 * @see cxMapIteratorValues()
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351 */
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352 __attribute__((__nonnull__, __warn_unused_result__))
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353 static inline CxIterator cxMapIterator(CxMap *map) {
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354 return map->cl->iterator(map);
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355 }
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356
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357
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358 /**
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359 * Creates a mutating iterator over the values of a map.
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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 values
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366 */
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367 __attribute__((__nonnull__, __warn_unused_result__))
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368 static inline CxMutIterator cxMapMutIteratorValues(CxMap *map) {
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369 return map->cl->mut_iterator_values(map);
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370 }
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371
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372 /**
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373 * Creates a mutating iterator over the keys of a map.
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374 *
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375 * The elements of the iterator are keys of type CxHashKey.
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376 *
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377 * \note An iterator iterates over all elements successively. Therefore the order
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378 * highly depends on the map implementation and may change arbitrarily when the contents change.
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379 *
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380 * @param map the map to create the iterator for
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381 * @return an iterator for the currently stored keys
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382 */
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383 __attribute__((__nonnull__, __warn_unused_result__))
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384 static inline CxMutIterator cxMapMutIteratorKeys(CxMap *map) {
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385 return map->cl->mut_iterator_keys(map);
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386 }
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387
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388 /**
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389 * Creates a mutating iterator for a map.
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390 *
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391 * The elements of the iterator are key/value pairs of type CxMapEntry.
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392 *
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393 * \note An iterator iterates over all elements successively. Therefore the order
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394 * highly depends on the map implementation and may change arbitrarily when the contents change.
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395 *
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396 * @param map the map to create the iterator for
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397 * @return an iterator for the currently stored entries
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398 * @see cxMapMutIteratorKeys()
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399 * @see cxMapMutIteratorValues()
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400 */
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401 __attribute__((__nonnull__, __warn_unused_result__))
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402 static inline CxMutIterator cxMapMutIterator(CxMap *map) {
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403 return map->cl->mut_iterator(map);
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404 }
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405
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406 #ifdef __cplusplus
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407 }
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408 #endif
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409
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410 #endif // UCX_MAP_H

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