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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 allocator.h |
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30 | * Interface for custom allocators. |
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31 | */ |
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32 | |
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33 | #ifndef UCX_ALLOCATOR_H |
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34 | #define UCX_ALLOCATOR_H |
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35 | |
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36 | #include "common.h" |
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37 | |
415 | 38 | #ifdef __cplusplus |
39 | extern "C" { | |
40 | #endif | |
41 | ||
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42 | /** |
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43 | * The class definition for an allocator. |
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44 | */ |
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45 | typedef struct { |
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46 | /** |
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47 | * The allocator's malloc() implementation. |
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48 | */ |
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49 | void *(*malloc)(void *data, size_t n); |
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50 | |
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51 | /** |
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52 | * The allocator's realloc() implementation. |
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53 | */ |
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54 | void *(*realloc)(void *data, void *mem, size_t n); |
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55 | |
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56 | /** |
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57 | * The allocator's calloc() implementation. |
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58 | */ |
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59 | void *(*calloc)(void *data, size_t nmemb, size_t size); |
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60 | |
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61 | /** |
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62 | * The allocator's free() implementation. |
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63 | */ |
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64 | void (*free)(void *data, void *mem); |
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65 | } cx_allocator_class; |
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66 | |
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67 | /** |
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68 | * Structure holding the data for an allocator. |
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69 | */ |
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70 | struct cx_allocator_s { |
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71 | /** |
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72 | * A pointer to the instance of the allocator class. |
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73 | */ |
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74 | cx_allocator_class *cl; |
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75 | /** |
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76 | * A pointer to the data this allocator uses. |
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77 | */ |
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78 | void *data; |
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79 | }; |
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80 | |
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81 | /** |
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82 | * High-Level type alias for the allocator type. |
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83 | */ |
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84 | typedef struct cx_allocator_s CxAllocator; |
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85 | |
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86 | /** |
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87 | * A pre-defined allocator using standard library malloc() etc. |
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88 | */ |
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89 | CX_EXPORT extern const CxAllocator * const cxStdlibAllocator; |
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90 | |
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91 | /** |
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92 | * The default allocator that is used by UCX. |
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93 | * Initialized with cxStdlibAllocator, but you may change it. |
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94 | */ |
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95 | CX_EXPORT extern const CxAllocator * cxDefaultAllocator; |
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96 | |
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97 | /** |
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98 | * Function pointer type for destructor functions. |
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99 | * |
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100 | * A destructor function deallocates possible contents and MAY free the memory |
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101 | * pointed to by @p memory. Read the documentation of the respective function |
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102 | * pointer to learn if a destructor SHALL, MAY, or MUST NOT free the memory in |
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103 | * that particular implementation. |
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104 | * |
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105 | * @param memory a pointer to the object to destruct |
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106 | */ |
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107 | typedef void (*cx_destructor_func)(void *memory); |
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108 | |
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109 | /** |
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110 | * Function pointer type for destructor functions. |
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111 | * |
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112 | * A destructor function deallocates possible contents and MAY free the memory |
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113 | * pointed to by @p memory. Read the documentation of the respective function |
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114 | * pointer to learn if a destructor SHALL, MAY, or MUST NOT free the memory in |
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115 | * that particular implementation. |
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116 | * |
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117 | * @param data an optional pointer to custom data |
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118 | * @param memory a pointer to the object to destruct |
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119 | */ |
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120 | typedef void (*cx_destructor_func2)(void *data, void *memory); |
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121 | |
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122 | /** |
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123 | * Reallocate a previously allocated block and changes the pointer in-place, |
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124 | * if necessary. |
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125 | * |
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126 | * @note This will use stdlib reallocate and @em not the cxDefaultAllocator. |
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127 | * |
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128 | * @par Error handling |
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129 | * @c errno will be set by realloc() on failure. |
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130 | * |
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131 | * @param mem pointer to the pointer to allocated block |
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132 | * @param n the new size in bytes |
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133 | * @retval zero success |
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134 | * @retval non-zero failure |
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135 | * @see cx_reallocatearray() |
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136 | */ |
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137 | cx_attr_nonnull cx_attr_nodiscard |
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138 | CX_EXPORT int cx_reallocate_( |
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139 | void **mem, |
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140 | size_t n |
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141 | ); |
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142 | |
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143 | /** |
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144 | * Reallocate a previously allocated block and changes the pointer in-place, |
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145 | * if necessary. |
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146 | * |
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147 | * The size is calculated by multiplying @p nemb and @p size. |
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148 | * |
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149 | * @note This will use stdlib reallocate and @em not the cxDefaultAllocator. |
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150 | * |
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151 | * @par Error handling |
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152 | * @c errno will be set by realloc() on failure or when the multiplication of |
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153 | * @p nmemb and @p size overflows. |
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154 | * |
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155 | * @param mem pointer to the pointer to allocated block |
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156 | * @param nmemb the number of elements |
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157 | * @param size the size of each element |
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158 | * @retval zero success |
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159 | * @retval non-zero failure |
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160 | * @see cx_reallocate() |
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161 | */ |
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162 | cx_attr_nonnull cx_attr_nodiscard |
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163 | CX_EXPORT int cx_reallocatearray_(void **mem, size_t nmemb, size_t size); |
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164 | |
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165 | /** |
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166 | * Reallocate a previously allocated block and changes the pointer in-place, |
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167 | * if necessary. |
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168 | * |
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169 | * @note This will use stdlib reallocate and @em not the cxDefaultAllocator. |
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170 | * |
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171 | * @par Error handling |
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172 | * @c errno will be set by realloc() on failure. |
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173 | * |
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174 | * @param mem (@c void**) pointer to the pointer to allocated block |
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175 | * @param n (@c size_t) the new size in bytes |
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176 | * @retval zero success |
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177 | * @retval non-zero failure |
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178 | * @see cx_reallocatearray() |
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179 | */ |
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180 | #define cx_reallocate(mem, n) cx_reallocate_((void**)(mem), n) |
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181 | |
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182 | /** |
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183 | * Reallocate a previously allocated block and changes the pointer in-place, |
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184 | * if necessary. |
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185 | * |
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186 | * The size is calculated by multiplying @p nemb and @p size. |
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187 | * |
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188 | * @note This will use stdlib reallocate and @em not the cxDefaultAllocator. |
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189 | * |
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190 | * @par Error handling |
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191 | * @c errno will be set by realloc() on failure or when the multiplication of |
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192 | * @p nmemb and @p size overflows. |
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193 | * |
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194 | * @param mem (@c void**) pointer to the pointer to allocated block |
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195 | * @param nmemb (@c size_t) the number of elements |
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196 | * @param size (@c size_t) the size of each element |
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197 | * @retval zero success |
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198 | * @retval non-zero failure |
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199 | */ |
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200 | #define cx_reallocatearray(mem, nmemb, size) \ |
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201 | cx_reallocatearray_((void**)(mem), nmemb, size) |
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202 | |
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203 | /** |
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204 | * Allocates memory and sets every byte to zero. |
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205 | * |
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206 | * @param n (@c size_t) the number of bytes |
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207 | * @return (@c void*) a pointer to the allocated memory |
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208 | */ |
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209 | #define cx_zalloc(n) calloc(1, n) |
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210 | |
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211 | /** |
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212 | * Free a block allocated by this allocator. |
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213 | * |
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214 | * @note Freeing a block of a different allocator is undefined. |
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215 | * |
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216 | * @param allocator the allocator |
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217 | * @param mem a pointer to the block to free |
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218 | */ |
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219 | cx_attr_nonnull_arg(1) |
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220 | CX_EXPORT void cxFree(const CxAllocator *allocator, void *mem); |
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221 | |
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222 | /** |
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223 | * Allocate @p n bytes of memory. |
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224 | * |
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225 | * @param allocator the allocator |
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226 | * @param n the number of bytes |
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227 | * @return a pointer to the allocated memory |
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228 | */ |
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229 | cx_attr_nodiscard cx_attr_nonnull |
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230 | cx_attr_malloc cx_attr_dealloc_ucx cx_attr_allocsize(2) |
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231 | CX_EXPORT void *cxMalloc(const CxAllocator *allocator, size_t n); |
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232 | |
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233 | /** |
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234 | * Reallocate the previously allocated block in @p mem, making the new block |
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235 | * @p n bytes long. |
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236 | * This function may return the same pointer passed to it if moving |
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237 | * the memory was not necessary. |
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238 | * |
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239 | * @note Re-allocating a block allocated by a different allocator is undefined. |
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240 | * |
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241 | * @param allocator the allocator |
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242 | * @param mem pointer to the previously allocated block |
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243 | * @param n the new size in bytes |
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244 | * @return a pointer to the reallocated memory |
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245 | */ |
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246 | cx_attr_nodiscard cx_attr_nonnull_arg(1) |
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247 | cx_attr_dealloc_ucx cx_attr_allocsize(3) |
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248 | CX_EXPORT void *cxRealloc(const CxAllocator *allocator, void *mem, size_t n); |
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249 | |
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250 | /** |
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251 | * Reallocate the previously allocated block in @p mem, making the new block |
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252 | * @p n bytes long. |
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253 | * This function may return the same pointer passed to it if moving |
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254 | * the memory was not necessary. |
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255 | * |
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256 | * The size is calculated by multiplying @p nemb and @p size. |
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257 | * If that multiplication overflows, this function returns @c NULL, and @c errno |
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258 | * will be set. |
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259 | * |
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260 | * @note Re-allocating a block allocated by a different allocator is undefined. |
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261 | * |
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262 | * @param allocator the allocator |
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263 | * @param mem pointer to the previously allocated block |
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264 | * @param nmemb the number of elements |
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265 | * @param size the size of each element |
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266 | * @return a pointer to the reallocated memory |
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267 | */ |
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268 | cx_attr_nodiscard cx_attr_nonnull_arg(1) |
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269 | cx_attr_dealloc_ucx cx_attr_allocsize(3, 4) |
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270 | CX_EXPORT void *cxReallocArray(const CxAllocator *allocator, |
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271 | void *mem, size_t nmemb, size_t size); |
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272 | |
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273 | /** |
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274 | * Reallocate a previously allocated block and changes the pointer in-place, |
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275 | * if necessary. |
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276 | * This function acts like cxRealloc() using the pointer pointed to by @p mem. |
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277 | * |
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278 | * @note Re-allocating a block allocated by a different allocator is undefined. |
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279 | * |
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280 | * @par Error handling |
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281 | * @c errno will be set if the underlying realloc function does so. |
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282 | * |
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283 | * @param allocator the allocator |
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284 | * @param mem pointer to the pointer to allocated block |
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285 | * @param n the new size in bytes |
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286 | * @retval zero success |
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287 | * @retval non-zero failure |
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288 | */ |
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289 | cx_attr_nodiscard cx_attr_nonnull |
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290 | CX_EXPORT int cxReallocate_(const CxAllocator *allocator, void **mem, size_t n); |
414 | 291 | |
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292 | /** |
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293 | * Reallocate a previously allocated block and changes the pointer in-place, |
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294 | * if necessary. |
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295 | * This function acts like cxRealloc() using the pointer pointed to by @p mem. |
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296 | * |
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297 | * @note Re-allocating a block allocated by a different allocator is undefined. |
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298 | * |
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299 | * @par Error handling |
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300 | * @c errno will be set if the underlying realloc function does so. |
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301 | * |
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302 | * @param allocator (@c CxAllocator*) the allocator |
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303 | * @param mem (@c void**) pointer to the pointer to allocated block |
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304 | * @param n (@c size_t) the new size in bytes |
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305 | * @retval zero success |
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306 | * @retval non-zero failure |
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307 | */ |
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308 | #define cxReallocate(allocator, mem, n) \ |
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309 | cxReallocate_(allocator, (void**)(mem), n) |
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310 | |
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311 | /** |
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312 | * Reallocate a previously allocated block and changes the pointer in-place, |
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313 | * if necessary. |
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314 | * This function acts like cxReallocArray() using the pointer pointed to |
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315 | * by @p mem. |
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316 | * |
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317 | * @note Re-allocating a block allocated by a different allocator is undefined. |
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318 | * |
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319 | * @par Error handling |
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320 | * @c errno will be set, if the underlying realloc function does so or the |
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321 | * multiplication of @p nmemb and @p size overflows. |
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322 | * |
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323 | * @param allocator the allocator |
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324 | * @param mem pointer to the pointer to allocated block |
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325 | * @param nmemb the number of elements |
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326 | * @param size the size of each element |
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327 | * @retval zero success |
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328 | * @retval non-zero on failure |
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329 | */ |
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330 | cx_attr_nodiscard cx_attr_nonnull |
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331 | CX_EXPORT int cxReallocateArray_(const CxAllocator *allocator, |
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332 | void **mem, size_t nmemb, size_t size); |
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333 | |
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334 | /** |
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335 | * Reallocate a previously allocated block and changes the pointer in-place, |
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336 | * if necessary. |
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337 | * This function acts like cxReallocArray() using the pointer pointed to |
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338 | * by @p mem. |
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339 | * |
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340 | * @note Re-allocating a block allocated by a different allocator is undefined. |
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341 | * |
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342 | * @par Error handling |
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343 | * @c errno will be set, if the underlying realloc function does so or the |
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344 | * multiplication of @p nmemb and @p size overflows. |
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345 | * |
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346 | * @param allocator (@c CxAllocator*) the allocator |
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347 | * @param mem (@c void**) pointer to the pointer to allocated block |
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348 | * @param nmemb (@c size_t) the number of elements |
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349 | * @param size (@c size_t) the size of each element |
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350 | * @retval zero success |
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351 | * @retval non-zero failure |
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352 | */ |
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353 | #define cxReallocateArray(allocator, mem, nmemb, size) \ |
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354 | cxReallocateArray_(allocator, (void**) (mem), nmemb, size) |
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355 | |
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356 | /** |
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357 | * Allocate @p nmemb elements of @p n bytes each, all initialized to zero. |
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358 | * |
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359 | * @param allocator the allocator |
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360 | * @param nmemb the number of elements |
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361 | * @param size the size of each element in bytes |
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362 | * @return a pointer to the allocated memory |
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363 | */ |
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364 | cx_attr_nonnull_arg(1) cx_attr_nodiscard |
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365 | cx_attr_malloc cx_attr_dealloc_ucx cx_attr_allocsize(2, 3) |
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366 | CX_EXPORT void *cxCalloc(const CxAllocator *allocator, size_t nmemb, size_t size); |
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367 | |
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368 | /** |
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369 | * Allocate @p n bytes of memory and sets every byte to zero. |
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370 | * |
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371 | * @param allocator the allocator |
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372 | * @param n the number of bytes |
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373 | * @return a pointer to the allocated memory |
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374 | */ |
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375 | cx_attr_nodiscard cx_attr_nonnull |
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376 | cx_attr_malloc cx_attr_dealloc_ucx cx_attr_allocsize(2) |
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377 | CX_EXPORT void *cxZalloc(const CxAllocator *allocator, size_t n); |
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378 | |
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379 | /** |
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380 | * Convenience macro that invokes cxMalloc() with the cxDefaultAllocator. |
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381 | */ |
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382 | #define cxMallocDefault(...) cxMalloc(cxDefaultAllocator, __VA_ARGS__) |
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383 | /** |
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384 | * Convenience macro that invokes cxZalloc() with the cxDefaultAllocator. |
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385 | */ |
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386 | #define cxZallocDefault(...) cxZalloc(cxDefaultAllocator, __VA_ARGS__) |
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387 | /** |
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388 | * Convenience macro that invokes cxCalloc() with the cxDefaultAllocator. |
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389 | */ |
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390 | #define cxCallocDefault(...) cxCalloc(cxDefaultAllocator, __VA_ARGS__) |
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391 | /** |
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392 | * Convenience macro that invokes cxRealloc() with the cxDefaultAllocator. |
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393 | */ |
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394 | #define cxReallocDefault(...) cxRealloc(cxDefaultAllocator, __VA_ARGS__) |
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395 | /** |
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396 | * Convenience macro that invokes cxReallocate() with the cxDefaultAllocator. |
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397 | */ |
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398 | #define cxReallocateDefault(...) cxReallocate(cxDefaultAllocator, __VA_ARGS__) |
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399 | /** |
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400 | * Convenience macro that invokes cxReallocateArray() with the cxDefaultAllocator. |
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401 | */ |
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402 | #define cxReallocateArrayDefault(...) cxReallocateArray(cxDefaultAllocator, __VA_ARGS__) |
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403 | /** |
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404 | * Convenience macro that invokes cxReallocArray() with the cxDefaultAllocator. |
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405 | */ |
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406 | #define cxReallocArrayDefault(...) cxReallocArray(cxDefaultAllocator, __VA_ARGS__) |
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407 | /** |
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408 | * Convenience macro that invokes cxFree() with the cxDefaultAllocator. |
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409 | */ |
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410 | #define cxFreeDefault(...) cxFree(cxDefaultAllocator, __VA_ARGS__) |
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411 | |
415 | 412 | #ifdef __cplusplus |
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413 | } // extern "C" |
415 | 414 | #endif |
415 | ||
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416 | #endif // UCX_ALLOCATOR_H |