src/list.c

Thu, 23 May 2024 15:05:24 +0200

author
Mike Becker <universe@uap-core.de>
date
Thu, 23 May 2024 15:05:24 +0200
changeset 850
b2bc48c2b251
parent 802
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child 853
d4baf4dd55c3
permissions
-rw-r--r--

add iterator over raw C arrays - closes #389

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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 #include "cx/list.h"
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30
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31 #include <string.h>
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32
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33 // <editor-fold desc="Store Pointers Functionality">
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34
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35 static _Thread_local cx_compare_func cx_pl_cmpfunc_impl;
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36
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37 static int cx_pl_cmpfunc(
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38 void const *l,
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39 void const *r
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40 ) {
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41 void *const *lptr = l;
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42 void *const *rptr = r;
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43 void const *left = lptr == NULL ? NULL : *lptr;
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44 void const *right = rptr == NULL ? NULL : *rptr;
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45 return cx_pl_cmpfunc_impl(left, right);
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46 }
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47
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48 static void cx_pl_hack_cmpfunc(struct cx_list_s const *list) {
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49 // cast away const - this is the hacky thing
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50 struct cx_list_s *l = (struct cx_list_s *) list;
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51 cx_pl_cmpfunc_impl = l->cmpfunc;
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52 l->cmpfunc = cx_pl_cmpfunc;
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53 }
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54
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55 static void cx_pl_unhack_cmpfunc(struct cx_list_s const *list) {
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56 // cast away const - this is the hacky thing
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57 struct cx_list_s *l = (struct cx_list_s *) list;
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58 l->cmpfunc = cx_pl_cmpfunc_impl;
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59 }
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60
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61 static void cx_pl_destructor(struct cx_list_s *list) {
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62 list->climpl->destructor(list);
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63 }
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64
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65 static int cx_pl_insert_element(
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66 struct cx_list_s *list,
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67 size_t index,
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68 void const *element
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69 ) {
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70 return list->climpl->insert_element(list, index, &element);
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71 }
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72
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73 static size_t cx_pl_insert_array(
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74 struct cx_list_s *list,
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75 size_t index,
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76 void const *array,
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77 size_t n
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78 ) {
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79 return list->climpl->insert_array(list, index, array, n);
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80 }
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81
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82 static int cx_pl_insert_iter(
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83 struct cx_mut_iterator_s *iter,
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84 void const *elem,
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85 int prepend
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86 ) {
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87 struct cx_list_s *list = iter->src_handle;
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88 return list->climpl->insert_iter(iter, &elem, prepend);
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89 }
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90
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91 static int cx_pl_remove(
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92 struct cx_list_s *list,
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93 size_t index
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94 ) {
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95 return list->climpl->remove(list, index);
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96 }
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97
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98 static void cx_pl_clear(struct cx_list_s *list) {
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99 list->climpl->clear(list);
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100 }
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101
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102 static int cx_pl_swap(
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103 struct cx_list_s *list,
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104 size_t i,
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105 size_t j
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106 ) {
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107 return list->climpl->swap(list, i, j);
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108 }
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109
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110 static void *cx_pl_at(
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111 struct cx_list_s const *list,
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112 size_t index
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113 ) {
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114 void **ptr = list->climpl->at(list, index);
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115 return ptr == NULL ? NULL : *ptr;
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116 }
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117
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118 static ssize_t cx_pl_find_remove(
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119 struct cx_list_s *list,
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120 void const *elem,
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121 bool remove
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122 ) {
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123 cx_pl_hack_cmpfunc(list);
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124 ssize_t ret = list->climpl->find_remove(list, &elem, remove);
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125 cx_pl_unhack_cmpfunc(list);
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126 return ret;
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127 }
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128
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129 static void cx_pl_sort(struct cx_list_s *list) {
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130 cx_pl_hack_cmpfunc(list);
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131 list->climpl->sort(list);
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132 cx_pl_unhack_cmpfunc(list);
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133 }
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134
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135 static int cx_pl_compare(
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136 struct cx_list_s const *list,
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137 struct cx_list_s const *other
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138 ) {
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139 cx_pl_hack_cmpfunc(list);
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140 int ret = list->climpl->compare(list, other);
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141 cx_pl_unhack_cmpfunc(list);
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142 return ret;
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143 }
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144
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145 static void cx_pl_reverse(struct cx_list_s *list) {
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146 list->climpl->reverse(list);
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147 }
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148
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149 static void *cx_pl_iter_current(void const *it) {
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150 struct cx_iterator_s const *iter = it;
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151 void **ptr = iter->base.current_impl(it);
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152 return ptr == NULL ? NULL : *ptr;
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153 }
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154
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155 static struct cx_iterator_s cx_pl_iterator(
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156 struct cx_list_s const *list,
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157 size_t index,
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158 bool backwards
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159 ) {
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160 struct cx_iterator_s iter = list->climpl->iterator(list, index, backwards);
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161 iter.base.current_impl = iter.base.current;
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162 iter.base.current = cx_pl_iter_current;
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163 return iter;
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164 }
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165
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166 static cx_list_class cx_pointer_list_class = {
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167 cx_pl_destructor,
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168 cx_pl_insert_element,
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169 cx_pl_insert_array,
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170 cx_pl_insert_iter,
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171 cx_pl_remove,
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172 cx_pl_clear,
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173 cx_pl_swap,
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174 cx_pl_at,
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175 cx_pl_find_remove,
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176 cx_pl_sort,
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177 cx_pl_compare,
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178 cx_pl_reverse,
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179 cx_pl_iterator,
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180 };
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181
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182 void cxListStoreObjects(CxList *list) {
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183 list->store_pointer = false;
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184 if (list->climpl != NULL) {
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185 list->cl = list->climpl;
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186 list->climpl = NULL;
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187 }
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188 }
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189
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190 void cxListStorePointers(CxList *list) {
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191 list->item_size = sizeof(void *);
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192 list->store_pointer = true;
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193 list->climpl = list->cl;
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194 list->cl = &cx_pointer_list_class;
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195 }
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196
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197 // </editor-fold>
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198
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199 // <editor-fold desc="empty list implementation">
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200
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201 static void cx_emptyl_noop(__attribute__((__unused__)) CxList *list) {
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202 // this is a noop, but MUST be implemented
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203 }
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204
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205 static void *cx_emptyl_at(
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206 __attribute__((__unused__)) struct cx_list_s const *list,
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207 __attribute__((__unused__)) size_t index
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208 ) {
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209 return NULL;
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210 }
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211
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212 static ssize_t cx_emptyl_find_remove(
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213 __attribute__((__unused__)) struct cx_list_s *list,
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214 __attribute__((__unused__)) void const *elem,
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215 __attribute__((__unused__)) bool remove
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216 ) {
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217 return -1;
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218 }
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219
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220 static int cx_emptyl_compare(
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221 __attribute__((__unused__)) struct cx_list_s const *list,
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222 struct cx_list_s const *other
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223 ) {
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224 if (other->size == 0) return 0;
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225 return -1;
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226 }
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227
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228 static bool cx_emptyl_iter_valid(__attribute__((__unused__)) void const *iter) {
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229 return false;
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230 }
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231
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232 static CxIterator cx_emptyl_iterator(
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233 struct cx_list_s const *list,
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234 size_t index,
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235 __attribute__((__unused__)) bool backwards
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236 ) {
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237 CxIterator iter = {0};
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238 iter.src_handle = list;
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239 iter.index = index;
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240 iter.base.valid = cx_emptyl_iter_valid;
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241 return iter;
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242 }
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243
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244 static cx_list_class cx_empty_list_class = {
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245 cx_emptyl_noop,
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246 NULL,
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247 NULL,
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248 NULL,
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249 NULL,
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250 cx_emptyl_noop,
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251 NULL,
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252 cx_emptyl_at,
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253 cx_emptyl_find_remove,
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254 cx_emptyl_noop,
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255 cx_emptyl_compare,
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256 cx_emptyl_noop,
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257 cx_emptyl_iterator,
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258 };
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259
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260 CxList cx_empty_list = {
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261 NULL,
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262 NULL,
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263 0,
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264 0,
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265 NULL,
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266 NULL,
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267 NULL,
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268 false,
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269 &cx_empty_list_class,
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270 NULL
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271 };
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272
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273 CxList *const cxEmptyList = &cx_empty_list;
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274
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275 // </editor-fold>
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276
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277 void cxListDestroy(CxList *list) {
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278 list->cl->destructor(list);
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279 }
618
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280
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281 int cxListCompare(
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282 CxList const *list,
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283 CxList const *other
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284 ) {
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285 if (
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286 // if one is storing pointers but the other is not
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287 (list->store_pointer ^ other->store_pointer) ||
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288
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289 // if one class is wrapped but the other is not
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290 ((list->climpl == NULL) ^ (other->climpl == NULL)) ||
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291
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292 // if the resolved compare functions are not the same
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293 ((list->climpl != NULL ? list->climpl->compare : list->cl->compare) !=
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294 (other->climpl != NULL ? other->climpl->compare : other->cl->compare))
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295 ) {
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296 // lists are definitely different - cannot use internal compare function
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297 if (list->size == other->size) {
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298 CxIterator left = list->cl->iterator(list, 0, false);
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299 CxIterator right = other->cl->iterator(other, 0, false);
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300 for (size_t i = 0; i < list->size; i++) {
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301 void *leftValue = cxIteratorCurrent(left);
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302 void *rightValue = cxIteratorCurrent(right);
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303 int d = list->cmpfunc(leftValue, rightValue);
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304 if (d != 0) {
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305 return d;
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306 }
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307 cxIteratorNext(left);
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308 cxIteratorNext(right);
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309 }
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310 return 0;
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311 } else {
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312 return list->size < other->size ? -1 : 1;
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313 }
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314 } else {
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315 // lists are compatible
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316 return list->cl->compare(list, other);
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317 }
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318 }
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319
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320 CxMutIterator cxListMutIteratorAt(
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321 CxList *list,
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322 size_t index
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323 ) {
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324 CxIterator it = list->cl->iterator(list, index, false);
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325 it.base.mutating = true;
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326
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327 // we know the iterators share the same memory layout
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328 CxMutIterator iter;
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329 memcpy(&iter, &it, sizeof(CxMutIterator));
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330 return iter;
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331 }
655
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332
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333 CxMutIterator cxListMutBackwardsIteratorAt(
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334 CxList *list,
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335 size_t index
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336 ) {
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337 CxIterator it = list->cl->iterator(list, index, true);
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338 it.base.mutating = true;
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339
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340 // we know the iterators share the same memory layout
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341 CxMutIterator iter;
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342 memcpy(&iter, &it, sizeof(CxMutIterator));
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343 return iter;
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344 }

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