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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">// vi:set ft=cpp: -*- Mode: C++ -*-</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">/*</span></div>
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<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> * Copyright (C) 2015, 2017, 2024 Kernkonzept GmbH.</span></div>
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<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> * Author(s): Sarah Hoffmann <sarah.hoffmann@kernkonzept.com></span></div>
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<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> * Alexander Warg <alexander.warg@kernkonzept.com></span></div>
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<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> *</span></div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> * License: see LICENSE.spdx (in this directory or the directories above)</span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> */</span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#pragma once</span></div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span> </div>
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<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="preprocessor">#include "hlist"</span></div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span> </div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespacecxx.html">cxx</a> {</div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span></div>
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<div class="foldopen" id="foldopen00024" data-start="{" data-end="};">
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"><a class="line" href="classcxx_1_1Weak__ref__base.html"> 24</a></span><span class="keyword">class </span>Weak_ref_base : <span class="keyword">public</span> <a class="code hl_function" href="classcxx_1_1H__list__item__t.html#a386713e30171daa23a74e55ccd294382">H_list_item_t</a><Weak_ref_base></div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span>{</div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="keyword">protected</span>:</div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> Weak_ref_base(<span class="keywordtype">void</span> <span class="keyword">const</span> *ptr = <span class="keyword">nullptr</span>) : _obj(ptr) {}</div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> <span class="keywordtype">void</span> reset_hard() { _obj = <span class="keyword">nullptr</span>; }</div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> <span class="keywordtype">void</span> <span class="keyword">const</span> *_obj;</div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> </div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="keyword">public</span>:</div>
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<div class="foldopen" id="foldopen00038" data-start="{" data-end="};">
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"><a class="line" href="structcxx_1_1Weak__ref__base_1_1List.html"> 38</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structcxx_1_1Weak__ref__base_1_1List.html">List</a> : H_list_t<Weak_ref_base></div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> {</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <span class="keywordtype">void</span> reset()</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> {</div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <span class="keywordflow">while</span> (!<a class="code hl_function" href="classcxx_1_1Bits_1_1Basic__list.html#a18b55807a5a50a2dc3e3eacb18d9b436">empty</a>())</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <a class="code hl_function" href="classcxx_1_1H__list.html#a35ba3d02d38eee050c821a782df9b871">pop_front</a>()->reset_hard();</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> }</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> </div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <a class="code hl_struct" href="structcxx_1_1Weak__ref__base_1_1List.html">~List</a>()</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> { reset(); }</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> };</div>
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</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> </div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="keyword">explicit</span> <span class="keyword">operator</span> bool ()<span class="keyword"> const</span></div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span><span class="keyword"> </span>{ <span class="keywordflow">return</span> _obj ? true : <span class="keyword">false</span>; }</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span>};</div>
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</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> </div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span></div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span><span class="keyword">template</span> <<span class="keyword">typename</span> T></div>
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<div class="foldopen" id="foldopen00095" data-start="{" data-end="};">
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"><a class="line" href="classcxx_1_1Weak__ref.html"> 95</a></span><span class="keyword">class </span>Weak_ref : <span class="keyword">public</span> Weak_ref_base</div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span>{</div>
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span><span class="keyword">public</span>:</div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> T *get()<span class="keyword"> const</span></div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span><span class="keyword"> </span>{ <span class="keywordflow">return</span> <span class="keyword">reinterpret_cast<</span>T*<span class="keyword">></span>(<span class="keyword">const_cast<</span><span class="keywordtype">void</span> *<span class="keyword">></span>(_obj)); }</div>
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<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> </div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> T *reset(T *n)</div>
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> {</div>
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<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> T *r = get();</div>
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<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> <span class="keywordflow">if</span> (r)</div>
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<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> r->remove_weak_ref(<span class="keyword">this</span>);</div>
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<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> </div>
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<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> _obj = n;</div>
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<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> <span class="keywordflow">if</span> (n)</div>
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<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> n->add_weak_ref(<span class="keyword">this</span>);</div>
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<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> </div>
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<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> <span class="keywordflow">return</span> r;</div>
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<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> }</div>
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<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> </div>
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<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> Weak_ref(T *s = <span class="keyword">nullptr</span>) : Weak_ref_base(s)</div>
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<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> {</div>
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<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> <span class="keywordflow">if</span> (s)</div>
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<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> s->add_weak_ref(<span class="keyword">this</span>);</div>
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<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> }</div>
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<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> </div>
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<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> ~Weak_ref() { reset(0); }</div>
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<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> </div>
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<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> <span class="keywordtype">void</span> operator = (T *n)</div>
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<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> { reset(n); }</div>
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<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> </div>
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<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> Weak_ref(Weak_ref <span class="keyword">const</span> &o) : Weak_ref_base(o._obj)</div>
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<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> {</div>
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<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> <span class="keywordflow">if</span> (T *x = get())</div>
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<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> x->add_weak_ref(<span class="keyword">this</span>);</div>
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<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> }</div>
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<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> </div>
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<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> Weak_ref &operator = (Weak_ref <span class="keyword">const</span> &o)</div>
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<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> {</div>
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<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> <span class="keywordflow">if</span> (&o == <span class="keyword">this</span>)</div>
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<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
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<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> </div>
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<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> reset(o.get());</div>
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<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
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<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> }</div>
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<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> </div>
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<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> T &operator * ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> get(); }</div>
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<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> T *operator -> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> get(); }</div>
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<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span>};</div>
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</div>
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<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> </div>
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<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span><span class="keyword">class </span>Weak_ref_obj</div>
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<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span>{</div>
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<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span><span class="keyword">protected</span>:</div>
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<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keyword">friend</span> <span class="keyword">class </span><a class="code hl_class" href="classcxx_1_1Weak__ref.html">Weak_ref</a>;</div>
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<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> <span class="keyword">mutable</span> <a class="code hl_struct" href="structcxx_1_1Weak__ref__base_1_1List.html">Weak_ref_base::List</a> weak_references;</div>
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<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> </div>
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<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> <span class="keywordtype">void</span> add_weak_ref(<a class="code hl_class" href="classcxx_1_1Weak__ref__base.html">Weak_ref_base</a> *ref)<span class="keyword"> const</span></div>
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<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span><span class="keyword"> </span>{ weak_references.<a class="code hl_function" href="classcxx_1_1H__list.html#afa48e56b417c420b88b7494ce3e791d6">push_front</a>(ref); }</div>
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<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> </div>
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<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> <span class="keywordtype">void</span> remove_weak_ref(Weak_ref_base *ref)<span class="keyword"> const</span></div>
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<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span><span class="keyword"> </span>{ weak_references.<a class="code hl_function" href="classcxx_1_1H__list.html#abc13d604f76c1da4ea72c30c1302835d">remove</a>(ref); }</div>
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<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span>};</div>
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<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> </div>
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<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span>}</div>
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<div class="ttc" id="aclasscxx_1_1Bits_1_1Basic__list_html_a18b55807a5a50a2dc3e3eacb18d9b436"><div class="ttname"><a href="classcxx_1_1Bits_1_1Basic__list.html#a18b55807a5a50a2dc3e3eacb18d9b436">cxx::Bits::Basic_list< Bits::Basic_list_policy< Weak_ref_base, H_list_item_t< Weak_ref_base > > >::empty</a></div><div class="ttdeci">bool empty() const</div><div class="ttdef"><b>Definition</b> <a href="list__basics_8h_source.html#l00126">list_basics.h:126</a></div></div>
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<div class="ttc" id="aclasscxx_1_1H__list__item__t_html_a386713e30171daa23a74e55ccd294382"><div class="ttname"><a href="classcxx_1_1H__list__item__t.html#a386713e30171daa23a74e55ccd294382">cxx::H_list_item_t< Weak_ref_base >::H_list_item_t</a></div><div class="ttdeci">H_list_item_t()</div><div class="ttdef"><b>Definition</b> <a href="hlist_source.html#l00030">hlist:30</a></div></div>
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<div class="ttc" id="aclasscxx_1_1H__list_html_a35ba3d02d38eee050c821a782df9b871"><div class="ttname"><a href="classcxx_1_1H__list.html#a35ba3d02d38eee050c821a782df9b871">cxx::H_list< Weak_ref_base, Bits::Basic_list_policy< Weak_ref_base, H_list_item_t< Weak_ref_base > > >::pop_front</a></div><div class="ttdeci">Weak_ref_base * pop_front()</div><div class="ttdef"><b>Definition</b> <a href="hlist_source.html#l00116">hlist:116</a></div></div>
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<div class="ttc" id="aclasscxx_1_1H__list_html_abc13d604f76c1da4ea72c30c1302835d"><div class="ttname"><a href="classcxx_1_1H__list.html#abc13d604f76c1da4ea72c30c1302835d">cxx::H_list::remove</a></div><div class="ttdeci">static void remove(T *e)</div><div class="ttdoc">Remove the given element from its list.</div><div class="ttdef"><b>Definition</b> <a href="hlist_source.html#l00220">hlist:220</a></div></div>
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<div class="ttc" id="aclasscxx_1_1H__list_html_afa48e56b417c420b88b7494ce3e791d6"><div class="ttname"><a href="classcxx_1_1H__list.html#afa48e56b417c420b88b7494ce3e791d6">cxx::H_list::push_front</a></div><div class="ttdeci">void push_front(T *e)</div><div class="ttdoc">Add element to the front of the list.</div><div class="ttdef"><b>Definition</b> <a href="hlist_source.html#l00109">hlist:109</a></div></div>
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<div class="ttc" id="aclasscxx_1_1Weak__ref__base_html"><div class="ttname"><a href="classcxx_1_1Weak__ref__base.html">cxx::Weak_ref_base</a></div><div class="ttdoc">Generic (base) weak reference to some object.</div><div class="ttdef"><b>Definition</b> <a href="#l00024">weak_ref:25</a></div></div>
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<div class="ttc" id="aclasscxx_1_1Weak__ref_html"><div class="ttname"><a href="classcxx_1_1Weak__ref.html">cxx::Weak_ref</a></div><div class="ttdoc">Typed weak reference to an object of type T.</div><div class="ttdef"><b>Definition</b> <a href="#l00095">weak_ref:96</a></div></div>
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<div class="ttc" id="anamespacecxx_html"><div class="ttname"><a href="namespacecxx.html">cxx</a></div><div class="ttdoc">Our C++ library.</div><div class="ttdef"><b>Definition</b> <a href="arith_source.html#l00011">arith:11</a></div></div>
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<div class="ttc" id="astructcxx_1_1Weak__ref__base_1_1List_html"><div class="ttname"><a href="structcxx_1_1Weak__ref__base_1_1List.html">cxx::Weak_ref_base::List</a></div><div class="ttdoc">The list type for keeping all weak references to an object.</div><div class="ttdef"><b>Definition</b> <a href="#l00038">weak_ref:39</a></div></div>
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<li class="navelem"><b>l4</b></li><li class="navelem"><b>cxx</b></li><li class="navelem"><b>weak_ref</b></li>
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