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<a href="a00506.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// shared_ptr and weak_ptr implementation details -*- C++ -*-</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Copyright (C) 2007-2018 Free Software Foundation, Inc.</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// This file is part of the GNU ISO C++ Library. This library is free</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// software; you can redistribute it and/or modify it under the</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// terms of the GNU General Public License as published by the</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Free Software Foundation; either version 3, or (at your option)</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// any later version.</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// This library is distributed in the hope that it will be useful,</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// GNU General Public License for more details.</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// Under Section 7 of GPL version 3, you are granted additional</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// permissions described in the GCC Runtime Library Exception, version</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// 3.1, as published by the Free Software Foundation.</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// You should have received a copy of the GNU General Public License and</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// a copy of the GCC Runtime Library Exception along with this program;</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// <http://www.gnu.org/licenses/>.</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">// GCC Note: Based on files from version 1.32.0 of the Boost library.</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">// shared_count.hpp</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">// shared_ptr.hpp</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">// Copyright (C) 1998, 1999 Greg Colvin and Beman Dawes.</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">// Copyright (C) 2001, 2002, 2003 Peter Dimov</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// weak_ptr.hpp</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// Copyright (C) 2001, 2002, 2003 Peter Dimov</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">// enable_shared_from_this.hpp</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment">// Copyright (C) 2002 Peter Dimov</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">// Distributed under the Boost Software License, Version 1.0. (See</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment">// accompanying file LICENSE_1_0.txt or copy at</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment">// http://www.boost.org/LICENSE_1_0.txt)</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"></span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment">/** @file bits/shared_ptr_base.h</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> * This is an internal header file, included by other library headers.</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> * Do not attempt to use it directly. @headername{memory}</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> */</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> </div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor">#ifndef _SHARED_PTR_BASE_H</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor">#define _SHARED_PTR_BASE_H 1</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor">#include <<a class="code" href="a00035.html">typeinfo</a>></span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor">#include <<a class="code" href="a00269.html">bits/allocated_ptr.h</a>></span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="preprocessor">#include <<a class="code" href="a00461.html">bits/refwrap.h</a>></span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="preprocessor">#include <<a class="code" href="a00542.html">bits/stl_function.h</a>></span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor">#include <<a class="code" href="a01016.html">ext/aligned_buffer.h</a>></span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="keyword">namespace </span><a class="code" href="a01538.html">std</a> _GLIBCXX_VISIBILITY(default)</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> {</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="preprocessor">#if _GLIBCXX_USE_DEPRECATED</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="preprocessor">#pragma GCC diagnostic push</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor">#pragma GCC diagnostic ignored "-Wdeprecated-declarations"</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">template</span><<span class="keyword">typename</span>> <span class="keyword">class </span>auto_ptr;</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="preprocessor">#pragma GCC diagnostic pop</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"></span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"> /**</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> * @brief Exception possibly thrown by @c shared_ptr.</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> * @ingroup exceptions</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> */</span></div><div class="line"><a name="l00073"></a><span class="lineno"><a class="line" href="a06888.html"> 73</a></span>  <span class="keyword">class </span><a class="code" href="a06888.html">bad_weak_ptr</a> : <span class="keyword">public</span> <a class="code" href="a05424.html">std::exception</a></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  {</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keyword">virtual</span> <span class="keywordtype">char</span> <span class="keyword">const</span>* <a class="code" href="a06888.html#adfea1fffacfb8c9c39f374e16ec7315c">what</a>() <span class="keyword">const</span> noexcept;</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keyword">virtual</span> ~<a class="code" href="a06888.html">bad_weak_ptr</a>() noexcept;</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  };</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="comment">// Substitute for bad_weak_ptr object in the case of -fno-exceptions.</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  __throw_bad_weak_ptr()</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  { _GLIBCXX_THROW_OR_ABORT(<a class="code" href="a06888.html">bad_weak_ptr</a>()); }</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> </div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keyword">using</span> __gnu_cxx::_Lock_policy;</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keyword">using</span> __gnu_cxx::__default_lock_policy;</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keyword">using</span> __gnu_cxx::_S_single;</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keyword">using</span> __gnu_cxx::_S_mutex;</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keyword">using</span> __gnu_cxx::_S_atomic;</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">// Empty helper class except when the template argument is _S_mutex.</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keyword">template</span><_Lock_policy _Lp></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keyword">class </span>_Mutex_base</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  {</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keyword">protected</span>:</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="comment">// The atomic policy uses fully-fenced builtins, single doesn't care.</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keyword">enum</span> { _S_need_barriers = 0 };</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  };</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keyword">class </span>_Mutex_base<_S_mutex></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  : <span class="keyword">public</span> __gnu_cxx::__mutex</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  {</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keyword">protected</span>:</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="comment">// This policy is used when atomic builtins are not available.</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="comment">// The replacement atomic operations might not have the necessary</span></div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="comment">// memory barriers.</span></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keyword">enum</span> { _S_need_barriers = 1 };</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  };</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keyword">template</span><_Lock_policy _Lp = __default_lock_policy></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keyword">class </span>_Sp_counted_base</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  : <span class="keyword">public</span> _Mutex_base<_Lp></div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  {</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  _Sp_counted_base() noexcept</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  : _M_use_count(1), _M_weak_count(1) { }</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> </div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keyword">virtual</span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  ~_Sp_counted_base() noexcept</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  { }</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> </div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="comment">// Called when _M_use_count drops to zero, to release the resources</span></div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="comment">// managed by *this.</span></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  _M_dispose() noexcept = 0;</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> </div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="comment">// Called when _M_weak_count drops to zero.</span></div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  virtual <span class="keywordtype">void</span></div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  _M_destroy() noexcept</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  { <span class="keyword">delete</span> <span class="keyword">this</span>; }</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> </div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span>*</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  _M_get_deleter(<span class="keyword">const</span> <a class="code" href="a01668.html">std::type_info</a>&) noexcept = 0;</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> </div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  _M_add_ref_copy()</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  { __gnu_cxx::__atomic_add_dispatch(&_M_use_count, 1); }</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> </div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  _M_add_ref_lock();</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> </div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  _M_add_ref_lock_nothrow();</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  _M_release() noexcept</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  {</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="comment">// Be race-detector-friendly. For more info see bits/c++config.</span></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_use_count);</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">if</span> (__gnu_cxx::__exchange_and_add_dispatch(&_M_use_count, -1) == 1)</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  {</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_use_count);</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  _M_dispose();</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="comment">// There must be a memory barrier between dispose() and destroy()</span></div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="comment">// to ensure that the effects of dispose() are observed in the</span></div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="comment">// thread that runs destroy().</span></div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="comment">// See http://gcc.gnu.org/ml/libstdc++/2005-11/msg00136.html</span></div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">if</span> (_Mutex_base<_Lp>::_S_need_barriers)</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  {</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  __atomic_thread_fence (__ATOMIC_ACQ_REL);</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  }</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span> </div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="comment">// Be race-detector-friendly. For more info see bits/c++config.</span></div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_weak_count);</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keywordflow">if</span> (__gnu_cxx::__exchange_and_add_dispatch(&_M_weak_count,</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  -1) == 1)</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  {</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_weak_count);</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  _M_destroy();</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  }</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  }</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  }</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span> </div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  _M_weak_add_ref() noexcept</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  { __gnu_cxx::__atomic_add_dispatch(&_M_weak_count, 1); }</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span> </div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  _M_weak_release() noexcept</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  {</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="comment">// Be race-detector-friendly. For more info see bits/c++config.</span></div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_weak_count);</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="keywordflow">if</span> (__gnu_cxx::__exchange_and_add_dispatch(&_M_weak_count, -1) == 1)</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  {</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_weak_count);</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keywordflow">if</span> (_Mutex_base<_Lp>::_S_need_barriers)</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  {</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="comment">// See _M_release(),</span></div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="comment">// destroy() must observe results of dispose()</span></div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  __atomic_thread_fence (__ATOMIC_ACQ_REL);</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  }</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  _M_destroy();</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  }</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  }</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span> </div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="keywordtype">long</span></div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  _M_get_use_count() const noexcept</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  {</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="comment">// No memory barrier is used here so there is no synchronization</span></div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="comment">// with other threads.</span></div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">return</span> __atomic_load_n(&_M_use_count, __ATOMIC_RELAXED);</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  }</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  _Sp_counted_base(_Sp_counted_base <span class="keyword">const</span>&) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  _Sp_counted_base& operator=(_Sp_counted_base <span class="keyword">const</span>&) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span> </div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  _Atomic_word _M_use_count; <span class="comment">// #shared</span></div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  _Atomic_word _M_weak_count; <span class="comment">// #weak + (#shared != 0)</span></div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  };</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span> </div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  _Sp_counted_base<_S_single>::</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  _M_add_ref_lock()</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  {</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keywordflow">if</span> (_M_use_count == 0)</div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  __throw_bad_weak_ptr();</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  ++_M_use_count;</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  }</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span> </div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  _Sp_counted_base<_S_mutex>::</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  _M_add_ref_lock()</div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  {</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <a class="code" href="a10280.html">__gnu_cxx::__scoped_lock</a> sentry(*<span class="keyword">this</span>);</div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="keywordflow">if</span> (__gnu_cxx::__exchange_and_add_dispatch(&_M_use_count, 1) == 0)</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  {</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  _M_use_count = 0;</div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  __throw_bad_weak_ptr();</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  }</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  }</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span> </div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  _Sp_counted_base<_S_atomic>::</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  _M_add_ref_lock()</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  {</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="comment">// Perform lock-free add-if-not-zero operation.</span></div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  _Atomic_word __count = _M_get_use_count();</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="keywordflow">do</span></div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  {</div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keywordflow">if</span> (__count == 0)</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  __throw_bad_weak_ptr();</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="comment">// Replace the current counter value with the old value + 1, as</span></div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="comment">// long as it's not changed meanwhile.</span></div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  }</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="keywordflow">while</span> (!__atomic_compare_exchange_n(&_M_use_count, &__count, __count + 1,</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="keyword">true</span>, __ATOMIC_ACQ_REL,</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  __ATOMIC_RELAXED));</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  }</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span> </div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  _Sp_counted_base<_S_single>::</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  _M_add_ref_lock_nothrow()</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  {</div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <span class="keywordflow">if</span> (_M_use_count == 0)</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  ++_M_use_count;</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  }</div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span> </div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  _Sp_counted_base<_S_mutex>::</div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  _M_add_ref_lock_nothrow()</div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  {</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <a class="code" href="a10280.html">__gnu_cxx::__scoped_lock</a> sentry(*<span class="keyword">this</span>);</div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keywordflow">if</span> (__gnu_cxx::__exchange_and_add_dispatch(&_M_use_count, 1) == 0)</div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  {</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  _M_use_count = 0;</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  }</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  }</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span> </div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  _Sp_counted_base<_S_atomic>::</div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  _M_add_ref_lock_nothrow()</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  {</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <span class="comment">// Perform lock-free add-if-not-zero operation.</span></div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  _Atomic_word __count = _M_get_use_count();</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="keywordflow">do</span></div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  {</div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  <span class="keywordflow">if</span> (__count == 0)</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="comment">// Replace the current counter value with the old value + 1, as</span></div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  <span class="comment">// long as it's not changed meanwhile.</span></div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  }</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="keywordflow">while</span> (!__atomic_compare_exchange_n(&_M_use_count, &__count, __count + 1,</div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="keyword">true</span>, __ATOMIC_ACQ_REL,</div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  __ATOMIC_RELAXED));</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  }</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span> </div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  _Sp_counted_base<_S_single>::_M_add_ref_copy()</div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  { ++_M_use_count; }</div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span> </div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  _Sp_counted_base<_S_single>::_M_release() noexcept</div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  {</div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  <span class="keywordflow">if</span> (--_M_use_count == 0)</div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  {</div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  _M_dispose();</div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  <span class="keywordflow">if</span> (--_M_weak_count == 0)</div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  _M_destroy();</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  }</div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  }</div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span> </div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  _Sp_counted_base<_S_single>::_M_weak_add_ref() noexcept</div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  { ++_M_weak_count; }</div><div class="line"><a name="l00322"></a><span class="lineno"> 322</span> </div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  _Sp_counted_base<_S_single>::_M_weak_release() noexcept</div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  {</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  <span class="keywordflow">if</span> (--_M_weak_count == 0)</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  _M_destroy();</div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  }</div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span> </div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  <span class="keyword">inline</span> <span class="keywordtype">long</span></div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  _Sp_counted_base<_S_single>::_M_get_use_count() const noexcept</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  { <span class="keywordflow">return</span> _M_use_count; }</div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span> </div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span> </div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  <span class="comment">// Forward declarations.</span></div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp = __default_lock_policy></div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  <span class="keyword">class </span>__shared_ptr;</div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span> </div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp = __default_lock_policy></div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  <span class="keyword">class </span>__weak_ptr;</div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span> </div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp = __default_lock_policy></div><div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  <span class="keyword">class </span>__enable_shared_from_this;</div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span> </div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  <span class="keyword">class </span>shared_ptr;</div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span> </div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  <span class="keyword">class </span>weak_ptr;</div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span> </div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  <span class="keyword">struct </span>owner_less;</div><div class="line"><a name="l00355"></a><span class="lineno"> 355</span> </div><div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keyword">class </span>enable_shared_from_this;</div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span> </div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  <span class="keyword">template</span><_Lock_policy _Lp = __default_lock_policy></div><div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  <span class="keyword">class </span>__weak_count;</div><div class="line"><a name="l00361"></a><span class="lineno"> 361</span> </div><div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  <span class="keyword">template</span><_Lock_policy _Lp = __default_lock_policy></div><div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  <span class="keyword">class </span>__shared_count;</div><div class="line"><a name="l00364"></a><span class="lineno"> 364</span> </div><div class="line"><a name="l00365"></a><span class="lineno"> 365</span> </div><div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  <span class="comment">// Counted ptr with no deleter or allocator support</span></div><div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Ptr, _Lock_policy _Lp></div><div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  <span class="keyword">class </span>_Sp_counted_ptr final : <span class="keyword">public</span> _Sp_counted_base<_Lp></div><div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  {</div><div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <span class="keyword">explicit</span></div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  _Sp_counted_ptr(_Ptr __p) noexcept</div><div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  : _M_ptr(__p) { }</div><div class="line"><a name="l00374"></a><span class="lineno"> 374</span> </div><div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  _M_dispose() noexcept</div><div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  { <span class="keyword">delete</span> _M_ptr; }</div><div class="line"><a name="l00378"></a><span class="lineno"> 378</span> </div><div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  _M_destroy() noexcept</div><div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  { <span class="keyword">delete</span> <span class="keyword">this</span>; }</div><div class="line"><a name="l00382"></a><span class="lineno"> 382</span> </div><div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span>*</div><div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  _M_get_deleter(<span class="keyword">const</span> <a class="code" href="a01668.html">std::type_info</a>&) noexcept</div><div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  { <span class="keywordflow">return</span> <span class="keyword">nullptr</span>; }</div><div class="line"><a name="l00386"></a><span class="lineno"> 386</span> </div><div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  _Sp_counted_ptr(<span class="keyword">const</span> _Sp_counted_ptr&) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  _Sp_counted_ptr& operator=(<span class="keyword">const</span> _Sp_counted_ptr&) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00389"></a><span class="lineno"> 389</span> </div><div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  _Ptr _M_ptr;</div><div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  };</div><div class="line"><a name="l00393"></a><span class="lineno"> 393</span> </div><div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  _Sp_counted_ptr<nullptr_t, _S_single>::_M_dispose() noexcept { }</div><div class="line"><a name="l00397"></a><span class="lineno"> 397</span> </div><div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  _Sp_counted_ptr<nullptr_t, _S_mutex>::_M_dispose() noexcept { }</div><div class="line"><a name="l00401"></a><span class="lineno"> 401</span> </div><div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  _Sp_counted_ptr<nullptr_t, _S_atomic>::_M_dispose() noexcept { }</div><div class="line"><a name="l00405"></a><span class="lineno"> 405</span> </div><div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  <span class="keyword">template</span><<span class="keywordtype">int</span> _Nm, <span class="keyword">typename</span> _Tp,</div><div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  <span class="keywordtype">bool</span> __use_ebo = !__is_final(_Tp) && __is_empty(_Tp)></div><div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  <span class="keyword">struct </span>_Sp_ebo_helper;</div><div class="line"><a name="l00409"></a><span class="lineno"> 409</span> <span class="comment"></span></div><div class="line"><a name="l00410"></a><span class="lineno"> 410</span> <span class="comment"> /// Specialization using EBO.</span></div><div class="line"><a name="l00411"></a><span class="lineno"> 411</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keywordtype">int</span> _Nm, <span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00412"></a><span class="lineno"><a class="line" href="a06932.html"> 412</a></span>  <span class="keyword">struct </span>_Sp_ebo_helper<_Nm, _Tp, true> : <span class="keyword">private</span> _Tp</div><div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  {</div><div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  <span class="keyword">explicit</span> _Sp_ebo_helper(<span class="keyword">const</span> _Tp& __tp) : _Tp(__tp) { }</div><div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  <span class="keyword">explicit</span> _Sp_ebo_helper(_Tp&& __tp) : _Tp(std::move(__tp)) { }</div><div class="line"><a name="l00416"></a><span class="lineno"> 416</span> </div><div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  <span class="keyword">static</span> _Tp&</div><div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  _S_get(_Sp_ebo_helper& __eboh) { <span class="keywordflow">return</span> static_cast<_Tp&>(__eboh); }</div><div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  };</div><div class="line"><a name="l00420"></a><span class="lineno"> 420</span> <span class="comment"></span></div><div class="line"><a name="l00421"></a><span class="lineno"> 421</span> <span class="comment"> /// Specialization not using EBO.</span></div><div class="line"><a name="l00422"></a><span class="lineno"> 422</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keywordtype">int</span> _Nm, <span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00423"></a><span class="lineno"><a class="line" href="a06936.html"> 423</a></span>  <span class="keyword">struct </span>_Sp_ebo_helper<_Nm, _Tp, false></div><div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  {</div><div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  <span class="keyword">explicit</span> _Sp_ebo_helper(<span class="keyword">const</span> _Tp& __tp) : _M_tp(__tp) { }</div><div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  <span class="keyword">explicit</span> _Sp_ebo_helper(_Tp&& __tp) : _M_tp(std::move(__tp)) { }</div><div class="line"><a name="l00427"></a><span class="lineno"> 427</span> </div><div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  <span class="keyword">static</span> _Tp&</div><div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  _S_get(_Sp_ebo_helper& __eboh)</div><div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  { <span class="keywordflow">return</span> __eboh._M_tp; }</div><div class="line"><a name="l00431"></a><span class="lineno"> 431</span> </div><div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  _Tp _M_tp;</div><div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  };</div><div class="line"><a name="l00435"></a><span class="lineno"> 435</span> </div><div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  <span class="comment">// Support for custom deleter and/or allocator</span></div><div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Ptr, <span class="keyword">typename</span> _Deleter, <span class="keyword">typename</span> _Alloc, _Lock_policy _Lp></div><div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  <span class="keyword">class </span>_Sp_counted_deleter final : <span class="keyword">public</span> _Sp_counted_base<_Lp></div><div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  {</div><div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  <span class="keyword">class </span>_Impl : _Sp_ebo_helper<0, _Deleter>, _Sp_ebo_helper<1, _Alloc></div><div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  {</div><div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  <span class="keyword">typedef</span> _Sp_ebo_helper<0, _Deleter> _Del_base;</div><div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  <span class="keyword">typedef</span> _Sp_ebo_helper<1, _Alloc> _Alloc_base;</div><div class="line"><a name="l00444"></a><span class="lineno"> 444</span> </div><div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  _Impl(_Ptr __p, _Deleter __d, <span class="keyword">const</span> _Alloc& __a) noexcept</div><div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  : _M_ptr(__p), _Del_base(std::move(__d)), _Alloc_base(__a)</div><div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  { }</div><div class="line"><a name="l00449"></a><span class="lineno"> 449</span> </div><div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  _Deleter& _M_del() noexcept { <span class="keywordflow">return</span> _Del_base::_S_get(*<span class="keyword">this</span>); }</div><div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  _Alloc& _M_alloc() noexcept { <span class="keywordflow">return</span> _Alloc_base::_S_get(*<span class="keyword">this</span>); }</div><div class="line"><a name="l00452"></a><span class="lineno"> 452</span> </div><div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  _Ptr _M_ptr;</div><div class="line"><a name="l00454"></a><span class="lineno"> 454</span>  };</div><div class="line"><a name="l00455"></a><span class="lineno"> 455</span> </div><div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  <span class="keyword">using</span> __allocator_type = __alloc_rebind<_Alloc, _Sp_counted_deleter>;</div><div class="line"><a name="l00458"></a><span class="lineno"> 458</span> </div><div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  <span class="comment">// __d(__p) must not throw.</span></div><div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  _Sp_counted_deleter(_Ptr __p, _Deleter __d) noexcept</div><div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  : _M_impl(__p, std::move(__d), _Alloc()) { }</div><div class="line"><a name="l00462"></a><span class="lineno"> 462</span> </div><div class="line"><a name="l00463"></a><span class="lineno"> 463</span>  <span class="comment">// __d(__p) must not throw.</span></div><div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  _Sp_counted_deleter(_Ptr __p, _Deleter __d, <span class="keyword">const</span> _Alloc& __a) noexcept</div><div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  : _M_impl(__p, std::move(__d), __a) { }</div><div class="line"><a name="l00466"></a><span class="lineno"> 466</span> </div><div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  ~_Sp_counted_deleter() noexcept { }</div><div class="line"><a name="l00468"></a><span class="lineno"> 468</span> </div><div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  _M_dispose() noexcept</div><div class="line"><a name="l00471"></a><span class="lineno"> 471</span>  { _M_impl._M_del()(_M_impl._M_ptr); }</div><div class="line"><a name="l00472"></a><span class="lineno"> 472</span> </div><div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  _M_destroy() noexcept</div><div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  {</div><div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  __allocator_type __a(_M_impl._M_alloc());</div><div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  __allocated_ptr<__allocator_type> __guard_ptr{ __a, <span class="keyword">this</span> };</div><div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  this->~_Sp_counted_deleter();</div><div class="line"><a name="l00479"></a><span class="lineno"> 479</span>  }</div><div class="line"><a name="l00480"></a><span class="lineno"> 480</span> </div><div class="line"><a name="l00481"></a><span class="lineno"> 481</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span>*</div><div class="line"><a name="l00482"></a><span class="lineno"> 482</span>  _M_get_deleter(<span class="keyword">const</span> <a class="code" href="a01668.html">std::type_info</a>& __ti) noexcept</div><div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  {</div><div class="line"><a name="l00484"></a><span class="lineno"> 484</span> <span class="preprocessor">#if __cpp_rtti</span></div><div class="line"><a name="l00485"></a><span class="lineno"> 485</span>  <span class="comment">// _GLIBCXX_RESOLVE_LIB_DEFECTS</span></div><div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  <span class="comment">// 2400. shared_ptr's get_deleter() should use addressof()</span></div><div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  <span class="keywordflow">return</span> __ti == <span class="keyword">typeid</span>(_Deleter)</div><div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  ? <a class="code" href="a01477.html#ga1954d5552e24586051011312041033f6">std::__addressof</a>(_M_impl._M_del())</div><div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  : <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00490"></a><span class="lineno"> 490</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00491"></a><span class="lineno"> 491</span>  <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00492"></a><span class="lineno"> 492</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  }</div><div class="line"><a name="l00494"></a><span class="lineno"> 494</span> </div><div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  _Impl _M_impl;</div><div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  };</div><div class="line"><a name="l00498"></a><span class="lineno"> 498</span> </div><div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  <span class="comment">// helpers for make_shared / allocate_shared</span></div><div class="line"><a name="l00500"></a><span class="lineno"> 500</span> </div><div class="line"><a name="l00501"></a><span class="lineno"> 501</span>  <span class="keyword">struct </span>_Sp_make_shared_tag</div><div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  {</div><div class="line"><a name="l00503"></a><span class="lineno"> 503</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00504"></a><span class="lineno"> 504</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Alloc, _Lock_policy _Lp></div><div class="line"><a name="l00505"></a><span class="lineno"> 505</span>  <span class="keyword">friend</span> <span class="keyword">class </span>_Sp_counted_ptr_inplace;</div><div class="line"><a name="l00506"></a><span class="lineno"> 506</span> </div><div class="line"><a name="l00507"></a><span class="lineno"> 507</span>  <span class="keyword">static</span> <span class="keyword">const</span> type_info&</div><div class="line"><a name="l00508"></a><span class="lineno"> 508</span>  _S_ti() noexcept _GLIBCXX_VISIBILITY(default)</div><div class="line"><a name="l00509"></a><span class="lineno"> 509</span>  {</div><div class="line"><a name="l00510"></a><span class="lineno"> 510</span>  <span class="keyword">alignas</span>(type_info) <span class="keyword">static</span> constexpr <span class="keywordtype">char</span> __tag[<span class="keyword">sizeof</span>(type_info)] = { };</div><div class="line"><a name="l00511"></a><span class="lineno"> 511</span>  <span class="keywordflow">return</span> reinterpret_cast<const type_info&>(__tag);</div><div class="line"><a name="l00512"></a><span class="lineno"> 512</span>  }</div><div class="line"><a name="l00513"></a><span class="lineno"> 513</span>  };</div><div class="line"><a name="l00514"></a><span class="lineno"> 514</span> </div><div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Alloc></div><div class="line"><a name="l00516"></a><span class="lineno"> 516</span>  <span class="keyword">struct </span>_Sp_alloc_shared_tag</div><div class="line"><a name="l00517"></a><span class="lineno"> 517</span>  {</div><div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  <span class="keyword">const</span> _Alloc& _M_a;</div><div class="line"><a name="l00519"></a><span class="lineno"> 519</span>  };</div><div class="line"><a name="l00520"></a><span class="lineno"> 520</span> </div><div class="line"><a name="l00521"></a><span class="lineno"> 521</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Alloc, _Lock_policy _Lp></div><div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  <span class="keyword">class </span>_Sp_counted_ptr_inplace final : <span class="keyword">public</span> _Sp_counted_base<_Lp></div><div class="line"><a name="l00523"></a><span class="lineno"> 523</span>  {</div><div class="line"><a name="l00524"></a><span class="lineno"> 524</span>  <span class="keyword">class </span>_Impl : _Sp_ebo_helper<0, _Alloc></div><div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  {</div><div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  <span class="keyword">typedef</span> _Sp_ebo_helper<0, _Alloc> _A_base;</div><div class="line"><a name="l00527"></a><span class="lineno"> 527</span> </div><div class="line"><a name="l00528"></a><span class="lineno"> 528</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  <span class="keyword">explicit</span> _Impl(_Alloc __a) noexcept : _A_base(__a) { }</div><div class="line"><a name="l00530"></a><span class="lineno"> 530</span> </div><div class="line"><a name="l00531"></a><span class="lineno"> 531</span>  _Alloc& _M_alloc() noexcept { <span class="keywordflow">return</span> _A_base::_S_get(*<span class="keyword">this</span>); }</div><div class="line"><a name="l00532"></a><span class="lineno"> 532</span> </div><div class="line"><a name="l00533"></a><span class="lineno"> 533</span>  __gnu_cxx::__aligned_buffer<_Tp> _M_storage;</div><div class="line"><a name="l00534"></a><span class="lineno"> 534</span>  };</div><div class="line"><a name="l00535"></a><span class="lineno"> 535</span> </div><div class="line"><a name="l00536"></a><span class="lineno"> 536</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00537"></a><span class="lineno"> 537</span>  <span class="keyword">using</span> __allocator_type = __alloc_rebind<_Alloc, _Sp_counted_ptr_inplace>;</div><div class="line"><a name="l00538"></a><span class="lineno"> 538</span> </div><div class="line"><a name="l00539"></a><span class="lineno"> 539</span>  <span class="keyword">template</span><<span class="keyword">typename</span>... _Args></div><div class="line"><a name="l00540"></a><span class="lineno"> 540</span>  _Sp_counted_ptr_inplace(_Alloc __a, _Args&&... __args)</div><div class="line"><a name="l00541"></a><span class="lineno"> 541</span>  : _M_impl(__a)</div><div class="line"><a name="l00542"></a><span class="lineno"> 542</span>  {</div><div class="line"><a name="l00543"></a><span class="lineno"> 543</span>  <span class="comment">// _GLIBCXX_RESOLVE_LIB_DEFECTS</span></div><div class="line"><a name="l00544"></a><span class="lineno"> 544</span>  <span class="comment">// 2070. allocate_shared should use allocator_traits<A>::construct</span></div><div class="line"><a name="l00545"></a><span class="lineno"> 545</span>  <a class="code" href="a04636.html#aad7d7b8604439d1ecf953a1b9a426e7b">allocator_traits<_Alloc>::construct</a>(__a, _M_ptr(),</div><div class="line"><a name="l00546"></a><span class="lineno"> 546</span>  std::forward<_Args>(__args)...); <span class="comment">// might throw</span></div><div class="line"><a name="l00547"></a><span class="lineno"> 547</span>  }</div><div class="line"><a name="l00548"></a><span class="lineno"> 548</span> </div><div class="line"><a name="l00549"></a><span class="lineno"> 549</span>  ~_Sp_counted_ptr_inplace() noexcept { }</div><div class="line"><a name="l00550"></a><span class="lineno"> 550</span> </div><div class="line"><a name="l00551"></a><span class="lineno"> 551</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00552"></a><span class="lineno"> 552</span>  _M_dispose() noexcept</div><div class="line"><a name="l00553"></a><span class="lineno"> 553</span>  {</div><div class="line"><a name="l00554"></a><span class="lineno"> 554</span>  <a class="code" href="a04636.html#ac73f3d164cf01c9d61b44d42c30db3d3">allocator_traits<_Alloc>::destroy</a>(_M_impl._M_alloc(), _M_ptr());</div><div class="line"><a name="l00555"></a><span class="lineno"> 555</span>  }</div><div class="line"><a name="l00556"></a><span class="lineno"> 556</span> </div><div class="line"><a name="l00557"></a><span class="lineno"> 557</span>  <span class="comment">// Override because the allocator needs to know the dynamic type</span></div><div class="line"><a name="l00558"></a><span class="lineno"> 558</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00559"></a><span class="lineno"> 559</span>  _M_destroy() noexcept</div><div class="line"><a name="l00560"></a><span class="lineno"> 560</span>  {</div><div class="line"><a name="l00561"></a><span class="lineno"> 561</span>  __allocator_type __a(_M_impl._M_alloc());</div><div class="line"><a name="l00562"></a><span class="lineno"> 562</span>  __allocated_ptr<__allocator_type> __guard_ptr{ __a, <span class="keyword">this</span> };</div><div class="line"><a name="l00563"></a><span class="lineno"> 563</span>  this->~_Sp_counted_ptr_inplace();</div><div class="line"><a name="l00564"></a><span class="lineno"> 564</span>  }</div><div class="line"><a name="l00565"></a><span class="lineno"> 565</span> </div><div class="line"><a name="l00566"></a><span class="lineno"> 566</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00567"></a><span class="lineno"> 567</span>  <span class="keyword">friend</span> <span class="keyword">class </span>__shared_count<_Lp>; <span class="comment">// To be able to call _M_ptr().</span></div><div class="line"><a name="l00568"></a><span class="lineno"> 568</span> </div><div class="line"><a name="l00569"></a><span class="lineno"> 569</span>  <span class="comment">// No longer used, but code compiled against old libstdc++ headers</span></div><div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  <span class="comment">// might still call it from __shared_ptr ctor to get the pointer out.</span></div><div class="line"><a name="l00571"></a><span class="lineno"> 571</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span>*</div><div class="line"><a name="l00572"></a><span class="lineno"> 572</span>  _M_get_deleter(<span class="keyword">const</span> <a class="code" href="a01668.html">std::type_info</a>& __ti) noexcept <span class="keyword">override</span></div><div class="line"><a name="l00573"></a><span class="lineno"> 573</span>  {</div><div class="line"><a name="l00574"></a><span class="lineno"> 574</span>  <span class="comment">// Check for the fake type_info first, so we don't try to access it</span></div><div class="line"><a name="l00575"></a><span class="lineno"> 575</span>  <span class="comment">// as a real type_info object.</span></div><div class="line"><a name="l00576"></a><span class="lineno"> 576</span>  <span class="keywordflow">if</span> (&__ti == &_Sp_make_shared_tag::_S_ti())</div><div class="line"><a name="l00577"></a><span class="lineno"> 577</span>  <span class="keywordflow">return</span> <span class="keyword">const_cast<</span>typename remove_cv<_Tp>::type*<span class="keyword">></span>(_M_ptr());</div><div class="line"><a name="l00578"></a><span class="lineno"> 578</span> <span class="preprocessor">#if __cpp_rtti</span></div><div class="line"><a name="l00579"></a><span class="lineno"> 579</span>  <span class="comment">// Callers compiled with old libstdc++ headers and RTTI enabled</span></div><div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  <span class="comment">// might pass this instead:</span></div><div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__ti == <span class="keyword">typeid</span>(_Sp_make_shared_tag))</div><div class="line"><a name="l00582"></a><span class="lineno"> 582</span>  <span class="keywordflow">return</span> <span class="keyword">const_cast<</span>typename remove_cv<_Tp>::type*<span class="keyword">></span>(_M_ptr());</div><div class="line"><a name="l00583"></a><span class="lineno"> 583</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  <span class="comment">// Cannot detect a real type_info object. If the linker keeps a</span></div><div class="line"><a name="l00585"></a><span class="lineno"> 585</span>  <span class="comment">// definition of this function compiled with -fno-rtti then callers</span></div><div class="line"><a name="l00586"></a><span class="lineno"> 586</span>  <span class="comment">// that have RTTI enabled and pass a real type_info object will get</span></div><div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  <span class="comment">// a null pointer returned.</span></div><div class="line"><a name="l00588"></a><span class="lineno"> 588</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00589"></a><span class="lineno"> 589</span>  <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00590"></a><span class="lineno"> 590</span>  }</div><div class="line"><a name="l00591"></a><span class="lineno"> 591</span> </div><div class="line"><a name="l00592"></a><span class="lineno"> 592</span>  _Tp* _M_ptr() noexcept { <span class="keywordflow">return</span> _M_impl._M_storage._M_ptr(); }</div><div class="line"><a name="l00593"></a><span class="lineno"> 593</span> </div><div class="line"><a name="l00594"></a><span class="lineno"> 594</span>  _Impl _M_impl;</div><div class="line"><a name="l00595"></a><span class="lineno"> 595</span>  };</div><div class="line"><a name="l00596"></a><span class="lineno"> 596</span> </div><div class="line"><a name="l00597"></a><span class="lineno"> 597</span>  <span class="comment">// The default deleter for shared_ptr<T[]> and shared_ptr<T[N]>.</span></div><div class="line"><a name="l00598"></a><span class="lineno"> 598</span>  <span class="keyword">struct </span>__sp_array_delete</div><div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  {</div><div class="line"><a name="l00600"></a><span class="lineno"> 600</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l00601"></a><span class="lineno"> 601</span>  <span class="keywordtype">void</span> operator()(_Yp* __p)<span class="keyword"> const </span>{ <span class="keyword">delete</span>[] __p; }</div><div class="line"><a name="l00602"></a><span class="lineno"> 602</span>  };</div><div class="line"><a name="l00603"></a><span class="lineno"> 603</span> </div><div class="line"><a name="l00604"></a><span class="lineno"> 604</span>  <span class="keyword">template</span><_Lock_policy _Lp></div><div class="line"><a name="l00605"></a><span class="lineno"> 605</span>  <span class="keyword">class </span>__shared_count</div><div class="line"><a name="l00606"></a><span class="lineno"> 606</span>  {</div><div class="line"><a name="l00607"></a><span class="lineno"> 607</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00608"></a><span class="lineno"> 608</span>  <span class="keyword">struct </span>__not_alloc_shared_tag { <span class="keyword">using</span> type = void; };</div><div class="line"><a name="l00609"></a><span class="lineno"> 609</span> </div><div class="line"><a name="l00610"></a><span class="lineno"> 610</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00611"></a><span class="lineno"> 611</span>  <span class="keyword">struct </span>__not_alloc_shared_tag<_Sp_alloc_shared_tag<_Tp>> { };</div><div class="line"><a name="l00612"></a><span class="lineno"> 612</span> </div><div class="line"><a name="l00613"></a><span class="lineno"> 613</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00614"></a><span class="lineno"> 614</span>  constexpr __shared_count() noexcept : _M_pi(0)</div><div class="line"><a name="l00615"></a><span class="lineno"> 615</span>  { }</div><div class="line"><a name="l00616"></a><span class="lineno"> 616</span> </div><div class="line"><a name="l00617"></a><span class="lineno"> 617</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Ptr></div><div class="line"><a name="l00618"></a><span class="lineno"> 618</span>  <span class="keyword">explicit</span></div><div class="line"><a name="l00619"></a><span class="lineno"> 619</span>  __shared_count(_Ptr __p) : _M_pi(0)</div><div class="line"><a name="l00620"></a><span class="lineno"> 620</span>  {</div><div class="line"><a name="l00621"></a><span class="lineno"> 621</span>  __try</div><div class="line"><a name="l00622"></a><span class="lineno"> 622</span>  {</div><div class="line"><a name="l00623"></a><span class="lineno"> 623</span>  _M_pi = <span class="keyword">new</span> _Sp_counted_ptr<_Ptr, _Lp>(__p);</div><div class="line"><a name="l00624"></a><span class="lineno"> 624</span>  }</div><div class="line"><a name="l00625"></a><span class="lineno"> 625</span>  __catch(...)</div><div class="line"><a name="l00626"></a><span class="lineno"> 626</span>  {</div><div class="line"><a name="l00627"></a><span class="lineno"> 627</span>  <span class="keyword">delete</span> __p;</div><div class="line"><a name="l00628"></a><span class="lineno"> 628</span>  __throw_exception_again;</div><div class="line"><a name="l00629"></a><span class="lineno"> 629</span>  }</div><div class="line"><a name="l00630"></a><span class="lineno"> 630</span>  }</div><div class="line"><a name="l00631"></a><span class="lineno"> 631</span> </div><div class="line"><a name="l00632"></a><span class="lineno"> 632</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Ptr></div><div class="line"><a name="l00633"></a><span class="lineno"> 633</span>  __shared_count(_Ptr __p, <span class="comment">/* is_array = */</span> <a class="code" href="a01476.html#gaebe6729ab5488ecc76c762873d226857">false_type</a>)</div><div class="line"><a name="l00634"></a><span class="lineno"> 634</span>  : __shared_count(__p)</div><div class="line"><a name="l00635"></a><span class="lineno"> 635</span>  { }</div><div class="line"><a name="l00636"></a><span class="lineno"> 636</span> </div><div class="line"><a name="l00637"></a><span class="lineno"> 637</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Ptr></div><div class="line"><a name="l00638"></a><span class="lineno"> 638</span>  __shared_count(_Ptr __p, <span class="comment">/* is_array = */</span> <a class="code" href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">true_type</a>)</div><div class="line"><a name="l00639"></a><span class="lineno"> 639</span>  : __shared_count(__p, __sp_array_delete{}, allocator<void>())</div><div class="line"><a name="l00640"></a><span class="lineno"> 640</span>  { }</div><div class="line"><a name="l00641"></a><span class="lineno"> 641</span> </div><div class="line"><a name="l00642"></a><span class="lineno"> 642</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Ptr, <span class="keyword">typename</span> _Deleter,</div><div class="line"><a name="l00643"></a><span class="lineno"> 643</span>  <span class="keyword">typename</span> = <span class="keyword">typename</span> __not_alloc_shared_tag<_Deleter>::type></div><div class="line"><a name="l00644"></a><span class="lineno"> 644</span>  __shared_count(_Ptr __p, _Deleter __d)</div><div class="line"><a name="l00645"></a><span class="lineno"> 645</span>  : __shared_count(__p, <a class="code" href="a01538.html">std</a>::move(__d), allocator<void>())</div><div class="line"><a name="l00646"></a><span class="lineno"> 646</span>  { }</div><div class="line"><a name="l00647"></a><span class="lineno"> 647</span> </div><div class="line"><a name="l00648"></a><span class="lineno"> 648</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Ptr, <span class="keyword">typename</span> _Deleter, <span class="keyword">typename</span> _Alloc,</div><div class="line"><a name="l00649"></a><span class="lineno"> 649</span>  <span class="keyword">typename</span> = <span class="keyword">typename</span> __not_alloc_shared_tag<_Deleter>::type></div><div class="line"><a name="l00650"></a><span class="lineno"> 650</span>  __shared_count(_Ptr __p, _Deleter __d, _Alloc __a) : _M_pi(0)</div><div class="line"><a name="l00651"></a><span class="lineno"> 651</span>  {</div><div class="line"><a name="l00652"></a><span class="lineno"> 652</span>  <span class="keyword">typedef</span> _Sp_counted_deleter<_Ptr, _Deleter, _Alloc, _Lp> _Sp_cd_type;</div><div class="line"><a name="l00653"></a><span class="lineno"> 653</span>  __try</div><div class="line"><a name="l00654"></a><span class="lineno"> 654</span>  {</div><div class="line"><a name="l00655"></a><span class="lineno"> 655</span>  <span class="keyword">typename</span> _Sp_cd_type::__allocator_type __a2(__a);</div><div class="line"><a name="l00656"></a><span class="lineno"> 656</span>  <span class="keyword">auto</span> __guard = <a class="code" href="a01538.html#a1fa3f7679aec1619e37fddf24eb70a11">std::__allocate_guarded</a>(__a2);</div><div class="line"><a name="l00657"></a><span class="lineno"> 657</span>  _Sp_cd_type* __mem = __guard.get();</div><div class="line"><a name="l00658"></a><span class="lineno"> 658</span>  ::new (__mem) _Sp_cd_type(__p, std::move(__d), std::move(__a));</div><div class="line"><a name="l00659"></a><span class="lineno"> 659</span>  _M_pi = __mem;</div><div class="line"><a name="l00660"></a><span class="lineno"> 660</span>  __guard = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00661"></a><span class="lineno"> 661</span>  }</div><div class="line"><a name="l00662"></a><span class="lineno"> 662</span>  __catch(...)</div><div class="line"><a name="l00663"></a><span class="lineno"> 663</span>  {</div><div class="line"><a name="l00664"></a><span class="lineno"> 664</span>  __d(__p); <span class="comment">// Call _Deleter on __p.</span></div><div class="line"><a name="l00665"></a><span class="lineno"> 665</span>  __throw_exception_again;</div><div class="line"><a name="l00666"></a><span class="lineno"> 666</span>  }</div><div class="line"><a name="l00667"></a><span class="lineno"> 667</span>  }</div><div class="line"><a name="l00668"></a><span class="lineno"> 668</span> </div><div class="line"><a name="l00669"></a><span class="lineno"> 669</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Alloc, <span class="keyword">typename</span>... _Args></div><div class="line"><a name="l00670"></a><span class="lineno"> 670</span>  __shared_count(_Tp*& __p, _Sp_alloc_shared_tag<_Alloc> __a,</div><div class="line"><a name="l00671"></a><span class="lineno"> 671</span>  _Args&&... __args)</div><div class="line"><a name="l00672"></a><span class="lineno"> 672</span>  {</div><div class="line"><a name="l00673"></a><span class="lineno"> 673</span>  <span class="keyword">typedef</span> _Sp_counted_ptr_inplace<_Tp, _Alloc, _Lp> _Sp_cp_type;</div><div class="line"><a name="l00674"></a><span class="lineno"> 674</span>  <span class="keyword">typename</span> _Sp_cp_type::__allocator_type __a2(__a._M_a);</div><div class="line"><a name="l00675"></a><span class="lineno"> 675</span>  <span class="keyword">auto</span> __guard = <a class="code" href="a01538.html#a1fa3f7679aec1619e37fddf24eb70a11">std::__allocate_guarded</a>(__a2);</div><div class="line"><a name="l00676"></a><span class="lineno"> 676</span>  _Sp_cp_type* __mem = __guard.get();</div><div class="line"><a name="l00677"></a><span class="lineno"> 677</span>  <span class="keyword">auto</span> __pi = ::new (__mem)</div><div class="line"><a name="l00678"></a><span class="lineno"> 678</span>  _Sp_cp_type(__a._M_a, std::forward<_Args>(__args)...);</div><div class="line"><a name="l00679"></a><span class="lineno"> 679</span>  __guard = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00680"></a><span class="lineno"> 680</span>  _M_pi = __pi;</div><div class="line"><a name="l00681"></a><span class="lineno"> 681</span>  __p = __pi->_M_ptr();</div><div class="line"><a name="l00682"></a><span class="lineno"> 682</span>  }</div><div class="line"><a name="l00683"></a><span class="lineno"> 683</span> </div><div class="line"><a name="l00684"></a><span class="lineno"> 684</span> <span class="preprocessor">#if _GLIBCXX_USE_DEPRECATED</span></div><div class="line"><a name="l00685"></a><span class="lineno"> 685</span> <span class="preprocessor">#pragma GCC diagnostic push</span></div><div class="line"><a name="l00686"></a><span class="lineno"> 686</span> <span class="preprocessor">#pragma GCC diagnostic ignored "-Wdeprecated-declarations"</span></div><div class="line"><a name="l00687"></a><span class="lineno"> 687</span>  <span class="comment">// Special case for auto_ptr<_Tp> to provide the strong guarantee.</span></div><div class="line"><a name="l00688"></a><span class="lineno"> 688</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00689"></a><span class="lineno"> 689</span>  <span class="keyword">explicit</span></div><div class="line"><a name="l00690"></a><span class="lineno"> 690</span>  __shared_count(<a class="code" href="a08452.html">std::auto_ptr<_Tp></a>&& __r);</div><div class="line"><a name="l00691"></a><span class="lineno"> 691</span> <span class="preprocessor">#pragma GCC diagnostic pop</span></div><div class="line"><a name="l00692"></a><span class="lineno"> 692</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00693"></a><span class="lineno"> 693</span> </div><div class="line"><a name="l00694"></a><span class="lineno"> 694</span>  <span class="comment">// Special case for unique_ptr<_Tp,_Del> to provide the strong guarantee.</span></div><div class="line"><a name="l00695"></a><span class="lineno"> 695</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Del></div><div class="line"><a name="l00696"></a><span class="lineno"> 696</span>  <span class="keyword">explicit</span></div><div class="line"><a name="l00697"></a><span class="lineno"> 697</span>  __shared_count(<a class="code" href="a07964.html">std::unique_ptr<_Tp, _Del></a>&& __r) : _M_pi(0)</div><div class="line"><a name="l00698"></a><span class="lineno"> 698</span>  {</div><div class="line"><a name="l00699"></a><span class="lineno"> 699</span>  <span class="comment">// _GLIBCXX_RESOLVE_LIB_DEFECTS</span></div><div class="line"><a name="l00700"></a><span class="lineno"> 700</span>  <span class="comment">// 2415. Inconsistency between unique_ptr and shared_ptr</span></div><div class="line"><a name="l00701"></a><span class="lineno"> 701</span>  <span class="keywordflow">if</span> (__r.get() == <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00702"></a><span class="lineno"> 702</span>  <span class="keywordflow">return</span>;</div><div class="line"><a name="l00703"></a><span class="lineno"> 703</span> </div><div class="line"><a name="l00704"></a><span class="lineno"> 704</span>  <span class="keyword">using</span> _Ptr = <span class="keyword">typename</span> unique_ptr<_Tp, _Del>::pointer;</div><div class="line"><a name="l00705"></a><span class="lineno"> 705</span>  <span class="keyword">using</span> _Del2 = <span class="keyword">typename</span> conditional<is_reference<_Del>::value,</div><div class="line"><a name="l00706"></a><span class="lineno"> 706</span>  reference_wrapper<typename remove_reference<_Del>::type>,</div><div class="line"><a name="l00707"></a><span class="lineno"> 707</span>  _Del>::type;</div><div class="line"><a name="l00708"></a><span class="lineno"> 708</span>  <span class="keyword">using</span> _Sp_cd_type</div><div class="line"><a name="l00709"></a><span class="lineno"> 709</span>  = _Sp_counted_deleter<_Ptr, _Del2, allocator<void>, _Lp>;</div><div class="line"><a name="l00710"></a><span class="lineno"> 710</span>  <span class="keyword">using</span> _Alloc = allocator<_Sp_cd_type>;</div><div class="line"><a name="l00711"></a><span class="lineno"> 711</span>  <span class="keyword">using</span> _Alloc_traits = allocator_traits<_Alloc>;</div><div class="line"><a name="l00712"></a><span class="lineno"> 712</span>  _Alloc __a;</div><div class="line"><a name="l00713"></a><span class="lineno"> 713</span>  _Sp_cd_type* __mem = _Alloc_traits::allocate(__a, 1);</div><div class="line"><a name="l00714"></a><span class="lineno"> 714</span>  _Alloc_traits::construct(__a, __mem, __r.release(),</div><div class="line"><a name="l00715"></a><span class="lineno"> 715</span>  __r.get_deleter()); <span class="comment">// non-throwing</span></div><div class="line"><a name="l00716"></a><span class="lineno"> 716</span>  _M_pi = __mem;</div><div class="line"><a name="l00717"></a><span class="lineno"> 717</span>  }</div><div class="line"><a name="l00718"></a><span class="lineno"> 718</span> </div><div class="line"><a name="l00719"></a><span class="lineno"> 719</span>  <span class="comment">// Throw bad_weak_ptr when __r._M_get_use_count() == 0.</span></div><div class="line"><a name="l00720"></a><span class="lineno"> 720</span>  <span class="keyword">explicit</span> __shared_count(<span class="keyword">const</span> __weak_count<_Lp>& __r);</div><div class="line"><a name="l00721"></a><span class="lineno"> 721</span> </div><div class="line"><a name="l00722"></a><span class="lineno"> 722</span>  <span class="comment">// Does not throw if __r._M_get_use_count() == 0, caller must check.</span></div><div class="line"><a name="l00723"></a><span class="lineno"> 723</span>  <span class="keyword">explicit</span> __shared_count(<span class="keyword">const</span> __weak_count<_Lp>& __r, std::nothrow_t);</div><div class="line"><a name="l00724"></a><span class="lineno"> 724</span> </div><div class="line"><a name="l00725"></a><span class="lineno"> 725</span>  ~__shared_count() noexcept</div><div class="line"><a name="l00726"></a><span class="lineno"> 726</span>  {</div><div class="line"><a name="l00727"></a><span class="lineno"> 727</span>  <span class="keywordflow">if</span> (_M_pi != <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00728"></a><span class="lineno"> 728</span>  _M_pi->_M_release();</div><div class="line"><a name="l00729"></a><span class="lineno"> 729</span>  }</div><div class="line"><a name="l00730"></a><span class="lineno"> 730</span> </div><div class="line"><a name="l00731"></a><span class="lineno"> 731</span>  __shared_count(<span class="keyword">const</span> __shared_count& __r) noexcept</div><div class="line"><a name="l00732"></a><span class="lineno"> 732</span>  : _M_pi(__r._M_pi)</div><div class="line"><a name="l00733"></a><span class="lineno"> 733</span>  {</div><div class="line"><a name="l00734"></a><span class="lineno"> 734</span>  <span class="keywordflow">if</span> (_M_pi != 0)</div><div class="line"><a name="l00735"></a><span class="lineno"> 735</span>  _M_pi->_M_add_ref_copy();</div><div class="line"><a name="l00736"></a><span class="lineno"> 736</span>  }</div><div class="line"><a name="l00737"></a><span class="lineno"> 737</span> </div><div class="line"><a name="l00738"></a><span class="lineno"> 738</span>  __shared_count&</div><div class="line"><a name="l00739"></a><span class="lineno"> 739</span>  operator=(<span class="keyword">const</span> __shared_count& __r) noexcept</div><div class="line"><a name="l00740"></a><span class="lineno"> 740</span>  {</div><div class="line"><a name="l00741"></a><span class="lineno"> 741</span>  _Sp_counted_base<_Lp>* __tmp = __r._M_pi;</div><div class="line"><a name="l00742"></a><span class="lineno"> 742</span>  <span class="keywordflow">if</span> (__tmp != _M_pi)</div><div class="line"><a name="l00743"></a><span class="lineno"> 743</span>  {</div><div class="line"><a name="l00744"></a><span class="lineno"> 744</span>  <span class="keywordflow">if</span> (__tmp != 0)</div><div class="line"><a name="l00745"></a><span class="lineno"> 745</span>  __tmp->_M_add_ref_copy();</div><div class="line"><a name="l00746"></a><span class="lineno"> 746</span>  <span class="keywordflow">if</span> (_M_pi != 0)</div><div class="line"><a name="l00747"></a><span class="lineno"> 747</span>  _M_pi->_M_release();</div><div class="line"><a name="l00748"></a><span class="lineno"> 748</span>  _M_pi = __tmp;</div><div class="line"><a name="l00749"></a><span class="lineno"> 749</span>  }</div><div class="line"><a name="l00750"></a><span class="lineno"> 750</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00751"></a><span class="lineno"> 751</span>  }</div><div class="line"><a name="l00752"></a><span class="lineno"> 752</span> </div><div class="line"><a name="l00753"></a><span class="lineno"> 753</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00754"></a><span class="lineno"> 754</span>  _M_swap(__shared_count& __r) noexcept</div><div class="line"><a name="l00755"></a><span class="lineno"> 755</span>  {</div><div class="line"><a name="l00756"></a><span class="lineno"> 756</span>  _Sp_counted_base<_Lp>* __tmp = __r._M_pi;</div><div class="line"><a name="l00757"></a><span class="lineno"> 757</span>  __r._M_pi = _M_pi;</div><div class="line"><a name="l00758"></a><span class="lineno"> 758</span>  _M_pi = __tmp;</div><div class="line"><a name="l00759"></a><span class="lineno"> 759</span>  }</div><div class="line"><a name="l00760"></a><span class="lineno"> 760</span> </div><div class="line"><a name="l00761"></a><span class="lineno"> 761</span>  <span class="keywordtype">long</span></div><div class="line"><a name="l00762"></a><span class="lineno"> 762</span>  _M_get_use_count() const noexcept</div><div class="line"><a name="l00763"></a><span class="lineno"> 763</span>  { <span class="keywordflow">return</span> _M_pi != 0 ? _M_pi->_M_get_use_count() : 0; }</div><div class="line"><a name="l00764"></a><span class="lineno"> 764</span> </div><div class="line"><a name="l00765"></a><span class="lineno"> 765</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l00766"></a><span class="lineno"> 766</span>  _M_unique() const noexcept</div><div class="line"><a name="l00767"></a><span class="lineno"> 767</span>  { <span class="keywordflow">return</span> this->_M_get_use_count() == 1; }</div><div class="line"><a name="l00768"></a><span class="lineno"> 768</span> </div><div class="line"><a name="l00769"></a><span class="lineno"> 769</span>  <span class="keywordtype">void</span>*</div><div class="line"><a name="l00770"></a><span class="lineno"> 770</span>  _M_get_deleter(<span class="keyword">const</span> <a class="code" href="a01668.html">std::type_info</a>& __ti) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l00771"></a><span class="lineno"> 771</span>  { <span class="keywordflow">return</span> _M_pi ? _M_pi->_M_get_deleter(__ti) : <span class="keyword">nullptr</span>; }</div><div class="line"><a name="l00772"></a><span class="lineno"> 772</span> </div><div class="line"><a name="l00773"></a><span class="lineno"> 773</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l00774"></a><span class="lineno"> 774</span>  _M_less(<span class="keyword">const</span> __shared_count& __rhs) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l00775"></a><span class="lineno"> 775</span>  { <span class="keywordflow">return</span> <a class="code" href="a07376.html">std::less<_Sp_counted_base<_Lp></a>*>()(this->_M_pi, __rhs._M_pi); }</div><div class="line"><a name="l00776"></a><span class="lineno"> 776</span> </div><div class="line"><a name="l00777"></a><span class="lineno"> 777</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l00778"></a><span class="lineno"> 778</span>  _M_less(<span class="keyword">const</span> __weak_count<_Lp>& __rhs) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l00779"></a><span class="lineno"> 779</span>  { <span class="keywordflow">return</span> <a class="code" href="a07376.html">std::less<_Sp_counted_base<_Lp></a>*>()(this->_M_pi, __rhs._M_pi); }</div><div class="line"><a name="l00780"></a><span class="lineno"> 780</span> </div><div class="line"><a name="l00781"></a><span class="lineno"> 781</span>  <span class="comment">// Friend function injected into enclosing namespace and found by ADL</span></div><div class="line"><a name="l00782"></a><span class="lineno"> 782</span>  <span class="keyword">friend</span> <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00783"></a><span class="lineno"> 783</span>  operator==(<span class="keyword">const</span> __shared_count& __a, <span class="keyword">const</span> __shared_count& __b) noexcept</div><div class="line"><a name="l00784"></a><span class="lineno"> 784</span>  { <span class="keywordflow">return</span> __a._M_pi == __b._M_pi; }</div><div class="line"><a name="l00785"></a><span class="lineno"> 785</span> </div><div class="line"><a name="l00786"></a><span class="lineno"> 786</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00787"></a><span class="lineno"> 787</span>  <span class="keyword">friend</span> <span class="keyword">class </span>__weak_count<_Lp>;</div><div class="line"><a name="l00788"></a><span class="lineno"> 788</span> </div><div class="line"><a name="l00789"></a><span class="lineno"> 789</span>  _Sp_counted_base<_Lp>* _M_pi;</div><div class="line"><a name="l00790"></a><span class="lineno"> 790</span>  };</div><div class="line"><a name="l00791"></a><span class="lineno"> 791</span> </div><div class="line"><a name="l00792"></a><span class="lineno"> 792</span> </div><div class="line"><a name="l00793"></a><span class="lineno"> 793</span>  <span class="keyword">template</span><_Lock_policy _Lp></div><div class="line"><a name="l00794"></a><span class="lineno"> 794</span>  <span class="keyword">class </span>__weak_count</div><div class="line"><a name="l00795"></a><span class="lineno"> 795</span>  {</div><div class="line"><a name="l00796"></a><span class="lineno"> 796</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00797"></a><span class="lineno"> 797</span>  constexpr __weak_count() noexcept : _M_pi(<span class="keywordtype">nullptr</span>)</div><div class="line"><a name="l00798"></a><span class="lineno"> 798</span>  { }</div><div class="line"><a name="l00799"></a><span class="lineno"> 799</span> </div><div class="line"><a name="l00800"></a><span class="lineno"> 800</span>  __weak_count(<span class="keyword">const</span> __shared_count<_Lp>& __r) noexcept</div><div class="line"><a name="l00801"></a><span class="lineno"> 801</span>  : _M_pi(__r._M_pi)</div><div class="line"><a name="l00802"></a><span class="lineno"> 802</span>  {</div><div class="line"><a name="l00803"></a><span class="lineno"> 803</span>  <span class="keywordflow">if</span> (_M_pi != <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00804"></a><span class="lineno"> 804</span>  _M_pi->_M_weak_add_ref();</div><div class="line"><a name="l00805"></a><span class="lineno"> 805</span>  }</div><div class="line"><a name="l00806"></a><span class="lineno"> 806</span> </div><div class="line"><a name="l00807"></a><span class="lineno"> 807</span>  __weak_count(<span class="keyword">const</span> __weak_count& __r) noexcept</div><div class="line"><a name="l00808"></a><span class="lineno"> 808</span>  : _M_pi(__r._M_pi)</div><div class="line"><a name="l00809"></a><span class="lineno"> 809</span>  {</div><div class="line"><a name="l00810"></a><span class="lineno"> 810</span>  <span class="keywordflow">if</span> (_M_pi != <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00811"></a><span class="lineno"> 811</span>  _M_pi->_M_weak_add_ref();</div><div class="line"><a name="l00812"></a><span class="lineno"> 812</span>  }</div><div class="line"><a name="l00813"></a><span class="lineno"> 813</span> </div><div class="line"><a name="l00814"></a><span class="lineno"> 814</span>  __weak_count(__weak_count&& __r) noexcept</div><div class="line"><a name="l00815"></a><span class="lineno"> 815</span>  : _M_pi(__r._M_pi)</div><div class="line"><a name="l00816"></a><span class="lineno"> 816</span>  { __r._M_pi = <span class="keyword">nullptr</span>; }</div><div class="line"><a name="l00817"></a><span class="lineno"> 817</span> </div><div class="line"><a name="l00818"></a><span class="lineno"> 818</span>  ~__weak_count() noexcept</div><div class="line"><a name="l00819"></a><span class="lineno"> 819</span>  {</div><div class="line"><a name="l00820"></a><span class="lineno"> 820</span>  <span class="keywordflow">if</span> (_M_pi != <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00821"></a><span class="lineno"> 821</span>  _M_pi->_M_weak_release();</div><div class="line"><a name="l00822"></a><span class="lineno"> 822</span>  }</div><div class="line"><a name="l00823"></a><span class="lineno"> 823</span> </div><div class="line"><a name="l00824"></a><span class="lineno"> 824</span>  __weak_count&</div><div class="line"><a name="l00825"></a><span class="lineno"> 825</span>  operator=(<span class="keyword">const</span> __shared_count<_Lp>& __r) noexcept</div><div class="line"><a name="l00826"></a><span class="lineno"> 826</span>  {</div><div class="line"><a name="l00827"></a><span class="lineno"> 827</span>  _Sp_counted_base<_Lp>* __tmp = __r._M_pi;</div><div class="line"><a name="l00828"></a><span class="lineno"> 828</span>  <span class="keywordflow">if</span> (__tmp != <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00829"></a><span class="lineno"> 829</span>  __tmp->_M_weak_add_ref();</div><div class="line"><a name="l00830"></a><span class="lineno"> 830</span>  <span class="keywordflow">if</span> (_M_pi != <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00831"></a><span class="lineno"> 831</span>  _M_pi->_M_weak_release();</div><div class="line"><a name="l00832"></a><span class="lineno"> 832</span>  _M_pi = __tmp;</div><div class="line"><a name="l00833"></a><span class="lineno"> 833</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00834"></a><span class="lineno"> 834</span>  }</div><div class="line"><a name="l00835"></a><span class="lineno"> 835</span> </div><div class="line"><a name="l00836"></a><span class="lineno"> 836</span>  __weak_count&</div><div class="line"><a name="l00837"></a><span class="lineno"> 837</span>  operator=(<span class="keyword">const</span> __weak_count& __r) noexcept</div><div class="line"><a name="l00838"></a><span class="lineno"> 838</span>  {</div><div class="line"><a name="l00839"></a><span class="lineno"> 839</span>  _Sp_counted_base<_Lp>* __tmp = __r._M_pi;</div><div class="line"><a name="l00840"></a><span class="lineno"> 840</span>  <span class="keywordflow">if</span> (__tmp != <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00841"></a><span class="lineno"> 841</span>  __tmp->_M_weak_add_ref();</div><div class="line"><a name="l00842"></a><span class="lineno"> 842</span>  <span class="keywordflow">if</span> (_M_pi != <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00843"></a><span class="lineno"> 843</span>  _M_pi->_M_weak_release();</div><div class="line"><a name="l00844"></a><span class="lineno"> 844</span>  _M_pi = __tmp;</div><div class="line"><a name="l00845"></a><span class="lineno"> 845</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00846"></a><span class="lineno"> 846</span>  }</div><div class="line"><a name="l00847"></a><span class="lineno"> 847</span> </div><div class="line"><a name="l00848"></a><span class="lineno"> 848</span>  __weak_count&</div><div class="line"><a name="l00849"></a><span class="lineno"> 849</span>  operator=(__weak_count&& __r) noexcept</div><div class="line"><a name="l00850"></a><span class="lineno"> 850</span>  {</div><div class="line"><a name="l00851"></a><span class="lineno"> 851</span>  <span class="keywordflow">if</span> (_M_pi != <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00852"></a><span class="lineno"> 852</span>  _M_pi->_M_weak_release();</div><div class="line"><a name="l00853"></a><span class="lineno"> 853</span>  _M_pi = __r._M_pi;</div><div class="line"><a name="l00854"></a><span class="lineno"> 854</span>  __r._M_pi = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00855"></a><span class="lineno"> 855</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00856"></a><span class="lineno"> 856</span>  }</div><div class="line"><a name="l00857"></a><span class="lineno"> 857</span> </div><div class="line"><a name="l00858"></a><span class="lineno"> 858</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00859"></a><span class="lineno"> 859</span>  _M_swap(__weak_count& __r) noexcept</div><div class="line"><a name="l00860"></a><span class="lineno"> 860</span>  {</div><div class="line"><a name="l00861"></a><span class="lineno"> 861</span>  _Sp_counted_base<_Lp>* __tmp = __r._M_pi;</div><div class="line"><a name="l00862"></a><span class="lineno"> 862</span>  __r._M_pi = _M_pi;</div><div class="line"><a name="l00863"></a><span class="lineno"> 863</span>  _M_pi = __tmp;</div><div class="line"><a name="l00864"></a><span class="lineno"> 864</span>  }</div><div class="line"><a name="l00865"></a><span class="lineno"> 865</span> </div><div class="line"><a name="l00866"></a><span class="lineno"> 866</span>  <span class="keywordtype">long</span></div><div class="line"><a name="l00867"></a><span class="lineno"> 867</span>  _M_get_use_count() const noexcept</div><div class="line"><a name="l00868"></a><span class="lineno"> 868</span>  { <span class="keywordflow">return</span> _M_pi != <span class="keyword">nullptr</span> ? _M_pi->_M_get_use_count() : 0; }</div><div class="line"><a name="l00869"></a><span class="lineno"> 869</span> </div><div class="line"><a name="l00870"></a><span class="lineno"> 870</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l00871"></a><span class="lineno"> 871</span>  _M_less(<span class="keyword">const</span> __weak_count& __rhs) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l00872"></a><span class="lineno"> 872</span>  { <span class="keywordflow">return</span> <a class="code" href="a07376.html">std::less<_Sp_counted_base<_Lp></a>*>()(this->_M_pi, __rhs._M_pi); }</div><div class="line"><a name="l00873"></a><span class="lineno"> 873</span> </div><div class="line"><a name="l00874"></a><span class="lineno"> 874</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l00875"></a><span class="lineno"> 875</span>  _M_less(<span class="keyword">const</span> __shared_count<_Lp>& __rhs) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l00876"></a><span class="lineno"> 876</span>  { <span class="keywordflow">return</span> <a class="code" href="a07376.html">std::less<_Sp_counted_base<_Lp></a>*>()(this->_M_pi, __rhs._M_pi); }</div><div class="line"><a name="l00877"></a><span class="lineno"> 877</span> </div><div class="line"><a name="l00878"></a><span class="lineno"> 878</span>  <span class="comment">// Friend function injected into enclosing namespace and found by ADL</span></div><div class="line"><a name="l00879"></a><span class="lineno"> 879</span>  <span class="keyword">friend</span> <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00880"></a><span class="lineno"> 880</span>  operator==(<span class="keyword">const</span> __weak_count& __a, <span class="keyword">const</span> __weak_count& __b) noexcept</div><div class="line"><a name="l00881"></a><span class="lineno"> 881</span>  { <span class="keywordflow">return</span> __a._M_pi == __b._M_pi; }</div><div class="line"><a name="l00882"></a><span class="lineno"> 882</span> </div><div class="line"><a name="l00883"></a><span class="lineno"> 883</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00884"></a><span class="lineno"> 884</span>  <span class="keyword">friend</span> <span class="keyword">class </span>__shared_count<_Lp>;</div><div class="line"><a name="l00885"></a><span class="lineno"> 885</span> </div><div class="line"><a name="l00886"></a><span class="lineno"> 886</span>  _Sp_counted_base<_Lp>* _M_pi;</div><div class="line"><a name="l00887"></a><span class="lineno"> 887</span>  };</div><div class="line"><a name="l00888"></a><span class="lineno"> 888</span> </div><div class="line"><a name="l00889"></a><span class="lineno"> 889</span>  <span class="comment">// Now that __weak_count is defined we can define this constructor:</span></div><div class="line"><a name="l00890"></a><span class="lineno"> 890</span>  <span class="keyword">template</span><_Lock_policy _Lp></div><div class="line"><a name="l00891"></a><span class="lineno"> 891</span>  <span class="keyword">inline</span></div><div class="line"><a name="l00892"></a><span class="lineno"> 892</span>  __shared_count<_Lp>::__shared_count(<span class="keyword">const</span> __weak_count<_Lp>& __r)</div><div class="line"><a name="l00893"></a><span class="lineno"> 893</span>  : _M_pi(__r._M_pi)</div><div class="line"><a name="l00894"></a><span class="lineno"> 894</span>  {</div><div class="line"><a name="l00895"></a><span class="lineno"> 895</span>  <span class="keywordflow">if</span> (_M_pi != <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00896"></a><span class="lineno"> 896</span>  _M_pi->_M_add_ref_lock();</div><div class="line"><a name="l00897"></a><span class="lineno"> 897</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00898"></a><span class="lineno"> 898</span>  __throw_bad_weak_ptr();</div><div class="line"><a name="l00899"></a><span class="lineno"> 899</span>  }</div><div class="line"><a name="l00900"></a><span class="lineno"> 900</span> </div><div class="line"><a name="l00901"></a><span class="lineno"> 901</span>  <span class="comment">// Now that __weak_count is defined we can define this constructor:</span></div><div class="line"><a name="l00902"></a><span class="lineno"> 902</span>  <span class="keyword">template</span><_Lock_policy _Lp></div><div class="line"><a name="l00903"></a><span class="lineno"> 903</span>  <span class="keyword">inline</span></div><div class="line"><a name="l00904"></a><span class="lineno"> 904</span>  __shared_count<_Lp>::</div><div class="line"><a name="l00905"></a><span class="lineno"> 905</span>  __shared_count(<span class="keyword">const</span> __weak_count<_Lp>& __r, std::nothrow_t)</div><div class="line"><a name="l00906"></a><span class="lineno"> 906</span>  : _M_pi(__r._M_pi)</div><div class="line"><a name="l00907"></a><span class="lineno"> 907</span>  {</div><div class="line"><a name="l00908"></a><span class="lineno"> 908</span>  <span class="keywordflow">if</span> (_M_pi != <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00909"></a><span class="lineno"> 909</span>  <span class="keywordflow">if</span> (!_M_pi->_M_add_ref_lock_nothrow())</div><div class="line"><a name="l00910"></a><span class="lineno"> 910</span>  _M_pi = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00911"></a><span class="lineno"> 911</span>  }</div><div class="line"><a name="l00912"></a><span class="lineno"> 912</span> </div><div class="line"><a name="l00913"></a><span class="lineno"> 913</span> <span class="preprocessor">#define __cpp_lib_shared_ptr_arrays 201603</span></div><div class="line"><a name="l00914"></a><span class="lineno"> 914</span> </div><div class="line"><a name="l00915"></a><span class="lineno"> 915</span>  <span class="comment">// Helper traits for shared_ptr of array:</span></div><div class="line"><a name="l00916"></a><span class="lineno"> 916</span> </div><div class="line"><a name="l00917"></a><span class="lineno"> 917</span>  <span class="comment">// A pointer type Y* is said to be compatible with a pointer type T* when</span></div><div class="line"><a name="l00918"></a><span class="lineno"> 918</span>  <span class="comment">// either Y* is convertible to T* or Y is U[N] and T is U cv [].</span></div><div class="line"><a name="l00919"></a><span class="lineno"> 919</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp_ptr, <span class="keyword">typename</span> _Tp_ptr></div><div class="line"><a name="l00920"></a><span class="lineno"> 920</span>  <span class="keyword">struct </span>__sp_compatible_with</div><div class="line"><a name="l00921"></a><span class="lineno"> 921</span>  : <a class="code" href="a01476.html#gaebe6729ab5488ecc76c762873d226857">false_type</a></div><div class="line"><a name="l00922"></a><span class="lineno"> 922</span>  { };</div><div class="line"><a name="l00923"></a><span class="lineno"> 923</span> </div><div class="line"><a name="l00924"></a><span class="lineno"> 924</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00925"></a><span class="lineno"> 925</span>  <span class="keyword">struct </span>__sp_compatible_with<_Yp*, _Tp*></div><div class="line"><a name="l00926"></a><span class="lineno"> 926</span>  : is_convertible<_Yp*, _Tp*>::type</div><div class="line"><a name="l00927"></a><span class="lineno"> 927</span>  { };</div><div class="line"><a name="l00928"></a><span class="lineno"> 928</span> </div><div class="line"><a name="l00929"></a><span class="lineno"> 929</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up, <span class="keywordtype">size_t</span> _Nm></div><div class="line"><a name="l00930"></a><span class="lineno"> 930</span>  <span class="keyword">struct </span>__sp_compatible_with<_Up(*)[_Nm], _Up(*)[]></div><div class="line"><a name="l00931"></a><span class="lineno"> 931</span>  : <a class="code" href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">true_type</a></div><div class="line"><a name="l00932"></a><span class="lineno"> 932</span>  { };</div><div class="line"><a name="l00933"></a><span class="lineno"> 933</span> </div><div class="line"><a name="l00934"></a><span class="lineno"> 934</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up, <span class="keywordtype">size_t</span> _Nm></div><div class="line"><a name="l00935"></a><span class="lineno"> 935</span>  <span class="keyword">struct </span>__sp_compatible_with<_Up(*)[_Nm], <span class="keyword">const</span> _Up(*)[]></div><div class="line"><a name="l00936"></a><span class="lineno"> 936</span>  : <a class="code" href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">true_type</a></div><div class="line"><a name="l00937"></a><span class="lineno"> 937</span>  { };</div><div class="line"><a name="l00938"></a><span class="lineno"> 938</span> </div><div class="line"><a name="l00939"></a><span class="lineno"> 939</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up, <span class="keywordtype">size_t</span> _Nm></div><div class="line"><a name="l00940"></a><span class="lineno"> 940</span>  <span class="keyword">struct </span>__sp_compatible_with<_Up(*)[_Nm], <span class="keyword">volatile</span> _Up(*)[]></div><div class="line"><a name="l00941"></a><span class="lineno"> 941</span>  : <a class="code" href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">true_type</a></div><div class="line"><a name="l00942"></a><span class="lineno"> 942</span>  { };</div><div class="line"><a name="l00943"></a><span class="lineno"> 943</span> </div><div class="line"><a name="l00944"></a><span class="lineno"> 944</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up, <span class="keywordtype">size_t</span> _Nm></div><div class="line"><a name="l00945"></a><span class="lineno"> 945</span>  <span class="keyword">struct </span>__sp_compatible_with<_Up(*)[_Nm], <span class="keyword">const</span> <span class="keyword">volatile</span> _Up(*)[]></div><div class="line"><a name="l00946"></a><span class="lineno"> 946</span>  : <a class="code" href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">true_type</a></div><div class="line"><a name="l00947"></a><span class="lineno"> 947</span>  { };</div><div class="line"><a name="l00948"></a><span class="lineno"> 948</span> </div><div class="line"><a name="l00949"></a><span class="lineno"> 949</span>  <span class="comment">// Test conversion from Y(*)[N] to U(*)[N] without forming invalid type Y[N].</span></div><div class="line"><a name="l00950"></a><span class="lineno"> 950</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up, <span class="keywordtype">size_t</span> _Nm, <span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = <span class="keywordtype">void</span>></div><div class="line"><a name="l00951"></a><span class="lineno"> 951</span>  <span class="keyword">struct </span>__sp_is_constructible_arrN</div><div class="line"><a name="l00952"></a><span class="lineno"> 952</span>  : <a class="code" href="a01476.html#gaebe6729ab5488ecc76c762873d226857">false_type</a></div><div class="line"><a name="l00953"></a><span class="lineno"> 953</span>  { };</div><div class="line"><a name="l00954"></a><span class="lineno"> 954</span> </div><div class="line"><a name="l00955"></a><span class="lineno"> 955</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up, <span class="keywordtype">size_t</span> _Nm, <span class="keyword">typename</span> _Yp></div><div class="line"><a name="l00956"></a><span class="lineno"> 956</span>  <span class="keyword">struct </span>__sp_is_constructible_arrN<_Up, _Nm, _Yp, __void_t<_Yp[_Nm]>></div><div class="line"><a name="l00957"></a><span class="lineno"> 957</span>  : is_convertible<_Yp(*)[_Nm], _Up(*)[_Nm]>::type</div><div class="line"><a name="l00958"></a><span class="lineno"> 958</span>  { };</div><div class="line"><a name="l00959"></a><span class="lineno"> 959</span> </div><div class="line"><a name="l00960"></a><span class="lineno"> 960</span>  <span class="comment">// Test conversion from Y(*)[] to U(*)[] without forming invalid type Y[].</span></div><div class="line"><a name="l00961"></a><span class="lineno"> 961</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up, <span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = <span class="keywordtype">void</span>></div><div class="line"><a name="l00962"></a><span class="lineno"> 962</span>  <span class="keyword">struct </span>__sp_is_constructible_arr</div><div class="line"><a name="l00963"></a><span class="lineno"> 963</span>  : <a class="code" href="a01476.html#gaebe6729ab5488ecc76c762873d226857">false_type</a></div><div class="line"><a name="l00964"></a><span class="lineno"> 964</span>  { };</div><div class="line"><a name="l00965"></a><span class="lineno"> 965</span> </div><div class="line"><a name="l00966"></a><span class="lineno"> 966</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up, <span class="keyword">typename</span> _Yp></div><div class="line"><a name="l00967"></a><span class="lineno"> 967</span>  <span class="keyword">struct </span>__sp_is_constructible_arr<_Up, _Yp, __void_t<_Yp[]>></div><div class="line"><a name="l00968"></a><span class="lineno"> 968</span>  : is_convertible<_Yp(*)[], _Up(*)[]>::type</div><div class="line"><a name="l00969"></a><span class="lineno"> 969</span>  { };</div><div class="line"><a name="l00970"></a><span class="lineno"> 970</span> </div><div class="line"><a name="l00971"></a><span class="lineno"> 971</span>  <span class="comment">// Trait to check if shared_ptr<T> can be constructed from Y*.</span></div><div class="line"><a name="l00972"></a><span class="lineno"> 972</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Yp></div><div class="line"><a name="l00973"></a><span class="lineno"> 973</span>  <span class="keyword">struct </span>__sp_is_constructible;</div><div class="line"><a name="l00974"></a><span class="lineno"> 974</span> </div><div class="line"><a name="l00975"></a><span class="lineno"> 975</span>  <span class="comment">// When T is U[N], Y(*)[N] shall be convertible to T*;</span></div><div class="line"><a name="l00976"></a><span class="lineno"> 976</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up, <span class="keywordtype">size_t</span> _Nm, <span class="keyword">typename</span> _Yp></div><div class="line"><a name="l00977"></a><span class="lineno"> 977</span>  <span class="keyword">struct </span>__sp_is_constructible<_Up[_Nm], _Yp></div><div class="line"><a name="l00978"></a><span class="lineno"> 978</span>  : __sp_is_constructible_arrN<_Up, _Nm, _Yp>::type</div><div class="line"><a name="l00979"></a><span class="lineno"> 979</span>  { };</div><div class="line"><a name="l00980"></a><span class="lineno"> 980</span> </div><div class="line"><a name="l00981"></a><span class="lineno"> 981</span>  <span class="comment">// when T is U[], Y(*)[] shall be convertible to T*;</span></div><div class="line"><a name="l00982"></a><span class="lineno"> 982</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up, <span class="keyword">typename</span> _Yp></div><div class="line"><a name="l00983"></a><span class="lineno"> 983</span>  <span class="keyword">struct </span>__sp_is_constructible<_Up[], _Yp></div><div class="line"><a name="l00984"></a><span class="lineno"> 984</span>  : __sp_is_constructible_arr<_Up, _Yp>::type</div><div class="line"><a name="l00985"></a><span class="lineno"> 985</span>  { };</div><div class="line"><a name="l00986"></a><span class="lineno"> 986</span> </div><div class="line"><a name="l00987"></a><span class="lineno"> 987</span>  <span class="comment">// otherwise, Y* shall be convertible to T*.</span></div><div class="line"><a name="l00988"></a><span class="lineno"> 988</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Yp></div><div class="line"><a name="l00989"></a><span class="lineno"> 989</span>  <span class="keyword">struct </span>__sp_is_constructible</div><div class="line"><a name="l00990"></a><span class="lineno"> 990</span>  : is_convertible<_Yp*, _Tp*>::type</div><div class="line"><a name="l00991"></a><span class="lineno"> 991</span>  { };</div><div class="line"><a name="l00992"></a><span class="lineno"> 992</span> </div><div class="line"><a name="l00993"></a><span class="lineno"> 993</span> </div><div class="line"><a name="l00994"></a><span class="lineno"> 994</span>  <span class="comment">// Define operator* and operator-> for shared_ptr<T>.</span></div><div class="line"><a name="l00995"></a><span class="lineno"> 995</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp,</div><div class="line"><a name="l00996"></a><span class="lineno"> 996</span>  <span class="keywordtype">bool</span> = is_array<_Tp>::value, <span class="keywordtype">bool</span> = is_void<_Tp>::value></div><div class="line"><a name="l00997"></a><span class="lineno"> 997</span>  <span class="keyword">class </span>__shared_ptr_access</div><div class="line"><a name="l00998"></a><span class="lineno"> 998</span>  {</div><div class="line"><a name="l00999"></a><span class="lineno"> 999</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l01000"></a><span class="lineno"> 1000</span>  <span class="keyword">using</span> element_type = _Tp;</div><div class="line"><a name="l01001"></a><span class="lineno"> 1001</span> </div><div class="line"><a name="l01002"></a><span class="lineno"> 1002</span>  element_type&</div><div class="line"><a name="l01003"></a><span class="lineno"> 1003</span>  <a class="code" href="a01467.html#gaf84b7343bdda8ed9615cd8f5a61c5e83">operator*</a>() const noexcept</div><div class="line"><a name="l01004"></a><span class="lineno"> 1004</span>  {</div><div class="line"><a name="l01005"></a><span class="lineno"> 1005</span>  __glibcxx_assert(_M_get() != <span class="keyword">nullptr</span>);</div><div class="line"><a name="l01006"></a><span class="lineno"> 1006</span>  <span class="keywordflow">return</span> *_M_get();</div><div class="line"><a name="l01007"></a><span class="lineno"> 1007</span>  }</div><div class="line"><a name="l01008"></a><span class="lineno"> 1008</span> </div><div class="line"><a name="l01009"></a><span class="lineno"> 1009</span>  element_type*</div><div class="line"><a name="l01010"></a><span class="lineno"> 1010</span>  operator->() const noexcept</div><div class="line"><a name="l01011"></a><span class="lineno"> 1011</span>  {</div><div class="line"><a name="l01012"></a><span class="lineno"> 1012</span>  _GLIBCXX_DEBUG_PEDASSERT(_M_get() != <span class="keyword">nullptr</span>);</div><div class="line"><a name="l01013"></a><span class="lineno"> 1013</span>  <span class="keywordflow">return</span> _M_get();</div><div class="line"><a name="l01014"></a><span class="lineno"> 1014</span>  }</div><div class="line"><a name="l01015"></a><span class="lineno"> 1015</span> </div><div class="line"><a name="l01016"></a><span class="lineno"> 1016</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l01017"></a><span class="lineno"> 1017</span>  element_type*</div><div class="line"><a name="l01018"></a><span class="lineno"> 1018</span>  _M_get() const noexcept</div><div class="line"><a name="l01019"></a><span class="lineno"> 1019</span>  { <span class="keywordflow">return</span> <span class="keyword">static_cast<</span><span class="keyword">const </span>__shared_ptr<_Tp, _Lp>*<span class="keyword">></span>(<span class="keyword">this</span>)->get(); }</div><div class="line"><a name="l01020"></a><span class="lineno"> 1020</span>  };</div><div class="line"><a name="l01021"></a><span class="lineno"> 1021</span> </div><div class="line"><a name="l01022"></a><span class="lineno"> 1022</span>  <span class="comment">// Define operator-> for shared_ptr<cv void>.</span></div><div class="line"><a name="l01023"></a><span class="lineno"> 1023</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01024"></a><span class="lineno"> 1024</span>  <span class="keyword">class </span>__shared_ptr_access<_Tp, _Lp, false, true></div><div class="line"><a name="l01025"></a><span class="lineno"> 1025</span>  {</div><div class="line"><a name="l01026"></a><span class="lineno"> 1026</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l01027"></a><span class="lineno"> 1027</span>  <span class="keyword">using</span> element_type = _Tp;</div><div class="line"><a name="l01028"></a><span class="lineno"> 1028</span> </div><div class="line"><a name="l01029"></a><span class="lineno"> 1029</span>  element_type*</div><div class="line"><a name="l01030"></a><span class="lineno"> 1030</span>  operator->() const noexcept</div><div class="line"><a name="l01031"></a><span class="lineno"> 1031</span>  {</div><div class="line"><a name="l01032"></a><span class="lineno"> 1032</span>  <span class="keyword">auto</span> __ptr = <span class="keyword">static_cast<</span><span class="keyword">const </span>__shared_ptr<_Tp, _Lp>*<span class="keyword">></span>(<span class="keyword">this</span>)->get();</div><div class="line"><a name="l01033"></a><span class="lineno"> 1033</span>  _GLIBCXX_DEBUG_PEDASSERT(__ptr != <span class="keyword">nullptr</span>);</div><div class="line"><a name="l01034"></a><span class="lineno"> 1034</span>  <span class="keywordflow">return</span> __ptr;</div><div class="line"><a name="l01035"></a><span class="lineno"> 1035</span>  }</div><div class="line"><a name="l01036"></a><span class="lineno"> 1036</span>  };</div><div class="line"><a name="l01037"></a><span class="lineno"> 1037</span> </div><div class="line"><a name="l01038"></a><span class="lineno"> 1038</span>  <span class="comment">// Define operator[] for shared_ptr<T[]> and shared_ptr<T[N]>.</span></div><div class="line"><a name="l01039"></a><span class="lineno"> 1039</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01040"></a><span class="lineno"> 1040</span>  <span class="keyword">class </span>__shared_ptr_access<_Tp, _Lp, true, false></div><div class="line"><a name="l01041"></a><span class="lineno"> 1041</span>  {</div><div class="line"><a name="l01042"></a><span class="lineno"> 1042</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l01043"></a><span class="lineno"> 1043</span>  <span class="keyword">using</span> element_type = <span class="keyword">typename</span> remove_extent<_Tp>::type;</div><div class="line"><a name="l01044"></a><span class="lineno"> 1044</span> </div><div class="line"><a name="l01045"></a><span class="lineno"> 1045</span> <span class="preprocessor">#if __cplusplus <= 201402L</span></div><div class="line"><a name="l01046"></a><span class="lineno"> 1046</span>  [[__deprecated__(<span class="stringliteral">"shared_ptr<T[]>::operator* is absent from C++17"</span>)]]</div><div class="line"><a name="l01047"></a><span class="lineno"> 1047</span>  element_type&</div><div class="line"><a name="l01048"></a><span class="lineno"> 1048</span>  <a class="code" href="a01467.html#gaf84b7343bdda8ed9615cd8f5a61c5e83">operator*</a>() const noexcept</div><div class="line"><a name="l01049"></a><span class="lineno"> 1049</span>  {</div><div class="line"><a name="l01050"></a><span class="lineno"> 1050</span>  __glibcxx_assert(_M_get() != <span class="keyword">nullptr</span>);</div><div class="line"><a name="l01051"></a><span class="lineno"> 1051</span>  <span class="keywordflow">return</span> *_M_get();</div><div class="line"><a name="l01052"></a><span class="lineno"> 1052</span>  }</div><div class="line"><a name="l01053"></a><span class="lineno"> 1053</span> </div><div class="line"><a name="l01054"></a><span class="lineno"> 1054</span>  [[__deprecated__(<span class="stringliteral">"shared_ptr<T[]>::operator-> is absent from C++17"</span>)]]</div><div class="line"><a name="l01055"></a><span class="lineno"> 1055</span>  element_type*</div><div class="line"><a name="l01056"></a><span class="lineno"> 1056</span>  operator->() const noexcept</div><div class="line"><a name="l01057"></a><span class="lineno"> 1057</span>  {</div><div class="line"><a name="l01058"></a><span class="lineno"> 1058</span>  _GLIBCXX_DEBUG_PEDASSERT(_M_get() != <span class="keyword">nullptr</span>);</div><div class="line"><a name="l01059"></a><span class="lineno"> 1059</span>  <span class="keywordflow">return</span> _M_get();</div><div class="line"><a name="l01060"></a><span class="lineno"> 1060</span>  }</div><div class="line"><a name="l01061"></a><span class="lineno"> 1061</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l01062"></a><span class="lineno"> 1062</span> </div><div class="line"><a name="l01063"></a><span class="lineno"> 1063</span>  element_type&</div><div class="line"><a name="l01064"></a><span class="lineno"> 1064</span>  operator[](ptrdiff_t __i)<span class="keyword"> const</span></div><div class="line"><a name="l01065"></a><span class="lineno"> 1065</span> <span class="keyword"> </span>{</div><div class="line"><a name="l01066"></a><span class="lineno"> 1066</span>  __glibcxx_assert(_M_get() != <span class="keyword">nullptr</span>);</div><div class="line"><a name="l01067"></a><span class="lineno"> 1067</span>  __glibcxx_assert(!extent<_Tp>::value || __i < extent<_Tp>::value);</div><div class="line"><a name="l01068"></a><span class="lineno"> 1068</span>  <span class="keywordflow">return</span> _M_get()[__i];</div><div class="line"><a name="l01069"></a><span class="lineno"> 1069</span>  }</div><div class="line"><a name="l01070"></a><span class="lineno"> 1070</span> </div><div class="line"><a name="l01071"></a><span class="lineno"> 1071</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l01072"></a><span class="lineno"> 1072</span>  element_type*</div><div class="line"><a name="l01073"></a><span class="lineno"> 1073</span>  _M_get() const noexcept</div><div class="line"><a name="l01074"></a><span class="lineno"> 1074</span>  { <span class="keywordflow">return</span> <span class="keyword">static_cast<</span><span class="keyword">const </span>__shared_ptr<_Tp, _Lp>*<span class="keyword">></span>(<span class="keyword">this</span>)->get(); }</div><div class="line"><a name="l01075"></a><span class="lineno"> 1075</span>  };</div><div class="line"><a name="l01076"></a><span class="lineno"> 1076</span> </div><div class="line"><a name="l01077"></a><span class="lineno"> 1077</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01078"></a><span class="lineno"> 1078</span>  <span class="keyword">class </span>__shared_ptr</div><div class="line"><a name="l01079"></a><span class="lineno"> 1079</span>  : <span class="keyword">public</span> __shared_ptr_access<_Tp, _Lp></div><div class="line"><a name="l01080"></a><span class="lineno"> 1080</span>  {</div><div class="line"><a name="l01081"></a><span class="lineno"> 1081</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l01082"></a><span class="lineno"> 1082</span>  <span class="keyword">using</span> element_type = <span class="keyword">typename</span> remove_extent<_Tp>::type;</div><div class="line"><a name="l01083"></a><span class="lineno"> 1083</span> </div><div class="line"><a name="l01084"></a><span class="lineno"> 1084</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l01085"></a><span class="lineno"> 1085</span>  <span class="comment">// Constraint for taking ownership of a pointer of type _Yp*:</span></div><div class="line"><a name="l01086"></a><span class="lineno"> 1086</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l01087"></a><span class="lineno"> 1087</span>  <span class="keyword">using</span> _SafeConv</div><div class="line"><a name="l01088"></a><span class="lineno"> 1088</span>  = <span class="keyword">typename</span> enable_if<__sp_is_constructible<_Tp, _Yp>::value>::type;</div><div class="line"><a name="l01089"></a><span class="lineno"> 1089</span> </div><div class="line"><a name="l01090"></a><span class="lineno"> 1090</span>  <span class="comment">// Constraint for construction from shared_ptr and weak_ptr:</span></div><div class="line"><a name="l01091"></a><span class="lineno"> 1091</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Res = <span class="keywordtype">void</span>></div><div class="line"><a name="l01092"></a><span class="lineno"> 1092</span>  <span class="keyword">using</span> _Compatible = <span class="keyword">typename</span></div><div class="line"><a name="l01093"></a><span class="lineno"> 1093</span>  enable_if<__sp_compatible_with<_Yp*, _Tp*>::value, _Res>::type;</div><div class="line"><a name="l01094"></a><span class="lineno"> 1094</span> </div><div class="line"><a name="l01095"></a><span class="lineno"> 1095</span>  <span class="comment">// Constraint for assignment from shared_ptr and weak_ptr:</span></div><div class="line"><a name="l01096"></a><span class="lineno"> 1096</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l01097"></a><span class="lineno"> 1097</span>  <span class="keyword">using</span> _Assignable = _Compatible<_Yp, __shared_ptr&>;</div><div class="line"><a name="l01098"></a><span class="lineno"> 1098</span> </div><div class="line"><a name="l01099"></a><span class="lineno"> 1099</span>  <span class="comment">// Constraint for construction from unique_ptr:</span></div><div class="line"><a name="l01100"></a><span class="lineno"> 1100</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Del, <span class="keyword">typename</span> _Res = void,</div><div class="line"><a name="l01101"></a><span class="lineno"> 1101</span>  <span class="keyword">typename</span> _Ptr = <span class="keyword">typename</span> unique_ptr<_Yp, _Del>::pointer></div><div class="line"><a name="l01102"></a><span class="lineno"> 1102</span>  <span class="keyword">using</span> _UniqCompatible = <span class="keyword">typename</span> enable_if<__and_<</div><div class="line"><a name="l01103"></a><span class="lineno"> 1103</span>  __sp_compatible_with<_Yp*, _Tp*>, is_convertible<_Ptr, element_type*></div><div class="line"><a name="l01104"></a><span class="lineno"> 1104</span>  >::value, _Res>::type;</div><div class="line"><a name="l01105"></a><span class="lineno"> 1105</span> </div><div class="line"><a name="l01106"></a><span class="lineno"> 1106</span>  <span class="comment">// Constraint for assignment from unique_ptr:</span></div><div class="line"><a name="l01107"></a><span class="lineno"> 1107</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Del></div><div class="line"><a name="l01108"></a><span class="lineno"> 1108</span>  <span class="keyword">using</span> _UniqAssignable = _UniqCompatible<_Yp, _Del, __shared_ptr&>;</div><div class="line"><a name="l01109"></a><span class="lineno"> 1109</span> </div><div class="line"><a name="l01110"></a><span class="lineno"> 1110</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l01111"></a><span class="lineno"> 1111</span> </div><div class="line"><a name="l01112"></a><span class="lineno"> 1112</span> <span class="preprocessor">#if __cplusplus > 201402L</span></div><div class="line"><a name="l01113"></a><span class="lineno"> 1113</span>  <span class="keyword">using</span> weak_type = __weak_ptr<_Tp, _Lp>;</div><div class="line"><a name="l01114"></a><span class="lineno"> 1114</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l01115"></a><span class="lineno"> 1115</span> </div><div class="line"><a name="l01116"></a><span class="lineno"> 1116</span>  constexpr __shared_ptr() noexcept</div><div class="line"><a name="l01117"></a><span class="lineno"> 1117</span>  : _M_ptr(0), _M_refcount()</div><div class="line"><a name="l01118"></a><span class="lineno"> 1118</span>  { }</div><div class="line"><a name="l01119"></a><span class="lineno"> 1119</span> </div><div class="line"><a name="l01120"></a><span class="lineno"> 1120</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _SafeConv<_Yp>></div><div class="line"><a name="l01121"></a><span class="lineno"> 1121</span>  <span class="keyword">explicit</span></div><div class="line"><a name="l01122"></a><span class="lineno"> 1122</span>  __shared_ptr(_Yp* __p)</div><div class="line"><a name="l01123"></a><span class="lineno"> 1123</span>  : _M_ptr(__p), _M_refcount(__p, typename is_array<_Tp>::type())</div><div class="line"><a name="l01124"></a><span class="lineno"> 1124</span>  {</div><div class="line"><a name="l01125"></a><span class="lineno"> 1125</span>  static_assert( !is_void<_Yp>::value, <span class="stringliteral">"incomplete type"</span> );</div><div class="line"><a name="l01126"></a><span class="lineno"> 1126</span>  static_assert( <span class="keyword">sizeof</span>(_Yp) > 0, <span class="stringliteral">"incomplete type"</span> );</div><div class="line"><a name="l01127"></a><span class="lineno"> 1127</span>  _M_enable_shared_from_this_with(__p);</div><div class="line"><a name="l01128"></a><span class="lineno"> 1128</span>  }</div><div class="line"><a name="l01129"></a><span class="lineno"> 1129</span> </div><div class="line"><a name="l01130"></a><span class="lineno"> 1130</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Deleter, <span class="keyword">typename</span> = _SafeConv<_Yp>></div><div class="line"><a name="l01131"></a><span class="lineno"> 1131</span>  __shared_ptr(_Yp* __p, _Deleter __d)</div><div class="line"><a name="l01132"></a><span class="lineno"> 1132</span>  : _M_ptr(__p), _M_refcount(__p, <a class="code" href="a01538.html">std</a>::move(__d))</div><div class="line"><a name="l01133"></a><span class="lineno"> 1133</span>  {</div><div class="line"><a name="l01134"></a><span class="lineno"> 1134</span>  static_assert(__is_invocable<_Deleter&, _Yp*&>::value,</div><div class="line"><a name="l01135"></a><span class="lineno"> 1135</span>  <span class="stringliteral">"deleter expression d(p) is well-formed"</span>);</div><div class="line"><a name="l01136"></a><span class="lineno"> 1136</span>  _M_enable_shared_from_this_with(__p);</div><div class="line"><a name="l01137"></a><span class="lineno"> 1137</span>  }</div><div class="line"><a name="l01138"></a><span class="lineno"> 1138</span> </div><div class="line"><a name="l01139"></a><span class="lineno"> 1139</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Deleter, <span class="keyword">typename</span> _Alloc,</div><div class="line"><a name="l01140"></a><span class="lineno"> 1140</span>  <span class="keyword">typename</span> = _SafeConv<_Yp>></div><div class="line"><a name="l01141"></a><span class="lineno"> 1141</span>  __shared_ptr(_Yp* __p, _Deleter __d, _Alloc __a)</div><div class="line"><a name="l01142"></a><span class="lineno"> 1142</span>  : _M_ptr(__p), _M_refcount(__p, <a class="code" href="a01538.html">std</a>::move(__d), <a class="code" href="a01538.html">std</a>::move(__a))</div><div class="line"><a name="l01143"></a><span class="lineno"> 1143</span>  {</div><div class="line"><a name="l01144"></a><span class="lineno"> 1144</span>  static_assert(__is_invocable<_Deleter&, _Yp*&>::value,</div><div class="line"><a name="l01145"></a><span class="lineno"> 1145</span>  <span class="stringliteral">"deleter expression d(p) is well-formed"</span>);</div><div class="line"><a name="l01146"></a><span class="lineno"> 1146</span>  _M_enable_shared_from_this_with(__p);</div><div class="line"><a name="l01147"></a><span class="lineno"> 1147</span>  }</div><div class="line"><a name="l01148"></a><span class="lineno"> 1148</span> </div><div class="line"><a name="l01149"></a><span class="lineno"> 1149</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Deleter></div><div class="line"><a name="l01150"></a><span class="lineno"> 1150</span>  __shared_ptr(nullptr_t __p, _Deleter __d)</div><div class="line"><a name="l01151"></a><span class="lineno"> 1151</span>  : _M_ptr(0), _M_refcount(__p, <a class="code" href="a01538.html">std</a>::move(__d))</div><div class="line"><a name="l01152"></a><span class="lineno"> 1152</span>  { }</div><div class="line"><a name="l01153"></a><span class="lineno"> 1153</span> </div><div class="line"><a name="l01154"></a><span class="lineno"> 1154</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Deleter, <span class="keyword">typename</span> _Alloc></div><div class="line"><a name="l01155"></a><span class="lineno"> 1155</span>  __shared_ptr(nullptr_t __p, _Deleter __d, _Alloc __a)</div><div class="line"><a name="l01156"></a><span class="lineno"> 1156</span>  : _M_ptr(0), _M_refcount(__p, <a class="code" href="a01538.html">std</a>::move(__d), <a class="code" href="a01538.html">std</a>::move(__a))</div><div class="line"><a name="l01157"></a><span class="lineno"> 1157</span>  { }</div><div class="line"><a name="l01158"></a><span class="lineno"> 1158</span> </div><div class="line"><a name="l01159"></a><span class="lineno"> 1159</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l01160"></a><span class="lineno"> 1160</span>  __shared_ptr(<span class="keyword">const</span> __shared_ptr<_Yp, _Lp>& __r,</div><div class="line"><a name="l01161"></a><span class="lineno"> 1161</span>  element_type* __p) noexcept</div><div class="line"><a name="l01162"></a><span class="lineno"> 1162</span>  : _M_ptr(__p), _M_refcount(__r._M_refcount) <span class="comment">// never throws</span></div><div class="line"><a name="l01163"></a><span class="lineno"> 1163</span>  { }</div><div class="line"><a name="l01164"></a><span class="lineno"> 1164</span> </div><div class="line"><a name="l01165"></a><span class="lineno"> 1165</span>  __shared_ptr(<span class="keyword">const</span> __shared_ptr&) noexcept = <span class="keywordflow">default</span>;</div><div class="line"><a name="l01166"></a><span class="lineno"> 1166</span>  __shared_ptr& operator=(<span class="keyword">const</span> __shared_ptr&) noexcept = <span class="keywordflow">default</span>;</div><div class="line"><a name="l01167"></a><span class="lineno"> 1167</span>  ~__shared_ptr() = <span class="keywordflow">default</span>;</div><div class="line"><a name="l01168"></a><span class="lineno"> 1168</span> </div><div class="line"><a name="l01169"></a><span class="lineno"> 1169</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _Compatible<_Yp>></div><div class="line"><a name="l01170"></a><span class="lineno"> 1170</span>  __shared_ptr(<span class="keyword">const</span> __shared_ptr<_Yp, _Lp>& __r) noexcept</div><div class="line"><a name="l01171"></a><span class="lineno"> 1171</span>  : _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount)</div><div class="line"><a name="l01172"></a><span class="lineno"> 1172</span>  { }</div><div class="line"><a name="l01173"></a><span class="lineno"> 1173</span> </div><div class="line"><a name="l01174"></a><span class="lineno"> 1174</span>  __shared_ptr(__shared_ptr&& __r) noexcept</div><div class="line"><a name="l01175"></a><span class="lineno"> 1175</span>  : _M_ptr(__r._M_ptr), _M_refcount()</div><div class="line"><a name="l01176"></a><span class="lineno"> 1176</span>  {</div><div class="line"><a name="l01177"></a><span class="lineno"> 1177</span>  _M_refcount._M_swap(__r._M_refcount);</div><div class="line"><a name="l01178"></a><span class="lineno"> 1178</span>  __r._M_ptr = 0;</div><div class="line"><a name="l01179"></a><span class="lineno"> 1179</span>  }</div><div class="line"><a name="l01180"></a><span class="lineno"> 1180</span> </div><div class="line"><a name="l01181"></a><span class="lineno"> 1181</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _Compatible<_Yp>></div><div class="line"><a name="l01182"></a><span class="lineno"> 1182</span>  __shared_ptr(__shared_ptr<_Yp, _Lp>&& __r) noexcept</div><div class="line"><a name="l01183"></a><span class="lineno"> 1183</span>  : _M_ptr(__r._M_ptr), _M_refcount()</div><div class="line"><a name="l01184"></a><span class="lineno"> 1184</span>  {</div><div class="line"><a name="l01185"></a><span class="lineno"> 1185</span>  _M_refcount._M_swap(__r._M_refcount);</div><div class="line"><a name="l01186"></a><span class="lineno"> 1186</span>  __r._M_ptr = 0;</div><div class="line"><a name="l01187"></a><span class="lineno"> 1187</span>  }</div><div class="line"><a name="l01188"></a><span class="lineno"> 1188</span> </div><div class="line"><a name="l01189"></a><span class="lineno"> 1189</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _Compatible<_Yp>></div><div class="line"><a name="l01190"></a><span class="lineno"> 1190</span>  <span class="keyword">explicit</span> __shared_ptr(<span class="keyword">const</span> __weak_ptr<_Yp, _Lp>& __r)</div><div class="line"><a name="l01191"></a><span class="lineno"> 1191</span>  : _M_refcount(__r._M_refcount) <span class="comment">// may throw</span></div><div class="line"><a name="l01192"></a><span class="lineno"> 1192</span>  {</div><div class="line"><a name="l01193"></a><span class="lineno"> 1193</span>  <span class="comment">// It is now safe to copy __r._M_ptr, as</span></div><div class="line"><a name="l01194"></a><span class="lineno"> 1194</span>  <span class="comment">// _M_refcount(__r._M_refcount) did not throw.</span></div><div class="line"><a name="l01195"></a><span class="lineno"> 1195</span>  _M_ptr = __r._M_ptr;</div><div class="line"><a name="l01196"></a><span class="lineno"> 1196</span>  }</div><div class="line"><a name="l01197"></a><span class="lineno"> 1197</span> </div><div class="line"><a name="l01198"></a><span class="lineno"> 1198</span>  <span class="comment">// If an exception is thrown this constructor has no effect.</span></div><div class="line"><a name="l01199"></a><span class="lineno"> 1199</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Del,</div><div class="line"><a name="l01200"></a><span class="lineno"> 1200</span>  <span class="keyword">typename</span> = _UniqCompatible<_Yp, _Del>></div><div class="line"><a name="l01201"></a><span class="lineno"> 1201</span>  __shared_ptr(unique_ptr<_Yp, _Del>&& __r)</div><div class="line"><a name="l01202"></a><span class="lineno"> 1202</span>  : _M_ptr(__r.get()), _M_refcount()</div><div class="line"><a name="l01203"></a><span class="lineno"> 1203</span>  {</div><div class="line"><a name="l01204"></a><span class="lineno"> 1204</span>  <span class="keyword">auto</span> __raw = __to_address(__r.get());</div><div class="line"><a name="l01205"></a><span class="lineno"> 1205</span>  _M_refcount = __shared_count<_Lp>(std::move(__r));</div><div class="line"><a name="l01206"></a><span class="lineno"> 1206</span>  _M_enable_shared_from_this_with(__raw);</div><div class="line"><a name="l01207"></a><span class="lineno"> 1207</span>  }</div><div class="line"><a name="l01208"></a><span class="lineno"> 1208</span> </div><div class="line"><a name="l01209"></a><span class="lineno"> 1209</span> <span class="preprocessor">#if __cplusplus <= 201402L && _GLIBCXX_USE_DEPRECATED</span></div><div class="line"><a name="l01210"></a><span class="lineno"> 1210</span>  <span class="keyword">protected</span>:</div><div class="line"><a name="l01211"></a><span class="lineno"> 1211</span>  <span class="comment">// If an exception is thrown this constructor has no effect.</span></div><div class="line"><a name="l01212"></a><span class="lineno"> 1212</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1, <span class="keyword">typename</span> _Del,</div><div class="line"><a name="l01213"></a><span class="lineno"> 1213</span>  <span class="keyword">typename</span> enable_if<__and_<</div><div class="line"><a name="l01214"></a><span class="lineno"> 1214</span>  __not_<is_array<_Tp>>, is_array<_Tp1>,</div><div class="line"><a name="l01215"></a><span class="lineno"> 1215</span>  is_convertible<typename unique_ptr<_Tp1, _Del>::pointer, _Tp*></div><div class="line"><a name="l01216"></a><span class="lineno"> 1216</span>  >::value, <span class="keywordtype">bool</span>>::type = <span class="keyword">true</span>></div><div class="line"><a name="l01217"></a><span class="lineno"> 1217</span>  __shared_ptr(unique_ptr<_Tp1, _Del>&& __r, __sp_array_delete)</div><div class="line"><a name="l01218"></a><span class="lineno"> 1218</span>  : _M_ptr(__r.get()), _M_refcount()</div><div class="line"><a name="l01219"></a><span class="lineno"> 1219</span>  {</div><div class="line"><a name="l01220"></a><span class="lineno"> 1220</span>  <span class="keyword">auto</span> __raw = __to_address(__r.get());</div><div class="line"><a name="l01221"></a><span class="lineno"> 1221</span>  _M_refcount = __shared_count<_Lp>(std::move(__r));</div><div class="line"><a name="l01222"></a><span class="lineno"> 1222</span>  _M_enable_shared_from_this_with(__raw);</div><div class="line"><a name="l01223"></a><span class="lineno"> 1223</span>  }</div><div class="line"><a name="l01224"></a><span class="lineno"> 1224</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l01225"></a><span class="lineno"> 1225</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l01226"></a><span class="lineno"> 1226</span> </div><div class="line"><a name="l01227"></a><span class="lineno"> 1227</span> <span class="preprocessor">#if _GLIBCXX_USE_DEPRECATED</span></div><div class="line"><a name="l01228"></a><span class="lineno"> 1228</span> <span class="preprocessor">#pragma GCC diagnostic push</span></div><div class="line"><a name="l01229"></a><span class="lineno"> 1229</span> <span class="preprocessor">#pragma GCC diagnostic ignored "-Wdeprecated-declarations"</span></div><div class="line"><a name="l01230"></a><span class="lineno"> 1230</span>  <span class="comment">// Postcondition: use_count() == 1 and __r.get() == 0</span></div><div class="line"><a name="l01231"></a><span class="lineno"> 1231</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _Compatible<_Yp>></div><div class="line"><a name="l01232"></a><span class="lineno"> 1232</span>  __shared_ptr(auto_ptr<_Yp>&& __r);</div><div class="line"><a name="l01233"></a><span class="lineno"> 1233</span> <span class="preprocessor">#pragma GCC diagnostic pop</span></div><div class="line"><a name="l01234"></a><span class="lineno"> 1234</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l01235"></a><span class="lineno"> 1235</span> </div><div class="line"><a name="l01236"></a><span class="lineno"> 1236</span>  constexpr __shared_ptr(nullptr_t) noexcept : __shared_ptr() { }</div><div class="line"><a name="l01237"></a><span class="lineno"> 1237</span> </div><div class="line"><a name="l01238"></a><span class="lineno"> 1238</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l01239"></a><span class="lineno"> 1239</span>  _Assignable<_Yp></div><div class="line"><a name="l01240"></a><span class="lineno"> 1240</span>  operator=(<span class="keyword">const</span> __shared_ptr<_Yp, _Lp>& __r) noexcept</div><div class="line"><a name="l01241"></a><span class="lineno"> 1241</span>  {</div><div class="line"><a name="l01242"></a><span class="lineno"> 1242</span>  _M_ptr = __r._M_ptr;</div><div class="line"><a name="l01243"></a><span class="lineno"> 1243</span>  _M_refcount = __r._M_refcount; <span class="comment">// __shared_count::op= doesn't throw</span></div><div class="line"><a name="l01244"></a><span class="lineno"> 1244</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l01245"></a><span class="lineno"> 1245</span>  }</div><div class="line"><a name="l01246"></a><span class="lineno"> 1246</span> </div><div class="line"><a name="l01247"></a><span class="lineno"> 1247</span> <span class="preprocessor">#if _GLIBCXX_USE_DEPRECATED</span></div><div class="line"><a name="l01248"></a><span class="lineno"> 1248</span> <span class="preprocessor">#pragma GCC diagnostic push</span></div><div class="line"><a name="l01249"></a><span class="lineno"> 1249</span> <span class="preprocessor">#pragma GCC diagnostic ignored "-Wdeprecated-declarations"</span></div><div class="line"><a name="l01250"></a><span class="lineno"> 1250</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l01251"></a><span class="lineno"> 1251</span>  _Assignable<_Yp></div><div class="line"><a name="l01252"></a><span class="lineno"> 1252</span>  operator=(auto_ptr<_Yp>&& __r)</div><div class="line"><a name="l01253"></a><span class="lineno"> 1253</span>  {</div><div class="line"><a name="l01254"></a><span class="lineno"> 1254</span>  __shared_ptr(std::move(__r)).swap(*<span class="keyword">this</span>);</div><div class="line"><a name="l01255"></a><span class="lineno"> 1255</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l01256"></a><span class="lineno"> 1256</span>  }</div><div class="line"><a name="l01257"></a><span class="lineno"> 1257</span> <span class="preprocessor">#pragma GCC diagnostic pop</span></div><div class="line"><a name="l01258"></a><span class="lineno"> 1258</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l01259"></a><span class="lineno"> 1259</span> </div><div class="line"><a name="l01260"></a><span class="lineno"> 1260</span>  __shared_ptr&</div><div class="line"><a name="l01261"></a><span class="lineno"> 1261</span>  operator=(__shared_ptr&& __r) noexcept</div><div class="line"><a name="l01262"></a><span class="lineno"> 1262</span>  {</div><div class="line"><a name="l01263"></a><span class="lineno"> 1263</span>  __shared_ptr(std::move(__r)).swap(*<span class="keyword">this</span>);</div><div class="line"><a name="l01264"></a><span class="lineno"> 1264</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l01265"></a><span class="lineno"> 1265</span>  }</div><div class="line"><a name="l01266"></a><span class="lineno"> 1266</span> </div><div class="line"><a name="l01267"></a><span class="lineno"> 1267</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Yp></div><div class="line"><a name="l01268"></a><span class="lineno"> 1268</span>  _Assignable<_Yp></div><div class="line"><a name="l01269"></a><span class="lineno"> 1269</span>  operator=(__shared_ptr<_Yp, _Lp>&& __r) noexcept</div><div class="line"><a name="l01270"></a><span class="lineno"> 1270</span>  {</div><div class="line"><a name="l01271"></a><span class="lineno"> 1271</span>  __shared_ptr(std::move(__r)).swap(*<span class="keyword">this</span>);</div><div class="line"><a name="l01272"></a><span class="lineno"> 1272</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l01273"></a><span class="lineno"> 1273</span>  }</div><div class="line"><a name="l01274"></a><span class="lineno"> 1274</span> </div><div class="line"><a name="l01275"></a><span class="lineno"> 1275</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Del></div><div class="line"><a name="l01276"></a><span class="lineno"> 1276</span>  _UniqAssignable<_Yp, _Del></div><div class="line"><a name="l01277"></a><span class="lineno"> 1277</span>  operator=(unique_ptr<_Yp, _Del>&& __r)</div><div class="line"><a name="l01278"></a><span class="lineno"> 1278</span>  {</div><div class="line"><a name="l01279"></a><span class="lineno"> 1279</span>  __shared_ptr(std::move(__r)).swap(*<span class="keyword">this</span>);</div><div class="line"><a name="l01280"></a><span class="lineno"> 1280</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l01281"></a><span class="lineno"> 1281</span>  }</div><div class="line"><a name="l01282"></a><span class="lineno"> 1282</span> </div><div class="line"><a name="l01283"></a><span class="lineno"> 1283</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l01284"></a><span class="lineno"> 1284</span>  reset() noexcept</div><div class="line"><a name="l01285"></a><span class="lineno"> 1285</span>  { __shared_ptr().swap(*<span class="keyword">this</span>); }</div><div class="line"><a name="l01286"></a><span class="lineno"> 1286</span> </div><div class="line"><a name="l01287"></a><span class="lineno"> 1287</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l01288"></a><span class="lineno"> 1288</span>  _SafeConv<_Yp></div><div class="line"><a name="l01289"></a><span class="lineno"> 1289</span>  reset(_Yp* __p) <span class="comment">// _Yp must be complete.</span></div><div class="line"><a name="l01290"></a><span class="lineno"> 1290</span>  {</div><div class="line"><a name="l01291"></a><span class="lineno"> 1291</span>  <span class="comment">// Catch self-reset errors.</span></div><div class="line"><a name="l01292"></a><span class="lineno"> 1292</span>  __glibcxx_assert(__p == 0 || __p != _M_ptr);</div><div class="line"><a name="l01293"></a><span class="lineno"> 1293</span>  __shared_ptr(__p).swap(*<span class="keyword">this</span>);</div><div class="line"><a name="l01294"></a><span class="lineno"> 1294</span>  }</div><div class="line"><a name="l01295"></a><span class="lineno"> 1295</span> </div><div class="line"><a name="l01296"></a><span class="lineno"> 1296</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Deleter></div><div class="line"><a name="l01297"></a><span class="lineno"> 1297</span>  _SafeConv<_Yp></div><div class="line"><a name="l01298"></a><span class="lineno"> 1298</span>  reset(_Yp* __p, _Deleter __d)</div><div class="line"><a name="l01299"></a><span class="lineno"> 1299</span>  { __shared_ptr(__p, std::move(__d)).swap(*<span class="keyword">this</span>); }</div><div class="line"><a name="l01300"></a><span class="lineno"> 1300</span> </div><div class="line"><a name="l01301"></a><span class="lineno"> 1301</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Deleter, <span class="keyword">typename</span> _Alloc></div><div class="line"><a name="l01302"></a><span class="lineno"> 1302</span>  _SafeConv<_Yp></div><div class="line"><a name="l01303"></a><span class="lineno"> 1303</span>  reset(_Yp* __p, _Deleter __d, _Alloc __a)</div><div class="line"><a name="l01304"></a><span class="lineno"> 1304</span>  { __shared_ptr(__p, std::move(__d), std::move(__a)).swap(*<span class="keyword">this</span>); }</div><div class="line"><a name="l01305"></a><span class="lineno"> 1305</span> </div><div class="line"><a name="l01306"></a><span class="lineno"> 1306</span>  element_type*</div><div class="line"><a name="l01307"></a><span class="lineno"> 1307</span>  get() const noexcept</div><div class="line"><a name="l01308"></a><span class="lineno"> 1308</span>  { <span class="keywordflow">return</span> _M_ptr; }</div><div class="line"><a name="l01309"></a><span class="lineno"> 1309</span> </div><div class="line"><a name="l01310"></a><span class="lineno"> 1310</span>  <span class="keyword">explicit</span> <span class="keyword">operator</span> bool() const <span class="comment">// never throws</span></div><div class="line"><a name="l01311"></a><span class="lineno"> 1311</span>  { <span class="keywordflow">return</span> _M_ptr == 0 ? false : <span class="keyword">true</span>; }</div><div class="line"><a name="l01312"></a><span class="lineno"> 1312</span> </div><div class="line"><a name="l01313"></a><span class="lineno"> 1313</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l01314"></a><span class="lineno"> 1314</span>  unique() const noexcept</div><div class="line"><a name="l01315"></a><span class="lineno"> 1315</span>  { <span class="keywordflow">return</span> _M_refcount._M_unique(); }</div><div class="line"><a name="l01316"></a><span class="lineno"> 1316</span> </div><div class="line"><a name="l01317"></a><span class="lineno"> 1317</span>  <span class="keywordtype">long</span></div><div class="line"><a name="l01318"></a><span class="lineno"> 1318</span>  use_count() const noexcept</div><div class="line"><a name="l01319"></a><span class="lineno"> 1319</span>  { <span class="keywordflow">return</span> _M_refcount._M_get_use_count(); }</div><div class="line"><a name="l01320"></a><span class="lineno"> 1320</span> </div><div class="line"><a name="l01321"></a><span class="lineno"> 1321</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l01322"></a><span class="lineno"> 1322</span>  swap(__shared_ptr<_Tp, _Lp>& __other) noexcept</div><div class="line"><a name="l01323"></a><span class="lineno"> 1323</span>  {</div><div class="line"><a name="l01324"></a><span class="lineno"> 1324</span>  std::swap(_M_ptr, __other._M_ptr);</div><div class="line"><a name="l01325"></a><span class="lineno"> 1325</span>  _M_refcount._M_swap(__other._M_refcount);</div><div class="line"><a name="l01326"></a><span class="lineno"> 1326</span>  }</div><div class="line"><a name="l01327"></a><span class="lineno"> 1327</span> </div><div class="line"><a name="l01328"></a><span class="lineno"> 1328</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1></div><div class="line"><a name="l01329"></a><span class="lineno"> 1329</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l01330"></a><span class="lineno"> 1330</span>  owner_before(__shared_ptr<_Tp1, _Lp> <span class="keyword">const</span>& __rhs) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l01331"></a><span class="lineno"> 1331</span>  { <span class="keywordflow">return</span> _M_refcount._M_less(__rhs._M_refcount); }</div><div class="line"><a name="l01332"></a><span class="lineno"> 1332</span> </div><div class="line"><a name="l01333"></a><span class="lineno"> 1333</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1></div><div class="line"><a name="l01334"></a><span class="lineno"> 1334</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l01335"></a><span class="lineno"> 1335</span>  owner_before(__weak_ptr<_Tp1, _Lp> <span class="keyword">const</span>& __rhs) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l01336"></a><span class="lineno"> 1336</span>  { <span class="keywordflow">return</span> _M_refcount._M_less(__rhs._M_refcount); }</div><div class="line"><a name="l01337"></a><span class="lineno"> 1337</span> </div><div class="line"><a name="l01338"></a><span class="lineno"> 1338</span>  <span class="keyword">protected</span>:</div><div class="line"><a name="l01339"></a><span class="lineno"> 1339</span>  <span class="comment">// This constructor is non-standard, it is used by allocate_shared.</span></div><div class="line"><a name="l01340"></a><span class="lineno"> 1340</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Alloc, <span class="keyword">typename</span>... _Args></div><div class="line"><a name="l01341"></a><span class="lineno"> 1341</span>  __shared_ptr(_Sp_alloc_shared_tag<_Alloc> __tag, _Args&&... __args)</div><div class="line"><a name="l01342"></a><span class="lineno"> 1342</span>  : _M_ptr(), _M_refcount(_M_ptr, __tag, <a class="code" href="a01538.html">std</a>::<a class="code" href="a01477.html#gacb5baec338e12b99cb6bddea7506c7c6">forward</a><_Args>(__args)...)</div><div class="line"><a name="l01343"></a><span class="lineno"> 1343</span>  { _M_enable_shared_from_this_with(_M_ptr); }</div><div class="line"><a name="l01344"></a><span class="lineno"> 1344</span> </div><div class="line"><a name="l01345"></a><span class="lineno"> 1345</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1, _Lock_policy _Lp1, <span class="keyword">typename</span> _Alloc,</div><div class="line"><a name="l01346"></a><span class="lineno"> 1346</span>  <span class="keyword">typename</span>... _Args></div><div class="line"><a name="l01347"></a><span class="lineno"> 1347</span>  <span class="keyword">friend</span> __shared_ptr<_Tp1, _Lp1></div><div class="line"><a name="l01348"></a><span class="lineno"> 1348</span>  __allocate_shared(<span class="keyword">const</span> _Alloc& __a, _Args&&... __args);</div><div class="line"><a name="l01349"></a><span class="lineno"> 1349</span> </div><div class="line"><a name="l01350"></a><span class="lineno"> 1350</span>  <span class="comment">// This constructor is used by __weak_ptr::lock() and</span></div><div class="line"><a name="l01351"></a><span class="lineno"> 1351</span>  <span class="comment">// shared_ptr::shared_ptr(const weak_ptr&, std::nothrow_t).</span></div><div class="line"><a name="l01352"></a><span class="lineno"> 1352</span>  __shared_ptr(<span class="keyword">const</span> __weak_ptr<_Tp, _Lp>& __r, std::nothrow_t)</div><div class="line"><a name="l01353"></a><span class="lineno"> 1353</span>  : _M_refcount(__r._M_refcount, <a class="code" href="a01538.html">std</a>::nothrow)</div><div class="line"><a name="l01354"></a><span class="lineno"> 1354</span>  {</div><div class="line"><a name="l01355"></a><span class="lineno"> 1355</span>  _M_ptr = _M_refcount._M_get_use_count() ? __r._M_ptr : <span class="keyword">nullptr</span>;</div><div class="line"><a name="l01356"></a><span class="lineno"> 1356</span>  }</div><div class="line"><a name="l01357"></a><span class="lineno"> 1357</span> </div><div class="line"><a name="l01358"></a><span class="lineno"> 1358</span>  <span class="keyword">friend</span> <span class="keyword">class </span>__weak_ptr<_Tp, _Lp>;</div><div class="line"><a name="l01359"></a><span class="lineno"> 1359</span> </div><div class="line"><a name="l01360"></a><span class="lineno"> 1360</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l01361"></a><span class="lineno"> 1361</span> </div><div class="line"><a name="l01362"></a><span class="lineno"> 1362</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l01363"></a><span class="lineno"> 1363</span>  <span class="keyword">using</span> __esft_base_t = decltype(__enable_shared_from_this_base(</div><div class="line"><a name="l01364"></a><span class="lineno"> 1364</span>  std::declval<<span class="keyword">const</span> __shared_count<_Lp>&>(),</div><div class="line"><a name="l01365"></a><span class="lineno"> 1365</span>  std::declval<_Yp*>()));</div><div class="line"><a name="l01366"></a><span class="lineno"> 1366</span> </div><div class="line"><a name="l01367"></a><span class="lineno"> 1367</span>  <span class="comment">// Detect an accessible and unambiguous enable_shared_from_this base.</span></div><div class="line"><a name="l01368"></a><span class="lineno"> 1368</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = <span class="keywordtype">void</span>></div><div class="line"><a name="l01369"></a><span class="lineno"> 1369</span>  <span class="keyword">struct </span>__has_esft_base</div><div class="line"><a name="l01370"></a><span class="lineno"> 1370</span>  : <a class="code" href="a01476.html#gaebe6729ab5488ecc76c762873d226857">false_type</a> { };</div><div class="line"><a name="l01371"></a><span class="lineno"> 1371</span> </div><div class="line"><a name="l01372"></a><span class="lineno"> 1372</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l01373"></a><span class="lineno"> 1373</span>  <span class="keyword">struct </span>__has_esft_base<_Yp, __void_t<__esft_base_t<_Yp>>></div><div class="line"><a name="l01374"></a><span class="lineno"> 1374</span>  : __not_<is_array<_Tp>> { }; <span class="comment">// No enable shared_from_this for arrays</span></div><div class="line"><a name="l01375"></a><span class="lineno"> 1375</span> </div><div class="line"><a name="l01376"></a><span class="lineno"> 1376</span>  template<typename _Yp, typename _Yp2 = typename remove_cv<_Yp>::type></div><div class="line"><a name="l01377"></a><span class="lineno"> 1377</span>  <span class="keyword">typename</span> enable_if<__has_esft_base<_Yp2>::value>::type</div><div class="line"><a name="l01378"></a><span class="lineno"> 1378</span>  _M_enable_shared_from_this_with(_Yp* __p) noexcept</div><div class="line"><a name="l01379"></a><span class="lineno"> 1379</span>  {</div><div class="line"><a name="l01380"></a><span class="lineno"> 1380</span>  <span class="keywordflow">if</span> (<span class="keyword">auto</span> __base = __enable_shared_from_this_base(_M_refcount, __p))</div><div class="line"><a name="l01381"></a><span class="lineno"> 1381</span>  __base->_M_weak_assign(const_cast<_Yp2*>(__p), _M_refcount);</div><div class="line"><a name="l01382"></a><span class="lineno"> 1382</span>  }</div><div class="line"><a name="l01383"></a><span class="lineno"> 1383</span> </div><div class="line"><a name="l01384"></a><span class="lineno"> 1384</span>  template<typename _Yp, typename _Yp2 = typename remove_cv<_Yp>::type></div><div class="line"><a name="l01385"></a><span class="lineno"> 1385</span>  <span class="keyword">typename</span> enable_if<!__has_esft_base<_Yp2>::value>::type</div><div class="line"><a name="l01386"></a><span class="lineno"> 1386</span>  _M_enable_shared_from_this_with(_Yp*) noexcept</div><div class="line"><a name="l01387"></a><span class="lineno"> 1387</span>  { }</div><div class="line"><a name="l01388"></a><span class="lineno"> 1388</span> </div><div class="line"><a name="l01389"></a><span class="lineno"> 1389</span>  <span class="keywordtype">void</span>*</div><div class="line"><a name="l01390"></a><span class="lineno"> 1390</span>  _M_get_deleter(<span class="keyword">const</span> <a class="code" href="a01668.html">std::type_info</a>& __ti) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l01391"></a><span class="lineno"> 1391</span>  { <span class="keywordflow">return</span> _M_refcount._M_get_deleter(__ti); }</div><div class="line"><a name="l01392"></a><span class="lineno"> 1392</span> </div><div class="line"><a name="l01393"></a><span class="lineno"> 1393</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1, _Lock_policy _Lp1> <span class="keyword">friend</span> <span class="keyword">class </span>__shared_ptr;</div><div class="line"><a name="l01394"></a><span class="lineno"> 1394</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1, _Lock_policy _Lp1> <span class="keyword">friend</span> <span class="keyword">class </span>__weak_ptr;</div><div class="line"><a name="l01395"></a><span class="lineno"> 1395</span> </div><div class="line"><a name="l01396"></a><span class="lineno"> 1396</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Del, <span class="keyword">typename</span> _Tp1, _Lock_policy _Lp1></div><div class="line"><a name="l01397"></a><span class="lineno"> 1397</span>  <span class="keyword">friend</span> _Del* get_deleter(<span class="keyword">const</span> __shared_ptr<_Tp1, _Lp1>&) noexcept;</div><div class="line"><a name="l01398"></a><span class="lineno"> 1398</span> </div><div class="line"><a name="l01399"></a><span class="lineno"> 1399</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Del, <span class="keyword">typename</span> _Tp1></div><div class="line"><a name="l01400"></a><span class="lineno"> 1400</span>  <span class="keyword">friend</span> _Del* get_deleter(<span class="keyword">const</span> shared_ptr<_Tp1>&) noexcept;</div><div class="line"><a name="l01401"></a><span class="lineno"> 1401</span> </div><div class="line"><a name="l01402"></a><span class="lineno"> 1402</span>  element_type* _M_ptr; <span class="comment">// Contained pointer.</span></div><div class="line"><a name="l01403"></a><span class="lineno"> 1403</span>  __shared_count<_Lp> _M_refcount; <span class="comment">// Reference counter.</span></div><div class="line"><a name="l01404"></a><span class="lineno"> 1404</span>  };</div><div class="line"><a name="l01405"></a><span class="lineno"> 1405</span> </div><div class="line"><a name="l01406"></a><span class="lineno"> 1406</span> </div><div class="line"><a name="l01407"></a><span class="lineno"> 1407</span>  <span class="comment">// 20.7.2.2.7 shared_ptr comparisons</span></div><div class="line"><a name="l01408"></a><span class="lineno"> 1408</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1, <span class="keyword">typename</span> _Tp2, _Lock_policy _Lp></div><div class="line"><a name="l01409"></a><span class="lineno"> 1409</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01410"></a><span class="lineno"> 1410</span>  operator==(<span class="keyword">const</span> __shared_ptr<_Tp1, _Lp>& __a,</div><div class="line"><a name="l01411"></a><span class="lineno"> 1411</span>  <span class="keyword">const</span> __shared_ptr<_Tp2, _Lp>& __b) noexcept</div><div class="line"><a name="l01412"></a><span class="lineno"> 1412</span>  { <span class="keywordflow">return</span> __a.get() == __b.get(); }</div><div class="line"><a name="l01413"></a><span class="lineno"> 1413</span> </div><div class="line"><a name="l01414"></a><span class="lineno"> 1414</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01415"></a><span class="lineno"> 1415</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01416"></a><span class="lineno"> 1416</span>  operator==(<span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept</div><div class="line"><a name="l01417"></a><span class="lineno"> 1417</span>  { <span class="keywordflow">return</span> !__a; }</div><div class="line"><a name="l01418"></a><span class="lineno"> 1418</span> </div><div class="line"><a name="l01419"></a><span class="lineno"> 1419</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01420"></a><span class="lineno"> 1420</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01421"></a><span class="lineno"> 1421</span>  operator==(nullptr_t, <span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __a) noexcept</div><div class="line"><a name="l01422"></a><span class="lineno"> 1422</span>  { <span class="keywordflow">return</span> !__a; }</div><div class="line"><a name="l01423"></a><span class="lineno"> 1423</span> </div><div class="line"><a name="l01424"></a><span class="lineno"> 1424</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1, <span class="keyword">typename</span> _Tp2, _Lock_policy _Lp></div><div class="line"><a name="l01425"></a><span class="lineno"> 1425</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01426"></a><span class="lineno"> 1426</span>  operator!=(<span class="keyword">const</span> __shared_ptr<_Tp1, _Lp>& __a,</div><div class="line"><a name="l01427"></a><span class="lineno"> 1427</span>  <span class="keyword">const</span> __shared_ptr<_Tp2, _Lp>& __b) noexcept</div><div class="line"><a name="l01428"></a><span class="lineno"> 1428</span>  { <span class="keywordflow">return</span> __a.get() != __b.get(); }</div><div class="line"><a name="l01429"></a><span class="lineno"> 1429</span> </div><div class="line"><a name="l01430"></a><span class="lineno"> 1430</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01431"></a><span class="lineno"> 1431</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01432"></a><span class="lineno"> 1432</span>  operator!=(<span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept</div><div class="line"><a name="l01433"></a><span class="lineno"> 1433</span>  { <span class="keywordflow">return</span> (<span class="keywordtype">bool</span>)__a; }</div><div class="line"><a name="l01434"></a><span class="lineno"> 1434</span> </div><div class="line"><a name="l01435"></a><span class="lineno"> 1435</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01436"></a><span class="lineno"> 1436</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01437"></a><span class="lineno"> 1437</span>  operator!=(nullptr_t, <span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __a) noexcept</div><div class="line"><a name="l01438"></a><span class="lineno"> 1438</span>  { <span class="keywordflow">return</span> (<span class="keywordtype">bool</span>)__a; }</div><div class="line"><a name="l01439"></a><span class="lineno"> 1439</span> </div><div class="line"><a name="l01440"></a><span class="lineno"> 1440</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Up, _Lock_policy _Lp></div><div class="line"><a name="l01441"></a><span class="lineno"> 1441</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01442"></a><span class="lineno"> 1442</span>  operator<(<span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __a,</div><div class="line"><a name="l01443"></a><span class="lineno"> 1443</span>  <span class="keyword">const</span> __shared_ptr<_Up, _Lp>& __b) noexcept</div><div class="line"><a name="l01444"></a><span class="lineno"> 1444</span>  {</div><div class="line"><a name="l01445"></a><span class="lineno"> 1445</span>  <span class="keyword">using</span> _Tp_elt = <span class="keyword">typename</span> __shared_ptr<_Tp, _Lp>::element_type;</div><div class="line"><a name="l01446"></a><span class="lineno"> 1446</span>  <span class="keyword">using</span> _Up_elt = <span class="keyword">typename</span> __shared_ptr<_Up, _Lp>::element_type;</div><div class="line"><a name="l01447"></a><span class="lineno"> 1447</span>  <span class="keyword">using</span> _Vp = <span class="keyword">typename</span> common_type<_Tp_elt*, _Up_elt*>::type;</div><div class="line"><a name="l01448"></a><span class="lineno"> 1448</span>  <span class="keywordflow">return</span> less<_Vp>()(__a.get(), __b.get());</div><div class="line"><a name="l01449"></a><span class="lineno"> 1449</span>  }</div><div class="line"><a name="l01450"></a><span class="lineno"> 1450</span> </div><div class="line"><a name="l01451"></a><span class="lineno"> 1451</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01452"></a><span class="lineno"> 1452</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01453"></a><span class="lineno"> 1453</span>  operator<(<span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept</div><div class="line"><a name="l01454"></a><span class="lineno"> 1454</span>  {</div><div class="line"><a name="l01455"></a><span class="lineno"> 1455</span>  <span class="keyword">using</span> _Tp_elt = <span class="keyword">typename</span> __shared_ptr<_Tp, _Lp>::element_type;</div><div class="line"><a name="l01456"></a><span class="lineno"> 1456</span>  <span class="keywordflow">return</span> less<_Tp_elt*>()(__a.get(), <span class="keyword">nullptr</span>);</div><div class="line"><a name="l01457"></a><span class="lineno"> 1457</span>  }</div><div class="line"><a name="l01458"></a><span class="lineno"> 1458</span> </div><div class="line"><a name="l01459"></a><span class="lineno"> 1459</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01460"></a><span class="lineno"> 1460</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01461"></a><span class="lineno"> 1461</span>  operator<(nullptr_t, <span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __a) noexcept</div><div class="line"><a name="l01462"></a><span class="lineno"> 1462</span>  {</div><div class="line"><a name="l01463"></a><span class="lineno"> 1463</span>  <span class="keyword">using</span> _Tp_elt = <span class="keyword">typename</span> __shared_ptr<_Tp, _Lp>::element_type;</div><div class="line"><a name="l01464"></a><span class="lineno"> 1464</span>  <span class="keywordflow">return</span> less<_Tp_elt*>()(<span class="keyword">nullptr</span>, __a.get());</div><div class="line"><a name="l01465"></a><span class="lineno"> 1465</span>  }</div><div class="line"><a name="l01466"></a><span class="lineno"> 1466</span> </div><div class="line"><a name="l01467"></a><span class="lineno"> 1467</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1, <span class="keyword">typename</span> _Tp2, _Lock_policy _Lp></div><div class="line"><a name="l01468"></a><span class="lineno"> 1468</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01469"></a><span class="lineno"> 1469</span>  operator<=(<span class="keyword">const</span> __shared_ptr<_Tp1, _Lp>& __a,</div><div class="line"><a name="l01470"></a><span class="lineno"> 1470</span>  <span class="keyword">const</span> __shared_ptr<_Tp2, _Lp>& __b) noexcept</div><div class="line"><a name="l01471"></a><span class="lineno"> 1471</span>  { <span class="keywordflow">return</span> !(__b < __a); }</div><div class="line"><a name="l01472"></a><span class="lineno"> 1472</span> </div><div class="line"><a name="l01473"></a><span class="lineno"> 1473</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01474"></a><span class="lineno"> 1474</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01475"></a><span class="lineno"> 1475</span>  operator<=(<span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept</div><div class="line"><a name="l01476"></a><span class="lineno"> 1476</span>  { <span class="keywordflow">return</span> !(<span class="keyword">nullptr</span> < __a); }</div><div class="line"><a name="l01477"></a><span class="lineno"> 1477</span> </div><div class="line"><a name="l01478"></a><span class="lineno"> 1478</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01479"></a><span class="lineno"> 1479</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01480"></a><span class="lineno"> 1480</span>  operator<=(nullptr_t, <span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __a) noexcept</div><div class="line"><a name="l01481"></a><span class="lineno"> 1481</span>  { <span class="keywordflow">return</span> !(__a < <span class="keyword">nullptr</span>); }</div><div class="line"><a name="l01482"></a><span class="lineno"> 1482</span> </div><div class="line"><a name="l01483"></a><span class="lineno"> 1483</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1, <span class="keyword">typename</span> _Tp2, _Lock_policy _Lp></div><div class="line"><a name="l01484"></a><span class="lineno"> 1484</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01485"></a><span class="lineno"> 1485</span>  operator>(<span class="keyword">const</span> __shared_ptr<_Tp1, _Lp>& __a,</div><div class="line"><a name="l01486"></a><span class="lineno"> 1486</span>  <span class="keyword">const</span> __shared_ptr<_Tp2, _Lp>& __b) noexcept</div><div class="line"><a name="l01487"></a><span class="lineno"> 1487</span>  { <span class="keywordflow">return</span> (__b < __a); }</div><div class="line"><a name="l01488"></a><span class="lineno"> 1488</span> </div><div class="line"><a name="l01489"></a><span class="lineno"> 1489</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01490"></a><span class="lineno"> 1490</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01491"></a><span class="lineno"> 1491</span>  operator>(<span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept</div><div class="line"><a name="l01492"></a><span class="lineno"> 1492</span>  { <span class="keywordflow">return</span> <span class="keyword">nullptr</span> < __a; }</div><div class="line"><a name="l01493"></a><span class="lineno"> 1493</span> </div><div class="line"><a name="l01494"></a><span class="lineno"> 1494</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01495"></a><span class="lineno"> 1495</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01496"></a><span class="lineno"> 1496</span>  operator>(nullptr_t, <span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __a) noexcept</div><div class="line"><a name="l01497"></a><span class="lineno"> 1497</span>  { <span class="keywordflow">return</span> __a < <span class="keyword">nullptr</span>; }</div><div class="line"><a name="l01498"></a><span class="lineno"> 1498</span> </div><div class="line"><a name="l01499"></a><span class="lineno"> 1499</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1, <span class="keyword">typename</span> _Tp2, _Lock_policy _Lp></div><div class="line"><a name="l01500"></a><span class="lineno"> 1500</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01501"></a><span class="lineno"> 1501</span>  operator>=(<span class="keyword">const</span> __shared_ptr<_Tp1, _Lp>& __a,</div><div class="line"><a name="l01502"></a><span class="lineno"> 1502</span>  <span class="keyword">const</span> __shared_ptr<_Tp2, _Lp>& __b) noexcept</div><div class="line"><a name="l01503"></a><span class="lineno"> 1503</span>  { <span class="keywordflow">return</span> !(__a < __b); }</div><div class="line"><a name="l01504"></a><span class="lineno"> 1504</span> </div><div class="line"><a name="l01505"></a><span class="lineno"> 1505</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01506"></a><span class="lineno"> 1506</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01507"></a><span class="lineno"> 1507</span>  operator>=(<span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept</div><div class="line"><a name="l01508"></a><span class="lineno"> 1508</span>  { <span class="keywordflow">return</span> !(__a < <span class="keyword">nullptr</span>); }</div><div class="line"><a name="l01509"></a><span class="lineno"> 1509</span> </div><div class="line"><a name="l01510"></a><span class="lineno"> 1510</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01511"></a><span class="lineno"> 1511</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l01512"></a><span class="lineno"> 1512</span>  operator>=(nullptr_t, <span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __a) noexcept</div><div class="line"><a name="l01513"></a><span class="lineno"> 1513</span>  { <span class="keywordflow">return</span> !(<span class="keyword">nullptr</span> < __a); }</div><div class="line"><a name="l01514"></a><span class="lineno"> 1514</span> </div><div class="line"><a name="l01515"></a><span class="lineno"> 1515</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Sp></div><div class="line"><a name="l01516"></a><span class="lineno"> 1516</span>  <span class="keyword">struct </span>_Sp_less : <span class="keyword">public</span> binary_function<_Sp, _Sp, bool></div><div class="line"><a name="l01517"></a><span class="lineno"> 1517</span>  {</div><div class="line"><a name="l01518"></a><span class="lineno"> 1518</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l01519"></a><span class="lineno"> 1519</span>  operator()(<span class="keyword">const</span> _Sp& __lhs, <span class="keyword">const</span> _Sp& __rhs) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l01520"></a><span class="lineno"> 1520</span>  {</div><div class="line"><a name="l01521"></a><span class="lineno"> 1521</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> _Sp::element_type element_type;</div><div class="line"><a name="l01522"></a><span class="lineno"> 1522</span>  <span class="keywordflow">return</span> <a class="code" href="a07376.html">std::less<element_type*></a>()(__lhs.get(), __rhs.get());</div><div class="line"><a name="l01523"></a><span class="lineno"> 1523</span>  }</div><div class="line"><a name="l01524"></a><span class="lineno"> 1524</span>  };</div><div class="line"><a name="l01525"></a><span class="lineno"> 1525</span> </div><div class="line"><a name="l01526"></a><span class="lineno"> 1526</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01527"></a><span class="lineno"> 1527</span>  <span class="keyword">struct </span>less<__shared_ptr<_Tp, _Lp>></div><div class="line"><a name="l01528"></a><span class="lineno"> 1528</span>  : <span class="keyword">public</span> _Sp_less<__shared_ptr<_Tp, _Lp>></div><div class="line"><a name="l01529"></a><span class="lineno"> 1529</span>  { };</div><div class="line"><a name="l01530"></a><span class="lineno"> 1530</span> </div><div class="line"><a name="l01531"></a><span class="lineno"> 1531</span>  <span class="comment">// 20.7.2.2.8 shared_ptr specialized algorithms.</span></div><div class="line"><a name="l01532"></a><span class="lineno"> 1532</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01533"></a><span class="lineno"> 1533</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l01534"></a><span class="lineno"> 1534</span>  swap(__shared_ptr<_Tp, _Lp>& __a, __shared_ptr<_Tp, _Lp>& __b) noexcept</div><div class="line"><a name="l01535"></a><span class="lineno"> 1535</span>  { __a.swap(__b); }</div><div class="line"><a name="l01536"></a><span class="lineno"> 1536</span> </div><div class="line"><a name="l01537"></a><span class="lineno"> 1537</span>  <span class="comment">// 20.7.2.2.9 shared_ptr casts</span></div><div class="line"><a name="l01538"></a><span class="lineno"> 1538</span> </div><div class="line"><a name="l01539"></a><span class="lineno"> 1539</span>  <span class="comment">// The seemingly equivalent code:</span></div><div class="line"><a name="l01540"></a><span class="lineno"> 1540</span>  <span class="comment">// shared_ptr<_Tp, _Lp>(static_cast<_Tp*>(__r.get()))</span></div><div class="line"><a name="l01541"></a><span class="lineno"> 1541</span>  <span class="comment">// will eventually result in undefined behaviour, attempting to</span></div><div class="line"><a name="l01542"></a><span class="lineno"> 1542</span>  <span class="comment">// delete the same object twice.</span><span class="comment"></span></div><div class="line"><a name="l01543"></a><span class="lineno"> 1543</span> <span class="comment"> /// static_pointer_cast</span></div><div class="line"><a name="l01544"></a><span class="lineno"> 1544</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Tp1, _Lock_policy _Lp></div><div class="line"><a name="l01545"></a><span class="lineno"> 1545</span>  <span class="keyword">inline</span> __shared_ptr<_Tp, _Lp></div><div class="line"><a name="l01546"></a><span class="lineno"><a class="line" href="a01538.html#a6a221c308f0ca0e44b5fffa32a6d4595"> 1546</a></span>  static_pointer_cast(<span class="keyword">const</span> __shared_ptr<_Tp1, _Lp>& __r) noexcept</div><div class="line"><a name="l01547"></a><span class="lineno"> 1547</span>  {</div><div class="line"><a name="l01548"></a><span class="lineno"> 1548</span>  <span class="keyword">using</span> _Sp = __shared_ptr<_Tp, _Lp>;</div><div class="line"><a name="l01549"></a><span class="lineno"> 1549</span>  <span class="keywordflow">return</span> _Sp(__r, static_cast<typename _Sp::element_type*>(__r.get()));</div><div class="line"><a name="l01550"></a><span class="lineno"> 1550</span>  }</div><div class="line"><a name="l01551"></a><span class="lineno"> 1551</span> </div><div class="line"><a name="l01552"></a><span class="lineno"> 1552</span>  <span class="comment">// The seemingly equivalent code:</span></div><div class="line"><a name="l01553"></a><span class="lineno"> 1553</span>  <span class="comment">// shared_ptr<_Tp, _Lp>(const_cast<_Tp*>(__r.get()))</span></div><div class="line"><a name="l01554"></a><span class="lineno"> 1554</span>  <span class="comment">// will eventually result in undefined behaviour, attempting to</span></div><div class="line"><a name="l01555"></a><span class="lineno"> 1555</span>  <span class="comment">// delete the same object twice.</span><span class="comment"></span></div><div class="line"><a name="l01556"></a><span class="lineno"> 1556</span> <span class="comment"> /// const_pointer_cast</span></div><div class="line"><a name="l01557"></a><span class="lineno"> 1557</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Tp1, _Lock_policy _Lp></div><div class="line"><a name="l01558"></a><span class="lineno"> 1558</span>  <span class="keyword">inline</span> __shared_ptr<_Tp, _Lp></div><div class="line"><a name="l01559"></a><span class="lineno"><a class="line" href="a01538.html#aa2f97c555285b7c2e771b789ccd7b126"> 1559</a></span>  const_pointer_cast(<span class="keyword">const</span> __shared_ptr<_Tp1, _Lp>& __r) noexcept</div><div class="line"><a name="l01560"></a><span class="lineno"> 1560</span>  {</div><div class="line"><a name="l01561"></a><span class="lineno"> 1561</span>  <span class="keyword">using</span> _Sp = __shared_ptr<_Tp, _Lp>;</div><div class="line"><a name="l01562"></a><span class="lineno"> 1562</span>  <span class="keywordflow">return</span> _Sp(__r, const_cast<typename _Sp::element_type*>(__r.get()));</div><div class="line"><a name="l01563"></a><span class="lineno"> 1563</span>  }</div><div class="line"><a name="l01564"></a><span class="lineno"> 1564</span> </div><div class="line"><a name="l01565"></a><span class="lineno"> 1565</span>  <span class="comment">// The seemingly equivalent code:</span></div><div class="line"><a name="l01566"></a><span class="lineno"> 1566</span>  <span class="comment">// shared_ptr<_Tp, _Lp>(dynamic_cast<_Tp*>(__r.get()))</span></div><div class="line"><a name="l01567"></a><span class="lineno"> 1567</span>  <span class="comment">// will eventually result in undefined behaviour, attempting to</span></div><div class="line"><a name="l01568"></a><span class="lineno"> 1568</span>  <span class="comment">// delete the same object twice.</span><span class="comment"></span></div><div class="line"><a name="l01569"></a><span class="lineno"> 1569</span> <span class="comment"> /// dynamic_pointer_cast</span></div><div class="line"><a name="l01570"></a><span class="lineno"> 1570</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Tp1, _Lock_policy _Lp></div><div class="line"><a name="l01571"></a><span class="lineno"> 1571</span>  <span class="keyword">inline</span> __shared_ptr<_Tp, _Lp></div><div class="line"><a name="l01572"></a><span class="lineno"><a class="line" href="a01538.html#aea22d7ec8d3648b381cf98d0ba570e9b"> 1572</a></span>  dynamic_pointer_cast(<span class="keyword">const</span> __shared_ptr<_Tp1, _Lp>& __r) noexcept</div><div class="line"><a name="l01573"></a><span class="lineno"> 1573</span>  {</div><div class="line"><a name="l01574"></a><span class="lineno"> 1574</span>  <span class="keyword">using</span> _Sp = __shared_ptr<_Tp, _Lp>;</div><div class="line"><a name="l01575"></a><span class="lineno"> 1575</span>  <span class="keywordflow">if</span> (<span class="keyword">auto</span>* __p = dynamic_cast<typename _Sp::element_type*>(__r.get()))</div><div class="line"><a name="l01576"></a><span class="lineno"> 1576</span>  <span class="keywordflow">return</span> _Sp(__r, __p);</div><div class="line"><a name="l01577"></a><span class="lineno"> 1577</span>  <span class="keywordflow">return</span> _Sp();</div><div class="line"><a name="l01578"></a><span class="lineno"> 1578</span>  }</div><div class="line"><a name="l01579"></a><span class="lineno"> 1579</span> </div><div class="line"><a name="l01580"></a><span class="lineno"> 1580</span> <span class="preprocessor">#if __cplusplus > 201402L</span></div><div class="line"><a name="l01581"></a><span class="lineno"> 1581</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Tp1, _Lock_policy _Lp></div><div class="line"><a name="l01582"></a><span class="lineno"> 1582</span>  <span class="keyword">inline</span> __shared_ptr<_Tp, _Lp></div><div class="line"><a name="l01583"></a><span class="lineno"> 1583</span>  reinterpret_pointer_cast(<span class="keyword">const</span> __shared_ptr<_Tp1, _Lp>& __r) noexcept</div><div class="line"><a name="l01584"></a><span class="lineno"> 1584</span>  {</div><div class="line"><a name="l01585"></a><span class="lineno"> 1585</span>  <span class="keyword">using</span> _Sp = __shared_ptr<_Tp, _Lp>;</div><div class="line"><a name="l01586"></a><span class="lineno"> 1586</span>  <span class="keywordflow">return</span> _Sp(__r, reinterpret_cast<typename _Sp::element_type*>(__r.get()));</div><div class="line"><a name="l01587"></a><span class="lineno"> 1587</span>  }</div><div class="line"><a name="l01588"></a><span class="lineno"> 1588</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l01589"></a><span class="lineno"> 1589</span> </div><div class="line"><a name="l01590"></a><span class="lineno"> 1590</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01591"></a><span class="lineno"> 1591</span>  <span class="keyword">class </span>__weak_ptr</div><div class="line"><a name="l01592"></a><span class="lineno"> 1592</span>  {</div><div class="line"><a name="l01593"></a><span class="lineno"> 1593</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Res = <span class="keywordtype">void</span>></div><div class="line"><a name="l01594"></a><span class="lineno"> 1594</span>  <span class="keyword">using</span> _Compatible = <span class="keyword">typename</span></div><div class="line"><a name="l01595"></a><span class="lineno"> 1595</span>  enable_if<__sp_compatible_with<_Yp*, _Tp*>::value, _Res>::type;</div><div class="line"><a name="l01596"></a><span class="lineno"> 1596</span> </div><div class="line"><a name="l01597"></a><span class="lineno"> 1597</span>  <span class="comment">// Constraint for assignment from shared_ptr and weak_ptr:</span></div><div class="line"><a name="l01598"></a><span class="lineno"> 1598</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l01599"></a><span class="lineno"> 1599</span>  <span class="keyword">using</span> _Assignable = _Compatible<_Yp, __weak_ptr&>;</div><div class="line"><a name="l01600"></a><span class="lineno"> 1600</span> </div><div class="line"><a name="l01601"></a><span class="lineno"> 1601</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l01602"></a><span class="lineno"> 1602</span>  <span class="keyword">using</span> element_type = <span class="keyword">typename</span> remove_extent<_Tp>::type;</div><div class="line"><a name="l01603"></a><span class="lineno"> 1603</span> </div><div class="line"><a name="l01604"></a><span class="lineno"> 1604</span>  constexpr __weak_ptr() noexcept</div><div class="line"><a name="l01605"></a><span class="lineno"> 1605</span>  : _M_ptr(<span class="keywordtype">nullptr</span>), _M_refcount()</div><div class="line"><a name="l01606"></a><span class="lineno"> 1606</span>  { }</div><div class="line"><a name="l01607"></a><span class="lineno"> 1607</span> </div><div class="line"><a name="l01608"></a><span class="lineno"> 1608</span>  __weak_ptr(<span class="keyword">const</span> __weak_ptr&) noexcept = <span class="keywordflow">default</span>;</div><div class="line"><a name="l01609"></a><span class="lineno"> 1609</span> </div><div class="line"><a name="l01610"></a><span class="lineno"> 1610</span>  ~__weak_ptr() = <span class="keywordflow">default</span>;</div><div class="line"><a name="l01611"></a><span class="lineno"> 1611</span> </div><div class="line"><a name="l01612"></a><span class="lineno"> 1612</span>  <span class="comment">// The "obvious" converting constructor implementation:</span></div><div class="line"><a name="l01613"></a><span class="lineno"> 1613</span>  <span class="comment">//</span></div><div class="line"><a name="l01614"></a><span class="lineno"> 1614</span>  <span class="comment">// template<typename _Tp1></span></div><div class="line"><a name="l01615"></a><span class="lineno"> 1615</span>  <span class="comment">// __weak_ptr(const __weak_ptr<_Tp1, _Lp>& __r)</span></div><div class="line"><a name="l01616"></a><span class="lineno"> 1616</span>  <span class="comment">// : _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount) // never throws</span></div><div class="line"><a name="l01617"></a><span class="lineno"> 1617</span>  <span class="comment">// { }</span></div><div class="line"><a name="l01618"></a><span class="lineno"> 1618</span>  <span class="comment">//</span></div><div class="line"><a name="l01619"></a><span class="lineno"> 1619</span>  <span class="comment">// has a serious problem.</span></div><div class="line"><a name="l01620"></a><span class="lineno"> 1620</span>  <span class="comment">//</span></div><div class="line"><a name="l01621"></a><span class="lineno"> 1621</span>  <span class="comment">// __r._M_ptr may already have been invalidated. The _M_ptr(__r._M_ptr)</span></div><div class="line"><a name="l01622"></a><span class="lineno"> 1622</span>  <span class="comment">// conversion may require access to *__r._M_ptr (virtual inheritance).</span></div><div class="line"><a name="l01623"></a><span class="lineno"> 1623</span>  <span class="comment">//</span></div><div class="line"><a name="l01624"></a><span class="lineno"> 1624</span>  <span class="comment">// It is not possible to avoid spurious access violations since</span></div><div class="line"><a name="l01625"></a><span class="lineno"> 1625</span>  <span class="comment">// in multithreaded programs __r._M_ptr may be invalidated at any point.</span></div><div class="line"><a name="l01626"></a><span class="lineno"> 1626</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _Compatible<_Yp>></div><div class="line"><a name="l01627"></a><span class="lineno"> 1627</span>  __weak_ptr(<span class="keyword">const</span> __weak_ptr<_Yp, _Lp>& __r) noexcept</div><div class="line"><a name="l01628"></a><span class="lineno"> 1628</span>  : _M_refcount(__r._M_refcount)</div><div class="line"><a name="l01629"></a><span class="lineno"> 1629</span>  { _M_ptr = __r.lock().get(); }</div><div class="line"><a name="l01630"></a><span class="lineno"> 1630</span> </div><div class="line"><a name="l01631"></a><span class="lineno"> 1631</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _Compatible<_Yp>></div><div class="line"><a name="l01632"></a><span class="lineno"> 1632</span>  __weak_ptr(<span class="keyword">const</span> __shared_ptr<_Yp, _Lp>& __r) noexcept</div><div class="line"><a name="l01633"></a><span class="lineno"> 1633</span>  : _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount)</div><div class="line"><a name="l01634"></a><span class="lineno"> 1634</span>  { }</div><div class="line"><a name="l01635"></a><span class="lineno"> 1635</span> </div><div class="line"><a name="l01636"></a><span class="lineno"> 1636</span>  __weak_ptr(__weak_ptr&& __r) noexcept</div><div class="line"><a name="l01637"></a><span class="lineno"> 1637</span>  : _M_ptr(__r._M_ptr), _M_refcount(std::move(__r._M_refcount))</div><div class="line"><a name="l01638"></a><span class="lineno"> 1638</span>  { __r._M_ptr = <span class="keyword">nullptr</span>; }</div><div class="line"><a name="l01639"></a><span class="lineno"> 1639</span> </div><div class="line"><a name="l01640"></a><span class="lineno"> 1640</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _Compatible<_Yp>></div><div class="line"><a name="l01641"></a><span class="lineno"> 1641</span>  __weak_ptr(__weak_ptr<_Yp, _Lp>&& __r) noexcept</div><div class="line"><a name="l01642"></a><span class="lineno"> 1642</span>  : _M_ptr(__r.lock().get()), _M_refcount(std::move(__r._M_refcount))</div><div class="line"><a name="l01643"></a><span class="lineno"> 1643</span>  { __r._M_ptr = <span class="keyword">nullptr</span>; }</div><div class="line"><a name="l01644"></a><span class="lineno"> 1644</span> </div><div class="line"><a name="l01645"></a><span class="lineno"> 1645</span>  __weak_ptr&</div><div class="line"><a name="l01646"></a><span class="lineno"> 1646</span>  operator=(<span class="keyword">const</span> __weak_ptr& __r) noexcept = <span class="keywordflow">default</span>;</div><div class="line"><a name="l01647"></a><span class="lineno"> 1647</span> </div><div class="line"><a name="l01648"></a><span class="lineno"> 1648</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l01649"></a><span class="lineno"> 1649</span>  _Assignable<_Yp></div><div class="line"><a name="l01650"></a><span class="lineno"> 1650</span>  operator=(<span class="keyword">const</span> __weak_ptr<_Yp, _Lp>& __r) noexcept</div><div class="line"><a name="l01651"></a><span class="lineno"> 1651</span>  {</div><div class="line"><a name="l01652"></a><span class="lineno"> 1652</span>  _M_ptr = __r.lock().get();</div><div class="line"><a name="l01653"></a><span class="lineno"> 1653</span>  _M_refcount = __r._M_refcount;</div><div class="line"><a name="l01654"></a><span class="lineno"> 1654</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l01655"></a><span class="lineno"> 1655</span>  }</div><div class="line"><a name="l01656"></a><span class="lineno"> 1656</span> </div><div class="line"><a name="l01657"></a><span class="lineno"> 1657</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l01658"></a><span class="lineno"> 1658</span>  _Assignable<_Yp></div><div class="line"><a name="l01659"></a><span class="lineno"> 1659</span>  operator=(<span class="keyword">const</span> __shared_ptr<_Yp, _Lp>& __r) noexcept</div><div class="line"><a name="l01660"></a><span class="lineno"> 1660</span>  {</div><div class="line"><a name="l01661"></a><span class="lineno"> 1661</span>  _M_ptr = __r._M_ptr;</div><div class="line"><a name="l01662"></a><span class="lineno"> 1662</span>  _M_refcount = __r._M_refcount;</div><div class="line"><a name="l01663"></a><span class="lineno"> 1663</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l01664"></a><span class="lineno"> 1664</span>  }</div><div class="line"><a name="l01665"></a><span class="lineno"> 1665</span> </div><div class="line"><a name="l01666"></a><span class="lineno"> 1666</span>  __weak_ptr&</div><div class="line"><a name="l01667"></a><span class="lineno"> 1667</span>  operator=(__weak_ptr&& __r) noexcept</div><div class="line"><a name="l01668"></a><span class="lineno"> 1668</span>  {</div><div class="line"><a name="l01669"></a><span class="lineno"> 1669</span>  _M_ptr = __r._M_ptr;</div><div class="line"><a name="l01670"></a><span class="lineno"> 1670</span>  _M_refcount = std::move(__r._M_refcount);</div><div class="line"><a name="l01671"></a><span class="lineno"> 1671</span>  __r._M_ptr = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l01672"></a><span class="lineno"> 1672</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l01673"></a><span class="lineno"> 1673</span>  }</div><div class="line"><a name="l01674"></a><span class="lineno"> 1674</span> </div><div class="line"><a name="l01675"></a><span class="lineno"> 1675</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l01676"></a><span class="lineno"> 1676</span>  _Assignable<_Yp></div><div class="line"><a name="l01677"></a><span class="lineno"> 1677</span>  operator=(__weak_ptr<_Yp, _Lp>&& __r) noexcept</div><div class="line"><a name="l01678"></a><span class="lineno"> 1678</span>  {</div><div class="line"><a name="l01679"></a><span class="lineno"> 1679</span>  _M_ptr = __r.lock().get();</div><div class="line"><a name="l01680"></a><span class="lineno"> 1680</span>  _M_refcount = std::move(__r._M_refcount);</div><div class="line"><a name="l01681"></a><span class="lineno"> 1681</span>  __r._M_ptr = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l01682"></a><span class="lineno"> 1682</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l01683"></a><span class="lineno"> 1683</span>  }</div><div class="line"><a name="l01684"></a><span class="lineno"> 1684</span> </div><div class="line"><a name="l01685"></a><span class="lineno"> 1685</span>  __shared_ptr<_Tp, _Lp></div><div class="line"><a name="l01686"></a><span class="lineno"> 1686</span>  <a class="code" href="a01538.html#a82fa606b1427f731ac64bb8ac49221f3">lock</a>() const noexcept</div><div class="line"><a name="l01687"></a><span class="lineno"> 1687</span>  { <span class="keywordflow">return</span> __shared_ptr<element_type, _Lp>(*<span class="keyword">this</span>, std::nothrow); }</div><div class="line"><a name="l01688"></a><span class="lineno"> 1688</span> </div><div class="line"><a name="l01689"></a><span class="lineno"> 1689</span>  <span class="keywordtype">long</span></div><div class="line"><a name="l01690"></a><span class="lineno"> 1690</span>  use_count() const noexcept</div><div class="line"><a name="l01691"></a><span class="lineno"> 1691</span>  { <span class="keywordflow">return</span> _M_refcount._M_get_use_count(); }</div><div class="line"><a name="l01692"></a><span class="lineno"> 1692</span> </div><div class="line"><a name="l01693"></a><span class="lineno"> 1693</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l01694"></a><span class="lineno"> 1694</span>  expired() const noexcept</div><div class="line"><a name="l01695"></a><span class="lineno"> 1695</span>  { <span class="keywordflow">return</span> _M_refcount._M_get_use_count() == 0; }</div><div class="line"><a name="l01696"></a><span class="lineno"> 1696</span> </div><div class="line"><a name="l01697"></a><span class="lineno"> 1697</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1></div><div class="line"><a name="l01698"></a><span class="lineno"> 1698</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l01699"></a><span class="lineno"> 1699</span>  owner_before(<span class="keyword">const</span> __shared_ptr<_Tp1, _Lp>& __rhs) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l01700"></a><span class="lineno"> 1700</span>  { <span class="keywordflow">return</span> _M_refcount._M_less(__rhs._M_refcount); }</div><div class="line"><a name="l01701"></a><span class="lineno"> 1701</span> </div><div class="line"><a name="l01702"></a><span class="lineno"> 1702</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1></div><div class="line"><a name="l01703"></a><span class="lineno"> 1703</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l01704"></a><span class="lineno"> 1704</span>  owner_before(<span class="keyword">const</span> __weak_ptr<_Tp1, _Lp>& __rhs) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l01705"></a><span class="lineno"> 1705</span>  { <span class="keywordflow">return</span> _M_refcount._M_less(__rhs._M_refcount); }</div><div class="line"><a name="l01706"></a><span class="lineno"> 1706</span> </div><div class="line"><a name="l01707"></a><span class="lineno"> 1707</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l01708"></a><span class="lineno"> 1708</span>  reset() noexcept</div><div class="line"><a name="l01709"></a><span class="lineno"> 1709</span>  { __weak_ptr().swap(*<span class="keyword">this</span>); }</div><div class="line"><a name="l01710"></a><span class="lineno"> 1710</span> </div><div class="line"><a name="l01711"></a><span class="lineno"> 1711</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l01712"></a><span class="lineno"> 1712</span>  swap(__weak_ptr& __s) noexcept</div><div class="line"><a name="l01713"></a><span class="lineno"> 1713</span>  {</div><div class="line"><a name="l01714"></a><span class="lineno"> 1714</span>  std::swap(_M_ptr, __s._M_ptr);</div><div class="line"><a name="l01715"></a><span class="lineno"> 1715</span>  _M_refcount._M_swap(__s._M_refcount);</div><div class="line"><a name="l01716"></a><span class="lineno"> 1716</span>  }</div><div class="line"><a name="l01717"></a><span class="lineno"> 1717</span> </div><div class="line"><a name="l01718"></a><span class="lineno"> 1718</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l01719"></a><span class="lineno"> 1719</span>  <span class="comment">// Used by __enable_shared_from_this.</span></div><div class="line"><a name="l01720"></a><span class="lineno"> 1720</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l01721"></a><span class="lineno"> 1721</span>  _M_assign(_Tp* __ptr, <span class="keyword">const</span> __shared_count<_Lp>& __refcount) noexcept</div><div class="line"><a name="l01722"></a><span class="lineno"> 1722</span>  {</div><div class="line"><a name="l01723"></a><span class="lineno"> 1723</span>  <span class="keywordflow">if</span> (use_count() == 0)</div><div class="line"><a name="l01724"></a><span class="lineno"> 1724</span>  {</div><div class="line"><a name="l01725"></a><span class="lineno"> 1725</span>  _M_ptr = __ptr;</div><div class="line"><a name="l01726"></a><span class="lineno"> 1726</span>  _M_refcount = __refcount;</div><div class="line"><a name="l01727"></a><span class="lineno"> 1727</span>  }</div><div class="line"><a name="l01728"></a><span class="lineno"> 1728</span>  }</div><div class="line"><a name="l01729"></a><span class="lineno"> 1729</span> </div><div class="line"><a name="l01730"></a><span class="lineno"> 1730</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1, _Lock_policy _Lp1> <span class="keyword">friend</span> <span class="keyword">class </span>__shared_ptr;</div><div class="line"><a name="l01731"></a><span class="lineno"> 1731</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1, _Lock_policy _Lp1> <span class="keyword">friend</span> <span class="keyword">class </span>__weak_ptr;</div><div class="line"><a name="l01732"></a><span class="lineno"> 1732</span>  <span class="keyword">friend</span> <span class="keyword">class </span>__enable_shared_from_this<_Tp, _Lp>;</div><div class="line"><a name="l01733"></a><span class="lineno"> 1733</span>  <span class="keyword">friend</span> <span class="keyword">class </span>enable_shared_from_this<_Tp>;</div><div class="line"><a name="l01734"></a><span class="lineno"> 1734</span> </div><div class="line"><a name="l01735"></a><span class="lineno"> 1735</span>  element_type* _M_ptr; <span class="comment">// Contained pointer.</span></div><div class="line"><a name="l01736"></a><span class="lineno"> 1736</span>  __weak_count<_Lp> _M_refcount; <span class="comment">// Reference counter.</span></div><div class="line"><a name="l01737"></a><span class="lineno"> 1737</span>  };</div><div class="line"><a name="l01738"></a><span class="lineno"> 1738</span> </div><div class="line"><a name="l01739"></a><span class="lineno"> 1739</span>  <span class="comment">// 20.7.2.3.6 weak_ptr specialized algorithms.</span></div><div class="line"><a name="l01740"></a><span class="lineno"> 1740</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01741"></a><span class="lineno"> 1741</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l01742"></a><span class="lineno"> 1742</span>  swap(__weak_ptr<_Tp, _Lp>& __a, __weak_ptr<_Tp, _Lp>& __b) noexcept</div><div class="line"><a name="l01743"></a><span class="lineno"> 1743</span>  { __a.swap(__b); }</div><div class="line"><a name="l01744"></a><span class="lineno"> 1744</span> </div><div class="line"><a name="l01745"></a><span class="lineno"> 1745</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Tp1></div><div class="line"><a name="l01746"></a><span class="lineno"> 1746</span>  <span class="keyword">struct </span>_Sp_owner_less : <span class="keyword">public</span> binary_function<_Tp, _Tp, bool></div><div class="line"><a name="l01747"></a><span class="lineno"> 1747</span>  {</div><div class="line"><a name="l01748"></a><span class="lineno"> 1748</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l01749"></a><span class="lineno"> 1749</span>  operator()(<span class="keyword">const</span> _Tp& __lhs, <span class="keyword">const</span> _Tp& __rhs) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l01750"></a><span class="lineno"> 1750</span>  { <span class="keywordflow">return</span> __lhs.owner_before(__rhs); }</div><div class="line"><a name="l01751"></a><span class="lineno"> 1751</span> </div><div class="line"><a name="l01752"></a><span class="lineno"> 1752</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l01753"></a><span class="lineno"> 1753</span>  operator()(<span class="keyword">const</span> _Tp& __lhs, <span class="keyword">const</span> _Tp1& __rhs) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l01754"></a><span class="lineno"> 1754</span>  { <span class="keywordflow">return</span> __lhs.owner_before(__rhs); }</div><div class="line"><a name="l01755"></a><span class="lineno"> 1755</span> </div><div class="line"><a name="l01756"></a><span class="lineno"> 1756</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l01757"></a><span class="lineno"> 1757</span>  operator()(<span class="keyword">const</span> _Tp1& __lhs, <span class="keyword">const</span> _Tp& __rhs) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l01758"></a><span class="lineno"> 1758</span>  { <span class="keywordflow">return</span> __lhs.owner_before(__rhs); }</div><div class="line"><a name="l01759"></a><span class="lineno"> 1759</span>  };</div><div class="line"><a name="l01760"></a><span class="lineno"> 1760</span> </div><div class="line"><a name="l01761"></a><span class="lineno"> 1761</span>  <span class="keyword">template</span><></div><div class="line"><a name="l01762"></a><span class="lineno"> 1762</span>  <span class="keyword">struct </span>_Sp_owner_less<void, void></div><div class="line"><a name="l01763"></a><span class="lineno"> 1763</span>  {</div><div class="line"><a name="l01764"></a><span class="lineno"> 1764</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Up></div><div class="line"><a name="l01765"></a><span class="lineno"> 1765</span>  <span class="keyword">auto</span></div><div class="line"><a name="l01766"></a><span class="lineno"> 1766</span>  operator()(<span class="keyword">const</span> _Tp& __lhs, <span class="keyword">const</span> _Up& __rhs) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l01767"></a><span class="lineno"> 1767</span>  -> decltype(__lhs.owner_before(__rhs))</div><div class="line"><a name="l01768"></a><span class="lineno"> 1768</span>  { <span class="keywordflow">return</span> __lhs.owner_before(__rhs); }</div><div class="line"><a name="l01769"></a><span class="lineno"> 1769</span> </div><div class="line"><a name="l01770"></a><span class="lineno"> 1770</span>  <span class="keyword">using</span> is_transparent = void;</div><div class="line"><a name="l01771"></a><span class="lineno"> 1771</span>  };</div><div class="line"><a name="l01772"></a><span class="lineno"> 1772</span> </div><div class="line"><a name="l01773"></a><span class="lineno"> 1773</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01774"></a><span class="lineno"> 1774</span>  <span class="keyword">struct </span>owner_less<__shared_ptr<_Tp, _Lp>></div><div class="line"><a name="l01775"></a><span class="lineno"> 1775</span>  : <span class="keyword">public</span> _Sp_owner_less<__shared_ptr<_Tp, _Lp>, __weak_ptr<_Tp, _Lp>></div><div class="line"><a name="l01776"></a><span class="lineno"> 1776</span>  { };</div><div class="line"><a name="l01777"></a><span class="lineno"> 1777</span> </div><div class="line"><a name="l01778"></a><span class="lineno"> 1778</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01779"></a><span class="lineno"> 1779</span>  <span class="keyword">struct </span>owner_less<__weak_ptr<_Tp, _Lp>></div><div class="line"><a name="l01780"></a><span class="lineno"> 1780</span>  : <span class="keyword">public</span> _Sp_owner_less<__weak_ptr<_Tp, _Lp>, __shared_ptr<_Tp, _Lp>></div><div class="line"><a name="l01781"></a><span class="lineno"> 1781</span>  { };</div><div class="line"><a name="l01782"></a><span class="lineno"> 1782</span> </div><div class="line"><a name="l01783"></a><span class="lineno"> 1783</span> </div><div class="line"><a name="l01784"></a><span class="lineno"> 1784</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01785"></a><span class="lineno"> 1785</span>  <span class="keyword">class </span>__enable_shared_from_this</div><div class="line"><a name="l01786"></a><span class="lineno"> 1786</span>  {</div><div class="line"><a name="l01787"></a><span class="lineno"> 1787</span>  <span class="keyword">protected</span>:</div><div class="line"><a name="l01788"></a><span class="lineno"> 1788</span>  constexpr __enable_shared_from_this() noexcept { }</div><div class="line"><a name="l01789"></a><span class="lineno"> 1789</span> </div><div class="line"><a name="l01790"></a><span class="lineno"> 1790</span>  __enable_shared_from_this(<span class="keyword">const</span> __enable_shared_from_this&) noexcept { }</div><div class="line"><a name="l01791"></a><span class="lineno"> 1791</span> </div><div class="line"><a name="l01792"></a><span class="lineno"> 1792</span>  __enable_shared_from_this&</div><div class="line"><a name="l01793"></a><span class="lineno"> 1793</span>  operator=(<span class="keyword">const</span> __enable_shared_from_this&) noexcept</div><div class="line"><a name="l01794"></a><span class="lineno"> 1794</span>  { <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l01795"></a><span class="lineno"> 1795</span> </div><div class="line"><a name="l01796"></a><span class="lineno"> 1796</span>  ~__enable_shared_from_this() { }</div><div class="line"><a name="l01797"></a><span class="lineno"> 1797</span> </div><div class="line"><a name="l01798"></a><span class="lineno"> 1798</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l01799"></a><span class="lineno"> 1799</span>  __shared_ptr<_Tp, _Lp></div><div class="line"><a name="l01800"></a><span class="lineno"> 1800</span>  shared_from_this()</div><div class="line"><a name="l01801"></a><span class="lineno"> 1801</span>  { <span class="keywordflow">return</span> __shared_ptr<_Tp, _Lp>(this->_M_weak_this); }</div><div class="line"><a name="l01802"></a><span class="lineno"> 1802</span> </div><div class="line"><a name="l01803"></a><span class="lineno"> 1803</span>  __shared_ptr<const _Tp, _Lp></div><div class="line"><a name="l01804"></a><span class="lineno"> 1804</span>  shared_from_this()<span class="keyword"> const</span></div><div class="line"><a name="l01805"></a><span class="lineno"> 1805</span> <span class="keyword"> </span>{ <span class="keywordflow">return</span> __shared_ptr<const _Tp, _Lp>(this->_M_weak_this); }</div><div class="line"><a name="l01806"></a><span class="lineno"> 1806</span> </div><div class="line"><a name="l01807"></a><span class="lineno"> 1807</span> <span class="preprocessor">#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11</span></div><div class="line"><a name="l01808"></a><span class="lineno"> 1808</span>  __weak_ptr<_Tp, _Lp></div><div class="line"><a name="l01809"></a><span class="lineno"> 1809</span>  weak_from_this() noexcept</div><div class="line"><a name="l01810"></a><span class="lineno"> 1810</span>  { <span class="keywordflow">return</span> this->_M_weak_this; }</div><div class="line"><a name="l01811"></a><span class="lineno"> 1811</span> </div><div class="line"><a name="l01812"></a><span class="lineno"> 1812</span>  __weak_ptr<const _Tp, _Lp></div><div class="line"><a name="l01813"></a><span class="lineno"> 1813</span>  weak_from_this() const noexcept</div><div class="line"><a name="l01814"></a><span class="lineno"> 1814</span>  { <span class="keywordflow">return</span> this->_M_weak_this; }</div><div class="line"><a name="l01815"></a><span class="lineno"> 1815</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l01816"></a><span class="lineno"> 1816</span> </div><div class="line"><a name="l01817"></a><span class="lineno"> 1817</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l01818"></a><span class="lineno"> 1818</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1></div><div class="line"><a name="l01819"></a><span class="lineno"> 1819</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l01820"></a><span class="lineno"> 1820</span>  _M_weak_assign(_Tp1* __p, <span class="keyword">const</span> __shared_count<_Lp>& __n) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l01821"></a><span class="lineno"> 1821</span>  { _M_weak_this._M_assign(__p, __n); }</div><div class="line"><a name="l01822"></a><span class="lineno"> 1822</span> </div><div class="line"><a name="l01823"></a><span class="lineno"> 1823</span>  <span class="keyword">friend</span> <span class="keyword">const</span> __enable_shared_from_this*</div><div class="line"><a name="l01824"></a><span class="lineno"> 1824</span>  __enable_shared_from_this_base(<span class="keyword">const</span> __shared_count<_Lp>&,</div><div class="line"><a name="l01825"></a><span class="lineno"> 1825</span>  <span class="keyword">const</span> __enable_shared_from_this* __p)</div><div class="line"><a name="l01826"></a><span class="lineno"> 1826</span>  { <span class="keywordflow">return</span> __p; }</div><div class="line"><a name="l01827"></a><span class="lineno"> 1827</span> </div><div class="line"><a name="l01828"></a><span class="lineno"> 1828</span>  <span class="keyword">template</span><<span class="keyword">typename</span>, _Lock_policy></div><div class="line"><a name="l01829"></a><span class="lineno"> 1829</span>  <span class="keyword">friend</span> <span class="keyword">class </span>__shared_ptr;</div><div class="line"><a name="l01830"></a><span class="lineno"> 1830</span> </div><div class="line"><a name="l01831"></a><span class="lineno"> 1831</span>  <span class="keyword">mutable</span> __weak_ptr<_Tp, _Lp> _M_weak_this;</div><div class="line"><a name="l01832"></a><span class="lineno"> 1832</span>  };</div><div class="line"><a name="l01833"></a><span class="lineno"> 1833</span> </div><div class="line"><a name="l01834"></a><span class="lineno"> 1834</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp, <span class="keyword">typename</span> _Alloc, <span class="keyword">typename</span>... _Args></div><div class="line"><a name="l01835"></a><span class="lineno"> 1835</span>  <span class="keyword">inline</span> __shared_ptr<_Tp, _Lp></div><div class="line"><a name="l01836"></a><span class="lineno"> 1836</span>  __allocate_shared(<span class="keyword">const</span> _Alloc& __a, _Args&&... __args)</div><div class="line"><a name="l01837"></a><span class="lineno"> 1837</span>  {</div><div class="line"><a name="l01838"></a><span class="lineno"> 1838</span>  <span class="keywordflow">return</span> __shared_ptr<_Tp, _Lp>(_Sp_alloc_shared_tag<_Alloc>{__a},</div><div class="line"><a name="l01839"></a><span class="lineno"> 1839</span>  std::forward<_Args>(__args)...);</div><div class="line"><a name="l01840"></a><span class="lineno"> 1840</span>  }</div><div class="line"><a name="l01841"></a><span class="lineno"> 1841</span> </div><div class="line"><a name="l01842"></a><span class="lineno"> 1842</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp, <span class="keyword">typename</span>... _Args></div><div class="line"><a name="l01843"></a><span class="lineno"> 1843</span>  <span class="keyword">inline</span> __shared_ptr<_Tp, _Lp></div><div class="line"><a name="l01844"></a><span class="lineno"> 1844</span>  __make_shared(_Args&&... __args)</div><div class="line"><a name="l01845"></a><span class="lineno"> 1845</span>  {</div><div class="line"><a name="l01846"></a><span class="lineno"> 1846</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::remove_const<_Tp>::type _Tp_nc;</div><div class="line"><a name="l01847"></a><span class="lineno"> 1847</span>  <span class="keywordflow">return</span> std::__allocate_shared<_Tp, _Lp>(<a class="code" href="a04704.html">std::allocator<_Tp_nc></a>(),</div><div class="line"><a name="l01848"></a><span class="lineno"> 1848</span>  std::forward<_Args>(__args)...);</div><div class="line"><a name="l01849"></a><span class="lineno"> 1849</span>  }</div><div class="line"><a name="l01850"></a><span class="lineno"> 1850</span> <span class="comment"></span></div><div class="line"><a name="l01851"></a><span class="lineno"> 1851</span> <span class="comment"> /// std::hash specialization for __shared_ptr.</span></div><div class="line"><a name="l01852"></a><span class="lineno"> 1852</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l01853"></a><span class="lineno"><a class="line" href="a07072.html"> 1853</a></span>  <span class="keyword">struct </span><a class="code" href="a02836.html">hash</a><__shared_ptr<_Tp, _Lp>></div><div class="line"><a name="l01854"></a><span class="lineno"> 1854</span>  : <span class="keyword">public</span> __hash_base<size_t, __shared_ptr<_Tp, _Lp>></div><div class="line"><a name="l01855"></a><span class="lineno"> 1855</span>  {</div><div class="line"><a name="l01856"></a><span class="lineno"> 1856</span>  <span class="keywordtype">size_t</span></div><div class="line"><a name="l01857"></a><span class="lineno"> 1857</span>  operator()(<span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __s) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l01858"></a><span class="lineno"> 1858</span>  {</div><div class="line"><a name="l01859"></a><span class="lineno"> 1859</span>  <span class="keywordflow">return</span> <a class="code" href="a02836.html">hash<typename __shared_ptr<_Tp, _Lp>::element_type</a>*>()(</div><div class="line"><a name="l01860"></a><span class="lineno"> 1860</span>  __s.get());</div><div class="line"><a name="l01861"></a><span class="lineno"> 1861</span>  }</div><div class="line"><a name="l01862"></a><span class="lineno"> 1862</span>  };</div><div class="line"><a name="l01863"></a><span class="lineno"> 1863</span> </div><div class="line"><a name="l01864"></a><span class="lineno"> 1864</span> _GLIBCXX_END_NAMESPACE_VERSION</div><div class="line"><a name="l01865"></a><span class="lineno"> 1865</span> } <span class="comment">// namespace</span></div><div class="line"><a name="l01866"></a><span class="lineno"> 1866</span> </div><div class="line"><a name="l01867"></a><span class="lineno"> 1867</span> <span class="preprocessor">#endif // _SHARED_PTR_BASE_H</span></div><div class="ttc" id="a06888_html"><div class="ttname"><a href="a06888.html">std::bad_weak_ptr</a></div><div class="ttdoc">Exception possibly thrown by shared_ptr.</div><div class="ttdef"><b>Definition:</b> <a href="a00506_source.html#l00073">shared_ptr_base.h:73</a></div></div>
<div class="ttc" id="a01016_html"><div class="ttname"><a href="a01016.html">aligned_buffer.h</a></div></div>
<div class="ttc" id="a04704_html"><div class="ttname"><a href="a04704.html">std::allocator</a></div><div class="ttdoc">The standard allocator, as per [20.4].</div><div class="ttdef"><b>Definition:</b> <a href="a00272_source.html#l00108">allocator.h:108</a></div></div>
<div class="ttc" id="a06888_html_adfea1fffacfb8c9c39f374e16ec7315c"><div class="ttname"><a href="a06888.html#adfea1fffacfb8c9c39f374e16ec7315c">std::bad_weak_ptr::what</a></div><div class="ttdeci">virtual char const * what() const noexcept</div></div>
<div class="ttc" id="a01538_html_a82fa606b1427f731ac64bb8ac49221f3"><div class="ttname"><a href="a01538.html#a82fa606b1427f731ac64bb8ac49221f3">std::lock</a></div><div class="ttdeci">void lock(_L1 &__l1, _L2 &__l2, _L3 &... __l3)</div><div class="ttdoc">Generic lock.</div><div class="ttdef"><b>Definition:</b> <a href="a00110_source.html#l00542">mutex:542</a></div></div>
<div class="ttc" id="a00542_html"><div class="ttname"><a href="a00542.html">stl_function.h</a></div></div>
<div class="ttc" id="a02836_html"><div class="ttname"><a href="a02836.html">std::hash</a></div><div class="ttdoc">Primary class template hash.</div><div class="ttdef"><b>Definition:</b> <a href="a00155_source.html#l00142">system_error:142</a></div></div>
<div class="ttc" id="a01476_html_gaebe6729ab5488ecc76c762873d226857"><div class="ttname"><a href="a01476.html#gaebe6729ab5488ecc76c762873d226857">std::false_type</a></div><div class="ttdeci">integral_constant< bool, false > false_type</div><div class="ttdoc">The type used as a compile-time boolean with false value.</div><div class="ttdef"><b>Definition:</b> <a href="a00167_source.html#l00078">type_traits:78</a></div></div>
<div class="ttc" id="a00035_html"><div class="ttname"><a href="a00035.html">typeinfo</a></div></div>
<div class="ttc" id="a01668_html"><div class="ttname"><a href="a01668.html">std::type_info</a></div><div class="ttdoc">Part of RTTI.</div><div class="ttdef"><b>Definition:</b> <a href="a00035_source.html#l00088">typeinfo:88</a></div></div>
<div class="ttc" id="a04636_html_ac73f3d164cf01c9d61b44d42c30db3d3"><div class="ttname"><a href="a04636.html#ac73f3d164cf01c9d61b44d42c30db3d3">std::allocator_traits::destroy</a></div><div class="ttdeci">static void destroy(_Alloc &__a, _Tp *__p)</div><div class="ttdoc">Destroy an object of type _Tp.</div><div class="ttdef"><b>Definition:</b> <a href="a16473_source.html#l00355">bits/alloc_traits.h:355</a></div></div>
<div class="ttc" id="a01477_html_ga1954d5552e24586051011312041033f6"><div class="ttname"><a href="a01477.html#ga1954d5552e24586051011312041033f6">std::__addressof</a></div><div class="ttdeci">constexpr _Tp * __addressof(_Tp &__r) noexcept</div><div class="ttdoc">Same as C++11 std::addressof.</div><div class="ttdef"><b>Definition:</b> <a href="a00422_source.html#l00047">move.h:47</a></div></div>
<div class="ttc" id="a01477_html_gacb5baec338e12b99cb6bddea7506c7c6"><div class="ttname"><a href="a01477.html#gacb5baec338e12b99cb6bddea7506c7c6">std::forward</a></div><div class="ttdeci">constexpr _Tp && forward(typename std::remove_reference< _Tp >::type &__t) noexcept</div><div class="ttdoc">Forward an lvalue.</div><div class="ttdef"><b>Definition:</b> <a href="a00422_source.html#l00074">move.h:74</a></div></div>
<div class="ttc" id="a00461_html"><div class="ttname"><a href="a00461.html">refwrap.h</a></div></div>
<div class="ttc" id="a01538_html_a1fa3f7679aec1619e37fddf24eb70a11"><div class="ttname"><a href="a01538.html#a1fa3f7679aec1619e37fddf24eb70a11">std::__allocate_guarded</a></div><div class="ttdeci">__allocated_ptr< _Alloc > __allocate_guarded(_Alloc &__a)</div><div class="ttdoc">Allocate space for a single object using __a.</div><div class="ttdef"><b>Definition:</b> <a href="a00269_source.html#l00095">allocated_ptr.h:95</a></div></div>
<div class="ttc" id="a08452_html"><div class="ttname"><a href="a08452.html">std::auto_ptr</a></div><div class="ttdoc">A simple smart pointer providing strict ownership semantics.</div><div class="ttdef"><b>Definition:</b> <a href="a00719_source.html#l00089">auto_ptr.h:89</a></div></div>
<div class="ttc" id="a10280_html"><div class="ttname"><a href="a10280.html">__gnu_cxx::__scoped_lock</a></div><div class="ttdoc">Scoped lock idiom.</div><div class="ttdef"><b>Definition:</b> <a href="a01034_source.html#l00231">concurrence.h:231</a></div></div>
<div class="ttc" id="a01476_html_ga6a860513044e23d34e553ea986e83fa1"><div class="ttname"><a href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">std::true_type</a></div><div class="ttdeci">integral_constant< bool, true > true_type</div><div class="ttdoc">The type used as a compile-time boolean with true value.</div><div class="ttdef"><b>Definition:</b> <a href="a00167_source.html#l00075">type_traits:75</a></div></div>
<div class="ttc" id="a01538_html"><div class="ttname"><a href="a01538.html">std</a></div><div class="ttdoc">ISO C++ entities toplevel namespace is std.</div></div>
<div class="ttc" id="a00269_html"><div class="ttname"><a href="a00269.html">allocated_ptr.h</a></div></div>
<div class="ttc" id="a04636_html_aad7d7b8604439d1ecf953a1b9a426e7b"><div class="ttname"><a href="a04636.html#aad7d7b8604439d1ecf953a1b9a426e7b">std::allocator_traits::construct</a></div><div class="ttdeci">static auto construct(_Alloc &__a, _Tp *__p, _Args &&... __args) -> decltype(_S_construct(__a, __p, std::forward< _Args >(__args)...))</div><div class="ttdoc">Construct an object of type _Tp.</div><div class="ttdef"><b>Definition:</b> <a href="a16473_source.html#l00342">bits/alloc_traits.h:342</a></div></div>
<div class="ttc" id="a05424_html"><div class="ttname"><a href="a05424.html">std::exception</a></div><div class="ttdoc">Base class for all library exceptions.</div><div class="ttdef"><b>Definition:</b> <a href="a00326_source.html#l00060">exception.h:60</a></div></div>
<div class="ttc" id="a07376_html"><div class="ttname"><a href="a07376.html">std::less</a></div><div class="ttdoc">One of the comparison functors.</div><div class="ttdef"><b>Definition:</b> <a href="a00542_source.html#l00340">stl_function.h:340</a></div></div>
<div class="ttc" id="a01467_html_gaf84b7343bdda8ed9615cd8f5a61c5e83"><div class="ttname"><a href="a01467.html#gaf84b7343bdda8ed9615cd8f5a61c5e83">std::operator*</a></div><div class="ttdeci">complex< _Tp > operator*(const complex< _Tp > &__x, const complex< _Tp > &__y)</div><div class="ttdoc">Return new complex value x times y.</div><div class="ttdef"><b>Definition:</b> <a href="a00053_source.html#l00386">complex:386</a></div></div>
<div class="ttc" id="a07964_html"><div class="ttname"><a href="a07964.html">std::unique_ptr</a></div><div class="ttdoc">20.7.1.2 unique_ptr for single objects.</div><div class="ttdef"><b>Definition:</b> <a href="a00620_source.html#l00160">unique_ptr.h:160</a></div></div>
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