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<a href="a17112.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 -*- 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</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_H</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor">#define _SHARED_PTR_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="a00506.html">bits/shared_ptr_base.h</a>></span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="keyword">namespace </span><a class="code" href="a01541.html">std</a> _GLIBCXX_VISIBILITY(default)</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> {</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"></span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> /**</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> * @addtogroup pointer_abstractions</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> * @{</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> */</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"></span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> /// 20.7.2.2.11 shared_ptr I/O</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Ch, <span class="keyword">typename</span> _Tr, <span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">inline</span> <a class="code" href="a02463.html">std::basic_ostream<_Ch, _Tr></a>&</div><div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="a01475.html#ga8f7159a55b4df5308fa03b531586fb2b"> 66</a></span>  <a class="code" href="a01541.html#a20aaa750b7ddf43635768c7b2d0385e6">operator<<</a>(<a class="code" href="a02463.html">std::basic_ostream<_Ch, _Tr></a>& __os,</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __p)</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  {</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  __os << __p.get();</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">return</span> __os;</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  }</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Del, <span class="keyword">typename</span> _Tp, _Lock_policy _Lp></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keyword">inline</span> _Del*</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  get_deleter(<span class="keyword">const</span> __shared_ptr<_Tp, _Lp>& __p) noexcept</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  {</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="preprocessor">#if __cpp_rtti</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">return</span> static_cast<_Del*>(__p._M_get_deleter(<span class="keyword">typeid</span>(_Del)));</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  }</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"></span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> /// 20.7.2.2.10 shared_ptr get_deleter</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Del, <span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keyword">inline</span> _Del*</div><div class="line"><a name="l00087"></a><span class="lineno"><a class="line" href="a01475.html#gacb5354a4d89bb5629e96165ead8f62c7"> 87</a></span>  get_deleter(<span class="keyword">const</span> <a class="code" href="a06851.html">shared_ptr<_Tp></a>& __p) noexcept</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  {</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="preprocessor">#if __cpp_rtti</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">return</span> static_cast<_Del*>(__p._M_get_deleter(<span class="keyword">typeid</span>(_Del)));</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  }</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"></span></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"> /**</span></div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> * @brief A smart pointer with reference-counted copy semantics.</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"> *</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> * The object pointed to is deleted when the last shared_ptr pointing to</span></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> * it is destroyed or reset.</span></div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> */</span></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00103"></a><span class="lineno"><a class="line" href="a06851.html"> 103</a></span>  <span class="keyword">class </span><a class="code" href="a06851.html">shared_ptr</a> : <span class="keyword">public</span> __shared_ptr<_Tp></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">template</span><<span class="keyword">typename</span>... _Args></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keyword">using</span> _Constructible = <span class="keyword">typename</span> <a class="code" href="a04191.html">enable_if</a><</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <a class="code" href="a03575.html">is_constructible<__shared_ptr<_Tp></a>, _Args...>::value</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  >::type;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Arg></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keyword">using</span> _Assignable = <span class="keyword">typename</span> <a class="code" href="a04191.html">enable_if</a><</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <a class="code" href="a03683.html">is_assignable<__shared_ptr<_Tp></a>&, _Arg>::value, <a class="code" href="a06851.html">shared_ptr</a>&</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  >::type;</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span> </div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keyword">using</span> element_type = <span class="keyword">typename</span> __shared_ptr<_Tp>::element_type;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="preprocessor">#if __cplusplus > 201402L</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="preprocessor"># define __cpp_lib_shared_ptr_weak_type 201606</span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keyword">using</span> weak_type = <a class="code" href="a06859.html">weak_ptr<_Tp></a>;</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> /**</span></div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"> * @brief Construct an empty %shared_ptr.</span></div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment"> * @post use_count()==0 && get()==0</span></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment"> */</span></div><div class="line"><a name="l00127"></a><span class="lineno"><a class="line" href="a06851.html#a4497f1d5421073bd8c1ee305414c4e80"> 127</a></span>  constexpr <a class="code" href="a06851.html#a4497f1d5421073bd8c1ee305414c4e80">shared_ptr</a>() noexcept : __shared_ptr<_Tp>() { }</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>  <a class="code" href="a06851.html#a4497f1d5421073bd8c1ee305414c4e80">shared_ptr</a>(<span class="keyword">const</span> <a class="code" href="a06851.html">shared_ptr</a>&) noexcept = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"></span></div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment"> /**</span></div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> * @brief Construct a %shared_ptr that owns the pointer @a __p.</span></div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"> * @param __p A pointer that is convertible to element_type*.</span></div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> * @post use_count() == 1 && get() == __p</span></div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"> * @throw std::bad_alloc, in which case @c delete @a __p is called.</span></div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment"> */</span></div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _Constructible<_Yp*>></div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keyword">explicit</span></div><div class="line"><a name="l00139"></a><span class="lineno"><a class="line" href="a06851.html#a7752bdf2d4dc3f4f5719fd05f2d92089"> 139</a></span>  <a class="code" href="a06851.html#a7752bdf2d4dc3f4f5719fd05f2d92089">shared_ptr</a>(_Yp* __p) : __shared_ptr<_Tp>(__p) { }</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment"></span></div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment"> /**</span></div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment"> * @brief Construct a %shared_ptr that owns the pointer @a __p</span></div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"> * and the deleter @a __d.</span></div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment"> * @param __p A pointer.</span></div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment"> * @param __d A deleter.</span></div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment"> * @post use_count() == 1 && get() == __p</span></div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment"> * @throw std::bad_alloc, in which case @a __d(__p) is called.</span></div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment"> *</span></div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="comment"> * Requirements: _Deleter's copy constructor and destructor must</span></div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment"> * not throw</span></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment"> *</span></div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> * __shared_ptr will release __p by calling __d(__p)</span></div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="comment"> */</span></div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Deleter,</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keyword">typename</span> = _Constructible<_Yp*, _Deleter>></div><div class="line"><a name="l00156"></a><span class="lineno"><a class="line" href="a06851.html#a8b115d3d42304820c9942ddeb58644ee"> 156</a></span>  <a class="code" href="a06851.html#a8b115d3d42304820c9942ddeb58644ee">shared_ptr</a>(_Yp* __p, _Deleter __d)</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  : __shared_ptr<_Tp>(__p, <a class="code" href="a01541.html">std</a>::move(__d)) { }</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="comment"></span></div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="comment"> /**</span></div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="comment"> * @brief Construct a %shared_ptr that owns a null pointer</span></div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="comment"> * and the deleter @a __d.</span></div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="comment"> * @param __p A null pointer constant.</span></div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment"> * @param __d A deleter.</span></div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="comment"> * @post use_count() == 1 && get() == __p</span></div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span> <span class="comment"> * @throw std::bad_alloc, in which case @a __d(__p) is called.</span></div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="comment"> *</span></div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="comment"> * Requirements: _Deleter's copy constructor and destructor must</span></div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="comment"> * not throw</span></div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="comment"> *</span></div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="comment"> * The last owner will call __d(__p)</span></div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="comment"> */</span></div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Deleter></div><div class="line"><a name="l00173"></a><span class="lineno"><a class="line" href="a06851.html#a893642e27fcab50317ba7d91392c0871"> 173</a></span>  <a class="code" href="a06851.html#a893642e27fcab50317ba7d91392c0871">shared_ptr</a>(nullptr_t __p, _Deleter __d)</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  : __shared_ptr<_Tp>(__p, <a class="code" href="a01541.html">std</a>::move(__d)) { }</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span> <span class="comment"></span></div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="comment"> /**</span></div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment"> * @brief Construct a %shared_ptr that owns the pointer @a __p</span></div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment"> * and the deleter @a __d.</span></div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="comment"> * @param __p A pointer.</span></div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="comment"> * @param __d A deleter.</span></div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="comment"> * @param __a An allocator.</span></div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="comment"> * @post use_count() == 1 && get() == __p</span></div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span> <span class="comment"> * @throw std::bad_alloc, in which case @a __d(__p) is called.</span></div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="comment"> *</span></div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span> <span class="comment"> * Requirements: _Deleter's copy constructor and destructor must</span></div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span> <span class="comment"> * not throw _Alloc's copy constructor and destructor must not</span></div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="comment"> * throw.</span></div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="comment"> *</span></div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="comment"> * __shared_ptr will release __p by calling __d(__p)</span></div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="comment"> */</span></div><div class="line"><a name="l00191"></a><span class="lineno"> 191</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="l00192"></a><span class="lineno"> 192</span>  <span class="keyword">typename</span> = _Constructible<_Yp*, _Deleter, _Alloc>></div><div class="line"><a name="l00193"></a><span class="lineno"><a class="line" href="a06851.html#a2b1f604b01d6faf7ed627624968e76b8"> 193</a></span>  <a class="code" href="a06851.html#a2b1f604b01d6faf7ed627624968e76b8">shared_ptr</a>(_Yp* __p, _Deleter __d, _Alloc __a)</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  : __shared_ptr<_Tp>(__p, <a class="code" href="a01541.html">std</a>::move(__d), <a class="code" href="a01541.html">std</a>::move(__a)) { }</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="comment"></span></div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="comment"> /**</span></div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="comment"> * @brief Construct a %shared_ptr that owns a null pointer</span></div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="comment"> * and the deleter @a __d.</span></div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="comment"> * @param __p A null pointer constant.</span></div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span> <span class="comment"> * @param __d A deleter.</span></div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="comment"> * @param __a An allocator.</span></div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="comment"> * @post use_count() == 1 && get() == __p</span></div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="comment"> * @throw std::bad_alloc, in which case @a __d(__p) is called.</span></div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="comment"> *</span></div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> <span class="comment"> * Requirements: _Deleter's copy constructor and destructor must</span></div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="comment"> * not throw _Alloc's copy constructor and destructor must not</span></div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="comment"> * throw.</span></div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <span class="comment"> *</span></div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <span class="comment"> * The last owner will call __d(__p)</span></div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span> <span class="comment"> */</span></div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Deleter, <span class="keyword">typename</span> _Alloc></div><div class="line"><a name="l00212"></a><span class="lineno"><a class="line" href="a06851.html#a124c2b4fe2cd0d7651eefd22ead8f2ec"> 212</a></span>  <a class="code" href="a06851.html#a124c2b4fe2cd0d7651eefd22ead8f2ec">shared_ptr</a>(nullptr_t __p, _Deleter __d, _Alloc __a)</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  : __shared_ptr<_Tp>(__p, <a class="code" href="a01541.html">std</a>::move(__d), <a class="code" href="a01541.html">std</a>::move(__a)) { }</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span> </div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="comment">// Aliasing constructor</span></div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="comment"></span></div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span> <span class="comment"> /**</span></div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="comment"> * @brief Constructs a %shared_ptr instance that stores @a __p</span></div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="comment"> * and shares ownership with @a __r.</span></div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="comment"> * @param __r A %shared_ptr.</span></div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span> <span class="comment"> * @param __p A pointer that will remain valid while @a *__r is valid.</span></div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <span class="comment"> * @post get() == __p && use_count() == __r.use_count()</span></div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span> <span class="comment"> *</span></div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="comment"> * This can be used to construct a @c shared_ptr to a sub-object</span></div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="comment"> * of an object managed by an existing @c shared_ptr.</span></div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="comment"> *</span></div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="comment"> * @code</span></div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span> <span class="comment"> * shared_ptr< pair<int,int> > pii(new pair<int,int>());</span></div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="comment"> * shared_ptr<int> pi(pii, &pii->first);</span></div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="comment"> * assert(pii.use_count() == 2);</span></div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="comment"> * @endcode</span></div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="comment"> */</span></div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l00234"></a><span class="lineno"><a class="line" href="a06851.html#a9c6e4362646c04f78bbaf043f90eb835"> 234</a></span>  <a class="code" href="a06851.html#a9c6e4362646c04f78bbaf043f90eb835">shared_ptr</a>(<span class="keyword">const</span> <a class="code" href="a06851.html">shared_ptr<_Yp></a>& __r, element_type* __p) noexcept</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  : __shared_ptr<_Tp>(__r, __p) { }</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span> <span class="comment"></span></div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span> <span class="comment"> /**</span></div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span> <span class="comment"> * @brief If @a __r is empty, constructs an empty %shared_ptr;</span></div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="comment"> * otherwise construct a %shared_ptr that shares ownership</span></div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="comment"> * with @a __r.</span></div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span> <span class="comment"> * @param __r A %shared_ptr.</span></div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="comment"> * @post get() == __r.get() && use_count() == __r.use_count()</span></div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span> <span class="comment"> */</span></div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp,</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keyword">typename</span> = _Constructible<const shared_ptr<_Yp>&>></div><div class="line"><a name="l00246"></a><span class="lineno"><a class="line" href="a06851.html#a1dad8483fa6f0d7507549bb8200c4de9"> 246</a></span>  <a class="code" href="a06851.html#a1dad8483fa6f0d7507549bb8200c4de9">shared_ptr</a>(<span class="keyword">const</span> <a class="code" href="a06851.html">shared_ptr<_Yp></a>& __r) noexcept</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  : __shared_ptr<_Tp>(__r) { }</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span> <span class="comment"></span></div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span> <span class="comment"> /**</span></div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span> <span class="comment"> * @brief Move-constructs a %shared_ptr instance from @a __r.</span></div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span> <span class="comment"> * @param __r A %shared_ptr rvalue.</span></div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span> <span class="comment"> * @post *this contains the old value of @a __r, @a __r is empty.</span></div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="comment"> */</span></div><div class="line"><a name="l00254"></a><span class="lineno"><a class="line" href="a06851.html#a5bd9976c3d66cf2a62904ebaeeab76e6"> 254</a></span>  <a class="code" href="a06851.html#a5bd9976c3d66cf2a62904ebaeeab76e6">shared_ptr</a>(<a class="code" href="a06851.html">shared_ptr</a>&& __r) noexcept</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  : __shared_ptr<_Tp>(std::move(__r)) { }</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span> <span class="comment"></span></div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span> <span class="comment"> /**</span></div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span> <span class="comment"> * @brief Move-constructs a %shared_ptr instance from @a __r.</span></div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span> <span class="comment"> * @param __r A %shared_ptr rvalue.</span></div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span> <span class="comment"> * @post *this contains the old value of @a __r, @a __r is empty.</span></div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span> <span class="comment"> */</span></div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _Constructible<shared_ptr<_Yp>>></div><div class="line"><a name="l00263"></a><span class="lineno"><a class="line" href="a06851.html#a21c103ae1494cc05477bd22ec5c284fc"> 263</a></span>  <a class="code" href="a06851.html#a21c103ae1494cc05477bd22ec5c284fc">shared_ptr</a>(<a class="code" href="a06851.html">shared_ptr<_Yp></a>&& __r) noexcept</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  : __shared_ptr<_Tp>(std::move(__r)) { }</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span> <span class="comment"></span></div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span> <span class="comment"> /**</span></div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span> <span class="comment"> * @brief Constructs a %shared_ptr that shares ownership with @a __r</span></div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span> <span class="comment"> * and stores a copy of the pointer stored in @a __r.</span></div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span> <span class="comment"> * @param __r A weak_ptr.</span></div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span> <span class="comment"> * @post use_count() == __r.use_count()</span></div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span> <span class="comment"> * @throw bad_weak_ptr when __r.expired(),</span></div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span> <span class="comment"> * in which case the constructor has no effect.</span></div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span> <span class="comment"> */</span></div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _Constructible<const weak_ptr<_Yp>&>></div><div class="line"><a name="l00275"></a><span class="lineno"><a class="line" href="a06851.html#aaab9ea5e4dc2ab2b17b5a25cd1b58cf3"> 275</a></span>  <span class="keyword">explicit</span> <a class="code" href="a06851.html#aaab9ea5e4dc2ab2b17b5a25cd1b58cf3">shared_ptr</a>(<span class="keyword">const</span> <a class="code" href="a06859.html">weak_ptr<_Yp></a>& __r)</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  : __shared_ptr<_Tp>(__r) { }</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="preprocessor">#if _GLIBCXX_USE_DEPRECATED</span></div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span> <span class="preprocessor">#pragma GCC diagnostic push</span></div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span> <span class="preprocessor">#pragma GCC diagnostic ignored "-Wdeprecated-declarations"</span></div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _Constructible<auto_ptr<_Yp>>></div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <a class="code" href="a06851.html#a4497f1d5421073bd8c1ee305414c4e80">shared_ptr</a>(<a class="code" href="a08455.html">auto_ptr<_Yp></a>&& __r);</div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span> <span class="preprocessor">#pragma GCC diagnostic pop</span></div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span> <span class="preprocessor">#endif</span></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">// _GLIBCXX_RESOLVE_LIB_DEFECTS</span></div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="comment">// 2399. shared_ptr's constructor from unique_ptr should be constrained</span></div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Del,</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  <span class="keyword">typename</span> = _Constructible<unique_ptr<_Yp, _Del>>></div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  <a class="code" href="a06851.html#a4497f1d5421073bd8c1ee305414c4e80">shared_ptr</a>(<a class="code" href="a07967.html">unique_ptr<_Yp, _Del></a>&& __r)</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  : __shared_ptr<_Tp>(<a class="code" href="a01541.html">std</a>::move(__r)) { }</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span> </div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span> <span class="preprocessor">#if __cplusplus <= 201402L && _GLIBCXX_USE_DEPRECATED</span></div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  <span class="comment">// This non-standard constructor exists to support conversions that</span></div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="comment">// were possible in C++11 and C++14 but are ill-formed in C++17.</span></div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="comment">// If an exception is thrown this constructor has no effect.</span></div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Del,</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  _Constructible<unique_ptr<_Yp, _Del>, __sp_array_delete>* = 0></div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  <a class="code" href="a06851.html#a4497f1d5421073bd8c1ee305414c4e80">shared_ptr</a>(unique_ptr<_Yp, _Del>&& __r)</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  : __shared_ptr<_Tp>(<a class="code" href="a01541.html">std</a>::move(__r), __sp_array_delete()) { }</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span> <span class="comment"></span></div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span> <span class="comment"> /**</span></div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span> <span class="comment"> * @brief Construct an empty %shared_ptr.</span></div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span> <span class="comment"> * @post use_count() == 0 && get() == nullptr</span></div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span> <span class="comment"> */</span></div><div class="line"><a name="l00307"></a><span class="lineno"><a class="line" href="a06851.html#ac924c816f979c01f5adc42407b2fac83"> 307</a></span>  constexpr <a class="code" href="a06851.html#ac924c816f979c01f5adc42407b2fac83">shared_ptr</a>(nullptr_t) noexcept : <a class="code" href="a06851.html#ac924c816f979c01f5adc42407b2fac83">shared_ptr</a>() { }</div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span> </div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  <a class="code" href="a06851.html">shared_ptr</a>& operator=(<span class="keyword">const</span> <a class="code" href="a06851.html">shared_ptr</a>&) noexcept = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span> </div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  _Assignable<const shared_ptr<_Yp>&></div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  operator=(<span class="keyword">const</span> <a class="code" href="a06851.html">shared_ptr<_Yp></a>& __r) noexcept</div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  {</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  this->__shared_ptr<_Tp>::operator=(__r);</div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  <span class="keywordflow">return</span> *<span class="keyword">this</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> </div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span> <span class="preprocessor">#if _GLIBCXX_USE_DEPRECATED</span></div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span> <span class="preprocessor">#pragma GCC diagnostic push</span></div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span> <span class="preprocessor">#pragma GCC diagnostic ignored "-Wdeprecated-declarations"</span></div><div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  _Assignable<auto_ptr<_Yp>></div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  operator=(auto_ptr<_Yp>&& __r)</div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  {</div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  this->__shared_ptr<_Tp>::operator=(std::move(__r));</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  }</div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span> <span class="preprocessor">#pragma GCC diagnostic pop</span></div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span> </div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  <a class="code" href="a06851.html#a4497f1d5421073bd8c1ee305414c4e80">shared_ptr</a>&</div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  operator=(<a class="code" href="a06851.html#a4497f1d5421073bd8c1ee305414c4e80">shared_ptr</a>&& __r) noexcept</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  {</div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  this->__shared_ptr<_Tp>::operator=(std::move(__r));</div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  }</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span> </div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Yp></div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  _Assignable<shared_ptr<_Yp>></div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  operator=(shared_ptr<_Yp>&& __r) noexcept</div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  {</div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  this->__shared_ptr<_Tp>::operator=(std::move(__r));</div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  }</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> _Yp, <span class="keyword">typename</span> _Del></div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  _Assignable<unique_ptr<_Yp, _Del>></div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  operator=(unique_ptr<_Yp, _Del>&& __r)</div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  {</div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  this->__shared_ptr<_Tp>::operator=(std::move(__r));</div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  }</div><div class="line"><a name="l00354"></a><span class="lineno"> 354</span> </div><div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  <span class="comment">// This constructor is non-standard, it is used by allocate_shared.</span></div><div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Alloc, <span class="keyword">typename</span>... _Args></div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  <a class="code" href="a06851.html#a4497f1d5421073bd8c1ee305414c4e80">shared_ptr</a>(_Sp_alloc_shared_tag<_Alloc> __tag, _Args&&... __args)</div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  : __shared_ptr<_Tp>(__tag, <a class="code" href="a01541.html">std</a>::<a class="code" href="a01480.html#gacb5baec338e12b99cb6bddea7506c7c6">forward</a><_Args>(__args)...)</div><div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  { }</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><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> _Alloc, <span class="keyword">typename</span>... _Args></div><div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  <span class="keyword">friend</span> shared_ptr<_Yp></div><div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  <a class="code" href="a06851.html#aae3d23f345adfb0284614b4d1bfdd7b3">allocate_shared</a>(<span class="keyword">const</span> _Alloc& __a, _Args&&... __args);</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">// This constructor is non-standard, it is used by weak_ptr::lock().</span></div><div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  <a class="code" href="a06851.html#a4497f1d5421073bd8c1ee305414c4e80">shared_ptr</a>(<span class="keyword">const</span> weak_ptr<_Tp>& __r, std::nothrow_t)</div><div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  : __shared_ptr<_Tp>(__r, <a class="code" href="a01541.html">std</a>::nothrow) { }</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">friend</span> <span class="keyword">class </span>weak_ptr<_Tp>;</div><div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  };</div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span> </div><div class="line"><a name="l00373"></a><span class="lineno"> 373</span> <span class="preprocessor">#if __cpp_deduction_guides >= 201606</span></div><div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  shared_ptr(weak_ptr<_Tp>) -> shared_ptr<_Tp>;</div><div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Del></div><div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  shared_ptr(unique_ptr<_Tp, _Del>) -> shared_ptr<_Tp>;</div><div class="line"><a name="l00378"></a><span class="lineno"> 378</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00379"></a><span class="lineno"> 379</span> </div><div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  <span class="comment">// 20.7.2.2.7 shared_ptr comparisons</span></div><div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Up></div><div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  operator==(<span class="keyword">const</span> shared_ptr<_Tp>& __a, <span class="keyword">const</span> shared_ptr<_Up>& __b) noexcept</div><div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  { <span class="keywordflow">return</span> __a.get() == __b.get(); }</div><div class="line"><a name="l00385"></a><span class="lineno"> 385</span> </div><div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  operator==(<span class="keyword">const</span> shared_ptr<_Tp>& __a, nullptr_t) noexcept</div><div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  { <span class="keywordflow">return</span> !__a; }</div><div class="line"><a name="l00390"></a><span class="lineno"> 390</span> </div><div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  operator==(nullptr_t, <span class="keyword">const</span> shared_ptr<_Tp>& __a) noexcept</div><div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  { <span class="keywordflow">return</span> !__a; }</div><div class="line"><a name="l00395"></a><span class="lineno"> 395</span> </div><div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Up></div><div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  operator!=(<span class="keyword">const</span> shared_ptr<_Tp>& __a, <span class="keyword">const</span> shared_ptr<_Up>& __b) noexcept</div><div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  { <span class="keywordflow">return</span> __a.get() != __b.get(); }</div><div class="line"><a name="l00400"></a><span class="lineno"> 400</span> </div><div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  operator!=(<span class="keyword">const</span> shared_ptr<_Tp>& __a, nullptr_t) noexcept</div><div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  { <span class="keywordflow">return</span> (<span class="keywordtype">bool</span>)__a; }</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="keyword">typename</span> _Tp></div><div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  operator!=(nullptr_t, <span class="keyword">const</span> shared_ptr<_Tp>& __a) noexcept</div><div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  { <span class="keywordflow">return</span> (<span class="keywordtype">bool</span>)__a; }</div><div class="line"><a name="l00410"></a><span class="lineno"> 410</span> </div><div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Up></div><div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  operator<(<span class="keyword">const</span> shared_ptr<_Tp>& __a, <span class="keyword">const</span> shared_ptr<_Up>& __b) noexcept</div><div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  {</div><div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  <span class="keyword">using</span> _Tp_elt = <span class="keyword">typename</span> shared_ptr<_Tp>::element_type;</div><div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  <span class="keyword">using</span> _Up_elt = <span class="keyword">typename</span> shared_ptr<_Up>::element_type;</div><div class="line"><a name="l00417"></a><span class="lineno"> 417</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="l00418"></a><span class="lineno"> 418</span>  <span class="keywordflow">return</span> less<_Vp>()(__a.get(), __b.get());</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> </div><div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  operator<(<span class="keyword">const</span> shared_ptr<_Tp>& __a, nullptr_t) noexcept</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">using</span> _Tp_elt = <span class="keyword">typename</span> shared_ptr<_Tp>::element_type;</div><div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  <span class="keywordflow">return</span> less<_Tp_elt*>()(__a.get(), <span class="keyword">nullptr</span>);</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> </div><div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  operator<(nullptr_t, <span class="keyword">const</span> shared_ptr<_Tp>& __a) noexcept</div><div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  {</div><div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  <span class="keyword">using</span> _Tp_elt = <span class="keyword">typename</span> shared_ptr<_Tp>::element_type;</div><div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  <span class="keywordflow">return</span> less<_Tp_elt*>()(<span class="keyword">nullptr</span>, __a.get());</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> </div><div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Up></div><div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  operator<=(<span class="keyword">const</span> shared_ptr<_Tp>& __a, <span class="keyword">const</span> shared_ptr<_Up>& __b) noexcept</div><div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  { <span class="keywordflow">return</span> !(__b < __a); }</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">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  operator<=(<span class="keyword">const</span> shared_ptr<_Tp>& __a, nullptr_t) noexcept</div><div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  { <span class="keywordflow">return</span> !(<span class="keyword">nullptr</span> < __a); }</div><div class="line"><a name="l00446"></a><span class="lineno"> 446</span> </div><div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  operator<=(nullptr_t, <span class="keyword">const</span> shared_ptr<_Tp>& __a) noexcept</div><div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  { <span class="keywordflow">return</span> !(__a < <span class="keyword">nullptr</span>); }</div><div class="line"><a name="l00451"></a><span class="lineno"> 451</span> </div><div class="line"><a name="l00452"></a><span class="lineno"> 452</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Up></div><div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00454"></a><span class="lineno"> 454</span>  operator>(<span class="keyword">const</span> shared_ptr<_Tp>& __a, <span class="keyword">const</span> shared_ptr<_Up>& __b) noexcept</div><div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  { <span class="keywordflow">return</span> (__b < __a); }</div><div class="line"><a name="l00456"></a><span class="lineno"> 456</span> </div><div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  operator>(<span class="keyword">const</span> shared_ptr<_Tp>& __a, nullptr_t) noexcept</div><div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  { <span class="keywordflow">return</span> <span class="keyword">nullptr</span> < __a; }</div><div class="line"><a name="l00461"></a><span class="lineno"> 461</span> </div><div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00463"></a><span class="lineno"> 463</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  operator>(nullptr_t, <span class="keyword">const</span> shared_ptr<_Tp>& __a) noexcept</div><div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  { <span class="keywordflow">return</span> __a < <span class="keyword">nullptr</span>; }</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>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Up></div><div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  operator>=(<span class="keyword">const</span> shared_ptr<_Tp>& __a, <span class="keyword">const</span> shared_ptr<_Up>& __b) noexcept</div><div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  { <span class="keywordflow">return</span> !(__a < __b); }</div><div class="line"><a name="l00471"></a><span class="lineno"> 471</span> </div><div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  operator>=(<span class="keyword">const</span> shared_ptr<_Tp>& __a, nullptr_t) noexcept</div><div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  { <span class="keywordflow">return</span> !(__a < <span class="keyword">nullptr</span>); }</div><div class="line"><a name="l00476"></a><span class="lineno"> 476</span> </div><div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00479"></a><span class="lineno"> 479</span>  operator>=(nullptr_t, <span class="keyword">const</span> shared_ptr<_Tp>& __a) noexcept</div><div class="line"><a name="l00480"></a><span class="lineno"> 480</span>  { <span class="keywordflow">return</span> !(<span class="keyword">nullptr</span> < __a); }</div><div class="line"><a name="l00481"></a><span class="lineno"> 481</span> </div><div class="line"><a name="l00482"></a><span class="lineno"> 482</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  <span class="keyword">struct </span>less<shared_ptr<_Tp>> : <span class="keyword">public</span> _Sp_less<shared_ptr<_Tp>></div><div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  { };</div><div class="line"><a name="l00485"></a><span class="lineno"> 485</span> </div><div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  <span class="comment">// 20.7.2.2.8 shared_ptr specialized algorithms.</span></div><div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  swap(shared_ptr<_Tp>& __a, shared_ptr<_Tp>& __b) noexcept</div><div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  { __a.swap(__b); }</div><div class="line"><a name="l00491"></a><span class="lineno"> 491</span> </div><div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  <span class="comment">// 20.7.2.2.9 shared_ptr casts.</span></div><div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Up></div><div class="line"><a name="l00494"></a><span class="lineno"> 494</span>  <span class="keyword">inline</span> shared_ptr<_Tp></div><div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  static_pointer_cast(<span class="keyword">const</span> shared_ptr<_Up>& __r) noexcept</div><div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  {</div><div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  <span class="keyword">using</span> _Sp = shared_ptr<_Tp>;</div><div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  <span class="keywordflow">return</span> _Sp(__r, static_cast<typename _Sp::element_type*>(__r.get()));</div><div class="line"><a name="l00499"></a><span class="lineno"> 499</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">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Up></div><div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  <span class="keyword">inline</span> shared_ptr<_Tp></div><div class="line"><a name="l00503"></a><span class="lineno"> 503</span>  const_pointer_cast(<span class="keyword">const</span> shared_ptr<_Up>& __r) noexcept</div><div class="line"><a name="l00504"></a><span class="lineno"> 504</span>  {</div><div class="line"><a name="l00505"></a><span class="lineno"> 505</span>  <span class="keyword">using</span> _Sp = shared_ptr<_Tp>;</div><div class="line"><a name="l00506"></a><span class="lineno"> 506</span>  <span class="keywordflow">return</span> _Sp(__r, const_cast<typename _Sp::element_type*>(__r.get()));</div><div class="line"><a name="l00507"></a><span class="lineno"> 507</span>  }</div><div class="line"><a name="l00508"></a><span class="lineno"> 508</span> </div><div class="line"><a name="l00509"></a><span class="lineno"> 509</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Up></div><div class="line"><a name="l00510"></a><span class="lineno"> 510</span>  <span class="keyword">inline</span> shared_ptr<_Tp></div><div class="line"><a name="l00511"></a><span class="lineno"> 511</span>  dynamic_pointer_cast(<span class="keyword">const</span> shared_ptr<_Up>& __r) noexcept</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>  <span class="keyword">using</span> _Sp = shared_ptr<_Tp>;</div><div class="line"><a name="l00514"></a><span class="lineno"> 514</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="l00515"></a><span class="lineno"> 515</span>  <span class="keywordflow">return</span> _Sp(__r, __p);</div><div class="line"><a name="l00516"></a><span class="lineno"> 516</span>  <span class="keywordflow">return</span> _Sp();</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> </div><div class="line"><a name="l00519"></a><span class="lineno"> 519</span> <span class="preprocessor">#if __cplusplus > 201402L</span></div><div class="line"><a name="l00520"></a><span class="lineno"> 520</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Up></div><div class="line"><a name="l00521"></a><span class="lineno"> 521</span>  <span class="keyword">inline</span> shared_ptr<_Tp></div><div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  reinterpret_pointer_cast(<span class="keyword">const</span> shared_ptr<_Up>& __r) noexcept</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">using</span> _Sp = shared_ptr<_Tp>;</div><div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  <span class="keywordflow">return</span> _Sp(__r, reinterpret_cast<typename _Sp::element_type*>(__r.get()));</div><div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  }</div><div class="line"><a name="l00527"></a><span class="lineno"> 527</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00528"></a><span class="lineno"> 528</span> <span class="comment"></span></div><div class="line"><a name="l00529"></a><span class="lineno"> 529</span> <span class="comment"> /**</span></div><div class="line"><a name="l00530"></a><span class="lineno"> 530</span> <span class="comment"> * @brief A smart pointer with weak semantics.</span></div><div class="line"><a name="l00531"></a><span class="lineno"> 531</span> <span class="comment"> *</span></div><div class="line"><a name="l00532"></a><span class="lineno"> 532</span> <span class="comment"> * With forwarding constructors and assignment operators.</span></div><div class="line"><a name="l00533"></a><span class="lineno"> 533</span> <span class="comment"> */</span></div><div class="line"><a name="l00534"></a><span class="lineno"> 534</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00535"></a><span class="lineno"><a class="line" href="a06859.html"> 535</a></span>  <span class="keyword">class </span><a class="code" href="a06859.html">weak_ptr</a> : <span class="keyword">public</span> __weak_ptr<_Tp></div><div class="line"><a name="l00536"></a><span class="lineno"> 536</span>  {</div><div class="line"><a name="l00537"></a><span class="lineno"> 537</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Arg></div><div class="line"><a name="l00538"></a><span class="lineno"> 538</span>  <span class="keyword">using</span> _Constructible = <span class="keyword">typename</span> <a class="code" href="a04191.html">enable_if</a><</div><div class="line"><a name="l00539"></a><span class="lineno"> 539</span>  <a class="code" href="a03575.html">is_constructible<__weak_ptr<_Tp></a>, _Arg>::value</div><div class="line"><a name="l00540"></a><span class="lineno"> 540</span>  >::type;</div><div class="line"><a name="l00541"></a><span class="lineno"> 541</span> </div><div class="line"><a name="l00542"></a><span class="lineno"> 542</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Arg></div><div class="line"><a name="l00543"></a><span class="lineno"> 543</span>  <span class="keyword">using</span> _Assignable = <span class="keyword">typename</span> <a class="code" href="a04191.html">enable_if</a><</div><div class="line"><a name="l00544"></a><span class="lineno"> 544</span>  <a class="code" href="a03683.html">is_assignable<__weak_ptr<_Tp></a>&, _Arg>::value, <a class="code" href="a06859.html">weak_ptr</a>&</div><div class="line"><a name="l00545"></a><span class="lineno"> 545</span>  >::type;</div><div class="line"><a name="l00546"></a><span class="lineno"> 546</span> </div><div class="line"><a name="l00547"></a><span class="lineno"> 547</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00548"></a><span class="lineno"> 548</span>  constexpr <a class="code" href="a06859.html">weak_ptr</a>() noexcept = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00549"></a><span class="lineno"> 549</span> </div><div class="line"><a name="l00550"></a><span class="lineno"> 550</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp,</div><div class="line"><a name="l00551"></a><span class="lineno"> 551</span>  <span class="keyword">typename</span> = _Constructible<const shared_ptr<_Yp>&>></div><div class="line"><a name="l00552"></a><span class="lineno"> 552</span>  <a class="code" href="a06859.html">weak_ptr</a>(<span class="keyword">const</span> <a class="code" href="a06851.html">shared_ptr<_Yp></a>& __r) noexcept</div><div class="line"><a name="l00553"></a><span class="lineno"> 553</span>  : __weak_ptr<_Tp>(__r) { }</div><div class="line"><a name="l00554"></a><span class="lineno"> 554</span> </div><div class="line"><a name="l00555"></a><span class="lineno"> 555</span>  <a class="code" href="a06859.html">weak_ptr</a>(<span class="keyword">const</span> <a class="code" href="a06859.html">weak_ptr</a>&) noexcept = <span class="keywordflow">default</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="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _Constructible<const weak_ptr<_Yp>&>></div><div class="line"><a name="l00558"></a><span class="lineno"> 558</span>  <a class="code" href="a06859.html">weak_ptr</a>(<span class="keyword">const</span> <a class="code" href="a06859.html">weak_ptr<_Yp></a>& __r) noexcept</div><div class="line"><a name="l00559"></a><span class="lineno"> 559</span>  : __weak_ptr<_Tp>(__r) { }</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>  <a class="code" href="a06859.html">weak_ptr</a>(<a class="code" href="a06859.html">weak_ptr</a>&&) noexcept = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00562"></a><span class="lineno"> 562</span> </div><div class="line"><a name="l00563"></a><span class="lineno"> 563</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp, <span class="keyword">typename</span> = _Constructible<weak_ptr<_Yp>>></div><div class="line"><a name="l00564"></a><span class="lineno"> 564</span>  <a class="code" href="a06859.html">weak_ptr</a>(<a class="code" href="a06859.html">weak_ptr<_Yp></a>&& __r) noexcept</div><div class="line"><a name="l00565"></a><span class="lineno"> 565</span>  : __weak_ptr<_Tp>(std::move(__r)) { }</div><div class="line"><a name="l00566"></a><span class="lineno"> 566</span> </div><div class="line"><a name="l00567"></a><span class="lineno"> 567</span>  <a class="code" href="a06859.html">weak_ptr</a>&</div><div class="line"><a name="l00568"></a><span class="lineno"> 568</span>  operator=(<span class="keyword">const</span> <a class="code" href="a06859.html">weak_ptr</a>& __r) noexcept = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00569"></a><span class="lineno"> 569</span> </div><div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l00571"></a><span class="lineno"> 571</span>  _Assignable<const weak_ptr<_Yp>&></div><div class="line"><a name="l00572"></a><span class="lineno"> 572</span>  operator=(<span class="keyword">const</span> <a class="code" href="a06859.html">weak_ptr<_Yp></a>& __r) noexcept</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>  this->__weak_ptr<_Tp>::operator=(__r);</div><div class="line"><a name="l00575"></a><span class="lineno"> 575</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00576"></a><span class="lineno"> 576</span>  }</div><div class="line"><a name="l00577"></a><span class="lineno"> 577</span> </div><div class="line"><a name="l00578"></a><span class="lineno"> 578</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l00579"></a><span class="lineno"> 579</span>  _Assignable<const shared_ptr<_Yp>&></div><div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  operator=(<span class="keyword">const</span> <a class="code" href="a06851.html">shared_ptr<_Yp></a>& __r) noexcept</div><div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  {</div><div class="line"><a name="l00582"></a><span class="lineno"> 582</span>  this->__weak_ptr<_Tp>::operator=(__r);</div><div class="line"><a name="l00583"></a><span class="lineno"> 583</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  }</div><div class="line"><a name="l00585"></a><span class="lineno"> 585</span> </div><div class="line"><a name="l00586"></a><span class="lineno"> 586</span>  <a class="code" href="a06859.html">weak_ptr</a>&</div><div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  operator=(<a class="code" href="a06859.html">weak_ptr</a>&& __r) noexcept = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00588"></a><span class="lineno"> 588</span> </div><div class="line"><a name="l00589"></a><span class="lineno"> 589</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Yp></div><div class="line"><a name="l00590"></a><span class="lineno"> 590</span>  _Assignable<weak_ptr<_Yp>></div><div class="line"><a name="l00591"></a><span class="lineno"> 591</span>  operator=(<a class="code" href="a06859.html">weak_ptr<_Yp></a>&& __r) noexcept</div><div class="line"><a name="l00592"></a><span class="lineno"> 592</span>  {</div><div class="line"><a name="l00593"></a><span class="lineno"> 593</span>  this->__weak_ptr<_Tp>::operator=(std::move(__r));</div><div class="line"><a name="l00594"></a><span class="lineno"> 594</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</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>  <a class="code" href="a06851.html">shared_ptr<_Tp></a></div><div class="line"><a name="l00598"></a><span class="lineno"> 598</span>  lock() <span class="keyword">const</span> noexcept</div><div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  { <span class="keywordflow">return</span> <a class="code" href="a06851.html">shared_ptr<_Tp></a>(*<span class="keyword">this</span>, std::nothrow); }</div><div class="line"><a name="l00600"></a><span class="lineno"> 600</span>  };</div><div class="line"><a name="l00601"></a><span class="lineno"> 601</span> </div><div class="line"><a name="l00602"></a><span class="lineno"> 602</span> <span class="preprocessor">#if __cpp_deduction_guides >= 201606</span></div><div class="line"><a name="l00603"></a><span class="lineno"> 603</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00604"></a><span class="lineno"> 604</span>  <a class="code" href="a06859.html">weak_ptr</a>(<a class="code" href="a06851.html">shared_ptr<_Tp></a>) -> <a class="code" href="a06859.html">weak_ptr<_Tp></a>;</div><div class="line"><a name="l00605"></a><span class="lineno"> 605</span> <span class="preprocessor">#endif</span></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="comment">// 20.7.2.3.6 weak_ptr specialized algorithms.</span></div><div class="line"><a name="l00608"></a><span class="lineno"> 608</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00609"></a><span class="lineno"> 609</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00610"></a><span class="lineno"> 610</span>  swap(<a class="code" href="a06859.html">weak_ptr<_Tp></a>& __a, <a class="code" href="a06859.html">weak_ptr<_Tp></a>& __b) noexcept</div><div class="line"><a name="l00611"></a><span class="lineno"> 611</span>  { __a.swap(__b); }</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="comment"></span></div><div class="line"><a name="l00614"></a><span class="lineno"> 614</span> <span class="comment"> /// Primary template owner_less</span></div><div class="line"><a name="l00615"></a><span class="lineno"> 615</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Tp = <span class="keywordtype">void</span>></div><div class="line"><a name="l00616"></a><span class="lineno"><a class="line" href="a06863.html"> 616</a></span>  <span class="keyword">struct </span><a class="code" href="a06863.html">owner_less</a>;</div><div class="line"><a name="l00617"></a><span class="lineno"> 617</span> <span class="comment"></span></div><div class="line"><a name="l00618"></a><span class="lineno"> 618</span> <span class="comment"> /// Void specialization of owner_less</span></div><div class="line"><a name="l00619"></a><span class="lineno"> 619</span> <span class="comment"></span> <span class="keyword">template</span><></div><div class="line"><a name="l00620"></a><span class="lineno"><a class="line" href="a06867.html"> 620</a></span>  <span class="keyword">struct </span><a class="code" href="a06863.html">owner_less</a><void> : _Sp_owner_less<void, void></div><div class="line"><a name="l00621"></a><span class="lineno"> 621</span>  { };</div><div class="line"><a name="l00622"></a><span class="lineno"> 622</span> <span class="comment"></span></div><div class="line"><a name="l00623"></a><span class="lineno"> 623</span> <span class="comment"> /// Partial specialization of owner_less for shared_ptr.</span></div><div class="line"><a name="l00624"></a><span class="lineno"> 624</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00625"></a><span class="lineno"><a class="line" href="a06871.html"> 625</a></span>  <span class="keyword">struct </span><a class="code" href="a06863.html">owner_less</a><<a class="code" href="a06851.html">shared_ptr</a><_Tp>></div><div class="line"><a name="l00626"></a><span class="lineno"> 626</span>  : <span class="keyword">public</span> _Sp_owner_less<shared_ptr<_Tp>, weak_ptr<_Tp>></div><div class="line"><a name="l00627"></a><span class="lineno"> 627</span>  { };</div><div class="line"><a name="l00628"></a><span class="lineno"> 628</span> <span class="comment"></span></div><div class="line"><a name="l00629"></a><span class="lineno"> 629</span> <span class="comment"> /// Partial specialization of owner_less for weak_ptr.</span></div><div class="line"><a name="l00630"></a><span class="lineno"> 630</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00631"></a><span class="lineno"><a class="line" href="a06875.html"> 631</a></span>  <span class="keyword">struct </span><a class="code" href="a06863.html">owner_less</a><<a class="code" href="a06859.html">weak_ptr</a><_Tp>></div><div class="line"><a name="l00632"></a><span class="lineno"> 632</span>  : <span class="keyword">public</span> _Sp_owner_less<weak_ptr<_Tp>, shared_ptr<_Tp>></div><div class="line"><a name="l00633"></a><span class="lineno"> 633</span>  { };</div><div class="line"><a name="l00634"></a><span class="lineno"> 634</span> <span class="comment"></span></div><div class="line"><a name="l00635"></a><span class="lineno"> 635</span> <span class="comment"> /**</span></div><div class="line"><a name="l00636"></a><span class="lineno"> 636</span> <span class="comment"> * @brief Base class allowing use of member function shared_from_this.</span></div><div class="line"><a name="l00637"></a><span class="lineno"> 637</span> <span class="comment"> */</span></div><div class="line"><a name="l00638"></a><span class="lineno"> 638</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00639"></a><span class="lineno"><a class="line" href="a06879.html"> 639</a></span>  <span class="keyword">class </span><a class="code" href="a06879.html">enable_shared_from_this</a></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>  <span class="keyword">protected</span>:</div><div class="line"><a name="l00642"></a><span class="lineno"> 642</span>  constexpr <a class="code" href="a06879.html">enable_shared_from_this</a>() noexcept { }</div><div class="line"><a name="l00643"></a><span class="lineno"> 643</span> </div><div class="line"><a name="l00644"></a><span class="lineno"> 644</span>  <a class="code" href="a06879.html">enable_shared_from_this</a>(<span class="keyword">const</span> <a class="code" href="a06879.html">enable_shared_from_this</a>&) noexcept { }</div><div class="line"><a name="l00645"></a><span class="lineno"> 645</span> </div><div class="line"><a name="l00646"></a><span class="lineno"> 646</span>  <a class="code" href="a06879.html">enable_shared_from_this</a>&</div><div class="line"><a name="l00647"></a><span class="lineno"> 647</span>  operator=(<span class="keyword">const</span> <a class="code" href="a06879.html">enable_shared_from_this</a>&) noexcept</div><div class="line"><a name="l00648"></a><span class="lineno"> 648</span>  { <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00649"></a><span class="lineno"> 649</span> </div><div class="line"><a name="l00650"></a><span class="lineno"> 650</span>  ~<a class="code" href="a06879.html">enable_shared_from_this</a>() { }</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">public</span>:</div><div class="line"><a name="l00653"></a><span class="lineno"> 653</span>  <a class="code" href="a06851.html">shared_ptr<_Tp></a></div><div class="line"><a name="l00654"></a><span class="lineno"> 654</span>  shared_from_this()</div><div class="line"><a name="l00655"></a><span class="lineno"> 655</span>  { <span class="keywordflow">return</span> <a class="code" href="a06851.html">shared_ptr<_Tp></a>(this->_M_weak_this); }</div><div class="line"><a name="l00656"></a><span class="lineno"> 656</span> </div><div class="line"><a name="l00657"></a><span class="lineno"> 657</span>  <a class="code" href="a06851.html">shared_ptr<const _Tp></a></div><div class="line"><a name="l00658"></a><span class="lineno"> 658</span>  shared_from_this()<span class="keyword"> const</span></div><div class="line"><a name="l00659"></a><span class="lineno"> 659</span> <span class="keyword"> </span>{ <span class="keywordflow">return</span> <a class="code" href="a06851.html">shared_ptr<const _Tp></a>(this->_M_weak_this); }</div><div class="line"><a name="l00660"></a><span class="lineno"> 660</span> </div><div class="line"><a name="l00661"></a><span class="lineno"> 661</span> <span class="preprocessor">#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11</span></div><div class="line"><a name="l00662"></a><span class="lineno"> 662</span> <span class="preprocessor">#define __cpp_lib_enable_shared_from_this 201603</span></div><div class="line"><a name="l00663"></a><span class="lineno"> 663</span>  <a class="code" href="a06859.html">weak_ptr<_Tp></a></div><div class="line"><a name="l00664"></a><span class="lineno"> 664</span>  weak_from_this() noexcept</div><div class="line"><a name="l00665"></a><span class="lineno"> 665</span>  { <span class="keywordflow">return</span> this->_M_weak_this; }</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>  <a class="code" href="a06859.html">weak_ptr<const _Tp></a></div><div class="line"><a name="l00668"></a><span class="lineno"> 668</span>  weak_from_this() <span class="keyword">const</span> noexcept</div><div class="line"><a name="l00669"></a><span class="lineno"> 669</span>  { <span class="keywordflow">return</span> this->_M_weak_this; }</div><div class="line"><a name="l00670"></a><span class="lineno"> 670</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00671"></a><span class="lineno"> 671</span> </div><div class="line"><a name="l00672"></a><span class="lineno"> 672</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00673"></a><span class="lineno"> 673</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1></div><div class="line"><a name="l00674"></a><span class="lineno"> 674</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00675"></a><span class="lineno"> 675</span>  _M_weak_assign(_Tp1* __p, <span class="keyword">const</span> __shared_count<>& __n) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l00676"></a><span class="lineno"> 676</span>  { _M_weak_this._M_assign(__p, __n); }</div><div class="line"><a name="l00677"></a><span class="lineno"> 677</span> </div><div class="line"><a name="l00678"></a><span class="lineno"> 678</span>  <span class="comment">// Found by ADL when this is an associated class.</span></div><div class="line"><a name="l00679"></a><span class="lineno"> 679</span>  <span class="keyword">friend</span> <span class="keyword">const</span> <a class="code" href="a06879.html">enable_shared_from_this</a>*</div><div class="line"><a name="l00680"></a><span class="lineno"> 680</span>  __enable_shared_from_this_base(<span class="keyword">const</span> __shared_count<>&,</div><div class="line"><a name="l00681"></a><span class="lineno"> 681</span>  <span class="keyword">const</span> <a class="code" href="a06879.html">enable_shared_from_this</a>* __p)</div><div class="line"><a name="l00682"></a><span class="lineno"> 682</span>  { <span class="keywordflow">return</span> __p; }</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="keyword">template</span><<span class="keyword">typename</span>, _Lock_policy></div><div class="line"><a name="l00685"></a><span class="lineno"> 685</span>  <span class="keyword">friend</span> <span class="keyword">class </span>__shared_ptr;</div><div class="line"><a name="l00686"></a><span class="lineno"> 686</span> </div><div class="line"><a name="l00687"></a><span class="lineno"> 687</span>  <span class="keyword">mutable</span> <a class="code" href="a06859.html">weak_ptr<_Tp></a> _M_weak_this;</div><div class="line"><a name="l00688"></a><span class="lineno"> 688</span>  };</div><div class="line"><a name="l00689"></a><span class="lineno"> 689</span> <span class="comment"></span></div><div class="line"><a name="l00690"></a><span class="lineno"> 690</span> <span class="comment"> /**</span></div><div class="line"><a name="l00691"></a><span class="lineno"> 691</span> <span class="comment"> * @brief Create an object that is owned by a shared_ptr.</span></div><div class="line"><a name="l00692"></a><span class="lineno"> 692</span> <span class="comment"> * @param __a An allocator.</span></div><div class="line"><a name="l00693"></a><span class="lineno"> 693</span> <span class="comment"> * @param __args Arguments for the @a _Tp object's constructor.</span></div><div class="line"><a name="l00694"></a><span class="lineno"> 694</span> <span class="comment"> * @return A shared_ptr that owns the newly created object.</span></div><div class="line"><a name="l00695"></a><span class="lineno"> 695</span> <span class="comment"> * @throw An exception thrown from @a _Alloc::allocate or from the</span></div><div class="line"><a name="l00696"></a><span class="lineno"> 696</span> <span class="comment"> * constructor of @a _Tp.</span></div><div class="line"><a name="l00697"></a><span class="lineno"> 697</span> <span class="comment"> *</span></div><div class="line"><a name="l00698"></a><span class="lineno"> 698</span> <span class="comment"> * A copy of @a __a will be used to allocate memory for the shared_ptr</span></div><div class="line"><a name="l00699"></a><span class="lineno"> 699</span> <span class="comment"> * and the new object.</span></div><div class="line"><a name="l00700"></a><span class="lineno"> 700</span> <span class="comment"> */</span></div><div class="line"><a name="l00701"></a><span class="lineno"> 701</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="l00702"></a><span class="lineno"> 702</span>  <span class="keyword">inline</span> <a class="code" href="a06851.html">shared_ptr<_Tp></a></div><div class="line"><a name="l00703"></a><span class="lineno"><a class="line" href="a01475.html#ga84894e14d771a93b933577b3f8f191cc"> 703</a></span>  <a class="code" href="a01475.html#ga84894e14d771a93b933577b3f8f191cc">allocate_shared</a>(<span class="keyword">const</span> _Alloc& __a, _Args&&... __args)</div><div class="line"><a name="l00704"></a><span class="lineno"> 704</span>  {</div><div class="line"><a name="l00705"></a><span class="lineno"> 705</span>  <span class="keywordflow">return</span> <a class="code" href="a06851.html">shared_ptr<_Tp></a>(_Sp_alloc_shared_tag<_Alloc>{__a},</div><div class="line"><a name="l00706"></a><span class="lineno"> 706</span>  std::forward<_Args>(__args)...);</div><div class="line"><a name="l00707"></a><span class="lineno"> 707</span>  }</div><div class="line"><a name="l00708"></a><span class="lineno"> 708</span> <span class="comment"></span></div><div class="line"><a name="l00709"></a><span class="lineno"> 709</span> <span class="comment"> /**</span></div><div class="line"><a name="l00710"></a><span class="lineno"> 710</span> <span class="comment"> * @brief Create an object that is owned by a shared_ptr.</span></div><div class="line"><a name="l00711"></a><span class="lineno"> 711</span> <span class="comment"> * @param __args Arguments for the @a _Tp object's constructor.</span></div><div class="line"><a name="l00712"></a><span class="lineno"> 712</span> <span class="comment"> * @return A shared_ptr that owns the newly created object.</span></div><div class="line"><a name="l00713"></a><span class="lineno"> 713</span> <span class="comment"> * @throw std::bad_alloc, or an exception thrown from the</span></div><div class="line"><a name="l00714"></a><span class="lineno"> 714</span> <span class="comment"> * constructor of @a _Tp.</span></div><div class="line"><a name="l00715"></a><span class="lineno"> 715</span> <span class="comment"> */</span></div><div class="line"><a name="l00716"></a><span class="lineno"> 716</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span>... _Args></div><div class="line"><a name="l00717"></a><span class="lineno"> 717</span>  <span class="keyword">inline</span> shared_ptr<_Tp></div><div class="line"><a name="l00718"></a><span class="lineno"><a class="line" href="a01475.html#ga1f3ad1c876ee5b203367e06d74fe0bf2"> 718</a></span>  <a class="code" href="a01475.html#ga1f3ad1c876ee5b203367e06d74fe0bf2">make_shared</a>(_Args&&... __args)</div><div class="line"><a name="l00719"></a><span class="lineno"> 719</span>  {</div><div class="line"><a name="l00720"></a><span class="lineno"> 720</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::remove_cv<_Tp>::type _Tp_nc;</div><div class="line"><a name="l00721"></a><span class="lineno"> 721</span>  <span class="keywordflow">return</span> std::allocate_shared<_Tp>(<a class="code" href="a04707.html">std::allocator<_Tp_nc></a>(),</div><div class="line"><a name="l00722"></a><span class="lineno"> 722</span>  std::forward<_Args>(__args)...);</div><div class="line"><a name="l00723"></a><span class="lineno"> 723</span>  }</div><div class="line"><a name="l00724"></a><span class="lineno"> 724</span> <span class="comment"></span></div><div class="line"><a name="l00725"></a><span class="lineno"> 725</span> <span class="comment"> /// std::hash specialization for shared_ptr.</span></div><div class="line"><a name="l00726"></a><span class="lineno"> 726</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00727"></a><span class="lineno"><a class="line" href="a06883.html"> 727</a></span>  <span class="keyword">struct </span><a class="code" href="a02839.html">hash</a><<a class="code" href="a06851.html">shared_ptr</a><_Tp>></div><div class="line"><a name="l00728"></a><span class="lineno"> 728</span>  : <span class="keyword">public</span> __hash_base<size_t, shared_ptr<_Tp>></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>  <span class="keywordtype">size_t</span></div><div class="line"><a name="l00731"></a><span class="lineno"> 731</span>  operator()(<span class="keyword">const</span> <a class="code" href="a06851.html">shared_ptr<_Tp></a>& __s) <span class="keyword">const</span> noexcept</div><div class="line"><a name="l00732"></a><span class="lineno"> 732</span>  {</div><div class="line"><a name="l00733"></a><span class="lineno"> 733</span>  <span class="keywordflow">return</span> <a class="code" href="a02839.html">std::hash<typename shared_ptr<_Tp>::element_type</a>*>()(__s.get());</div><div class="line"><a name="l00734"></a><span class="lineno"> 734</span>  }</div><div class="line"><a name="l00735"></a><span class="lineno"> 735</span>  };</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>  <span class="comment">// @} group pointer_abstractions</span></div><div class="line"><a name="l00738"></a><span class="lineno"> 738</span> </div><div class="line"><a name="l00739"></a><span class="lineno"> 739</span> _GLIBCXX_END_NAMESPACE_VERSION</div><div class="line"><a name="l00740"></a><span class="lineno"> 740</span> } <span class="comment">// namespace</span></div><div class="line"><a name="l00741"></a><span class="lineno"> 741</span> </div><div class="line"><a name="l00742"></a><span class="lineno"> 742</span> <span class="preprocessor">#endif // _SHARED_PTR_H</span></div><div class="ttc" id="a06851_html_aae3d23f345adfb0284614b4d1bfdd7b3"><div class="ttname"><a href="a06851.html#aae3d23f345adfb0284614b4d1bfdd7b3">std::shared_ptr::allocate_shared</a></div><div class="ttdeci">friend shared_ptr< _Yp > allocate_shared(const _Alloc &__a, _Args &&... __args)</div><div class="ttdoc">Create an object that is owned by a shared_ptr.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00703">bits/shared_ptr.h:703</a></div></div>
<div class="ttc" id="a06859_html"><div class="ttname"><a href="a06859.html">std::weak_ptr</a></div><div class="ttdoc">A smart pointer with weak semantics.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00535">bits/shared_ptr.h:535</a></div></div>
<div class="ttc" id="a01475_html_ga1f3ad1c876ee5b203367e06d74fe0bf2"><div class="ttname"><a href="a01475.html#ga1f3ad1c876ee5b203367e06d74fe0bf2">std::make_shared</a></div><div class="ttdeci">shared_ptr< _Tp > make_shared(_Args &&... __args)</div><div class="ttdoc">Create an object that is owned by a shared_ptr.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00718">bits/shared_ptr.h:718</a></div></div>
<div class="ttc" id="a07967_html"><div class="ttname"><a href="a07967.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#l00168">unique_ptr.h:168</a></div></div>
<div class="ttc" id="a06851_html_a4497f1d5421073bd8c1ee305414c4e80"><div class="ttname"><a href="a06851.html#a4497f1d5421073bd8c1ee305414c4e80">std::shared_ptr::shared_ptr</a></div><div class="ttdeci">constexpr shared_ptr() noexcept</div><div class="ttdoc">Construct an empty shared_ptr.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00127">bits/shared_ptr.h:127</a></div></div>
<div class="ttc" id="a06851_html_a5bd9976c3d66cf2a62904ebaeeab76e6"><div class="ttname"><a href="a06851.html#a5bd9976c3d66cf2a62904ebaeeab76e6">std::shared_ptr::shared_ptr</a></div><div class="ttdeci">shared_ptr(shared_ptr &&__r) noexcept</div><div class="ttdoc">Move-constructs a shared_ptr instance from __r.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00254">bits/shared_ptr.h:254</a></div></div>
<div class="ttc" id="a08455_html"><div class="ttname"><a href="a08455.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="a00722_source.html#l00089">auto_ptr.h:89</a></div></div>
<div class="ttc" id="a04707_html"><div class="ttname"><a href="a04707.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="a01475_html_ga84894e14d771a93b933577b3f8f191cc"><div class="ttname"><a href="a01475.html#ga84894e14d771a93b933577b3f8f191cc">std::allocate_shared</a></div><div class="ttdeci">shared_ptr< _Tp > allocate_shared(const _Alloc &__a, _Args &&... __args)</div><div class="ttdoc">Create an object that is owned by a shared_ptr.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00703">bits/shared_ptr.h:703</a></div></div>
<div class="ttc" id="a06879_html"><div class="ttname"><a href="a06879.html">std::enable_shared_from_this</a></div><div class="ttdoc">Base class allowing use of member function shared_from_this.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00639">bits/shared_ptr.h:639</a></div></div>
<div class="ttc" id="a06851_html_aaab9ea5e4dc2ab2b17b5a25cd1b58cf3"><div class="ttname"><a href="a06851.html#aaab9ea5e4dc2ab2b17b5a25cd1b58cf3">std::shared_ptr::shared_ptr</a></div><div class="ttdeci">shared_ptr(const weak_ptr< _Yp > &__r)</div><div class="ttdoc">Constructs a shared_ptr that shares ownership with __r and stores a copy of the pointer stored in __r...</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00275">bits/shared_ptr.h:275</a></div></div>
<div class="ttc" id="a04191_html"><div class="ttname"><a href="a04191.html">std::enable_if</a></div><div class="ttdoc">Define a member typedef type only if a boolean constant is true.</div><div class="ttdef"><b>Definition:</b> <a href="a00167_source.html#l01913">type_traits:1913</a></div></div>
<div class="ttc" id="a06851_html_ac924c816f979c01f5adc42407b2fac83"><div class="ttname"><a href="a06851.html#ac924c816f979c01f5adc42407b2fac83">std::shared_ptr::shared_ptr</a></div><div class="ttdeci">constexpr shared_ptr(nullptr_t) noexcept</div><div class="ttdoc">Construct an empty shared_ptr.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00307">bits/shared_ptr.h:307</a></div></div>
<div class="ttc" id="a02839_html"><div class="ttname"><a href="a02839.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="a06863_html"><div class="ttname"><a href="a06863.html">std::owner_less</a></div><div class="ttdoc">Primary template owner_less.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00616">bits/shared_ptr.h:616</a></div></div>
<div class="ttc" id="a06851_html_a893642e27fcab50317ba7d91392c0871"><div class="ttname"><a href="a06851.html#a893642e27fcab50317ba7d91392c0871">std::shared_ptr::shared_ptr</a></div><div class="ttdeci">shared_ptr(nullptr_t __p, _Deleter __d)</div><div class="ttdoc">Construct a shared_ptr that owns a null pointer and the deleter __d.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00173">bits/shared_ptr.h:173</a></div></div>
<div class="ttc" id="a06851_html_a8b115d3d42304820c9942ddeb58644ee"><div class="ttname"><a href="a06851.html#a8b115d3d42304820c9942ddeb58644ee">std::shared_ptr::shared_ptr</a></div><div class="ttdeci">shared_ptr(_Yp *__p, _Deleter __d)</div><div class="ttdoc">Construct a shared_ptr that owns the pointer __p and the deleter __d.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00156">bits/shared_ptr.h:156</a></div></div>
<div class="ttc" id="a06851_html_a1dad8483fa6f0d7507549bb8200c4de9"><div class="ttname"><a href="a06851.html#a1dad8483fa6f0d7507549bb8200c4de9">std::shared_ptr::shared_ptr</a></div><div class="ttdeci">shared_ptr(const shared_ptr< _Yp > &__r) noexcept</div><div class="ttdoc">If __r is empty, constructs an empty shared_ptr; otherwise construct a shared_ptr that shares ownersh...</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00246">bits/shared_ptr.h:246</a></div></div>
<div class="ttc" id="a00506_html"><div class="ttname"><a href="a00506.html">shared_ptr_base.h</a></div></div>
<div class="ttc" id="a01541_html"><div class="ttname"><a href="a01541.html">std</a></div><div class="ttdoc">ISO C++ entities toplevel namespace is std.</div></div>
<div class="ttc" id="a03575_html"><div class="ttname"><a href="a03575.html">std::is_constructible</a></div><div class="ttdoc">is_constructible</div><div class="ttdef"><b>Definition:</b> <a href="a00167_source.html#l00872">type_traits:872</a></div></div>
<div class="ttc" id="a06851_html_a2b1f604b01d6faf7ed627624968e76b8"><div class="ttname"><a href="a06851.html#a2b1f604b01d6faf7ed627624968e76b8">std::shared_ptr::shared_ptr</a></div><div class="ttdeci">shared_ptr(_Yp *__p, _Deleter __d, _Alloc __a)</div><div class="ttdoc">Construct a shared_ptr that owns the pointer __p and the deleter __d.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00193">bits/shared_ptr.h:193</a></div></div>
<div class="ttc" id="a02463_html"><div class="ttname"><a href="a02463.html">std::basic_ostream</a></div><div class="ttdoc">Template class basic_ostream.</div><div class="ttdef"><b>Definition:</b> <a href="a00083_source.html#l00086">iosfwd:86</a></div></div>
<div class="ttc" id="a01541_html_a20aaa750b7ddf43635768c7b2d0385e6"><div class="ttname"><a href="a01541.html#a20aaa750b7ddf43635768c7b2d0385e6">std::operator<<</a></div><div class="ttdeci">std::basic_ostream< _CharT, _Traits > & operator<<(std::basic_ostream< _CharT, _Traits > &__os, const bitset< _Nb > &__x)</div><div class="ttdoc">Global I/O operators for bitsets.</div><div class="ttdef"><b>Definition:</b> <a href="a00047_source.html#l01534">bitset:1534</a></div></div>
<div class="ttc" id="a03683_html"><div class="ttname"><a href="a03683.html">std::is_assignable</a></div><div class="ttdoc">is_assignable</div><div class="ttdef"><b>Definition:</b> <a href="a00167_source.html#l01006">type_traits:1006</a></div></div>
<div class="ttc" id="a06851_html_a9c6e4362646c04f78bbaf043f90eb835"><div class="ttname"><a href="a06851.html#a9c6e4362646c04f78bbaf043f90eb835">std::shared_ptr::shared_ptr</a></div><div class="ttdeci">shared_ptr(const shared_ptr< _Yp > &__r, element_type *__p) noexcept</div><div class="ttdoc">Constructs a shared_ptr instance that stores __p and shares ownership with __r.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00234">bits/shared_ptr.h:234</a></div></div>
<div class="ttc" id="a06851_html"><div class="ttname"><a href="a06851.html">std::shared_ptr</a></div><div class="ttdoc">A smart pointer with reference-counted copy semantics.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00103">bits/shared_ptr.h:103</a></div></div>
<div class="ttc" id="a06851_html_a21c103ae1494cc05477bd22ec5c284fc"><div class="ttname"><a href="a06851.html#a21c103ae1494cc05477bd22ec5c284fc">std::shared_ptr::shared_ptr</a></div><div class="ttdeci">shared_ptr(shared_ptr< _Yp > &&__r) noexcept</div><div class="ttdoc">Move-constructs a shared_ptr instance from __r.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00263">bits/shared_ptr.h:263</a></div></div>
<div class="ttc" id="a06851_html_a124c2b4fe2cd0d7651eefd22ead8f2ec"><div class="ttname"><a href="a06851.html#a124c2b4fe2cd0d7651eefd22ead8f2ec">std::shared_ptr::shared_ptr</a></div><div class="ttdeci">shared_ptr(nullptr_t __p, _Deleter __d, _Alloc __a)</div><div class="ttdoc">Construct a shared_ptr that owns a null pointer and the deleter __d.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00212">bits/shared_ptr.h:212</a></div></div>
<div class="ttc" id="a01480_html_gacb5baec338e12b99cb6bddea7506c7c6"><div class="ttname"><a href="a01480.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="a06851_html_a7752bdf2d4dc3f4f5719fd05f2d92089"><div class="ttname"><a href="a06851.html#a7752bdf2d4dc3f4f5719fd05f2d92089">std::shared_ptr::shared_ptr</a></div><div class="ttdeci">shared_ptr(_Yp *__p)</div><div class="ttdoc">Construct a shared_ptr that owns the pointer __p.</div><div class="ttdef"><b>Definition:</b> <a href="a17112_source.html#l00139">bits/shared_ptr.h:139</a></div></div>
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