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<a href="a00461.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">// Implementation of std::reference_wrapper -*- 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) 2004-2018 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> <span class="comment"></span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">/** @file include/bits/refwrap.h</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * This is an internal header file, included by other library headers.</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * Do not attempt to use it directly. @headername{functional}</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> */</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="preprocessor">#ifndef _GLIBCXX_REFWRAP_H</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#define _GLIBCXX_REFWRAP_H 1</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#pragma GCC system_header</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#if __cplusplus < 201103L</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor"># include <<a class="code" href="a00299.html">bits/c++0x_warning.h</a>></span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#include <<a class="code" href="a00422.html">bits/move.h</a>></span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#include <<a class="code" href="a00380.html">bits/invoke.h</a>></span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor">#include <<a class="code" href="a00542.html">bits/stl_function.h</a>></span> <span class="comment">// for unary_function and binary_function</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="keyword">namespace </span><a class="code" href="a01538.html">std</a> _GLIBCXX_VISIBILITY(default)</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> {</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"></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> <span class="comment"> * Derives from @c unary_function or @c binary_function, or perhaps</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * nothing, depending on the number of arguments provided. The</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * primary template is the basis case, which derives nothing.</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> */</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span>... _ArgTypes></div><div class="line"><a name="l00053"></a><span class="lineno"><a class="line" href="a06456.html"> 53</a></span>  <span class="keyword">struct </span><a class="code" href="a06456.html">_Maybe_unary_or_binary_function</a> { };</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"></span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> /// Derives from @c unary_function, as appropriate.</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span> _T1></div><div class="line"><a name="l00057"></a><span class="lineno"><a class="line" href="a06460.html"> 57</a></span>  <span class="keyword">struct </span><a class="code" href="a06456.html">_Maybe_unary_or_binary_function</a><_Res, _T1></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  : <a class="code" href="a07308.html">std::unary_function</a><_T1, _Res> { };</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"></span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> /// Derives from @c binary_function, as appropriate.</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span> _T1, <span class="keyword">typename</span> _T2></div><div class="line"><a name="l00062"></a><span class="lineno"><a class="line" href="a06464.html"> 62</a></span>  <span class="keyword">struct </span><a class="code" href="a06456.html">_Maybe_unary_or_binary_function</a><_Res, _T1, _T2></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  : <a class="code" href="a07312.html">std::binary_function</a><_T1, _T2, _Res> { };</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Signature></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keyword">struct </span>_Mem_fn_traits;</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> </div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span> _Class, <span class="keyword">typename</span>... _ArgTypes></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keyword">struct </span>_Mem_fn_traits_base</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  {</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keyword">using</span> __result_type = _Res;</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keyword">using</span> __maybe_type</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  = <a class="code" href="a06456.html">_Maybe_unary_or_binary_function</a><_Res, _Class*, _ArgTypes...>;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keyword">using</span> __arity = <a class="code" href="a03040.html">integral_constant</a><size_t, <span class="keyword">sizeof</span>...(_ArgTypes)>;</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  };</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">#define _GLIBCXX_MEM_FN_TRAITS2(_CV, _REF, _LVAL, _RVAL) \</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="preprocessor"> template<typename _Res, typename _Class, typename... _ArgTypes> \</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor"> struct _Mem_fn_traits<_Res (_Class::*)(_ArgTypes...) _CV _REF> \</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="preprocessor"> : _Mem_fn_traits_base<_Res, _CV _Class, _ArgTypes...> \</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="preprocessor"> { \</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="preprocessor"> using __vararg = false_type; \</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="preprocessor"> }; \</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="preprocessor"> template<typename _Res, typename _Class, typename... _ArgTypes> \</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="preprocessor"> struct _Mem_fn_traits<_Res (_Class::*)(_ArgTypes... ...) _CV _REF> \</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="preprocessor"> : _Mem_fn_traits_base<_Res, _CV _Class, _ArgTypes...> \</span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="preprocessor"> { \</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="preprocessor"> using __vararg = true_type; \</span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="preprocessor"> };</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="preprocessor">#define _GLIBCXX_MEM_FN_TRAITS(_REF, _LVAL, _RVAL) \</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="preprocessor"> _GLIBCXX_MEM_FN_TRAITS2( , _REF, _LVAL, _RVAL) \</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="preprocessor"> _GLIBCXX_MEM_FN_TRAITS2(const , _REF, _LVAL, _RVAL) \</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="preprocessor"> _GLIBCXX_MEM_FN_TRAITS2(volatile , _REF, _LVAL, _RVAL) \</span></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="preprocessor"> _GLIBCXX_MEM_FN_TRAITS2(const volatile, _REF, _LVAL, _RVAL)</span></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> _GLIBCXX_MEM_FN_TRAITS( , <a class="code" href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">true_type</a>, <a class="code" href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">true_type</a>)</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> _GLIBCXX_MEM_FN_TRAITS(&, <a class="code" href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">true_type</a>, <a class="code" href="a01476.html#gaebe6729ab5488ecc76c762873d226857">false_type</a>)</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> _GLIBCXX_MEM_FN_TRAITS(&&, <a class="code" href="a01476.html#gaebe6729ab5488ecc76c762873d226857">false_type</a>, <a class="code" href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">true_type</a>)</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="preprocessor">#if __cplusplus > 201402L</span></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> _GLIBCXX_MEM_FN_TRAITS(noexcept, <a class="code" href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">true_type</a>, <a class="code" href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">true_type</a>)</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> _GLIBCXX_MEM_FN_TRAITS(& noexcept, <a class="code" href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">true_type</a>, <a class="code" href="a01476.html#gaebe6729ab5488ecc76c762873d226857">false_type</a>)</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> _GLIBCXX_MEM_FN_TRAITS(&& noexcept, <a class="code" href="a01476.html#gaebe6729ab5488ecc76c762873d226857">false_type</a>, <a class="code" href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">true_type</a>)</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> </div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="preprocessor">#undef _GLIBCXX_MEM_FN_TRAITS</span></div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="preprocessor">#undef _GLIBCXX_MEM_FN_TRAITS2</span></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"></span></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment"> /// If we have found a result_type, extract it.</span></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Functor, <span class="keyword">typename</span> = __<span class="keywordtype">void</span>_t<>></div><div class="line"><a name="l00112"></a><span class="lineno"><a class="line" href="a06572.html"> 112</a></span>  <span class="keyword">struct </span><a class="code" href="a06572.html">_Maybe_get_result_type</a></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  { };</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">template</span><<span class="keyword">typename</span> _Functor></div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keyword">struct </span><a class="code" href="a06572.html">_Maybe_get_result_type</a><_Functor,</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  __void_t<typename _Functor::result_type>></div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  { <span class="keyword">typedef</span> <span class="keyword">typename</span> _Functor::result_type result_type; };</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"></span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"> /**</span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> * Base class for any function object that has a weak result type, as</span></div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"> * defined in 20.8.2 [func.require] of C++11.</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="keyword">template</span><<span class="keyword">typename</span> _Functor></div><div class="line"><a name="l00125"></a><span class="lineno"><a class="line" href="a06580.html"> 125</a></span>  <span class="keyword">struct </span><a class="code" href="a06580.html">_Weak_result_type_impl</a></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  : <a class="code" href="a06572.html">_Maybe_get_result_type</a><_Functor></div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  { };</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment"></span></div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"> /// Retrieve the result type for a function type.</span></div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span>... _ArgTypes _GLIBCXX_NOEXCEPT_PARM></div><div class="line"><a name="l00131"></a><span class="lineno"><a class="line" href="a06584.html"> 131</a></span>  <span class="keyword">struct </span><a class="code" href="a06580.html">_Weak_result_type_impl</a><_Res(_ArgTypes...) _GLIBCXX_NOEXCEPT_QUAL></div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  { <span class="keyword">typedef</span> _Res result_type; };</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"></span></div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> /// Retrieve the result type for a varargs function type.</span></div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span>... _ArgTypes _GLIBCXX_NOEXCEPT_PARM></div><div class="line"><a name="l00136"></a><span class="lineno"><a class="line" href="a06588.html"> 136</a></span>  <span class="keyword">struct </span><a class="code" href="a06580.html">_Weak_result_type_impl</a><_Res(_ArgTypes......) _GLIBCXX_NOEXCEPT_QUAL></div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  { <span class="keyword">typedef</span> _Res result_type; };</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"></span></div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> /// Retrieve the result type for a function pointer.</span></div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span>... _ArgTypes _GLIBCXX_NOEXCEPT_PARM></div><div class="line"><a name="l00141"></a><span class="lineno"><a class="line" href="a06592.html"> 141</a></span>  <span class="keyword">struct </span><a class="code" href="a06580.html">_Weak_result_type_impl</a><_Res(*)(_ArgTypes...) _GLIBCXX_NOEXCEPT_QUAL></div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  { <span class="keyword">typedef</span> _Res result_type; };</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"></span></div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment"> /// Retrieve the result type for a varargs function pointer.</span></div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span>... _ArgTypes _GLIBCXX_NOEXCEPT_PARM></div><div class="line"><a name="l00146"></a><span class="lineno"><a class="line" href="a06596.html"> 146</a></span>  <span class="keyword">struct</span></div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <a class="code" href="a06580.html">_Weak_result_type_impl</a><_Res(*)(_ArgTypes......) _GLIBCXX_NOEXCEPT_QUAL></div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  { <span class="keyword">typedef</span> _Res result_type; };</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="comment">// Let _Weak_result_type_impl perform the real work.</span></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Functor,</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordtype">bool</span> = <a class="code" href="a03268.html">is_member_function_pointer<_Functor>::value</a>></div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keyword">struct </span>_Weak_result_type_memfun</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  : <a class="code" href="a06580.html">_Weak_result_type_impl</a><_Functor></div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  { };</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="comment">// A pointer to member function has a weak result type.</span></div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _MemFunPtr></div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keyword">struct </span>_Weak_result_type_memfun<_MemFunPtr, true></div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  {</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keyword">using</span> result_type = <span class="keyword">typename</span> _Mem_fn_traits<_MemFunPtr>::__result_type;</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  };</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span> </div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="comment">// A pointer to data member doesn't have a weak result type.</span></div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Func, <span class="keyword">typename</span> _Class></div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keyword">struct </span>_Weak_result_type_memfun<_Func _Class::*, false></div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  { };</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="comment"></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"> * Strip top-level cv-qualifiers from the function object and let</span></div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="comment"> * _Weak_result_type_memfun perform the real work.</span></div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="comment"> */</span></div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Functor></div><div class="line"><a name="l00174"></a><span class="lineno"><a class="line" href="a06612.html"> 174</a></span>  <span class="keyword">struct </span><a class="code" href="a06612.html">_Weak_result_type</a></div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  : _Weak_result_type_memfun<typename remove_cv<_Functor>::type></div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  { };</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span> </div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="comment">// Detect nested argument_type.</span></div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> = __<span class="keywordtype">void</span>_t<>></div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keyword">struct </span>_Refwrap_base_arg1</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  { };</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span> </div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="comment">// Nested argument_type.</span></div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="keyword">struct </span>_Refwrap_base_arg1<_Tp,</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  __void_t<typename _Tp::argument_type>></div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  {</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> _Tp::argument_type argument_type;</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  };</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span> </div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="comment">// Detect nested first_argument_type and second_argument_type.</span></div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> = __<span class="keywordtype">void</span>_t<>></div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="keyword">struct </span>_Refwrap_base_arg2</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  { };</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span> </div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="comment">// Nested first_argument_type and second_argument_type.</span></div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="keyword">struct </span>_Refwrap_base_arg2<_Tp,</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  __void_t<typename _Tp::first_argument_type,</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  typename _Tp::second_argument_type>></div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  {</div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> _Tp::first_argument_type first_argument_type;</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> _Tp::second_argument_type second_argument_type;</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  };</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> <span class="comment"></span></div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="comment"> /**</span></div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="comment"> * Derives from unary_function or binary_function when it</span></div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <span class="comment"> * can. Specializations handle all of the easy cases. The primary</span></div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <span class="comment"> * template determines what to do with a class type, which may</span></div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span> <span class="comment"> * derive from both unary_function and binary_function.</span></div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="comment"> */</span></div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00213"></a><span class="lineno"><a class="line" href="a06632.html"> 213</a></span>  <span class="keyword">struct </span><a class="code" href="a06632.html">_Reference_wrapper_base</a></div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  : <a class="code" href="a06612.html">_Weak_result_type</a><_Tp>, _Refwrap_base_arg1<_Tp>, _Refwrap_base_arg2<_Tp></div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  { };</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span> </div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="comment">// - a function type (unary)</span></div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span> _T1 _GLIBCXX_NOEXCEPT_PARM></div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keyword">struct </span><a class="code" href="a06632.html">_Reference_wrapper_base</a><_Res(_T1) _GLIBCXX_NOEXCEPT_QUAL></div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  : <a class="code" href="a07308.html">unary_function</a><_T1, _Res></div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  { };</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span> </div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span> _T1></div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="keyword">struct </span>_Reference_wrapper_base<_Res(_T1) const></div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  : unary_function<_T1, _Res></div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  { };</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span> </div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span> _T1></div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="keyword">struct </span>_Reference_wrapper_base<_Res(_T1) volatile></div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  : unary_function<_T1, _Res></div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  { };</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span> </div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span> _T1></div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <span class="keyword">struct </span>_Reference_wrapper_base<_Res(_T1) const volatile></div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  : unary_function<_T1, _Res></div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  { };</div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span> </div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="comment">// - a function type (binary)</span></div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span> _T1, <span class="keyword">typename</span> _T2 _GLIBCXX_NOEXCEPT_PARM></div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="keyword">struct </span>_Reference_wrapper_base<_Res(_T1, _T2) _GLIBCXX_NOEXCEPT_QUAL></div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  : binary_function<_T1, _T2, _Res></div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  { };</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span> </div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span> _T1, <span class="keyword">typename</span> _T2></div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keyword">struct </span>_Reference_wrapper_base<_Res(_T1, _T2) const></div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  : binary_function<_T1, _T2, _Res></div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  { };</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span> </div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span> _T1, <span class="keyword">typename</span> _T2></div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keyword">struct </span>_Reference_wrapper_base<_Res(_T1, _T2) volatile></div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  : binary_function<_T1, _T2, _Res></div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  { };</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span> </div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span> _T1, <span class="keyword">typename</span> _T2></div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="keyword">struct </span>_Reference_wrapper_base<_Res(_T1, _T2) const volatile></div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  : binary_function<_T1, _T2, _Res></div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  { };</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span> </div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="comment">// - a function pointer type (unary)</span></div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span> _T1 _GLIBCXX_NOEXCEPT_PARM></div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <span class="keyword">struct </span>_Reference_wrapper_base<_Res(*)(_T1) _GLIBCXX_NOEXCEPT_QUAL></div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  : unary_function<_T1, _Res></div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  { };</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span> </div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="comment">// - a function pointer type (binary)</span></div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Res, <span class="keyword">typename</span> _T1, <span class="keyword">typename</span> _T2 _GLIBCXX_NOEXCEPT_PARM></div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keyword">struct </span>_Reference_wrapper_base<_Res(*)(_T1, _T2) _GLIBCXX_NOEXCEPT_QUAL></div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  : binary_function<_T1, _T2, _Res></div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  { };</div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span> </div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  template<typename _Tp, bool = is_member_function_pointer<_Tp>::value></div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="keyword">struct </span>_Reference_wrapper_base_memfun</div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  : _Reference_wrapper_base<_Tp></div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  { };</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span> </div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _MemFunPtr></div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="keyword">struct </span>_Reference_wrapper_base_memfun<_MemFunPtr, true></div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  : _Mem_fn_traits<_MemFunPtr>::__maybe_type</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  {</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keyword">using</span> result_type = <span class="keyword">typename</span> _Mem_fn_traits<_MemFunPtr>::__result_type;</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  };</div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span> <span class="comment"></span></div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span> <span class="comment"> /**</span></div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span> <span class="comment"> * @brief Primary class template for reference_wrapper.</span></div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span> <span class="comment"> * @ingroup functors</span></div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span> <span class="comment"> * @{</span></div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span> <span class="comment"> */</span></div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  <span class="keyword">class </span>reference_wrapper</div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  : <span class="keyword">public</span> _Reference_wrapper_base_memfun<typename remove_cv<_Tp>::type></div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  {</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  _Tp* _M_data;</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span> </div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="keyword">typedef</span> _Tp type;</div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span> </div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  reference_wrapper(_Tp& __indata) noexcept</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  : _M_data(<a class="code" href="a01477.html#ga1954d5552e24586051011312041033f6">std::__addressof</a>(__indata))</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  { }</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span> </div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  reference_wrapper(_Tp&&) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span> </div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  reference_wrapper(<span class="keyword">const</span> reference_wrapper&) = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span> </div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  reference_wrapper&</div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  operator=(<span class="keyword">const</span> reference_wrapper&) = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span> </div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <span class="keyword">operator</span> _Tp&() <span class="keyword">const</span> noexcept</div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  { <span class="keywordflow">return</span> this->get(); }</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>  _Tp&</div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  get() const noexcept</div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  { <span class="keywordflow">return</span> *_M_data; }</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>  <span class="keyword">template</span><<span class="keyword">typename</span>... _Args></div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  <span class="keyword">typename</span> result_of<_Tp&(_Args&&...)>::type</div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  operator()(_Args&&... __args)<span class="keyword"> const</span></div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span> <span class="keyword"> </span>{</div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  <span class="keywordflow">return</span> <a class="code" href="a01477.html#ga5f5136396a5ab3c02543bb01d4364f40">std::__invoke</a>(get(), std::forward<_Args>(__args)...);</div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  }</div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  };</div><div class="line"><a name="l00322"></a><span class="lineno"> 322</span> </div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span> <span class="comment"></span></div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span> <span class="comment"> /// Denotes a reference should be taken to a variable.</span></div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  <span class="keyword">inline</span> reference_wrapper<_Tp></div><div class="line"><a name="l00327"></a><span class="lineno"><a class="line" href="a01538.html#a1912c220e1851d8dd8484d3cb6317b33"> 327</a></span>  <a class="code" href="a01538.html#a1912c220e1851d8dd8484d3cb6317b33">ref</a>(_Tp& __t) noexcept</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  { <span class="keywordflow">return</span> <a class="code" href="a04172.html">reference_wrapper<_Tp></a>(__t); }</div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span> <span class="comment"></span></div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span> <span class="comment"> /// Denotes a const reference should be taken to a variable.</span></div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  <span class="keyword">inline</span> reference_wrapper<const _Tp></div><div class="line"><a name="l00333"></a><span class="lineno"><a class="line" href="a01538.html#afc6f7bb2ebc4f03c54cdf91f5ecb1f15"> 333</a></span>  <a class="code" href="a01538.html#afc6f7bb2ebc4f03c54cdf91f5ecb1f15">cref</a>(<span class="keyword">const</span> _Tp& __t) noexcept</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  { <span class="keywordflow">return</span> <a class="code" href="a04172.html">reference_wrapper<const _Tp></a>(__t); }</div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span> </div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  <span class="keywordtype">void</span> <a class="code" href="a01538.html#a1912c220e1851d8dd8484d3cb6317b33">ref</a>(<span class="keyword">const</span> _Tp&&) = <span class="keyword">delete</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">typename</span> _Tp></div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  <span class="keywordtype">void</span> <a class="code" href="a01538.html#afc6f7bb2ebc4f03c54cdf91f5ecb1f15">cref</a>(<span class="keyword">const</span> _Tp&&) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span> <span class="comment"></span></div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span> <span class="comment"> /// std::ref overload to prevent wrapping a reference_wrapper</span></div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <span class="keyword">inline</span> reference_wrapper<_Tp></div><div class="line"><a name="l00345"></a><span class="lineno"><a class="line" href="a01538.html#aa6e7c9ad5dbd731664fab89868983bc8"> 345</a></span>  <a class="code" href="a01538.html#a1912c220e1851d8dd8484d3cb6317b33">ref</a>(<a class="code" href="a04172.html">reference_wrapper<_Tp></a> __t) noexcept</div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  { <span class="keywordflow">return</span> __t; }</div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span> <span class="comment"></span></div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span> <span class="comment"> /// std::cref overload to prevent wrapping a reference_wrapper</span></div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  <span class="keyword">inline</span> reference_wrapper<const _Tp></div><div class="line"><a name="l00351"></a><span class="lineno"><a class="line" href="a01538.html#a173f93c3bca58d0411f16989cce6fedc"> 351</a></span>  <a class="code" href="a01538.html#afc6f7bb2ebc4f03c54cdf91f5ecb1f15">cref</a>(<a class="code" href="a04172.html">reference_wrapper<_Tp></a> __t) noexcept</div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  { <span class="keywordflow">return</span> { __t.get() }; }</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>  <span class="comment">// @} group functors</span></div><div class="line"><a name="l00355"></a><span class="lineno"> 355</span> </div><div class="line"><a name="l00356"></a><span class="lineno"> 356</span> _GLIBCXX_END_NAMESPACE_VERSION</div><div class="line"><a name="l00357"></a><span class="lineno"> 357</span> } <span class="comment">// namespace std</span></div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span> </div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span> <span class="preprocessor">#endif // C++11</span></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> <span class="preprocessor">#endif // _GLIBCXX_REFWRAP_H</span></div><div class="ttc" id="a00422_html"><div class="ttname"><a href="a00422.html">move.h</a></div></div>
<div class="ttc" id="a00542_html"><div class="ttname"><a href="a00542.html">stl_function.h</a></div></div>
<div class="ttc" id="a03268_html"><div class="ttname"><a href="a03268.html">std::is_member_function_pointer</a></div><div class="ttdoc">is_member_function_pointer</div><div class="ttdef"><b>Definition:</b> <a href="a00167_source.html#l00418">type_traits:418</a></div></div>
<div class="ttc" id="a01476_html_gaebe6729ab5488ecc76c762873d226857"><div class="ttname"><a href="a01476.html#gaebe6729ab5488ecc76c762873d226857">std::false_type</a></div><div class="ttdeci">integral_constant< bool, false > false_type</div><div class="ttdoc">The type used as a compile-time boolean with false value.</div><div class="ttdef"><b>Definition:</b> <a href="a00167_source.html#l00078">type_traits:78</a></div></div>
<div class="ttc" id="a07312_html"><div class="ttname"><a href="a07312.html">std::binary_function</a></div><div class="ttdef"><b>Definition:</b> <a href="a00542_source.html#l00118">stl_function.h:118</a></div></div>
<div class="ttc" id="a06612_html"><div class="ttname"><a href="a06612.html">std::_Weak_result_type</a></div><div class="ttdef"><b>Definition:</b> <a href="a00461_source.html#l00174">refwrap.h:174</a></div></div>
<div class="ttc" id="a00299_html"><div class="ttname"><a href="a00299.html">c++0x_warning.h</a></div></div>
<div class="ttc" id="a01477_html_ga1954d5552e24586051011312041033f6"><div class="ttname"><a href="a01477.html#ga1954d5552e24586051011312041033f6">std::__addressof</a></div><div class="ttdeci">constexpr _Tp * __addressof(_Tp &__r) noexcept</div><div class="ttdoc">Same as C++11 std::addressof.</div><div class="ttdef"><b>Definition:</b> <a href="a00422_source.html#l00047">move.h:47</a></div></div>
<div class="ttc" id="a06632_html"><div class="ttname"><a href="a06632.html">std::_Reference_wrapper_base</a></div><div class="ttdef"><b>Definition:</b> <a href="a00461_source.html#l00213">refwrap.h:213</a></div></div>
<div class="ttc" id="a01476_html_ga6a860513044e23d34e553ea986e83fa1"><div class="ttname"><a href="a01476.html#ga6a860513044e23d34e553ea986e83fa1">std::true_type</a></div><div class="ttdeci">integral_constant< bool, true > true_type</div><div class="ttdoc">The type used as a compile-time boolean with true value.</div><div class="ttdef"><b>Definition:</b> <a href="a00167_source.html#l00075">type_traits:75</a></div></div>
<div class="ttc" id="a07308_html"><div class="ttname"><a href="a07308.html">std::unary_function</a></div><div class="ttdef"><b>Definition:</b> <a href="a00542_source.html#l00105">stl_function.h:105</a></div></div>
<div class="ttc" id="a01538_html"><div class="ttname"><a href="a01538.html">std</a></div><div class="ttdoc">ISO C++ entities toplevel namespace is std.</div></div>
<div class="ttc" id="a06572_html"><div class="ttname"><a href="a06572.html">std::_Maybe_get_result_type</a></div><div class="ttdoc">If we have found a result_type, extract it.</div><div class="ttdef"><b>Definition:</b> <a href="a00461_source.html#l00112">refwrap.h:112</a></div></div>
<div class="ttc" id="a01477_html_ga5f5136396a5ab3c02543bb01d4364f40"><div class="ttname"><a href="a01477.html#ga5f5136396a5ab3c02543bb01d4364f40">std::__invoke</a></div><div class="ttdeci">constexpr __invoke_result< _Callable, _Args... >::type __invoke(_Callable &&__fn, _Args &&... __args) noexcept(__is_nothrow_invocable< _Callable, _Args... >::value)</div><div class="ttdoc">Invoke a callable object.</div><div class="ttdef"><b>Definition:</b> <a href="a00380_source.html#l00089">invoke.h:89</a></div></div>
<div class="ttc" id="a06580_html"><div class="ttname"><a href="a06580.html">std::_Weak_result_type_impl</a></div><div class="ttdef"><b>Definition:</b> <a href="a00461_source.html#l00125">refwrap.h:125</a></div></div>
<div class="ttc" id="a03040_html"><div class="ttname"><a href="a03040.html">std::integral_constant</a></div><div class="ttdoc">integral_constant</div><div class="ttdef"><b>Definition:</b> <a href="a00167_source.html#l00057">type_traits:57</a></div></div>
<div class="ttc" id="a04172_html"><div class="ttname"><a href="a04172.html">std::reference_wrapper</a></div><div class="ttdoc">Primary class template for reference_wrapper.</div><div class="ttdef"><b>Definition:</b> <a href="a00167_source.html#l01887">type_traits:1887</a></div></div>
<div class="ttc" id="a00380_html"><div class="ttname"><a href="a00380.html">invoke.h</a></div></div>
<div class="ttc" id="a06456_html"><div class="ttname"><a href="a06456.html">std::_Maybe_unary_or_binary_function</a></div><div class="ttdef"><b>Definition:</b> <a href="a00461_source.html#l00053">refwrap.h:53</a></div></div>
<div class="ttc" id="a01538_html_afc6f7bb2ebc4f03c54cdf91f5ecb1f15"><div class="ttname"><a href="a01538.html#afc6f7bb2ebc4f03c54cdf91f5ecb1f15">std::cref</a></div><div class="ttdeci">reference_wrapper< const _Tp > cref(const _Tp &__t) noexcept</div><div class="ttdoc">Denotes a const reference should be taken to a variable.</div><div class="ttdef"><b>Definition:</b> <a href="a00461_source.html#l00333">refwrap.h:333</a></div></div>
<div class="ttc" id="a01538_html_a1912c220e1851d8dd8484d3cb6317b33"><div class="ttname"><a href="a01538.html#a1912c220e1851d8dd8484d3cb6317b33">std::ref</a></div><div class="ttdeci">reference_wrapper< _Tp > ref(_Tp &__t) noexcept</div><div class="ttdoc">Denotes a reference should be taken to a variable.</div><div class="ttdef"><b>Definition:</b> <a href="a00461_source.html#l00327">refwrap.h:327</a></div></div>
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