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<div class="title">optional.hpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">// Copyright (C) 2011 - 2012 Andrzej Krzemienski.</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">// Use, modification, and distribution is subject to the Boost Software</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment">// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment">// http://www.boost.org/LICENSE_1_0.txt)</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment">// The idea and interface is based on Boost.Optional library</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment">// authored by Fernando Luis Cacciola Carballal</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;</div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="preprocessor"># ifndef ___OPTIONAL_HPP___</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="preprocessor"># define ___OPTIONAL_HPP___</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="preprocessor"># include &lt;utility&gt;</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="preprocessor"># include &lt;type_traits&gt;</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="preprocessor"># include &lt;initializer_list&gt;</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="preprocessor"># include &lt;cassert&gt;</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="preprocessor"># include &lt;functional&gt;</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="preprocessor"># include &lt;string&gt;</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="preprocessor"># include &quot;athena/Global.hpp&quot;</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_REQUIRES(...) typename enable_if&lt;__VA_ARGS__::value, bool&gt;::type = false</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="preprocessor"># if defined __GNUC__ // NOTE: GNUC is also defined for Clang</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="preprocessor"># if (__GNUC__ == 4) &amp;&amp; (__GNUC_MINOR__ &gt;= 8)</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_GCC_4_8_AND_HIGHER___</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="preprocessor"># elif (__GNUC__ &gt; 4)</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_GCC_4_8_AND_HIGHER___</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;<span class="preprocessor">#</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;<span class="preprocessor"># if (__GNUC__ == 4) &amp;&amp; (__GNUC_MINOR__ &gt;= 7)</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_GCC_4_7_AND_HIGHER___</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;<span class="preprocessor"># elif (__GNUC__ &gt; 4)</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_GCC_4_7_AND_HIGHER___</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;<span class="preprocessor">#</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;<span class="preprocessor"># if (__GNUC__ == 4) &amp;&amp; (__GNUC_MINOR__ == 8) &amp;&amp; (__GNUC_PATCHLEVEL__ &gt;= 1)</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;<span class="preprocessor"># elif (__GNUC__ == 4) &amp;&amp; (__GNUC_MINOR__ &gt;= 9)</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;<span class="preprocessor"># elif (__GNUC__ &gt; 4)</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;<span class="preprocessor">#</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;<span class="preprocessor"># if defined __clang_major__</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160;<span class="preprocessor"># if (__clang_major__ == 3 &amp;&amp; __clang_minor__ &gt;= 5)</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160;<span class="preprocessor"># elif (__clang_major__ &gt; 3)</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;<span class="preprocessor"># if defined TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160;<span class="preprocessor"># elif (__clang_major__ == 3 &amp;&amp; __clang_minor__ == 4 &amp;&amp; __clang_patchlevel__ &gt;= 2)</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_</span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;<span class="preprocessor">#</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160;<span class="preprocessor"># if defined _MSC_VER</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;<span class="preprocessor"># if (_MSC_VER &gt;= 1900)</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_MSVC_2015_AND_HIGHER___</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;<span class="preprocessor"># if defined __clang__</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;<span class="preprocessor"># if (__clang_major__ &gt; 2) || (__clang_major__ == 2) &amp;&amp; (__clang_minor__ &gt;= 9)</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;<span class="preprocessor"># define OPTIONAL_HAS_THIS_RVALUE_REFS 1</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160;<span class="preprocessor"># else</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;<span class="preprocessor"># define OPTIONAL_HAS_THIS_RVALUE_REFS 0</span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;<span class="preprocessor"># elif defined TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;<span class="preprocessor"># define OPTIONAL_HAS_THIS_RVALUE_REFS 1</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;<span class="preprocessor"># elif defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160;<span class="preprocessor"># define OPTIONAL_HAS_THIS_RVALUE_REFS 1</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;<span class="preprocessor"># else</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160;<span class="preprocessor"># define OPTIONAL_HAS_THIS_RVALUE_REFS 0</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160;</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160;<span class="preprocessor"># if defined TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160;<span class="preprocessor"># define OPTIONAL_HAS_CONSTEXPR_INIT_LIST 1</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;<span class="preprocessor"># define OPTIONAL_CONSTEXPR_INIT_LIST constexpr</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160;<span class="preprocessor"># else</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160;<span class="preprocessor"># define OPTIONAL_HAS_CONSTEXPR_INIT_LIST 0</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;<span class="preprocessor"># define OPTIONAL_CONSTEXPR_INIT_LIST</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160;<span class="preprocessor"># if defined TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_ &amp;&amp; (defined __cplusplus) &amp;&amp; (__cplusplus != 201103L)</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160;<span class="preprocessor"># define OPTIONAL_HAS_MOVE_ACCESSORS 1</span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160;<span class="preprocessor"># else</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160;<span class="preprocessor"># define OPTIONAL_HAS_MOVE_ACCESSORS 0</span></div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160;<span class="preprocessor"># // In C++11 constexpr implies const, so we need to make non-const members also non-constexpr</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160;<span class="preprocessor"># if (defined __cplusplus) &amp;&amp; (__cplusplus == 201103L)</span></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160;<span class="preprocessor"># define OPTIONAL_MUTABLE_CONSTEXPR</span></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160;<span class="preprocessor"># else</span></div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160;<span class="preprocessor"># define OPTIONAL_MUTABLE_CONSTEXPR constexpr</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacestd.html">std</a>{</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160;</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160;<span class="keyword">namespace </span>experimental{</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160;<span class="comment">// BEGIN workaround for missing is_trivially_destructible</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160;<span class="preprocessor"># if defined TR2_OPTIONAL_GCC_4_8_AND_HIGHER___</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <span class="comment">// leave it: it is already there</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160;<span class="preprocessor"># elif defined TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_</span></div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; <span class="comment">// leave it: it is already there</span></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160;<span class="preprocessor"># elif defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___</span></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; <span class="comment">// leave it: it is already there</span></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160;<span class="preprocessor"># elif defined TR2_OPTIONAL_DISABLE_EMULATION_OF_TYPE_TRAITS</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; <span class="comment">// leave it: the user doesn&#39;t want it</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160;<span class="preprocessor"># else</span></div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; <span class="keyword">using</span> is_trivially_destructible = std::has_trivial_destructor&lt;T&gt;;</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160;<span class="comment">// END workaround for missing is_trivially_destructible</span></div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160;</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160;<span class="preprocessor"># if (defined TR2_OPTIONAL_GCC_4_7_AND_HIGHER___)</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; <span class="comment">// leave it; our metafunctions are already defined.</span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160;<span class="preprocessor"># elif defined TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_</span></div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; <span class="comment">// leave it; our metafunctions are already defined.</span></div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160;<span class="preprocessor"># elif defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___</span></div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; <span class="comment">// leave it: it is already there</span></div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160;<span class="preprocessor"># elif defined TR2_OPTIONAL_DISABLE_EMULATION_OF_TYPE_TRAITS</span></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; <span class="comment">// leave it: the user doesn&#39;t want it</span></div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160;<span class="preprocessor"># else</span></div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160;</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160;</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160;<span class="comment">// workaround for missing traits in GCC and CLANG</span></div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l00132"></a><span class="lineno"><a class="line" href="structstd_1_1experimental_1_1is__nothrow__move__constructible.html"> 132</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structstd_1_1experimental_1_1is__nothrow__move__constructible.html">is_nothrow_move_constructible</a></div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160;{</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; constexpr <span class="keyword">static</span> <span class="keywordtype">bool</span> value = std::is_nothrow_constructible&lt;T, T&amp;&amp;&gt;::value;</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160;};</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160;</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160;</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T, <span class="keyword">class</span> U&gt;</div><div class="line"><a name="l00139"></a><span class="lineno"><a class="line" href="structstd_1_1experimental_1_1is__assignable.html"> 139</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structstd_1_1experimental_1_1is__assignable.html">is_assignable</a></div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160;{</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span> X, <span class="keyword">class</span> Y&gt;</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160; constexpr <span class="keyword">static</span> <span class="keywordtype">bool</span> has_assign(...) { <span class="keywordflow">return</span> <span class="keyword">false</span>; }</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160;</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span> X, <span class="keyword">class</span> Y, <span class="keywordtype">size_t</span> S = sizeof((std::declval&lt;X&gt;() = std::declval&lt;Y&gt;(), true)) &gt;</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; <span class="comment">// the comma operator is necessary for the cases where operator= returns void</span></div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; constexpr <span class="keyword">static</span> <span class="keywordtype">bool</span> has_assign(<span class="keywordtype">bool</span>) { <span class="keywordflow">return</span> <span class="keyword">true</span>; }</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160;</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160; constexpr <span class="keyword">static</span> <span class="keywordtype">bool</span> value = has_assign&lt;T, U&gt;(<span class="keyword">true</span>);</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160;};</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160;</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160;</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l00153"></a><span class="lineno"><a class="line" href="structstd_1_1experimental_1_1is__nothrow__move__assignable.html"> 153</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structstd_1_1experimental_1_1is__nothrow__move__assignable.html">is_nothrow_move_assignable</a></div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160;{</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span> X, <span class="keywordtype">bool</span> has_any_move_assign&gt;</div><div class="line"><a name="l00156"></a><span class="lineno"><a class="line" href="structstd_1_1experimental_1_1is__nothrow__move__assignable_1_1has__nothrow__move__assign.html"> 156</a></span>&#160; <span class="keyword">struct </span><a class="code" href="structstd_1_1experimental_1_1is__nothrow__move__assignable_1_1has__nothrow__move__assign.html">has_nothrow_move_assign</a> {</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160; constexpr <span class="keyword">static</span> <span class="keywordtype">bool</span> value = <span class="keyword">false</span>;</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160; };</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160;</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span> X&gt;</div><div class="line"><a name="l00161"></a><span class="lineno"><a class="line" href="structstd_1_1experimental_1_1is__nothrow__move__assignable_1_1has__nothrow__move__assign_3_01X_00_01true_01_4.html"> 161</a></span>&#160; <span class="keyword">struct </span><a class="code" href="structstd_1_1experimental_1_1is__nothrow__move__assignable_1_1has__nothrow__move__assign.html">has_nothrow_move_assign</a>&lt;X, true&gt; {</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160; constexpr <span class="keyword">static</span> <span class="keywordtype">bool</span> value = noexcept( std::declval&lt;X&amp;&gt;() = std::declval&lt;X&amp;&amp;&gt;() );</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160; };</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160;</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160; constexpr <span class="keyword">static</span> <span class="keywordtype">bool</span> value = <a class="code" href="structstd_1_1experimental_1_1is__nothrow__move__assignable_1_1has__nothrow__move__assign.html">has_nothrow_move_assign&lt;T, is_assignable&lt;T&amp;, T&amp;&amp;&gt;::value</a>&gt;::value;</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160;};</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160;<span class="comment">// end workaround</span></div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160;</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160;</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160;</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160;</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160;</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160;<span class="comment">// 20.5.4, optional for object types</span></div><div class="line"><a name="l00175"></a><span class="lineno"><a class="line" href="classstd_1_1experimental_1_1optional.html"> 175</a></span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; <span class="keyword">class </span><a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>;</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160;</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160;<span class="comment">// 20.5.5, optional for lvalue reference types</span></div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; <span class="keyword">class </span><a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>&lt;T&amp;&gt;;</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160;</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160;</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160;<span class="comment">// workaround: std utility functions aren&#39;t constexpr yet</span></div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; <span class="keyword">inline</span> constexpr T&amp;&amp; constexpr_forward(<span class="keyword">typename</span> std::remove_reference&lt;T&gt;::type&amp; t) noexcept</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160;{</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160; <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>T&amp;&amp;<span class="keyword">&gt;</span>(t);</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160;}</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160;</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; <span class="keyword">inline</span> constexpr T&amp;&amp; constexpr_forward(<span class="keyword">typename</span> std::remove_reference&lt;T&gt;::type&amp;&amp; t) noexcept</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160;{</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160; static_assert(!std::is_lvalue_reference&lt;T&gt;::value, <span class="stringliteral">&quot;!!&quot;</span>);</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160; <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>T&amp;&amp;<span class="keyword">&gt;</span>(t);</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160;}</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>&#160;</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; <span class="keyword">inline</span> constexpr <span class="keyword">typename</span> std::remove_reference&lt;T&gt;::type&amp;&amp; constexpr_move(T&amp;&amp; t) noexcept</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>&#160;{</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>&#160; <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>typename std::remove_reference&lt;T&gt;::type&amp;&amp;<span class="keyword">&gt;</span>(t);</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>&#160;}</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>&#160;</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>&#160;</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>&#160;<span class="preprocessor">#if defined NDEBUG</span></div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_ASSERTED_EXPRESSION(CHECK, EXPR) (EXPR)</span></div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_ASSERTED_EXPRESSION(CHECK, EXPR) ((CHECK) ? (EXPR) : ([]{assert(!#CHECK);}(), (EXPR)))</span></div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>&#160;</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>&#160;</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>&#160;<span class="keyword">namespace </span>detail_</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>&#160;{</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>&#160;</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>&#160;<span class="comment">// static_addressof: a constexpr version of addressof</span></div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00211"></a><span class="lineno"><a class="line" href="structstd_1_1experimental_1_1detail___1_1has__overloaded__addressof.html"> 211</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structstd_1_1experimental_1_1detail___1_1has__overloaded__addressof.html">has_overloaded_addressof</a></div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>&#160;{</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span> X&gt;</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>&#160; constexpr <span class="keyword">static</span> <span class="keywordtype">bool</span> has_overload(...) { <span class="keywordflow">return</span> <span class="keyword">false</span>; }</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>&#160;</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span> X, <span class="keywordtype">size_t</span> S = sizeof(std::declval&lt;X&amp;&gt;().operator&amp;()) &gt;</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>&#160; constexpr <span class="keyword">static</span> <span class="keywordtype">bool</span> has_overload(<span class="keywordtype">bool</span>) { <span class="keywordflow">return</span> <span class="keyword">true</span>; }</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>&#160;</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>&#160; constexpr <span class="keyword">static</span> <span class="keywordtype">bool</span> value = has_overload&lt;T&gt;(<span class="keyword">true</span>);</div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>&#160;};</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>&#160;</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, TR2_OPTIONAL_REQUIRES(!has_overloaded_addressof&lt;T&gt;)&gt;</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>&#160;constexpr T* static_addressof(T&amp; ref)</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>&#160;{</div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>&#160; <span class="keywordflow">return</span> &amp;ref;</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>&#160;}</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>&#160;</div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, TR2_OPTIONAL_REQUIRES(has_overloaded_addressof&lt;T&gt;)&gt;</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>&#160;T* static_addressof(T&amp; ref)</div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>&#160;{</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>&#160; <span class="keywordflow">return</span> std::addressof(ref);</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>&#160;}</div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>&#160;</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span>&#160;</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>&#160;<span class="comment">// the call to convert&lt;A&gt;(b) has return type A and converts b to type A iff b decltype(b) is implicitly convertible to A</span></div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> U&gt;</div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>&#160;U convert(U v) { <span class="keywordflow">return</span> v; }</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>&#160;</div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>&#160;} <span class="comment">// namespace detail</span></div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>&#160;</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>&#160;</div><div class="line"><a name="l00242"></a><span class="lineno"><a class="line" href="structstd_1_1experimental_1_1trivial__init__t.html"> 242</a></span>&#160;constexpr <span class="keyword">struct </span><a class="code" href="structstd_1_1experimental_1_1trivial__init__t.html">trivial_init_t</a>{} trivial_init{};</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>&#160;</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>&#160;</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>&#160;<span class="comment">// 20.5.6, In-place construction</span></div><div class="line"><a name="l00246"></a><span class="lineno"><a class="line" href="structstd_1_1experimental_1_1in__place__t.html"> 246</a></span>&#160;constexpr <span class="keyword">struct </span><a class="code" href="structstd_1_1experimental_1_1in__place__t.html">in_place_t</a>{} in_place{};</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>&#160;</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>&#160;</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>&#160;<span class="comment">// 20.5.7, Disengaged state indicator</span></div><div class="line"><a name="l00250"></a><span class="lineno"><a class="line" href="structstd_1_1experimental_1_1nullopt__t.html"> 250</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a></div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>&#160;{</div><div class="line"><a name="l00252"></a><span class="lineno"><a class="line" href="structstd_1_1experimental_1_1nullopt__t_1_1init.html"> 252</a></span>&#160; <span class="keyword">struct </span><a class="code" href="structstd_1_1experimental_1_1nullopt__t_1_1init.html">init</a>{};</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span>&#160; constexpr <span class="keyword">explicit</span> <a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>(<a class="code" href="structstd_1_1experimental_1_1nullopt__t_1_1init.html">init</a>){}</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>&#160;};</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>&#160;constexpr <a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a> nullopt{<a class="code" href="structstd_1_1experimental_1_1nullopt__t_1_1init.html">nullopt_t::init</a>()};</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>&#160;</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>&#160;</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>&#160;<span class="comment">// 20.5.8, class bad_optional_access</span></div><div class="line"><a name="l00259"></a><span class="lineno"><a class="line" href="classstd_1_1experimental_1_1bad__optional__access.html"> 259</a></span>&#160;<span class="keyword">class </span><a class="code" href="classstd_1_1experimental_1_1bad__optional__access.html">bad_optional_access</a> : <span class="keyword">public</span> logic_error {</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>&#160; <span class="keyword">explicit</span> <a class="code" href="classstd_1_1experimental_1_1bad__optional__access.html">bad_optional_access</a>(<span class="keyword">const</span> <span class="keywordtype">string</span>&amp; what_arg) : logic_error{what_arg} {}</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>&#160; <span class="keyword">explicit</span> <a class="code" href="classstd_1_1experimental_1_1bad__optional__access.html">bad_optional_access</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* what_arg) : logic_error{what_arg} {}</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>&#160;};</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>&#160;</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span>&#160;</div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l00267"></a><span class="lineno"><a class="line" href="unionstd_1_1experimental_1_1storage__t.html"> 267</a></span>&#160;<span class="keyword">union </span><a class="code" href="unionstd_1_1experimental_1_1storage__t.html">storage_t</a></div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>&#160;{</div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span>&#160; <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> dummy_;</div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span>&#160; T value_;</div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>&#160;</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>&#160; constexpr <a class="code" href="unionstd_1_1experimental_1_1storage__t.html">storage_t</a>( <a class="code" href="structstd_1_1experimental_1_1trivial__init__t.html">trivial_init_t</a> ) noexcept : dummy_() {};</div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>&#160;</div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span>... Args&gt;</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span>&#160; constexpr <a class="code" href="unionstd_1_1experimental_1_1storage__t.html">storage_t</a>( Args&amp;&amp;... args ) : value_(constexpr_forward&lt;Args&gt;(args)...) {}</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>&#160;</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>&#160; ~storage_t(){}</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>&#160;};</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span>&#160;</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>&#160;</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l00282"></a><span class="lineno"><a class="line" href="unionstd_1_1experimental_1_1constexpr__storage__t.html"> 282</a></span>&#160;<span class="keyword">union </span><a class="code" href="unionstd_1_1experimental_1_1constexpr__storage__t.html">constexpr_storage_t</a></div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>&#160;{</div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>&#160; <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> dummy_;</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span>&#160; T value_;</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span>&#160;</div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>&#160; constexpr <a class="code" href="unionstd_1_1experimental_1_1constexpr__storage__t.html">constexpr_storage_t</a>( <a class="code" href="structstd_1_1experimental_1_1trivial__init__t.html">trivial_init_t</a> ) noexcept : dummy_() {};</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>&#160;</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span>... Args&gt;</div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>&#160; constexpr <a class="code" href="unionstd_1_1experimental_1_1constexpr__storage__t.html">constexpr_storage_t</a>( Args&amp;&amp;... args ) : value_(constexpr_forward&lt;Args&gt;(args)...) {}</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>&#160;</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>&#160; ~constexpr_storage_t() = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>&#160;};</div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>&#160;</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>&#160;</div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l00297"></a><span class="lineno"><a class="line" href="structstd_1_1experimental_1_1optional__base.html"> 297</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structstd_1_1experimental_1_1optional__base.html">optional_base</a></div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>&#160;{</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>&#160; <span class="keywordtype">bool</span> init_;</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>&#160; <a class="code" href="unionstd_1_1experimental_1_1storage__t.html">storage_t&lt;T&gt;</a> storage_;</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>&#160;</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>&#160; constexpr <a class="code" href="structstd_1_1experimental_1_1optional__base.html">optional_base</a>() noexcept : init_(<span class="keyword">false</span>), storage_(trivial_init) {};</div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span>&#160;</div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>&#160; <span class="keyword">explicit</span> constexpr <a class="code" href="structstd_1_1experimental_1_1optional__base.html">optional_base</a>(<span class="keyword">const</span> T&amp; v) : init_(<span class="keyword">true</span>), storage_(v) {}</div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span>&#160;</div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>&#160; <span class="keyword">explicit</span> constexpr optional_base(T&amp;&amp; v) : init_(<span class="keyword">true</span>), storage_(constexpr_move(v)) {}</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span>&#160;</div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span>... Args&gt; <span class="keyword">explicit</span> optional_base(<a class="code" href="structstd_1_1experimental_1_1in__place__t.html">in_place_t</a>, Args&amp;&amp;... args)</div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>&#160; : init_(<span class="keyword">true</span>), storage_(constexpr_forward&lt;Args&gt;(args)...) {}</div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span>&#160;</div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class </span>U, <span class="keyword">class</span>... Args, TR2_OPTIONAL_REQUIRES(is_constructible&lt;T, std::initializer_list&lt;U&gt;&gt;)&gt;</div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span>&#160; <span class="keyword">explicit</span> optional_base(<a class="code" href="structstd_1_1experimental_1_1in__place__t.html">in_place_t</a>, std::initializer_list&lt;U&gt; il, Args&amp;&amp;... args)</div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>&#160; : init_(<span class="keyword">true</span>), storage_(il, std::forward&lt;Args&gt;(args)...) {}</div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span>&#160;</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span>&#160; ~optional_base() { <span class="keywordflow">if</span> (init_) storage_.value_.T::~T(); }</div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span>&#160;};</div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span>&#160;</div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span>&#160;</div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l00320"></a><span class="lineno"><a class="line" href="structstd_1_1experimental_1_1constexpr__optional__base.html"> 320</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structstd_1_1experimental_1_1constexpr__optional__base.html">constexpr_optional_base</a></div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span>&#160;{</div><div class="line"><a name="l00322"></a><span class="lineno"> 322</span>&#160; <span class="keywordtype">bool</span> init_;</div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span>&#160; <a class="code" href="unionstd_1_1experimental_1_1constexpr__storage__t.html">constexpr_storage_t&lt;T&gt;</a> storage_;</div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span>&#160;</div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span>&#160; constexpr <a class="code" href="structstd_1_1experimental_1_1constexpr__optional__base.html">constexpr_optional_base</a>() noexcept : init_(<span class="keyword">false</span>), storage_(trivial_init) {};</div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span>&#160;</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span>&#160; <span class="keyword">explicit</span> constexpr <a class="code" href="structstd_1_1experimental_1_1constexpr__optional__base.html">constexpr_optional_base</a>(<span class="keyword">const</span> T&amp; v) : init_(<span class="keyword">true</span>), storage_(v) {}</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span>&#160;</div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span>&#160; <span class="keyword">explicit</span> constexpr constexpr_optional_base(T&amp;&amp; v) : init_(<span class="keyword">true</span>), storage_(constexpr_move(v)) {}</div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span>&#160;</div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span>... Args&gt; <span class="keyword">explicit</span> constexpr constexpr_optional_base(<a class="code" href="structstd_1_1experimental_1_1in__place__t.html">in_place_t</a>, Args&amp;&amp;... args)</div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span>&#160; : init_(<span class="keyword">true</span>), storage_(constexpr_forward&lt;Args&gt;(args)...) {}</div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span>&#160;</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class </span>U, <span class="keyword">class</span>... Args, TR2_OPTIONAL_REQUIRES(is_constructible&lt;T, std::initializer_list&lt;U&gt;&gt;)&gt;</div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span>&#160; OPTIONAL_CONSTEXPR_INIT_LIST <span class="keyword">explicit</span> constexpr_optional_base(<a class="code" href="structstd_1_1experimental_1_1in__place__t.html">in_place_t</a>, std::initializer_list&lt;U&gt; il, Args&amp;&amp;... args)</div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>&#160; : init_(<span class="keyword">true</span>), storage_(il, std::forward&lt;Args&gt;(args)...) {}</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>&#160;</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span>&#160; ~constexpr_optional_base() = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span>&#160;};</div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span>&#160;</div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span>&#160;<span class="keyword">using</span> OptionalBase = <span class="keyword">typename</span> std::conditional&lt;</div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span>&#160; is_trivially_destructible&lt;T&gt;::value,</div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span>&#160; <a class="code" href="structstd_1_1experimental_1_1constexpr__optional__base.html">constexpr_optional_base&lt;T&gt;</a>,</div><div class="line"><a name="l00345"></a><span class="lineno"> 345</span>&#160; <a class="code" href="structstd_1_1experimental_1_1optional__base.html">optional_base&lt;T&gt;</a></div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span>&#160;&gt;::type;</div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span>&#160;</div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span>&#160;</div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span>&#160;</div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span>&#160;<span class="keyword">class </span><a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a> : <span class="keyword">private</span> OptionalBase&lt;T&gt;</div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span>&#160;{</div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span>&#160; static_assert( !std::is_same&lt;<span class="keyword">typename</span> std::decay&lt;T&gt;::type, <a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>&gt;::value, <span class="stringliteral">&quot;bad T&quot;</span> );</div><div class="line"><a name="l00354"></a><span class="lineno"> 354</span>&#160; static_assert( !std::is_same&lt;<span class="keyword">typename</span> std::decay&lt;T&gt;::type, <a class="code" href="structstd_1_1experimental_1_1in__place__t.html">in_place_t</a>&gt;::value, <span class="stringliteral">&quot;bad T&quot;</span> );</div><div class="line"><a name="l00355"></a><span class="lineno"> 355</span>&#160;</div><div class="line"><a name="l00356"></a><span class="lineno"> 356</span>&#160;</div><div class="line"><a name="l00357"></a><span class="lineno"> 357</span>&#160; constexpr <span class="keywordtype">bool</span> initialized() <span class="keyword">const</span> noexcept { <span class="keywordflow">return</span> OptionalBase&lt;T&gt;::init_; }</div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span>&#160; T* dataptr() { <span class="keywordflow">return</span> std::addressof(OptionalBase&lt;T&gt;::storage_.value_); }</div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span>&#160; constexpr <span class="keyword">const</span> T* dataptr()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> detail_::static_addressof(OptionalBase&lt;T&gt;::storage_.value_); }</div><div class="line"><a name="l00360"></a><span class="lineno"> 360</span>&#160;</div><div class="line"><a name="l00361"></a><span class="lineno"> 361</span>&#160;<span class="preprocessor"># if OPTIONAL_HAS_THIS_RVALUE_REFS == 1</span></div><div class="line"><a name="l00362"></a><span class="lineno"> 362</span>&#160; constexpr <span class="keyword">const</span> T&amp; contained_val() <span class="keyword">const</span>&amp; { <span class="keywordflow">return</span> OptionalBase&lt;T&gt;::storage_.value_; }</div><div class="line"><a name="l00363"></a><span class="lineno"> 363</span>&#160;<span class="preprocessor"># if OPTIONAL_HAS_MOVE_ACCESSORS == 1</span></div><div class="line"><a name="l00364"></a><span class="lineno"> 364</span>&#160; OPTIONAL_MUTABLE_CONSTEXPR T&amp;&amp; contained_val() &amp;&amp; { <span class="keywordflow">return</span> std::move(OptionalBase&lt;T&gt;::storage_.value_); }</div><div class="line"><a name="l00365"></a><span class="lineno"> 365</span>&#160; OPTIONAL_MUTABLE_CONSTEXPR T&amp; contained_val() &amp; { <span class="keywordflow">return</span> OptionalBase&lt;T&gt;::storage_.value_; }</div><div class="line"><a name="l00366"></a><span class="lineno"> 366</span>&#160;<span class="preprocessor"># else</span></div><div class="line"><a name="l00367"></a><span class="lineno"> 367</span>&#160; T&amp; contained_val() &amp; { <span class="keywordflow">return</span> OptionalBase&lt;T&gt;::storage_.value_; }</div><div class="line"><a name="l00368"></a><span class="lineno"> 368</span>&#160; T&amp;&amp; contained_val() &amp;&amp; { <span class="keywordflow">return</span> std::move(OptionalBase&lt;T&gt;::storage_.value_); }</div><div class="line"><a name="l00369"></a><span class="lineno"> 369</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00370"></a><span class="lineno"> 370</span>&#160;<span class="preprocessor"># else</span></div><div class="line"><a name="l00371"></a><span class="lineno"> 371</span>&#160; constexpr <span class="keyword">const</span> T&amp; contained_val()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> OptionalBase&lt;T&gt;::storage_.value_; }</div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span>&#160; T&amp; contained_val() { <span class="keywordflow">return</span> OptionalBase&lt;T&gt;::storage_.value_; }</div><div class="line"><a name="l00373"></a><span class="lineno"> 373</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00374"></a><span class="lineno"> 374</span>&#160;</div><div class="line"><a name="l00375"></a><span class="lineno"> 375</span>&#160; <span class="keywordtype">void</span> clear() noexcept {</div><div class="line"><a name="l00376"></a><span class="lineno"> 376</span>&#160; <span class="keywordflow">if</span> (initialized()) dataptr()-&gt;T::~T();</div><div class="line"><a name="l00377"></a><span class="lineno"> 377</span>&#160; OptionalBase&lt;T&gt;::init_ = <span class="keyword">false</span>;</div><div class="line"><a name="l00378"></a><span class="lineno"> 378</span>&#160; }</div><div class="line"><a name="l00379"></a><span class="lineno"> 379</span>&#160;</div><div class="line"><a name="l00380"></a><span class="lineno"> 380</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span>... Args&gt;</div><div class="line"><a name="l00381"></a><span class="lineno"> 381</span>&#160; <span class="keywordtype">void</span> initialize(Args&amp;&amp;... args) noexcept(noexcept(T(std::forward&lt;Args&gt;(args)...)))</div><div class="line"><a name="l00382"></a><span class="lineno"> 382</span>&#160; {</div><div class="line"><a name="l00383"></a><span class="lineno"> 383</span>&#160; assert(!OptionalBase&lt;T&gt;::init_);</div><div class="line"><a name="l00384"></a><span class="lineno"> 384</span>&#160; ::new (static_cast&lt;void*&gt;(dataptr())) T(std::forward&lt;Args&gt;(args)...);</div><div class="line"><a name="l00385"></a><span class="lineno"> 385</span>&#160; OptionalBase&lt;T&gt;::init_ = <span class="keyword">true</span>;</div><div class="line"><a name="l00386"></a><span class="lineno"> 386</span>&#160; }</div><div class="line"><a name="l00387"></a><span class="lineno"> 387</span>&#160;</div><div class="line"><a name="l00388"></a><span class="lineno"> 388</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class </span>U, <span class="keyword">class</span>... Args&gt;</div><div class="line"><a name="l00389"></a><span class="lineno"> 389</span>&#160; <span class="keywordtype">void</span> initialize(std::initializer_list&lt;U&gt; il, Args&amp;&amp;... args) noexcept(noexcept(T(il, std::forward&lt;Args&gt;(args)...)))</div><div class="line"><a name="l00390"></a><span class="lineno"> 390</span>&#160; {</div><div class="line"><a name="l00391"></a><span class="lineno"> 391</span>&#160; assert(!OptionalBase&lt;T&gt;::init_);</div><div class="line"><a name="l00392"></a><span class="lineno"> 392</span>&#160; ::new (static_cast&lt;void*&gt;(dataptr())) T(il, std::forward&lt;Args&gt;(args)...);</div><div class="line"><a name="l00393"></a><span class="lineno"> 393</span>&#160; OptionalBase&lt;T&gt;::init_ = <span class="keyword">true</span>;</div><div class="line"><a name="l00394"></a><span class="lineno"> 394</span>&#160; }</div><div class="line"><a name="l00395"></a><span class="lineno"> 395</span>&#160;</div><div class="line"><a name="l00396"></a><span class="lineno"> 396</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00397"></a><span class="lineno"> 397</span>&#160; <span class="keyword">typedef</span> T value_type;</div><div class="line"><a name="l00398"></a><span class="lineno"> 398</span>&#160;</div><div class="line"><a name="l00399"></a><span class="lineno"> 399</span>&#160; <span class="comment">// 20.5.5.1, constructors</span></div><div class="line"><a name="l00400"></a><span class="lineno"> 400</span>&#160; constexpr <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>() noexcept : OptionalBase&lt;T&gt;() {};</div><div class="line"><a name="l00401"></a><span class="lineno"> 401</span>&#160; constexpr <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>(<a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>) noexcept : OptionalBase&lt;T&gt;() {};</div><div class="line"><a name="l00402"></a><span class="lineno"> 402</span>&#160;</div><div class="line"><a name="l00403"></a><span class="lineno"> 403</span>&#160; <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>&amp; rhs)</div><div class="line"><a name="l00404"></a><span class="lineno"> 404</span>&#160; : OptionalBase&lt;T&gt;()</div><div class="line"><a name="l00405"></a><span class="lineno"> 405</span>&#160; {</div><div class="line"><a name="l00406"></a><span class="lineno"> 406</span>&#160; <span class="keywordflow">if</span> (rhs.initialized()) {</div><div class="line"><a name="l00407"></a><span class="lineno"> 407</span>&#160; ::new (static_cast&lt;void*&gt;(dataptr())) T(*rhs);</div><div class="line"><a name="l00408"></a><span class="lineno"> 408</span>&#160; OptionalBase&lt;T&gt;::init_ = <span class="keyword">true</span>;</div><div class="line"><a name="l00409"></a><span class="lineno"> 409</span>&#160; }</div><div class="line"><a name="l00410"></a><span class="lineno"> 410</span>&#160; }</div><div class="line"><a name="l00411"></a><span class="lineno"> 411</span>&#160;</div><div class="line"><a name="l00412"></a><span class="lineno"> 412</span>&#160; <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>(<a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>&amp;&amp; rhs) noexcept(<a class="code" href="structstd_1_1experimental_1_1is__nothrow__move__constructible.html">is_nothrow_move_constructible&lt;T&gt;::value</a>)</div><div class="line"><a name="l00413"></a><span class="lineno"> 413</span>&#160; : OptionalBase&lt;T&gt;()</div><div class="line"><a name="l00414"></a><span class="lineno"> 414</span>&#160; {</div><div class="line"><a name="l00415"></a><span class="lineno"> 415</span>&#160; <span class="keywordflow">if</span> (rhs.initialized()) {</div><div class="line"><a name="l00416"></a><span class="lineno"> 416</span>&#160; ::new (static_cast&lt;void*&gt;(dataptr())) T(std::move(*rhs));</div><div class="line"><a name="l00417"></a><span class="lineno"> 417</span>&#160; OptionalBase&lt;T&gt;::init_ = <span class="keyword">true</span>;</div><div class="line"><a name="l00418"></a><span class="lineno"> 418</span>&#160; }</div><div class="line"><a name="l00419"></a><span class="lineno"> 419</span>&#160; }</div><div class="line"><a name="l00420"></a><span class="lineno"> 420</span>&#160;</div><div class="line"><a name="l00421"></a><span class="lineno"> 421</span>&#160; constexpr <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>(<span class="keyword">const</span> T&amp; v) : OptionalBase&lt;T&gt;(v) {}</div><div class="line"><a name="l00422"></a><span class="lineno"> 422</span>&#160;</div><div class="line"><a name="l00423"></a><span class="lineno"> 423</span>&#160; constexpr optional(T&amp;&amp; v) : OptionalBase&lt;T&gt;(constexpr_move(v)) {}</div><div class="line"><a name="l00424"></a><span class="lineno"> 424</span>&#160;</div><div class="line"><a name="l00425"></a><span class="lineno"> 425</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span>... Args&gt;</div><div class="line"><a name="l00426"></a><span class="lineno"> 426</span>&#160; <span class="keyword">explicit</span> constexpr optional(<a class="code" href="structstd_1_1experimental_1_1in__place__t.html">in_place_t</a>, Args&amp;&amp;... args)</div><div class="line"><a name="l00427"></a><span class="lineno"> 427</span>&#160; : OptionalBase&lt;T&gt;(<a class="code" href="structstd_1_1experimental_1_1in__place__t.html">in_place_t</a>{}, constexpr_forward&lt;Args&gt;(args)...) {}</div><div class="line"><a name="l00428"></a><span class="lineno"> 428</span>&#160;</div><div class="line"><a name="l00429"></a><span class="lineno"> 429</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class </span>U, <span class="keyword">class</span>... Args, TR2_OPTIONAL_REQUIRES(is_constructible&lt;T, std::initializer_list&lt;U&gt;&gt;)&gt;</div><div class="line"><a name="l00430"></a><span class="lineno"> 430</span>&#160; OPTIONAL_CONSTEXPR_INIT_LIST <span class="keyword">explicit</span> optional(<a class="code" href="structstd_1_1experimental_1_1in__place__t.html">in_place_t</a>, std::initializer_list&lt;U&gt; il, Args&amp;&amp;... args)</div><div class="line"><a name="l00431"></a><span class="lineno"> 431</span>&#160; : OptionalBase&lt;T&gt;(<a class="code" href="structstd_1_1experimental_1_1in__place__t.html">in_place_t</a>{}, il, constexpr_forward&lt;Args&gt;(args)...) {}</div><div class="line"><a name="l00432"></a><span class="lineno"> 432</span>&#160;</div><div class="line"><a name="l00433"></a><span class="lineno"> 433</span>&#160; <span class="comment">// 20.5.4.2, Destructor</span></div><div class="line"><a name="l00434"></a><span class="lineno"> 434</span>&#160; ~optional() = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00435"></a><span class="lineno"> 435</span>&#160;</div><div class="line"><a name="l00436"></a><span class="lineno"> 436</span>&#160; <span class="comment">// 20.5.4.3, assignment</span></div><div class="line"><a name="l00437"></a><span class="lineno"> 437</span>&#160; optional&amp; operator=(<a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>) noexcept</div><div class="line"><a name="l00438"></a><span class="lineno"> 438</span>&#160; {</div><div class="line"><a name="l00439"></a><span class="lineno"> 439</span>&#160; clear();</div><div class="line"><a name="l00440"></a><span class="lineno"> 440</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00441"></a><span class="lineno"> 441</span>&#160; }</div><div class="line"><a name="l00442"></a><span class="lineno"> 442</span>&#160;</div><div class="line"><a name="l00443"></a><span class="lineno"> 443</span>&#160; optional&amp; operator=(<span class="keyword">const</span> optional&amp; rhs)</div><div class="line"><a name="l00444"></a><span class="lineno"> 444</span>&#160; {</div><div class="line"><a name="l00445"></a><span class="lineno"> 445</span>&#160; <span class="keywordflow">if</span> (initialized() == <span class="keyword">true</span> &amp;&amp; rhs.initialized() == <span class="keyword">false</span>) clear();</div><div class="line"><a name="l00446"></a><span class="lineno"> 446</span>&#160; <span class="keywordflow">else</span> <span class="keywordflow">if</span> (initialized() == <span class="keyword">false</span> &amp;&amp; rhs.initialized() == <span class="keyword">true</span>) initialize(*rhs);</div><div class="line"><a name="l00447"></a><span class="lineno"> 447</span>&#160; <span class="keywordflow">else</span> <span class="keywordflow">if</span> (initialized() == <span class="keyword">true</span> &amp;&amp; rhs.initialized() == <span class="keyword">true</span>) contained_val() = *rhs;</div><div class="line"><a name="l00448"></a><span class="lineno"> 448</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00449"></a><span class="lineno"> 449</span>&#160; }</div><div class="line"><a name="l00450"></a><span class="lineno"> 450</span>&#160;</div><div class="line"><a name="l00451"></a><span class="lineno"> 451</span>&#160; optional&amp; operator=(optional&amp;&amp; rhs)</div><div class="line"><a name="l00452"></a><span class="lineno"> 452</span>&#160; noexcept(<a class="code" href="structstd_1_1experimental_1_1is__nothrow__move__assignable.html">is_nothrow_move_assignable&lt;T&gt;::value</a> &amp;&amp; <a class="code" href="structstd_1_1experimental_1_1is__nothrow__move__constructible.html">is_nothrow_move_constructible&lt;T&gt;::value</a>)</div><div class="line"><a name="l00453"></a><span class="lineno"> 453</span>&#160; {</div><div class="line"><a name="l00454"></a><span class="lineno"> 454</span>&#160; <span class="keywordflow">if</span> (initialized() == <span class="keyword">true</span> &amp;&amp; rhs.initialized() == <span class="keyword">false</span>) clear();</div><div class="line"><a name="l00455"></a><span class="lineno"> 455</span>&#160; <span class="keywordflow">else</span> <span class="keywordflow">if</span> (initialized() == <span class="keyword">false</span> &amp;&amp; rhs.initialized() == <span class="keyword">true</span>) initialize(std::move(*rhs));</div><div class="line"><a name="l00456"></a><span class="lineno"> 456</span>&#160; <span class="keywordflow">else</span> <span class="keywordflow">if</span> (initialized() == <span class="keyword">true</span> &amp;&amp; rhs.initialized() == <span class="keyword">true</span>) contained_val() = std::move(*rhs);</div><div class="line"><a name="l00457"></a><span class="lineno"> 457</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00458"></a><span class="lineno"> 458</span>&#160; }</div><div class="line"><a name="l00459"></a><span class="lineno"> 459</span>&#160;</div><div class="line"><a name="l00460"></a><span class="lineno"> 460</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span> U&gt;</div><div class="line"><a name="l00461"></a><span class="lineno"> 461</span>&#160; <span class="keyword">auto</span> operator=(U&amp;&amp; v)</div><div class="line"><a name="l00462"></a><span class="lineno"> 462</span>&#160; -&gt; <span class="keyword">typename</span> enable_if</div><div class="line"><a name="l00463"></a><span class="lineno"> 463</span>&#160; &lt;</div><div class="line"><a name="l00464"></a><span class="lineno"> 464</span>&#160; is_same&lt;typename decay&lt;U&gt;::type, T&gt;::value,</div><div class="line"><a name="l00465"></a><span class="lineno"> 465</span>&#160; optional&amp;</div><div class="line"><a name="l00466"></a><span class="lineno"> 466</span>&#160; &gt;::type</div><div class="line"><a name="l00467"></a><span class="lineno"> 467</span>&#160; {</div><div class="line"><a name="l00468"></a><span class="lineno"> 468</span>&#160; <span class="keywordflow">if</span> (initialized()) { contained_val() = std::forward&lt;U&gt;(v); }</div><div class="line"><a name="l00469"></a><span class="lineno"> 469</span>&#160; <span class="keywordflow">else</span> { initialize(std::forward&lt;U&gt;(v)); }</div><div class="line"><a name="l00470"></a><span class="lineno"> 470</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00471"></a><span class="lineno"> 471</span>&#160; }</div><div class="line"><a name="l00472"></a><span class="lineno"> 472</span>&#160;</div><div class="line"><a name="l00473"></a><span class="lineno"> 473</span>&#160;</div><div class="line"><a name="l00474"></a><span class="lineno"> 474</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span>... Args&gt;</div><div class="line"><a name="l00475"></a><span class="lineno"> 475</span>&#160; <span class="keywordtype">void</span> emplace(Args&amp;&amp;... args)</div><div class="line"><a name="l00476"></a><span class="lineno"> 476</span>&#160; {</div><div class="line"><a name="l00477"></a><span class="lineno"> 477</span>&#160; clear();</div><div class="line"><a name="l00478"></a><span class="lineno"> 478</span>&#160; initialize(std::forward&lt;Args&gt;(args)...);</div><div class="line"><a name="l00479"></a><span class="lineno"> 479</span>&#160; }</div><div class="line"><a name="l00480"></a><span class="lineno"> 480</span>&#160;</div><div class="line"><a name="l00481"></a><span class="lineno"> 481</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class </span>U, <span class="keyword">class</span>... Args&gt;</div><div class="line"><a name="l00482"></a><span class="lineno"> 482</span>&#160; <span class="keywordtype">void</span> emplace(initializer_list&lt;U&gt; il, Args&amp;&amp;... args)</div><div class="line"><a name="l00483"></a><span class="lineno"> 483</span>&#160; {</div><div class="line"><a name="l00484"></a><span class="lineno"> 484</span>&#160; clear();</div><div class="line"><a name="l00485"></a><span class="lineno"> 485</span>&#160; initialize&lt;U, Args...&gt;(il, std::forward&lt;Args&gt;(args)...);</div><div class="line"><a name="l00486"></a><span class="lineno"> 486</span>&#160; }</div><div class="line"><a name="l00487"></a><span class="lineno"> 487</span>&#160;</div><div class="line"><a name="l00488"></a><span class="lineno"> 488</span>&#160; <span class="comment">// 20.5.4.4, Swap</span></div><div class="line"><a name="l00489"></a><span class="lineno"> 489</span>&#160; <span class="keywordtype">void</span> swap(<a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; rhs) noexcept(<a class="code" href="structstd_1_1experimental_1_1is__nothrow__move__constructible.html">is_nothrow_move_constructible&lt;T&gt;::value</a> &amp;&amp; noexcept(swap(declval&lt;T&amp;&gt;(), declval&lt;T&amp;&gt;())))</div><div class="line"><a name="l00490"></a><span class="lineno"> 490</span>&#160; {</div><div class="line"><a name="l00491"></a><span class="lineno"> 491</span>&#160; <span class="keywordflow">if</span> (initialized() == <span class="keyword">true</span> &amp;&amp; rhs.initialized() == <span class="keyword">false</span>) { rhs.initialize(std::move(**<span class="keyword">this</span>)); clear(); }</div><div class="line"><a name="l00492"></a><span class="lineno"> 492</span>&#160; <span class="keywordflow">else</span> <span class="keywordflow">if</span> (initialized() == <span class="keyword">false</span> &amp;&amp; rhs.initialized() == <span class="keyword">true</span>) { initialize(std::move(*rhs)); rhs.clear(); }</div><div class="line"><a name="l00493"></a><span class="lineno"> 493</span>&#160; <span class="keywordflow">else</span> <span class="keywordflow">if</span> (initialized() == <span class="keyword">true</span> &amp;&amp; rhs.initialized() == <span class="keyword">true</span>) { <span class="keyword">using</span> std::swap; swap(**<span class="keyword">this</span>, *rhs); }</div><div class="line"><a name="l00494"></a><span class="lineno"> 494</span>&#160; }</div><div class="line"><a name="l00495"></a><span class="lineno"> 495</span>&#160;</div><div class="line"><a name="l00496"></a><span class="lineno"> 496</span>&#160; <span class="comment">// 20.5.4.5, Observers</span></div><div class="line"><a name="l00497"></a><span class="lineno"> 497</span>&#160;</div><div class="line"><a name="l00498"></a><span class="lineno"> 498</span>&#160; <span class="keyword">explicit</span> constexpr <span class="keyword">operator</span> bool() <span class="keyword">const</span> noexcept { <span class="keywordflow">return</span> initialized(); }</div><div class="line"><a name="l00499"></a><span class="lineno"> 499</span>&#160;</div><div class="line"><a name="l00500"></a><span class="lineno"> 500</span>&#160; constexpr T <span class="keyword">const</span>* operator -&gt;()<span class="keyword"> const </span>{</div><div class="line"><a name="l00501"></a><span class="lineno"> 501</span>&#160; <span class="keywordflow">return</span> TR2_OPTIONAL_ASSERTED_EXPRESSION(initialized(), dataptr());</div><div class="line"><a name="l00502"></a><span class="lineno"> 502</span>&#160; }</div><div class="line"><a name="l00503"></a><span class="lineno"> 503</span>&#160;</div><div class="line"><a name="l00504"></a><span class="lineno"> 504</span>&#160;<span class="preprocessor"># if OPTIONAL_HAS_MOVE_ACCESSORS == 1</span></div><div class="line"><a name="l00505"></a><span class="lineno"> 505</span>&#160;</div><div class="line"><a name="l00506"></a><span class="lineno"> 506</span>&#160; OPTIONAL_MUTABLE_CONSTEXPR T* operator -&gt;() {</div><div class="line"><a name="l00507"></a><span class="lineno"> 507</span>&#160; assert (initialized());</div><div class="line"><a name="l00508"></a><span class="lineno"> 508</span>&#160; <span class="keywordflow">return</span> dataptr();</div><div class="line"><a name="l00509"></a><span class="lineno"> 509</span>&#160; }</div><div class="line"><a name="l00510"></a><span class="lineno"> 510</span>&#160;</div><div class="line"><a name="l00511"></a><span class="lineno"> 511</span>&#160; constexpr T <span class="keyword">const</span>&amp; operator *() <span class="keyword">const</span>&amp; {</div><div class="line"><a name="l00512"></a><span class="lineno"> 512</span>&#160; <span class="keywordflow">return</span> TR2_OPTIONAL_ASSERTED_EXPRESSION(initialized(), contained_val());</div><div class="line"><a name="l00513"></a><span class="lineno"> 513</span>&#160; }</div><div class="line"><a name="l00514"></a><span class="lineno"> 514</span>&#160;</div><div class="line"><a name="l00515"></a><span class="lineno"> 515</span>&#160; OPTIONAL_MUTABLE_CONSTEXPR T&amp; operator *() &amp; {</div><div class="line"><a name="l00516"></a><span class="lineno"> 516</span>&#160; assert (initialized());</div><div class="line"><a name="l00517"></a><span class="lineno"> 517</span>&#160; <span class="keywordflow">return</span> contained_val();</div><div class="line"><a name="l00518"></a><span class="lineno"> 518</span>&#160; }</div><div class="line"><a name="l00519"></a><span class="lineno"> 519</span>&#160;</div><div class="line"><a name="l00520"></a><span class="lineno"> 520</span>&#160; OPTIONAL_MUTABLE_CONSTEXPR T&amp;&amp; operator *() &amp;&amp; {</div><div class="line"><a name="l00521"></a><span class="lineno"> 521</span>&#160; assert (initialized());</div><div class="line"><a name="l00522"></a><span class="lineno"> 522</span>&#160; <span class="keywordflow">return</span> constexpr_move(contained_val());</div><div class="line"><a name="l00523"></a><span class="lineno"> 523</span>&#160; }</div><div class="line"><a name="l00524"></a><span class="lineno"> 524</span>&#160;</div><div class="line"><a name="l00525"></a><span class="lineno"> 525</span>&#160; constexpr T <span class="keyword">const</span>&amp; value() <span class="keyword">const</span>&amp; {</div><div class="line"><a name="l00526"></a><span class="lineno"> 526</span>&#160; <span class="keywordflow">if</span> (!initialized()) atFatal(<span class="stringliteral">&quot;bad optional access&quot;</span>);</div><div class="line"><a name="l00527"></a><span class="lineno"> 527</span>&#160; <span class="keywordflow">return</span> contained_val();</div><div class="line"><a name="l00528"></a><span class="lineno"> 528</span>&#160; }</div><div class="line"><a name="l00529"></a><span class="lineno"> 529</span>&#160;</div><div class="line"><a name="l00530"></a><span class="lineno"> 530</span>&#160; OPTIONAL_MUTABLE_CONSTEXPR T&amp; value() &amp; {</div><div class="line"><a name="l00531"></a><span class="lineno"> 531</span>&#160; <span class="keywordflow">if</span> (!initialized()) atFatal(<span class="stringliteral">&quot;bad optional access&quot;</span>);</div><div class="line"><a name="l00532"></a><span class="lineno"> 532</span>&#160; <span class="keywordflow">return</span> contained_val();</div><div class="line"><a name="l00533"></a><span class="lineno"> 533</span>&#160; }</div><div class="line"><a name="l00534"></a><span class="lineno"> 534</span>&#160;</div><div class="line"><a name="l00535"></a><span class="lineno"> 535</span>&#160; OPTIONAL_MUTABLE_CONSTEXPR T&amp;&amp; value() &amp;&amp; {</div><div class="line"><a name="l00536"></a><span class="lineno"> 536</span>&#160; <span class="keywordflow">if</span> (!initialized()) atFatal(<span class="stringliteral">&quot;bad optional access&quot;</span>);</div><div class="line"><a name="l00537"></a><span class="lineno"> 537</span>&#160; <span class="keywordflow">return</span> std::move(contained_val());</div><div class="line"><a name="l00538"></a><span class="lineno"> 538</span>&#160; }</div><div class="line"><a name="l00539"></a><span class="lineno"> 539</span>&#160;</div><div class="line"><a name="l00540"></a><span class="lineno"> 540</span>&#160;<span class="preprocessor"># else</span></div><div class="line"><a name="l00541"></a><span class="lineno"> 541</span>&#160;</div><div class="line"><a name="l00542"></a><span class="lineno"> 542</span>&#160; T* operator -&gt;() {</div><div class="line"><a name="l00543"></a><span class="lineno"> 543</span>&#160; assert (initialized());</div><div class="line"><a name="l00544"></a><span class="lineno"> 544</span>&#160; <span class="keywordflow">return</span> dataptr();</div><div class="line"><a name="l00545"></a><span class="lineno"> 545</span>&#160; }</div><div class="line"><a name="l00546"></a><span class="lineno"> 546</span>&#160;</div><div class="line"><a name="l00547"></a><span class="lineno"> 547</span>&#160; constexpr T <span class="keyword">const</span>&amp; operator *()<span class="keyword"> const </span>{</div><div class="line"><a name="l00548"></a><span class="lineno"> 548</span>&#160; <span class="keywordflow">return</span> TR2_OPTIONAL_ASSERTED_EXPRESSION(initialized(), contained_val());</div><div class="line"><a name="l00549"></a><span class="lineno"> 549</span>&#160; }</div><div class="line"><a name="l00550"></a><span class="lineno"> 550</span>&#160;</div><div class="line"><a name="l00551"></a><span class="lineno"> 551</span>&#160; T&amp; operator *() {</div><div class="line"><a name="l00552"></a><span class="lineno"> 552</span>&#160; assert (initialized());</div><div class="line"><a name="l00553"></a><span class="lineno"> 553</span>&#160; <span class="keywordflow">return</span> contained_val();</div><div class="line"><a name="l00554"></a><span class="lineno"> 554</span>&#160; }</div><div class="line"><a name="l00555"></a><span class="lineno"> 555</span>&#160;</div><div class="line"><a name="l00556"></a><span class="lineno"> 556</span>&#160; constexpr T <span class="keyword">const</span>&amp; value()<span class="keyword"> const </span>{</div><div class="line"><a name="l00557"></a><span class="lineno"> 557</span>&#160; <span class="keywordflow">if</span> (!initialized())</div><div class="line"><a name="l00558"></a><span class="lineno"> 558</span>&#160; atFatal(<span class="stringliteral">&quot;bad optional access&quot;</span>);</div><div class="line"><a name="l00559"></a><span class="lineno"> 559</span>&#160; <span class="keywordflow">return</span> contained_val();</div><div class="line"><a name="l00560"></a><span class="lineno"> 560</span>&#160; }</div><div class="line"><a name="l00561"></a><span class="lineno"> 561</span>&#160;</div><div class="line"><a name="l00562"></a><span class="lineno"> 562</span>&#160; T&amp; value() {</div><div class="line"><a name="l00563"></a><span class="lineno"> 563</span>&#160; <span class="keywordflow">if</span> (!initialized())</div><div class="line"><a name="l00564"></a><span class="lineno"> 564</span>&#160; atFatal(<span class="stringliteral">&quot;bad optional access&quot;</span>);</div><div class="line"><a name="l00565"></a><span class="lineno"> 565</span>&#160; <span class="keywordflow">return</span> contained_val();</div><div class="line"><a name="l00566"></a><span class="lineno"> 566</span>&#160; }</div><div class="line"><a name="l00567"></a><span class="lineno"> 567</span>&#160;</div><div class="line"><a name="l00568"></a><span class="lineno"> 568</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00569"></a><span class="lineno"> 569</span>&#160;</div><div class="line"><a name="l00570"></a><span class="lineno"> 570</span>&#160;<span class="preprocessor"># if OPTIONAL_HAS_THIS_RVALUE_REFS == 1</span></div><div class="line"><a name="l00571"></a><span class="lineno"> 571</span>&#160;</div><div class="line"><a name="l00572"></a><span class="lineno"> 572</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span> V&gt;</div><div class="line"><a name="l00573"></a><span class="lineno"> 573</span>&#160; constexpr T value_or(V&amp;&amp; v) <span class="keyword">const</span>&amp;</div><div class="line"><a name="l00574"></a><span class="lineno"> 574</span>&#160; {</div><div class="line"><a name="l00575"></a><span class="lineno"> 575</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span> ? **<span class="keyword">this</span> : detail_::convert&lt;T&gt;(constexpr_forward&lt;V&gt;(v));</div><div class="line"><a name="l00576"></a><span class="lineno"> 576</span>&#160; }</div><div class="line"><a name="l00577"></a><span class="lineno"> 577</span>&#160;</div><div class="line"><a name="l00578"></a><span class="lineno"> 578</span>&#160;<span class="preprocessor"># if OPTIONAL_HAS_MOVE_ACCESSORS == 1</span></div><div class="line"><a name="l00579"></a><span class="lineno"> 579</span>&#160;</div><div class="line"><a name="l00580"></a><span class="lineno"> 580</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span> V&gt;</div><div class="line"><a name="l00581"></a><span class="lineno"> 581</span>&#160; OPTIONAL_MUTABLE_CONSTEXPR T value_or(V&amp;&amp; v) &amp;&amp;</div><div class="line"><a name="l00582"></a><span class="lineno"> 582</span>&#160; {</div><div class="line"><a name="l00583"></a><span class="lineno"> 583</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span> ? constexpr_move(<span class="keyword">const_cast&lt;</span><a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp;<span class="keyword">&gt;</span>(*this).contained_val()) : detail_::convert&lt;T&gt;(constexpr_forward&lt;V&gt;(v));</div><div class="line"><a name="l00584"></a><span class="lineno"> 584</span>&#160; }</div><div class="line"><a name="l00585"></a><span class="lineno"> 585</span>&#160;</div><div class="line"><a name="l00586"></a><span class="lineno"> 586</span>&#160;<span class="preprocessor"># else</span></div><div class="line"><a name="l00587"></a><span class="lineno"> 587</span>&#160;</div><div class="line"><a name="l00588"></a><span class="lineno"> 588</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span> V&gt;</div><div class="line"><a name="l00589"></a><span class="lineno"> 589</span>&#160; T value_or(V&amp;&amp; v) &amp;&amp;</div><div class="line"><a name="l00590"></a><span class="lineno"> 590</span>&#160; {</div><div class="line"><a name="l00591"></a><span class="lineno"> 591</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span> ? constexpr_move(<span class="keyword">const_cast&lt;</span><a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp;<span class="keyword">&gt;</span>(*this).contained_val()) : detail_::convert&lt;T&gt;(constexpr_forward&lt;V&gt;(v));</div><div class="line"><a name="l00592"></a><span class="lineno"> 592</span>&#160; }</div><div class="line"><a name="l00593"></a><span class="lineno"> 593</span>&#160;</div><div class="line"><a name="l00594"></a><span class="lineno"> 594</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00595"></a><span class="lineno"> 595</span>&#160;</div><div class="line"><a name="l00596"></a><span class="lineno"> 596</span>&#160;<span class="preprocessor"># else</span></div><div class="line"><a name="l00597"></a><span class="lineno"> 597</span>&#160;</div><div class="line"><a name="l00598"></a><span class="lineno"> 598</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span> V&gt;</div><div class="line"><a name="l00599"></a><span class="lineno"> 599</span>&#160; constexpr T value_or(V&amp;&amp; v)<span class="keyword"> const</span></div><div class="line"><a name="l00600"></a><span class="lineno"> 600</span>&#160;<span class="keyword"> </span>{</div><div class="line"><a name="l00601"></a><span class="lineno"> 601</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span> ? **<span class="keyword">this</span> : detail_::convert&lt;T&gt;(constexpr_forward&lt;V&gt;(v));</div><div class="line"><a name="l00602"></a><span class="lineno"> 602</span>&#160; }</div><div class="line"><a name="l00603"></a><span class="lineno"> 603</span>&#160;</div><div class="line"><a name="l00604"></a><span class="lineno"> 604</span>&#160;<span class="preprocessor"># endif</span></div><div class="line"><a name="l00605"></a><span class="lineno"> 605</span>&#160;</div><div class="line"><a name="l00606"></a><span class="lineno"> 606</span>&#160;};</div><div class="line"><a name="l00607"></a><span class="lineno"> 607</span>&#160;</div><div class="line"><a name="l00608"></a><span class="lineno"> 608</span>&#160;</div><div class="line"><a name="l00609"></a><span class="lineno"> 609</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l00610"></a><span class="lineno"><a class="line" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html"> 610</a></span>&#160;<span class="keyword">class </span><a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>&lt;T&amp;&gt;</div><div class="line"><a name="l00611"></a><span class="lineno"> 611</span>&#160;{</div><div class="line"><a name="l00612"></a><span class="lineno"> 612</span>&#160; static_assert( !std::is_same&lt;T, nullopt_t&gt;::value, <span class="stringliteral">&quot;bad T&quot;</span> );</div><div class="line"><a name="l00613"></a><span class="lineno"> 613</span>&#160; static_assert( !std::is_same&lt;T, in_place_t&gt;::value, <span class="stringliteral">&quot;bad T&quot;</span> );</div><div class="line"><a name="l00614"></a><span class="lineno"> 614</span>&#160; T* ref;</div><div class="line"><a name="l00615"></a><span class="lineno"> 615</span>&#160;</div><div class="line"><a name="l00616"></a><span class="lineno"> 616</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00617"></a><span class="lineno"> 617</span>&#160;</div><div class="line"><a name="l00618"></a><span class="lineno"> 618</span>&#160; <span class="comment">// 20.5.5.1, construction/destruction</span></div><div class="line"><a name="l00619"></a><span class="lineno"> 619</span>&#160; constexpr <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>() noexcept : ref(<span class="keyword">nullptr</span>) {}</div><div class="line"><a name="l00620"></a><span class="lineno"> 620</span>&#160;</div><div class="line"><a name="l00621"></a><span class="lineno"> 621</span>&#160; constexpr <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>(<a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>) noexcept : ref(<span class="keyword">nullptr</span>) {}</div><div class="line"><a name="l00622"></a><span class="lineno"> 622</span>&#160;</div><div class="line"><a name="l00623"></a><span class="lineno"> 623</span>&#160; constexpr <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>(T&amp; v) noexcept : ref(detail_::static_addressof(v)) {}</div><div class="line"><a name="l00624"></a><span class="lineno"> 624</span>&#160;</div><div class="line"><a name="l00625"></a><span class="lineno"> 625</span>&#160; <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>(T&amp;&amp;) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00626"></a><span class="lineno"> 626</span>&#160;</div><div class="line"><a name="l00627"></a><span class="lineno"> 627</span>&#160; constexpr <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>&amp; rhs) noexcept : ref(rhs.ref) {}</div><div class="line"><a name="l00628"></a><span class="lineno"> 628</span>&#160;</div><div class="line"><a name="l00629"></a><span class="lineno"> 629</span>&#160; <span class="keyword">explicit</span> constexpr <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>(<a class="code" href="structstd_1_1experimental_1_1in__place__t.html">in_place_t</a>, T&amp; v) noexcept : ref(detail_::static_addressof(v)) {}</div><div class="line"><a name="l00630"></a><span class="lineno"> 630</span>&#160;</div><div class="line"><a name="l00631"></a><span class="lineno"> 631</span>&#160; <span class="keyword">explicit</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>(<a class="code" href="structstd_1_1experimental_1_1in__place__t.html">in_place_t</a>, T&amp;&amp;) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00632"></a><span class="lineno"> 632</span>&#160;</div><div class="line"><a name="l00633"></a><span class="lineno"> 633</span>&#160; ~<a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>() = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00634"></a><span class="lineno"> 634</span>&#160;</div><div class="line"><a name="l00635"></a><span class="lineno"> 635</span>&#160; <span class="comment">// 20.5.5.2, mutation</span></div><div class="line"><a name="l00636"></a><span class="lineno"> 636</span>&#160; <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>&amp; operator=(<a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>) noexcept {</div><div class="line"><a name="l00637"></a><span class="lineno"> 637</span>&#160; ref = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00638"></a><span class="lineno"> 638</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00639"></a><span class="lineno"> 639</span>&#160; }</div><div class="line"><a name="l00640"></a><span class="lineno"> 640</span>&#160;</div><div class="line"><a name="l00641"></a><span class="lineno"> 641</span>&#160; <span class="comment">// optional&amp; operator=(const optional&amp; rhs) noexcept {</span></div><div class="line"><a name="l00642"></a><span class="lineno"> 642</span>&#160; <span class="comment">// ref = rhs.ref;</span></div><div class="line"><a name="l00643"></a><span class="lineno"> 643</span>&#160; <span class="comment">// return *this;</span></div><div class="line"><a name="l00644"></a><span class="lineno"> 644</span>&#160; <span class="comment">// }</span></div><div class="line"><a name="l00645"></a><span class="lineno"> 645</span>&#160;</div><div class="line"><a name="l00646"></a><span class="lineno"> 646</span>&#160; <span class="comment">// optional&amp; operator=(optional&amp;&amp; rhs) noexcept {</span></div><div class="line"><a name="l00647"></a><span class="lineno"> 647</span>&#160; <span class="comment">// ref = rhs.ref;</span></div><div class="line"><a name="l00648"></a><span class="lineno"> 648</span>&#160; <span class="comment">// return *this;</span></div><div class="line"><a name="l00649"></a><span class="lineno"> 649</span>&#160; <span class="comment">// }</span></div><div class="line"><a name="l00650"></a><span class="lineno"> 650</span>&#160;</div><div class="line"><a name="l00651"></a><span class="lineno"> 651</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">typename</span> U&gt;</div><div class="line"><a name="l00652"></a><span class="lineno"> 652</span>&#160; <span class="keyword">auto</span> operator=(U&amp;&amp; rhs) noexcept</div><div class="line"><a name="l00653"></a><span class="lineno"> 653</span>&#160; -&gt; <span class="keyword">typename</span> enable_if</div><div class="line"><a name="l00654"></a><span class="lineno"> 654</span>&#160; &lt;</div><div class="line"><a name="l00655"></a><span class="lineno"> 655</span>&#160; is_same&lt;typename decay&lt;U&gt;::type, <a class="code" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">optional&lt;T&amp;&gt;</a>&gt;::value,</div><div class="line"><a name="l00656"></a><span class="lineno"> 656</span>&#160; <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>&amp;</div><div class="line"><a name="l00657"></a><span class="lineno"> 657</span>&#160; &gt;::type</div><div class="line"><a name="l00658"></a><span class="lineno"> 658</span>&#160; {</div><div class="line"><a name="l00659"></a><span class="lineno"> 659</span>&#160; ref = rhs.ref;</div><div class="line"><a name="l00660"></a><span class="lineno"> 660</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00661"></a><span class="lineno"> 661</span>&#160; }</div><div class="line"><a name="l00662"></a><span class="lineno"> 662</span>&#160;</div><div class="line"><a name="l00663"></a><span class="lineno"> 663</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">typename</span> U&gt;</div><div class="line"><a name="l00664"></a><span class="lineno"> 664</span>&#160; <span class="keyword">auto</span> operator=(U&amp;&amp; rhs) noexcept</div><div class="line"><a name="l00665"></a><span class="lineno"> 665</span>&#160; -&gt; <span class="keyword">typename</span> enable_if</div><div class="line"><a name="l00666"></a><span class="lineno"> 666</span>&#160; &lt;</div><div class="line"><a name="l00667"></a><span class="lineno"> 667</span>&#160; !is_same&lt;typename decay&lt;U&gt;::type, <a class="code" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">optional&lt;T&amp;&gt;</a>&gt;::value,</div><div class="line"><a name="l00668"></a><span class="lineno"> 668</span>&#160; <a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>&amp;</div><div class="line"><a name="l00669"></a><span class="lineno"> 669</span>&#160; &gt;::type</div><div class="line"><a name="l00670"></a><span class="lineno"> 670</span>&#160; = <span class="keyword">delete</span>;</div><div class="line"><a name="l00671"></a><span class="lineno"> 671</span>&#160;</div><div class="line"><a name="l00672"></a><span class="lineno"> 672</span>&#160; <span class="keywordtype">void</span> emplace(T&amp; v) noexcept {</div><div class="line"><a name="l00673"></a><span class="lineno"> 673</span>&#160; ref = detail_::static_addressof(v);</div><div class="line"><a name="l00674"></a><span class="lineno"> 674</span>&#160; }</div><div class="line"><a name="l00675"></a><span class="lineno"> 675</span>&#160;</div><div class="line"><a name="l00676"></a><span class="lineno"> 676</span>&#160; <span class="keywordtype">void</span> emplace(T&amp;&amp;) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00677"></a><span class="lineno"> 677</span>&#160;</div><div class="line"><a name="l00678"></a><span class="lineno"> 678</span>&#160;</div><div class="line"><a name="l00679"></a><span class="lineno"> 679</span>&#160; <span class="keywordtype">void</span> swap(<a class="code" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">optional&lt;T&amp;&gt;</a>&amp; rhs) noexcept</div><div class="line"><a name="l00680"></a><span class="lineno"> 680</span>&#160; {</div><div class="line"><a name="l00681"></a><span class="lineno"> 681</span>&#160; std::swap(ref, rhs.ref);</div><div class="line"><a name="l00682"></a><span class="lineno"> 682</span>&#160; }</div><div class="line"><a name="l00683"></a><span class="lineno"> 683</span>&#160;</div><div class="line"><a name="l00684"></a><span class="lineno"> 684</span>&#160; <span class="comment">// 20.5.5.3, observers</span></div><div class="line"><a name="l00685"></a><span class="lineno"> 685</span>&#160; constexpr T* operator-&gt;()<span class="keyword"> const </span>{</div><div class="line"><a name="l00686"></a><span class="lineno"> 686</span>&#160; <span class="keywordflow">return</span> TR2_OPTIONAL_ASSERTED_EXPRESSION(ref, ref);</div><div class="line"><a name="l00687"></a><span class="lineno"> 687</span>&#160; }</div><div class="line"><a name="l00688"></a><span class="lineno"> 688</span>&#160;</div><div class="line"><a name="l00689"></a><span class="lineno"> 689</span>&#160; constexpr T&amp; operator*()<span class="keyword"> const </span>{</div><div class="line"><a name="l00690"></a><span class="lineno"> 690</span>&#160; <span class="keywordflow">return</span> TR2_OPTIONAL_ASSERTED_EXPRESSION(ref, *ref);</div><div class="line"><a name="l00691"></a><span class="lineno"> 691</span>&#160; }</div><div class="line"><a name="l00692"></a><span class="lineno"> 692</span>&#160;</div><div class="line"><a name="l00693"></a><span class="lineno"> 693</span>&#160; constexpr T&amp; value()<span class="keyword"> const </span>{</div><div class="line"><a name="l00694"></a><span class="lineno"> 694</span>&#160; <span class="keywordflow">if</span> (!ref) atFatal(<span class="stringliteral">&quot;bad optional access&quot;</span>);</div><div class="line"><a name="l00695"></a><span class="lineno"> 695</span>&#160; <span class="keywordflow">return</span> *ref;</div><div class="line"><a name="l00696"></a><span class="lineno"> 696</span>&#160; }</div><div class="line"><a name="l00697"></a><span class="lineno"> 697</span>&#160;</div><div class="line"><a name="l00698"></a><span class="lineno"> 698</span>&#160; <span class="keyword">explicit</span> constexpr <span class="keyword">operator</span> bool() <span class="keyword">const</span> noexcept {</div><div class="line"><a name="l00699"></a><span class="lineno"> 699</span>&#160; <span class="keywordflow">return</span> ref != <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00700"></a><span class="lineno"> 700</span>&#160; }</div><div class="line"><a name="l00701"></a><span class="lineno"> 701</span>&#160;</div><div class="line"><a name="l00702"></a><span class="lineno"> 702</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">class</span> V&gt;</div><div class="line"><a name="l00703"></a><span class="lineno"> 703</span>&#160; constexpr <span class="keyword">typename</span> decay&lt;T&gt;::type value_or(V&amp;&amp; v)<span class="keyword"> const</span></div><div class="line"><a name="l00704"></a><span class="lineno"> 704</span>&#160;<span class="keyword"> </span>{</div><div class="line"><a name="l00705"></a><span class="lineno"> 705</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span> ? **<span class="keyword">this</span> : detail_::convert&lt;typename decay&lt;T&gt;::type&gt;(constexpr_forward&lt;V&gt;(v));</div><div class="line"><a name="l00706"></a><span class="lineno"> 706</span>&#160; }</div><div class="line"><a name="l00707"></a><span class="lineno"> 707</span>&#160;};</div><div class="line"><a name="l00708"></a><span class="lineno"> 708</span>&#160;</div><div class="line"><a name="l00709"></a><span class="lineno"> 709</span>&#160;</div><div class="line"><a name="l00710"></a><span class="lineno"> 710</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l00711"></a><span class="lineno"><a class="line" href="classstd_1_1experimental_1_1optional_3_01T_01_6_6_01_4.html"> 711</a></span>&#160;<span class="keyword">class </span><a class="code" href="classstd_1_1experimental_1_1optional.html">optional</a>&lt;T&amp;&amp;&gt;</div><div class="line"><a name="l00712"></a><span class="lineno"> 712</span>&#160;{</div><div class="line"><a name="l00713"></a><span class="lineno"> 713</span>&#160; static_assert( <span class="keyword">sizeof</span>(T) == 0, <span class="stringliteral">&quot;optional rvalue references disallowed&quot;</span> );</div><div class="line"><a name="l00714"></a><span class="lineno"> 714</span>&#160;};</div><div class="line"><a name="l00715"></a><span class="lineno"> 715</span>&#160;</div><div class="line"><a name="l00716"></a><span class="lineno"> 716</span>&#160;</div><div class="line"><a name="l00717"></a><span class="lineno"> 717</span>&#160;<span class="comment">// 20.5.8, Relational operators</span></div><div class="line"><a name="l00718"></a><span class="lineno"> 718</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; y)</div><div class="line"><a name="l00719"></a><span class="lineno"> 719</span>&#160;{</div><div class="line"><a name="l00720"></a><span class="lineno"> 720</span>&#160; <span class="keywordflow">return</span> bool(x) != bool(y) ? <span class="keyword">false</span> : bool(x) == <span class="keyword">false</span> ? <span class="keyword">true</span> : *x == *y;</div><div class="line"><a name="l00721"></a><span class="lineno"> 721</span>&#160;}</div><div class="line"><a name="l00722"></a><span class="lineno"> 722</span>&#160;</div><div class="line"><a name="l00723"></a><span class="lineno"> 723</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; y)</div><div class="line"><a name="l00724"></a><span class="lineno"> 724</span>&#160;{</div><div class="line"><a name="l00725"></a><span class="lineno"> 725</span>&#160; <span class="keywordflow">return</span> !(x == y);</div><div class="line"><a name="l00726"></a><span class="lineno"> 726</span>&#160;}</div><div class="line"><a name="l00727"></a><span class="lineno"> 727</span>&#160;</div><div class="line"><a name="l00728"></a><span class="lineno"> 728</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;(const optional&lt;T&gt;&amp; x, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; y)</div><div class="line"><a name="l00729"></a><span class="lineno"> 729</span>&#160;{</div><div class="line"><a name="l00730"></a><span class="lineno"> 730</span>&#160; <span class="keywordflow">return</span> (!y) ? <span class="keyword">false</span> : (!x) ? <span class="keyword">true</span> : *x &lt; *y;</div><div class="line"><a name="l00731"></a><span class="lineno"> 731</span>&#160;}</div><div class="line"><a name="l00732"></a><span class="lineno"> 732</span>&#160;</div><div class="line"><a name="l00733"></a><span class="lineno"> 733</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; y)</div><div class="line"><a name="l00734"></a><span class="lineno"> 734</span>&#160;{</div><div class="line"><a name="l00735"></a><span class="lineno"> 735</span>&#160; <span class="keywordflow">return</span> (y &lt; x);</div><div class="line"><a name="l00736"></a><span class="lineno"> 736</span>&#160;}</div><div class="line"><a name="l00737"></a><span class="lineno"> 737</span>&#160;</div><div class="line"><a name="l00738"></a><span class="lineno"> 738</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;=(const optional&lt;T&gt;&amp; x, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; y)</div><div class="line"><a name="l00739"></a><span class="lineno"> 739</span>&#160;{</div><div class="line"><a name="l00740"></a><span class="lineno"> 740</span>&#160; <span class="keywordflow">return</span> !(y &lt; x);</div><div class="line"><a name="l00741"></a><span class="lineno"> 741</span>&#160;}</div><div class="line"><a name="l00742"></a><span class="lineno"> 742</span>&#160;</div><div class="line"><a name="l00743"></a><span class="lineno"> 743</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;=(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; y)</div><div class="line"><a name="l00744"></a><span class="lineno"> 744</span>&#160;{</div><div class="line"><a name="l00745"></a><span class="lineno"> 745</span>&#160; <span class="keywordflow">return</span> !(x &lt; y);</div><div class="line"><a name="l00746"></a><span class="lineno"> 746</span>&#160;}</div><div class="line"><a name="l00747"></a><span class="lineno"> 747</span>&#160;</div><div class="line"><a name="l00748"></a><span class="lineno"> 748</span>&#160;</div><div class="line"><a name="l00749"></a><span class="lineno"> 749</span>&#160;<span class="comment">// 20.5.9, Comparison with nullopt</span></div><div class="line"><a name="l00750"></a><span class="lineno"> 750</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x, <a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>) noexcept</div><div class="line"><a name="l00751"></a><span class="lineno"> 751</span>&#160;{</div><div class="line"><a name="l00752"></a><span class="lineno"> 752</span>&#160; <span class="keywordflow">return</span> (!x);</div><div class="line"><a name="l00753"></a><span class="lineno"> 753</span>&#160;}</div><div class="line"><a name="l00754"></a><span class="lineno"> 754</span>&#160;</div><div class="line"><a name="l00755"></a><span class="lineno"> 755</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator==(<a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x) noexcept</div><div class="line"><a name="l00756"></a><span class="lineno"> 756</span>&#160;{</div><div class="line"><a name="l00757"></a><span class="lineno"> 757</span>&#160; <span class="keywordflow">return</span> (!x);</div><div class="line"><a name="l00758"></a><span class="lineno"> 758</span>&#160;}</div><div class="line"><a name="l00759"></a><span class="lineno"> 759</span>&#160;</div><div class="line"><a name="l00760"></a><span class="lineno"> 760</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x, <a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>) noexcept</div><div class="line"><a name="l00761"></a><span class="lineno"> 761</span>&#160;{</div><div class="line"><a name="l00762"></a><span class="lineno"> 762</span>&#160; <span class="keywordflow">return</span> bool(x);</div><div class="line"><a name="l00763"></a><span class="lineno"> 763</span>&#160;}</div><div class="line"><a name="l00764"></a><span class="lineno"> 764</span>&#160;</div><div class="line"><a name="l00765"></a><span class="lineno"> 765</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator!=(<a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x) noexcept</div><div class="line"><a name="l00766"></a><span class="lineno"> 766</span>&#160;{</div><div class="line"><a name="l00767"></a><span class="lineno"> 767</span>&#160; <span class="keywordflow">return</span> bool(x);</div><div class="line"><a name="l00768"></a><span class="lineno"> 768</span>&#160;}</div><div class="line"><a name="l00769"></a><span class="lineno"> 769</span>&#160;</div><div class="line"><a name="l00770"></a><span class="lineno"> 770</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;(const optional&lt;T&gt;&amp;, <a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>) noexcept</div><div class="line"><a name="l00771"></a><span class="lineno"> 771</span>&#160;{</div><div class="line"><a name="l00772"></a><span class="lineno"> 772</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00773"></a><span class="lineno"> 773</span>&#160;}</div><div class="line"><a name="l00774"></a><span class="lineno"> 774</span>&#160;</div><div class="line"><a name="l00775"></a><span class="lineno"> 775</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;(nullopt_t, const optional&lt;T&gt;&amp; x) noexcept</div><div class="line"><a name="l00776"></a><span class="lineno"> 776</span>&#160;{</div><div class="line"><a name="l00777"></a><span class="lineno"> 777</span>&#160; <span class="keywordflow">return</span> bool(x);</div><div class="line"><a name="l00778"></a><span class="lineno"> 778</span>&#160;}</div><div class="line"><a name="l00779"></a><span class="lineno"> 779</span>&#160;</div><div class="line"><a name="l00780"></a><span class="lineno"> 780</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;=(const optional&lt;T&gt;&amp; x, <a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>) noexcept</div><div class="line"><a name="l00781"></a><span class="lineno"> 781</span>&#160;{</div><div class="line"><a name="l00782"></a><span class="lineno"> 782</span>&#160; <span class="keywordflow">return</span> (!x);</div><div class="line"><a name="l00783"></a><span class="lineno"> 783</span>&#160;}</div><div class="line"><a name="l00784"></a><span class="lineno"> 784</span>&#160;</div><div class="line"><a name="l00785"></a><span class="lineno"> 785</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;=(nullopt_t, const optional&lt;T&gt;&amp;) noexcept</div><div class="line"><a name="l00786"></a><span class="lineno"> 786</span>&#160;{</div><div class="line"><a name="l00787"></a><span class="lineno"> 787</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00788"></a><span class="lineno"> 788</span>&#160;}</div><div class="line"><a name="l00789"></a><span class="lineno"> 789</span>&#160;</div><div class="line"><a name="l00790"></a><span class="lineno"> 790</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x, <a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>) noexcept</div><div class="line"><a name="l00791"></a><span class="lineno"> 791</span>&#160;{</div><div class="line"><a name="l00792"></a><span class="lineno"> 792</span>&#160; <span class="keywordflow">return</span> bool(x);</div><div class="line"><a name="l00793"></a><span class="lineno"> 793</span>&#160;}</div><div class="line"><a name="l00794"></a><span class="lineno"> 794</span>&#160;</div><div class="line"><a name="l00795"></a><span class="lineno"> 795</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;(<a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp;) noexcept</div><div class="line"><a name="l00796"></a><span class="lineno"> 796</span>&#160;{</div><div class="line"><a name="l00797"></a><span class="lineno"> 797</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00798"></a><span class="lineno"> 798</span>&#160;}</div><div class="line"><a name="l00799"></a><span class="lineno"> 799</span>&#160;</div><div class="line"><a name="l00800"></a><span class="lineno"> 800</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;=(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp;, <a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>) noexcept</div><div class="line"><a name="l00801"></a><span class="lineno"> 801</span>&#160;{</div><div class="line"><a name="l00802"></a><span class="lineno"> 802</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00803"></a><span class="lineno"> 803</span>&#160;}</div><div class="line"><a name="l00804"></a><span class="lineno"> 804</span>&#160;</div><div class="line"><a name="l00805"></a><span class="lineno"> 805</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;=(<a class="code" href="structstd_1_1experimental_1_1nullopt__t.html">nullopt_t</a>, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x) noexcept</div><div class="line"><a name="l00806"></a><span class="lineno"> 806</span>&#160;{</div><div class="line"><a name="l00807"></a><span class="lineno"> 807</span>&#160; <span class="keywordflow">return</span> (!x);</div><div class="line"><a name="l00808"></a><span class="lineno"> 808</span>&#160;}</div><div class="line"><a name="l00809"></a><span class="lineno"> 809</span>&#160;</div><div class="line"><a name="l00810"></a><span class="lineno"> 810</span>&#160;</div><div class="line"><a name="l00811"></a><span class="lineno"> 811</span>&#160;</div><div class="line"><a name="l00812"></a><span class="lineno"> 812</span>&#160;<span class="comment">// 20.5.10, Comparison with T</span></div><div class="line"><a name="l00813"></a><span class="lineno"> 813</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00814"></a><span class="lineno"> 814</span>&#160;{</div><div class="line"><a name="l00815"></a><span class="lineno"> 815</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x == v : <span class="keyword">false</span>;</div><div class="line"><a name="l00816"></a><span class="lineno"> 816</span>&#160;}</div><div class="line"><a name="l00817"></a><span class="lineno"> 817</span>&#160;</div><div class="line"><a name="l00818"></a><span class="lineno"> 818</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> T&amp; v, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x)</div><div class="line"><a name="l00819"></a><span class="lineno"> 819</span>&#160;{</div><div class="line"><a name="l00820"></a><span class="lineno"> 820</span>&#160; <span class="keywordflow">return</span> bool(x) ? v == *x : <span class="keyword">false</span>;</div><div class="line"><a name="l00821"></a><span class="lineno"> 821</span>&#160;}</div><div class="line"><a name="l00822"></a><span class="lineno"> 822</span>&#160;</div><div class="line"><a name="l00823"></a><span class="lineno"> 823</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00824"></a><span class="lineno"> 824</span>&#160;{</div><div class="line"><a name="l00825"></a><span class="lineno"> 825</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x != v : <span class="keyword">true</span>;</div><div class="line"><a name="l00826"></a><span class="lineno"> 826</span>&#160;}</div><div class="line"><a name="l00827"></a><span class="lineno"> 827</span>&#160;</div><div class="line"><a name="l00828"></a><span class="lineno"> 828</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> T&amp; v, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x)</div><div class="line"><a name="l00829"></a><span class="lineno"> 829</span>&#160;{</div><div class="line"><a name="l00830"></a><span class="lineno"> 830</span>&#160; <span class="keywordflow">return</span> bool(x) ? v != *x : <span class="keyword">true</span>;</div><div class="line"><a name="l00831"></a><span class="lineno"> 831</span>&#160;}</div><div class="line"><a name="l00832"></a><span class="lineno"> 832</span>&#160;</div><div class="line"><a name="l00833"></a><span class="lineno"> 833</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;(const optional&lt;T&gt;&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00834"></a><span class="lineno"> 834</span>&#160;{</div><div class="line"><a name="l00835"></a><span class="lineno"> 835</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x &lt; v : <span class="keyword">true</span>;</div><div class="line"><a name="l00836"></a><span class="lineno"> 836</span>&#160;}</div><div class="line"><a name="l00837"></a><span class="lineno"> 837</span>&#160;</div><div class="line"><a name="l00838"></a><span class="lineno"> 838</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;(<span class="keyword">const</span> T&amp; v, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x)</div><div class="line"><a name="l00839"></a><span class="lineno"> 839</span>&#160;{</div><div class="line"><a name="l00840"></a><span class="lineno"> 840</span>&#160; <span class="keywordflow">return</span> bool(x) ? v &gt; *x : <span class="keyword">true</span>;</div><div class="line"><a name="l00841"></a><span class="lineno"> 841</span>&#160;}</div><div class="line"><a name="l00842"></a><span class="lineno"> 842</span>&#160;</div><div class="line"><a name="l00843"></a><span class="lineno"> 843</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00844"></a><span class="lineno"> 844</span>&#160;{</div><div class="line"><a name="l00845"></a><span class="lineno"> 845</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x &gt; v : <span class="keyword">false</span>;</div><div class="line"><a name="l00846"></a><span class="lineno"> 846</span>&#160;}</div><div class="line"><a name="l00847"></a><span class="lineno"> 847</span>&#160;</div><div class="line"><a name="l00848"></a><span class="lineno"> 848</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;(const T&amp; v, const optional&lt;T&gt;&amp; x)</div><div class="line"><a name="l00849"></a><span class="lineno"> 849</span>&#160;{</div><div class="line"><a name="l00850"></a><span class="lineno"> 850</span>&#160; <span class="keywordflow">return</span> bool(x) ? v &lt; *x : <span class="keyword">false</span>;</div><div class="line"><a name="l00851"></a><span class="lineno"> 851</span>&#160;}</div><div class="line"><a name="l00852"></a><span class="lineno"> 852</span>&#160;</div><div class="line"><a name="l00853"></a><span class="lineno"> 853</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;=(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00854"></a><span class="lineno"> 854</span>&#160;{</div><div class="line"><a name="l00855"></a><span class="lineno"> 855</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x &gt;= v : <span class="keyword">false</span>;</div><div class="line"><a name="l00856"></a><span class="lineno"> 856</span>&#160;}</div><div class="line"><a name="l00857"></a><span class="lineno"> 857</span>&#160;</div><div class="line"><a name="l00858"></a><span class="lineno"> 858</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;=(const T&amp; v, const optional&lt;T&gt;&amp; x)</div><div class="line"><a name="l00859"></a><span class="lineno"> 859</span>&#160;{</div><div class="line"><a name="l00860"></a><span class="lineno"> 860</span>&#160; <span class="keywordflow">return</span> bool(x) ? v &lt;= *x : <span class="keyword">false</span>;</div><div class="line"><a name="l00861"></a><span class="lineno"> 861</span>&#160;}</div><div class="line"><a name="l00862"></a><span class="lineno"> 862</span>&#160;</div><div class="line"><a name="l00863"></a><span class="lineno"> 863</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;=(const optional&lt;T&gt;&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00864"></a><span class="lineno"> 864</span>&#160;{</div><div class="line"><a name="l00865"></a><span class="lineno"> 865</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x &lt;= v : <span class="keyword">true</span>;</div><div class="line"><a name="l00866"></a><span class="lineno"> 866</span>&#160;}</div><div class="line"><a name="l00867"></a><span class="lineno"> 867</span>&#160;</div><div class="line"><a name="l00868"></a><span class="lineno"> 868</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;=(<span class="keyword">const</span> T&amp; v, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x)</div><div class="line"><a name="l00869"></a><span class="lineno"> 869</span>&#160;{</div><div class="line"><a name="l00870"></a><span class="lineno"> 870</span>&#160; <span class="keywordflow">return</span> bool(x) ? v &gt;= *x : <span class="keyword">true</span>;</div><div class="line"><a name="l00871"></a><span class="lineno"> 871</span>&#160;}</div><div class="line"><a name="l00872"></a><span class="lineno"> 872</span>&#160;</div><div class="line"><a name="l00873"></a><span class="lineno"> 873</span>&#160;</div><div class="line"><a name="l00874"></a><span class="lineno"> 874</span>&#160;<span class="comment">// Comparison of optional&lt;T&amp;&gt; with T</span></div><div class="line"><a name="l00875"></a><span class="lineno"> 875</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">optional&lt;T&amp;&gt;</a>&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00876"></a><span class="lineno"> 876</span>&#160;{</div><div class="line"><a name="l00877"></a><span class="lineno"> 877</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x == v : <span class="keyword">false</span>;</div><div class="line"><a name="l00878"></a><span class="lineno"> 878</span>&#160;}</div><div class="line"><a name="l00879"></a><span class="lineno"> 879</span>&#160;</div><div class="line"><a name="l00880"></a><span class="lineno"> 880</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> T&amp; v, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">optional&lt;T&amp;&gt;</a>&amp; x)</div><div class="line"><a name="l00881"></a><span class="lineno"> 881</span>&#160;{</div><div class="line"><a name="l00882"></a><span class="lineno"> 882</span>&#160; <span class="keywordflow">return</span> bool(x) ? v == *x : <span class="keyword">false</span>;</div><div class="line"><a name="l00883"></a><span class="lineno"> 883</span>&#160;}</div><div class="line"><a name="l00884"></a><span class="lineno"> 884</span>&#160;</div><div class="line"><a name="l00885"></a><span class="lineno"> 885</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">optional&lt;T&amp;&gt;</a>&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00886"></a><span class="lineno"> 886</span>&#160;{</div><div class="line"><a name="l00887"></a><span class="lineno"> 887</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x != v : <span class="keyword">true</span>;</div><div class="line"><a name="l00888"></a><span class="lineno"> 888</span>&#160;}</div><div class="line"><a name="l00889"></a><span class="lineno"> 889</span>&#160;</div><div class="line"><a name="l00890"></a><span class="lineno"> 890</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> T&amp; v, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">optional&lt;T&amp;&gt;</a>&amp; x)</div><div class="line"><a name="l00891"></a><span class="lineno"> 891</span>&#160;{</div><div class="line"><a name="l00892"></a><span class="lineno"> 892</span>&#160; <span class="keywordflow">return</span> bool(x) ? v != *x : <span class="keyword">true</span>;</div><div class="line"><a name="l00893"></a><span class="lineno"> 893</span>&#160;}</div><div class="line"><a name="l00894"></a><span class="lineno"> 894</span>&#160;</div><div class="line"><a name="l00895"></a><span class="lineno"> 895</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;(const optional&lt;T&amp;&gt;&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00896"></a><span class="lineno"> 896</span>&#160;{</div><div class="line"><a name="l00897"></a><span class="lineno"> 897</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x &lt; v : <span class="keyword">true</span>;</div><div class="line"><a name="l00898"></a><span class="lineno"> 898</span>&#160;}</div><div class="line"><a name="l00899"></a><span class="lineno"> 899</span>&#160;</div><div class="line"><a name="l00900"></a><span class="lineno"> 900</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;(<span class="keyword">const</span> T&amp; v, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">optional&lt;T&amp;&gt;</a>&amp; x)</div><div class="line"><a name="l00901"></a><span class="lineno"> 901</span>&#160;{</div><div class="line"><a name="l00902"></a><span class="lineno"> 902</span>&#160; <span class="keywordflow">return</span> bool(x) ? v &gt; *x : <span class="keyword">true</span>;</div><div class="line"><a name="l00903"></a><span class="lineno"> 903</span>&#160;}</div><div class="line"><a name="l00904"></a><span class="lineno"> 904</span>&#160;</div><div class="line"><a name="l00905"></a><span class="lineno"> 905</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">optional&lt;T&amp;&gt;</a>&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00906"></a><span class="lineno"> 906</span>&#160;{</div><div class="line"><a name="l00907"></a><span class="lineno"> 907</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x &gt; v : <span class="keyword">false</span>;</div><div class="line"><a name="l00908"></a><span class="lineno"> 908</span>&#160;}</div><div class="line"><a name="l00909"></a><span class="lineno"> 909</span>&#160;</div><div class="line"><a name="l00910"></a><span class="lineno"> 910</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;(const T&amp; v, const optional&lt;T&amp;&gt;&amp; x)</div><div class="line"><a name="l00911"></a><span class="lineno"> 911</span>&#160;{</div><div class="line"><a name="l00912"></a><span class="lineno"> 912</span>&#160; <span class="keywordflow">return</span> bool(x) ? v &lt; *x : <span class="keyword">false</span>;</div><div class="line"><a name="l00913"></a><span class="lineno"> 913</span>&#160;}</div><div class="line"><a name="l00914"></a><span class="lineno"> 914</span>&#160;</div><div class="line"><a name="l00915"></a><span class="lineno"> 915</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;=(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">optional&lt;T&amp;&gt;</a>&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00916"></a><span class="lineno"> 916</span>&#160;{</div><div class="line"><a name="l00917"></a><span class="lineno"> 917</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x &gt;= v : <span class="keyword">false</span>;</div><div class="line"><a name="l00918"></a><span class="lineno"> 918</span>&#160;}</div><div class="line"><a name="l00919"></a><span class="lineno"> 919</span>&#160;</div><div class="line"><a name="l00920"></a><span class="lineno"> 920</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;=(const T&amp; v, const optional&lt;T&amp;&gt;&amp; x)</div><div class="line"><a name="l00921"></a><span class="lineno"> 921</span>&#160;{</div><div class="line"><a name="l00922"></a><span class="lineno"> 922</span>&#160; <span class="keywordflow">return</span> bool(x) ? v &lt;= *x : <span class="keyword">false</span>;</div><div class="line"><a name="l00923"></a><span class="lineno"> 923</span>&#160;}</div><div class="line"><a name="l00924"></a><span class="lineno"> 924</span>&#160;</div><div class="line"><a name="l00925"></a><span class="lineno"> 925</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;=(const optional&lt;T&amp;&gt;&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00926"></a><span class="lineno"> 926</span>&#160;{</div><div class="line"><a name="l00927"></a><span class="lineno"> 927</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x &lt;= v : <span class="keyword">true</span>;</div><div class="line"><a name="l00928"></a><span class="lineno"> 928</span>&#160;}</div><div class="line"><a name="l00929"></a><span class="lineno"> 929</span>&#160;</div><div class="line"><a name="l00930"></a><span class="lineno"> 930</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;=(<span class="keyword">const</span> T&amp; v, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">optional&lt;T&amp;&gt;</a>&amp; x)</div><div class="line"><a name="l00931"></a><span class="lineno"> 931</span>&#160;{</div><div class="line"><a name="l00932"></a><span class="lineno"> 932</span>&#160; <span class="keywordflow">return</span> bool(x) ? v &gt;= *x : <span class="keyword">true</span>;</div><div class="line"><a name="l00933"></a><span class="lineno"> 933</span>&#160;}</div><div class="line"><a name="l00934"></a><span class="lineno"> 934</span>&#160;</div><div class="line"><a name="l00935"></a><span class="lineno"> 935</span>&#160;<span class="comment">// Comparison of optional&lt;T const&amp;&gt; with T</span></div><div class="line"><a name="l00936"></a><span class="lineno"> 936</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;const T&amp;&gt;</a>&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00937"></a><span class="lineno"> 937</span>&#160;{</div><div class="line"><a name="l00938"></a><span class="lineno"> 938</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x == v : <span class="keyword">false</span>;</div><div class="line"><a name="l00939"></a><span class="lineno"> 939</span>&#160;}</div><div class="line"><a name="l00940"></a><span class="lineno"> 940</span>&#160;</div><div class="line"><a name="l00941"></a><span class="lineno"> 941</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> T&amp; v, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;const T&amp;&gt;</a>&amp; x)</div><div class="line"><a name="l00942"></a><span class="lineno"> 942</span>&#160;{</div><div class="line"><a name="l00943"></a><span class="lineno"> 943</span>&#160; <span class="keywordflow">return</span> bool(x) ? v == *x : <span class="keyword">false</span>;</div><div class="line"><a name="l00944"></a><span class="lineno"> 944</span>&#160;}</div><div class="line"><a name="l00945"></a><span class="lineno"> 945</span>&#160;</div><div class="line"><a name="l00946"></a><span class="lineno"> 946</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;const T&amp;&gt;</a>&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00947"></a><span class="lineno"> 947</span>&#160;{</div><div class="line"><a name="l00948"></a><span class="lineno"> 948</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x != v : <span class="keyword">true</span>;</div><div class="line"><a name="l00949"></a><span class="lineno"> 949</span>&#160;}</div><div class="line"><a name="l00950"></a><span class="lineno"> 950</span>&#160;</div><div class="line"><a name="l00951"></a><span class="lineno"> 951</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> T&amp; v, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;const T&amp;&gt;</a>&amp; x)</div><div class="line"><a name="l00952"></a><span class="lineno"> 952</span>&#160;{</div><div class="line"><a name="l00953"></a><span class="lineno"> 953</span>&#160; <span class="keywordflow">return</span> bool(x) ? v != *x : <span class="keyword">true</span>;</div><div class="line"><a name="l00954"></a><span class="lineno"> 954</span>&#160;}</div><div class="line"><a name="l00955"></a><span class="lineno"> 955</span>&#160;</div><div class="line"><a name="l00956"></a><span class="lineno"> 956</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;(const optional&lt;const T&amp;&gt;&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00957"></a><span class="lineno"> 957</span>&#160;{</div><div class="line"><a name="l00958"></a><span class="lineno"> 958</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x &lt; v : <span class="keyword">true</span>;</div><div class="line"><a name="l00959"></a><span class="lineno"> 959</span>&#160;}</div><div class="line"><a name="l00960"></a><span class="lineno"> 960</span>&#160;</div><div class="line"><a name="l00961"></a><span class="lineno"> 961</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;(<span class="keyword">const</span> T&amp; v, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;const T&amp;&gt;</a>&amp; x)</div><div class="line"><a name="l00962"></a><span class="lineno"> 962</span>&#160;{</div><div class="line"><a name="l00963"></a><span class="lineno"> 963</span>&#160; <span class="keywordflow">return</span> bool(x) ? v &gt; *x : <span class="keyword">true</span>;</div><div class="line"><a name="l00964"></a><span class="lineno"> 964</span>&#160;}</div><div class="line"><a name="l00965"></a><span class="lineno"> 965</span>&#160;</div><div class="line"><a name="l00966"></a><span class="lineno"> 966</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;const T&amp;&gt;</a>&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00967"></a><span class="lineno"> 967</span>&#160;{</div><div class="line"><a name="l00968"></a><span class="lineno"> 968</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x &gt; v : <span class="keyword">false</span>;</div><div class="line"><a name="l00969"></a><span class="lineno"> 969</span>&#160;}</div><div class="line"><a name="l00970"></a><span class="lineno"> 970</span>&#160;</div><div class="line"><a name="l00971"></a><span class="lineno"> 971</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;(const T&amp; v, const optional&lt;const T&amp;&gt;&amp; x)</div><div class="line"><a name="l00972"></a><span class="lineno"> 972</span>&#160;{</div><div class="line"><a name="l00973"></a><span class="lineno"> 973</span>&#160; <span class="keywordflow">return</span> bool(x) ? v &lt; *x : <span class="keyword">false</span>;</div><div class="line"><a name="l00974"></a><span class="lineno"> 974</span>&#160;}</div><div class="line"><a name="l00975"></a><span class="lineno"> 975</span>&#160;</div><div class="line"><a name="l00976"></a><span class="lineno"> 976</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;=(<span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;const T&amp;&gt;</a>&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00977"></a><span class="lineno"> 977</span>&#160;{</div><div class="line"><a name="l00978"></a><span class="lineno"> 978</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x &gt;= v : <span class="keyword">false</span>;</div><div class="line"><a name="l00979"></a><span class="lineno"> 979</span>&#160;}</div><div class="line"><a name="l00980"></a><span class="lineno"> 980</span>&#160;</div><div class="line"><a name="l00981"></a><span class="lineno"> 981</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;=(const T&amp; v, const optional&lt;const T&amp;&gt;&amp; x)</div><div class="line"><a name="l00982"></a><span class="lineno"> 982</span>&#160;{</div><div class="line"><a name="l00983"></a><span class="lineno"> 983</span>&#160; <span class="keywordflow">return</span> bool(x) ? v &lt;= *x : <span class="keyword">false</span>;</div><div class="line"><a name="l00984"></a><span class="lineno"> 984</span>&#160;}</div><div class="line"><a name="l00985"></a><span class="lineno"> 985</span>&#160;</div><div class="line"><a name="l00986"></a><span class="lineno"> 986</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&lt;=(const optional&lt;const T&amp;&gt;&amp; x, <span class="keyword">const</span> T&amp; v)</div><div class="line"><a name="l00987"></a><span class="lineno"> 987</span>&#160;{</div><div class="line"><a name="l00988"></a><span class="lineno"> 988</span>&#160; <span class="keywordflow">return</span> bool(x) ? *x &lt;= v : <span class="keyword">true</span>;</div><div class="line"><a name="l00989"></a><span class="lineno"> 989</span>&#160;}</div><div class="line"><a name="l00990"></a><span class="lineno"> 990</span>&#160;</div><div class="line"><a name="l00991"></a><span class="lineno"> 991</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; constexpr <span class="keywordtype">bool</span> operator&gt;=(<span class="keyword">const</span> T&amp; v, <span class="keyword">const</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;const T&amp;&gt;</a>&amp; x)</div><div class="line"><a name="l00992"></a><span class="lineno"> 992</span>&#160;{</div><div class="line"><a name="l00993"></a><span class="lineno"> 993</span>&#160; <span class="keywordflow">return</span> bool(x) ? v &gt;= *x : <span class="keyword">true</span>;</div><div class="line"><a name="l00994"></a><span class="lineno"> 994</span>&#160;}</div><div class="line"><a name="l00995"></a><span class="lineno"> 995</span>&#160;</div><div class="line"><a name="l00996"></a><span class="lineno"> 996</span>&#160;</div><div class="line"><a name="l00997"></a><span class="lineno"> 997</span>&#160;<span class="comment">// 20.5.12, Specialized algorithms</span></div><div class="line"><a name="l00998"></a><span class="lineno"> 998</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l00999"></a><span class="lineno"> 999</span>&#160;<span class="keywordtype">void</span> swap(<a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; x, <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;T&gt;</a>&amp; y) noexcept(noexcept(x.swap(y)))</div><div class="line"><a name="l01000"></a><span class="lineno"> 1000</span>&#160;{</div><div class="line"><a name="l01001"></a><span class="lineno"> 1001</span>&#160; x.swap(y);</div><div class="line"><a name="l01002"></a><span class="lineno"> 1002</span>&#160;}</div><div class="line"><a name="l01003"></a><span class="lineno"> 1003</span>&#160;</div><div class="line"><a name="l01004"></a><span class="lineno"> 1004</span>&#160;</div><div class="line"><a name="l01005"></a><span class="lineno"> 1005</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l01006"></a><span class="lineno"> 1006</span>&#160;constexpr <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;typename decay&lt;T&gt;::type</a>&gt; make_optional(T&amp;&amp; v)</div><div class="line"><a name="l01007"></a><span class="lineno"> 1007</span>&#160;{</div><div class="line"><a name="l01008"></a><span class="lineno"> 1008</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;typename decay&lt;T&gt;::type</a>&gt;(constexpr_forward&lt;T&gt;(v));</div><div class="line"><a name="l01009"></a><span class="lineno"> 1009</span>&#160;}</div><div class="line"><a name="l01010"></a><span class="lineno"> 1010</span>&#160;</div><div class="line"><a name="l01011"></a><span class="lineno"> 1011</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> X&gt;</div><div class="line"><a name="l01012"></a><span class="lineno"> 1012</span>&#160;constexpr <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;X&amp;&gt;</a> make_optional(reference_wrapper&lt;X&gt; v)</div><div class="line"><a name="l01013"></a><span class="lineno"> 1013</span>&#160;{</div><div class="line"><a name="l01014"></a><span class="lineno"> 1014</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">optional&lt;X&amp;&gt;</a>(v.get());</div><div class="line"><a name="l01015"></a><span class="lineno"> 1015</span>&#160;}</div><div class="line"><a name="l01016"></a><span class="lineno"> 1016</span>&#160;</div><div class="line"><a name="l01017"></a><span class="lineno"> 1017</span>&#160;</div><div class="line"><a name="l01018"></a><span class="lineno"> 1018</span>&#160;} <span class="comment">// namespace experimental</span></div><div class="line"><a name="l01019"></a><span class="lineno"> 1019</span>&#160;} <span class="comment">// namespace std</span></div><div class="line"><a name="l01020"></a><span class="lineno"> 1020</span>&#160;</div><div class="line"><a name="l01021"></a><span class="lineno"> 1021</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacestd.html">std</a></div><div class="line"><a name="l01022"></a><span class="lineno"> 1022</span>&#160;{</div><div class="line"><a name="l01023"></a><span class="lineno"> 1023</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l01024"></a><span class="lineno"><a class="line" href="structstd_1_1hash_3_01std_1_1experimental_1_1optional_3_01T_01_4_01_4.html"> 1024</a></span>&#160; <span class="keyword">struct </span>hash&lt;<a class="code" href="namespacestd.html">std</a>::<a class="code" href="classstd_1_1experimental_1_1optional.html">experimental::optional</a>&lt;T&gt;&gt;</div><div class="line"><a name="l01025"></a><span class="lineno"> 1025</span>&#160; {</div><div class="line"><a name="l01026"></a><span class="lineno"> 1026</span>&#160; <span class="keyword">typedef</span> <span class="keyword">typename</span> hash&lt;T&gt;::result_type result_type;</div><div class="line"><a name="l01027"></a><span class="lineno"> 1027</span>&#160; <span class="keyword">typedef</span> <a class="code" href="classstd_1_1experimental_1_1optional.html">std::experimental::optional&lt;T&gt;</a> <a class="code" href="classstd_1_1experimental_1_1optional.html">argument_type</a>;</div><div class="line"><a name="l01028"></a><span class="lineno"> 1028</span>&#160;</div><div class="line"><a name="l01029"></a><span class="lineno"> 1029</span>&#160; constexpr result_type operator()(argument_type <span class="keyword">const</span>&amp; arg)<span class="keyword"> const </span>{</div><div class="line"><a name="l01030"></a><span class="lineno"> 1030</span>&#160; <span class="keywordflow">return</span> arg ? std::hash&lt;T&gt;{}(*arg) : result_type{};</div><div class="line"><a name="l01031"></a><span class="lineno"> 1031</span>&#160; }</div><div class="line"><a name="l01032"></a><span class="lineno"> 1032</span>&#160; };</div><div class="line"><a name="l01033"></a><span class="lineno"> 1033</span>&#160;</div><div class="line"><a name="l01034"></a><span class="lineno"> 1034</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l01035"></a><span class="lineno"><a class="line" href="structstd_1_1hash_3_01std_1_1experimental_1_1optional_3_01T_01_6_01_4_01_4.html"> 1035</a></span>&#160; <span class="keyword">struct </span>hash&lt;<a class="code" href="namespacestd.html">std</a>::<a class="code" href="classstd_1_1experimental_1_1optional.html">experimental::optional</a>&lt;T&amp;&gt;&gt;</div><div class="line"><a name="l01036"></a><span class="lineno"> 1036</span>&#160; {</div><div class="line"><a name="l01037"></a><span class="lineno"> 1037</span>&#160; <span class="keyword">typedef</span> <span class="keyword">typename</span> hash&lt;T&gt;::result_type result_type;</div><div class="line"><a name="l01038"></a><span class="lineno"> 1038</span>&#160; <span class="keyword">typedef</span> <a class="code" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">std::experimental::optional&lt;T&amp;&gt;</a> <a class="code" href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">argument_type</a>;</div><div class="line"><a name="l01039"></a><span class="lineno"> 1039</span>&#160;</div><div class="line"><a name="l01040"></a><span class="lineno"> 1040</span>&#160; constexpr result_type operator()(argument_type <span class="keyword">const</span>&amp; arg)<span class="keyword"> const </span>{</div><div class="line"><a name="l01041"></a><span class="lineno"> 1041</span>&#160; <span class="keywordflow">return</span> arg ? std::hash&lt;T&gt;{}(*arg) : result_type{};</div><div class="line"><a name="l01042"></a><span class="lineno"> 1042</span>&#160; }</div><div class="line"><a name="l01043"></a><span class="lineno"> 1043</span>&#160; };</div><div class="line"><a name="l01044"></a><span class="lineno"> 1044</span>&#160;}</div><div class="line"><a name="l01045"></a><span class="lineno"> 1045</span>&#160;</div><div class="line"><a name="l01046"></a><span class="lineno"> 1046</span>&#160;<span class="preprocessor"># undef TR2_OPTIONAL_REQUIRES</span></div><div class="line"><a name="l01047"></a><span class="lineno"> 1047</span>&#160;<span class="preprocessor"># undef TR2_OPTIONAL_ASSERTED_EXPRESSION</span></div><div class="line"><a name="l01048"></a><span class="lineno"> 1048</span>&#160;</div><div class="line"><a name="l01049"></a><span class="lineno"> 1049</span>&#160;<span class="preprocessor"># endif //___OPTIONAL_HPP___</span></div><div class="ttc" id="unionstd_1_1experimental_1_1storage__t_html"><div class="ttname"><a href="unionstd_1_1experimental_1_1storage__t.html">std::experimental::storage_t</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:267</div></div>
<div class="ttc" id="unionstd_1_1experimental_1_1constexpr__storage__t_html"><div class="ttname"><a href="unionstd_1_1experimental_1_1constexpr__storage__t.html">std::experimental::constexpr_storage_t</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:282</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1nullopt__t_html"><div class="ttname"><a href="structstd_1_1experimental_1_1nullopt__t.html">std::experimental::nullopt_t</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:250</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1is__nothrow__move__assignable_1_1has__nothrow__move__assign_html"><div class="ttname"><a href="structstd_1_1experimental_1_1is__nothrow__move__assignable_1_1has__nothrow__move__assign.html">std::experimental::is_nothrow_move_assignable::has_nothrow_move_assign</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:156</div></div>
<div class="ttc" id="namespacestd_html"><div class="ttname"><a href="namespacestd.html">std</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:100</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1nullopt__t_1_1init_html"><div class="ttname"><a href="structstd_1_1experimental_1_1nullopt__t_1_1init.html">std::experimental::nullopt_t::init</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:252</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1detail___1_1has__overloaded__addressof_html"><div class="ttname"><a href="structstd_1_1experimental_1_1detail___1_1has__overloaded__addressof.html">std::experimental::detail_::has_overloaded_addressof</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:211</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1is__assignable_html"><div class="ttname"><a href="structstd_1_1experimental_1_1is__assignable.html">std::experimental::is_assignable</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:139</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1in__place__t_html"><div class="ttname"><a href="structstd_1_1experimental_1_1in__place__t.html">std::experimental::in_place_t</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:246</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1constexpr__optional__base_html"><div class="ttname"><a href="structstd_1_1experimental_1_1constexpr__optional__base.html">std::experimental::constexpr_optional_base</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:320</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1is__nothrow__move__assignable_html"><div class="ttname"><a href="structstd_1_1experimental_1_1is__nothrow__move__assignable.html">std::experimental::is_nothrow_move_assignable</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:153</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1trivial__init__t_html"><div class="ttname"><a href="structstd_1_1experimental_1_1trivial__init__t.html">std::experimental::trivial_init_t</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:242</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1optional__base_html"><div class="ttname"><a href="structstd_1_1experimental_1_1optional__base.html">std::experimental::optional_base</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:297</div></div>
<div class="ttc" id="classstd_1_1experimental_1_1bad__optional__access_html"><div class="ttname"><a href="classstd_1_1experimental_1_1bad__optional__access.html">std::experimental::bad_optional_access</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:259</div></div>
<div class="ttc" id="classstd_1_1experimental_1_1optional_html"><div class="ttname"><a href="classstd_1_1experimental_1_1optional.html">std::experimental::optional</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:175</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1is__nothrow__move__constructible_html"><div class="ttname"><a href="structstd_1_1experimental_1_1is__nothrow__move__constructible.html">std::experimental::is_nothrow_move_constructible</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:132</div></div>
<div class="ttc" id="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4_html"><div class="ttname"><a href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">std::experimental::optional&lt; T &amp; &gt;</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:610</div></div>
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