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<a href="a00956.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> // <experimental/any> -*- C++ -*-</div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> // Copyright (C) 2014-2015 Free Software Foundation, Inc.</div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> //</div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> // This file is part of the GNU ISO C++ Library. This library is free</div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> // software; you can redistribute it and/or modify it under the</div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> // terms of the GNU General Public License as published by the</div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> // Free Software Foundation; either version 3, or (at your option)</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> // any later version.</div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> // This library is distributed in the hope that it will be useful,</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> // but WITHOUT ANY WARRANTY; without even the implied warranty of</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> // GNU General Public License for more details.</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> // Under Section 7 of GPL version 3, you are granted additional</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> // permissions described in the GCC Runtime Library Exception, version</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> // 3.1, as published by the Free Software Foundation.</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> // You should have received a copy of the GNU General Public License and</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> // a copy of the GCC Runtime Library Exception along with this program;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> // <http://www.gnu.org/licenses/>.</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> /** @file experimental/any</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  * This is a TS C++ Library header.</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  */</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> #ifndef _GLIBCXX_EXPERIMENTAL_ANY</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> #define _GLIBCXX_EXPERIMENTAL_ANY 1</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> #pragma GCC system_header</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> #if __cplusplus <= 201103L</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> # include <bits/c++14_warning.h></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> #else</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> #include <typeinfo></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> #include <new></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> #include <utility></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> #include <type_traits></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> #include <experimental/lfts_config.h></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> namespace std _GLIBCXX_VISIBILITY(default)</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> {</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> namespace experimental</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> {</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> inline namespace fundamentals_v1</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> {</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  /**</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  * @defgroup any Type-safe container of any type</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  * @ingroup experimental</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  *</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  * A type-safe container for single values of value types, as</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  * described in n3804 "Any Library Proposal (Revision 3)".</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  *</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  * @{</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  */</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> #define __cpp_lib_experimental_any 201411</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  /**</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  * @brief Exception class thrown by a failed @c any_cast</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  * @ingroup exceptions</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  */</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  class bad_any_cast : public bad_cast</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  {</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  public:</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  virtual const char* what() const noexcept { return "bad any_cast"; }</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  };</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  [[gnu::noreturn]] inline void __throw_bad_any_cast()</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  {</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> #if __cpp_exceptions</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  throw bad_any_cast{};</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> #else</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  __builtin_abort();</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> #endif</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  }</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  /**</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  * @brief A type-safe container of any type.</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  * </div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  * An @c any object's state is either empty or it stores a contained object</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  * of CopyConstructible type.</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  */</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  class any</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  {</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  // Holds either pointer to a heap object or the contained object itself.</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  union _Storage</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  {</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  void* _M_ptr;</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  std::aligned_storage<sizeof(_M_ptr), sizeof(_M_ptr)>::type _M_buffer;</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  };</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  template<typename _Tp, typename _Safe = is_trivially_copyable<_Tp>,</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  bool _Fits = (sizeof(_Tp) <= sizeof(_Storage))></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  using _Internal = std::integral_constant<bool, _Safe::value && _Fits>;</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  template<typename _Tp></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  struct _Manager_internal; // uses small-object optimization</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> </div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  template<typename _Tp></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  struct _Manager_external; // creates contained object on the heap</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  template<typename _Tp></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  using _Manager = conditional_t<_Internal<_Tp>::value,</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  _Manager_internal<_Tp>,</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  _Manager_external<_Tp>>;</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  template<typename _Tp, typename _Decayed = decay_t<_Tp>></div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  using _Decay = enable_if_t<!is_same<_Decayed, any>::value, _Decayed>;</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> </div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  public:</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  // construct/destruct</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  /// Default constructor, creates an empty object.</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  any() noexcept : _M_manager(nullptr) { }</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> </div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  /// Copy constructor, copies the state of @p __other</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  any(const any& __other) : _M_manager(__other._M_manager)</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  {</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  if (!__other.empty())</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  {</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  _Arg __arg;</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  __arg._M_any = this;</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  _M_manager(_Op_clone, &__other, &__arg);</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  }</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  }</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  /**</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  * @brief Move constructor, transfer the state from @p __other</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  *</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  * @post @c __other.empty() (not guaranteed for other implementations)</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  */</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  any(any&& __other) noexcept</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  : _M_manager(__other._M_manager),</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  _M_storage(__other._M_storage)</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  { __other._M_manager = nullptr; }</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span> </div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  /// Construct with a copy of @p __value as the contained object.</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  template <typename _ValueType, typename _Tp = _Decay<_ValueType>,</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  typename _Mgr = _Manager<_Tp>></div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  any(_ValueType&& __value)</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  : _M_manager(&_Mgr::_S_manage),</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  _M_storage(_Mgr::_S_create(std::forward<_ValueType>(__value)))</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  {</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  static_assert(is_copy_constructible<_Tp>::value,</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  "The contained object must be CopyConstructible");</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  }</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span> </div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  /// Destructor, calls @c clear()</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  ~any() { clear(); }</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  // assignments</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  /// Copy the state of </div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  any& operator=(const any& __rhs)</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  {</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  any(__rhs).swap(*this);</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  return *this;</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  }</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span> </div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  /**</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  * @brief Move assignment operator</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  *</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  * @post @c __rhs.empty() (not guaranteed for other implementations)</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  */</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  any& operator=(any&& __rhs) noexcept</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  {</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  any(std::move(__rhs)).swap(*this);</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  return *this;</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  }</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span> </div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  /// Store a copy of @p __rhs as the contained object.</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  template<typename _ValueType></div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  any& operator=(_ValueType&& __rhs)</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  {</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  any(std::forward<_ValueType>(__rhs)).swap(*this);</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  return *this;</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  }</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span> </div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  // modifiers</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span> </div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  /// If not empty, destroy the contained object.</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  void clear() noexcept</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  {</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  if (!empty())</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  {</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  _M_manager(_Op_destroy, this, nullptr);</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  _M_manager = nullptr;</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  }</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  }</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span> </div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  /// Exchange state with another object.</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  void swap(any& __rhs) noexcept</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  {</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  std::swap(_M_manager, __rhs._M_manager);</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  std::swap(_M_storage, __rhs._M_storage);</div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  }</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span> </div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  // observers</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  /// Reports whether there is a contained object or not.</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  bool empty() const noexcept { return _M_manager == nullptr; }</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span> </div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span> #if __cpp_rtti</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  /// The @c typeid of the contained object, or @c typeid(void) if empty.</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  const type_info& type() const noexcept</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  {</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  if (empty())</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  return typeid(void);</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  _Arg __arg;</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  _M_manager(_Op_get_type_info, this, &__arg);</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  return *__arg._M_typeinfo;</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  }</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span> #endif</div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span> </div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  template<typename _Tp></div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  static constexpr bool __is_valid_cast()</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  { return __or_<is_reference<_Tp>, is_copy_constructible<_Tp>>::value; }</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span> </div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  private:</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  enum _Op { _Op_access, _Op_get_type_info, _Op_clone, _Op_destroy };</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span> </div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  union _Arg</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  {</div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  void* _M_obj;</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  const std::type_info* _M_typeinfo;</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  any* _M_any;</div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  };</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span> </div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  void (*_M_manager)(_Op, const any*, _Arg*);</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  _Storage _M_storage;</div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span> </div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  template<typename _Tp></div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  friend void* __any_caster(const any* __any);</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span> </div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  // Manage in-place contained object.</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  template<typename _Tp></div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  struct _Manager_internal</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  {</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  static void</div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  _S_manage(_Op __which, const any* __anyp, _Arg* __arg);</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span> </div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  template<typename _Up></div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  static _Storage</div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  _S_create(_Up&& __value)</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  {</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  _Storage __storage;</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  void* __addr = &__storage._M_buffer;</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  ::new (__addr) _Tp(std::forward<_Up>(__value));</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  return __storage;</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  }</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span> </div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  template<typename _Alloc, typename _Up></div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  static _Storage</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  _S_alloc(const _Alloc&, _Up&& __value)</div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  {</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  return _S_create(std::forward<_Up>(__value));</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  }</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  };</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span> </div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  // Manage external contained object.</div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  template<typename _Tp></div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  struct _Manager_external</div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  {</div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  static void</div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  _S_manage(_Op __which, const any* __anyp, _Arg* __arg);</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span> </div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  template<typename _Up></div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  static _Storage</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  _S_create(_Up&& __value)</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  {</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  _Storage __storage;</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  __storage._M_ptr = new _Tp(std::forward<_Up>(__value));</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  return __storage;</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  }</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  };</div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  };</div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span> </div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  /// Exchange the states of two @c any objects.</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  inline void swap(any& __x, any& __y) noexcept { __x.swap(__y); }</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span> </div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  /**</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  * @brief Access the contained object.</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  *</div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  * @tparam _ValueType A const-reference or CopyConstructible type.</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  * @param __any The object to access.</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  * @return The contained object.</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  * @throw bad_any_cast If <code></div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  * __any.type() != typeid(remove_reference_t<_ValueType>)</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  * </code></div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  */</div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  template<typename _ValueType></div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  inline _ValueType any_cast(const any& __any)</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  {</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  static_assert(any::__is_valid_cast<_ValueType>(),</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  "Template argument must be a reference or CopyConstructible type");</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  auto __p = any_cast<add_const_t<remove_reference_t<_ValueType>>>(&__any);</div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  if (__p)</div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  return *__p;</div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  __throw_bad_any_cast();</div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  }</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span> </div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  /**</div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  * @brief Access the contained object.</div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  *</div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  * @tparam _ValueType A reference or CopyConstructible type.</div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  * @param __any The object to access.</div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  * @return The contained object.</div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  * @throw bad_any_cast If <code></div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  * __any.type() != typeid(remove_reference_t<_ValueType>)</div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  * </code></div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  *</div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  * @{</div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  */</div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  template<typename _ValueType></div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  inline _ValueType any_cast(any& __any)</div><div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  {</div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  static_assert(any::__is_valid_cast<_ValueType>(),</div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  "Template argument must be a reference or CopyConstructible type");</div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  auto __p = any_cast<remove_reference_t<_ValueType>>(&__any);</div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  if (__p)</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  return *__p;</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  __throw_bad_any_cast();</div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  }</div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span> </div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  template<typename _ValueType></div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  inline _ValueType any_cast(any&& __any)</div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  {</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  static_assert(any::__is_valid_cast<_ValueType>(),</div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  "Template argument must be a reference or CopyConstructible type");</div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  auto __p = any_cast<remove_reference_t<_ValueType>>(&__any);</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  if (__p)</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  return *__p;</div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  __throw_bad_any_cast();</div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  }</div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  // @}</div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span> </div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  template<typename _Tp></div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  void* __any_caster(const any* __any)</div><div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  {</div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  struct _None { };</div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  using _Up = decay_t<_Tp>;</div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  using _Vp = conditional_t<is_copy_constructible<_Up>::value, _Up, _None>;</div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  if (__any->_M_manager != &any::_Manager<_Vp>::_S_manage)</div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  return nullptr;</div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  any::_Arg __arg;</div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  __any->_M_manager(any::_Op_access, __any, &__arg);</div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  return __arg._M_obj;</div><div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  }</div><div class="line"><a name="l00355"></a><span class="lineno"> 355</span> </div><div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  /**</div><div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  * @brief Access the contained object.</div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  *</div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  * @tparam _ValueType The type of the contained object.</div><div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  * @param __any A pointer to the object to access.</div><div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  * @return The address of the contained object if <code></div><div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  * __any != nullptr && __any.type() == typeid(_ValueType)</div><div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  * </code>, otherwise a null pointer.</div><div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  *</div><div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  * @{</div><div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  */</div><div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  template<typename _ValueType></div><div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  inline const _ValueType* any_cast(const any* __any) noexcept</div><div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  {</div><div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  if (__any)</div><div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  return static_cast<_ValueType*>(__any_caster<_ValueType>(__any));</div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  return nullptr;</div><div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  }</div><div class="line"><a name="l00374"></a><span class="lineno"> 374</span> </div><div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  template<typename _ValueType></div><div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  inline _ValueType* any_cast(any* __any) noexcept</div><div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  {</div><div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  if (__any)</div><div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  return static_cast<_ValueType*>(__any_caster<_ValueType>(__any));</div><div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  return nullptr;</div><div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  }</div><div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  // @}</div><div class="line"><a name="l00383"></a><span class="lineno"> 383</span> </div><div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  template<typename _Tp></div><div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  void</div><div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  any::_Manager_internal<_Tp>::</div><div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  _S_manage(_Op __which, const any* __any, _Arg* __arg)</div><div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  {</div><div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  // The contained object is in _M_storage._M_buffer</div><div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  auto __ptr = reinterpret_cast<const _Tp*>(&__any->_M_storage._M_buffer);</div><div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  switch (__which)</div><div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  {</div><div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  case _Op_access:</div><div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  __arg->_M_obj = const_cast<_Tp*>(__ptr);</div><div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  break;</div><div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  case _Op_get_type_info:</div><div class="line"><a name="l00397"></a><span class="lineno"> 397</span> #if __cpp_rtti</div><div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  __arg->_M_typeinfo = &typeid(_Tp);</div><div class="line"><a name="l00399"></a><span class="lineno"> 399</span> #endif</div><div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  break;</div><div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  case _Op_clone:</div><div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  ::new(&__arg->_M_any->_M_storage._M_buffer) _Tp(*__ptr);</div><div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  break;</div><div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  case _Op_destroy:</div><div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  __ptr->~_Tp();</div><div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  break;</div><div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  }</div><div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  }</div><div class="line"><a name="l00409"></a><span class="lineno"> 409</span> </div><div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  template<typename _Tp></div><div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  void</div><div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  any::_Manager_external<_Tp>::</div><div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  _S_manage(_Op __which, const any* __any, _Arg* __arg)</div><div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  {</div><div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  // The contained object is *_M_storage._M_ptr</div><div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  auto __ptr = static_cast<const _Tp*>(__any->_M_storage._M_ptr);</div><div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  switch (__which)</div><div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  {</div><div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  case _Op_access:</div><div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  __arg->_M_obj = const_cast<_Tp*>(__ptr);</div><div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  break;</div><div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  case _Op_get_type_info:</div><div class="line"><a name="l00423"></a><span class="lineno"> 423</span> #if __cpp_rtti</div><div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  __arg->_M_typeinfo = &typeid(_Tp);</div><div class="line"><a name="l00425"></a><span class="lineno"> 425</span> #endif</div><div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  break;</div><div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  case _Op_clone:</div><div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  __arg->_M_any->_M_storage._M_ptr = new _Tp(*__ptr);</div><div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  break;</div><div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  case _Op_destroy:</div><div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  delete __ptr;</div><div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  break;</div><div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  }</div><div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  }</div><div class="line"><a name="l00435"></a><span class="lineno"> 435</span> </div><div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  // @} group any</div><div class="line"><a name="l00437"></a><span class="lineno"> 437</span> _GLIBCXX_END_NAMESPACE_VERSION</div><div class="line"><a name="l00438"></a><span class="lineno"> 438</span> } // namespace fundamentals_v1</div><div class="line"><a name="l00439"></a><span class="lineno"> 439</span> } // namespace experimental</div><div class="line"><a name="l00440"></a><span class="lineno"> 440</span> } // namespace std</div><div class="line"><a name="l00441"></a><span class="lineno"> 441</span> </div><div class="line"><a name="l00442"></a><span class="lineno"> 442</span> #endif // C++14</div><div class="line"><a name="l00443"></a><span class="lineno"> 443</span> </div><div class="line"><a name="l00444"></a><span class="lineno"> 444</span> #endif // _GLIBCXX_EXPERIMENTAL_ANY</div></div><!-- fragment --></div><!-- contents -->
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