<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.15"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>libstdc++: future Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript" src="navtreedata.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
$(document).ready(initResizable);
/* @license-end */</script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td id="projectalign" style="padding-left: 0.5em;">
<div id="projectname">libstdc++
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.15 -->
</div><!-- top -->
<div id="side-nav" class="ui-resizable side-nav-resizable">
<div id="nav-tree">
<div id="nav-tree-contents">
<div id="nav-sync" class="sync"></div>
</div>
</div>
<div id="splitbar" style="-moz-user-select:none;"
class="ui-resizable-handle">
</div>
</div>
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
$(document).ready(function(){initNavTree('a00074_source.html','');});
/* @license-end */
</script>
<div id="doc-content">
<div class="header">
<div class="headertitle">
<div class="title">future</div> </div>
</div><!--header-->
<div class="contents">
<a href="a00074.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> // <future> -*- 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) 2009-2018 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 include/future</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  * This is a Standard 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_FUTURE</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> #define _GLIBCXX_FUTURE 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++0x_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 <mutex></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> #include <thread></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> #include <condition_variable></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> #include <system_error></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> #include <atomic></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> #include <bits/atomic_futex.h></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> #include <bits/functexcept.h></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> #include <bits/invoke.h></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> #include <bits/unique_ptr.h></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> #include <bits/shared_ptr.h></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> #include <bits/std_function.h></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> #include <bits/uses_allocator.h></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> #include <bits/allocated_ptr.h></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> #include <ext/aligned_buffer.h></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> namespace std _GLIBCXX_VISIBILITY(default)</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> {</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> </div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  /**</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  * @defgroup futures Futures</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  * @ingroup concurrency</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>  * Classes for futures support.</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  * @{</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>  /// Error code for futures</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  enum class future_errc</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>  future_already_retrieved = 1,</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  promise_already_satisfied,</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  no_state,</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  broken_promise</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>  /// Specialization.</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  template<></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  struct is_error_code_enum<future_errc> : public true_type { };</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  /// Points to a statically-allocated object derived from error_category.</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  const error_category&</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  future_category() noexcept;</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>  /// Overload for make_error_code.</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  inline error_code</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  make_error_code(future_errc __errc) noexcept</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  { return error_code(static_cast<int>(__errc), future_category()); }</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  /// Overload for make_error_condition.</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  inline error_condition</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  make_error_condition(future_errc __errc) noexcept</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  { return error_condition(static_cast<int>(__errc), future_category()); }</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  /**</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  * @brief Exception type thrown by futures.</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  * @ingroup exceptions</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  */</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  class future_error : public logic_error</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>  public:</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  explicit</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  future_error(future_errc __errc)</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  : future_error(std::make_error_code(__errc))</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  { }</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  virtual ~future_error() noexcept;</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  virtual const char*</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  what() const noexcept;</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  const error_code&</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  code() const noexcept { return _M_code; }</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  private:</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  explicit</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  future_error(error_code __ec)</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  : logic_error("std::future_error: " + __ec.message()), _M_code(__ec)</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  { }</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  friend void __throw_future_error(int);</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> </div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  error_code _M_code;</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> </div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  // Forward declarations.</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  template<typename _Res></div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  class future;</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>  template<typename _Res></div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  class shared_future;</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  template<typename _Signature></div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  class packaged_task;</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>  template<typename _Res></div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  class promise;</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>  /// Launch code for futures</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  enum class launch</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  {</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  async = 1,</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  deferred = 2</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  };</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>  constexpr launch operator&(launch __x, launch __y)</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  {</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  return static_cast<launch>(</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  static_cast<int>(__x) & static_cast<int>(__y));</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  }</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> </div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  constexpr launch operator|(launch __x, launch __y)</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  {</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  return static_cast<launch>(</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  static_cast<int>(__x) | static_cast<int>(__y));</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> </div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  constexpr launch operator^(launch __x, launch __y)</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>  return static_cast<launch>(</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  static_cast<int>(__x) ^ static_cast<int>(__y));</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  }</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span> </div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  constexpr launch operator~(launch __x)</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  { return static_cast<launch>(~static_cast<int>(__x)); }</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span> </div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  inline launch& operator&=(launch& __x, launch __y)</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  { return __x = __x & __y; }</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>  inline launch& operator|=(launch& __x, launch __y)</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  { return __x = __x | __y; }</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span> </div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  inline launch& operator^=(launch& __x, launch __y)</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  { return __x = __x ^ __y; }</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>  /// Status code for futures</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  enum class future_status</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>  ready,</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  timeout,</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  deferred</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  };</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span> </div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  // _GLIBCXX_RESOLVE_LIB_DEFECTS</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  // 2021. Further incorrect usages of result_of</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  template<typename _Fn, typename... _Args></div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  using __async_result_of = typename result_of<</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  typename decay<_Fn>::type(typename decay<_Args>::type...)>::type;</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>  template<typename _Fn, typename... _Args></div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  future<__async_result_of<_Fn, _Args...>></div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  async(launch __policy, _Fn&& __fn, _Args&&... __args);</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span> </div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  template<typename _Fn, typename... _Args></div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  future<__async_result_of<_Fn, _Args...>></div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  async(_Fn&& __fn, _Args&&... __args);</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> #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)</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>  /// Base class and enclosing scope.</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  struct __future_base</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>  /// Base class for results.</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  struct _Result_base</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>  exception_ptr _M_error;</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span> </div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  _Result_base(const _Result_base&) = delete;</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  _Result_base& operator=(const _Result_base&) = delete;</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span> </div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  // _M_destroy() allows derived classes to control deallocation</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  virtual void _M_destroy() = 0;</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span> </div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  struct _Deleter</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>  void operator()(_Result_base* __fr) const { __fr->_M_destroy(); }</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  };</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span> </div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  protected:</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  _Result_base();</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  virtual ~_Result_base();</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  };</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>  /// A unique_ptr for result objects.</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  template<typename _Res></div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  using _Ptr = unique_ptr<_Res, _Result_base::_Deleter>;</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>  /// A result object that has storage for an object of type _Res.</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  template<typename _Res></div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  struct _Result : _Result_base</div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  {</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  private:</div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  __gnu_cxx::__aligned_buffer<_Res> _M_storage;</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  bool _M_initialized;</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span> </div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  public:</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  typedef _Res result_type;</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span> </div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  _Result() noexcept : _M_initialized() { }</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>  ~_Result()</div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  {</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  if (_M_initialized)</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  _M_value().~_Res();</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  }</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span> </div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  // Return lvalue, future will add const or rvalue-reference</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  _Res&</div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  _M_value() noexcept { return *_M_storage._M_ptr(); }</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>  void</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  _M_set(const _Res& __res)</div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  {</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  ::new (_M_storage._M_addr()) _Res(__res);</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  _M_initialized = true;</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  }</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span> </div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  void</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  _M_set(_Res&& __res)</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  {</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  ::new (_M_storage._M_addr()) _Res(std::move(__res));</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  _M_initialized = true;</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  }</div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span> </div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  private:</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  void _M_destroy() { delete this; }</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>  /// A result object that uses an allocator.</div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  template<typename _Res, typename _Alloc></div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  struct _Result_alloc final : _Result<_Res>, _Alloc</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>  using __allocator_type = __alloc_rebind<_Alloc, _Result_alloc>;</div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span> </div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  explicit</div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  _Result_alloc(const _Alloc& __a) : _Result<_Res>(), _Alloc(__a)</div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  { }</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span> </div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  private:</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  void _M_destroy()</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  {</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  __allocator_type __a(*this);</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  __allocated_ptr<__allocator_type> __guard_ptr{ __a, this };</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  this->~_Result_alloc();</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> </div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  // Create a result object that uses an allocator.</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  template<typename _Res, typename _Allocator></div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  static _Ptr<_Result_alloc<_Res, _Allocator>></div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  _S_allocate_result(const _Allocator& __a)</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>  using __result_type = _Result_alloc<_Res, _Allocator>;</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  typename __result_type::__allocator_type __a2(__a);</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  auto __guard = std::__allocate_guarded(__a2);</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  __result_type* __p = ::new((void*)__guard.get()) __result_type{__a};</div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  __guard = nullptr;</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  return _Ptr<__result_type>(__p);</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> </div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  // Keep it simple for std::allocator.</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  template<typename _Res, typename _Tp></div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  static _Ptr<_Result<_Res>></div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  _S_allocate_result(const std::allocator<_Tp>& __a)</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  {</div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  return _Ptr<_Result<_Res>>(new _Result<_Res>);</div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  }</div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span> </div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  // Base class for various types of shared state created by an</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  // asynchronous provider (such as a std::promise) and shared with one</div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  // or more associated futures.</div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  class _State_baseV2</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>  typedef _Ptr<_Result_base> _Ptr_type;</div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span> </div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  enum _Status : unsigned {</div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  __not_ready,</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  __ready</div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  };</div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span> </div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  _Ptr_type _M_result;</div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  __atomic_futex_unsigned<> _M_status;</div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  atomic_flag _M_retrieved = ATOMIC_FLAG_INIT;</div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  once_flag _M_once;</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>  public:</div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  _State_baseV2() noexcept : _M_result(), _M_status(_Status::__not_ready)</div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  { }</div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  _State_baseV2(const _State_baseV2&) = delete;</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  _State_baseV2& operator=(const _State_baseV2&) = delete;</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  virtual ~_State_baseV2() = default;</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>  _Result_base&</div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  wait()</div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  {</div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  // Run any deferred function or join any asynchronous thread:</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  _M_complete_async();</div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  // Acquire MO makes sure this synchronizes with the thread that made</div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  // the future ready.</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  _M_status._M_load_when_equal(_Status::__ready, memory_order_acquire);</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  return *_M_result;</div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  }</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>  template<typename _Rep, typename _Period></div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  future_status</div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  wait_for(const chrono::duration<_Rep, _Period>& __rel)</div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  {</div><div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  // First, check if the future has been made ready. Use acquire MO</div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  // to synchronize with the thread that made it ready.</div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  if (_M_status._M_load(memory_order_acquire) == _Status::__ready)</div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  return future_status::ready;</div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  if (_M_is_deferred_future())</div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  return future_status::deferred;</div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  if (_M_status._M_load_when_equal_for(_Status::__ready,</div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  memory_order_acquire, __rel))</div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  {</div><div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  // _GLIBCXX_RESOLVE_LIB_DEFECTS</div><div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  // 2100. timed waiting functions must also join</div><div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  // This call is a no-op by default except on an async future,</div><div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  // in which case the async thread is joined. It's also not a</div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  // no-op for a deferred future, but such a future will never</div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  // reach this point because it returns future_status::deferred</div><div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  // instead of waiting for the future to become ready (see</div><div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  // above). Async futures synchronize in this call, so we need</div><div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  // no further synchronization here.</div><div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  _M_complete_async();</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>  return future_status::ready;</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>  return future_status::timeout;</div><div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  }</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>  template<typename _Clock, typename _Duration></div><div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  future_status</div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  wait_until(const chrono::time_point<_Clock, _Duration>& __abs)</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>  // First, check if the future has been made ready. Use acquire MO</div><div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  // to synchronize with the thread that made it ready.</div><div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  if (_M_status._M_load(memory_order_acquire) == _Status::__ready)</div><div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  return future_status::ready;</div><div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  if (_M_is_deferred_future())</div><div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  return future_status::deferred;</div><div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  if (_M_status._M_load_when_equal_until(_Status::__ready,</div><div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  memory_order_acquire, __abs))</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>  // _GLIBCXX_RESOLVE_LIB_DEFECTS</div><div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  // 2100. timed waiting functions must also join</div><div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  // See wait_for(...) above.</div><div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  _M_complete_async();</div><div class="line"><a name="l00387"></a><span class="lineno"> 387</span> </div><div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  return future_status::ready;</div><div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  }</div><div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  return future_status::timeout;</div><div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  }</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>  // Provide a result to the shared state and make it ready.</div><div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  // Calls at most once: _M_result = __res();</div><div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  void</div><div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  _M_set_result(function<_Ptr_type()> __res, bool __ignore_failure = false)</div><div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  {</div><div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  bool __did_set = false;</div><div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  // all calls to this function are serialized,</div><div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  // side-effects of invoking __res only happen once</div><div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  call_once(_M_once, &_State_baseV2::_M_do_set, this,</div><div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  std::__addressof(__res), std::__addressof(__did_set));</div><div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  if (__did_set)</div><div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  // Use release MO to synchronize with observers of the ready state.</div><div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  _M_status._M_store_notify_all(_Status::__ready,</div><div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  memory_order_release);</div><div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  else if (!__ignore_failure)</div><div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  __throw_future_error(int(future_errc::promise_already_satisfied));</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> </div><div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  // Provide a result to the shared state but delay making it ready</div><div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  // until the calling thread exits.</div><div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  // Calls at most once: _M_result = __res();</div><div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  void</div><div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  _M_set_delayed_result(function<_Ptr_type()> __res,</div><div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  weak_ptr<_State_baseV2> __self)</div><div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  {</div><div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  bool __did_set = false;</div><div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  unique_ptr<_Make_ready> __mr{new _Make_ready};</div><div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  // all calls to this function are serialized,</div><div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  // side-effects of invoking __res only happen once</div><div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  call_once(_M_once, &_State_baseV2::_M_do_set, this,</div><div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  std::__addressof(__res), std::__addressof(__did_set));</div><div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  if (!__did_set)</div><div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  __throw_future_error(int(future_errc::promise_already_satisfied));</div><div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  __mr->_M_shared_state = std::move(__self);</div><div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  __mr->_M_set();</div><div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  __mr.release();</div><div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  }</div><div class="line"><a name="l00430"></a><span class="lineno"> 430</span> </div><div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  // Abandon this shared state.</div><div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  void</div><div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  _M_break_promise(_Ptr_type __res)</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>  if (static_cast<bool>(__res))</div><div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  {</div><div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  __res->_M_error =</div><div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  make_exception_ptr(future_error(future_errc::broken_promise));</div><div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  // This function is only called when the last asynchronous result</div><div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  // provider is abandoning this shared state, so noone can be</div><div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  // trying to make the shared state ready at the same time, and</div><div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  // we can access _M_result directly instead of through call_once.</div><div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  _M_result.swap(__res);</div><div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  // Use release MO to synchronize with observers of the ready state.</div><div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  _M_status._M_store_notify_all(_Status::__ready,</div><div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  memory_order_release);</div><div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  }</div><div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  }</div><div class="line"><a name="l00449"></a><span class="lineno"> 449</span> </div><div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  // Called when this object is first passed to a future.</div><div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  void</div><div class="line"><a name="l00452"></a><span class="lineno"> 452</span>  _M_set_retrieved_flag()</div><div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  {</div><div class="line"><a name="l00454"></a><span class="lineno"> 454</span>  if (_M_retrieved.test_and_set())</div><div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  __throw_future_error(int(future_errc::future_already_retrieved));</div><div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  }</div><div class="line"><a name="l00457"></a><span class="lineno"> 457</span> </div><div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  template<typename _Res, typename _Arg></div><div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  struct _Setter;</div><div class="line"><a name="l00460"></a><span class="lineno"> 460</span> </div><div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  // set lvalues</div><div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  template<typename _Res, typename _Arg></div><div class="line"><a name="l00463"></a><span class="lineno"> 463</span>  struct _Setter<_Res, _Arg&></div><div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  {</div><div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  // check this is only used by promise<R>::set_value(const R&)</div><div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  // or promise<R&>::set_value(R&)</div><div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  static_assert(is_same<_Res, _Arg&>::value // promise<R&></div><div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  || is_same<const _Res, _Arg>::value, // promise<R></div><div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  "Invalid specialisation");</div><div class="line"><a name="l00470"></a><span class="lineno"> 470</span> </div><div class="line"><a name="l00471"></a><span class="lineno"> 471</span>  // Used by std::promise to copy construct the result.</div><div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  typename promise<_Res>::_Ptr_type operator()() const</div><div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  {</div><div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  _M_promise->_M_storage->_M_set(*_M_arg);</div><div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  return std::move(_M_promise->_M_storage);</div><div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  }</div><div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  promise<_Res>* _M_promise;</div><div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  _Arg* _M_arg;</div><div class="line"><a name="l00479"></a><span class="lineno"> 479</span>  };</div><div class="line"><a name="l00480"></a><span class="lineno"> 480</span> </div><div class="line"><a name="l00481"></a><span class="lineno"> 481</span>  // set rvalues</div><div class="line"><a name="l00482"></a><span class="lineno"> 482</span>  template<typename _Res></div><div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  struct _Setter<_Res, _Res&&></div><div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  {</div><div class="line"><a name="l00485"></a><span class="lineno"> 485</span>  // Used by std::promise to move construct the result.</div><div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  typename promise<_Res>::_Ptr_type operator()() const</div><div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  {</div><div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  _M_promise->_M_storage->_M_set(std::move(*_M_arg));</div><div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  return std::move(_M_promise->_M_storage);</div><div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  }</div><div class="line"><a name="l00491"></a><span class="lineno"> 491</span>  promise<_Res>* _M_promise;</div><div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  _Res* _M_arg;</div><div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  };</div><div class="line"><a name="l00494"></a><span class="lineno"> 494</span> </div><div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  // set void</div><div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  template<typename _Res></div><div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  struct _Setter<_Res, void></div><div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  {</div><div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  static_assert(is_void<_Res>::value, "Only used for promise<void>");</div><div class="line"><a name="l00500"></a><span class="lineno"> 500</span> </div><div class="line"><a name="l00501"></a><span class="lineno"> 501</span>  typename promise<_Res>::_Ptr_type operator()() const</div><div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  { return std::move(_M_promise->_M_storage); }</div><div class="line"><a name="l00503"></a><span class="lineno"> 503</span> </div><div class="line"><a name="l00504"></a><span class="lineno"> 504</span>  promise<_Res>* _M_promise;</div><div class="line"><a name="l00505"></a><span class="lineno"> 505</span>  };</div><div class="line"><a name="l00506"></a><span class="lineno"> 506</span> </div><div class="line"><a name="l00507"></a><span class="lineno"> 507</span>  struct __exception_ptr_tag { };</div><div class="line"><a name="l00508"></a><span class="lineno"> 508</span> </div><div class="line"><a name="l00509"></a><span class="lineno"> 509</span>  // set exceptions</div><div class="line"><a name="l00510"></a><span class="lineno"> 510</span>  template<typename _Res></div><div class="line"><a name="l00511"></a><span class="lineno"> 511</span>  struct _Setter<_Res, __exception_ptr_tag></div><div class="line"><a name="l00512"></a><span class="lineno"> 512</span>  {</div><div class="line"><a name="l00513"></a><span class="lineno"> 513</span>  // Used by std::promise to store an exception as the result.</div><div class="line"><a name="l00514"></a><span class="lineno"> 514</span>  typename promise<_Res>::_Ptr_type operator()() const</div><div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  {</div><div class="line"><a name="l00516"></a><span class="lineno"> 516</span>  _M_promise->_M_storage->_M_error = *_M_ex;</div><div class="line"><a name="l00517"></a><span class="lineno"> 517</span>  return std::move(_M_promise->_M_storage);</div><div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  }</div><div class="line"><a name="l00519"></a><span class="lineno"> 519</span> </div><div class="line"><a name="l00520"></a><span class="lineno"> 520</span>  promise<_Res>* _M_promise;</div><div class="line"><a name="l00521"></a><span class="lineno"> 521</span>  exception_ptr* _M_ex;</div><div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  };</div><div class="line"><a name="l00523"></a><span class="lineno"> 523</span> </div><div class="line"><a name="l00524"></a><span class="lineno"> 524</span>  template<typename _Res, typename _Arg></div><div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  static _Setter<_Res, _Arg&&></div><div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  __setter(promise<_Res>* __prom, _Arg&& __arg)</div><div class="line"><a name="l00527"></a><span class="lineno"> 527</span>  {</div><div class="line"><a name="l00528"></a><span class="lineno"> 528</span>  _S_check(__prom->_M_future);</div><div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  return _Setter<_Res, _Arg&&>{ __prom, std::__addressof(__arg) };</div><div class="line"><a name="l00530"></a><span class="lineno"> 530</span>  }</div><div class="line"><a name="l00531"></a><span class="lineno"> 531</span> </div><div class="line"><a name="l00532"></a><span class="lineno"> 532</span>  template<typename _Res></div><div class="line"><a name="l00533"></a><span class="lineno"> 533</span>  static _Setter<_Res, __exception_ptr_tag></div><div class="line"><a name="l00534"></a><span class="lineno"> 534</span>  __setter(exception_ptr& __ex, promise<_Res>* __prom)</div><div class="line"><a name="l00535"></a><span class="lineno"> 535</span>  {</div><div class="line"><a name="l00536"></a><span class="lineno"> 536</span>  _S_check(__prom->_M_future);</div><div class="line"><a name="l00537"></a><span class="lineno"> 537</span>  return _Setter<_Res, __exception_ptr_tag>{ __prom, &__ex };</div><div class="line"><a name="l00538"></a><span class="lineno"> 538</span>  }</div><div class="line"><a name="l00539"></a><span class="lineno"> 539</span> </div><div class="line"><a name="l00540"></a><span class="lineno"> 540</span>  template<typename _Res></div><div class="line"><a name="l00541"></a><span class="lineno"> 541</span>  static _Setter<_Res, void></div><div class="line"><a name="l00542"></a><span class="lineno"> 542</span>  __setter(promise<_Res>* __prom)</div><div class="line"><a name="l00543"></a><span class="lineno"> 543</span>  {</div><div class="line"><a name="l00544"></a><span class="lineno"> 544</span>  _S_check(__prom->_M_future);</div><div class="line"><a name="l00545"></a><span class="lineno"> 545</span>  return _Setter<_Res, void>{ __prom };</div><div class="line"><a name="l00546"></a><span class="lineno"> 546</span>  }</div><div class="line"><a name="l00547"></a><span class="lineno"> 547</span> </div><div class="line"><a name="l00548"></a><span class="lineno"> 548</span>  template<typename _Tp></div><div class="line"><a name="l00549"></a><span class="lineno"> 549</span>  static void</div><div class="line"><a name="l00550"></a><span class="lineno"> 550</span>  _S_check(const shared_ptr<_Tp>& __p)</div><div class="line"><a name="l00551"></a><span class="lineno"> 551</span>  {</div><div class="line"><a name="l00552"></a><span class="lineno"> 552</span>  if (!static_cast<bool>(__p))</div><div class="line"><a name="l00553"></a><span class="lineno"> 553</span>  __throw_future_error((int)future_errc::no_state);</div><div class="line"><a name="l00554"></a><span class="lineno"> 554</span>  }</div><div class="line"><a name="l00555"></a><span class="lineno"> 555</span> </div><div class="line"><a name="l00556"></a><span class="lineno"> 556</span>  private:</div><div class="line"><a name="l00557"></a><span class="lineno"> 557</span>  // The function invoked with std::call_once(_M_once, ...).</div><div class="line"><a name="l00558"></a><span class="lineno"> 558</span>  void</div><div class="line"><a name="l00559"></a><span class="lineno"> 559</span>  _M_do_set(function<_Ptr_type()>* __f, bool* __did_set)</div><div class="line"><a name="l00560"></a><span class="lineno"> 560</span>  {</div><div class="line"><a name="l00561"></a><span class="lineno"> 561</span>  _Ptr_type __res = (*__f)();</div><div class="line"><a name="l00562"></a><span class="lineno"> 562</span>  // Notify the caller that we did try to set; if we do not throw an</div><div class="line"><a name="l00563"></a><span class="lineno"> 563</span>  // exception, the caller will be aware that it did set (e.g., see</div><div class="line"><a name="l00564"></a><span class="lineno"> 564</span>  // _M_set_result).</div><div class="line"><a name="l00565"></a><span class="lineno"> 565</span>  *__did_set = true;</div><div class="line"><a name="l00566"></a><span class="lineno"> 566</span>  _M_result.swap(__res); // nothrow</div><div class="line"><a name="l00567"></a><span class="lineno"> 567</span>  }</div><div class="line"><a name="l00568"></a><span class="lineno"> 568</span> </div><div class="line"><a name="l00569"></a><span class="lineno"> 569</span>  // Wait for completion of async function.</div><div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  virtual void _M_complete_async() { }</div><div class="line"><a name="l00571"></a><span class="lineno"> 571</span> </div><div class="line"><a name="l00572"></a><span class="lineno"> 572</span>  // Return true if state corresponds to a deferred function.</div><div class="line"><a name="l00573"></a><span class="lineno"> 573</span>  virtual bool _M_is_deferred_future() const { return false; }</div><div class="line"><a name="l00574"></a><span class="lineno"> 574</span> </div><div class="line"><a name="l00575"></a><span class="lineno"> 575</span>  struct _Make_ready final : __at_thread_exit_elt</div><div class="line"><a name="l00576"></a><span class="lineno"> 576</span>  {</div><div class="line"><a name="l00577"></a><span class="lineno"> 577</span>  weak_ptr<_State_baseV2> _M_shared_state;</div><div class="line"><a name="l00578"></a><span class="lineno"> 578</span>  static void _S_run(void*);</div><div class="line"><a name="l00579"></a><span class="lineno"> 579</span>  void _M_set();</div><div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  };</div><div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  };</div><div class="line"><a name="l00582"></a><span class="lineno"> 582</span> </div><div class="line"><a name="l00583"></a><span class="lineno"> 583</span> #ifdef _GLIBCXX_ASYNC_ABI_COMPAT</div><div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  class _State_base;</div><div class="line"><a name="l00585"></a><span class="lineno"> 585</span>  class _Async_state_common;</div><div class="line"><a name="l00586"></a><span class="lineno"> 586</span> #else</div><div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  using _State_base = _State_baseV2;</div><div class="line"><a name="l00588"></a><span class="lineno"> 588</span>  class _Async_state_commonV2;</div><div class="line"><a name="l00589"></a><span class="lineno"> 589</span> #endif</div><div class="line"><a name="l00590"></a><span class="lineno"> 590</span> </div><div class="line"><a name="l00591"></a><span class="lineno"> 591</span>  template<typename _BoundFn,</div><div class="line"><a name="l00592"></a><span class="lineno"> 592</span>  typename _Res = decltype(std::declval<_BoundFn&>()())></div><div class="line"><a name="l00593"></a><span class="lineno"> 593</span>  class _Deferred_state;</div><div class="line"><a name="l00594"></a><span class="lineno"> 594</span> </div><div class="line"><a name="l00595"></a><span class="lineno"> 595</span>  template<typename _BoundFn,</div><div class="line"><a name="l00596"></a><span class="lineno"> 596</span>  typename _Res = decltype(std::declval<_BoundFn&>()())></div><div class="line"><a name="l00597"></a><span class="lineno"> 597</span>  class _Async_state_impl;</div><div class="line"><a name="l00598"></a><span class="lineno"> 598</span> </div><div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  template<typename _Signature></div><div class="line"><a name="l00600"></a><span class="lineno"> 600</span>  class _Task_state_base;</div><div class="line"><a name="l00601"></a><span class="lineno"> 601</span> </div><div class="line"><a name="l00602"></a><span class="lineno"> 602</span>  template<typename _Fn, typename _Alloc, typename _Signature></div><div class="line"><a name="l00603"></a><span class="lineno"> 603</span>  class _Task_state;</div><div class="line"><a name="l00604"></a><span class="lineno"> 604</span> </div><div class="line"><a name="l00605"></a><span class="lineno"> 605</span>  template<typename _BoundFn></div><div class="line"><a name="l00606"></a><span class="lineno"> 606</span>  static std::shared_ptr<_State_base></div><div class="line"><a name="l00607"></a><span class="lineno"> 607</span>  _S_make_deferred_state(_BoundFn&& __fn);</div><div class="line"><a name="l00608"></a><span class="lineno"> 608</span> </div><div class="line"><a name="l00609"></a><span class="lineno"> 609</span>  template<typename _BoundFn></div><div class="line"><a name="l00610"></a><span class="lineno"> 610</span>  static std::shared_ptr<_State_base></div><div class="line"><a name="l00611"></a><span class="lineno"> 611</span>  _S_make_async_state(_BoundFn&& __fn);</div><div class="line"><a name="l00612"></a><span class="lineno"> 612</span> </div><div class="line"><a name="l00613"></a><span class="lineno"> 613</span>  template<typename _Res_ptr, typename _Fn,</div><div class="line"><a name="l00614"></a><span class="lineno"> 614</span>  typename _Res = typename _Res_ptr::element_type::result_type></div><div class="line"><a name="l00615"></a><span class="lineno"> 615</span>  struct _Task_setter;</div><div class="line"><a name="l00616"></a><span class="lineno"> 616</span> </div><div class="line"><a name="l00617"></a><span class="lineno"> 617</span>  template<typename _Res_ptr, typename _BoundFn></div><div class="line"><a name="l00618"></a><span class="lineno"> 618</span>  static _Task_setter<_Res_ptr, _BoundFn></div><div class="line"><a name="l00619"></a><span class="lineno"> 619</span>  _S_task_setter(_Res_ptr& __ptr, _BoundFn& __call)</div><div class="line"><a name="l00620"></a><span class="lineno"> 620</span>  {</div><div class="line"><a name="l00621"></a><span class="lineno"> 621</span>  return { std::__addressof(__ptr), std::__addressof(__call) };</div><div class="line"><a name="l00622"></a><span class="lineno"> 622</span>  }</div><div class="line"><a name="l00623"></a><span class="lineno"> 623</span>  };</div><div class="line"><a name="l00624"></a><span class="lineno"> 624</span> </div><div class="line"><a name="l00625"></a><span class="lineno"> 625</span>  /// Partial specialization for reference types.</div><div class="line"><a name="l00626"></a><span class="lineno"> 626</span>  template<typename _Res></div><div class="line"><a name="l00627"></a><span class="lineno"> 627</span>  struct __future_base::_Result<_Res&> : __future_base::_Result_base</div><div class="line"><a name="l00628"></a><span class="lineno"> 628</span>  {</div><div class="line"><a name="l00629"></a><span class="lineno"> 629</span>  typedef _Res& result_type;</div><div class="line"><a name="l00630"></a><span class="lineno"> 630</span> </div><div class="line"><a name="l00631"></a><span class="lineno"> 631</span>  _Result() noexcept : _M_value_ptr() { }</div><div class="line"><a name="l00632"></a><span class="lineno"> 632</span> </div><div class="line"><a name="l00633"></a><span class="lineno"> 633</span>  void</div><div class="line"><a name="l00634"></a><span class="lineno"> 634</span>  _M_set(_Res& __res) noexcept</div><div class="line"><a name="l00635"></a><span class="lineno"> 635</span>  { _M_value_ptr = std::addressof(__res); }</div><div class="line"><a name="l00636"></a><span class="lineno"> 636</span> </div><div class="line"><a name="l00637"></a><span class="lineno"> 637</span>  _Res& _M_get() noexcept { return *_M_value_ptr; }</div><div class="line"><a name="l00638"></a><span class="lineno"> 638</span> </div><div class="line"><a name="l00639"></a><span class="lineno"> 639</span>  private:</div><div class="line"><a name="l00640"></a><span class="lineno"> 640</span>  _Res* _M_value_ptr;</div><div class="line"><a name="l00641"></a><span class="lineno"> 641</span> </div><div class="line"><a name="l00642"></a><span class="lineno"> 642</span>  void _M_destroy() { delete this; }</div><div class="line"><a name="l00643"></a><span class="lineno"> 643</span>  };</div><div class="line"><a name="l00644"></a><span class="lineno"> 644</span> </div><div class="line"><a name="l00645"></a><span class="lineno"> 645</span>  /// Explicit specialization for void.</div><div class="line"><a name="l00646"></a><span class="lineno"> 646</span>  template<></div><div class="line"><a name="l00647"></a><span class="lineno"> 647</span>  struct __future_base::_Result<void> : __future_base::_Result_base</div><div class="line"><a name="l00648"></a><span class="lineno"> 648</span>  {</div><div class="line"><a name="l00649"></a><span class="lineno"> 649</span>  typedef void result_type;</div><div class="line"><a name="l00650"></a><span class="lineno"> 650</span> </div><div class="line"><a name="l00651"></a><span class="lineno"> 651</span>  private:</div><div class="line"><a name="l00652"></a><span class="lineno"> 652</span>  void _M_destroy() { delete this; }</div><div class="line"><a name="l00653"></a><span class="lineno"> 653</span>  };</div><div class="line"><a name="l00654"></a><span class="lineno"> 654</span> </div><div class="line"><a name="l00655"></a><span class="lineno"> 655</span> #ifndef _GLIBCXX_ASYNC_ABI_COMPAT</div><div class="line"><a name="l00656"></a><span class="lineno"> 656</span> </div><div class="line"><a name="l00657"></a><span class="lineno"> 657</span>  // Allow _Setter objects to be stored locally in std::function</div><div class="line"><a name="l00658"></a><span class="lineno"> 658</span>  template<typename _Res, typename _Arg></div><div class="line"><a name="l00659"></a><span class="lineno"> 659</span>  struct __is_location_invariant</div><div class="line"><a name="l00660"></a><span class="lineno"> 660</span>  <__future_base::_State_base::_Setter<_Res, _Arg>></div><div class="line"><a name="l00661"></a><span class="lineno"> 661</span>  : true_type { };</div><div class="line"><a name="l00662"></a><span class="lineno"> 662</span> </div><div class="line"><a name="l00663"></a><span class="lineno"> 663</span>  // Allow _Task_setter objects to be stored locally in std::function</div><div class="line"><a name="l00664"></a><span class="lineno"> 664</span>  template<typename _Res_ptr, typename _Fn, typename _Res></div><div class="line"><a name="l00665"></a><span class="lineno"> 665</span>  struct __is_location_invariant</div><div class="line"><a name="l00666"></a><span class="lineno"> 666</span>  <__future_base::_Task_setter<_Res_ptr, _Fn, _Res>></div><div class="line"><a name="l00667"></a><span class="lineno"> 667</span>  : true_type { };</div><div class="line"><a name="l00668"></a><span class="lineno"> 668</span> </div><div class="line"><a name="l00669"></a><span class="lineno"> 669</span>  /// Common implementation for future and shared_future.</div><div class="line"><a name="l00670"></a><span class="lineno"> 670</span>  template<typename _Res></div><div class="line"><a name="l00671"></a><span class="lineno"> 671</span>  class __basic_future : public __future_base</div><div class="line"><a name="l00672"></a><span class="lineno"> 672</span>  {</div><div class="line"><a name="l00673"></a><span class="lineno"> 673</span>  protected:</div><div class="line"><a name="l00674"></a><span class="lineno"> 674</span>  typedef shared_ptr<_State_base> __state_type;</div><div class="line"><a name="l00675"></a><span class="lineno"> 675</span>  typedef __future_base::_Result<_Res>& __result_type;</div><div class="line"><a name="l00676"></a><span class="lineno"> 676</span> </div><div class="line"><a name="l00677"></a><span class="lineno"> 677</span>  private:</div><div class="line"><a name="l00678"></a><span class="lineno"> 678</span>  __state_type _M_state;</div><div class="line"><a name="l00679"></a><span class="lineno"> 679</span> </div><div class="line"><a name="l00680"></a><span class="lineno"> 680</span>  public:</div><div class="line"><a name="l00681"></a><span class="lineno"> 681</span>  // Disable copying.</div><div class="line"><a name="l00682"></a><span class="lineno"> 682</span>  __basic_future(const __basic_future&) = delete;</div><div class="line"><a name="l00683"></a><span class="lineno"> 683</span>  __basic_future& operator=(const __basic_future&) = delete;</div><div class="line"><a name="l00684"></a><span class="lineno"> 684</span> </div><div class="line"><a name="l00685"></a><span class="lineno"> 685</span>  bool</div><div class="line"><a name="l00686"></a><span class="lineno"> 686</span>  valid() const noexcept { return static_cast<bool>(_M_state); }</div><div class="line"><a name="l00687"></a><span class="lineno"> 687</span> </div><div class="line"><a name="l00688"></a><span class="lineno"> 688</span>  void</div><div class="line"><a name="l00689"></a><span class="lineno"> 689</span>  wait() const</div><div class="line"><a name="l00690"></a><span class="lineno"> 690</span>  {</div><div class="line"><a name="l00691"></a><span class="lineno"> 691</span>  _State_base::_S_check(_M_state);</div><div class="line"><a name="l00692"></a><span class="lineno"> 692</span>  _M_state->wait();</div><div class="line"><a name="l00693"></a><span class="lineno"> 693</span>  }</div><div class="line"><a name="l00694"></a><span class="lineno"> 694</span> </div><div class="line"><a name="l00695"></a><span class="lineno"> 695</span>  template<typename _Rep, typename _Period></div><div class="line"><a name="l00696"></a><span class="lineno"> 696</span>  future_status</div><div class="line"><a name="l00697"></a><span class="lineno"> 697</span>  wait_for(const chrono::duration<_Rep, _Period>& __rel) const</div><div class="line"><a name="l00698"></a><span class="lineno"> 698</span>  {</div><div class="line"><a name="l00699"></a><span class="lineno"> 699</span>  _State_base::_S_check(_M_state);</div><div class="line"><a name="l00700"></a><span class="lineno"> 700</span>  return _M_state->wait_for(__rel);</div><div class="line"><a name="l00701"></a><span class="lineno"> 701</span>  }</div><div class="line"><a name="l00702"></a><span class="lineno"> 702</span> </div><div class="line"><a name="l00703"></a><span class="lineno"> 703</span>  template<typename _Clock, typename _Duration></div><div class="line"><a name="l00704"></a><span class="lineno"> 704</span>  future_status</div><div class="line"><a name="l00705"></a><span class="lineno"> 705</span>  wait_until(const chrono::time_point<_Clock, _Duration>& __abs) const</div><div class="line"><a name="l00706"></a><span class="lineno"> 706</span>  {</div><div class="line"><a name="l00707"></a><span class="lineno"> 707</span>  _State_base::_S_check(_M_state);</div><div class="line"><a name="l00708"></a><span class="lineno"> 708</span>  return _M_state->wait_until(__abs);</div><div class="line"><a name="l00709"></a><span class="lineno"> 709</span>  }</div><div class="line"><a name="l00710"></a><span class="lineno"> 710</span> </div><div class="line"><a name="l00711"></a><span class="lineno"> 711</span>  protected:</div><div class="line"><a name="l00712"></a><span class="lineno"> 712</span>  /// Wait for the state to be ready and rethrow any stored exception</div><div class="line"><a name="l00713"></a><span class="lineno"> 713</span>  __result_type</div><div class="line"><a name="l00714"></a><span class="lineno"> 714</span>  _M_get_result() const</div><div class="line"><a name="l00715"></a><span class="lineno"> 715</span>  {</div><div class="line"><a name="l00716"></a><span class="lineno"> 716</span>  _State_base::_S_check(_M_state);</div><div class="line"><a name="l00717"></a><span class="lineno"> 717</span>  _Result_base& __res = _M_state->wait();</div><div class="line"><a name="l00718"></a><span class="lineno"> 718</span>  if (!(__res._M_error == 0))</div><div class="line"><a name="l00719"></a><span class="lineno"> 719</span>  rethrow_exception(__res._M_error);</div><div class="line"><a name="l00720"></a><span class="lineno"> 720</span>  return static_cast<__result_type>(__res);</div><div class="line"><a name="l00721"></a><span class="lineno"> 721</span>  }</div><div class="line"><a name="l00722"></a><span class="lineno"> 722</span> </div><div class="line"><a name="l00723"></a><span class="lineno"> 723</span>  void _M_swap(__basic_future& __that) noexcept</div><div class="line"><a name="l00724"></a><span class="lineno"> 724</span>  {</div><div class="line"><a name="l00725"></a><span class="lineno"> 725</span>  _M_state.swap(__that._M_state);</div><div class="line"><a name="l00726"></a><span class="lineno"> 726</span>  }</div><div class="line"><a name="l00727"></a><span class="lineno"> 727</span> </div><div class="line"><a name="l00728"></a><span class="lineno"> 728</span>  // Construction of a future by promise::get_future()</div><div class="line"><a name="l00729"></a><span class="lineno"> 729</span>  explicit</div><div class="line"><a name="l00730"></a><span class="lineno"> 730</span>  __basic_future(const __state_type& __state) : _M_state(__state)</div><div class="line"><a name="l00731"></a><span class="lineno"> 731</span>  {</div><div class="line"><a name="l00732"></a><span class="lineno"> 732</span>  _State_base::_S_check(_M_state);</div><div class="line"><a name="l00733"></a><span class="lineno"> 733</span>  _M_state->_M_set_retrieved_flag();</div><div class="line"><a name="l00734"></a><span class="lineno"> 734</span>  }</div><div class="line"><a name="l00735"></a><span class="lineno"> 735</span> </div><div class="line"><a name="l00736"></a><span class="lineno"> 736</span>  // Copy construction from a shared_future</div><div class="line"><a name="l00737"></a><span class="lineno"> 737</span>  explicit</div><div class="line"><a name="l00738"></a><span class="lineno"> 738</span>  __basic_future(const shared_future<_Res>&) noexcept;</div><div class="line"><a name="l00739"></a><span class="lineno"> 739</span> </div><div class="line"><a name="l00740"></a><span class="lineno"> 740</span>  // Move construction from a shared_future</div><div class="line"><a name="l00741"></a><span class="lineno"> 741</span>  explicit</div><div class="line"><a name="l00742"></a><span class="lineno"> 742</span>  __basic_future(shared_future<_Res>&&) noexcept;</div><div class="line"><a name="l00743"></a><span class="lineno"> 743</span> </div><div class="line"><a name="l00744"></a><span class="lineno"> 744</span>  // Move construction from a future</div><div class="line"><a name="l00745"></a><span class="lineno"> 745</span>  explicit</div><div class="line"><a name="l00746"></a><span class="lineno"> 746</span>  __basic_future(future<_Res>&&) noexcept;</div><div class="line"><a name="l00747"></a><span class="lineno"> 747</span> </div><div class="line"><a name="l00748"></a><span class="lineno"> 748</span>  constexpr __basic_future() noexcept : _M_state() { }</div><div class="line"><a name="l00749"></a><span class="lineno"> 749</span> </div><div class="line"><a name="l00750"></a><span class="lineno"> 750</span>  struct _Reset</div><div class="line"><a name="l00751"></a><span class="lineno"> 751</span>  {</div><div class="line"><a name="l00752"></a><span class="lineno"> 752</span>  explicit _Reset(__basic_future& __fut) noexcept : _M_fut(__fut) { }</div><div class="line"><a name="l00753"></a><span class="lineno"> 753</span>  ~_Reset() { _M_fut._M_state.reset(); }</div><div class="line"><a name="l00754"></a><span class="lineno"> 754</span>  __basic_future& _M_fut;</div><div class="line"><a name="l00755"></a><span class="lineno"> 755</span>  };</div><div class="line"><a name="l00756"></a><span class="lineno"> 756</span>  };</div><div class="line"><a name="l00757"></a><span class="lineno"> 757</span> </div><div class="line"><a name="l00758"></a><span class="lineno"> 758</span> </div><div class="line"><a name="l00759"></a><span class="lineno"> 759</span>  /// Primary template for future.</div><div class="line"><a name="l00760"></a><span class="lineno"> 760</span>  template<typename _Res></div><div class="line"><a name="l00761"></a><span class="lineno"> 761</span>  class future : public __basic_future<_Res></div><div class="line"><a name="l00762"></a><span class="lineno"> 762</span>  {</div><div class="line"><a name="l00763"></a><span class="lineno"> 763</span>  friend class promise<_Res>;</div><div class="line"><a name="l00764"></a><span class="lineno"> 764</span>  template<typename> friend class packaged_task;</div><div class="line"><a name="l00765"></a><span class="lineno"> 765</span>  template<typename _Fn, typename... _Args></div><div class="line"><a name="l00766"></a><span class="lineno"> 766</span>  friend future<__async_result_of<_Fn, _Args...>></div><div class="line"><a name="l00767"></a><span class="lineno"> 767</span>  async(launch, _Fn&&, _Args&&...);</div><div class="line"><a name="l00768"></a><span class="lineno"> 768</span> </div><div class="line"><a name="l00769"></a><span class="lineno"> 769</span>  typedef __basic_future<_Res> _Base_type;</div><div class="line"><a name="l00770"></a><span class="lineno"> 770</span>  typedef typename _Base_type::__state_type __state_type;</div><div class="line"><a name="l00771"></a><span class="lineno"> 771</span> </div><div class="line"><a name="l00772"></a><span class="lineno"> 772</span>  explicit</div><div class="line"><a name="l00773"></a><span class="lineno"> 773</span>  future(const __state_type& __state) : _Base_type(__state) { }</div><div class="line"><a name="l00774"></a><span class="lineno"> 774</span> </div><div class="line"><a name="l00775"></a><span class="lineno"> 775</span>  public:</div><div class="line"><a name="l00776"></a><span class="lineno"> 776</span>  constexpr future() noexcept : _Base_type() { }</div><div class="line"><a name="l00777"></a><span class="lineno"> 777</span> </div><div class="line"><a name="l00778"></a><span class="lineno"> 778</span>  /// Move constructor</div><div class="line"><a name="l00779"></a><span class="lineno"> 779</span>  future(future&& __uf) noexcept : _Base_type(std::move(__uf)) { }</div><div class="line"><a name="l00780"></a><span class="lineno"> 780</span> </div><div class="line"><a name="l00781"></a><span class="lineno"> 781</span>  // Disable copying</div><div class="line"><a name="l00782"></a><span class="lineno"> 782</span>  future(const future&) = delete;</div><div class="line"><a name="l00783"></a><span class="lineno"> 783</span>  future& operator=(const future&) = delete;</div><div class="line"><a name="l00784"></a><span class="lineno"> 784</span> </div><div class="line"><a name="l00785"></a><span class="lineno"> 785</span>  future& operator=(future&& __fut) noexcept</div><div class="line"><a name="l00786"></a><span class="lineno"> 786</span>  {</div><div class="line"><a name="l00787"></a><span class="lineno"> 787</span>  future(std::move(__fut))._M_swap(*this);</div><div class="line"><a name="l00788"></a><span class="lineno"> 788</span>  return *this;</div><div class="line"><a name="l00789"></a><span class="lineno"> 789</span>  }</div><div class="line"><a name="l00790"></a><span class="lineno"> 790</span> </div><div class="line"><a name="l00791"></a><span class="lineno"> 791</span>  /// Retrieving the value</div><div class="line"><a name="l00792"></a><span class="lineno"> 792</span>  _Res</div><div class="line"><a name="l00793"></a><span class="lineno"> 793</span>  get()</div><div class="line"><a name="l00794"></a><span class="lineno"> 794</span>  {</div><div class="line"><a name="l00795"></a><span class="lineno"> 795</span>  typename _Base_type::_Reset __reset(*this);</div><div class="line"><a name="l00796"></a><span class="lineno"> 796</span>  return std::move(this->_M_get_result()._M_value());</div><div class="line"><a name="l00797"></a><span class="lineno"> 797</span>  }</div><div class="line"><a name="l00798"></a><span class="lineno"> 798</span> </div><div class="line"><a name="l00799"></a><span class="lineno"> 799</span>  shared_future<_Res> share() noexcept;</div><div class="line"><a name="l00800"></a><span class="lineno"> 800</span>  };</div><div class="line"><a name="l00801"></a><span class="lineno"> 801</span> </div><div class="line"><a name="l00802"></a><span class="lineno"> 802</span>  /// Partial specialization for future<R&></div><div class="line"><a name="l00803"></a><span class="lineno"> 803</span>  template<typename _Res></div><div class="line"><a name="l00804"></a><span class="lineno"> 804</span>  class future<_Res&> : public __basic_future<_Res&></div><div class="line"><a name="l00805"></a><span class="lineno"> 805</span>  {</div><div class="line"><a name="l00806"></a><span class="lineno"> 806</span>  friend class promise<_Res&>;</div><div class="line"><a name="l00807"></a><span class="lineno"> 807</span>  template<typename> friend class packaged_task;</div><div class="line"><a name="l00808"></a><span class="lineno"> 808</span>  template<typename _Fn, typename... _Args></div><div class="line"><a name="l00809"></a><span class="lineno"> 809</span>  friend future<__async_result_of<_Fn, _Args...>></div><div class="line"><a name="l00810"></a><span class="lineno"> 810</span>  async(launch, _Fn&&, _Args&&...);</div><div class="line"><a name="l00811"></a><span class="lineno"> 811</span> </div><div class="line"><a name="l00812"></a><span class="lineno"> 812</span>  typedef __basic_future<_Res&> _Base_type;</div><div class="line"><a name="l00813"></a><span class="lineno"> 813</span>  typedef typename _Base_type::__state_type __state_type;</div><div class="line"><a name="l00814"></a><span class="lineno"> 814</span> </div><div class="line"><a name="l00815"></a><span class="lineno"> 815</span>  explicit</div><div class="line"><a name="l00816"></a><span class="lineno"> 816</span>  future(const __state_type& __state) : _Base_type(__state) { }</div><div class="line"><a name="l00817"></a><span class="lineno"> 817</span> </div><div class="line"><a name="l00818"></a><span class="lineno"> 818</span>  public:</div><div class="line"><a name="l00819"></a><span class="lineno"> 819</span>  constexpr future() noexcept : _Base_type() { }</div><div class="line"><a name="l00820"></a><span class="lineno"> 820</span> </div><div class="line"><a name="l00821"></a><span class="lineno"> 821</span>  /// Move constructor</div><div class="line"><a name="l00822"></a><span class="lineno"> 822</span>  future(future&& __uf) noexcept : _Base_type(std::move(__uf)) { }</div><div class="line"><a name="l00823"></a><span class="lineno"> 823</span> </div><div class="line"><a name="l00824"></a><span class="lineno"> 824</span>  // Disable copying</div><div class="line"><a name="l00825"></a><span class="lineno"> 825</span>  future(const future&) = delete;</div><div class="line"><a name="l00826"></a><span class="lineno"> 826</span>  future& operator=(const future&) = delete;</div><div class="line"><a name="l00827"></a><span class="lineno"> 827</span> </div><div class="line"><a name="l00828"></a><span class="lineno"> 828</span>  future& operator=(future&& __fut) noexcept</div><div class="line"><a name="l00829"></a><span class="lineno"> 829</span>  {</div><div class="line"><a name="l00830"></a><span class="lineno"> 830</span>  future(std::move(__fut))._M_swap(*this);</div><div class="line"><a name="l00831"></a><span class="lineno"> 831</span>  return *this;</div><div class="line"><a name="l00832"></a><span class="lineno"> 832</span>  }</div><div class="line"><a name="l00833"></a><span class="lineno"> 833</span> </div><div class="line"><a name="l00834"></a><span class="lineno"> 834</span>  /// Retrieving the value</div><div class="line"><a name="l00835"></a><span class="lineno"> 835</span>  _Res&</div><div class="line"><a name="l00836"></a><span class="lineno"> 836</span>  get()</div><div class="line"><a name="l00837"></a><span class="lineno"> 837</span>  {</div><div class="line"><a name="l00838"></a><span class="lineno"> 838</span>  typename _Base_type::_Reset __reset(*this);</div><div class="line"><a name="l00839"></a><span class="lineno"> 839</span>  return this->_M_get_result()._M_get();</div><div class="line"><a name="l00840"></a><span class="lineno"> 840</span>  }</div><div class="line"><a name="l00841"></a><span class="lineno"> 841</span> </div><div class="line"><a name="l00842"></a><span class="lineno"> 842</span>  shared_future<_Res&> share() noexcept;</div><div class="line"><a name="l00843"></a><span class="lineno"> 843</span>  };</div><div class="line"><a name="l00844"></a><span class="lineno"> 844</span> </div><div class="line"><a name="l00845"></a><span class="lineno"> 845</span>  /// Explicit specialization for future<void></div><div class="line"><a name="l00846"></a><span class="lineno"> 846</span>  template<></div><div class="line"><a name="l00847"></a><span class="lineno"> 847</span>  class future<void> : public __basic_future<void></div><div class="line"><a name="l00848"></a><span class="lineno"> 848</span>  {</div><div class="line"><a name="l00849"></a><span class="lineno"> 849</span>  friend class promise<void>;</div><div class="line"><a name="l00850"></a><span class="lineno"> 850</span>  template<typename> friend class packaged_task;</div><div class="line"><a name="l00851"></a><span class="lineno"> 851</span>  template<typename _Fn, typename... _Args></div><div class="line"><a name="l00852"></a><span class="lineno"> 852</span>  friend future<__async_result_of<_Fn, _Args...>></div><div class="line"><a name="l00853"></a><span class="lineno"> 853</span>  async(launch, _Fn&&, _Args&&...);</div><div class="line"><a name="l00854"></a><span class="lineno"> 854</span> </div><div class="line"><a name="l00855"></a><span class="lineno"> 855</span>  typedef __basic_future<void> _Base_type;</div><div class="line"><a name="l00856"></a><span class="lineno"> 856</span>  typedef typename _Base_type::__state_type __state_type;</div><div class="line"><a name="l00857"></a><span class="lineno"> 857</span> </div><div class="line"><a name="l00858"></a><span class="lineno"> 858</span>  explicit</div><div class="line"><a name="l00859"></a><span class="lineno"> 859</span>  future(const __state_type& __state) : _Base_type(__state) { }</div><div class="line"><a name="l00860"></a><span class="lineno"> 860</span> </div><div class="line"><a name="l00861"></a><span class="lineno"> 861</span>  public:</div><div class="line"><a name="l00862"></a><span class="lineno"> 862</span>  constexpr future() noexcept : _Base_type() { }</div><div class="line"><a name="l00863"></a><span class="lineno"> 863</span> </div><div class="line"><a name="l00864"></a><span class="lineno"> 864</span>  /// Move constructor</div><div class="line"><a name="l00865"></a><span class="lineno"> 865</span>  future(future&& __uf) noexcept : _Base_type(std::move(__uf)) { }</div><div class="line"><a name="l00866"></a><span class="lineno"> 866</span> </div><div class="line"><a name="l00867"></a><span class="lineno"> 867</span>  // Disable copying</div><div class="line"><a name="l00868"></a><span class="lineno"> 868</span>  future(const future&) = delete;</div><div class="line"><a name="l00869"></a><span class="lineno"> 869</span>  future& operator=(const future&) = delete;</div><div class="line"><a name="l00870"></a><span class="lineno"> 870</span> </div><div class="line"><a name="l00871"></a><span class="lineno"> 871</span>  future& operator=(future&& __fut) noexcept</div><div class="line"><a name="l00872"></a><span class="lineno"> 872</span>  {</div><div class="line"><a name="l00873"></a><span class="lineno"> 873</span>  future(std::move(__fut))._M_swap(*this);</div><div class="line"><a name="l00874"></a><span class="lineno"> 874</span>  return *this;</div><div class="line"><a name="l00875"></a><span class="lineno"> 875</span>  }</div><div class="line"><a name="l00876"></a><span class="lineno"> 876</span> </div><div class="line"><a name="l00877"></a><span class="lineno"> 877</span>  /// Retrieving the value</div><div class="line"><a name="l00878"></a><span class="lineno"> 878</span>  void</div><div class="line"><a name="l00879"></a><span class="lineno"> 879</span>  get()</div><div class="line"><a name="l00880"></a><span class="lineno"> 880</span>  {</div><div class="line"><a name="l00881"></a><span class="lineno"> 881</span>  typename _Base_type::_Reset __reset(*this);</div><div class="line"><a name="l00882"></a><span class="lineno"> 882</span>  this->_M_get_result();</div><div class="line"><a name="l00883"></a><span class="lineno"> 883</span>  }</div><div class="line"><a name="l00884"></a><span class="lineno"> 884</span> </div><div class="line"><a name="l00885"></a><span class="lineno"> 885</span>  shared_future<void> share() noexcept;</div><div class="line"><a name="l00886"></a><span class="lineno"> 886</span>  };</div><div class="line"><a name="l00887"></a><span class="lineno"> 887</span> </div><div class="line"><a name="l00888"></a><span class="lineno"> 888</span> </div><div class="line"><a name="l00889"></a><span class="lineno"> 889</span>  /// Primary template for shared_future.</div><div class="line"><a name="l00890"></a><span class="lineno"> 890</span>  template<typename _Res></div><div class="line"><a name="l00891"></a><span class="lineno"> 891</span>  class shared_future : public __basic_future<_Res></div><div class="line"><a name="l00892"></a><span class="lineno"> 892</span>  {</div><div class="line"><a name="l00893"></a><span class="lineno"> 893</span>  typedef __basic_future<_Res> _Base_type;</div><div class="line"><a name="l00894"></a><span class="lineno"> 894</span> </div><div class="line"><a name="l00895"></a><span class="lineno"> 895</span>  public:</div><div class="line"><a name="l00896"></a><span class="lineno"> 896</span>  constexpr shared_future() noexcept : _Base_type() { }</div><div class="line"><a name="l00897"></a><span class="lineno"> 897</span> </div><div class="line"><a name="l00898"></a><span class="lineno"> 898</span>  /// Copy constructor</div><div class="line"><a name="l00899"></a><span class="lineno"> 899</span>  shared_future(const shared_future& __sf) noexcept : _Base_type(__sf) { }</div><div class="line"><a name="l00900"></a><span class="lineno"> 900</span> </div><div class="line"><a name="l00901"></a><span class="lineno"> 901</span>  /// Construct from a future rvalue</div><div class="line"><a name="l00902"></a><span class="lineno"> 902</span>  shared_future(future<_Res>&& __uf) noexcept</div><div class="line"><a name="l00903"></a><span class="lineno"> 903</span>  : _Base_type(std::move(__uf))</div><div class="line"><a name="l00904"></a><span class="lineno"> 904</span>  { }</div><div class="line"><a name="l00905"></a><span class="lineno"> 905</span> </div><div class="line"><a name="l00906"></a><span class="lineno"> 906</span>  /// Construct from a shared_future rvalue</div><div class="line"><a name="l00907"></a><span class="lineno"> 907</span>  shared_future(shared_future&& __sf) noexcept</div><div class="line"><a name="l00908"></a><span class="lineno"> 908</span>  : _Base_type(std::move(__sf))</div><div class="line"><a name="l00909"></a><span class="lineno"> 909</span>  { }</div><div class="line"><a name="l00910"></a><span class="lineno"> 910</span> </div><div class="line"><a name="l00911"></a><span class="lineno"> 911</span>  shared_future& operator=(const shared_future& __sf) noexcept</div><div class="line"><a name="l00912"></a><span class="lineno"> 912</span>  {</div><div class="line"><a name="l00913"></a><span class="lineno"> 913</span>  shared_future(__sf)._M_swap(*this);</div><div class="line"><a name="l00914"></a><span class="lineno"> 914</span>  return *this;</div><div class="line"><a name="l00915"></a><span class="lineno"> 915</span>  }</div><div class="line"><a name="l00916"></a><span class="lineno"> 916</span> </div><div class="line"><a name="l00917"></a><span class="lineno"> 917</span>  shared_future& operator=(shared_future&& __sf) noexcept</div><div class="line"><a name="l00918"></a><span class="lineno"> 918</span>  {</div><div class="line"><a name="l00919"></a><span class="lineno"> 919</span>  shared_future(std::move(__sf))._M_swap(*this);</div><div class="line"><a name="l00920"></a><span class="lineno"> 920</span>  return *this;</div><div class="line"><a name="l00921"></a><span class="lineno"> 921</span>  }</div><div class="line"><a name="l00922"></a><span class="lineno"> 922</span> </div><div class="line"><a name="l00923"></a><span class="lineno"> 923</span>  /// Retrieving the value</div><div class="line"><a name="l00924"></a><span class="lineno"> 924</span>  const _Res&</div><div class="line"><a name="l00925"></a><span class="lineno"> 925</span>  get() const { return this->_M_get_result()._M_value(); }</div><div class="line"><a name="l00926"></a><span class="lineno"> 926</span>  };</div><div class="line"><a name="l00927"></a><span class="lineno"> 927</span> </div><div class="line"><a name="l00928"></a><span class="lineno"> 928</span>  /// Partial specialization for shared_future<R&></div><div class="line"><a name="l00929"></a><span class="lineno"> 929</span>  template<typename _Res></div><div class="line"><a name="l00930"></a><span class="lineno"> 930</span>  class shared_future<_Res&> : public __basic_future<_Res&></div><div class="line"><a name="l00931"></a><span class="lineno"> 931</span>  {</div><div class="line"><a name="l00932"></a><span class="lineno"> 932</span>  typedef __basic_future<_Res&> _Base_type;</div><div class="line"><a name="l00933"></a><span class="lineno"> 933</span> </div><div class="line"><a name="l00934"></a><span class="lineno"> 934</span>  public:</div><div class="line"><a name="l00935"></a><span class="lineno"> 935</span>  constexpr shared_future() noexcept : _Base_type() { }</div><div class="line"><a name="l00936"></a><span class="lineno"> 936</span> </div><div class="line"><a name="l00937"></a><span class="lineno"> 937</span>  /// Copy constructor</div><div class="line"><a name="l00938"></a><span class="lineno"> 938</span>  shared_future(const shared_future& __sf) : _Base_type(__sf) { }</div><div class="line"><a name="l00939"></a><span class="lineno"> 939</span> </div><div class="line"><a name="l00940"></a><span class="lineno"> 940</span>  /// Construct from a future rvalue</div><div class="line"><a name="l00941"></a><span class="lineno"> 941</span>  shared_future(future<_Res&>&& __uf) noexcept</div><div class="line"><a name="l00942"></a><span class="lineno"> 942</span>  : _Base_type(std::move(__uf))</div><div class="line"><a name="l00943"></a><span class="lineno"> 943</span>  { }</div><div class="line"><a name="l00944"></a><span class="lineno"> 944</span> </div><div class="line"><a name="l00945"></a><span class="lineno"> 945</span>  /// Construct from a shared_future rvalue</div><div class="line"><a name="l00946"></a><span class="lineno"> 946</span>  shared_future(shared_future&& __sf) noexcept</div><div class="line"><a name="l00947"></a><span class="lineno"> 947</span>  : _Base_type(std::move(__sf))</div><div class="line"><a name="l00948"></a><span class="lineno"> 948</span>  { }</div><div class="line"><a name="l00949"></a><span class="lineno"> 949</span> </div><div class="line"><a name="l00950"></a><span class="lineno"> 950</span>  shared_future& operator=(const shared_future& __sf)</div><div class="line"><a name="l00951"></a><span class="lineno"> 951</span>  {</div><div class="line"><a name="l00952"></a><span class="lineno"> 952</span>  shared_future(__sf)._M_swap(*this);</div><div class="line"><a name="l00953"></a><span class="lineno"> 953</span>  return *this;</div><div class="line"><a name="l00954"></a><span class="lineno"> 954</span>  }</div><div class="line"><a name="l00955"></a><span class="lineno"> 955</span> </div><div class="line"><a name="l00956"></a><span class="lineno"> 956</span>  shared_future& operator=(shared_future&& __sf) noexcept</div><div class="line"><a name="l00957"></a><span class="lineno"> 957</span>  {</div><div class="line"><a name="l00958"></a><span class="lineno"> 958</span>  shared_future(std::move(__sf))._M_swap(*this);</div><div class="line"><a name="l00959"></a><span class="lineno"> 959</span>  return *this;</div><div class="line"><a name="l00960"></a><span class="lineno"> 960</span>  }</div><div class="line"><a name="l00961"></a><span class="lineno"> 961</span> </div><div class="line"><a name="l00962"></a><span class="lineno"> 962</span>  /// Retrieving the value</div><div class="line"><a name="l00963"></a><span class="lineno"> 963</span>  _Res&</div><div class="line"><a name="l00964"></a><span class="lineno"> 964</span>  get() const { return this->_M_get_result()._M_get(); }</div><div class="line"><a name="l00965"></a><span class="lineno"> 965</span>  };</div><div class="line"><a name="l00966"></a><span class="lineno"> 966</span> </div><div class="line"><a name="l00967"></a><span class="lineno"> 967</span>  /// Explicit specialization for shared_future<void></div><div class="line"><a name="l00968"></a><span class="lineno"> 968</span>  template<></div><div class="line"><a name="l00969"></a><span class="lineno"> 969</span>  class shared_future<void> : public __basic_future<void></div><div class="line"><a name="l00970"></a><span class="lineno"> 970</span>  {</div><div class="line"><a name="l00971"></a><span class="lineno"> 971</span>  typedef __basic_future<void> _Base_type;</div><div class="line"><a name="l00972"></a><span class="lineno"> 972</span> </div><div class="line"><a name="l00973"></a><span class="lineno"> 973</span>  public:</div><div class="line"><a name="l00974"></a><span class="lineno"> 974</span>  constexpr shared_future() noexcept : _Base_type() { }</div><div class="line"><a name="l00975"></a><span class="lineno"> 975</span> </div><div class="line"><a name="l00976"></a><span class="lineno"> 976</span>  /// Copy constructor</div><div class="line"><a name="l00977"></a><span class="lineno"> 977</span>  shared_future(const shared_future& __sf) : _Base_type(__sf) { }</div><div class="line"><a name="l00978"></a><span class="lineno"> 978</span> </div><div class="line"><a name="l00979"></a><span class="lineno"> 979</span>  /// Construct from a future rvalue</div><div class="line"><a name="l00980"></a><span class="lineno"> 980</span>  shared_future(future<void>&& __uf) noexcept</div><div class="line"><a name="l00981"></a><span class="lineno"> 981</span>  : _Base_type(std::move(__uf))</div><div class="line"><a name="l00982"></a><span class="lineno"> 982</span>  { }</div><div class="line"><a name="l00983"></a><span class="lineno"> 983</span> </div><div class="line"><a name="l00984"></a><span class="lineno"> 984</span>  /// Construct from a shared_future rvalue</div><div class="line"><a name="l00985"></a><span class="lineno"> 985</span>  shared_future(shared_future&& __sf) noexcept</div><div class="line"><a name="l00986"></a><span class="lineno"> 986</span>  : _Base_type(std::move(__sf))</div><div class="line"><a name="l00987"></a><span class="lineno"> 987</span>  { }</div><div class="line"><a name="l00988"></a><span class="lineno"> 988</span> </div><div class="line"><a name="l00989"></a><span class="lineno"> 989</span>  shared_future& operator=(const shared_future& __sf)</div><div class="line"><a name="l00990"></a><span class="lineno"> 990</span>  {</div><div class="line"><a name="l00991"></a><span class="lineno"> 991</span>  shared_future(__sf)._M_swap(*this);</div><div class="line"><a name="l00992"></a><span class="lineno"> 992</span>  return *this;</div><div class="line"><a name="l00993"></a><span class="lineno"> 993</span>  }</div><div class="line"><a name="l00994"></a><span class="lineno"> 994</span> </div><div class="line"><a name="l00995"></a><span class="lineno"> 995</span>  shared_future& operator=(shared_future&& __sf) noexcept</div><div class="line"><a name="l00996"></a><span class="lineno"> 996</span>  {</div><div class="line"><a name="l00997"></a><span class="lineno"> 997</span>  shared_future(std::move(__sf))._M_swap(*this);</div><div class="line"><a name="l00998"></a><span class="lineno"> 998</span>  return *this;</div><div class="line"><a name="l00999"></a><span class="lineno"> 999</span>  }</div><div class="line"><a name="l01000"></a><span class="lineno"> 1000</span> </div><div class="line"><a name="l01001"></a><span class="lineno"> 1001</span>  // Retrieving the value</div><div class="line"><a name="l01002"></a><span class="lineno"> 1002</span>  void</div><div class="line"><a name="l01003"></a><span class="lineno"> 1003</span>  get() const { this->_M_get_result(); }</div><div class="line"><a name="l01004"></a><span class="lineno"> 1004</span>  };</div><div class="line"><a name="l01005"></a><span class="lineno"> 1005</span> </div><div class="line"><a name="l01006"></a><span class="lineno"> 1006</span>  // Now we can define the protected __basic_future constructors.</div><div class="line"><a name="l01007"></a><span class="lineno"> 1007</span>  template<typename _Res></div><div class="line"><a name="l01008"></a><span class="lineno"> 1008</span>  inline __basic_future<_Res>::</div><div class="line"><a name="l01009"></a><span class="lineno"> 1009</span>  __basic_future(const shared_future<_Res>& __sf) noexcept</div><div class="line"><a name="l01010"></a><span class="lineno"> 1010</span>  : _M_state(__sf._M_state)</div><div class="line"><a name="l01011"></a><span class="lineno"> 1011</span>  { }</div><div class="line"><a name="l01012"></a><span class="lineno"> 1012</span> </div><div class="line"><a name="l01013"></a><span class="lineno"> 1013</span>  template<typename _Res></div><div class="line"><a name="l01014"></a><span class="lineno"> 1014</span>  inline __basic_future<_Res>::</div><div class="line"><a name="l01015"></a><span class="lineno"> 1015</span>  __basic_future(shared_future<_Res>&& __sf) noexcept</div><div class="line"><a name="l01016"></a><span class="lineno"> 1016</span>  : _M_state(std::move(__sf._M_state))</div><div class="line"><a name="l01017"></a><span class="lineno"> 1017</span>  { }</div><div class="line"><a name="l01018"></a><span class="lineno"> 1018</span> </div><div class="line"><a name="l01019"></a><span class="lineno"> 1019</span>  template<typename _Res></div><div class="line"><a name="l01020"></a><span class="lineno"> 1020</span>  inline __basic_future<_Res>::</div><div class="line"><a name="l01021"></a><span class="lineno"> 1021</span>  __basic_future(future<_Res>&& __uf) noexcept</div><div class="line"><a name="l01022"></a><span class="lineno"> 1022</span>  : _M_state(std::move(__uf._M_state))</div><div class="line"><a name="l01023"></a><span class="lineno"> 1023</span>  { }</div><div class="line"><a name="l01024"></a><span class="lineno"> 1024</span> </div><div class="line"><a name="l01025"></a><span class="lineno"> 1025</span>  // _GLIBCXX_RESOLVE_LIB_DEFECTS</div><div class="line"><a name="l01026"></a><span class="lineno"> 1026</span>  // 2556. Wide contract for future::share()</div><div class="line"><a name="l01027"></a><span class="lineno"> 1027</span>  template<typename _Res></div><div class="line"><a name="l01028"></a><span class="lineno"> 1028</span>  inline shared_future<_Res></div><div class="line"><a name="l01029"></a><span class="lineno"> 1029</span>  future<_Res>::share() noexcept</div><div class="line"><a name="l01030"></a><span class="lineno"> 1030</span>  { return shared_future<_Res>(std::move(*this)); }</div><div class="line"><a name="l01031"></a><span class="lineno"> 1031</span> </div><div class="line"><a name="l01032"></a><span class="lineno"> 1032</span>  template<typename _Res></div><div class="line"><a name="l01033"></a><span class="lineno"> 1033</span>  inline shared_future<_Res&></div><div class="line"><a name="l01034"></a><span class="lineno"> 1034</span>  future<_Res&>::share() noexcept</div><div class="line"><a name="l01035"></a><span class="lineno"> 1035</span>  { return shared_future<_Res&>(std::move(*this)); }</div><div class="line"><a name="l01036"></a><span class="lineno"> 1036</span> </div><div class="line"><a name="l01037"></a><span class="lineno"> 1037</span>  inline shared_future<void></div><div class="line"><a name="l01038"></a><span class="lineno"> 1038</span>  future<void>::share() noexcept</div><div class="line"><a name="l01039"></a><span class="lineno"> 1039</span>  { return shared_future<void>(std::move(*this)); }</div><div class="line"><a name="l01040"></a><span class="lineno"> 1040</span> </div><div class="line"><a name="l01041"></a><span class="lineno"> 1041</span>  /// Primary template for promise</div><div class="line"><a name="l01042"></a><span class="lineno"> 1042</span>  template<typename _Res></div><div class="line"><a name="l01043"></a><span class="lineno"> 1043</span>  class promise</div><div class="line"><a name="l01044"></a><span class="lineno"> 1044</span>  {</div><div class="line"><a name="l01045"></a><span class="lineno"> 1045</span>  typedef __future_base::_State_base _State;</div><div class="line"><a name="l01046"></a><span class="lineno"> 1046</span>  typedef __future_base::_Result<_Res> _Res_type;</div><div class="line"><a name="l01047"></a><span class="lineno"> 1047</span>  typedef __future_base::_Ptr<_Res_type> _Ptr_type;</div><div class="line"><a name="l01048"></a><span class="lineno"> 1048</span>  template<typename, typename> friend class _State::_Setter;</div><div class="line"><a name="l01049"></a><span class="lineno"> 1049</span>  friend _State;</div><div class="line"><a name="l01050"></a><span class="lineno"> 1050</span> </div><div class="line"><a name="l01051"></a><span class="lineno"> 1051</span>  shared_ptr<_State> _M_future;</div><div class="line"><a name="l01052"></a><span class="lineno"> 1052</span>  _Ptr_type _M_storage;</div><div class="line"><a name="l01053"></a><span class="lineno"> 1053</span> </div><div class="line"><a name="l01054"></a><span class="lineno"> 1054</span>  public:</div><div class="line"><a name="l01055"></a><span class="lineno"> 1055</span>  promise()</div><div class="line"><a name="l01056"></a><span class="lineno"> 1056</span>  : _M_future(std::make_shared<_State>()),</div><div class="line"><a name="l01057"></a><span class="lineno"> 1057</span>  _M_storage(new _Res_type())</div><div class="line"><a name="l01058"></a><span class="lineno"> 1058</span>  { }</div><div class="line"><a name="l01059"></a><span class="lineno"> 1059</span> </div><div class="line"><a name="l01060"></a><span class="lineno"> 1060</span>  promise(promise&& __rhs) noexcept</div><div class="line"><a name="l01061"></a><span class="lineno"> 1061</span>  : _M_future(std::move(__rhs._M_future)),</div><div class="line"><a name="l01062"></a><span class="lineno"> 1062</span>  _M_storage(std::move(__rhs._M_storage))</div><div class="line"><a name="l01063"></a><span class="lineno"> 1063</span>  { }</div><div class="line"><a name="l01064"></a><span class="lineno"> 1064</span> </div><div class="line"><a name="l01065"></a><span class="lineno"> 1065</span>  template<typename _Allocator></div><div class="line"><a name="l01066"></a><span class="lineno"> 1066</span>  promise(allocator_arg_t, const _Allocator& __a)</div><div class="line"><a name="l01067"></a><span class="lineno"> 1067</span>  : _M_future(std::allocate_shared<_State>(__a)),</div><div class="line"><a name="l01068"></a><span class="lineno"> 1068</span>  _M_storage(__future_base::_S_allocate_result<_Res>(__a))</div><div class="line"><a name="l01069"></a><span class="lineno"> 1069</span>  { }</div><div class="line"><a name="l01070"></a><span class="lineno"> 1070</span> </div><div class="line"><a name="l01071"></a><span class="lineno"> 1071</span>  template<typename _Allocator></div><div class="line"><a name="l01072"></a><span class="lineno"> 1072</span>  promise(allocator_arg_t, const _Allocator&, promise&& __rhs)</div><div class="line"><a name="l01073"></a><span class="lineno"> 1073</span>  : _M_future(std::move(__rhs._M_future)),</div><div class="line"><a name="l01074"></a><span class="lineno"> 1074</span>  _M_storage(std::move(__rhs._M_storage))</div><div class="line"><a name="l01075"></a><span class="lineno"> 1075</span>  { }</div><div class="line"><a name="l01076"></a><span class="lineno"> 1076</span> </div><div class="line"><a name="l01077"></a><span class="lineno"> 1077</span>  promise(const promise&) = delete;</div><div class="line"><a name="l01078"></a><span class="lineno"> 1078</span> </div><div class="line"><a name="l01079"></a><span class="lineno"> 1079</span>  ~promise()</div><div class="line"><a name="l01080"></a><span class="lineno"> 1080</span>  {</div><div class="line"><a name="l01081"></a><span class="lineno"> 1081</span>  if (static_cast<bool>(_M_future) && !_M_future.unique())</div><div class="line"><a name="l01082"></a><span class="lineno"> 1082</span>  _M_future->_M_break_promise(std::move(_M_storage));</div><div class="line"><a name="l01083"></a><span class="lineno"> 1083</span>  }</div><div class="line"><a name="l01084"></a><span class="lineno"> 1084</span> </div><div class="line"><a name="l01085"></a><span class="lineno"> 1085</span>  // Assignment</div><div class="line"><a name="l01086"></a><span class="lineno"> 1086</span>  promise&</div><div class="line"><a name="l01087"></a><span class="lineno"> 1087</span>  operator=(promise&& __rhs) noexcept</div><div class="line"><a name="l01088"></a><span class="lineno"> 1088</span>  {</div><div class="line"><a name="l01089"></a><span class="lineno"> 1089</span>  promise(std::move(__rhs)).swap(*this);</div><div class="line"><a name="l01090"></a><span class="lineno"> 1090</span>  return *this;</div><div class="line"><a name="l01091"></a><span class="lineno"> 1091</span>  }</div><div class="line"><a name="l01092"></a><span class="lineno"> 1092</span> </div><div class="line"><a name="l01093"></a><span class="lineno"> 1093</span>  promise& operator=(const promise&) = delete;</div><div class="line"><a name="l01094"></a><span class="lineno"> 1094</span> </div><div class="line"><a name="l01095"></a><span class="lineno"> 1095</span>  void</div><div class="line"><a name="l01096"></a><span class="lineno"> 1096</span>  swap(promise& __rhs) noexcept</div><div class="line"><a name="l01097"></a><span class="lineno"> 1097</span>  {</div><div class="line"><a name="l01098"></a><span class="lineno"> 1098</span>  _M_future.swap(__rhs._M_future);</div><div class="line"><a name="l01099"></a><span class="lineno"> 1099</span>  _M_storage.swap(__rhs._M_storage);</div><div class="line"><a name="l01100"></a><span class="lineno"> 1100</span>  }</div><div class="line"><a name="l01101"></a><span class="lineno"> 1101</span> </div><div class="line"><a name="l01102"></a><span class="lineno"> 1102</span>  // Retrieving the result</div><div class="line"><a name="l01103"></a><span class="lineno"> 1103</span>  future<_Res></div><div class="line"><a name="l01104"></a><span class="lineno"> 1104</span>  get_future()</div><div class="line"><a name="l01105"></a><span class="lineno"> 1105</span>  { return future<_Res>(_M_future); }</div><div class="line"><a name="l01106"></a><span class="lineno"> 1106</span> </div><div class="line"><a name="l01107"></a><span class="lineno"> 1107</span>  // Setting the result</div><div class="line"><a name="l01108"></a><span class="lineno"> 1108</span>  void</div><div class="line"><a name="l01109"></a><span class="lineno"> 1109</span>  set_value(const _Res& __r)</div><div class="line"><a name="l01110"></a><span class="lineno"> 1110</span>  { _M_future->_M_set_result(_State::__setter(this, __r)); }</div><div class="line"><a name="l01111"></a><span class="lineno"> 1111</span> </div><div class="line"><a name="l01112"></a><span class="lineno"> 1112</span>  void</div><div class="line"><a name="l01113"></a><span class="lineno"> 1113</span>  set_value(_Res&& __r)</div><div class="line"><a name="l01114"></a><span class="lineno"> 1114</span>  { _M_future->_M_set_result(_State::__setter(this, std::move(__r))); }</div><div class="line"><a name="l01115"></a><span class="lineno"> 1115</span> </div><div class="line"><a name="l01116"></a><span class="lineno"> 1116</span>  void</div><div class="line"><a name="l01117"></a><span class="lineno"> 1117</span>  set_exception(exception_ptr __p)</div><div class="line"><a name="l01118"></a><span class="lineno"> 1118</span>  { _M_future->_M_set_result(_State::__setter(__p, this)); }</div><div class="line"><a name="l01119"></a><span class="lineno"> 1119</span> </div><div class="line"><a name="l01120"></a><span class="lineno"> 1120</span>  void</div><div class="line"><a name="l01121"></a><span class="lineno"> 1121</span>  set_value_at_thread_exit(const _Res& __r)</div><div class="line"><a name="l01122"></a><span class="lineno"> 1122</span>  {</div><div class="line"><a name="l01123"></a><span class="lineno"> 1123</span>  _M_future->_M_set_delayed_result(_State::__setter(this, __r),</div><div class="line"><a name="l01124"></a><span class="lineno"> 1124</span>  _M_future);</div><div class="line"><a name="l01125"></a><span class="lineno"> 1125</span>  }</div><div class="line"><a name="l01126"></a><span class="lineno"> 1126</span> </div><div class="line"><a name="l01127"></a><span class="lineno"> 1127</span>  void</div><div class="line"><a name="l01128"></a><span class="lineno"> 1128</span>  set_value_at_thread_exit(_Res&& __r)</div><div class="line"><a name="l01129"></a><span class="lineno"> 1129</span>  {</div><div class="line"><a name="l01130"></a><span class="lineno"> 1130</span>  _M_future->_M_set_delayed_result(</div><div class="line"><a name="l01131"></a><span class="lineno"> 1131</span>  _State::__setter(this, std::move(__r)), _M_future);</div><div class="line"><a name="l01132"></a><span class="lineno"> 1132</span>  }</div><div class="line"><a name="l01133"></a><span class="lineno"> 1133</span> </div><div class="line"><a name="l01134"></a><span class="lineno"> 1134</span>  void</div><div class="line"><a name="l01135"></a><span class="lineno"> 1135</span>  set_exception_at_thread_exit(exception_ptr __p)</div><div class="line"><a name="l01136"></a><span class="lineno"> 1136</span>  {</div><div class="line"><a name="l01137"></a><span class="lineno"> 1137</span>  _M_future->_M_set_delayed_result(_State::__setter(__p, this),</div><div class="line"><a name="l01138"></a><span class="lineno"> 1138</span>  _M_future);</div><div class="line"><a name="l01139"></a><span class="lineno"> 1139</span>  }</div><div class="line"><a name="l01140"></a><span class="lineno"> 1140</span>  };</div><div class="line"><a name="l01141"></a><span class="lineno"> 1141</span> </div><div class="line"><a name="l01142"></a><span class="lineno"> 1142</span>  template<typename _Res></div><div class="line"><a name="l01143"></a><span class="lineno"> 1143</span>  inline void</div><div class="line"><a name="l01144"></a><span class="lineno"> 1144</span>  swap(promise<_Res>& __x, promise<_Res>& __y) noexcept</div><div class="line"><a name="l01145"></a><span class="lineno"> 1145</span>  { __x.swap(__y); }</div><div class="line"><a name="l01146"></a><span class="lineno"> 1146</span> </div><div class="line"><a name="l01147"></a><span class="lineno"> 1147</span>  template<typename _Res, typename _Alloc></div><div class="line"><a name="l01148"></a><span class="lineno"> 1148</span>  struct uses_allocator<promise<_Res>, _Alloc></div><div class="line"><a name="l01149"></a><span class="lineno"> 1149</span>  : public true_type { };</div><div class="line"><a name="l01150"></a><span class="lineno"> 1150</span> </div><div class="line"><a name="l01151"></a><span class="lineno"> 1151</span> </div><div class="line"><a name="l01152"></a><span class="lineno"> 1152</span>  /// Partial specialization for promise<R&></div><div class="line"><a name="l01153"></a><span class="lineno"> 1153</span>  template<typename _Res></div><div class="line"><a name="l01154"></a><span class="lineno"> 1154</span>  class promise<_Res&></div><div class="line"><a name="l01155"></a><span class="lineno"> 1155</span>  {</div><div class="line"><a name="l01156"></a><span class="lineno"> 1156</span>  typedef __future_base::_State_base _State;</div><div class="line"><a name="l01157"></a><span class="lineno"> 1157</span>  typedef __future_base::_Result<_Res&> _Res_type;</div><div class="line"><a name="l01158"></a><span class="lineno"> 1158</span>  typedef __future_base::_Ptr<_Res_type> _Ptr_type;</div><div class="line"><a name="l01159"></a><span class="lineno"> 1159</span>  template<typename, typename> friend class _State::_Setter;</div><div class="line"><a name="l01160"></a><span class="lineno"> 1160</span>  friend _State;</div><div class="line"><a name="l01161"></a><span class="lineno"> 1161</span> </div><div class="line"><a name="l01162"></a><span class="lineno"> 1162</span>  shared_ptr<_State> _M_future;</div><div class="line"><a name="l01163"></a><span class="lineno"> 1163</span>  _Ptr_type _M_storage;</div><div class="line"><a name="l01164"></a><span class="lineno"> 1164</span> </div><div class="line"><a name="l01165"></a><span class="lineno"> 1165</span>  public:</div><div class="line"><a name="l01166"></a><span class="lineno"> 1166</span>  promise()</div><div class="line"><a name="l01167"></a><span class="lineno"> 1167</span>  : _M_future(std::make_shared<_State>()),</div><div class="line"><a name="l01168"></a><span class="lineno"> 1168</span>  _M_storage(new _Res_type())</div><div class="line"><a name="l01169"></a><span class="lineno"> 1169</span>  { }</div><div class="line"><a name="l01170"></a><span class="lineno"> 1170</span> </div><div class="line"><a name="l01171"></a><span class="lineno"> 1171</span>  promise(promise&& __rhs) noexcept</div><div class="line"><a name="l01172"></a><span class="lineno"> 1172</span>  : _M_future(std::move(__rhs._M_future)),</div><div class="line"><a name="l01173"></a><span class="lineno"> 1173</span>  _M_storage(std::move(__rhs._M_storage))</div><div class="line"><a name="l01174"></a><span class="lineno"> 1174</span>  { }</div><div class="line"><a name="l01175"></a><span class="lineno"> 1175</span> </div><div class="line"><a name="l01176"></a><span class="lineno"> 1176</span>  template<typename _Allocator></div><div class="line"><a name="l01177"></a><span class="lineno"> 1177</span>  promise(allocator_arg_t, const _Allocator& __a)</div><div class="line"><a name="l01178"></a><span class="lineno"> 1178</span>  : _M_future(std::allocate_shared<_State>(__a)),</div><div class="line"><a name="l01179"></a><span class="lineno"> 1179</span>  _M_storage(__future_base::_S_allocate_result<_Res&>(__a))</div><div class="line"><a name="l01180"></a><span class="lineno"> 1180</span>  { }</div><div class="line"><a name="l01181"></a><span class="lineno"> 1181</span> </div><div class="line"><a name="l01182"></a><span class="lineno"> 1182</span>  template<typename _Allocator></div><div class="line"><a name="l01183"></a><span class="lineno"> 1183</span>  promise(allocator_arg_t, const _Allocator&, promise&& __rhs)</div><div class="line"><a name="l01184"></a><span class="lineno"> 1184</span>  : _M_future(std::move(__rhs._M_future)),</div><div class="line"><a name="l01185"></a><span class="lineno"> 1185</span>  _M_storage(std::move(__rhs._M_storage))</div><div class="line"><a name="l01186"></a><span class="lineno"> 1186</span>  { }</div><div class="line"><a name="l01187"></a><span class="lineno"> 1187</span> </div><div class="line"><a name="l01188"></a><span class="lineno"> 1188</span>  promise(const promise&) = delete;</div><div class="line"><a name="l01189"></a><span class="lineno"> 1189</span> </div><div class="line"><a name="l01190"></a><span class="lineno"> 1190</span>  ~promise()</div><div class="line"><a name="l01191"></a><span class="lineno"> 1191</span>  {</div><div class="line"><a name="l01192"></a><span class="lineno"> 1192</span>  if (static_cast<bool>(_M_future) && !_M_future.unique())</div><div class="line"><a name="l01193"></a><span class="lineno"> 1193</span>  _M_future->_M_break_promise(std::move(_M_storage));</div><div class="line"><a name="l01194"></a><span class="lineno"> 1194</span>  }</div><div class="line"><a name="l01195"></a><span class="lineno"> 1195</span> </div><div class="line"><a name="l01196"></a><span class="lineno"> 1196</span>  // Assignment</div><div class="line"><a name="l01197"></a><span class="lineno"> 1197</span>  promise&</div><div class="line"><a name="l01198"></a><span class="lineno"> 1198</span>  operator=(promise&& __rhs) noexcept</div><div class="line"><a name="l01199"></a><span class="lineno"> 1199</span>  {</div><div class="line"><a name="l01200"></a><span class="lineno"> 1200</span>  promise(std::move(__rhs)).swap(*this);</div><div class="line"><a name="l01201"></a><span class="lineno"> 1201</span>  return *this;</div><div class="line"><a name="l01202"></a><span class="lineno"> 1202</span>  }</div><div class="line"><a name="l01203"></a><span class="lineno"> 1203</span> </div><div class="line"><a name="l01204"></a><span class="lineno"> 1204</span>  promise& operator=(const promise&) = delete;</div><div class="line"><a name="l01205"></a><span class="lineno"> 1205</span> </div><div class="line"><a name="l01206"></a><span class="lineno"> 1206</span>  void</div><div class="line"><a name="l01207"></a><span class="lineno"> 1207</span>  swap(promise& __rhs) noexcept</div><div class="line"><a name="l01208"></a><span class="lineno"> 1208</span>  {</div><div class="line"><a name="l01209"></a><span class="lineno"> 1209</span>  _M_future.swap(__rhs._M_future);</div><div class="line"><a name="l01210"></a><span class="lineno"> 1210</span>  _M_storage.swap(__rhs._M_storage);</div><div class="line"><a name="l01211"></a><span class="lineno"> 1211</span>  }</div><div class="line"><a name="l01212"></a><span class="lineno"> 1212</span> </div><div class="line"><a name="l01213"></a><span class="lineno"> 1213</span>  // Retrieving the result</div><div class="line"><a name="l01214"></a><span class="lineno"> 1214</span>  future<_Res&></div><div class="line"><a name="l01215"></a><span class="lineno"> 1215</span>  get_future()</div><div class="line"><a name="l01216"></a><span class="lineno"> 1216</span>  { return future<_Res&>(_M_future); }</div><div class="line"><a name="l01217"></a><span class="lineno"> 1217</span> </div><div class="line"><a name="l01218"></a><span class="lineno"> 1218</span>  // Setting the result</div><div class="line"><a name="l01219"></a><span class="lineno"> 1219</span>  void</div><div class="line"><a name="l01220"></a><span class="lineno"> 1220</span>  set_value(_Res& __r)</div><div class="line"><a name="l01221"></a><span class="lineno"> 1221</span>  { _M_future->_M_set_result(_State::__setter(this, __r)); }</div><div class="line"><a name="l01222"></a><span class="lineno"> 1222</span> </div><div class="line"><a name="l01223"></a><span class="lineno"> 1223</span>  void</div><div class="line"><a name="l01224"></a><span class="lineno"> 1224</span>  set_exception(exception_ptr __p)</div><div class="line"><a name="l01225"></a><span class="lineno"> 1225</span>  { _M_future->_M_set_result(_State::__setter(__p, this)); }</div><div class="line"><a name="l01226"></a><span class="lineno"> 1226</span> </div><div class="line"><a name="l01227"></a><span class="lineno"> 1227</span>  void</div><div class="line"><a name="l01228"></a><span class="lineno"> 1228</span>  set_value_at_thread_exit(_Res& __r)</div><div class="line"><a name="l01229"></a><span class="lineno"> 1229</span>  {</div><div class="line"><a name="l01230"></a><span class="lineno"> 1230</span>  _M_future->_M_set_delayed_result(_State::__setter(this, __r),</div><div class="line"><a name="l01231"></a><span class="lineno"> 1231</span>  _M_future);</div><div class="line"><a name="l01232"></a><span class="lineno"> 1232</span>  }</div><div class="line"><a name="l01233"></a><span class="lineno"> 1233</span> </div><div class="line"><a name="l01234"></a><span class="lineno"> 1234</span>  void</div><div class="line"><a name="l01235"></a><span class="lineno"> 1235</span>  set_exception_at_thread_exit(exception_ptr __p)</div><div class="line"><a name="l01236"></a><span class="lineno"> 1236</span>  {</div><div class="line"><a name="l01237"></a><span class="lineno"> 1237</span>  _M_future->_M_set_delayed_result(_State::__setter(__p, this),</div><div class="line"><a name="l01238"></a><span class="lineno"> 1238</span>  _M_future);</div><div class="line"><a name="l01239"></a><span class="lineno"> 1239</span>  }</div><div class="line"><a name="l01240"></a><span class="lineno"> 1240</span>  };</div><div class="line"><a name="l01241"></a><span class="lineno"> 1241</span> </div><div class="line"><a name="l01242"></a><span class="lineno"> 1242</span>  /// Explicit specialization for promise<void></div><div class="line"><a name="l01243"></a><span class="lineno"> 1243</span>  template<></div><div class="line"><a name="l01244"></a><span class="lineno"> 1244</span>  class promise<void></div><div class="line"><a name="l01245"></a><span class="lineno"> 1245</span>  {</div><div class="line"><a name="l01246"></a><span class="lineno"> 1246</span>  typedef __future_base::_State_base _State;</div><div class="line"><a name="l01247"></a><span class="lineno"> 1247</span>  typedef __future_base::_Result<void> _Res_type;</div><div class="line"><a name="l01248"></a><span class="lineno"> 1248</span>  typedef __future_base::_Ptr<_Res_type> _Ptr_type;</div><div class="line"><a name="l01249"></a><span class="lineno"> 1249</span>  template<typename, typename> friend class _State::_Setter;</div><div class="line"><a name="l01250"></a><span class="lineno"> 1250</span>  friend _State;</div><div class="line"><a name="l01251"></a><span class="lineno"> 1251</span> </div><div class="line"><a name="l01252"></a><span class="lineno"> 1252</span>  shared_ptr<_State> _M_future;</div><div class="line"><a name="l01253"></a><span class="lineno"> 1253</span>  _Ptr_type _M_storage;</div><div class="line"><a name="l01254"></a><span class="lineno"> 1254</span> </div><div class="line"><a name="l01255"></a><span class="lineno"> 1255</span>  public:</div><div class="line"><a name="l01256"></a><span class="lineno"> 1256</span>  promise()</div><div class="line"><a name="l01257"></a><span class="lineno"> 1257</span>  : _M_future(std::make_shared<_State>()),</div><div class="line"><a name="l01258"></a><span class="lineno"> 1258</span>  _M_storage(new _Res_type())</div><div class="line"><a name="l01259"></a><span class="lineno"> 1259</span>  { }</div><div class="line"><a name="l01260"></a><span class="lineno"> 1260</span> </div><div class="line"><a name="l01261"></a><span class="lineno"> 1261</span>  promise(promise&& __rhs) noexcept</div><div class="line"><a name="l01262"></a><span class="lineno"> 1262</span>  : _M_future(std::move(__rhs._M_future)),</div><div class="line"><a name="l01263"></a><span class="lineno"> 1263</span>  _M_storage(std::move(__rhs._M_storage))</div><div class="line"><a name="l01264"></a><span class="lineno"> 1264</span>  { }</div><div class="line"><a name="l01265"></a><span class="lineno"> 1265</span> </div><div class="line"><a name="l01266"></a><span class="lineno"> 1266</span>  template<typename _Allocator></div><div class="line"><a name="l01267"></a><span class="lineno"> 1267</span>  promise(allocator_arg_t, const _Allocator& __a)</div><div class="line"><a name="l01268"></a><span class="lineno"> 1268</span>  : _M_future(std::allocate_shared<_State>(__a)),</div><div class="line"><a name="l01269"></a><span class="lineno"> 1269</span>  _M_storage(__future_base::_S_allocate_result<void>(__a))</div><div class="line"><a name="l01270"></a><span class="lineno"> 1270</span>  { }</div><div class="line"><a name="l01271"></a><span class="lineno"> 1271</span> </div><div class="line"><a name="l01272"></a><span class="lineno"> 1272</span>  // _GLIBCXX_RESOLVE_LIB_DEFECTS</div><div class="line"><a name="l01273"></a><span class="lineno"> 1273</span>  // 2095. missing constructors needed for uses-allocator construction</div><div class="line"><a name="l01274"></a><span class="lineno"> 1274</span>  template<typename _Allocator></div><div class="line"><a name="l01275"></a><span class="lineno"> 1275</span>  promise(allocator_arg_t, const _Allocator&, promise&& __rhs)</div><div class="line"><a name="l01276"></a><span class="lineno"> 1276</span>  : _M_future(std::move(__rhs._M_future)),</div><div class="line"><a name="l01277"></a><span class="lineno"> 1277</span>  _M_storage(std::move(__rhs._M_storage))</div><div class="line"><a name="l01278"></a><span class="lineno"> 1278</span>  { }</div><div class="line"><a name="l01279"></a><span class="lineno"> 1279</span> </div><div class="line"><a name="l01280"></a><span class="lineno"> 1280</span>  promise(const promise&) = delete;</div><div class="line"><a name="l01281"></a><span class="lineno"> 1281</span> </div><div class="line"><a name="l01282"></a><span class="lineno"> 1282</span>  ~promise()</div><div class="line"><a name="l01283"></a><span class="lineno"> 1283</span>  {</div><div class="line"><a name="l01284"></a><span class="lineno"> 1284</span>  if (static_cast<bool>(_M_future) && !_M_future.unique())</div><div class="line"><a name="l01285"></a><span class="lineno"> 1285</span>  _M_future->_M_break_promise(std::move(_M_storage));</div><div class="line"><a name="l01286"></a><span class="lineno"> 1286</span>  }</div><div class="line"><a name="l01287"></a><span class="lineno"> 1287</span> </div><div class="line"><a name="l01288"></a><span class="lineno"> 1288</span>  // Assignment</div><div class="line"><a name="l01289"></a><span class="lineno"> 1289</span>  promise&</div><div class="line"><a name="l01290"></a><span class="lineno"> 1290</span>  operator=(promise&& __rhs) noexcept</div><div class="line"><a name="l01291"></a><span class="lineno"> 1291</span>  {</div><div class="line"><a name="l01292"></a><span class="lineno"> 1292</span>  promise(std::move(__rhs)).swap(*this);</div><div class="line"><a name="l01293"></a><span class="lineno"> 1293</span>  return *this;</div><div class="line"><a name="l01294"></a><span class="lineno"> 1294</span>  }</div><div class="line"><a name="l01295"></a><span class="lineno"> 1295</span> </div><div class="line"><a name="l01296"></a><span class="lineno"> 1296</span>  promise& operator=(const promise&) = delete;</div><div class="line"><a name="l01297"></a><span class="lineno"> 1297</span> </div><div class="line"><a name="l01298"></a><span class="lineno"> 1298</span>  void</div><div class="line"><a name="l01299"></a><span class="lineno"> 1299</span>  swap(promise& __rhs) noexcept</div><div class="line"><a name="l01300"></a><span class="lineno"> 1300</span>  {</div><div class="line"><a name="l01301"></a><span class="lineno"> 1301</span>  _M_future.swap(__rhs._M_future);</div><div class="line"><a name="l01302"></a><span class="lineno"> 1302</span>  _M_storage.swap(__rhs._M_storage);</div><div class="line"><a name="l01303"></a><span class="lineno"> 1303</span>  }</div><div class="line"><a name="l01304"></a><span class="lineno"> 1304</span> </div><div class="line"><a name="l01305"></a><span class="lineno"> 1305</span>  // Retrieving the result</div><div class="line"><a name="l01306"></a><span class="lineno"> 1306</span>  future<void></div><div class="line"><a name="l01307"></a><span class="lineno"> 1307</span>  get_future()</div><div class="line"><a name="l01308"></a><span class="lineno"> 1308</span>  { return future<void>(_M_future); }</div><div class="line"><a name="l01309"></a><span class="lineno"> 1309</span> </div><div class="line"><a name="l01310"></a><span class="lineno"> 1310</span>  // Setting the result</div><div class="line"><a name="l01311"></a><span class="lineno"> 1311</span>  void</div><div class="line"><a name="l01312"></a><span class="lineno"> 1312</span>  set_value()</div><div class="line"><a name="l01313"></a><span class="lineno"> 1313</span>  { _M_future->_M_set_result(_State::__setter(this)); }</div><div class="line"><a name="l01314"></a><span class="lineno"> 1314</span> </div><div class="line"><a name="l01315"></a><span class="lineno"> 1315</span>  void</div><div class="line"><a name="l01316"></a><span class="lineno"> 1316</span>  set_exception(exception_ptr __p)</div><div class="line"><a name="l01317"></a><span class="lineno"> 1317</span>  { _M_future->_M_set_result(_State::__setter(__p, this)); }</div><div class="line"><a name="l01318"></a><span class="lineno"> 1318</span> </div><div class="line"><a name="l01319"></a><span class="lineno"> 1319</span>  void</div><div class="line"><a name="l01320"></a><span class="lineno"> 1320</span>  set_value_at_thread_exit()</div><div class="line"><a name="l01321"></a><span class="lineno"> 1321</span>  { _M_future->_M_set_delayed_result(_State::__setter(this), _M_future); }</div><div class="line"><a name="l01322"></a><span class="lineno"> 1322</span> </div><div class="line"><a name="l01323"></a><span class="lineno"> 1323</span>  void</div><div class="line"><a name="l01324"></a><span class="lineno"> 1324</span>  set_exception_at_thread_exit(exception_ptr __p)</div><div class="line"><a name="l01325"></a><span class="lineno"> 1325</span>  {</div><div class="line"><a name="l01326"></a><span class="lineno"> 1326</span>  _M_future->_M_set_delayed_result(_State::__setter(__p, this),</div><div class="line"><a name="l01327"></a><span class="lineno"> 1327</span>  _M_future);</div><div class="line"><a name="l01328"></a><span class="lineno"> 1328</span>  }</div><div class="line"><a name="l01329"></a><span class="lineno"> 1329</span>  };</div><div class="line"><a name="l01330"></a><span class="lineno"> 1330</span> </div><div class="line"><a name="l01331"></a><span class="lineno"> 1331</span>  template<typename _Ptr_type, typename _Fn, typename _Res></div><div class="line"><a name="l01332"></a><span class="lineno"> 1332</span>  struct __future_base::_Task_setter</div><div class="line"><a name="l01333"></a><span class="lineno"> 1333</span>  {</div><div class="line"><a name="l01334"></a><span class="lineno"> 1334</span>  // Invoke the function and provide the result to the caller.</div><div class="line"><a name="l01335"></a><span class="lineno"> 1335</span>  _Ptr_type operator()() const</div><div class="line"><a name="l01336"></a><span class="lineno"> 1336</span>  {</div><div class="line"><a name="l01337"></a><span class="lineno"> 1337</span>  __try</div><div class="line"><a name="l01338"></a><span class="lineno"> 1338</span>  {</div><div class="line"><a name="l01339"></a><span class="lineno"> 1339</span>  (*_M_result)->_M_set((*_M_fn)());</div><div class="line"><a name="l01340"></a><span class="lineno"> 1340</span>  }</div><div class="line"><a name="l01341"></a><span class="lineno"> 1341</span>  __catch(const __cxxabiv1::__forced_unwind&)</div><div class="line"><a name="l01342"></a><span class="lineno"> 1342</span>  {</div><div class="line"><a name="l01343"></a><span class="lineno"> 1343</span>  __throw_exception_again; // will cause broken_promise</div><div class="line"><a name="l01344"></a><span class="lineno"> 1344</span>  }</div><div class="line"><a name="l01345"></a><span class="lineno"> 1345</span>  __catch(...)</div><div class="line"><a name="l01346"></a><span class="lineno"> 1346</span>  {</div><div class="line"><a name="l01347"></a><span class="lineno"> 1347</span>  (*_M_result)->_M_error = current_exception();</div><div class="line"><a name="l01348"></a><span class="lineno"> 1348</span>  }</div><div class="line"><a name="l01349"></a><span class="lineno"> 1349</span>  return std::move(*_M_result);</div><div class="line"><a name="l01350"></a><span class="lineno"> 1350</span>  }</div><div class="line"><a name="l01351"></a><span class="lineno"> 1351</span>  _Ptr_type* _M_result;</div><div class="line"><a name="l01352"></a><span class="lineno"> 1352</span>  _Fn* _M_fn;</div><div class="line"><a name="l01353"></a><span class="lineno"> 1353</span>  };</div><div class="line"><a name="l01354"></a><span class="lineno"> 1354</span> </div><div class="line"><a name="l01355"></a><span class="lineno"> 1355</span>  template<typename _Ptr_type, typename _Fn></div><div class="line"><a name="l01356"></a><span class="lineno"> 1356</span>  struct __future_base::_Task_setter<_Ptr_type, _Fn, void></div><div class="line"><a name="l01357"></a><span class="lineno"> 1357</span>  {</div><div class="line"><a name="l01358"></a><span class="lineno"> 1358</span>  _Ptr_type operator()() const</div><div class="line"><a name="l01359"></a><span class="lineno"> 1359</span>  {</div><div class="line"><a name="l01360"></a><span class="lineno"> 1360</span>  __try</div><div class="line"><a name="l01361"></a><span class="lineno"> 1361</span>  {</div><div class="line"><a name="l01362"></a><span class="lineno"> 1362</span>  (*_M_fn)();</div><div class="line"><a name="l01363"></a><span class="lineno"> 1363</span>  }</div><div class="line"><a name="l01364"></a><span class="lineno"> 1364</span>  __catch(const __cxxabiv1::__forced_unwind&)</div><div class="line"><a name="l01365"></a><span class="lineno"> 1365</span>  {</div><div class="line"><a name="l01366"></a><span class="lineno"> 1366</span>  __throw_exception_again; // will cause broken_promise</div><div class="line"><a name="l01367"></a><span class="lineno"> 1367</span>  }</div><div class="line"><a name="l01368"></a><span class="lineno"> 1368</span>  __catch(...)</div><div class="line"><a name="l01369"></a><span class="lineno"> 1369</span>  {</div><div class="line"><a name="l01370"></a><span class="lineno"> 1370</span>  (*_M_result)->_M_error = current_exception();</div><div class="line"><a name="l01371"></a><span class="lineno"> 1371</span>  }</div><div class="line"><a name="l01372"></a><span class="lineno"> 1372</span>  return std::move(*_M_result);</div><div class="line"><a name="l01373"></a><span class="lineno"> 1373</span>  }</div><div class="line"><a name="l01374"></a><span class="lineno"> 1374</span>  _Ptr_type* _M_result;</div><div class="line"><a name="l01375"></a><span class="lineno"> 1375</span>  _Fn* _M_fn;</div><div class="line"><a name="l01376"></a><span class="lineno"> 1376</span>  };</div><div class="line"><a name="l01377"></a><span class="lineno"> 1377</span> </div><div class="line"><a name="l01378"></a><span class="lineno"> 1378</span>  // Holds storage for a packaged_task's result.</div><div class="line"><a name="l01379"></a><span class="lineno"> 1379</span>  template<typename _Res, typename... _Args></div><div class="line"><a name="l01380"></a><span class="lineno"> 1380</span>  struct __future_base::_Task_state_base<_Res(_Args...)></div><div class="line"><a name="l01381"></a><span class="lineno"> 1381</span>  : __future_base::_State_base</div><div class="line"><a name="l01382"></a><span class="lineno"> 1382</span>  {</div><div class="line"><a name="l01383"></a><span class="lineno"> 1383</span>  typedef _Res _Res_type;</div><div class="line"><a name="l01384"></a><span class="lineno"> 1384</span> </div><div class="line"><a name="l01385"></a><span class="lineno"> 1385</span>  template<typename _Alloc></div><div class="line"><a name="l01386"></a><span class="lineno"> 1386</span>  _Task_state_base(const _Alloc& __a)</div><div class="line"><a name="l01387"></a><span class="lineno"> 1387</span>  : _M_result(_S_allocate_result<_Res>(__a))</div><div class="line"><a name="l01388"></a><span class="lineno"> 1388</span>  { }</div><div class="line"><a name="l01389"></a><span class="lineno"> 1389</span> </div><div class="line"><a name="l01390"></a><span class="lineno"> 1390</span>  // Invoke the stored task and make the state ready.</div><div class="line"><a name="l01391"></a><span class="lineno"> 1391</span>  virtual void</div><div class="line"><a name="l01392"></a><span class="lineno"> 1392</span>  _M_run(_Args&&... __args) = 0;</div><div class="line"><a name="l01393"></a><span class="lineno"> 1393</span> </div><div class="line"><a name="l01394"></a><span class="lineno"> 1394</span>  // Invoke the stored task and make the state ready at thread exit.</div><div class="line"><a name="l01395"></a><span class="lineno"> 1395</span>  virtual void</div><div class="line"><a name="l01396"></a><span class="lineno"> 1396</span>  _M_run_delayed(_Args&&... __args, weak_ptr<_State_base>) = 0;</div><div class="line"><a name="l01397"></a><span class="lineno"> 1397</span> </div><div class="line"><a name="l01398"></a><span class="lineno"> 1398</span>  virtual shared_ptr<_Task_state_base></div><div class="line"><a name="l01399"></a><span class="lineno"> 1399</span>  _M_reset() = 0;</div><div class="line"><a name="l01400"></a><span class="lineno"> 1400</span> </div><div class="line"><a name="l01401"></a><span class="lineno"> 1401</span>  typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type;</div><div class="line"><a name="l01402"></a><span class="lineno"> 1402</span>  _Ptr_type _M_result;</div><div class="line"><a name="l01403"></a><span class="lineno"> 1403</span>  };</div><div class="line"><a name="l01404"></a><span class="lineno"> 1404</span> </div><div class="line"><a name="l01405"></a><span class="lineno"> 1405</span>  // Holds a packaged_task's stored task.</div><div class="line"><a name="l01406"></a><span class="lineno"> 1406</span>  template<typename _Fn, typename _Alloc, typename _Res, typename... _Args></div><div class="line"><a name="l01407"></a><span class="lineno"> 1407</span>  struct __future_base::_Task_state<_Fn, _Alloc, _Res(_Args...)> final</div><div class="line"><a name="l01408"></a><span class="lineno"> 1408</span>  : __future_base::_Task_state_base<_Res(_Args...)></div><div class="line"><a name="l01409"></a><span class="lineno"> 1409</span>  {</div><div class="line"><a name="l01410"></a><span class="lineno"> 1410</span>  template<typename _Fn2></div><div class="line"><a name="l01411"></a><span class="lineno"> 1411</span>  _Task_state(_Fn2&& __fn, const _Alloc& __a)</div><div class="line"><a name="l01412"></a><span class="lineno"> 1412</span>  : _Task_state_base<_Res(_Args...)>(__a),</div><div class="line"><a name="l01413"></a><span class="lineno"> 1413</span>  _M_impl(std::forward<_Fn2>(__fn), __a)</div><div class="line"><a name="l01414"></a><span class="lineno"> 1414</span>  { }</div><div class="line"><a name="l01415"></a><span class="lineno"> 1415</span> </div><div class="line"><a name="l01416"></a><span class="lineno"> 1416</span>  private:</div><div class="line"><a name="l01417"></a><span class="lineno"> 1417</span>  virtual void</div><div class="line"><a name="l01418"></a><span class="lineno"> 1418</span>  _M_run(_Args&&... __args)</div><div class="line"><a name="l01419"></a><span class="lineno"> 1419</span>  {</div><div class="line"><a name="l01420"></a><span class="lineno"> 1420</span>  auto __boundfn = [&] () -> typename result_of<_Fn&(_Args&&...)>::type {</div><div class="line"><a name="l01421"></a><span class="lineno"> 1421</span>  return std::__invoke(_M_impl._M_fn, std::forward<_Args>(__args)...);</div><div class="line"><a name="l01422"></a><span class="lineno"> 1422</span>  };</div><div class="line"><a name="l01423"></a><span class="lineno"> 1423</span>  this->_M_set_result(_S_task_setter(this->_M_result, __boundfn));</div><div class="line"><a name="l01424"></a><span class="lineno"> 1424</span>  }</div><div class="line"><a name="l01425"></a><span class="lineno"> 1425</span> </div><div class="line"><a name="l01426"></a><span class="lineno"> 1426</span>  virtual void</div><div class="line"><a name="l01427"></a><span class="lineno"> 1427</span>  _M_run_delayed(_Args&&... __args, weak_ptr<_State_base> __self)</div><div class="line"><a name="l01428"></a><span class="lineno"> 1428</span>  {</div><div class="line"><a name="l01429"></a><span class="lineno"> 1429</span>  auto __boundfn = [&] () -> typename result_of<_Fn&(_Args&&...)>::type {</div><div class="line"><a name="l01430"></a><span class="lineno"> 1430</span>  return std::__invoke(_M_impl._M_fn, std::forward<_Args>(__args)...);</div><div class="line"><a name="l01431"></a><span class="lineno"> 1431</span>  };</div><div class="line"><a name="l01432"></a><span class="lineno"> 1432</span>  this->_M_set_delayed_result(_S_task_setter(this->_M_result, __boundfn),</div><div class="line"><a name="l01433"></a><span class="lineno"> 1433</span>  std::move(__self));</div><div class="line"><a name="l01434"></a><span class="lineno"> 1434</span>  }</div><div class="line"><a name="l01435"></a><span class="lineno"> 1435</span> </div><div class="line"><a name="l01436"></a><span class="lineno"> 1436</span>  virtual shared_ptr<_Task_state_base<_Res(_Args...)>></div><div class="line"><a name="l01437"></a><span class="lineno"> 1437</span>  _M_reset();</div><div class="line"><a name="l01438"></a><span class="lineno"> 1438</span> </div><div class="line"><a name="l01439"></a><span class="lineno"> 1439</span>  struct _Impl : _Alloc</div><div class="line"><a name="l01440"></a><span class="lineno"> 1440</span>  {</div><div class="line"><a name="l01441"></a><span class="lineno"> 1441</span>  template<typename _Fn2></div><div class="line"><a name="l01442"></a><span class="lineno"> 1442</span>  _Impl(_Fn2&& __fn, const _Alloc& __a)</div><div class="line"><a name="l01443"></a><span class="lineno"> 1443</span>  : _Alloc(__a), _M_fn(std::forward<_Fn2>(__fn)) { }</div><div class="line"><a name="l01444"></a><span class="lineno"> 1444</span>  _Fn _M_fn;</div><div class="line"><a name="l01445"></a><span class="lineno"> 1445</span>  } _M_impl;</div><div class="line"><a name="l01446"></a><span class="lineno"> 1446</span>  };</div><div class="line"><a name="l01447"></a><span class="lineno"> 1447</span> </div><div class="line"><a name="l01448"></a><span class="lineno"> 1448</span>  template<typename _Signature, typename _Fn, typename _Alloc></div><div class="line"><a name="l01449"></a><span class="lineno"> 1449</span>  static shared_ptr<__future_base::_Task_state_base<_Signature>></div><div class="line"><a name="l01450"></a><span class="lineno"> 1450</span>  __create_task_state(_Fn&& __fn, const _Alloc& __a)</div><div class="line"><a name="l01451"></a><span class="lineno"> 1451</span>  {</div><div class="line"><a name="l01452"></a><span class="lineno"> 1452</span>  typedef typename decay<_Fn>::type _Fn2;</div><div class="line"><a name="l01453"></a><span class="lineno"> 1453</span>  typedef __future_base::_Task_state<_Fn2, _Alloc, _Signature> _State;</div><div class="line"><a name="l01454"></a><span class="lineno"> 1454</span>  return std::allocate_shared<_State>(__a, std::forward<_Fn>(__fn), __a);</div><div class="line"><a name="l01455"></a><span class="lineno"> 1455</span>  }</div><div class="line"><a name="l01456"></a><span class="lineno"> 1456</span> </div><div class="line"><a name="l01457"></a><span class="lineno"> 1457</span>  template<typename _Fn, typename _Alloc, typename _Res, typename... _Args></div><div class="line"><a name="l01458"></a><span class="lineno"> 1458</span>  shared_ptr<__future_base::_Task_state_base<_Res(_Args...)>></div><div class="line"><a name="l01459"></a><span class="lineno"> 1459</span>  __future_base::_Task_state<_Fn, _Alloc, _Res(_Args...)>::_M_reset()</div><div class="line"><a name="l01460"></a><span class="lineno"> 1460</span>  {</div><div class="line"><a name="l01461"></a><span class="lineno"> 1461</span>  return __create_task_state<_Res(_Args...)>(std::move(_M_impl._M_fn),</div><div class="line"><a name="l01462"></a><span class="lineno"> 1462</span>  static_cast<_Alloc&>(_M_impl));</div><div class="line"><a name="l01463"></a><span class="lineno"> 1463</span>  }</div><div class="line"><a name="l01464"></a><span class="lineno"> 1464</span> </div><div class="line"><a name="l01465"></a><span class="lineno"> 1465</span>  template<typename _Task, typename _Fn, bool</div><div class="line"><a name="l01466"></a><span class="lineno"> 1466</span>  = is_same<_Task, typename decay<_Fn>::type>::value></div><div class="line"><a name="l01467"></a><span class="lineno"> 1467</span>  struct __constrain_pkgdtask</div><div class="line"><a name="l01468"></a><span class="lineno"> 1468</span>  { typedef void __type; };</div><div class="line"><a name="l01469"></a><span class="lineno"> 1469</span> </div><div class="line"><a name="l01470"></a><span class="lineno"> 1470</span>  template<typename _Task, typename _Fn></div><div class="line"><a name="l01471"></a><span class="lineno"> 1471</span>  struct __constrain_pkgdtask<_Task, _Fn, true></div><div class="line"><a name="l01472"></a><span class="lineno"> 1472</span>  { };</div><div class="line"><a name="l01473"></a><span class="lineno"> 1473</span> </div><div class="line"><a name="l01474"></a><span class="lineno"> 1474</span>  /// packaged_task</div><div class="line"><a name="l01475"></a><span class="lineno"> 1475</span>  template<typename _Res, typename... _ArgTypes></div><div class="line"><a name="l01476"></a><span class="lineno"> 1476</span>  class packaged_task<_Res(_ArgTypes...)></div><div class="line"><a name="l01477"></a><span class="lineno"> 1477</span>  {</div><div class="line"><a name="l01478"></a><span class="lineno"> 1478</span>  typedef __future_base::_Task_state_base<_Res(_ArgTypes...)> _State_type;</div><div class="line"><a name="l01479"></a><span class="lineno"> 1479</span>  shared_ptr<_State_type> _M_state;</div><div class="line"><a name="l01480"></a><span class="lineno"> 1480</span> </div><div class="line"><a name="l01481"></a><span class="lineno"> 1481</span>  public:</div><div class="line"><a name="l01482"></a><span class="lineno"> 1482</span>  // Construction and destruction</div><div class="line"><a name="l01483"></a><span class="lineno"> 1483</span>  packaged_task() noexcept { }</div><div class="line"><a name="l01484"></a><span class="lineno"> 1484</span> </div><div class="line"><a name="l01485"></a><span class="lineno"> 1485</span>  // _GLIBCXX_RESOLVE_LIB_DEFECTS</div><div class="line"><a name="l01486"></a><span class="lineno"> 1486</span>  // 2095. missing constructors needed for uses-allocator construction</div><div class="line"><a name="l01487"></a><span class="lineno"> 1487</span>  template<typename _Allocator></div><div class="line"><a name="l01488"></a><span class="lineno"> 1488</span>  packaged_task(allocator_arg_t, const _Allocator& __a) noexcept</div><div class="line"><a name="l01489"></a><span class="lineno"> 1489</span>  { }</div><div class="line"><a name="l01490"></a><span class="lineno"> 1490</span> </div><div class="line"><a name="l01491"></a><span class="lineno"> 1491</span>  template<typename _Fn, typename = typename</div><div class="line"><a name="l01492"></a><span class="lineno"> 1492</span>  __constrain_pkgdtask<packaged_task, _Fn>::__type></div><div class="line"><a name="l01493"></a><span class="lineno"> 1493</span>  explicit</div><div class="line"><a name="l01494"></a><span class="lineno"> 1494</span>  packaged_task(_Fn&& __fn)</div><div class="line"><a name="l01495"></a><span class="lineno"> 1495</span>  : packaged_task(allocator_arg, std::allocator<int>(),</div><div class="line"><a name="l01496"></a><span class="lineno"> 1496</span>  std::forward<_Fn>(__fn))</div><div class="line"><a name="l01497"></a><span class="lineno"> 1497</span>  { }</div><div class="line"><a name="l01498"></a><span class="lineno"> 1498</span> </div><div class="line"><a name="l01499"></a><span class="lineno"> 1499</span>  // _GLIBCXX_RESOLVE_LIB_DEFECTS</div><div class="line"><a name="l01500"></a><span class="lineno"> 1500</span>  // 2097. packaged_task constructors should be constrained</div><div class="line"><a name="l01501"></a><span class="lineno"> 1501</span>  // 2407. [this constructor should not be] explicit</div><div class="line"><a name="l01502"></a><span class="lineno"> 1502</span>  template<typename _Fn, typename _Alloc, typename = typename</div><div class="line"><a name="l01503"></a><span class="lineno"> 1503</span>  __constrain_pkgdtask<packaged_task, _Fn>::__type></div><div class="line"><a name="l01504"></a><span class="lineno"> 1504</span>  packaged_task(allocator_arg_t, const _Alloc& __a, _Fn&& __fn)</div><div class="line"><a name="l01505"></a><span class="lineno"> 1505</span>  : _M_state(__create_task_state<_Res(_ArgTypes...)>(</div><div class="line"><a name="l01506"></a><span class="lineno"> 1506</span>  std::forward<_Fn>(__fn), __a))</div><div class="line"><a name="l01507"></a><span class="lineno"> 1507</span>  { }</div><div class="line"><a name="l01508"></a><span class="lineno"> 1508</span> </div><div class="line"><a name="l01509"></a><span class="lineno"> 1509</span>  ~packaged_task()</div><div class="line"><a name="l01510"></a><span class="lineno"> 1510</span>  {</div><div class="line"><a name="l01511"></a><span class="lineno"> 1511</span>  if (static_cast<bool>(_M_state) && !_M_state.unique())</div><div class="line"><a name="l01512"></a><span class="lineno"> 1512</span>  _M_state->_M_break_promise(std::move(_M_state->_M_result));</div><div class="line"><a name="l01513"></a><span class="lineno"> 1513</span>  }</div><div class="line"><a name="l01514"></a><span class="lineno"> 1514</span> </div><div class="line"><a name="l01515"></a><span class="lineno"> 1515</span>  // No copy</div><div class="line"><a name="l01516"></a><span class="lineno"> 1516</span>  packaged_task(const packaged_task&) = delete;</div><div class="line"><a name="l01517"></a><span class="lineno"> 1517</span>  packaged_task& operator=(const packaged_task&) = delete;</div><div class="line"><a name="l01518"></a><span class="lineno"> 1518</span> </div><div class="line"><a name="l01519"></a><span class="lineno"> 1519</span>  template<typename _Allocator></div><div class="line"><a name="l01520"></a><span class="lineno"> 1520</span>  packaged_task(allocator_arg_t, const _Allocator&,</div><div class="line"><a name="l01521"></a><span class="lineno"> 1521</span>  const packaged_task&) = delete;</div><div class="line"><a name="l01522"></a><span class="lineno"> 1522</span> </div><div class="line"><a name="l01523"></a><span class="lineno"> 1523</span>  // Move support</div><div class="line"><a name="l01524"></a><span class="lineno"> 1524</span>  packaged_task(packaged_task&& __other) noexcept</div><div class="line"><a name="l01525"></a><span class="lineno"> 1525</span>  { this->swap(__other); }</div><div class="line"><a name="l01526"></a><span class="lineno"> 1526</span> </div><div class="line"><a name="l01527"></a><span class="lineno"> 1527</span>  template<typename _Allocator></div><div class="line"><a name="l01528"></a><span class="lineno"> 1528</span>  packaged_task(allocator_arg_t, const _Allocator&,</div><div class="line"><a name="l01529"></a><span class="lineno"> 1529</span>  packaged_task&& __other) noexcept</div><div class="line"><a name="l01530"></a><span class="lineno"> 1530</span>  { this->swap(__other); }</div><div class="line"><a name="l01531"></a><span class="lineno"> 1531</span> </div><div class="line"><a name="l01532"></a><span class="lineno"> 1532</span>  packaged_task& operator=(packaged_task&& __other) noexcept</div><div class="line"><a name="l01533"></a><span class="lineno"> 1533</span>  {</div><div class="line"><a name="l01534"></a><span class="lineno"> 1534</span>  packaged_task(std::move(__other)).swap(*this);</div><div class="line"><a name="l01535"></a><span class="lineno"> 1535</span>  return *this;</div><div class="line"><a name="l01536"></a><span class="lineno"> 1536</span>  }</div><div class="line"><a name="l01537"></a><span class="lineno"> 1537</span> </div><div class="line"><a name="l01538"></a><span class="lineno"> 1538</span>  void</div><div class="line"><a name="l01539"></a><span class="lineno"> 1539</span>  swap(packaged_task& __other) noexcept</div><div class="line"><a name="l01540"></a><span class="lineno"> 1540</span>  { _M_state.swap(__other._M_state); }</div><div class="line"><a name="l01541"></a><span class="lineno"> 1541</span> </div><div class="line"><a name="l01542"></a><span class="lineno"> 1542</span>  bool</div><div class="line"><a name="l01543"></a><span class="lineno"> 1543</span>  valid() const noexcept</div><div class="line"><a name="l01544"></a><span class="lineno"> 1544</span>  { return static_cast<bool>(_M_state); }</div><div class="line"><a name="l01545"></a><span class="lineno"> 1545</span> </div><div class="line"><a name="l01546"></a><span class="lineno"> 1546</span>  // Result retrieval</div><div class="line"><a name="l01547"></a><span class="lineno"> 1547</span>  future<_Res></div><div class="line"><a name="l01548"></a><span class="lineno"> 1548</span>  get_future()</div><div class="line"><a name="l01549"></a><span class="lineno"> 1549</span>  { return future<_Res>(_M_state); }</div><div class="line"><a name="l01550"></a><span class="lineno"> 1550</span> </div><div class="line"><a name="l01551"></a><span class="lineno"> 1551</span>  // Execution</div><div class="line"><a name="l01552"></a><span class="lineno"> 1552</span>  void</div><div class="line"><a name="l01553"></a><span class="lineno"> 1553</span>  operator()(_ArgTypes... __args)</div><div class="line"><a name="l01554"></a><span class="lineno"> 1554</span>  {</div><div class="line"><a name="l01555"></a><span class="lineno"> 1555</span>  __future_base::_State_base::_S_check(_M_state);</div><div class="line"><a name="l01556"></a><span class="lineno"> 1556</span>  _M_state->_M_run(std::forward<_ArgTypes>(__args)...);</div><div class="line"><a name="l01557"></a><span class="lineno"> 1557</span>  }</div><div class="line"><a name="l01558"></a><span class="lineno"> 1558</span> </div><div class="line"><a name="l01559"></a><span class="lineno"> 1559</span>  void</div><div class="line"><a name="l01560"></a><span class="lineno"> 1560</span>  make_ready_at_thread_exit(_ArgTypes... __args)</div><div class="line"><a name="l01561"></a><span class="lineno"> 1561</span>  {</div><div class="line"><a name="l01562"></a><span class="lineno"> 1562</span>  __future_base::_State_base::_S_check(_M_state);</div><div class="line"><a name="l01563"></a><span class="lineno"> 1563</span>  _M_state->_M_run_delayed(std::forward<_ArgTypes>(__args)..., _M_state);</div><div class="line"><a name="l01564"></a><span class="lineno"> 1564</span>  }</div><div class="line"><a name="l01565"></a><span class="lineno"> 1565</span> </div><div class="line"><a name="l01566"></a><span class="lineno"> 1566</span>  void</div><div class="line"><a name="l01567"></a><span class="lineno"> 1567</span>  reset()</div><div class="line"><a name="l01568"></a><span class="lineno"> 1568</span>  {</div><div class="line"><a name="l01569"></a><span class="lineno"> 1569</span>  __future_base::_State_base::_S_check(_M_state);</div><div class="line"><a name="l01570"></a><span class="lineno"> 1570</span>  packaged_task __tmp;</div><div class="line"><a name="l01571"></a><span class="lineno"> 1571</span>  __tmp._M_state = _M_state;</div><div class="line"><a name="l01572"></a><span class="lineno"> 1572</span>  _M_state = _M_state->_M_reset();</div><div class="line"><a name="l01573"></a><span class="lineno"> 1573</span>  }</div><div class="line"><a name="l01574"></a><span class="lineno"> 1574</span>  };</div><div class="line"><a name="l01575"></a><span class="lineno"> 1575</span> </div><div class="line"><a name="l01576"></a><span class="lineno"> 1576</span>  /// swap</div><div class="line"><a name="l01577"></a><span class="lineno"> 1577</span>  template<typename _Res, typename... _ArgTypes></div><div class="line"><a name="l01578"></a><span class="lineno"> 1578</span>  inline void</div><div class="line"><a name="l01579"></a><span class="lineno"> 1579</span>  swap(packaged_task<_Res(_ArgTypes...)>& __x,</div><div class="line"><a name="l01580"></a><span class="lineno"> 1580</span>  packaged_task<_Res(_ArgTypes...)>& __y) noexcept</div><div class="line"><a name="l01581"></a><span class="lineno"> 1581</span>  { __x.swap(__y); }</div><div class="line"><a name="l01582"></a><span class="lineno"> 1582</span> </div><div class="line"><a name="l01583"></a><span class="lineno"> 1583</span>  template<typename _Res, typename _Alloc></div><div class="line"><a name="l01584"></a><span class="lineno"> 1584</span>  struct uses_allocator<packaged_task<_Res>, _Alloc></div><div class="line"><a name="l01585"></a><span class="lineno"> 1585</span>  : public true_type { };</div><div class="line"><a name="l01586"></a><span class="lineno"> 1586</span> </div><div class="line"><a name="l01587"></a><span class="lineno"> 1587</span> </div><div class="line"><a name="l01588"></a><span class="lineno"> 1588</span>  // Shared state created by std::async().</div><div class="line"><a name="l01589"></a><span class="lineno"> 1589</span>  // Holds a deferred function and storage for its result.</div><div class="line"><a name="l01590"></a><span class="lineno"> 1590</span>  template<typename _BoundFn, typename _Res></div><div class="line"><a name="l01591"></a><span class="lineno"> 1591</span>  class __future_base::_Deferred_state final</div><div class="line"><a name="l01592"></a><span class="lineno"> 1592</span>  : public __future_base::_State_base</div><div class="line"><a name="l01593"></a><span class="lineno"> 1593</span>  {</div><div class="line"><a name="l01594"></a><span class="lineno"> 1594</span>  public:</div><div class="line"><a name="l01595"></a><span class="lineno"> 1595</span>  explicit</div><div class="line"><a name="l01596"></a><span class="lineno"> 1596</span>  _Deferred_state(_BoundFn&& __fn)</div><div class="line"><a name="l01597"></a><span class="lineno"> 1597</span>  : _M_result(new _Result<_Res>()), _M_fn(std::move(__fn))</div><div class="line"><a name="l01598"></a><span class="lineno"> 1598</span>  { }</div><div class="line"><a name="l01599"></a><span class="lineno"> 1599</span> </div><div class="line"><a name="l01600"></a><span class="lineno"> 1600</span>  private:</div><div class="line"><a name="l01601"></a><span class="lineno"> 1601</span>  typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type;</div><div class="line"><a name="l01602"></a><span class="lineno"> 1602</span>  _Ptr_type _M_result;</div><div class="line"><a name="l01603"></a><span class="lineno"> 1603</span>  _BoundFn _M_fn;</div><div class="line"><a name="l01604"></a><span class="lineno"> 1604</span> </div><div class="line"><a name="l01605"></a><span class="lineno"> 1605</span>  // Run the deferred function.</div><div class="line"><a name="l01606"></a><span class="lineno"> 1606</span>  virtual void</div><div class="line"><a name="l01607"></a><span class="lineno"> 1607</span>  _M_complete_async()</div><div class="line"><a name="l01608"></a><span class="lineno"> 1608</span>  {</div><div class="line"><a name="l01609"></a><span class="lineno"> 1609</span>  // Multiple threads can call a waiting function on the future and</div><div class="line"><a name="l01610"></a><span class="lineno"> 1610</span>  // reach this point at the same time. The call_once in _M_set_result</div><div class="line"><a name="l01611"></a><span class="lineno"> 1611</span>  // ensures only the first one run the deferred function, stores the</div><div class="line"><a name="l01612"></a><span class="lineno"> 1612</span>  // result in _M_result, swaps that with the base _M_result and makes</div><div class="line"><a name="l01613"></a><span class="lineno"> 1613</span>  // the state ready. Tell _M_set_result to ignore failure so all later</div><div class="line"><a name="l01614"></a><span class="lineno"> 1614</span>  // calls do nothing.</div><div class="line"><a name="l01615"></a><span class="lineno"> 1615</span>  _M_set_result(_S_task_setter(_M_result, _M_fn), true);</div><div class="line"><a name="l01616"></a><span class="lineno"> 1616</span>  }</div><div class="line"><a name="l01617"></a><span class="lineno"> 1617</span> </div><div class="line"><a name="l01618"></a><span class="lineno"> 1618</span>  // Caller should check whether the state is ready first, because this</div><div class="line"><a name="l01619"></a><span class="lineno"> 1619</span>  // function will return true even after the deferred function has run.</div><div class="line"><a name="l01620"></a><span class="lineno"> 1620</span>  virtual bool _M_is_deferred_future() const { return true; }</div><div class="line"><a name="l01621"></a><span class="lineno"> 1621</span>  };</div><div class="line"><a name="l01622"></a><span class="lineno"> 1622</span> </div><div class="line"><a name="l01623"></a><span class="lineno"> 1623</span>  // Common functionality hoisted out of the _Async_state_impl template.</div><div class="line"><a name="l01624"></a><span class="lineno"> 1624</span>  class __future_base::_Async_state_commonV2</div><div class="line"><a name="l01625"></a><span class="lineno"> 1625</span>  : public __future_base::_State_base</div><div class="line"><a name="l01626"></a><span class="lineno"> 1626</span>  {</div><div class="line"><a name="l01627"></a><span class="lineno"> 1627</span>  protected:</div><div class="line"><a name="l01628"></a><span class="lineno"> 1628</span>  ~_Async_state_commonV2() = default;</div><div class="line"><a name="l01629"></a><span class="lineno"> 1629</span> </div><div class="line"><a name="l01630"></a><span class="lineno"> 1630</span>  // Make waiting functions block until the thread completes, as if joined.</div><div class="line"><a name="l01631"></a><span class="lineno"> 1631</span>  //</div><div class="line"><a name="l01632"></a><span class="lineno"> 1632</span>  // This function is used by wait() to satisfy the first requirement below</div><div class="line"><a name="l01633"></a><span class="lineno"> 1633</span>  // and by wait_for() / wait_until() to satisfy the second.</div><div class="line"><a name="l01634"></a><span class="lineno"> 1634</span>  //</div><div class="line"><a name="l01635"></a><span class="lineno"> 1635</span>  // [futures.async]:</div><div class="line"><a name="l01636"></a><span class="lineno"> 1636</span>  //</div><div class="line"><a name="l01637"></a><span class="lineno"> 1637</span>  // — a call to a waiting function on an asynchronous return object that</div><div class="line"><a name="l01638"></a><span class="lineno"> 1638</span>  // shares the shared state created by this async call shall block until</div><div class="line"><a name="l01639"></a><span class="lineno"> 1639</span>  // the associated thread has completed, as if joined, or else time out.</div><div class="line"><a name="l01640"></a><span class="lineno"> 1640</span>  //</div><div class="line"><a name="l01641"></a><span class="lineno"> 1641</span>  // — the associated thread completion synchronizes with the return from</div><div class="line"><a name="l01642"></a><span class="lineno"> 1642</span>  // the first function that successfully detects the ready status of the</div><div class="line"><a name="l01643"></a><span class="lineno"> 1643</span>  // shared state or with the return from the last function that releases</div><div class="line"><a name="l01644"></a><span class="lineno"> 1644</span>  // the shared state, whichever happens first.</div><div class="line"><a name="l01645"></a><span class="lineno"> 1645</span>  virtual void _M_complete_async() { _M_join(); }</div><div class="line"><a name="l01646"></a><span class="lineno"> 1646</span> </div><div class="line"><a name="l01647"></a><span class="lineno"> 1647</span>  void _M_join() { std::call_once(_M_once, &thread::join, &_M_thread); }</div><div class="line"><a name="l01648"></a><span class="lineno"> 1648</span> </div><div class="line"><a name="l01649"></a><span class="lineno"> 1649</span>  thread _M_thread;</div><div class="line"><a name="l01650"></a><span class="lineno"> 1650</span>  once_flag _M_once;</div><div class="line"><a name="l01651"></a><span class="lineno"> 1651</span>  };</div><div class="line"><a name="l01652"></a><span class="lineno"> 1652</span> </div><div class="line"><a name="l01653"></a><span class="lineno"> 1653</span>  // Shared state created by std::async().</div><div class="line"><a name="l01654"></a><span class="lineno"> 1654</span>  // Starts a new thread that runs a function and makes the shared state ready.</div><div class="line"><a name="l01655"></a><span class="lineno"> 1655</span>  template<typename _BoundFn, typename _Res></div><div class="line"><a name="l01656"></a><span class="lineno"> 1656</span>  class __future_base::_Async_state_impl final</div><div class="line"><a name="l01657"></a><span class="lineno"> 1657</span>  : public __future_base::_Async_state_commonV2</div><div class="line"><a name="l01658"></a><span class="lineno"> 1658</span>  {</div><div class="line"><a name="l01659"></a><span class="lineno"> 1659</span>  public:</div><div class="line"><a name="l01660"></a><span class="lineno"> 1660</span>  explicit</div><div class="line"><a name="l01661"></a><span class="lineno"> 1661</span>  _Async_state_impl(_BoundFn&& __fn)</div><div class="line"><a name="l01662"></a><span class="lineno"> 1662</span>  : _M_result(new _Result<_Res>()), _M_fn(std::move(__fn))</div><div class="line"><a name="l01663"></a><span class="lineno"> 1663</span>  {</div><div class="line"><a name="l01664"></a><span class="lineno"> 1664</span>  _M_thread = std::thread{ [this] {</div><div class="line"><a name="l01665"></a><span class="lineno"> 1665</span>  __try</div><div class="line"><a name="l01666"></a><span class="lineno"> 1666</span>  {</div><div class="line"><a name="l01667"></a><span class="lineno"> 1667</span>  _M_set_result(_S_task_setter(_M_result, _M_fn));</div><div class="line"><a name="l01668"></a><span class="lineno"> 1668</span>  }</div><div class="line"><a name="l01669"></a><span class="lineno"> 1669</span>  __catch (const __cxxabiv1::__forced_unwind&)</div><div class="line"><a name="l01670"></a><span class="lineno"> 1670</span>  {</div><div class="line"><a name="l01671"></a><span class="lineno"> 1671</span>  // make the shared state ready on thread cancellation</div><div class="line"><a name="l01672"></a><span class="lineno"> 1672</span>  if (static_cast<bool>(_M_result))</div><div class="line"><a name="l01673"></a><span class="lineno"> 1673</span>  this->_M_break_promise(std::move(_M_result));</div><div class="line"><a name="l01674"></a><span class="lineno"> 1674</span>  __throw_exception_again;</div><div class="line"><a name="l01675"></a><span class="lineno"> 1675</span>  }</div><div class="line"><a name="l01676"></a><span class="lineno"> 1676</span>  } };</div><div class="line"><a name="l01677"></a><span class="lineno"> 1677</span>  }</div><div class="line"><a name="l01678"></a><span class="lineno"> 1678</span> </div><div class="line"><a name="l01679"></a><span class="lineno"> 1679</span>  // Must not destroy _M_result and _M_fn until the thread finishes.</div><div class="line"><a name="l01680"></a><span class="lineno"> 1680</span>  // Call join() directly rather than through _M_join() because no other</div><div class="line"><a name="l01681"></a><span class="lineno"> 1681</span>  // thread can be referring to this state if it is being destroyed.</div><div class="line"><a name="l01682"></a><span class="lineno"> 1682</span>  ~_Async_state_impl() { if (_M_thread.joinable()) _M_thread.join(); }</div><div class="line"><a name="l01683"></a><span class="lineno"> 1683</span> </div><div class="line"><a name="l01684"></a><span class="lineno"> 1684</span>  private:</div><div class="line"><a name="l01685"></a><span class="lineno"> 1685</span>  typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type;</div><div class="line"><a name="l01686"></a><span class="lineno"> 1686</span>  _Ptr_type _M_result;</div><div class="line"><a name="l01687"></a><span class="lineno"> 1687</span>  _BoundFn _M_fn;</div><div class="line"><a name="l01688"></a><span class="lineno"> 1688</span>  };</div><div class="line"><a name="l01689"></a><span class="lineno"> 1689</span> </div><div class="line"><a name="l01690"></a><span class="lineno"> 1690</span>  template<typename _BoundFn></div><div class="line"><a name="l01691"></a><span class="lineno"> 1691</span>  inline std::shared_ptr<__future_base::_State_base></div><div class="line"><a name="l01692"></a><span class="lineno"> 1692</span>  __future_base::_S_make_deferred_state(_BoundFn&& __fn)</div><div class="line"><a name="l01693"></a><span class="lineno"> 1693</span>  {</div><div class="line"><a name="l01694"></a><span class="lineno"> 1694</span>  typedef typename remove_reference<_BoundFn>::type __fn_type;</div><div class="line"><a name="l01695"></a><span class="lineno"> 1695</span>  typedef _Deferred_state<__fn_type> __state_type;</div><div class="line"><a name="l01696"></a><span class="lineno"> 1696</span>  return std::make_shared<__state_type>(std::move(__fn));</div><div class="line"><a name="l01697"></a><span class="lineno"> 1697</span>  }</div><div class="line"><a name="l01698"></a><span class="lineno"> 1698</span> </div><div class="line"><a name="l01699"></a><span class="lineno"> 1699</span>  template<typename _BoundFn></div><div class="line"><a name="l01700"></a><span class="lineno"> 1700</span>  inline std::shared_ptr<__future_base::_State_base></div><div class="line"><a name="l01701"></a><span class="lineno"> 1701</span>  __future_base::_S_make_async_state(_BoundFn&& __fn)</div><div class="line"><a name="l01702"></a><span class="lineno"> 1702</span>  {</div><div class="line"><a name="l01703"></a><span class="lineno"> 1703</span>  typedef typename remove_reference<_BoundFn>::type __fn_type;</div><div class="line"><a name="l01704"></a><span class="lineno"> 1704</span>  typedef _Async_state_impl<__fn_type> __state_type;</div><div class="line"><a name="l01705"></a><span class="lineno"> 1705</span>  return std::make_shared<__state_type>(std::move(__fn));</div><div class="line"><a name="l01706"></a><span class="lineno"> 1706</span>  }</div><div class="line"><a name="l01707"></a><span class="lineno"> 1707</span> </div><div class="line"><a name="l01708"></a><span class="lineno"> 1708</span> </div><div class="line"><a name="l01709"></a><span class="lineno"> 1709</span>  /// async</div><div class="line"><a name="l01710"></a><span class="lineno"> 1710</span>  template<typename _Fn, typename... _Args></div><div class="line"><a name="l01711"></a><span class="lineno"> 1711</span>  future<__async_result_of<_Fn, _Args...>></div><div class="line"><a name="l01712"></a><span class="lineno"> 1712</span>  async(launch __policy, _Fn&& __fn, _Args&&... __args)</div><div class="line"><a name="l01713"></a><span class="lineno"> 1713</span>  {</div><div class="line"><a name="l01714"></a><span class="lineno"> 1714</span>  std::shared_ptr<__future_base::_State_base> __state;</div><div class="line"><a name="l01715"></a><span class="lineno"> 1715</span>  if ((__policy & launch::async) == launch::async)</div><div class="line"><a name="l01716"></a><span class="lineno"> 1716</span>  {</div><div class="line"><a name="l01717"></a><span class="lineno"> 1717</span>  __try</div><div class="line"><a name="l01718"></a><span class="lineno"> 1718</span>  {</div><div class="line"><a name="l01719"></a><span class="lineno"> 1719</span>  __state = __future_base::_S_make_async_state(</div><div class="line"><a name="l01720"></a><span class="lineno"> 1720</span>  std::thread::__make_invoker(std::forward<_Fn>(__fn),</div><div class="line"><a name="l01721"></a><span class="lineno"> 1721</span>  std::forward<_Args>(__args)...)</div><div class="line"><a name="l01722"></a><span class="lineno"> 1722</span>  );</div><div class="line"><a name="l01723"></a><span class="lineno"> 1723</span>  }</div><div class="line"><a name="l01724"></a><span class="lineno"> 1724</span> #if __cpp_exceptions</div><div class="line"><a name="l01725"></a><span class="lineno"> 1725</span>  catch(const system_error& __e)</div><div class="line"><a name="l01726"></a><span class="lineno"> 1726</span>  {</div><div class="line"><a name="l01727"></a><span class="lineno"> 1727</span>  if (__e.code() != errc::resource_unavailable_try_again</div><div class="line"><a name="l01728"></a><span class="lineno"> 1728</span>  || (__policy & launch::deferred) != launch::deferred)</div><div class="line"><a name="l01729"></a><span class="lineno"> 1729</span>  throw;</div><div class="line"><a name="l01730"></a><span class="lineno"> 1730</span>  }</div><div class="line"><a name="l01731"></a><span class="lineno"> 1731</span> #endif</div><div class="line"><a name="l01732"></a><span class="lineno"> 1732</span>  }</div><div class="line"><a name="l01733"></a><span class="lineno"> 1733</span>  if (!__state)</div><div class="line"><a name="l01734"></a><span class="lineno"> 1734</span>  {</div><div class="line"><a name="l01735"></a><span class="lineno"> 1735</span>  __state = __future_base::_S_make_deferred_state(</div><div class="line"><a name="l01736"></a><span class="lineno"> 1736</span>  std::thread::__make_invoker(std::forward<_Fn>(__fn),</div><div class="line"><a name="l01737"></a><span class="lineno"> 1737</span>  std::forward<_Args>(__args)...));</div><div class="line"><a name="l01738"></a><span class="lineno"> 1738</span>  }</div><div class="line"><a name="l01739"></a><span class="lineno"> 1739</span>  return future<__async_result_of<_Fn, _Args...>>(__state);</div><div class="line"><a name="l01740"></a><span class="lineno"> 1740</span>  }</div><div class="line"><a name="l01741"></a><span class="lineno"> 1741</span> </div><div class="line"><a name="l01742"></a><span class="lineno"> 1742</span>  /// async, potential overload</div><div class="line"><a name="l01743"></a><span class="lineno"> 1743</span>  template<typename _Fn, typename... _Args></div><div class="line"><a name="l01744"></a><span class="lineno"> 1744</span>  inline future<__async_result_of<_Fn, _Args...>></div><div class="line"><a name="l01745"></a><span class="lineno"> 1745</span>  async(_Fn&& __fn, _Args&&... __args)</div><div class="line"><a name="l01746"></a><span class="lineno"> 1746</span>  {</div><div class="line"><a name="l01747"></a><span class="lineno"> 1747</span>  return std::async(launch::async|launch::deferred,</div><div class="line"><a name="l01748"></a><span class="lineno"> 1748</span>  std::forward<_Fn>(__fn),</div><div class="line"><a name="l01749"></a><span class="lineno"> 1749</span>  std::forward<_Args>(__args)...);</div><div class="line"><a name="l01750"></a><span class="lineno"> 1750</span>  }</div><div class="line"><a name="l01751"></a><span class="lineno"> 1751</span> </div><div class="line"><a name="l01752"></a><span class="lineno"> 1752</span> #endif // _GLIBCXX_ASYNC_ABI_COMPAT</div><div class="line"><a name="l01753"></a><span class="lineno"> 1753</span> #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1</div><div class="line"><a name="l01754"></a><span class="lineno"> 1754</span> </div><div class="line"><a name="l01755"></a><span class="lineno"> 1755</span>  // @} group futures</div><div class="line"><a name="l01756"></a><span class="lineno"> 1756</span> _GLIBCXX_END_NAMESPACE_VERSION</div><div class="line"><a name="l01757"></a><span class="lineno"> 1757</span> } // namespace</div><div class="line"><a name="l01758"></a><span class="lineno"> 1758</span> </div><div class="line"><a name="l01759"></a><span class="lineno"> 1759</span> #endif // C++11</div><div class="line"><a name="l01760"></a><span class="lineno"> 1760</span> </div><div class="line"><a name="l01761"></a><span class="lineno"> 1761</span> #endif // _GLIBCXX_FUTURE</div></div><!-- fragment --></div><!-- contents -->
</div><!-- doc-content -->
<!-- start footer part -->
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
<ul>
<li class="navelem"><a class="el" href="dir_47f59b4ef76325ed55a7fd4bed4be05b.html">include</a></li><li class="navelem"><a class="el" href="a00074.html">future</a></li>
<li class="footer">Generated by
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.15 </li>
</ul>
</div>
</body>
</html>
distrib
>
Mageia
>
7
>
armv7hl
>
media
>
core-updates
>
by-pkgid
>
bfb47da7e0322bcb0e23e4b1838d9db9
>
files
>
73
