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<a href="a16821.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> // Functional extensions -*- 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) 2002-2018 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> /*</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  *</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  * Copyright (c) 1994</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  * Hewlett-Packard Company</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  *</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  * Permission to use, copy, modify, distribute and sell this software</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  * and its documentation for any purpose is hereby granted without fee,</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  * provided that the above copyright notice appear in all copies and</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  * that both that copyright notice and this permission notice appear</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  * in supporting documentation. Hewlett-Packard Company makes no</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  * representations about the suitability of this software for any</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  * purpose. It is provided "as is" without express or implied warranty.</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>  *</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  * Copyright (c) 1996</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  * Silicon Graphics Computer Systems, Inc.</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  *</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  * Permission to use, copy, modify, distribute and sell this software</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  * and its documentation for any purpose is hereby granted without fee,</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  * provided that the above copyright notice appear in all copies and</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  * that both that copyright notice and this permission notice appear</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  * in supporting documentation. Silicon Graphics makes no</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  * representations about the suitability of this software for any</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  * purpose. It is provided "as is" without express or implied warranty.</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  */</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> /** @file ext/functional</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  * This file is a GNU extension to the Standard C++ Library (possibly</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  * containing extensions from the HP/SGI STL subset).</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> </div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> #ifndef _EXT_FUNCTIONAL</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> #define _EXT_FUNCTIONAL 1</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> #pragma GCC system_header</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> #include <functional></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> namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)</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> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  using std::size_t;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  using std::unary_function;</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  using std::binary_function;</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  using std::mem_fun1_t;</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  using std::const_mem_fun1_t;</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  using std::mem_fun1_ref_t;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  using std::const_mem_fun1_ref_t;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  /** The @c identity_element functions are not part of the C++</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  * standard; SGI provided them as an extension. Its argument is an</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  * operation, and its return value is the identity element for that</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  * operation. It is overloaded for addition and multiplication,</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  * and you can overload it for your own nefarious operations.</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  *</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  * @addtogroup SGIextensions</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  * @{</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  */</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  template <class _Tp></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  inline _Tp</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  identity_element(std::plus<_Tp>)</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  { return _Tp(0); }</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  template <class _Tp></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  inline _Tp</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  identity_element(std::multiplies<_Tp>)</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  { return _Tp(1); }</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>  </div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  /** As an extension to the binders, SGI provided composition functors and</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  * wrapper functions to aid in their creation. The @c unary_compose</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  * functor is constructed from two functions/functors, @c f and @c g.</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  * Calling @c operator() with a single argument @c x returns @c f(g(x)).</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  * The function @c compose1 takes the two functions and constructs a</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  * @c unary_compose variable for you.</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>  * @c binary_compose is constructed from three functors, @c f, @c g1,</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  * and @c g2. Its @c operator() returns @c f(g1(x),g2(x)). The function</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  * compose2 takes f, g1, and g2, and constructs the @c binary_compose</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  * instance for you. For example, if @c f returns an int, then</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  * \code</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  * int answer = (compose2(f,g1,g2))(x);</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  * \endcode</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  * is equivalent to</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  * \code</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  * int temp1 = g1(x);</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  * int temp2 = g2(x);</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  * int answer = f(temp1,temp2);</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  * \endcode</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  * But the first form is more compact, and can be passed around as a</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  * functor to other algorithms.</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>  * @addtogroup SGIextensions</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>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  template <class _Operation1, class _Operation2></div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  class unary_compose</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  : public unary_function<typename _Operation2::argument_type,</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  typename _Operation1::result_type></div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  {</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  protected:</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  _Operation1 _M_fn1;</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  _Operation2 _M_fn2;</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>  public:</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  unary_compose(const _Operation1& __x, const _Operation2& __y)</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  : _M_fn1(__x), _M_fn2(__y) {}</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> </div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  typename _Operation1::result_type</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  operator()(const typename _Operation2::argument_type& __x) const</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  { return _M_fn1(_M_fn2(__x)); }</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  };</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>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  template <class _Operation1, class _Operation2></div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  inline unary_compose<_Operation1, _Operation2></div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  compose1(const _Operation1& __fn1, const _Operation2& __fn2)</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  { return unary_compose<_Operation1,_Operation2>(__fn1, __fn2); }</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>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  template <class _Operation1, class _Operation2, class _Operation3></div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  class binary_compose</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  : public unary_function<typename _Operation2::argument_type,</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  typename _Operation1::result_type></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>  protected:</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  _Operation1 _M_fn1;</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  _Operation2 _M_fn2;</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  _Operation3 _M_fn3;</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  </div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  public:</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  binary_compose(const _Operation1& __x, const _Operation2& __y,</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  const _Operation3& __z)</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  : _M_fn1(__x), _M_fn2(__y), _M_fn3(__z) { }</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>  typename _Operation1::result_type</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  operator()(const typename _Operation2::argument_type& __x) const</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  { return _M_fn1(_M_fn2(__x), _M_fn3(__x)); }</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  };</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span> </div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  template <class _Operation1, class _Operation2, class _Operation3></div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  inline binary_compose<_Operation1, _Operation2, _Operation3></div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  compose2(const _Operation1& __fn1, const _Operation2& __fn2,</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  const _Operation3& __fn3)</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  { return binary_compose<_Operation1, _Operation2, _Operation3></div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  (__fn1, __fn2, __fn3); }</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  /** @} */</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span> </div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  /** As an extension, SGI provided a functor called @c identity. When a</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  * functor is required but no operations are desired, this can be used as a</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  * pass-through. Its @c operator() returns its argument unchanged.</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  *</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  * @addtogroup SGIextensions</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  */</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  template <class _Tp></div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  struct identity</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  : public std::_Identity<_Tp> {};</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span> </div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  /** @c select1st and @c select2nd are extensions provided by SGI. Their</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  * @c operator()s</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  * take a @c std::pair as an argument, and return either the first member</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  * or the second member, respectively. They can be used (especially with</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  * the composition functors) to @a strip data from a sequence before</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  * performing the remainder of an algorithm.</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>  * @addtogroup SGIextensions</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>  */</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  template <class _Pair></div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  struct select1st</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  : public std::_Select1st<_Pair> {};</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>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  template <class _Pair></div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  struct select2nd</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  : public std::_Select2nd<_Pair> {};</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>  /** @} */</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span> </div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  // extension documented next</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  template <class _Arg1, class _Arg2></div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  struct _Project1st : public binary_function<_Arg1, _Arg2, _Arg1></div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  {</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  _Arg1</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  operator()(const _Arg1& __x, const _Arg2&) const</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  { return __x; }</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  };</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span> </div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  template <class _Arg1, class _Arg2></div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  struct _Project2nd : public binary_function<_Arg1, _Arg2, _Arg2></div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  {</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  _Arg2</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  operator()(const _Arg1&, const _Arg2& __y) const</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  { return __y; }</div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  };</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span> </div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  /** The @c operator() of the @c project1st functor takes two arbitrary</div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  * arguments and returns the first one, while @c project2nd returns the</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  * second one. They are extensions provided by SGI.</div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  *</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  * @addtogroup SGIextensions</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>  */</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span> </div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  template <class _Arg1, class _Arg2></div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  struct project1st : public _Project1st<_Arg1, _Arg2> {};</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span> </div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  template <class _Arg1, class _Arg2></div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  struct project2nd : public _Project2nd<_Arg1, _Arg2> {};</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>  // extension documented next</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  template <class _Result></div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  struct _Constant_void_fun</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>  typedef _Result result_type;</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  result_type _M_val;</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>  _Constant_void_fun(const result_type& __v) : _M_val(__v) {}</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span> </div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  const result_type&</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  operator()() const</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  { return _M_val; }</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  };</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span> </div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  template <class _Result, class _Argument></div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  struct _Constant_unary_fun</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>  typedef _Argument argument_type;</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  typedef _Result result_type;</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  result_type _M_val;</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>  _Constant_unary_fun(const result_type& __v) : _M_val(__v) {}</div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span> </div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  const result_type&</div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  operator()(const _Argument&) const</div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  { return _M_val; }</div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  };</div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span> </div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  template <class _Result, class _Arg1, class _Arg2></div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  struct _Constant_binary_fun</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>  typedef _Arg1 first_argument_type;</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  typedef _Arg2 second_argument_type;</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  typedef _Result result_type;</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  _Result _M_val;</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span> </div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  _Constant_binary_fun(const _Result& __v) : _M_val(__v) {}</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  </div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  const result_type&</div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  operator()(const _Arg1&, const _Arg2&) const</div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  { return _M_val; }</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  };</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span> </div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  /** These three functors are each constructed from a single arbitrary</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  * variable/value. Later, their @c operator()s completely ignore any</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  * arguments passed, and return the stored value.</div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  * - @c constant_void_fun's @c operator() takes no arguments</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  * - @c constant_unary_fun's @c operator() takes one argument (ignored)</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  * - @c constant_binary_fun's @c operator() takes two arguments (ignored)</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  *</div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  * The helper creator functions @c constant0, @c constant1, and</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  * @c constant2 each take a @a result argument and construct variables of</div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  * the appropriate functor type.</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>  * @addtogroup SGIextensions</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  * @{</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  */</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  template <class _Result></div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  struct constant_void_fun</div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  : public _Constant_void_fun<_Result></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>  constant_void_fun(const _Result& __v)</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  : _Constant_void_fun<_Result>(__v) {}</div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  };</div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span> </div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  template <class _Result, class _Argument = _Result></div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  struct constant_unary_fun : public _Constant_unary_fun<_Result, _Argument></div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  {</div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  constant_unary_fun(const _Result& __v)</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  : _Constant_unary_fun<_Result, _Argument>(__v) {}</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>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  template <class _Result, class _Arg1 = _Result, class _Arg2 = _Arg1></div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  struct constant_binary_fun</div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  : public _Constant_binary_fun<_Result, _Arg1, _Arg2></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>  constant_binary_fun(const _Result& __v)</div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  : _Constant_binary_fun<_Result, _Arg1, _Arg2>(__v) {}</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> </div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  template <class _Result></div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  inline constant_void_fun<_Result></div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  constant0(const _Result& __val)</div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  { return constant_void_fun<_Result>(__val); }</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>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  template <class _Result></div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  inline constant_unary_fun<_Result, _Result></div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  constant1(const _Result& __val)</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  { return constant_unary_fun<_Result, _Result>(__val); }</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span> </div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  /// An \link SGIextensions SGI extension \endlink.</div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  template <class _Result></div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  inline constant_binary_fun<_Result,_Result,_Result></div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  constant2(const _Result& __val)</div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  { return constant_binary_fun<_Result, _Result, _Result>(__val); }</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> </div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  /** The @c subtractive_rng class is documented on</div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  * <a href="http://www.sgi.com/tech/stl/">SGI's site</a>.</div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  * Note that this code assumes that @c int is 32 bits.</div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  *</div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  * @ingroup SGIextensions</div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  */</div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  class subtractive_rng</div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  : public unary_function<unsigned int, unsigned int></div><div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  {</div><div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  private:</div><div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  unsigned int _M_table[55];</div><div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  size_t _M_index1;</div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  size_t _M_index2;</div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span> </div><div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  public:</div><div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  /// Returns a number less than the argument.</div><div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  unsigned int</div><div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  operator()(unsigned int __limit)</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>  _M_index1 = (_M_index1 + 1) % 55;</div><div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  _M_index2 = (_M_index2 + 1) % 55;</div><div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  _M_table[_M_index1] = _M_table[_M_index1] - _M_table[_M_index2];</div><div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  return _M_table[_M_index1] % __limit;</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> </div><div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  void</div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  _M_initialize(unsigned int __seed)</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>  unsigned int __k = 1;</div><div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  _M_table[54] = __seed;</div><div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  size_t __i;</div><div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  for (__i = 0; __i < 54; __i++)</div><div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  {</div><div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  size_t __ii = (21 * (__i + 1) % 55) - 1;</div><div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  _M_table[__ii] = __k;</div><div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  __k = __seed - __k;</div><div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  __seed = _M_table[__ii];</div><div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  }</div><div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  for (int __loop = 0; __loop < 4; __loop++)</div><div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  {</div><div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  for (__i = 0; __i < 55; __i++)</div><div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  _M_table[__i] = _M_table[__i] - _M_table[(1 + __i + 30) % 55];</div><div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  }</div><div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  _M_index1 = 0;</div><div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  _M_index2 = 31;</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>  /// Ctor allowing you to initialize the seed.</div><div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  subtractive_rng(unsigned int __seed)</div><div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  { _M_initialize(__seed); }</div><div class="line"><a name="l00396"></a><span class="lineno"> 396</span> </div><div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  /// Default ctor; initializes its state with some number you don't see.</div><div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  subtractive_rng()</div><div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  { _M_initialize(161803398u); }</div><div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  };</div><div class="line"><a name="l00401"></a><span class="lineno"> 401</span> </div><div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  // Mem_fun adaptor helper functions mem_fun1 and mem_fun1_ref,</div><div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  // provided for backward compatibility, they are no longer part of</div><div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  // the C++ standard.</div><div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  </div><div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  template <class _Ret, class _Tp, class _Arg></div><div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  inline mem_fun1_t<_Ret, _Tp, _Arg></div><div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  mem_fun1(_Ret (_Tp::*__f)(_Arg))</div><div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  { return mem_fun1_t<_Ret, _Tp, _Arg>(__f); }</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>  template <class _Ret, class _Tp, class _Arg></div><div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  inline const_mem_fun1_t<_Ret, _Tp, _Arg></div><div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  mem_fun1(_Ret (_Tp::*__f)(_Arg) const)</div><div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  { return const_mem_fun1_t<_Ret, _Tp, _Arg>(__f); }</div><div class="line"><a name="l00415"></a><span class="lineno"> 415</span> </div><div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  template <class _Ret, class _Tp, class _Arg></div><div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  inline mem_fun1_ref_t<_Ret, _Tp, _Arg></div><div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  mem_fun1_ref(_Ret (_Tp::*__f)(_Arg))</div><div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  { return mem_fun1_ref_t<_Ret, _Tp, _Arg>(__f); }</div><div class="line"><a name="l00420"></a><span class="lineno"> 420</span> </div><div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  template <class _Ret, class _Tp, class _Arg></div><div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  inline const_mem_fun1_ref_t<_Ret, _Tp, _Arg></div><div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  mem_fun1_ref(_Ret (_Tp::*__f)(_Arg) const)</div><div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  { return const_mem_fun1_ref_t<_Ret, _Tp, _Arg>(__f); }</div><div class="line"><a name="l00425"></a><span class="lineno"> 425</span> </div><div class="line"><a name="l00426"></a><span class="lineno"> 426</span> _GLIBCXX_END_NAMESPACE_VERSION</div><div class="line"><a name="l00427"></a><span class="lineno"> 427</span> } // namespace</div><div class="line"><a name="l00428"></a><span class="lineno"> 428</span> </div><div class="line"><a name="l00429"></a><span class="lineno"> 429</span> #endif</div><div class="line"><a name="l00430"></a><span class="lineno"> 430</span> </div></div><!-- fragment --></div><!-- contents -->
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