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<a href="a16818.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Functional extensions -*- C++ -*-</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Copyright (C) 2002-2018 Free Software Foundation, Inc.</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// This file is part of the GNU ISO C++ Library. This library is free</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// software; you can redistribute it and/or modify it under the</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// terms of the GNU General Public License as published by the</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Free Software Foundation; either version 3, or (at your option)</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// any later version.</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// This library is distributed in the hope that it will be useful,</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// GNU General Public License for more details.</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// Under Section 7 of GPL version 3, you are granted additional</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// permissions described in the GCC Runtime Library Exception, version</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// 3.1, as published by the Free Software Foundation.</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// You should have received a copy of the GNU General Public License and</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// a copy of the GCC Runtime Library Exception along with this program;</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// <http://www.gnu.org/licenses/>.</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">/*</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> *</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * Copyright (c) 1994</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * Hewlett-Packard Company</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> *</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * Permission to use, copy, modify, distribute and sell this software</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * and its documentation for any purpose is hereby granted without fee,</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * provided that the above copyright notice appear in all copies and</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * that both that copyright notice and this permission notice appear</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * in supporting documentation. Hewlett-Packard Company makes no</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * representations about the suitability of this software for any</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> * purpose. It is provided "as is" without express or implied warranty.</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> *</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> *</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * Copyright (c) 1996</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * Silicon Graphics Computer Systems, Inc.</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> *</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * Permission to use, copy, modify, distribute and sell this software</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> * and its documentation for any purpose is hereby granted without fee,</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * provided that the above copyright notice appear in all copies and</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> * that both that copyright notice and this permission notice appear</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> * in supporting documentation. Silicon Graphics makes no</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> * representations about the suitability of this software for any</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> * purpose. It is provided "as is" without express or implied warranty.</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> */</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"></span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment">/** @file ext/functional</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> * This file is a GNU extension to the Standard C++ Library (possibly</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> * containing extensions from the HP/SGI STL subset).</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"> */</span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor">#ifndef _EXT_FUNCTIONAL</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor">#define _EXT_FUNCTIONAL 1</span></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> <span class="preprocessor">#pragma GCC system_header</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor">#include <<a class="code" href="a16818.html">functional</a>></span></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> <span class="keyword">namespace </span><a class="code" href="a01544.html">__gnu_cxx</a> _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>  <span class="keyword">using</span> std::size_t;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keyword">using</span> <a class="code" href="a07308.html">std::unary_function</a>;</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keyword">using</span> <a class="code" href="a07312.html">std::binary_function</a>;</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keyword">using</span> <a class="code" href="a07596.html">std::mem_fun1_t</a>;</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keyword">using</span> <a class="code" href="a07600.html">std::const_mem_fun1_t</a>;</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keyword">using</span> <a class="code" href="a07604.html">std::mem_fun1_ref_t</a>;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keyword">using</span> <a class="code" href="a07608.html">std::const_mem_fun1_ref_t</a>;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"></span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> /** The @c identity_element functions are not part of the C++</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> * standard; SGI provided them as an extension. Its argument is an</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> * operation, and its return value is the identity element for that</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> * operation. It is overloaded for addition and multiplication,</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> * and you can overload it for your own nefarious operations.</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> *</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> * @addtogroup SGIextensions</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> * @{</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> */</span><span class="comment"></span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Tp></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keyword">inline</span> _Tp</div><div class="line"><a name="l00087"></a><span class="lineno"><a class="line" href="a01459.html#gace93b3939a95d95c7f1b010457a54ff9"> 87</a></span>  identity_element(<a class="code" href="a07316.html">std::plus<_Tp></a>)</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  { <span class="keywordflow">return</span> _Tp(0); }</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"></span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Tp></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keyword">inline</span> _Tp</div><div class="line"><a name="l00093"></a><span class="lineno"><a class="line" href="a01459.html#gaadbb1d3b3633bdf49a06904e95d5ef79"> 93</a></span>  identity_element(<a class="code" href="a07324.html">std::multiplies<_Tp></a>)</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  { <span class="keywordflow">return</span> _Tp(1); }<span class="comment"></span></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"> /** @} */</span></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment"></span></div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> /** As an extension to the binders, SGI provided composition functors and</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"> * wrapper functions to aid in their creation. The @c unary_compose</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> * functor is constructed from two functions/functors, @c f and @c g.</span></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> * Calling @c operator() with a single argument @c x returns @c f(g(x)).</span></div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> * The function @c compose1 takes the two functions and constructs a</span></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> * @c unary_compose variable for you.</span></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> *</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> * @c binary_compose is constructed from three functors, @c f, @c g1,</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> * and @c g2. Its @c operator() returns @c f(g1(x),g2(x)). The function</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> * compose2 takes f, g1, and g2, and constructs the @c binary_compose</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment"> * instance for you. For example, if @c f returns an int, then</span></div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> * \code</span></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"> * int answer = (compose2(f,g1,g2))(x);</span></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment"> * \endcode</span></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"> * is equivalent to</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment"> * \code</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment"> * int temp1 = g1(x);</span></div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"> * int temp2 = g2(x);</span></div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> * int answer = f(temp1,temp2);</span></div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> * \endcode</span></div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> * But the first form is more compact, and can be passed around as a</span></div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> * functor to other algorithms.</span></div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> *</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"> * @addtogroup SGIextensions</span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> * @{</span></div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"> */</span><span class="comment"></span></div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Operation1, <span class="keyword">class</span> _Operation2></div><div class="line"><a name="l00125"></a><span class="lineno"><a class="line" href="a09092.html"> 125</a></span>  <span class="keyword">class </span><a class="code" href="a09092.html">unary_compose</a></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  : <span class="keyword">public</span> <a class="code" href="a07308.html">unary_function</a><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>  <span class="keyword">protected</span>:</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>  <span class="keyword">public</span>:</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <a class="code" href="a09092.html">unary_compose</a>(<span class="keyword">const</span> _Operation1& __x, <span class="keyword">const</span> _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>  <span class="keyword">typename</span> _Operation1::result_type</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  operator()(<span class="keyword">const</span> <span class="keyword">typename</span> _Operation2::argument_type& __x)<span class="keyword"> const</span></div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="keyword"> </span>{ <span class="keywordflow">return</span> _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> <span class="comment"></span></div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Operation1, <span class="keyword">class</span> _Operation2></div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keyword">inline</span> <a class="code" href="a09092.html">unary_compose<_Operation1, _Operation2></a></div><div class="line"><a name="l00145"></a><span class="lineno"><a class="line" href="a01459.html#ga0099fa0a5f616d3bc2ba21b81902fc5f"> 145</a></span>  <a class="code" href="a01459.html#ga0099fa0a5f616d3bc2ba21b81902fc5f">compose1</a>(<span class="keyword">const</span> _Operation1& __fn1, <span class="keyword">const</span> _Operation2& __fn2)</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  { <span class="keywordflow">return</span> <a class="code" href="a09092.html">unary_compose<_Operation1,_Operation2></a>(__fn1, __fn2); }</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment"></span></div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Operation1, <span class="keyword">class</span> _Operation2, <span class="keyword">class</span> _Operation3></div><div class="line"><a name="l00150"></a><span class="lineno"><a class="line" href="a09096.html"> 150</a></span>  <span class="keyword">class </span><a class="code" href="a09096.html">binary_compose</a></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  : <span class="keyword">public</span> <a class="code" href="a07308.html">unary_function</a><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>  <span class="keyword">protected</span>:</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>  <span class="keyword">public</span>:</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <a class="code" href="a09096.html">binary_compose</a>(<span class="keyword">const</span> _Operation1& __x, <span class="keyword">const</span> _Operation2& __y,</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keyword">const</span> _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>  <span class="keyword">typename</span> _Operation1::result_type</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  operator()(<span class="keyword">const</span> <span class="keyword">typename</span> _Operation2::argument_type& __x)<span class="keyword"> const</span></div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="keyword"> </span>{ <span class="keywordflow">return</span> _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> <span class="comment"></span></div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Operation1, <span class="keyword">class</span> _Operation2, <span class="keyword">class</span> _Operation3></div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keyword">inline</span> <a class="code" href="a09096.html">binary_compose<_Operation1, _Operation2, _Operation3></a></div><div class="line"><a name="l00172"></a><span class="lineno"><a class="line" href="a01459.html#ga3a4bcb8b957d6c73414c6a5eda0fef17"> 172</a></span>  <a class="code" href="a01459.html#ga3a4bcb8b957d6c73414c6a5eda0fef17">compose2</a>(<span class="keyword">const</span> _Operation1& __fn1, <span class="keyword">const</span> _Operation2& __fn2,</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keyword">const</span> _Operation3& __fn3)</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  { <span class="keywordflow">return</span> <a class="code" href="a09096.html">binary_compose<_Operation1, _Operation2, _Operation3></a></div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  (__fn1, __fn2, __fn3); }<span class="comment"></span></div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="comment"> /** @} */</span></div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment"></span></div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment"> /** As an extension, SGI provided a functor called @c identity. When a</span></div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="comment"> * functor is required but no operations are desired, this can be used as a</span></div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="comment"> * pass-through. Its @c operator() returns its argument unchanged.</span></div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="comment"> *</span></div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="comment"> * @addtogroup SGIextensions</span></div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span> <span class="comment"> */</span></div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="keyword">template</span> <<span class="keyword">class</span> _Tp></div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="keyword">struct </span>identity</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  : <span class="keyword">public</span> std::_Identity<_Tp> {};</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="comment"></span></div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="comment"> /** @c select1st and @c select2nd are extensions provided by SGI. Their</span></div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="comment"> * @c operator()s</span></div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="comment"> * take a @c std::pair as an argument, and return either the first member</span></div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="comment"> * or the second member, respectively. They can be used (especially with</span></div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="comment"> * the composition functors) to @a strip data from a sequence before</span></div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span> <span class="comment"> * performing the remainder of an algorithm.</span></div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span> <span class="comment"> *</span></div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="comment"> * @addtogroup SGIextensions</span></div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="comment"> * @{</span></div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="comment"> */</span><span class="comment"></span></div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Pair></div><div class="line"><a name="l00200"></a><span class="lineno"><a class="line" href="a09104.html"> 200</a></span>  <span class="keyword">struct </span><a class="code" href="a09104.html">select1st</a></div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  : <span class="keyword">public</span> std::_Select1st<_Pair> {};</div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="comment"></span></div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Pair></div><div class="line"><a name="l00205"></a><span class="lineno"><a class="line" href="a09108.html"> 205</a></span>  <span class="keyword">struct </span><a class="code" href="a09108.html">select2nd</a></div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  : <span class="keyword">public</span> std::_Select2nd<_Pair> {};</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="comment"></span></div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <span class="comment"> /** @} */</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>  <span class="comment">// extension documented next</span></div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="keyword">template</span> <<span class="keyword">class</span> _Arg1, <span class="keyword">class</span> _Arg2></div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keyword">struct </span>_Project1st : <span class="keyword">public</span> <a class="code" href="a07312.html">binary_function</a><_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()(<span class="keyword">const</span> _Arg1& __x, <span class="keyword">const</span> _Arg2&)<span class="keyword"> const</span></div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="keyword"> </span>{ <span class="keywordflow">return</span> __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>  <span class="keyword">template</span> <<span class="keyword">class</span> _Arg1, <span class="keyword">class</span> _Arg2></div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keyword">struct </span>_Project2nd : <span class="keyword">public</span> 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()(<span class="keyword">const</span> _Arg1&, <span class="keyword">const</span> _Arg2& __y)<span class="keyword"> const</span></div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="keyword"> </span>{ <span class="keywordflow">return</span> __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> <span class="comment"></span></div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="comment"> /** The @c operator() of the @c project1st functor takes two arbitrary</span></div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span> <span class="comment"> * arguments and returns the first one, while @c project2nd returns the</span></div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="comment"> * second one. They are extensions provided by SGI.</span></div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="comment"> *</span></div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="comment"> * @addtogroup SGIextensions</span></div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="comment"> * @{</span></div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span> <span class="comment"> */</span></div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="comment"></span></div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Arg1, <span class="keyword">class</span> _Arg2></div><div class="line"><a name="l00237"></a><span class="lineno"><a class="line" href="a09120.html"> 237</a></span>  <span class="keyword">struct </span><a class="code" href="a09120.html">project1st</a> : <span class="keyword">public</span> _Project1st<_Arg1, _Arg2> {};</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span> <span class="comment"></span></div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Arg1, <span class="keyword">class</span> _Arg2></div><div class="line"><a name="l00241"></a><span class="lineno"><a class="line" href="a09124.html"> 241</a></span>  <span class="keyword">struct </span><a class="code" href="a09124.html">project2nd</a> : <span class="keyword">public</span> _Project2nd<_Arg1, _Arg2> {};<span class="comment"></span></div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="comment"> /** @} */</span></div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span> </div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="comment">// extension documented next</span></div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keyword">template</span> <<span class="keyword">class</span> _Result></div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keyword">struct </span>_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>  <span class="keyword">typedef</span> _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(<span class="keyword">const</span> 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>  <span class="keyword">const</span> result_type&</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  operator()()<span class="keyword"> const</span></div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span> <span class="keyword"> </span>{ <span class="keywordflow">return</span> _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>  <span class="keyword">template</span> <<span class="keyword">class</span> _Result, <span class="keyword">class</span> _Argument></div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keyword">struct </span>_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>  <span class="keyword">typedef</span> _Argument argument_type;</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keyword">typedef</span> _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(<span class="keyword">const</span> 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>  <span class="keyword">const</span> result_type&</div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  operator()(<span class="keyword">const</span> _Argument&)<span class="keyword"> const</span></div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span> <span class="keyword"> </span>{ <span class="keywordflow">return</span> _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>  <span class="keyword">template</span> <<span class="keyword">class</span> _Result, <span class="keyword">class</span> _Arg1, <span class="keyword">class</span> _Arg2></div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keyword">struct </span>_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>  <span class="keyword">typedef</span> _Arg1 first_argument_type;</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keyword">typedef</span> _Arg2 second_argument_type;</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="keyword">typedef</span> _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(<span class="keyword">const</span> _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>  <span class="keyword">const</span> result_type&</div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  operator()(<span class="keyword">const</span> _Arg1&, <span class="keyword">const</span> _Arg2&)<span class="keyword"> const</span></div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span> <span class="keyword"> </span>{ <span class="keywordflow">return</span> _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> <span class="comment"></span></div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span> <span class="comment"> /** These three functors are each constructed from a single arbitrary</span></div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span> <span class="comment"> * variable/value. Later, their @c operator()s completely ignore any</span></div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span> <span class="comment"> * arguments passed, and return the stored value.</span></div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span> <span class="comment"> * - @c constant_void_fun's @c operator() takes no arguments</span></div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span> <span class="comment"> * - @c constant_unary_fun's @c operator() takes one argument (ignored)</span></div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span> <span class="comment"> * - @c constant_binary_fun's @c operator() takes two arguments (ignored)</span></div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span> <span class="comment"> *</span></div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span> <span class="comment"> * The helper creator functions @c constant0, @c constant1, and</span></div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span> <span class="comment"> * @c constant2 each take a @a result argument and construct variables of</span></div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span> <span class="comment"> * the appropriate functor type.</span></div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span> <span class="comment"> *</span></div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span> <span class="comment"> * @addtogroup SGIextensions</span></div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span> <span class="comment"> * @{</span></div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span> <span class="comment"> */</span><span class="comment"></span></div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Result></div><div class="line"><a name="l00303"></a><span class="lineno"><a class="line" href="a09140.html"> 303</a></span>  <span class="keyword">struct </span><a class="code" href="a09140.html">constant_void_fun</a></div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  : <span class="keyword">public</span> _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>  <a class="code" href="a09140.html">constant_void_fun</a>(<span class="keyword">const</span> _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> <span class="comment"></span></div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Result, <span class="keyword">class</span> _Argument = _Result></div><div class="line"><a name="l00312"></a><span class="lineno"><a class="line" href="a09144.html"> 312</a></span>  <span class="keyword">struct </span><a class="code" href="a09144.html">constant_unary_fun</a> : <span class="keyword">public</span> _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>  <a class="code" href="a09144.html">constant_unary_fun</a>(<span class="keyword">const</span> _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> <span class="comment"></span></div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Result, <span class="keyword">class</span> _Arg1 = _Result, <span class="keyword">class</span> _Arg2 = _Arg1></div><div class="line"><a name="l00320"></a><span class="lineno"><a class="line" href="a09148.html"> 320</a></span>  <span class="keyword">struct </span><a class="code" href="a09148.html">constant_binary_fun</a></div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  : <span class="keyword">public</span> _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>  <a class="code" href="a09148.html">constant_binary_fun</a>(<span class="keyword">const</span> _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> <span class="comment"></span></div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Result></div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  <span class="keyword">inline</span> <a class="code" href="a09140.html">constant_void_fun<_Result></a></div><div class="line"><a name="l00330"></a><span class="lineno"><a class="line" href="a01459.html#gabbe0a1fe70c819c69c49791fd172bbb7"> 330</a></span>  <a class="code" href="a01459.html#gabbe0a1fe70c819c69c49791fd172bbb7">constant0</a>(<span class="keyword">const</span> _Result& __val)</div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  { <span class="keywordflow">return</span> <a class="code" href="a09140.html">constant_void_fun<_Result></a>(__val); }</div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span> <span class="comment"></span></div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Result></div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  <span class="keyword">inline</span> constant_unary_fun<_Result, _Result></div><div class="line"><a name="l00336"></a><span class="lineno"><a class="line" href="a01459.html#ga00aba91be56a04a7a200f932b507c4f2"> 336</a></span>  <a class="code" href="a01459.html#ga00aba91be56a04a7a200f932b507c4f2">constant1</a>(<span class="keyword">const</span> _Result& __val)</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  { <span class="keywordflow">return</span> <a class="code" href="a09144.html">constant_unary_fun<_Result, _Result></a>(__val); }</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span> <span class="comment"></span></div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span> <span class="comment"> /// An \link SGIextensions SGI extension \endlink.</span></div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> _Result></div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  <span class="keyword">inline</span> constant_binary_fun<_Result,_Result,_Result></div><div class="line"><a name="l00342"></a><span class="lineno"><a class="line" href="a01459.html#gafa3404bd6e935274a6ce879dab3c8d08"> 342</a></span>  <a class="code" href="a01459.html#gafa3404bd6e935274a6ce879dab3c8d08">constant2</a>(<span class="keyword">const</span> _Result& __val)</div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  { <span class="keywordflow">return</span> <a class="code" href="a09148.html">constant_binary_fun<_Result, _Result, _Result></a>(__val); }<span class="comment"></span></div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span> <span class="comment"> /** @} */</span></div><div class="line"><a name="l00345"></a><span class="lineno"> 345</span> <span class="comment"></span></div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span> <span class="comment"> /** The @c subtractive_rng class is documented on</span></div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span> <span class="comment"> * <a href="http://www.sgi.com/tech/stl/">SGI's site</a>.</span></div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span> <span class="comment"> * Note that this code assumes that @c int is 32 bits.</span></div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span> <span class="comment"> *</span></div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span> <span class="comment"> * @ingroup SGIextensions</span></div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span> <span class="comment"> */</span></div><div class="line"><a name="l00352"></a><span class="lineno"><a class="line" href="a09152.html"> 352</a></span>  <span class="keyword">class </span><a class="code" href="a09152.html">subtractive_rng</a></div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  : <span class="keyword">public</span> <a class="code" href="a07308.html">unary_function</a><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>  <span class="keyword">private</span>:</div><div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> _M_table[55];</div><div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keywordtype">size_t</span> _M_index1;</div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  <span class="keywordtype">size_t</span> _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>  <span class="keyword">public</span>:<span class="comment"></span></div><div class="line"><a name="l00361"></a><span class="lineno"> 361</span> <span class="comment"> /// Returns a number less than the argument.</span></div><div class="line"><a name="l00362"></a><span class="lineno"> 362</span> <span class="comment"></span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span></div><div class="line"><a name="l00363"></a><span class="lineno"><a class="line" href="a09152.html#a01fb6415bad2c6df91eb607f863fd9e5"> 363</a></span>  <a class="code" href="a09152.html#a01fb6415bad2c6df91eb607f863fd9e5">operator()</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> __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>  <span class="keywordflow">return</span> _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>  <span class="keywordtype">void</span></div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  _M_initialize(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> __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>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> __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>  <span class="keywordtype">size_t</span> __i;</div><div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  <span class="keywordflow">for</span> (__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>  <span class="keywordtype">size_t</span> __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>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> __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>  <span class="keywordflow">for</span> (__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> <span class="comment"></span></div><div class="line"><a name="l00393"></a><span class="lineno"> 393</span> <span class="comment"> /// Ctor allowing you to initialize the seed.</span></div><div class="line"><a name="l00394"></a><span class="lineno"><a class="line" href="a09152.html#a4e0180804e5e548805eca04c560571d5"> 394</a></span> <span class="comment"></span> <a class="code" href="a09152.html#a4e0180804e5e548805eca04c560571d5">subtractive_rng</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> __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> <span class="comment"></span></div><div class="line"><a name="l00397"></a><span class="lineno"> 397</span> <span class="comment"> /// Default ctor; initializes its state with some number you don't see.</span></div><div class="line"><a name="l00398"></a><span class="lineno"><a class="line" href="a09152.html#a8763d20bcd47a2f9acd2da92e39193a8"> 398</a></span> <span class="comment"></span> <a class="code" href="a09152.html#a8763d20bcd47a2f9acd2da92e39193a8">subtractive_rng</a>()</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>  <span class="comment">// Mem_fun adaptor helper functions mem_fun1 and mem_fun1_ref,</span></div><div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  <span class="comment">// provided for backward compatibility, they are no longer part of</span></div><div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  <span class="comment">// the C++ standard.</span></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>  <span class="keyword">template</span> <<span class="keyword">class</span> _Ret, <span class="keyword">class</span> _Tp, <span class="keyword">class</span> _Arg></div><div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  <span class="keyword">inline</span> 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>  { <span class="keywordflow">return</span> 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>  <span class="keyword">template</span> <<span class="keyword">class</span> _Ret, <span class="keyword">class</span> _Tp, <span class="keyword">class</span> _Arg></div><div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  <span class="keyword">inline</span> 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) <span class="keyword">const</span>)</div><div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  { <span class="keywordflow">return</span> 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>  <span class="keyword">template</span> <<span class="keyword">class</span> _Ret, <span class="keyword">class</span> _Tp, <span class="keyword">class</span> _Arg></div><div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  <span class="keyword">inline</span> 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>  { <span class="keywordflow">return</span> 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>  <span class="keyword">template</span> <<span class="keyword">class</span> _Ret, <span class="keyword">class</span> _Tp, <span class="keyword">class</span> _Arg></div><div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  <span class="keyword">inline</span> 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) <span class="keyword">const</span>)</div><div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  { <span class="keywordflow">return</span> 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> } <span class="comment">// namespace</span></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> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00430"></a><span class="lineno"> 430</span> </div><div class="ttc" id="a09144_html"><div class="ttname"><a href="a09144.html">__gnu_cxx::constant_unary_fun</a></div><div class="ttdoc">An SGI extension .</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00312">ext/functional:312</a></div></div>
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<div class="ttc" id="a07596_html"><div class="ttname"><a href="a07596.html">std::mem_fun1_t</a></div><div class="ttdoc">One of the adaptors for member pointers.</div><div class="ttdef"><b>Definition:</b> <a href="a00542_source.html#l01251">stl_function.h:1251</a></div></div>
<div class="ttc" id="a09096_html"><div class="ttname"><a href="a09096.html">__gnu_cxx::binary_compose</a></div><div class="ttdoc">An SGI extension .</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00150">ext/functional:150</a></div></div>
<div class="ttc" id="a01544_html"><div class="ttname"><a href="a01544.html">__gnu_cxx</a></div><div class="ttdoc">GNU extensions for public use.</div></div>
<div class="ttc" id="a07312_html"><div class="ttname"><a href="a07312.html">std::binary_function</a></div><div class="ttdef"><b>Definition:</b> <a href="a00542_source.html#l00118">stl_function.h:118</a></div></div>
<div class="ttc" id="a09152_html_a4e0180804e5e548805eca04c560571d5"><div class="ttname"><a href="a09152.html#a4e0180804e5e548805eca04c560571d5">__gnu_cxx::subtractive_rng::subtractive_rng</a></div><div class="ttdeci">subtractive_rng(unsigned int __seed)</div><div class="ttdoc">Ctor allowing you to initialize the seed.</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00394">ext/functional:394</a></div></div>
<div class="ttc" id="a07600_html"><div class="ttname"><a href="a07600.html">std::const_mem_fun1_t</a></div><div class="ttdoc">One of the adaptors for member pointers.</div><div class="ttdef"><b>Definition:</b> <a href="a00542_source.html#l01269">stl_function.h:1269</a></div></div>
<div class="ttc" id="a01459_html_gafa3404bd6e935274a6ce879dab3c8d08"><div class="ttname"><a href="a01459.html#gafa3404bd6e935274a6ce879dab3c8d08">__gnu_cxx::constant2</a></div><div class="ttdeci">constant_binary_fun< _Result, _Result, _Result > constant2(const _Result &__val)</div><div class="ttdoc">An SGI extension .</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00342">ext/functional:342</a></div></div>
<div class="ttc" id="a09152_html_a8763d20bcd47a2f9acd2da92e39193a8"><div class="ttname"><a href="a09152.html#a8763d20bcd47a2f9acd2da92e39193a8">__gnu_cxx::subtractive_rng::subtractive_rng</a></div><div class="ttdeci">subtractive_rng()</div><div class="ttdoc">Default ctor; initializes its state with some number you don't see.</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00398">ext/functional:398</a></div></div>
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<div class="ttc" id="a09120_html"><div class="ttname"><a href="a09120.html">__gnu_cxx::project1st</a></div><div class="ttdoc">An SGI extension .</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00237">ext/functional:237</a></div></div>
<div class="ttc" id="a07308_html"><div class="ttname"><a href="a07308.html">std::unary_function</a></div><div class="ttdef"><b>Definition:</b> <a href="a00542_source.html#l00105">stl_function.h:105</a></div></div>
<div class="ttc" id="a07608_html"><div class="ttname"><a href="a07608.html">std::const_mem_fun1_ref_t</a></div><div class="ttdoc">One of the adaptors for member pointers.</div><div class="ttdef"><b>Definition:</b> <a href="a00542_source.html#l01305">stl_function.h:1305</a></div></div>
<div class="ttc" id="a09152_html"><div class="ttname"><a href="a09152.html">__gnu_cxx::subtractive_rng</a></div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00352">ext/functional:352</a></div></div>
<div class="ttc" id="a01459_html_ga0099fa0a5f616d3bc2ba21b81902fc5f"><div class="ttname"><a href="a01459.html#ga0099fa0a5f616d3bc2ba21b81902fc5f">__gnu_cxx::compose1</a></div><div class="ttdeci">unary_compose< _Operation1, _Operation2 > compose1(const _Operation1 &__fn1, const _Operation2 &__fn2)</div><div class="ttdoc">An SGI extension .</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00145">ext/functional:145</a></div></div>
<div class="ttc" id="a09140_html"><div class="ttname"><a href="a09140.html">__gnu_cxx::constant_void_fun</a></div><div class="ttdoc">An SGI extension .</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00303">ext/functional:303</a></div></div>
<div class="ttc" id="a07316_html"><div class="ttname"><a href="a07316.html">std::plus</a></div><div class="ttdoc">One of the math functors.</div><div class="ttdef"><b>Definition:</b> <a href="a00542_source.html#l00147">stl_function.h:147</a></div></div>
<div class="ttc" id="a07604_html"><div class="ttname"><a href="a07604.html">std::mem_fun1_ref_t</a></div><div class="ttdoc">One of the adaptors for member pointers.</div><div class="ttdef"><b>Definition:</b> <a href="a00542_source.html#l01287">stl_function.h:1287</a></div></div>
<div class="ttc" id="a09108_html"><div class="ttname"><a href="a09108.html">__gnu_cxx::select2nd</a></div><div class="ttdoc">An SGI extension .</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00205">ext/functional:205</a></div></div>
<div class="ttc" id="a16818_html"><div class="ttname"><a href="a16818.html">functional</a></div></div>
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<div class="ttc" id="a09092_html"><div class="ttname"><a href="a09092.html">__gnu_cxx::unary_compose</a></div><div class="ttdoc">An SGI extension .</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00125">ext/functional:125</a></div></div>
<div class="ttc" id="a09104_html"><div class="ttname"><a href="a09104.html">__gnu_cxx::select1st</a></div><div class="ttdoc">An SGI extension .</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00200">ext/functional:200</a></div></div>
<div class="ttc" id="a09152_html_a01fb6415bad2c6df91eb607f863fd9e5"><div class="ttname"><a href="a09152.html#a01fb6415bad2c6df91eb607f863fd9e5">__gnu_cxx::subtractive_rng::operator()</a></div><div class="ttdeci">unsigned int operator()(unsigned int __limit)</div><div class="ttdoc">Returns a number less than the argument.</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00363">ext/functional:363</a></div></div>
<div class="ttc" id="a09148_html"><div class="ttname"><a href="a09148.html">__gnu_cxx::constant_binary_fun</a></div><div class="ttdoc">An SGI extension .</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00320">ext/functional:320</a></div></div>
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<div class="ttc" id="a01459_html_ga3a4bcb8b957d6c73414c6a5eda0fef17"><div class="ttname"><a href="a01459.html#ga3a4bcb8b957d6c73414c6a5eda0fef17">__gnu_cxx::compose2</a></div><div class="ttdeci">binary_compose< _Operation1, _Operation2, _Operation3 > compose2(const _Operation1 &__fn1, const _Operation2 &__fn2, const _Operation3 &__fn3)</div><div class="ttdoc">An SGI extension .</div><div class="ttdef"><b>Definition:</b> <a href="a16818_source.html#l00172">ext/functional:172</a></div></div>
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