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<a href="a00950.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">// -*- 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) 2007-2018 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 terms</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// of the GNU General Public License as published by the Free Software</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Foundation; either version 3, or (at your option) any later</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// 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, but</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// 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 GNU</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// 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> <span class="comment"></span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">/** @file parallel/random_number.h</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * @brief Random number generator based on the Mersenne twister.</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * This file is a GNU parallel extension to the Standard C++ Library.</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> */</span></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> <span class="comment">// Written by Johannes Singler.</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#ifndef _GLIBCXX_PARALLEL_RANDOM_NUMBER_H</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#define _GLIBCXX_PARALLEL_RANDOM_NUMBER_H 1</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#include <<a class="code" href="a00971.html">parallel/types.h</a>></span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#include <tr1/random></span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#include <<a class="code" href="a00095.html">limits</a>></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> <span class="keyword">namespace </span><a class="code" href="a01575.html">__gnu_parallel</a></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> {<span class="comment"></span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> /** @brief Random number generator, based on the Mersenne twister. */</span></div><div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="a09607.html"> 42</a></span>  <span class="keyword">class </span><a class="code" href="a09607.html">_RandomNumber</a></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  {</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <a class="code" href="a01534.html#ga887bdc65ea12ca4f83aa79f5bd9fce03">std::tr1::mt19937</a> _M_mt;</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  uint64_t _M_supremum;</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  uint64_t _M_rand_sup;</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordtype">double</span> _M_supremum_reciprocal;</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordtype">double</span> _M_rand_sup_reciprocal;</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>  <span class="comment">// Assumed to be twice as long as the usual random number.</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  uint64_t __cache;</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="comment">// Bit results.</span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordtype">int</span> __bits_left;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  </div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keyword">static</span> uint32_t</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  __scale_down(uint64_t __x,</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> #<span class="keywordflow">if</span> <a class="code" href="a00881.html#a680d9fc5fc8574e507cbe9340f688173">_GLIBCXX_SCALE_DOWN_FPU</a></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  uint64_t <span class="comment">/*_M_supremum*/</span>, <span class="keywordtype">double</span> _M_supremum_reciprocal)</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  uint64_t _M_supremum, <span class="keywordtype">double</span> <span class="comment">/*_M_supremum_reciprocal*/</span>)</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> #endif</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> <span class="preprocessor">#if _GLIBCXX_SCALE_DOWN_FPU</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordflow">return</span> uint32_t(__x * _M_supremum_reciprocal);</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">return</span> static_cast<uint32_t>(__x % _M_supremum);</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  }</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keyword">public</span>:<span class="comment"></span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> /** @brief Default constructor. Seed with 0. */</span></div><div class="line"><a name="l00074"></a><span class="lineno"><a class="line" href="a09607.html#acdf323e8c00b83892d86bf932bf3a966"> 74</a></span>  <a class="code" href="a09607.html#acdf323e8c00b83892d86bf932bf3a966">_RandomNumber</a>()</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  : _M_mt(0), _M_supremum(0x100000000ULL),</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  _M_rand_sup(1ULL << <a class="code" href="a01541.html">std</a>::numeric_limits<uint32_t>::digits),</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  _M_supremum_reciprocal(double(_M_supremum) / double(_M_rand_sup)),</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  _M_rand_sup_reciprocal(1.0 / double(_M_rand_sup)),</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  __cache(0), __bits_left(0) { }</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"> /** @brief Constructor.</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> * @param __seed Random __seed.</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> * @param _M_supremum Generate integer random numbers in the</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> * interval @c [0,_M_supremum). */</span></div><div class="line"><a name="l00085"></a><span class="lineno"><a class="line" href="a09607.html#ae80e68e8fce17ae590fd4ca1b5ea40d4"> 85</a></span>  <a class="code" href="a09607.html#ae80e68e8fce17ae590fd4ca1b5ea40d4">_RandomNumber</a>(uint32_t __seed, uint64_t _M_supremum = 0x100000000ULL)</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  : _M_mt(__seed), _M_supremum(_M_supremum),</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  _M_rand_sup(1ULL << <a class="code" href="a01541.html">std</a>::numeric_limits<uint32_t>::digits),</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  _M_supremum_reciprocal(double(_M_supremum) / double(_M_rand_sup)),</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  _M_rand_sup_reciprocal(1.0 / double(_M_rand_sup)),</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  __cache(0), __bits_left(0) { }</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"></span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"> /** @brief Generate unsigned random 32-bit integer. */</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  uint32_t</div><div class="line"><a name="l00094"></a><span class="lineno"><a class="line" href="a09607.html#ac0da7b514eddc08518d496c93015bb39"> 94</a></span>  <a class="code" href="a09607.html#ac0da7b514eddc08518d496c93015bb39">operator()</a>()</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  { <span class="keywordflow">return</span> __scale_down(_M_mt(), _M_supremum, _M_supremum_reciprocal); }</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"> /** @brief Generate unsigned random 32-bit integer in the</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"> interval @c [0,local_supremum). */</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  uint32_t</div><div class="line"><a name="l00100"></a><span class="lineno"><a class="line" href="a09607.html#a58e1450c9d06b629dde759438bc7d83c"> 100</a></span>  <a class="code" href="a09607.html#a58e1450c9d06b629dde759438bc7d83c">operator()</a>(uint64_t local_supremum)</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  {</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> __scale_down(_M_mt(), local_supremum,</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordtype">double</span>(local_supremum * _M_rand_sup_reciprocal));</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  }</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"></span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> /** @brief Generate a number of random bits, run-time parameter.</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment"> * @param __bits Number of bits to generate. */</span></div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span></div><div class="line"><a name="l00109"></a><span class="lineno"><a class="line" href="a09607.html#a4fd974d8ce4f13ea3c1aad5cb999c55b"> 109</a></span>  <a class="code" href="a09607.html#a4fd974d8ce4f13ea3c1aad5cb999c55b">__genrand_bits</a>(<span class="keywordtype">int</span> __bits)</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  {</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> __res = __cache & ((1 << __bits) - 1);</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  __cache = __cache >> __bits;</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  __bits_left -= __bits;</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">if</span> (__bits_left < 32)</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  {</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  __cache |= ((uint64_t(_M_mt())) << __bits_left);</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  __bits_left += 32;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  }</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">return</span> __res;</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  }</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> } <span class="comment">// namespace __gnu_parallel</span></div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="preprocessor">#endif </span><span class="comment">/* _GLIBCXX_PARALLEL_RANDOM_NUMBER_H */</span><span class="preprocessor"></span></div><div class="ttc" id="a00971_html"><div class="ttname"><a href="a00971.html">types.h</a></div><div class="ttdoc">Basic types and typedefs. This file is a GNU parallel extension to the Standard C++ Library.</div></div>
<div class="ttc" id="a00881_html_a680d9fc5fc8574e507cbe9340f688173"><div class="ttname"><a href="a00881.html#a680d9fc5fc8574e507cbe9340f688173">_GLIBCXX_SCALE_DOWN_FPU</a></div><div class="ttdeci">#define _GLIBCXX_SCALE_DOWN_FPU</div><div class="ttdoc">Use floating-point scaling instead of modulo for mapping random numbers to a range....</div><div class="ttdef"><b>Definition:</b> <a href="a00881_source.html#l00055">compiletime_settings.h:55</a></div></div>
<div class="ttc" id="a09607_html_ae80e68e8fce17ae590fd4ca1b5ea40d4"><div class="ttname"><a href="a09607.html#ae80e68e8fce17ae590fd4ca1b5ea40d4">__gnu_parallel::_RandomNumber::_RandomNumber</a></div><div class="ttdeci">_RandomNumber(uint32_t __seed, uint64_t _M_supremum=0x100000000ULL)</div><div class="ttdoc">Constructor.</div><div class="ttdef"><b>Definition:</b> <a href="a00950_source.html#l00085">random_number.h:85</a></div></div>
<div class="ttc" id="a01541_html"><div class="ttname"><a href="a01541.html">std</a></div><div class="ttdoc">ISO C++ entities toplevel namespace is std.</div></div>
<div class="ttc" id="a00095_html"><div class="ttname"><a href="a00095.html">limits</a></div></div>
<div class="ttc" id="a09607_html_a58e1450c9d06b629dde759438bc7d83c"><div class="ttname"><a href="a09607.html#a58e1450c9d06b629dde759438bc7d83c">__gnu_parallel::_RandomNumber::operator()</a></div><div class="ttdeci">uint32_t operator()(uint64_t local_supremum)</div><div class="ttdoc">Generate unsigned random 32-bit integer in the interval [0,local_supremum).</div><div class="ttdef"><b>Definition:</b> <a href="a00950_source.html#l00100">random_number.h:100</a></div></div>
<div class="ttc" id="a09607_html_acdf323e8c00b83892d86bf932bf3a966"><div class="ttname"><a href="a09607.html#acdf323e8c00b83892d86bf932bf3a966">__gnu_parallel::_RandomNumber::_RandomNumber</a></div><div class="ttdeci">_RandomNumber()</div><div class="ttdoc">Default constructor. Seed with 0.</div><div class="ttdef"><b>Definition:</b> <a href="a00950_source.html#l00074">random_number.h:74</a></div></div>
<div class="ttc" id="a01575_html"><div class="ttname"><a href="a01575.html">__gnu_parallel</a></div><div class="ttdoc">GNU parallel code for public use.</div><div class="ttdef"><b>Definition:</b> <a href="a00872_source.html#l00061">balanced_quicksort.h:61</a></div></div>
<div class="ttc" id="a09607_html_ac0da7b514eddc08518d496c93015bb39"><div class="ttname"><a href="a09607.html#ac0da7b514eddc08518d496c93015bb39">__gnu_parallel::_RandomNumber::operator()</a></div><div class="ttdeci">uint32_t operator()()</div><div class="ttdoc">Generate unsigned random 32-bit integer.</div><div class="ttdef"><b>Definition:</b> <a href="a00950_source.html#l00094">random_number.h:94</a></div></div>
<div class="ttc" id="a01534_html_ga887bdc65ea12ca4f83aa79f5bd9fce03"><div class="ttname"><a href="a01534.html#ga887bdc65ea12ca4f83aa79f5bd9fce03">std::mt19937</a></div><div class="ttdeci">mersenne_twister_engine< uint_fast32_t, 32, 624, 397, 31, 0x9908b0dfUL, 11, 0xffffffffUL, 7, 0x9d2c5680UL, 15, 0xefc60000UL, 18, 1812433253UL > mt19937</div><div class="ttdef"><b>Definition:</b> <a href="a00452_source.html#l01528">random.h:1528</a></div></div>
<div class="ttc" id="a09607_html"><div class="ttname"><a href="a09607.html">__gnu_parallel::_RandomNumber</a></div><div class="ttdoc">Random number generator, based on the Mersenne twister.</div><div class="ttdef"><b>Definition:</b> <a href="a00950_source.html#l00042">random_number.h:42</a></div></div>
<div class="ttc" id="a09607_html_a4fd974d8ce4f13ea3c1aad5cb999c55b"><div class="ttname"><a href="a09607.html#a4fd974d8ce4f13ea3c1aad5cb999c55b">__gnu_parallel::_RandomNumber::__genrand_bits</a></div><div class="ttdeci">unsigned long __genrand_bits(int __bits)</div><div class="ttdoc">Generate a number of random bits, run-time parameter.</div><div class="ttdef"><b>Definition:</b> <a href="a00950_source.html#l00109">random_number.h:109</a></div></div>
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