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<a href="Random_8h.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">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> This file is part of Leela Zero.</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> Copyright (C) 2017 Gian-Carlo Pascutto</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"> Leela Zero is free software: you can redistribute it and/or modify</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> it under the terms of the GNU General Public License as published by</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> the Free Software Foundation, either version 3 of the License, or</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> (at your option) any later version.</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"></span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> Leela Zero is distributed in the hope that it will be useful,</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> GNU General Public License for more details.</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"></span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> You should have received a copy of the GNU General Public License</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> along with Leela Zero. If not, see <http://www.gnu.org/licenses/>.</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">*/</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#ifndef RANDOM_H_INCLUDED</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#define RANDOM_H_INCLUDED</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include <cstdint></span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <limits></span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keyword">namespace </span><a class="code" href="namespaceUtils.html">Utils</a> {</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00040"></a><span class="lineno"><a class="line" href="classUtils_1_1Random.html"> 40</a></span>  <span class="keyword">class </span><a class="code" href="classUtils_1_1Random.html">Random</a> {</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <a class="code" href="classUtils_1_1Random.html#ab2e106214e6cc251cf130ce3b0d3f855">Random</a>() = <span class="keyword">delete</span>;</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> </div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <a class="code" href="classUtils_1_1Random.html#ab2e106214e6cc251cf130ce3b0d3f855">Random</a>(std::uint64_t seed = 0);</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordtype">void</span> <a class="code" href="classUtils_1_1Random.html#a8c7708e5134b2e1b96b99098e619f1b1">seedrandom</a>(std::uint64_t s);</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="comment">// Random numbers from [0, max - 1]</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keyword">template</span><<span class="keywordtype">int</span> MAX></div><div class="line"><a name="l00073"></a><span class="lineno"><a class="line" href="classUtils_1_1Random.html#a833d6c9fa0981359fdd7ff50b1ce5ca5"> 73</a></span>  std::uint32_t <a class="code" href="classUtils_1_1Random.html#a833d6c9fa0981359fdd7ff50b1ce5ca5">randfix</a>() {</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  static_assert(0 < MAX && MAX < std::numeric_limits<std::uint32_t>::max(),<span class="stringliteral">"randfix out of range"</span>);</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="comment">// Last bit isn't random, so don't use it in isolation. We specialize</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// this case.</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  static_assert(MAX != 2, <span class="stringliteral">"don't isolate the LSB with xoroshiro128+"</span>);</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">return</span> gen() % MAX;</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  }</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  std::uint64_t <a class="code" href="classUtils_1_1Random.html#a5b70b55074f85821f54fead169c4fad2">randuint64</a>();</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> </div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">// Random number from [0, max - 1]</span></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"></span> std::uint64_t <a class="code" href="classUtils_1_1Random.html#a5b70b55074f85821f54fead169c4fad2">randuint64</a>(<span class="keyword">const</span> std::uint64_t <a class="code" href="classUtils_1_1Random.html#aec7ce0b88412fd1d4ee9184c4905112a">max</a>);</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment">// return the thread local RNG</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"></span> <span class="keyword">static</span> <a class="code" href="classUtils_1_1Random.html">Random</a>& <a class="code" href="classUtils_1_1Random.html#a885267b8e35bfdd9d6342e5acb834a18">get_Rng</a>(<span class="keywordtype">void</span>);</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> </div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="comment">// UniformRandomBitGenerator interface</span></div><div class="line"><a name="l00108"></a><span class="lineno"><a class="line" href="classUtils_1_1Random.html#a81041c98f41a29ba6d28bf070d20217c"> 108</a></span>  <span class="keyword">using</span> <a class="code" href="classUtils_1_1Random.html#a81041c98f41a29ba6d28bf070d20217c">result_type</a> = std::uint64_t;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div><div class="line"><a name="l00116"></a><span class="lineno"><a class="line" href="classUtils_1_1Random.html#a0ebc60d9e2ee8f5908b16f3285db8800"> 116</a></span>  constexpr <span class="keyword">static</span> <a class="code" href="classUtils_1_1Random.html#a81041c98f41a29ba6d28bf070d20217c">result_type</a> <a class="code" href="classUtils_1_1Random.html#a0ebc60d9e2ee8f5908b16f3285db8800">min</a>() {</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordflow">return</span> std::numeric_limits<result_type>::min();</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> </div><div class="line"><a name="l00126"></a><span class="lineno"><a class="line" href="classUtils_1_1Random.html#aec7ce0b88412fd1d4ee9184c4905112a"> 126</a></span>  constexpr <span class="keyword">static</span> <a class="code" href="classUtils_1_1Random.html#a81041c98f41a29ba6d28bf070d20217c">result_type</a> <a class="code" href="classUtils_1_1Random.html#aec7ce0b88412fd1d4ee9184c4905112a">max</a>() {</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">return</span> std::numeric_limits<result_type>::max();</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> </div><div class="line"><a name="l00136"></a><span class="lineno"><a class="line" href="classUtils_1_1Random.html#aee6aa8e62561a37af49c8a75cf9faf81"> 136</a></span>  <a class="code" href="classUtils_1_1Random.html#a81041c98f41a29ba6d28bf070d20217c">result_type</a> <a class="code" href="classUtils_1_1Random.html#aee6aa8e62561a37af49c8a75cf9faf81">operator()</a>() {</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordflow">return</span> gen();</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  }</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> </div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  std::uint64_t gen(<span class="keywordtype">void</span>);</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> </div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  std::uint64_t m_s[2]; </div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  };</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span> </div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="comment">// Specialization for last bit: use sign test</span></div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keyword">template</span><></div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keyword">inline</span> std::uint32_t Random::randfix<2>() {</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keywordflow">return</span> (gen() > (std::numeric_limits<std::uint64_t>::max() / 2));</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  }</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span> }</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="preprocessor">#endif</span></div><div class="ttc" id="classUtils_1_1Random_html_a5b70b55074f85821f54fead169c4fad2"><div class="ttname"><a href="classUtils_1_1Random.html#a5b70b55074f85821f54fead169c4fad2">Utils::Random::randuint64</a></div><div class="ttdeci">std::uint64_t randuint64()</div><div class="ttdoc">Generate raw random number.</div><div class="ttdef"><b>Definition:</b> Random.cpp:64</div></div>
<div class="ttc" id="classUtils_1_1Random_html_a81041c98f41a29ba6d28bf070d20217c"><div class="ttname"><a href="classUtils_1_1Random.html#a81041c98f41a29ba6d28bf070d20217c">Utils::Random::result_type</a></div><div class="ttdeci">std::uint64_t result_type</div><div class="ttdef"><b>Definition:</b> Random.h:108</div></div>
<div class="ttc" id="classUtils_1_1Random_html_a885267b8e35bfdd9d6342e5acb834a18"><div class="ttname"><a href="classUtils_1_1Random.html#a885267b8e35bfdd9d6342e5acb834a18">Utils::Random::get_Rng</a></div><div class="ttdeci">static Random & get_Rng(void)</div><div class="ttdoc">Get a copy of the current thread.</div><div class="ttdef"><b>Definition:</b> Random.cpp:29</div></div>
<div class="ttc" id="classUtils_1_1Random_html"><div class="ttname"><a href="classUtils_1_1Random.html">Utils::Random</a></div><div class="ttdoc">RNG based on Xoroshiro128+.</div><div class="ttdef"><b>Definition:</b> Random.h:40</div></div>
<div class="ttc" id="classUtils_1_1Random_html_ab2e106214e6cc251cf130ce3b0d3f855"><div class="ttname"><a href="classUtils_1_1Random.html#ab2e106214e6cc251cf130ce3b0d3f855">Utils::Random::Random</a></div><div class="ttdeci">Random()=delete</div><div class="ttdoc">Free the pointed object.</div></div>
<div class="ttc" id="classUtils_1_1Random_html_aec7ce0b88412fd1d4ee9184c4905112a"><div class="ttname"><a href="classUtils_1_1Random.html#aec7ce0b88412fd1d4ee9184c4905112a">Utils::Random::max</a></div><div class="ttdeci">static constexpr result_type max()</div><div class="ttdoc">Max integer value, part of UniformRandomBitGenerator interface.</div><div class="ttdef"><b>Definition:</b> Random.h:126</div></div>
<div class="ttc" id="classUtils_1_1Random_html_a0ebc60d9e2ee8f5908b16f3285db8800"><div class="ttname"><a href="classUtils_1_1Random.html#a0ebc60d9e2ee8f5908b16f3285db8800">Utils::Random::min</a></div><div class="ttdeci">static constexpr result_type min()</div><div class="ttdoc">Min integer value, part of UniformRandomBitGenerator interface.</div><div class="ttdef"><b>Definition:</b> Random.h:116</div></div>
<div class="ttc" id="classUtils_1_1Random_html_a833d6c9fa0981359fdd7ff50b1ce5ca5"><div class="ttname"><a href="classUtils_1_1Random.html#a833d6c9fa0981359fdd7ff50b1ce5ca5">Utils::Random::randfix</a></div><div class="ttdeci">std::uint32_t randfix()</div><div class="ttdoc">Check that the random number will be generated in a correct range, then generate it.</div><div class="ttdef"><b>Definition:</b> Random.h:73</div></div>
<div class="ttc" id="classUtils_1_1Random_html_a8c7708e5134b2e1b96b99098e619f1b1"><div class="ttname"><a href="classUtils_1_1Random.html#a8c7708e5134b2e1b96b99098e619f1b1">Utils::Random::seedrandom</a></div><div class="ttdeci">void seedrandom(std::uint64_t s)</div><div class="ttdoc">Initialize state of xoroshiro128+ by transforming the seed with the splitmix64 algorithm.</div><div class="ttdef"><b>Definition:</b> Random.cpp:75</div></div>
<div class="ttc" id="classUtils_1_1Random_html_aee6aa8e62561a37af49c8a75cf9faf81"><div class="ttname"><a href="classUtils_1_1Random.html#aee6aa8e62561a37af49c8a75cf9faf81">Utils::Random::operator()</a></div><div class="ttdeci">result_type operator()()</div><div class="ttdoc">Generate a raw random number, part of UniformRandomBitGenerator interface.</div><div class="ttdef"><b>Definition:</b> Random.h:136</div></div>
<div class="ttc" id="namespaceUtils_html"><div class="ttname"><a href="namespaceUtils.html">Utils</a></div><div class="ttdoc">A set of useful method and class.</div><div class="ttdef"><b>Definition:</b> Random.cpp:27</div></div>
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