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<title>libstdc++: std::mersenne_twister_engine< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f > Class Template Reference</title>
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<div class="title">std::mersenne_twister_engine< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f > Class Template Reference<div class="ingroups"><a class="el" href="a01473.html">Numerics</a> » <a class="el" href="a01491.html">Random Number Generation</a> » <a class="el" href="a01531.html">Random Number Generators</a></div></div> </div>
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Public Types</h2></td></tr>
<tr class="memitem:ab1ad02d59f290faf3d8b33e1209cdfae"><td class="memItemLeft" align="right" valign="top">typedef _UIntType </td><td class="memItemRight" valign="bottom"><a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a></td></tr>
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Public Member Functions</h2></td></tr>
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 </td><td class="memItemRight" valign="bottom"><b>mersenne_twister_engine</b> (<a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a> __sd=default_seed)</td></tr>
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<tr class="memitem:a8987d5bb70c31ba8e4bb80f993acff85"><td class="memTemplParams" colspan="2">template<typename _Sseq , typename = typename std::enable_if<!std::is_same<_Sseq, mersenne_twister_engine>::value> ::type> </td></tr>
<tr class="memitem:a8987d5bb70c31ba8e4bb80f993acff85"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06272.html#a8987d5bb70c31ba8e4bb80f993acff85">mersenne_twister_engine</a> (_Sseq &__q)</td></tr>
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<tr class="memitem:a5e2f7304fcf0b11ea1cde1397fb7ddb6"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="a06272.html#a5e2f7304fcf0b11ea1cde1397fb7ddb6">discard</a> (unsigned long long __z)</td></tr>
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<a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a> </td><td class="memItemRight" valign="bottom"><b>operator()</b> ()</td></tr>
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void </td><td class="memItemRight" valign="bottom"><b>seed</b> (<a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a> __sd=default_seed)</td></tr>
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template<typename _Sseq > </td></tr>
<tr class="memitem:a5f5cc8508fce57c6a0e87e52a9a51555"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a04188.html">std::enable_if</a>< <a class="el" href="a03280.html">std::is_class</a>< _Sseq >::value >::type </td><td class="memTemplItemRight" valign="bottom"><b>seed</b> (_Sseq &__q)</td></tr>
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Static Public Member Functions</h2></td></tr>
<tr class="memitem:a8e9cd7d4bb14de188ead958d3f1faeac"><td class="memItemLeft" align="right" valign="top">static constexpr <a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a06272.html#a8e9cd7d4bb14de188ead958d3f1faeac">max</a> ()</td></tr>
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<tr class="memitem:aaf1720ef1664fa77a5972c78addfa290"><td class="memItemLeft" align="right" valign="top">static constexpr <a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a06272.html#aaf1720ef1664fa77a5972c78addfa290">min</a> ()</td></tr>
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Static Public Attributes</h2></td></tr>
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static constexpr <a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a> </td><td class="memItemRight" valign="bottom"><b>default_seed</b></td></tr>
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static constexpr <a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a> </td><td class="memItemRight" valign="bottom"><b>initialization_multiplier</b></td></tr>
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static constexpr size_t </td><td class="memItemRight" valign="bottom"><b>mask_bits</b></td></tr>
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static constexpr size_t </td><td class="memItemRight" valign="bottom"><b>shift_size</b></td></tr>
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static constexpr size_t </td><td class="memItemRight" valign="bottom"><b>state_size</b></td></tr>
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static constexpr <a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a> </td><td class="memItemRight" valign="bottom"><b>tempering_b</b></td></tr>
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static constexpr <a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a> </td><td class="memItemRight" valign="bottom"><b>tempering_c</b></td></tr>
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static constexpr <a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a> </td><td class="memItemRight" valign="bottom"><b>tempering_d</b></td></tr>
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static constexpr size_t </td><td class="memItemRight" valign="bottom"><b>tempering_l</b></td></tr>
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static constexpr size_t </td><td class="memItemRight" valign="bottom"><b>tempering_s</b></td></tr>
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static constexpr size_t </td><td class="memItemRight" valign="bottom"><b>tempering_t</b></td></tr>
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static constexpr size_t </td><td class="memItemRight" valign="bottom"><b>tempering_u</b></td></tr>
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static constexpr size_t </td><td class="memItemRight" valign="bottom"><b>word_size</b></td></tr>
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static constexpr <a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a> </td><td class="memItemRight" valign="bottom"><b>xor_mask</b></td></tr>
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Friends</h2></td></tr>
<tr class="memitem:acc44ab3c56e9048acd13c60ca1a877e0"><td class="memTemplParams" colspan="2">template<typename _UIntType1 , size_t __w1, size_t __n1, size_t __m1, size_t __r1, _UIntType1 __a1, size_t __u1, _UIntType1 __d1, size_t __s1, _UIntType1 __b1, size_t __t1, _UIntType1 __c1, size_t __l1, _UIntType1 __f1, typename _CharT , typename _Traits > </td></tr>
<tr class="memitem:acc44ab3c56e9048acd13c60ca1a877e0"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a02460.html">std::basic_ostream</a>< _CharT, _Traits > & </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06272.html#acc44ab3c56e9048acd13c60ca1a877e0">operator<<</a> (<a class="el" href="a02460.html">std::basic_ostream</a>< _CharT, _Traits > &__os, const <a class="el" href="a06272.html">std::mersenne_twister_engine</a>< _UIntType1, __w1, __n1, __m1, __r1, __a1, __u1, __d1, __s1, __b1, __t1, __c1, __l1, __f1 > &__x)</td></tr>
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<tr class="memitem:a96c6f6aabca5106a2db6ecc834bbddfe"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="a06272.html#a96c6f6aabca5106a2db6ecc834bbddfe">operator==</a> (const <a class="el" href="a06272.html">mersenne_twister_engine</a> &__lhs, const <a class="el" href="a06272.html">mersenne_twister_engine</a> &__rhs)</td></tr>
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<tr class="memitem:a4fe6e606a61991ce6007b14402043497"><td class="memTemplParams" colspan="2">template<typename _UIntType1 , size_t __w1, size_t __n1, size_t __m1, size_t __r1, _UIntType1 __a1, size_t __u1, _UIntType1 __d1, size_t __s1, _UIntType1 __b1, size_t __t1, _UIntType1 __c1, size_t __l1, _UIntType1 __f1, typename _CharT , typename _Traits > </td></tr>
<tr class="memitem:a4fe6e606a61991ce6007b14402043497"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a02456.html">std::basic_istream</a>< _CharT, _Traits > & </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06272.html#a4fe6e606a61991ce6007b14402043497">operator>></a> (<a class="el" href="a02456.html">std::basic_istream</a>< _CharT, _Traits > &__is, <a class="el" href="a06272.html">std::mersenne_twister_engine</a>< _UIntType1, __w1, __n1, __m1, __r1, __a1, __u1, __d1, __s1, __b1, __t1, __c1, __l1, __f1 > &__x)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template<typename _UIntType, size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f><br />
class std::mersenne_twister_engine< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f ></h3>
<p>A generalized feedback shift register discrete random number generator.</p>
<p>This algorithm avoids multiplication and division and is designed to be friendly to a pipelined architecture. If the parameters are chosen correctly, this generator will produce numbers with a very long period and fairly good apparent entropy, although still not cryptographically strong.</p>
<p>The best way to use this generator is with the predefined mt19937 class.</p>
<p>This algorithm was originally invented by Makoto Matsumoto and Takuji Nishimura.</p>
<dl class="tparams"><dt>Template Parameters</dt><dd>
<table class="tparams">
<tr><td class="paramname">__w</td><td>Word size, the number of bits in each element of the state vector. </td></tr>
<tr><td class="paramname">__n</td><td>The degree of recursion. </td></tr>
<tr><td class="paramname">__m</td><td>The period parameter. </td></tr>
<tr><td class="paramname">__r</td><td>The separation point bit index. </td></tr>
<tr><td class="paramname">__a</td><td>The last row of the twist matrix. </td></tr>
<tr><td class="paramname">__u</td><td>The first right-shift tempering matrix parameter. </td></tr>
<tr><td class="paramname">__d</td><td>The first right-shift tempering matrix mask. </td></tr>
<tr><td class="paramname">__s</td><td>The first left-shift tempering matrix parameter. </td></tr>
<tr><td class="paramname">__b</td><td>The first left-shift tempering matrix mask. </td></tr>
<tr><td class="paramname">__t</td><td>The second left-shift tempering matrix parameter. </td></tr>
<tr><td class="paramname">__c</td><td>The second left-shift tempering matrix mask. </td></tr>
<tr><td class="paramname">__l</td><td>The second right-shift tempering matrix parameter. </td></tr>
<tr><td class="paramname">__f</td><td>Initialization multiplier. </td></tr>
</table>
</dd>
</dl>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00437">437</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
</div><h2 class="groupheader">Member Typedef Documentation</h2>
<a id="ab1ad02d59f290faf3d8b33e1209cdfae"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ab1ad02d59f290faf3d8b33e1209cdfae">◆ </a></span>result_type</h2>
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template<typename _UIntType, size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> </div>
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<td class="memname">typedef _UIntType <a class="el" href="a06272.html">std::mersenne_twister_engine</a>< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f >::<a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a></td>
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<p>The type of the generated random value. </p>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00440">440</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
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</div>
<h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a8987d5bb70c31ba8e4bb80f993acff85">◆ </a></span>mersenne_twister_engine()</h2>
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template<typename _UIntType, size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> </div>
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template<typename _Sseq , typename = typename std::enable_if<!std::is_same<_Sseq, mersenne_twister_engine>::value> ::type> </div>
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<td class="memname"><a class="el" href="a06272.html">std::mersenne_twister_engine</a>< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f >::<a class="el" href="a06272.html">mersenne_twister_engine</a> </td>
<td>(</td>
<td class="paramtype">_Sseq & </td>
<td class="paramname"><em>__q</em></td><td>)</td>
<td></td>
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">explicit</span></span> </td>
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<p>Constructs a mersenne_twister_engine random number generator engine seeded from the seed sequence <code>__q</code>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__q</td><td>the seed sequence. </td></tr>
</table>
</dd>
</dl>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00501">501</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
<a id="a5e2f7304fcf0b11ea1cde1397fb7ddb6"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a5e2f7304fcf0b11ea1cde1397fb7ddb6">◆ </a></span>discard()</h2>
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template<typename _UIntType , size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> </div>
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<td class="memname">void <a class="el" href="a06272.html">std::mersenne_twister_engine</a>< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f >::discard </td>
<td>(</td>
<td class="paramtype">unsigned long long </td>
<td class="paramname"><em>__z</em></td><td>)</td>
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<p>Discard a sequence of random numbers. </p>
<p class="definition">Definition at line <a class="el" href="a17055_source.html#l00432">432</a> of file <a class="el" href="a17055_source.html">bits/random.tcc</a>.</p>
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<a id="a8e9cd7d4bb14de188ead958d3f1faeac"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a8e9cd7d4bb14de188ead958d3f1faeac">◆ </a></span>max()</h2>
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template<typename _UIntType, size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> </div>
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<td class="memname">static constexpr <a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a> <a class="el" href="a06272.html">std::mersenne_twister_engine</a>< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f >::max </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">static</span></span> </td>
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<p>Gets the largest possible value in the output range. </p>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00522">522</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aaf1720ef1664fa77a5972c78addfa290">◆ </a></span>min()</h2>
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template<typename _UIntType, size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> </div>
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<td class="memname">static constexpr <a class="el" href="a06272.html#ab1ad02d59f290faf3d8b33e1209cdfae">result_type</a> <a class="el" href="a06272.html">std::mersenne_twister_engine</a>< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f >::min </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">static</span></span> </td>
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<p>Gets the smallest possible value in the output range. </p>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00515">515</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
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<h2 class="groupheader">Friends And Related Function Documentation</h2>
<a id="acc44ab3c56e9048acd13c60ca1a877e0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#acc44ab3c56e9048acd13c60ca1a877e0">◆ </a></span>operator<<</h2>
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template<typename _UIntType, size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> </div>
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template<typename _UIntType1 , size_t __w1, size_t __n1, size_t __m1, size_t __r1, _UIntType1 __a1, size_t __u1, _UIntType1 __d1, size_t __s1, _UIntType1 __b1, size_t __t1, _UIntType1 __c1, size_t __l1, _UIntType1 __f1, typename _CharT , typename _Traits > </div>
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<td class="memname"><a class="el" href="a02460.html">std::basic_ostream</a><_CharT, _Traits>& operator<< </td>
<td>(</td>
<td class="paramtype"><a class="el" href="a02460.html">std::basic_ostream</a>< _CharT, _Traits > & </td>
<td class="paramname"><em>__os</em>, </td>
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<td class="paramtype">const <a class="el" href="a06272.html">std::mersenne_twister_engine</a>< _UIntType1, __w1, __n1, __m1, __r1, __a1, __u1, __d1, __s1, __b1, __t1, __c1, __l1, __f1 > & </td>
<td class="paramname"><em>__x</em> </td>
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<td>)</td>
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<span class="mlabels"><span class="mlabel">friend</span></span> </td>
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<p>Inserts the current state of a % mersenne_twister_engine random number generator engine <code>__x</code> into the output stream <code>__os</code>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__os</td><td>An output stream. </td></tr>
<tr><td class="paramname">__x</td><td>A % mersenne_twister_engine random number generator engine.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>The output stream with the state of <code>__x</code> inserted or in an error state. </dd></dl>
</div>
</div>
<a id="a96c6f6aabca5106a2db6ecc834bbddfe"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a96c6f6aabca5106a2db6ecc834bbddfe">◆ </a></span>operator==</h2>
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template<typename _UIntType, size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> </div>
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<td class="memname">bool operator== </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="a06272.html">mersenne_twister_engine</a>< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f > & </td>
<td class="paramname"><em>__lhs</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="a06272.html">mersenne_twister_engine</a>< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f > & </td>
<td class="paramname"><em>__rhs</em> </td>
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<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Compares two % mersenne_twister_engine random number generator objects of the same type for equality. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__lhs</td><td>A % mersenne_twister_engine random number generator object. </td></tr>
<tr><td class="paramname">__rhs</td><td>Another % mersenne_twister_engine random number generator object.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>true if the infinite sequences of generated values would be equal, false otherwise. </dd></dl>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00547">547</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a4fe6e606a61991ce6007b14402043497">◆ </a></span>operator>></h2>
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template<typename _UIntType, size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> </div>
<div class="memtemplate">
template<typename _UIntType1 , size_t __w1, size_t __n1, size_t __m1, size_t __r1, _UIntType1 __a1, size_t __u1, _UIntType1 __d1, size_t __s1, _UIntType1 __b1, size_t __t1, _UIntType1 __c1, size_t __l1, _UIntType1 __f1, typename _CharT , typename _Traits > </div>
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<td class="memname"><a class="el" href="a02456.html">std::basic_istream</a><_CharT, _Traits>& operator>> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="a02456.html">std::basic_istream</a>< _CharT, _Traits > & </td>
<td class="paramname"><em>__is</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="a06272.html">std::mersenne_twister_engine</a>< _UIntType1, __w1, __n1, __m1, __r1, __a1, __u1, __d1, __s1, __b1, __t1, __c1, __l1, __f1 > & </td>
<td class="paramname"><em>__x</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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</td>
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<span class="mlabels"><span class="mlabel">friend</span></span> </td>
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<p>Extracts the current state of a % mersenne_twister_engine random number generator engine <code>__x</code> from the input stream <code>__is</code>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__is</td><td>An input stream. </td></tr>
<tr><td class="paramname">__x</td><td>A % mersenne_twister_engine random number generator engine.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>The input stream with the state of <code>__x</code> extracted or in an error state. </dd></dl>
</div>
</div>
<hr/>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="a00452_source.html">random.h</a></li>
<li><a class="el" href="a17055_source.html">bits/random.tcc</a></li>
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