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libstdc++-docs-8.4.0-1.mga7.noarch.rpm

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<div class="title">std::linear_congruential_engine&lt; _UIntType, __a, __c, __m &gt; Class Template Reference<div class="ingroups"><a class="el" href="a01476.html">Numerics</a> &raquo; <a class="el" href="a01494.html">Random Number Generation</a> &raquo; <a class="el" href="a01534.html">Random Number Generators</a></div></div>  </div>
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Public Types</h2></td></tr>
<tr class="memitem:ae47aa1543eb8eef0d874551586c0a8df"><td class="memItemLeft" align="right" valign="top">typedef _UIntType&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a06271.html#ae47aa1543eb8eef0d874551586c0a8df">result_type</a></td></tr>
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Public Member Functions</h2></td></tr>
<tr class="memitem:a0b67d6dfeedae260237da131ce55284c"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a06271.html#a0b67d6dfeedae260237da131ce55284c">linear_congruential_engine</a> (<a class="el" href="a06271.html#ae47aa1543eb8eef0d874551586c0a8df">result_type</a> __s=default_seed)</td></tr>
<tr class="separator:a0b67d6dfeedae260237da131ce55284c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a3e49cb7b04e60dfae94dd28844521da4"><td class="memTemplParams" colspan="2">template&lt;typename _Sseq , typename  = typename std::enable_if&lt;!std::is_same&lt;_Sseq, linear_congruential_engine&gt;::value&gt; ::type&gt; </td></tr>
<tr class="memitem:a3e49cb7b04e60dfae94dd28844521da4"><td class="memTemplItemLeft" align="right" valign="top">&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06271.html#a3e49cb7b04e60dfae94dd28844521da4">linear_congruential_engine</a> (_Sseq &amp;__q)</td></tr>
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<tr class="memitem:a6c3917727c95e3e73ea25871ebd21441"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a06271.html#a6c3917727c95e3e73ea25871ebd21441">discard</a> (unsigned long long __z)</td></tr>
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<tr class="memitem:ae42fad7d735fb5d8d96076f70f2f65d4"><td class="memItemLeft" align="right" valign="top"><a class="el" href="a06271.html#ae47aa1543eb8eef0d874551586c0a8df">result_type</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a06271.html#ae42fad7d735fb5d8d96076f70f2f65d4">operator()</a> ()</td></tr>
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<tr class="memitem:aa0c9986cf366682ff3311bca8021ee19"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a06271.html#aa0c9986cf366682ff3311bca8021ee19">seed</a> (<a class="el" href="a06271.html#ae47aa1543eb8eef0d874551586c0a8df">result_type</a> __s=default_seed)</td></tr>
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Static Public Member Functions</h2></td></tr>
<tr class="memitem:af334bf0422c2d5ef522e3dac8427d63a"><td class="memItemLeft" align="right" valign="top">static constexpr <a class="el" href="a06271.html#ae47aa1543eb8eef0d874551586c0a8df">result_type</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a06271.html#af334bf0422c2d5ef522e3dac8427d63a">max</a> ()</td></tr>
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<tr class="memitem:a57c283a281f9b007e0a7659b57586f52"><td class="memItemLeft" align="right" valign="top">static constexpr <a class="el" href="a06271.html#ae47aa1543eb8eef0d874551586c0a8df">result_type</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a06271.html#a57c283a281f9b007e0a7659b57586f52">min</a> ()</td></tr>
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Static Public Attributes</h2></td></tr>
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static constexpr <a class="el" href="a06271.html#ae47aa1543eb8eef0d874551586c0a8df">result_type</a>&#160;</td><td class="memItemRight" valign="bottom"><b>default_seed</b></td></tr>
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<tr class="memitem:a9c73f24c92d06c4aa7c5b2c37d8c6dcb"><td class="memItemLeft" align="right" valign="top">static constexpr <a class="el" href="a06271.html#ae47aa1543eb8eef0d874551586c0a8df">result_type</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a06271.html#a9c73f24c92d06c4aa7c5b2c37d8c6dcb">modulus</a></td></tr>
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Friends</h2></td></tr>
<tr class="memitem:af5e6423d264a9888844b74c2f9944199"><td class="memTemplParams" colspan="2">template&lt;typename _UIntType1 , _UIntType1 __a1, _UIntType1 __c1, _UIntType1 __m1, typename _CharT , typename _Traits &gt; </td></tr>
<tr class="memitem:af5e6423d264a9888844b74c2f9944199"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a02463.html">std::basic_ostream</a>&lt; _CharT, _Traits &gt; &amp;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06271.html#af5e6423d264a9888844b74c2f9944199">operator&lt;&lt;</a> (<a class="el" href="a02463.html">std::basic_ostream</a>&lt; _CharT, _Traits &gt; &amp;__os, const <a class="el" href="a06271.html">std::linear_congruential_engine</a>&lt; _UIntType1, __a1, __c1, __m1 &gt; &amp;__lcr)</td></tr>
<tr class="separator:af5e6423d264a9888844b74c2f9944199"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ab062526efb78cd1480aff1eb1544b341"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a06271.html#ab062526efb78cd1480aff1eb1544b341">operator==</a> (const <a class="el" href="a06271.html">linear_congruential_engine</a> &amp;__lhs, const <a class="el" href="a06271.html">linear_congruential_engine</a> &amp;__rhs)</td></tr>
<tr class="separator:ab062526efb78cd1480aff1eb1544b341"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a337332c3de4a035002d715e35f79c49f"><td class="memTemplParams" colspan="2">template&lt;typename _UIntType1 , _UIntType1 __a1, _UIntType1 __c1, _UIntType1 __m1, typename _CharT , typename _Traits &gt; </td></tr>
<tr class="memitem:a337332c3de4a035002d715e35f79c49f"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a02459.html">std::basic_istream</a>&lt; _CharT, _Traits &gt; &amp;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06271.html#a337332c3de4a035002d715e35f79c49f">operator&gt;&gt;</a> (<a class="el" href="a02459.html">std::basic_istream</a>&lt; _CharT, _Traits &gt; &amp;__is, <a class="el" href="a06271.html">std::linear_congruential_engine</a>&lt; _UIntType1, __a1, __c1, __m1 &gt; &amp;__lcr)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template&lt;typename _UIntType, _UIntType __a, _UIntType __c, _UIntType __m&gt;<br />
class std::linear_congruential_engine&lt; _UIntType, __a, __c, __m &gt;</h3>

<p>A model of a linear congruential random number generator. </p>
<p>A random number generator that produces pseudorandom numbers via linear function: </p><p class="formulaDsp">
<img class="formulaDsp" alt="\[ x_{i+1}\leftarrow(ax_{i} + c) \bmod m \]" src="form_0.png"/>
</p>
<p>The template parameter <code>_UIntType</code> must be an unsigned integral type large enough to store values up to (__m-1). If the template parameter <code>__m</code> is 0, the modulus <code>__m</code> used is std::numeric_limits&lt;_UIntType&gt;::max() plus 1. Otherwise, the template parameters <code>__a</code> and <code>__c</code> must be less than <code>__m</code>.</p>
<p>The size of the state is <img class="formulaInl" alt="$1$" src="form_1.png"/>. </p>

<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00229">229</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
</div><h2 class="groupheader">Member Typedef Documentation</h2>
<a id="ae47aa1543eb8eef0d874551586c0a8df"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ae47aa1543eb8eef0d874551586c0a8df">&#9670;&nbsp;</a></span>result_type</h2>

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template&lt;typename _UIntType, _UIntType __a, _UIntType __c, _UIntType __m&gt; </div>
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          <td class="memname">typedef _UIntType <a class="el" href="a06271.html">std::linear_congruential_engine</a>&lt; _UIntType, __a, __c, __m &gt;::<a class="el" href="a06271.html#ae47aa1543eb8eef0d874551586c0a8df">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#l00232">232</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>

</div>
</div>
<h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
<a id="a0b67d6dfeedae260237da131ce55284c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a0b67d6dfeedae260237da131ce55284c">&#9670;&nbsp;</a></span>linear_congruential_engine() <span class="overload">[1/2]</span></h2>

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<div class="memproto">
<div class="memtemplate">
template&lt;typename _UIntType, _UIntType __a, _UIntType __c, _UIntType __m&gt; </div>
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          <td class="memname"><a class="el" href="a06271.html">std::linear_congruential_engine</a>&lt; _UIntType, __a, __c, __m &gt;::<a class="el" href="a06271.html">linear_congruential_engine</a> </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="a06271.html#ae47aa1543eb8eef0d874551586c0a8df">result_type</a>&#160;</td>
          <td class="paramname"><em>__s</em> = <code>default_seed</code></td><td>)</td>
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<p>Constructs a linear_congruential_engine random number generator engine with seed <code>__s</code>. The default seed value is 1. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">__s</td><td>The initial seed value. </td></tr>
  </table>
  </dd>
</dl>

<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00256">256</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>

<p class="reference">References <a class="el" href="a17058_source.html#l00117">std::linear_congruential_engine&lt; _UIntType, __a, __c, __m &gt;::seed()</a>.</p>

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<a id="a3e49cb7b04e60dfae94dd28844521da4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a3e49cb7b04e60dfae94dd28844521da4">&#9670;&nbsp;</a></span>linear_congruential_engine() <span class="overload">[2/2]</span></h2>

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<div class="memtemplate">
template&lt;typename _UIntType, _UIntType __a, _UIntType __c, _UIntType __m&gt; </div>
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template&lt;typename _Sseq , typename  = typename std::enable_if&lt;!std::is_same&lt;_Sseq, linear_congruential_engine&gt;::value&gt; ::type&gt; </div>
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          <td class="memname"><a class="el" href="a06271.html">std::linear_congruential_engine</a>&lt; _UIntType, __a, __c, __m &gt;::<a class="el" href="a06271.html">linear_congruential_engine</a> </td>
          <td>(</td>
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<p>Constructs a linear_congruential_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#l00269">269</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>

<p class="reference">References <a class="el" href="a17058_source.html#l00117">std::linear_congruential_engine&lt; _UIntType, __a, __c, __m &gt;::seed()</a>.</p>

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<h2 class="groupheader">Member Function Documentation</h2>
<a id="a6c3917727c95e3e73ea25871ebd21441"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a6c3917727c95e3e73ea25871ebd21441">&#9670;&nbsp;</a></span>discard()</h2>

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template&lt;typename _UIntType, _UIntType __a, _UIntType __c, _UIntType __m&gt; </div>
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<p>Discard a sequence of random numbers. </p>

<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00313">313</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="#af334bf0422c2d5ef522e3dac8427d63a">&#9670;&nbsp;</a></span>max()</h2>

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template&lt;typename _UIntType, _UIntType __a, _UIntType __c, _UIntType __m&gt; </div>
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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#l00306">306</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="#a57c283a281f9b007e0a7659b57586f52">&#9670;&nbsp;</a></span>min()</h2>

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template&lt;typename _UIntType, _UIntType __a, _UIntType __c, _UIntType __m&gt; </div>
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<p>Gets the smallest possible value in the output range. </p>
<p>The minimum depends on the <code>__c</code> parameter: if it is zero, the minimum generated must be &gt; 0, otherwise 0 is allowed. </p>

<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00299">299</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="#ae42fad7d735fb5d8d96076f70f2f65d4">&#9670;&nbsp;</a></span>operator()()</h2>

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template&lt;typename _UIntType, _UIntType __a, _UIntType __c, _UIntType __m&gt; </div>
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<p>Gets the next random number in the sequence. </p>

<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00323">323</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="#aa0c9986cf366682ff3311bca8021ee19">&#9670;&nbsp;</a></span>seed() <span class="overload">[1/2]</span></h2>

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<p>Reseeds the linear_congruential_engine random number generator engine sequence to the seed <code>__s</code>. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<p>Seeds the LCR with integral value <code>__s</code>, adjusted so that the ring identity is never a member of the convergence set. </p>

<p class="definition">Definition at line <a class="el" href="a17058_source.html#l00117">117</a> of file <a class="el" href="a17058_source.html">bits/random.tcc</a>.</p>

<p class="reference">Referenced by <a class="el" href="a00452_source.html#l00256">std::linear_congruential_engine&lt; _UIntType, __a, __c, __m &gt;::linear_congruential_engine()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a635ce16bb986207c8f7fc80442295e52">&#9670;&nbsp;</a></span>seed() <span class="overload">[2/2]</span></h2>

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template&lt;typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m&gt; </div>
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template&lt;typename _Sseq &gt; </div>
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<p>Reseeds the linear_congruential_engine random number generator engine sequence using values from the seed sequence <code>__q</code>. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<p>Seeds the LCR engine with a value generated by <code>__q</code>. </p>

<p class="definition">Definition at line <a class="el" href="a17058_source.html#l00133">133</a> of file <a class="el" href="a17058_source.html">bits/random.tcc</a>.</p>

<p class="reference">References <a class="el" href="a00530_source.html#l01000">std::__lg()</a>.</p>

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<h2 class="groupheader">Friends And Related Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#af5e6423d264a9888844b74c2f9944199">&#9670;&nbsp;</a></span>operator&lt;&lt;</h2>

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<p>Writes the textual representation of the state x(i) of x to <code>__os</code>. </p>
<dl class="params"><dt>Parameters</dt><dd>
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    <tr><td class="paramname">__os</td><td>The output stream. </td></tr>
    <tr><td class="paramname">__lcr</td><td>A % linear_congruential_engine random number generator. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>__os. </dd></dl>

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<h2 class="memtitle"><span class="permalink"><a href="#ab062526efb78cd1480aff1eb1544b341">&#9670;&nbsp;</a></span>operator==</h2>

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<p>Compares two linear congruential random number generator objects of the same type for equality. </p>
<dl class="params"><dt>Parameters</dt><dd>
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    <tr><td class="paramname">__lhs</td><td>A linear congruential random number generator object. </td></tr>
    <tr><td class="paramname">__rhs</td><td>Another linear congruential random number generator object.</td></tr>
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<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#l00341">341</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="#a337332c3de4a035002d715e35f79c49f">&#9670;&nbsp;</a></span>operator&gt;&gt;</h2>

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<p>Sets the state of the engine by reading its textual representation from <code>__is</code>. </p>
<p>The textual representation must have been previously written using an output stream whose imbued locale and whose type's template specialization arguments _CharT and _Traits were the same as those of <code>__is</code>.</p>
<dl class="params"><dt>Parameters</dt><dd>
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    <tr><td class="paramname">__is</td><td>The input stream. </td></tr>
    <tr><td class="paramname">__lcr</td><td>A % linear_congruential_engine random number generator. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>__is. </dd></dl>

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<h2 class="groupheader">Member Data Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ad2d0da3af999df8d7992143640f344a6">&#9670;&nbsp;</a></span>increment</h2>

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template&lt;typename _UIntType, _UIntType __a, _UIntType __c, _UIntType __m&gt; </div>
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<p>An increment. </p>

<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00243">243</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>

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<p>The modulus. </p>

<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00245">245</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="#a5f6ca5414f03b35e0a82731cf9cd6496">&#9670;&nbsp;</a></span>multiplier</h2>

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template&lt;typename _UIntType, _UIntType __a, _UIntType __c, _UIntType __m&gt; </div>
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<p>The multiplier. </p>

<p class="definition">Definition at line <a class="el" href="a00452_source.html#l00241">241</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>

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<hr/>The documentation for this class was generated from the following files:<ul>
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