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<title>Class template bernoulli_distribution</title>
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<a name="boost.random.bernoulli_distribution"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template bernoulli_distribution</span></h2>
<p>boost::random::bernoulli_distribution</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../boost_random/reference.html#header.boost.random.bernoulli_distribution_hpp" title="Header &lt;boost/random/bernoulli_distribution.hpp&gt;">boost/random/bernoulli_distribution.hpp</a>&gt;
</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> RealType <span class="special">=</span> <span class="keyword">double</span><span class="special">&gt;</span>
<span class="keyword">class</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <span class="keyword">int</span> <a name="boost.random.bernoulli_distribution.input_type"></a><span class="identifier">input_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="keyword">bool</span> <a name="boost.random.bernoulli_distribution.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
<span class="comment">// member classes/structs/unions</span>
<span class="keyword">class</span> <a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <a class="link" href="bernoulli_distribution/param_type.html#boost.random.bernoulli_distribution.param_type.distribution_type"><span class="identifier">distribution_type</span></a><span class="special">;</span>
<span class="comment">// <a class="link" href="bernoulli_distribution/param_type.html#boost.random.bernoulli_distribution.param_typeconstruct-copy-destruct">construct/copy/destruct</a></span>
<span class="keyword">explicit</span> <a class="link" href="bernoulli_distribution/param_type.html#id1254580-bb"><span class="identifier">param_type</span></a><span class="special">(</span><span class="identifier">RealType</span> <span class="special">=</span> <span class="number">0</span><span class="special">.</span><span class="number">5</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="bernoulli_distribution/param_type.html#id1254565-bb">public member functions</a></span>
<span class="identifier">RealType</span> <a class="link" href="bernoulli_distribution/param_type.html#id1254568-bb"><span class="identifier">p</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="comment">// <a class="link" href="bernoulli_distribution/param_type.html#id1254598-bb">friend functions</a></span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">&gt;</span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span>
<a class="link" href="bernoulli_distribution/param_type.html#id1254601-bb"><span class="keyword">operator</span><span class="special">&lt;&lt;</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">&gt;</span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span>
<a class="link" href="bernoulli_distribution/param_type.html#id1254641-bb"><span class="keyword">operator</span><span class="special">&gt;&gt;</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="bernoulli_distribution/param_type.html#id1254680-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="bernoulli_distribution/param_type.html#id1254710-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span>
<span class="comment">// <a class="link" href="bernoulli_distribution.html#boost.random.bernoulli_distributionconstruct-copy-destruct">construct/copy/destruct</a></span>
<span class="keyword">explicit</span> <a class="link" href="bernoulli_distribution.html#id1254911-bb"><span class="identifier">bernoulli_distribution</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">RealType</span> <span class="special">&amp;</span> <span class="special">=</span> <span class="number">0</span><span class="special">.</span><span class="number">5</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">explicit</span> <a class="link" href="bernoulli_distribution.html#id1254936-bb"><span class="identifier">bernoulli_distribution</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="bernoulli_distribution.html#id1254752-bb">public member functions</a></span>
<span class="identifier">RealType</span> <a class="link" href="bernoulli_distribution.html#id1254756-bb"><span class="identifier">p</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="bernoulli_distribution.html#id1254768-bb"><span class="identifier">min</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="bernoulli_distribution.html#id1254780-bb"><span class="identifier">max</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <a class="link" href="bernoulli_distribution.html#id1254792-bb"><span class="identifier">param</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="bernoulli_distribution.html#id1254805-bb"><span class="identifier">param</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="bernoulli_distribution.html#id1254826-bb"><span class="identifier">reset</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Engine<span class="special">&gt;</span> <span class="keyword">bool</span> <a class="link" href="bernoulli_distribution.html#id1254839-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Engine</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Engine<span class="special">&gt;</span>
<span class="keyword">bool</span> <a class="link" href="bernoulli_distribution.html#id1254870-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Engine</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="comment">// <a class="link" href="bernoulli_distribution.html#id1254959-bb">friend functions</a></span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">&gt;</span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span>
<a class="link" href="bernoulli_distribution.html#id1254962-bb"><span class="keyword">operator</span><span class="special">&lt;&lt;</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">&gt;</span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span>
<a class="link" href="bernoulli_distribution.html#id1255006-bb"><span class="keyword">operator</span><span class="special">&gt;&gt;</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="bernoulli_distribution.html#id1255049-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <span class="special">&amp;</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="bernoulli_distribution.html#id1255081-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <span class="special">&amp;</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id2627520"></a><h2>Description</h2>
<p>Instantiations of class template <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> model a <a class="link" href="../../boost_random/reference.html#boost_random.reference.concepts.random_distribution" title="Random Distribution">random distribution</a> . Such a random distribution produces bool values distributed with probabilities P(true) = p and P(false) = 1-p. p is the parameter of the distribution. </p>
<div class="refsect2">
<a name="id2627546"></a><h3>
<a name="boost.random.bernoulli_distributionconstruct-copy-destruct"></a><code class="computeroutput">bernoulli_distribution</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="id1254911-bb"></a><span class="identifier">bernoulli_distribution</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">RealType</span> <span class="special">&amp;</span> p <span class="special">=</span> <span class="number">0</span><span class="special">.</span><span class="number">5</span><span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a <code class="computeroutput"><a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a></code> object. p is the parameter of the distribution.</p>
<p>Requires: 0 &lt;= p &lt;= 1 </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="id1254936-bb"></a><span class="identifier">bernoulli_distribution</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&amp;</span> param<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs <code class="computeroutput"><a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a></code> from its parameters </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id2627722"></a><h3>
<a name="id1254752-bb"></a><code class="computeroutput">bernoulli_distribution</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="identifier">RealType</span> <a name="id1254756-bb"></a><span class="identifier">p</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns: The "p" parameter of the distribution. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="id1254768-bb"></a><span class="identifier">min</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns the smallest value that the distribution can produce. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="id1254780-bb"></a><span class="identifier">max</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns the largest value that the distribution can produce. </p>
</li>
<li class="listitem">
<pre class="literallayout"><a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <a name="id1254792-bb"></a><span class="identifier">param</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns the parameters of the distribution. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="id1254805-bb"></a><span class="identifier">param</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&amp;</span> param<span class="special">)</span><span class="special">;</span></pre>
<p>Sets the parameters of the distribution. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="id1254826-bb"></a><span class="identifier">reset</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Effects: Subsequent uses of the distribution do not depend on values produced by any engine prior to invoking reset. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Engine<span class="special">&gt;</span> <span class="keyword">bool</span> <a name="id1254839-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Engine</span> <span class="special">&amp;</span> eng<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns: a random variate distributed according to the <code class="computeroutput"><a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a></code> . </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Engine<span class="special">&gt;</span>
<span class="keyword">bool</span> <a name="id1254870-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Engine</span> <span class="special">&amp;</span> eng<span class="special">,</span> <span class="keyword">const</span> <a class="link" href="bernoulli_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&amp;</span> param<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns: a random variate distributed according to the <code class="computeroutput"><a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a></code> with parameters specified by param. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id2628226"></a><h3>
<a name="id1254959-bb"></a><code class="computeroutput">bernoulli_distribution</code> friend functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">&gt;</span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span>
<a name="id1254962-bb"></a><span class="keyword">operator</span><span class="special">&lt;&lt;</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span> os<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <span class="special">&amp;</span> bd<span class="special">)</span><span class="special">;</span></pre>
<p>Writes the parameters of the distribution to a <code class="computeroutput">std::ostream</code>. </p>
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<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">&gt;</span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span>
<a name="id1255006-bb"></a><span class="keyword">operator</span><span class="special">&gt;&gt;</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span> is<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <span class="special">&amp;</span> bd<span class="special">)</span><span class="special">;</span></pre>
<p>Reads the parameters of the distribution from a <code class="computeroutput">std::istream</code>. </p>
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<li class="listitem">
<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="id1255049-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <span class="special">&amp;</span> lhs<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <span class="special">&amp;</span> rhs<span class="special">)</span><span class="special">;</span></pre>
<p>Returns true iff the two distributions will produce identical sequences of values given equal generators. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="id1255081-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <span class="special">&amp;</span> lhs<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="bernoulli_distribution.html" title="Class template bernoulli_distribution">bernoulli_distribution</a> <span class="special">&amp;</span> rhs<span class="special">)</span><span class="special">;</span></pre>
<p>Returns true iff the two distributions will produce different sequences of values given equal generators. </p>
</li>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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