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<div class="refentry">
<a name="boost.random.independent_bits_engine"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template independent_bits_engine</span></h2>
<p>boost::random::independent_bits_engine</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: <<a class="link" href="../../boost_random/reference.html#header.boost.random.independent_bits_hpp" title="Header <boost/random/independent_bits.hpp>">boost/random/independent_bits.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Engine<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> w<span class="special">,</span> <span class="keyword">typename</span> UIntType<span class="special">></span>
<span class="keyword">class</span> <a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</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="identifier">Engine</span> <a name="boost.random.independent_bits_engine.base_type"></a><span class="identifier">base_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">UIntType</span> <a name="boost.random.independent_bits_engine.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
<span class="comment">// <a class="link" href="independent_bits_engine.html#boost.random.independent_bits_engineconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="independent_bits_engine.html#idp158755616-bb"><span class="identifier">independent_bits_engine</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">explicit</span> <a class="link" href="independent_bits_engine.html#idp159694288-bb"><span class="identifier">independent_bits_engine</span></a><span class="special">(</span><span class="identifier">result_type</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> SeedSeq<span class="special">></span> <span class="keyword">explicit</span> <a class="link" href="independent_bits_engine.html#idp159691728-bb"><span class="identifier">independent_bits_engine</span></a><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="independent_bits_engine.html#idp159688352-bb"><span class="identifier">independent_bits_engine</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">base_type</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <a class="link" href="independent_bits_engine.html#idp159686304-bb"><span class="identifier">independent_bits_engine</span></a><span class="special">(</span><span class="identifier">It</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">It</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="independent_bits_engine.html#idp155815152-bb">public static functions</a></span>
<span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="independent_bits_engine.html#idp214568656-bb"><span class="identifier">min</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="independent_bits_engine.html#idp214566688-bb"><span class="identifier">max</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="independent_bits_engine.html#idp214565376-bb">public member functions</a></span>
<span class="keyword">void</span> <a class="link" href="independent_bits_engine.html#idp214565248-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="independent_bits_engine.html#idp214562752-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">result_type</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> SeedSeq<span class="special">></span> <span class="keyword">void</span> <a class="link" href="independent_bits_engine.html#idp214560528-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <span class="keyword">void</span> <a class="link" href="independent_bits_engine.html#idp103570752-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">It</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">It</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">result_type</span> <a class="link" href="independent_bits_engine.html#idp158762768-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Iter<span class="special">></span> <span class="keyword">void</span> <a class="link" href="independent_bits_engine.html#idp158761200-bb"><span class="identifier">generate</span></a><span class="special">(</span><span class="identifier">Iter</span><span class="special">,</span> <span class="identifier">Iter</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="independent_bits_engine.html#idp158758176-bb"><span class="identifier">discard</span></a><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uintmax_t</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">const</span> <span class="identifier">base_type</span> <span class="special">&</span> <a class="link" href="independent_bits_engine.html#idp158756256-bb"><span class="identifier">base</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="independent_bits_engine.html#idp159681360-bb">friend functions</a></span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span>
<a class="link" href="independent_bits_engine.html#idp159681856-bb"><span class="keyword">operator</span><span class="special"><<</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span>
<a class="link" href="independent_bits_engine.html#idp156337888-bb"><span class="keyword">operator</span><span class="special">>></span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="independent_bits_engine.html#idp156331168-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="independent_bits_engine.html#idp151207312-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// public data members</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</span> <span class="identifier">has_fixed_range</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp403082912"></a><h2>Description</h2>
<p>An instantiation of class template <code class="computeroutput"><a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a></code> model a <a class="link" href="../../boost_random/reference.html#boost_random.reference.concepts.pseudo_random_number_generator" title="Pseudo-Random Number Generator">pseudo-random number generator</a> . It generates random numbers distributed between [0, 2^w) by combining one or more invocations of the base engine.</p>
<p>Requires: 0 < w <= std::numeric_limits<UIntType>::digits </p>
<div class="refsect2">
<a name="idp403086336"></a><h3>
<a name="boost.random.independent_bits_engineconstruct-copy-destruct"></a><code class="computeroutput">independent_bits_engine</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="idp158755616-bb"></a><span class="identifier">independent_bits_engine</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Constructs an <code class="computeroutput"><code class="computeroutput"><a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a></code></code> using the default constructor of the base generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="idp159694288-bb"></a><span class="identifier">independent_bits_engine</span><span class="special">(</span><span class="identifier">result_type</span> seed<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs an <code class="computeroutput"><code class="computeroutput"><a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a></code></code>, using seed as the constructor argument for both base generators. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> SeedSeq<span class="special">></span> <span class="keyword">explicit</span> <a name="idp159691728-bb"></a><span class="identifier">independent_bits_engine</span><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span> seq<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs an <code class="computeroutput"><code class="computeroutput"><a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a></code></code>, using seq as the constructor argument for the base generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp159688352-bb"></a><span class="identifier">independent_bits_engine</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">base_type</span> <span class="special">&</span> base_arg<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs an <code class="computeroutput"><code class="computeroutput"><a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a></code></code> by copying <code class="computeroutput">base</code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <a name="idp159686304-bb"></a><span class="identifier">independent_bits_engine</span><span class="special">(</span><span class="identifier">It</span> <span class="special">&</span> first<span class="special">,</span> <span class="identifier">It</span> last<span class="special">)</span><span class="special">;</span></pre>
<p>Contructs an <code class="computeroutput"><code class="computeroutput"><a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a></code></code> with values from the range defined by the input iterators first and last. first will be modified to point to the element after the last one used.</p>
<p>Throws: <code class="computeroutput">std::invalid_argument</code> if the input range is too small.</p>
<p>Exception Safety: Basic </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idp403132064"></a><h3>
<a name="idp155815152-bb"></a><code class="computeroutput">independent_bits_engine</code> public static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">result_type</span> <a name="idp214568656-bb"></a><span class="identifier">min</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Returns the smallest value that the generator can produce. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">result_type</span> <a name="idp214566688-bb"></a><span class="identifier">max</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Returns the largest value that the generator can produce. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idp403144912"></a><h3>
<a name="idp214565376-bb"></a><code class="computeroutput">independent_bits_engine</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp214565248-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Seeds an <code class="computeroutput"><code class="computeroutput"><a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a></code></code> using the default seed of the base generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp214562752-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">result_type</span> seed<span class="special">)</span><span class="special">;</span></pre>
<p>Seeds an <code class="computeroutput"><code class="computeroutput"><a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a></code></code>, using <code class="computeroutput">seed</code> as the seed for the base generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> SeedSeq<span class="special">></span> <span class="keyword">void</span> <a name="idp214560528-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span> seq<span class="special">)</span><span class="special">;</span></pre>
<p>Seeds an <code class="computeroutput"><code class="computeroutput"><a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a></code></code>, using <code class="computeroutput">seq</code> to seed the base generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <span class="keyword">void</span> <a name="idp103570752-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">It</span> <span class="special">&</span> first<span class="special">,</span> <span class="identifier">It</span> last<span class="special">)</span><span class="special">;</span></pre>
<p>Seeds an <code class="computeroutput"><code class="computeroutput"><a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a></code></code> with values from the range defined by the input iterators first and last. first will be modified to point to the element after the last one used.</p>
<p>Throws: <code class="computeroutput">std::invalid_argument</code> if the input range is too small.</p>
<p>Exception Safety: Basic </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">result_type</span> <a name="idp158762768-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Returns the next value of the generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Iter<span class="special">></span> <span class="keyword">void</span> <a name="idp158761200-bb"></a><span class="identifier">generate</span><span class="special">(</span><span class="identifier">Iter</span> first<span class="special">,</span> <span class="identifier">Iter</span> last<span class="special">)</span><span class="special">;</span></pre>
<p>Fills a range with random values </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp158758176-bb"></a><span class="identifier">discard</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uintmax_t</span> z<span class="special">)</span><span class="special">;</span></pre>
<p>Advances the state of the generator by <code class="computeroutput">z</code>. </p>
</li>
<li class="listitem"><pre class="literallayout"><span class="keyword">const</span> <span class="identifier">base_type</span> <span class="special">&</span> <a name="idp158756256-bb"></a><span class="identifier">base</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
</ol></div>
</div>
<div class="refsect2">
<a name="idp403213280"></a><h3>
<a name="idp159681360-bb"></a><code class="computeroutput">independent_bits_engine</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"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span>
<a name="idp159681856-bb"></a><span class="keyword">operator</span><span class="special"><<</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> os<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a> <span class="special">&</span> r<span class="special">)</span><span class="special">;</span></pre>
<p>Writes the textual representation if the generator to a <code class="computeroutput">std::ostream</code>. The textual representation of the engine is the textual representation of the base engine. </p>
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<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span>
<a name="idp156337888-bb"></a><span class="keyword">operator</span><span class="special">>></span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> is<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a> <span class="special">&</span> r<span class="special">)</span><span class="special">;</span></pre>
<p>Reads the state of an <code class="computeroutput"><code class="computeroutput"><a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a></code></code> 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="idp156331168-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a> <span class="special">&</span> x<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a> <span class="special">&</span> y<span class="special">)</span><span class="special">;</span></pre>
<p>Returns: true iff the two <code class="computeroutput">independent_bits_engines</code> will produce the same sequence of values. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="idp151207312-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a> <span class="special">&</span> lhs<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="independent_bits_engine.html" title="Class template independent_bits_engine">independent_bits_engine</a> <span class="special">&</span> rhs<span class="special">)</span><span class="special">;</span></pre>
<p>Returns: true iff the two <code class="computeroutput">independent_bits_engines</code> will produce different sequences of values. </p>
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</ol></div>
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<td align="right"><div class="copyright-footer">Copyright © 2000-2005 Jens Maurer<br>Copyright © 2009, 2010 Steven Watanabe<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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