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<title>Class template linear_feedback_shift_engine</title>
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<a name="boost.random.linear_f_idm45507041557328"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template linear_feedback_shift_engine</span></h2>
<p>boost::random::linear_feedback_shift_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.linear_feedback_shift_hpp" title="Header <boost/random/linear_feedback_shift.hpp>">boost/random/linear_feedback_shift.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> UIntType<span class="special">,</span> <span class="keyword">int</span> w<span class="special">,</span> <span class="keyword">int</span> k<span class="special">,</span> <span class="keyword">int</span> q<span class="special">,</span> <span class="keyword">int</span> s<span class="special">></span>
<span class="keyword">class</span> <a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_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">UIntType</span> <a name="boost.random.linear_f_idm45507041557328.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
<span class="comment">// <a class="link" href="linear_f_idm45507041557328.html#boost.random.linear_f_idm45507041557328construct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="linear_f_idm45507041557328.html#idm45507087340784-bb"><span class="identifier">linear_feedback_shift_engine</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">explicit</span> <a class="link" href="linear_f_idm45507041557328.html#idm45507087342336-bb"><span class="identifier">linear_feedback_shift_engine</span></a><span class="special">(</span><span class="identifier">UIntType</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="linear_f_idm45507041557328.html#idm45507087345184-bb"><span class="identifier">linear_feedback_shift_engine</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> <a class="link" href="linear_f_idm45507041557328.html#idm45507104644144-bb"><span class="identifier">linear_feedback_shift_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="linear_f_idm45507041557328.html#idm45507102699632-bb">public static functions</a></span>
<span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="linear_f_idm45507041557328.html#idm45507102699056-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="linear_f_idm45507041557328.html#idm45507102701056-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="linear_f_idm45507041557328.html#idm45507102702416-bb">public member functions</a></span>
<span class="keyword">void</span> <a class="link" href="linear_f_idm45507041557328.html#idm45507102703568-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="linear_f_idm45507041557328.html#idm45507102705616-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">UIntType</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="linear_f_idm45507041557328.html#idm45507040631056-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="linear_f_idm45507041557328.html#idm45507040634896-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="linear_f_idm45507041557328.html#idm45506995271184-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="linear_f_idm45507041557328.html#idm45506995272624-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="linear_f_idm45507041557328.html#idm45506995276080-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="comment">// <a class="link" href="linear_f_idm45507041557328.html#idm45507104647168-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="linear_f_idm45507041557328.html#idm45507160683968-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="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_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="linear_f_idm45507041557328.html#idm45507104652128-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="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_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="linear_f_idm45507041557328.html#idm45506974660816-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_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="linear_f_idm45507041557328.html#idm45506974664112-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_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="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">word_size</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">exponent1</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">exponent2</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">step_size</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">UIntType</span> <span class="identifier">default_seed</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm45555153507824"></a><h2>Description</h2>
<p>Instatiations of <code class="computeroutput">linear_feedback_shift</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 was originally proposed in</p>
<p> </p>
<div class="blockquote"><blockquote class="blockquote"><p> "Random numbers generated by linear recurrence modulo two.", Tausworthe, R. C.(1965), Mathematics of Computation 19, 201-209. </p></blockquote></div>
<p> </p>
<div class="refsect2">
<a name="idm45555153504448"></a><h3>
<a name="boost.random.linear_f_idm45507041557328construct-copy-destruct"></a><code class="computeroutput">linear_feedback_shift_engine</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="idm45507087340784-bb"></a><span class="identifier">linear_feedback_shift_engine</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code>, using the default seed. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45507087342336-bb"></a><span class="identifier">linear_feedback_shift_engine</span><span class="special">(</span><span class="identifier">UIntType</span> s0<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code>, seeding it with s0. </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="idm45507087345184-bb"></a><span class="identifier">linear_feedback_shift_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 a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code>, seeding it with seq. </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="idm45507104644144-bb"></a><span class="identifier">linear_feedback_shift_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>Constructs a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code>, seeding it with values from the range [first, last). </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555153468512"></a><h3>
<a name="idm45507102699632-bb"></a><code class="computeroutput">linear_feedback_shift_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="idm45507102699056-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="idm45507102701056-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="idm45555153455712"></a><h3>
<a name="idm45507102702416-bb"></a><code class="computeroutput">linear_feedback_shift_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="idm45507102703568-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Seeds a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code> with the default seed. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm45507102705616-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">UIntType</span> s0<span class="special">)</span><span class="special">;</span></pre>
<p>Seeds a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code> with <code class="computeroutput">s0</code>. </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="idm45507040631056-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 a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code> with values produced by <code class="computeroutput">seq.generate()</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> <span class="keyword">void</span> <a name="idm45507040634896-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 a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code> with values from the range [first, last). </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">result_type</span> <a name="idm45506995271184-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="idm45506995272624-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="idm45506995276080-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>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555153395152"></a><h3>
<a name="idm45507104647168-bb"></a><code class="computeroutput">linear_feedback_shift_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="idm45507160683968-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="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span> x<span class="special">)</span><span class="special">;</span></pre>
<p>Writes the textual representation of the generator to a <code class="computeroutput">std::ostream</code>. </p>
</li>
<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="idm45507104652128-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="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span> x<span class="special">)</span><span class="special">;</span></pre>
<p>Reads the textual representation of the generator from a <code class="computeroutput">std::istream</code>. </p>
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<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="idm45506974660816-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span> x<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span> y<span class="special">)</span><span class="special">;</span></pre>
<p>Returns true if the two generators will produce identical sequences of outputs. </p>
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<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="idm45506974664112-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span> lhs<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="linear_f_idm45507041557328.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span> rhs<span class="special">)</span><span class="special">;</span></pre>
<p>Returns true if the two generators will produce different sequences of outputs. </p>
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