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<div class="refentry">
<a name="boost.random.lagged_fibonacci"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template lagged_fibonacci</span></h2>
<p>boost::random::lagged_fibonacci</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.lagged_fibonacci_hpp" title="Header &lt;boost/random/lagged_fibonacci.hpp&gt;">boost/random/lagged_fibonacci.hpp</a>&gt;
</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> UIntType<span class="special">,</span> <span class="keyword">int</span> w<span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> p<span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> q<span class="special">,</span>
<span class="identifier">UIntType</span> val <span class="special">=</span> <span class="number">0</span><span class="special">&gt;</span>
<span class="keyword">class</span> <a class="link" href="lagged_fibonacci.html" title="Class template lagged_fibonacci">lagged_fibonacci</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.lagged_fibonacci.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
<span class="comment">// <a class="link" href="lagged_fibonacci.html#boost.random.lagged_fibonacciconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="lagged_fibonacci.html#id1144720-bb"><span class="identifier">lagged_fibonacci</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="lagged_fibonacci.html#id1144732-bb"><span class="identifier">lagged_fibonacci</span></a><span class="special">(</span><span class="identifier">uint32_t</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> It<span class="special">&gt;</span> <a class="link" href="lagged_fibonacci.html#id1144750-bb"><span class="identifier">lagged_fibonacci</span></a><span class="special">(</span><span class="identifier">It</span> <span class="special">&amp;</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="lagged_fibonacci.html#id1144619-bb">public member functions</a></span>
<span class="identifier">result_type</span> <a class="link" href="lagged_fibonacci.html#id1144622-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="identifier">result_type</span> <a class="link" href="lagged_fibonacci.html#id1144634-bb"><span class="identifier">max</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="lagged_fibonacci.html#id1144646-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">uint32_t</span> <span class="special">=</span> <span class="number">331u</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> It<span class="special">&gt;</span> <span class="keyword">void</span> <a class="link" href="lagged_fibonacci.html#id1144672-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">It</span> <span class="special">&amp;</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="lagged_fibonacci.html#id1144708-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="comment">// <a class="link" href="lagged_fibonacci.html#id1144781-bb">public static functions</a></span>
<span class="keyword">static</span> <span class="keyword">bool</span> <a class="link" href="lagged_fibonacci.html#id1144785-bb"><span class="identifier">validation</span></a><span class="special">(</span><span class="identifier">result_type</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</span> has_fixed_range<span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> word_size<span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> long_lag<span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> short_lag<span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id2488587"></a><h2>Description</h2>
<p>Instantiations of class template <a class="link" href="lagged_fibonacci.html" title="Class template lagged_fibonacci">lagged_fibonacci</a> 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 uses a lagged Fibonacci algorithm with two lags <code class="computeroutput">p</code> and <code class="computeroutput">q:</code> x(i) = x(i-p) + x(i-q) (mod 2<sup>w</sup>) with p &gt; q. </p>
<div class="refsect2">
<a name="id2488627"></a><h3>
<a name="boost.random.lagged_fibonacciconstruct-copy-destruct"></a><code class="computeroutput">lagged_fibonacci</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="id1144720-bb"></a><span class="identifier">lagged_fibonacci</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Creates a new <code class="computeroutput">lagged_fibonacci</code> generator and calls <code class="computeroutput">seed()</code> </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="id1144732-bb"></a><span class="identifier">lagged_fibonacci</span><span class="special">(</span><span class="identifier">uint32_t</span> value<span class="special">)</span><span class="special">;</span></pre>
<p>Creates a new <code class="computeroutput">lagged_fibonacci</code> generator and calls <code class="computeroutput">seed(value)</code> </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> It<span class="special">&gt;</span> <a name="id1144750-bb"></a><span class="identifier">lagged_fibonacci</span><span class="special">(</span><span class="identifier">It</span> <span class="special">&amp;</span> first<span class="special">,</span> <span class="identifier">It</span> last<span class="special">)</span><span class="special">;</span></pre>
<p>Creates a new <code class="computeroutput">lagged_fibonacci</code> generator and calls <code class="computeroutput">seed(first, last)</code> </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id2488827"></a><h3>
<a name="id1144619-bb"></a><code class="computeroutput">lagged_fibonacci</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="identifier">result_type</span> <a name="id1144622-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 generator can produce </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">result_type</span> <a name="id1144634-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 generator can produce </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="id1144646-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">uint32_t</span> value <span class="special">=</span> <span class="number">331u</span><span class="special">)</span><span class="special">;</span></pre>
<p>Sets the state of the generator to values produced by a <code class="computeroutput"><a class="link" href="../minstd_rand.html" title="Type definition minstd_rand">minstd_rand</a></code> generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> It<span class="special">&gt;</span> <span class="keyword">void</span> <a name="id1144672-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">It</span> <span class="special">&amp;</span> first<span class="special">,</span> <span class="identifier">It</span> last<span class="special">)</span><span class="special">;</span></pre>
<p>Sets the state of the generator to values from the iterator range [first, last). If there are not enough elements in the range [first, last) throws <code class="computeroutput">std::invalid_argument</code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">result_type</span> <a name="id1144708-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>
</ol></div>
</div>
<div class="refsect2">
<a name="id2489129"></a><h3>
<a name="id1144781-bb"></a><code class="computeroutput">lagged_fibonacci</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="keyword">bool</span> <a name="id1144785-bb"></a><span class="identifier">validation</span><span class="special">(</span><span class="identifier">result_type</span> x<span class="special">)</span><span class="special">;</span></pre></li></ol></div>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2000 -2005 Jens Maurer, 2009 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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