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| <a name="boost.random.lagged_fibonacci_engine"></a><div class="titlepage"></div> |
| <div class="refnamediv"> |
| <h2><span class="refentrytitle">Class template lagged_fibonacci_engine</span></h2> |
| <p>boost::random::lagged_fibonacci_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.lagged_fibonacci_hpp" title="Header <boost/random/lagged_fibonacci.hpp>">boost/random/lagged_fibonacci.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">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="keyword">class</span> <a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_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.lagged_fibonacci_engine.result_type"></a><span class="identifier">result_type</span><span class="special">;</span> |
| |
| <span class="comment">// <a class="link" href="lagged_fibonacci_engine.html#boost.random.lagged_fibonacci_engineconstruct-copy-destruct">construct/copy/destruct</a></span> |
| <a class="link" href="lagged_fibonacci_engine.html#id1246718-bb"><span class="identifier">lagged_fibonacci_engine</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">explicit</span> <a class="link" href="lagged_fibonacci_engine.html#id1246734-bb"><span class="identifier">lagged_fibonacci_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="lagged_fibonacci_engine.html#id1246758-bb"><span class="identifier">lagged_fibonacci_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="lagged_fibonacci_engine.html#id1246789-bb"><span class="identifier">lagged_fibonacci_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="lagged_fibonacci_engine.html#id1246525-bb">public static functions</a></span> |
| <span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="lagged_fibonacci_engine.html#id1246528-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="lagged_fibonacci_engine.html#id1246541-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="lagged_fibonacci_engine.html#id1246553-bb">public member functions</a></span> |
| <span class="keyword">void</span> <a class="link" href="lagged_fibonacci_engine.html#id1246556-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="lagged_fibonacci_engine.html#id1246572-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="lagged_fibonacci_engine.html#id1246595-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="lagged_fibonacci_engine.html#id1246620-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="lagged_fibonacci_engine.html#id1246656-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="lagged_fibonacci_engine.html#id1246667-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="lagged_fibonacci_engine.html#id1246697-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="lagged_fibonacci_engine.html#id1246823-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="lagged_fibonacci_engine.html#id1246827-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="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_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="lagged_fibonacci_engine.html#id1246870-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="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_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="lagged_fibonacci_engine.html#id1246914-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_engine</a> <span class="special">&</span><span class="special">,</span> |
| <span class="keyword">const</span> <a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_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="lagged_fibonacci_engine.html#id1246945-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_engine</a> <span class="special">&</span><span class="special">,</span> |
| <span class="keyword">const</span> <a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_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">unsigned</span> <span class="keyword">int</span> <span class="identifier">long_lag</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">short_lag</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="id2691415"></a><h2>Description</h2> |
| <p>Instantiations of class template <a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_engine</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 > q. </p> |
| <div class="refsect2"> |
| <a name="id2691456"></a><h3> |
| <a name="boost.random.lagged_fibonacci_engineconstruct-copy-destruct"></a><code class="computeroutput">lagged_fibonacci_engine</code> |
| public |
| construct/copy/destruct</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"> |
| <li class="listitem"> |
| <pre class="literallayout"><a name="id1246718-bb"></a><span class="identifier">lagged_fibonacci_engine</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> |
| <p>Creates a new <code class="computeroutput"><code class="computeroutput"><a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_engine</a></code></code> and calls <code class="computeroutput">seed()</code>. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">explicit</span> <a name="id1246734-bb"></a><span class="identifier">lagged_fibonacci_engine</span><span class="special">(</span><span class="identifier">UIntType</span> value<span class="special">)</span><span class="special">;</span></pre> |
| <p>Creates a new <code class="computeroutput"><code class="computeroutput"><a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_engine</a></code></code> and calls <code class="computeroutput">seed(value)</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">explicit</span> <a name="id1246758-bb"></a><span class="identifier">lagged_fibonacci_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>Creates a new <code class="computeroutput"><code class="computeroutput"><a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_engine</a></code></code> and calls <code class="computeroutput">seed(seq)</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="id1246789-bb"></a><span class="identifier">lagged_fibonacci_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>Creates a new <code class="computeroutput"><code class="computeroutput"><a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_engine</a></code></code> and calls <code class="computeroutput">seed(first, last)</code>. </p> |
| </li> |
| </ol></div> |
| </div> |
| <div class="refsect2"> |
| <a name="id2691776"></a><h3> |
| <a name="id1246525-bb"></a><code class="computeroutput">lagged_fibonacci_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="id1246528-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="id1246541-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="id2691881"></a><h3> |
| <a name="id1246553-bb"></a><code class="computeroutput">lagged_fibonacci_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="id1246556-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> |
| <p>Calls <code class="computeroutput">seed(default_seed)</code>. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">void</span> <a name="id1246572-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">UIntType</span> value<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_rand0.html" title="Type definition minstd_rand0">minstd_rand0</a></code> 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="id1246595-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>Sets the state of the generator using values produced by 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> <span class="keyword">void</span> <a name="id1246620-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>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="id1246656-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="id1246667-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="id1246697-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="id2692331"></a><h3> |
| <a name="id1246823-bb"></a><code class="computeroutput">lagged_fibonacci_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="id1246827-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="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_engine</a> <span class="special">&</span> f<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="id1246870-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="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_engine</a> <span class="special">&</span> f<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> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="id1246914-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_engine</a> <span class="special">&</span> x<span class="special">,</span> |
| <span class="keyword">const</span> <a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_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> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="id1246945-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_engine</a> <span class="special">&</span> lhs<span class="special">,</span> |
| <span class="keyword">const</span> <a class="link" href="lagged_fibonacci_engine.html" title="Class template lagged_fibonacci_engine">lagged_fibonacci_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> |
| </li> |
| </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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