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<title>Class template shuffle_order_engine</title>
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<div class="refentry">
<a name="boost.random.shuffle_order_engine"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template shuffle_order_engine</span></h2>
<p>boost::random::shuffle_order_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.shuffle_order_hpp" title="Header <boost/random/shuffle_order.hpp>">boost/random/shuffle_order.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> UniformRandomNumberGenerator<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> k<span class="special">></span>
<span class="keyword">class</span> <a class="link" href="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_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">UniformRandomNumberGenerator</span> <a name="boost.random.shuffle_order_engine.base_type"></a><span class="identifier">base_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">base_type</span><span class="special">::</span><span class="identifier">result_type</span> <a name="boost.random.shuffle_order_engine.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
<span class="comment">// <a class="link" href="shuffle_order_engine.html#boost.random.shuffle_order_engineconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="shuffle_order_engine.html#id1304093-bb"><span class="identifier">shuffle_order_engine</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">explicit</span> <a class="link" href="shuffle_order_engine.html#id1304109-bb"><span class="identifier">shuffle_order_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="shuffle_order_engine.html#id1304130-bb"><span class="identifier">shuffle_order_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">explicit</span> <a class="link" href="shuffle_order_engine.html#id1304146-bb"><span class="identifier">shuffle_order_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">explicit</span> <a class="link" href="shuffle_order_engine.html#id1304170-bb"><span class="identifier">shuffle_order_engine</span></a><span class="special">(</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="shuffle_order_engine.html#id1304179-bb"><span class="identifier">shuffle_order_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="shuffle_order_engine.html#id1303942-bb">public member functions</a></span>
<span class="keyword">void</span> <a class="link" href="shuffle_order_engine.html#id1303945-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="shuffle_order_engine.html#id1303953-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="shuffle_order_engine.html#id1303975-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="shuffle_order_engine.html#id1304004-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="keyword">const</span> <span class="identifier">base_type</span> <span class="special">&</span> <a class="link" href="shuffle_order_engine.html#id1304030-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="identifier">result_type</span> <a class="link" href="shuffle_order_engine.html#id1304038-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">void</span> <a class="link" href="shuffle_order_engine.html#id1304045-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">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="shuffle_order_engine.html#id1304063-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="comment">// <a class="link" href="shuffle_order_engine.html#id1304198-bb">public static functions</a></span>
<span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="shuffle_order_engine.html#id1304201-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="shuffle_order_engine.html#id1304214-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="shuffle_order_engine.html#id1304226-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="shuffle_order_engine.html#id1304229-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="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_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="shuffle_order_engine.html#id1304280-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="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_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="shuffle_order_engine.html#id1304330-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_engine</a> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_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="shuffle_order_engine.html#id1304362-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_engine</a> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_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="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">buffer_size</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">table_size</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id3097508"></a><h2>Description</h2>
<p>Instatiations of class template <code class="computeroutput"><a class="link" href="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_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 mixes the output of some (usually <a class="link" href="linear_congruential_engine.html" title="Class template linear_congruential_engine">linear_congruential_engine</a>) <a class="link" href="../../boost_random/reference.html#boost_random.reference.concepts.uniform_random_number_generator" title="Uniform Random Number Generator">uniform random number generator</a> to get better statistical properties. The algorithm is described in</p>
<p> </p>
<div class="blockquote"><blockquote class="blockquote"><p> "Improving a poor random number generator", Carter Bays and S.D. Durham, ACM Transactions on Mathematical Software, Vol 2, No. 1, March 1976, pp. 59-64. <a href="http://doi.acm.org/10.1145/355666.355670" target="_top">http://doi.acm.org/10.1145/355666.355670</a> </p></blockquote></div>
<p> </p>
<p>The output of the base generator is buffered in an array of length k. Every output X(n) has a second role: It gives an index into the array where X(n+1) will be retrieved. Used array elements are replaced with fresh output from the base generator.</p>
<p>Template parameters are the base generator and the array length k, which should be around 100. </p>
<div class="refsect2">
<a name="id3097580"></a><h3>
<a name="boost.random.shuffle_order_engineconstruct-copy-destruct"></a><code class="computeroutput">shuffle_order_engine</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="id1304093-bb"></a><span class="identifier">shuffle_order_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="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_engine</a></code></code> by invoking the default constructor of the base generator.</p>
<p>Complexity: Exactly k+1 invocations of the base generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="id1304109-bb"></a><span class="identifier">shuffle_order_engine</span><span class="special">(</span><span class="identifier">result_type</span> s<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a <code class="computeroutput">shuffle_output_engine</code> by invoking the one-argument constructor of the base generator with the parameter seed.</p>
<p>Complexity: Exactly k+1 invocations of 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">explicit</span> <a name="id1304130-bb"></a><span class="identifier">shuffle_order_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></li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="id1304146-bb"></a><span class="identifier">shuffle_order_engine</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">base_type</span> <span class="special">&</span> rng<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a <code class="computeroutput">shuffle_output_engine</code> by using a copy of the provided generator.</p>
<p>Precondition: The template argument UniformRandomNumberGenerator shall denote a CopyConstructible type.</p>
<p>Complexity: Exactly k+1 invocations of the base generator. </p>
</li>
<li class="listitem"><pre class="literallayout"><span class="keyword">explicit</span> <a name="id1304170-bb"></a><span class="identifier">shuffle_order_engine</span><span class="special">(</span><span class="identifier">base_type</span> <span class="special">&&</span> rng<span class="special">)</span><span class="special">;</span></pre></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="id1304179-bb"></a><span class="identifier">shuffle_order_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></li>
</ol></div>
</div>
<div class="refsect2">
<a name="id3097958"></a><h3>
<a name="id1303942-bb"></a><code class="computeroutput">shuffle_order_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="id1303945-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="id1303953-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>Invokes the one-argument seed method of the base generator with the parameter seed and re-initializes the internal buffer array.</p>
<p>Complexity: Exactly k+1 invocations of 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="id1303975-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>Invokes the one-argument seed method of the base generator with the parameter seq and re-initializes the internal buffer array.</p>
<p>Complexity: Exactly k+1 invocations of 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="id1304004-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></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">const</span> <span class="identifier">base_type</span> <span class="special">&</span> <a name="id1304030-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>
<li class="listitem"><pre class="literallayout"><span class="identifier">result_type</span> <a name="id1304038-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></li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="id1304045-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 generator by z steps. </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="id1304063-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 pseudo-random values. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id3098434"></a><h3>
<a name="id1304198-bb"></a><code class="computeroutput">shuffle_order_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="id1304201-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="id1304214-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="id3098538"></a><h3>
<a name="id1304226-bb"></a><code class="computeroutput">shuffle_order_engine</code> friend functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
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<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="id1304229-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="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_engine</a> <span class="special">&</span> s<span class="special">)</span><span class="special">;</span></pre>
<p>Writes a <code class="computeroutput"><code class="computeroutput"><a class="link" href="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_engine</a></code></code> to a <code class="computeroutput">std::ostream</code>. </p>
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<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="id1304280-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="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_engine</a> <span class="special">&</span> s<span class="special">)</span><span class="special">;</span></pre>
<p>Reads a <code class="computeroutput"><code class="computeroutput"><a class="link" href="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_engine</a></code></code> 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="id1304330-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_engine</a> <span class="special">&</span> x<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_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. </p>
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<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="id1304362-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_engine</a> <span class="special">&</span> lhs<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="shuffle_order_engine.html" title="Class template shuffle_order_engine">shuffle_order_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. </p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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