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<title>Class template discard_block_engine</title>
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<div class="refentry">
<a name="boost.random.discard_block_engine"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template discard_block_engine</span></h2>
<p>boost::random::discard_block_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.discard_block_hpp" title="Header <boost/random/discard_block.hpp>">boost/random/discard_block.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> p<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> r<span class="special">></span>
<span class="keyword">class</span> <a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_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.discard_block_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.discard_block_engine.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
<span class="comment">// <a class="link" href="discard_block_engine.html#boost.random.discard_block_engineconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="discard_block_engine.html#id1412555-bb"><span class="identifier">discard_block_engine</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">explicit</span> <a class="link" href="discard_block_engine.html#id1412560-bb"><span class="identifier">discard_block_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="discard_block_engine.html#id1412580-bb"><span class="identifier">discard_block_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">explicit</span> <a class="link" href="discard_block_engine.html#id1412599-bb"><span class="identifier">discard_block_engine</span></a><span class="special">(</span><span class="identifier">seed_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="discard_block_engine.html#id1412622-bb"><span class="identifier">discard_block_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="discard_block_engine.html#id1412652-bb"><span class="identifier">discard_block_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="discard_block_engine.html#id1412405-bb">public member functions</a></span>
<span class="keyword">void</span> <a class="link" href="discard_block_engine.html#id1412408-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="discard_block_engine.html#id1412420-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">seed_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="discard_block_engine.html#id1412437-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="discard_block_engine.html#id1412462-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="discard_block_engine.html#id1412492-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="discard_block_engine.html#id1412504-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="discard_block_engine.html#id1412515-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> It<span class="special">></span> <span class="keyword">void</span> <a class="link" href="discard_block_engine.html#id1412529-bb"><span class="identifier">generate</span></a><span class="special">(</span><span class="identifier">It</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="discard_block_engine.html#id1412682-bb">public static functions</a></span>
<span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="discard_block_engine.html#id1412686-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="discard_block_engine.html#id1412699-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="discard_block_engine.html#id1412712-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="discard_block_engine.html#id1412716-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="discard_block_engine.html" title="Class template discard_block_engine">discard_block_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="discard_block_engine.html#id1412765-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> <a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_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="discard_block_engine.html#id1412813-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_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="discard_block_engine.html#id1412845-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_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="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">block_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">used_block</span><span class="special">;</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">total_block</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">returned_block</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id2991126"></a><h2>Description</h2>
<p>The class template <a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a> is a model of <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 modifies another generator by discarding parts of its output. Out of every block of <code class="computeroutput">p</code> results, the first <code class="computeroutput">r</code> will be returned and the rest discarded.</p>
<p>Requires: 0 < p <= r </p>
<div class="refsect2">
<a name="id2991166"></a><h3>
<a name="boost.random.discard_block_engineconstruct-copy-destruct"></a><code class="computeroutput">discard_block_engine</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="id1412555-bb"></a><span class="identifier">discard_block_engine</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Uses the default seed for the base generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="id1412560-bb"></a><span class="identifier">discard_block_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 new <code class="computeroutput"><a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a></code> with a copy of rng. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="id1412580-bb"></a><span class="identifier">discard_block_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>
<p>Constructs a new <code class="computeroutput"><a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a></code> with rng. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="id1412599-bb"></a><span class="identifier">discard_block_engine</span><span class="special">(</span><span class="identifier">seed_type</span> value<span class="special">)</span><span class="special">;</span></pre>
<p>Creates a new <code class="computeroutput"><a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a></code> and seeds the underlying generator with <code class="computeroutput">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="id1412622-bb"></a><span class="identifier">discard_block_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"><a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a></code> and seeds the underlying generator with <code class="computeroutput">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="id1412652-bb"></a><span class="identifier">discard_block_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"><a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a></code> and seeds the underlying generator with first and last. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id2991580"></a><h3>
<a name="id1412405-bb"></a><code class="computeroutput">discard_block_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="id1412408-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>default seeds the underlying generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="id1412420-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">seed_type</span> s<span class="special">)</span><span class="special">;</span></pre>
<p>Seeds the underlying generator with s. </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="id1412437-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 the underlying generator 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> <span class="keyword">void</span> <a name="id1412462-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 the underlying generator with first and last. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">const</span> <span class="identifier">base_type</span> <span class="special">&</span> <a name="id1412492-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>
<p>Returns the underlying engine. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">result_type</span> <a name="id1412504-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">void</span> <a name="id1412515-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></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="id1412529-bb"></a><span class="identifier">generate</span><span class="special">(</span><span class="identifier">It</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="id2992048"></a><h3>
<a name="id1412682-bb"></a><code class="computeroutput">discard_block_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="id1412686-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. This is the same as the minimum of the underlying generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">result_type</span> <a name="id1412699-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. This is the same as the maximum of the underlying generator. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id2992154"></a><h3>
<a name="id1412712-bb"></a><code class="computeroutput">discard_block_engine</code> friend functions</h3>
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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="id1412716-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="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a> <span class="special">&</span> s<span class="special">)</span><span class="special">;</span></pre>
<p>Writes a <code class="computeroutput"><a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a></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="id1412765-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>
<a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a> <span class="special">&</span> s<span class="special">)</span><span class="special">;</span></pre>
<p>Reads a <code class="computeroutput"><a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a></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="id1412813-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a> <span class="special">&</span> x<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_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="id1412845-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_engine</a> <span class="special">&</span> x<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="discard_block_engine.html" title="Class template discard_block_engine">discard_block_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 different sequences. </p>
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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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