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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: &lt;<a class="link" href="../../boost_random/reference.html#header.boost.random.discard_block_hpp" title="Header &lt;boost/random/discard_block.hpp&gt;">boost/random/discard_block.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</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">&gt;</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#idp59464424-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#idp59464728-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">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">explicit</span> <a class="link" href="discard_block_engine.html#idp59402376-bb"><span class="identifier">discard_block_engine</span></a><span class="special">(</span><span class="identifier">base_type</span> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">explicit</span> <a class="link" href="discard_block_engine.html#idp59462296-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">&lt;</span><span class="keyword">typename</span> SeedSeq<span class="special">&gt;</span> <span class="keyword">explicit</span> <a class="link" href="discard_block_engine.html#idp59461176-bb"><span class="identifier">discard_block_engine</span></a><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&amp;</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="discard_block_engine.html#idp59436568-bb"><span class="identifier">discard_block_engine</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="discard_block_engine.html#idp59454872-bb">public member functions</a></span>
  <span class="keyword">void</span> <a class="link" href="discard_block_engine.html#idp59455080-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#idp59455784-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">&lt;</span><span class="keyword">typename</span> SeedSeq<span class="special">&gt;</span> <span class="keyword">void</span> <a class="link" href="discard_block_engine.html#idp59456824-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&amp;</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="discard_block_engine.html#idp59458280-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="keyword">const</span> <span class="identifier">base_type</span> <span class="special">&amp;</span> <a class="link" href="discard_block_engine.html#idp59460088-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#idp59465976-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#idp59390904-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">&lt;</span><span class="keyword">typename</span> It<span class="special">&gt;</span> <span class="keyword">void</span> <a class="link" href="discard_block_engine.html#idp59391672-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#idp59438376-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#idp59438584-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#idp59439384-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#idp59440184-bb">friend functions</a></span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">&gt;</span> 
    <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span> 
    <a class="link" href="discard_block_engine.html#idp59440392-bb"><span class="keyword">operator</span><span class="special">&lt;&lt;</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</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">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">&gt;</span> 
    <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span> 
    <a class="link" href="discard_block_engine.html#idp59443352-bb"><span class="keyword">operator</span><span class="special">&gt;&gt;</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</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">&amp;</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#idp59446232-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">&amp;</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">&amp;</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#idp59448120-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">&amp;</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">&amp;</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="idp191255688"></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 &lt; p &lt;= r </p>
<div class="refsect2">
<a name="idp191258072"></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="idp59464424-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="idp59464728-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">&amp;</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="idp59402376-bb"></a><span class="identifier">discard_block_engine</span><span class="special">(</span><span class="identifier">base_type</span> <span class="special">&amp;&amp;</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="idp59462296-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">&lt;</span><span class="keyword">typename</span> SeedSeq<span class="special">&gt;</span> <span class="keyword">explicit</span> <a name="idp59461176-bb"></a><span class="identifier">discard_block_engine</span><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&amp;</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">&lt;</span><span class="keyword">typename</span> It<span class="special">&gt;</span> <a name="idp59436568-bb"></a><span class="identifier">discard_block_engine</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"><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="idp191282968"></a><h3>
<a name="idp59454872-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="idp59455080-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="idp59455784-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">&lt;</span><span class="keyword">typename</span> SeedSeq<span class="special">&gt;</span> <span class="keyword">void</span> <a name="idp59456824-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&amp;</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">&lt;</span><span class="keyword">typename</span> It<span class="special">&gt;</span> <span class="keyword">void</span> <a name="idp59458280-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>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">&amp;</span> <a name="idp59460088-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="idp59465976-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="idp59390904-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">&lt;</span><span class="keyword">typename</span> It<span class="special">&gt;</span> <span class="keyword">void</span> <a name="idp59391672-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>
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<div class="refsect2">
<a name="idp191311176"></a><h3>
<a name="idp59438376-bb"></a><code class="computeroutput">discard_block_engine</code> public static functions</h3>
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<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">result_type</span> <a name="idp59438584-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="idp59439384-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>
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</ol></div>
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<div class="refsect2">
<a name="idp191317592"></a><h3>
<a name="idp59440184-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">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">&gt;</span> 
  <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span> 
  <a name="idp59440392-bb"></a><span class="keyword">operator</span><span class="special">&lt;&lt;</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</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">&amp;</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>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">&gt;</span> 
  <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span> 
  <a name="idp59443352-bb"></a><span class="keyword">operator</span><span class="special">&gt;&gt;</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</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">&amp;</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>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="idp59446232-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">&amp;</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">&amp;</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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<li class="listitem">
<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="idp59448120-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">&amp;</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">&amp;</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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</ol></div>
</div>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2000-2005 Jens Maurer<br>Copyright &#169; 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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