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src="../../../../doc/src/images/next.png" alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="boost.random.discard_block_engine"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Class template discard_block_engine</span></h2> 30<p>boost::random::discard_block_engine</p> 31</div> 32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 33<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>> 34 35</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> 36<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> 37<span class="keyword">public</span><span class="special">:</span> 38 <span class="comment">// types</span> 39 <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> 40 <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> 41 42 <span class="comment">// <a class="link" href="discard_block_engine.html#boost.random.discard_block_engineconstruct-copy-destruct">construct/copy/destruct</a></span> 43 <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_11-bb"><span class="identifier">discard_block_engine</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 44 <span class="keyword">explicit</span> <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_12-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> 45 <span class="keyword">explicit</span> <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_13-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> 46 <span class="keyword">explicit</span> <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_14-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> 47 <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#id-1_3_34_5_6_9_1_1_1_15-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> 48 <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#id-1_3_34_5_6_9_1_1_1_16-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> 49 50 <span class="comment">// <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_10-bb">public member functions</a></span> 51 <span class="keyword">void</span> <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_10_1-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 52 <span class="keyword">void</span> <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_10_2-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> 53 <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#id-1_3_34_5_6_9_1_1_1_10_3-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> 54 <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#id-1_3_34_5_6_9_1_1_1_10_4-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> 55 <span class="keyword">const</span> <span class="identifier">base_type</span> <span class="special">&</span> <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_10_5-bb"><span class="identifier">base</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 56 <span class="identifier">result_type</span> <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_10_6-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> 57 <span class="keyword">void</span> <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_10_7-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> 58 <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#id-1_3_34_5_6_9_1_1_1_10_8-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> 59 60 <span class="comment">// <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_17-bb">public static functions</a></span> 61 <span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_17_1-bb"><span class="identifier">min</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 62 <span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_17_2-bb"><span class="identifier">max</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 63 64 <span class="comment">// <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_18-bb">friend functions</a></span> 65 <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> 66 <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> 67 <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_18_1-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> 68 <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> 69 <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> 70 <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> 71 <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_18_2-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> 72 <span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_18_3-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> 73 <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> 74 <span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="discard_block_engine.html#id-1_3_34_5_6_9_1_1_1_18_4-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> 75 <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> 76 77 <span class="comment">// public data members</span> 78 <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> 79 <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> 80 <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> 81 <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> 82 <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> 83<span class="special">}</span><span class="special">;</span></pre></div> 84<div class="refsect1"> 85<a name="id-1.3.34.5.6.8.3.4"></a><h2>Description</h2> 86<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> 87<p>Requires: 0 < p <= r </p> 88<div class="refsect2"> 89<a name="id-1.3.34.5.6.8.3.4.4"></a><h3> 90<a name="boost.random.discard_block_engineconstruct-copy-destruct"></a><code class="computeroutput">discard_block_engine</code> 91 public 92 construct/copy/destruct</h3> 93<div class="orderedlist"><ol class="orderedlist" type="1"> 94<li class="listitem"> 95<pre class="literallayout"><a name="id-1_3_34_5_6_9_1_1_1_11-bb"></a><span class="identifier">discard_block_engine</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> 96<p>Uses the default seed for the base generator. </p> 97</li> 98<li class="listitem"> 99<pre class="literallayout"><span class="keyword">explicit</span> <a name="id-1_3_34_5_6_9_1_1_1_12-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> 100<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> 101</li> 102<li class="listitem"> 103<pre class="literallayout"><span class="keyword">explicit</span> <a name="id-1_3_34_5_6_9_1_1_1_13-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> 104<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> 105</li> 106<li class="listitem"> 107<pre class="literallayout"><span class="keyword">explicit</span> <a name="id-1_3_34_5_6_9_1_1_1_14-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> 108<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> 109</li> 110<li class="listitem"> 111<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="id-1_3_34_5_6_9_1_1_1_15-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> 112<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> 113</li> 114<li class="listitem"> 115<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <a name="id-1_3_34_5_6_9_1_1_1_16-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> 116<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> 117</li> 118</ol></div> 119</div> 120<div class="refsect2"> 121<a name="id-1.3.34.5.6.8.3.4.5"></a><h3> 122<a name="id-1_3_34_5_6_9_1_1_1_10-bb"></a><code class="computeroutput">discard_block_engine</code> public member functions</h3> 123<div class="orderedlist"><ol class="orderedlist" type="1"> 124<li class="listitem"> 125<pre class="literallayout"><span class="keyword">void</span> <a name="id-1_3_34_5_6_9_1_1_1_10_1-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> 126<p>default seeds the underlying generator. </p> 127</li> 128<li class="listitem"> 129<pre class="literallayout"><span class="keyword">void</span> <a name="id-1_3_34_5_6_9_1_1_1_10_2-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> 130<p>Seeds the underlying generator with s. </p> 131</li> 132<li class="listitem"> 133<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="id-1_3_34_5_6_9_1_1_1_10_3-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> 134<p>Seeds the underlying generator with seq. </p> 135</li> 136<li class="listitem"> 137<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="id-1_3_34_5_6_9_1_1_1_10_4-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> 138<p>Seeds the underlying generator with first and last. </p> 139</li> 140<li class="listitem"> 141<pre class="literallayout"><span class="keyword">const</span> <span class="identifier">base_type</span> <span class="special">&</span> <a name="id-1_3_34_5_6_9_1_1_1_10_5-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> 142<p>Returns the underlying engine. </p> 143</li> 144<li class="listitem"> 145<pre class="literallayout"><span class="identifier">result_type</span> <a name="id-1_3_34_5_6_9_1_1_1_10_6-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> 146<p>Returns the next value of the generator. </p> 147</li> 148<li class="listitem"><pre class="literallayout"><span class="keyword">void</span> <a name="id-1_3_34_5_6_9_1_1_1_10_7-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> 149<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="id-1_3_34_5_6_9_1_1_1_10_8-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> 150</ol></div> 151</div> 152<div class="refsect2"> 153<a name="id-1.3.34.5.6.8.3.4.6"></a><h3> 154<a name="id-1_3_34_5_6_9_1_1_1_17-bb"></a><code class="computeroutput">discard_block_engine</code> public static functions</h3> 155<div class="orderedlist"><ol class="orderedlist" type="1"> 156<li class="listitem"> 157<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">result_type</span> <a name="id-1_3_34_5_6_9_1_1_1_17_1-bb"></a><span class="identifier">min</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> 158<p>Returns the smallest value that the generator can produce. This is the same as the minimum of the underlying generator. </p> 159</li> 160<li class="listitem"> 161<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">result_type</span> <a name="id-1_3_34_5_6_9_1_1_1_17_2-bb"></a><span class="identifier">max</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> 162<p>Returns the largest value that the generator can produce. This is the same as the maximum of the underlying generator. </p> 163</li> 164</ol></div> 165</div> 166<div class="refsect2"> 167<a name="id-1.3.34.5.6.8.3.4.7"></a><h3> 168<a name="id-1_3_34_5_6_9_1_1_1_18-bb"></a><code class="computeroutput">discard_block_engine</code> friend functions</h3> 169<div class="orderedlist"><ol class="orderedlist" type="1"> 170<li class="listitem"> 171<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> 172 <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> 173 <a name="id-1_3_34_5_6_9_1_1_1_18_1-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> 174 <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> 175<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> 176</li> 177<li class="listitem"> 178<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> 179 <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> 180 <a name="id-1_3_34_5_6_9_1_1_1_18_2-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> 181 <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> 182<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> 183</li> 184<li class="listitem"> 185<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="id-1_3_34_5_6_9_1_1_1_18_3-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> 186 <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> 187<p>Returns true if the two generators will produce identical sequences. </p> 188</li> 189<li class="listitem"> 190<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="id-1_3_34_5_6_9_1_1_1_18_4-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> 191 <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> 192<p>Returns true if the two generators will produce different sequences. </p> 193</li> 194</ol></div> 195</div> 196</div> 197</div> 198<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 199<td align="left"></td> 200<td align="right"><div class="copyright-footer">Copyright © 2000-2005 Jens Maurer<br>Copyright © 2009, 2010 Steven Watanabe<p> 201 Distributed under the Boost Software License, Version 1.0. (See accompanying 202 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>) 203 </p> 204</div></td> 205</tr></table> 206<hr> 207<div class="spirit-nav"> 208<a accesskey="p" href="chi_squared_distribution/param_type.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_random/reference.html#header.boost.random.discard_block_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="discrete_distribution.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 209</div> 210</body> 211</html> 212
