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<title>Class template xor_combine_engine</title>
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<div class="refentry">
<a name="boost.random.xor_combine_engine"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template xor_combine_engine</span></h2>
<p>boost::random::xor_combine_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.xor_combine_hpp" title="Header <boost/random/xor_combine.hpp>">boost/random/xor_combine.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> URNG1<span class="special">,</span> <span class="keyword">int</span> s1<span class="special">,</span> <span class="keyword">typename</span> URNG2<span class="special">,</span> <span class="keyword">int</span> s2<span class="special">></span>
<span class="keyword">class</span> <a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_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">URNG1</span> <a name="boost.random.xor_combine_engine.base1_type"></a><span class="identifier">base1_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">URNG2</span> <a name="boost.random.xor_combine_engine.base2_type"></a><span class="identifier">base2_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">base1_type</span><span class="special">::</span><span class="identifier">result_type</span> <a name="boost.random.xor_combine_engine.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
<span class="comment">// <a class="link" href="xor_combine_engine.html#boost.random.xor_combine_engineconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="xor_combine_engine.html#id1276298-bb"><span class="identifier">xor_combine_engine</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="xor_combine_engine.html#id1276311-bb"><span class="identifier">xor_combine_engine</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">base1_type</span> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">base2_type</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">explicit</span> <a class="link" href="xor_combine_engine.html#id1276331-bb"><span class="identifier">xor_combine_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="xor_combine_engine.html#id1276364-bb"><span class="identifier">xor_combine_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="xor_combine_engine.html#id1276395-bb"><span class="identifier">xor_combine_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="xor_combine_engine.html#id1276102-bb">public member functions</a></span>
<span class="keyword">void</span> <a class="link" href="xor_combine_engine.html#id1276105-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="xor_combine_engine.html#id1276121-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="xor_combine_engine.html#id1276144-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="xor_combine_engine.html#id1276174-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">base1_type</span> <span class="special">&</span> <a class="link" href="xor_combine_engine.html#id1276211-bb"><span class="identifier">base1</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">const</span> <span class="identifier">base2_type</span> <span class="special">&</span> <a class="link" href="xor_combine_engine.html#id1276223-bb"><span class="identifier">base2</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="xor_combine_engine.html#id1276235-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Iter<span class="special">></span> <span class="keyword">void</span> <a class="link" href="xor_combine_engine.html#id1276247-bb"><span class="identifier">generate</span></a><span class="special">(</span><span class="identifier">Iter</span><span class="special">,</span> <span class="identifier">Iter</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="xor_combine_engine.html#id1276277-bb"><span class="identifier">discard</span></a><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uintmax_t</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="xor_combine_engine.html#id1276433-bb">public static functions</a></span>
<span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="xor_combine_engine.html#id1276437-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="xor_combine_engine.html#id1276449-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="xor_combine_engine.html#id1276461-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="xor_combine_engine.html#id1276465-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="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_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="xor_combine_engine.html#id1276508-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="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_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="xor_combine_engine.html#id1276552-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_engine</a> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_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="xor_combine_engine.html#id1276583-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_engine</a> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_engine</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// public data members</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</span> <span class="identifier">has_fixed_range</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">shift1</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">shift2</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id3091528"></a><h2>Description</h2>
<p>Instantiations of <code class="computeroutput"><a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_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> . To produce its output it invokes each of the base generators, shifts their results and xors them together. </p>
<div class="refsect2">
<a name="id3091556"></a><h3>
<a name="boost.random.xor_combine_engineconstruct-copy-destruct"></a><code class="computeroutput">xor_combine_engine</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="id1276298-bb"></a><span class="identifier">xor_combine_engine</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Constructors a <code class="computeroutput"><code class="computeroutput"><a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_engine</a></code></code> by default constructing both base generators. </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="id1276311-bb"></a><span class="identifier">xor_combine_engine</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">base1_type</span> <span class="special">&</span> rng1<span class="special">,</span> <span class="keyword">const</span> <span class="identifier">base2_type</span> <span class="special">&</span> rng2<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a <code class="computeroutput">xor_combine</code> by copying two base generators. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="id1276331-bb"></a><span class="identifier">xor_combine_engine</span><span class="special">(</span><span class="identifier">result_type</span> v<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a <code class="computeroutput"><code class="computeroutput"><a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_engine</a></code></code>, seeding both base generators with <code class="computeroutput">v</code>.</p>
<p> </p>
<div class="warning"><table border="0" summary="Warning">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="../../../../doc/src/images/warning.png"></td>
<th align="left">Warning</th>
</tr>
<tr><td align="left" valign="top"><p> The exact algorithm used by this function may change in the future. </p></td></tr>
</table></div>
<p> </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="id1276364-bb"></a><span class="identifier">xor_combine_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>Constructs a <code class="computeroutput"><code class="computeroutput"><a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_engine</a></code></code>, seeding both base generators with values produced by <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="id1276395-bb"></a><span class="identifier">xor_combine_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>Constructs a <code class="computeroutput"><code class="computeroutput"><a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_engine</a></code></code>, seeding both base generators with values from the iterator range [first, last) and changes first to point to the element after the last one used. If there are not enough elements in the range to seed both generators, throws <code class="computeroutput">std::invalid_argument</code>. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id3091958"></a><h3>
<a name="id1276102-bb"></a><code class="computeroutput">xor_combine_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="id1276105-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Calls <code class="computeroutput">seed()</code> for both base generators. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="id1276121-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">result_type</span> v<span class="special">)</span><span class="special">;</span></pre>
<p><code class="computeroutput">seeds</code> both base generators with <code class="computeroutput">v</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">void</span> <a name="id1276144-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><code class="computeroutput">seeds</code> both base generators with values produced by <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> <span class="keyword">void</span> <a name="id1276174-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 both base generators with values from the iterator range [first, last) and changes first to point to the element after the last one used. If there are not enough elements in the range to seed both generators, throws <code class="computeroutput">std::invalid_argument</code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">const</span> <span class="identifier">base1_type</span> <span class="special">&</span> <a name="id1276211-bb"></a><span class="identifier">base1</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns the first base generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">const</span> <span class="identifier">base2_type</span> <span class="special">&</span> <a name="id1276223-bb"></a><span class="identifier">base2</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns the second base generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">result_type</span> <a name="id1276235-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Returns the next value of the generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Iter<span class="special">></span> <span class="keyword">void</span> <a name="id1276247-bb"></a><span class="identifier">generate</span><span class="special">(</span><span class="identifier">Iter</span> first<span class="special">,</span> <span class="identifier">Iter</span> last<span class="special">)</span><span class="special">;</span></pre>
<p>Fills a range with random values </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="id1276277-bb"></a><span class="identifier">discard</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uintmax_t</span> z<span class="special">)</span><span class="special">;</span></pre>
<p>Advances the state of the generator by <code class="computeroutput">z</code>. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id3092529"></a><h3>
<a name="id1276433-bb"></a><code class="computeroutput">xor_combine_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="id1276437-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>
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<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">result_type</span> <a name="id1276449-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>
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<a name="id3092634"></a><h3>
<a name="id1276461-bb"></a><code class="computeroutput">xor_combine_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="id1276465-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="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_engine</a> <span class="special">&</span> s<span class="special">)</span><span class="special">;</span></pre>
<p>Writes the textual representation of the generator to a <code class="computeroutput">std::ostream</code>. </p>
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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="id1276508-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="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_engine</a> <span class="special">&</span> s<span class="special">)</span><span class="special">;</span></pre>
<p>Reads the textual representation of the generator from a <code class="computeroutput">std::istream</code>. </p>
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<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="id1276552-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_engine</a> <span class="special">&</span> x<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_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="id1276583-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_engine</a> <span class="special">&</span> lhs<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="xor_combine_engine.html" title="Class template xor_combine_engine">xor_combine_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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<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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