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  25 <div class="refentry">
  26 <a name="boost.random.xor_combine_engine"></a><div class="titlepage"></div>
  27 <div class="refnamediv">
  28 <h2><span class="refentrytitle">Class template xor_combine_engine</span></h2>
  29 <p>boost::random::xor_combine_engine</p>
  30 </div>
  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <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.xor_combine_hpp" title="Header &lt;boost/random/xor_combine.hpp&gt;">boost/random/xor_combine.hpp</a>&gt;
  33
  34 </span><span class="keyword">template</span><span class="special">&lt;</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">&gt;</span>
  35 <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>
  36 <span class="keyword">public</span><span class="special">:</span>
  37   <span class="comment">// types</span>
  38   <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>
  39   <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>
  40   <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>
  41
  42   <span class="comment">// <a class="link" href="xor_combine_engine.html#boost.random.xor_combine_engineconstruct-copy-destruct">construct/copy/destruct</a></span>
  43   <a class="link" href="xor_combine_engine.html#idp113828336-bb"><span class="identifier">xor_combine_engine</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  44   <a class="link" href="xor_combine_engine.html#idp113829936-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">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">base2_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  45   <span class="keyword">explicit</span> <a class="link" href="xor_combine_engine.html#idp113832480-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>
  46   <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="xor_combine_engine.html#idp202822864-bb"><span class="identifier">xor_combine_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>
  47   <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="xor_combine_engine.html#idp202826720-bb"><span class="identifier">xor_combine_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>
  48
  49   <span class="comment">// <a class="link" href="xor_combine_engine.html#idp199834304-bb">public member functions</a></span>
  50   <span class="keyword">void</span> <a class="link" href="xor_combine_engine.html#idp199834864-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  51   <span class="keyword">void</span> <a class="link" href="xor_combine_engine.html#idp199836592-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>
  52   <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="xor_combine_engine.html#idp199839296-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>
  53   <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="xor_combine_engine.html#idp199842800-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>
  54   <span class="keyword">const</span> <span class="identifier">base1_type</span> <span class="special">&amp;</span> <a class="link" href="xor_combine_engine.html#idp113817856-bb"><span class="identifier">base1</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  55   <span class="keyword">const</span> <span class="identifier">base2_type</span> <span class="special">&amp;</span> <a class="link" href="xor_combine_engine.html#idp113819408-bb"><span class="identifier">base2</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="xor_combine_engine.html#idp113820960-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">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Iter<span class="special">&gt;</span> <span class="keyword">void</span> <a class="link" href="xor_combine_engine.html#idp113822256-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>
  58   <span class="keyword">void</span> <a class="link" href="xor_combine_engine.html#idp113825760-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>
  59
  60   <span class="comment">// <a class="link" href="xor_combine_engine.html#idp202831168-bb">public static functions</a></span>
  61   <span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="xor_combine_engine.html#idp202831728-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="xor_combine_engine.html#idp202833312-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="xor_combine_engine.html#idp105876736-bb">friend functions</a></span>
  65   <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>
  66     <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>
  67     <a class="link" href="xor_combine_engine.html#idp105877296-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>
  68                <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">&amp;</span><span class="special">)</span><span class="special">;</span>
  69   <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>
  70     <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>
  71     <a class="link" href="xor_combine_engine.html#idp105882272-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>
  72                <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">&amp;</span><span class="special">)</span><span class="special">;</span>
  73   <span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="xor_combine_engine.html#idp105887312-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">&amp;</span><span class="special">,</span>
  74                          <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">&amp;</span><span class="special">)</span><span class="special">;</span>
  75   <span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="xor_combine_engine.html#idp105890896-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">&amp;</span><span class="special">,</span>
  76                          <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">&amp;</span><span class="special">)</span><span class="special">;</span>
  77
  78   <span class="comment">// public data members</span>
  79   <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>
  80   <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">shift1</span><span class="special">;</span>
  81   <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">shift2</span><span class="special">;</span>
  82 <span class="special">}</span><span class="special">;</span></pre></div>
  83 <div class="refsect1">
  84 <a name="idp418571040"></a><h2>Description</h2>
  85 <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>
  86 <div class="refsect2">
  87 <a name="idp418574080"></a><h3>
  88 <a name="boost.random.xor_combine_engineconstruct-copy-destruct"></a><code class="computeroutput">xor_combine_engine</code>
  89         public
  90        construct/copy/destruct</h3>
  91 <div class="orderedlist"><ol class="orderedlist" type="1">
  92 <li class="listitem">
  93 <pre class="literallayout"><a name="idp113828336-bb"></a><span class="identifier">xor_combine_engine</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
  94 <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>
  95 </li>
  96 <li class="listitem">
  97 <pre class="literallayout"><a name="idp113829936-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">&amp;</span> rng1<span class="special">,</span> <span class="keyword">const</span> <span class="identifier">base2_type</span> <span class="special">&amp;</span> rng2<span class="special">)</span><span class="special">;</span></pre>
  98 <p>Constructs a <code class="computeroutput">xor_combine</code> by copying two base generators. </p>
  99 </li>
 100 <li class="listitem">
 101 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idp113832480-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>
 102 <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>
 103 <p> </p>
 104 <div class="warning"><table border="0" summary="Warning">
 105 <tr>
 106 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="../../../../doc/src/images/warning.png"></td>
 107 <th align="left">Warning</th>
 108 </tr>
 109 <tr><td align="left" valign="top"><p>  The exact algorithm used by this function may change in the future.  </p></td></tr>
 110 </table></div>
 111 <p>  </p>
 112 </li>
 113 <li class="listitem">
 114 <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="idp202822864-bb"></a><span class="identifier">xor_combine_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>
 115 <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>
 116 </li>
 117 <li class="listitem">
 118 <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="idp202826720-bb"></a><span class="identifier">xor_combine_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>
 119 <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>
 120 </li>
 121 </ol></div>
 122 </div>
 123 <div class="refsect2">
 124 <a name="idp418622224"></a><h3>
 125 <a name="idp199834304-bb"></a><code class="computeroutput">xor_combine_engine</code> public member functions</h3>
 126 <div class="orderedlist"><ol class="orderedlist" type="1">
 127 <li class="listitem">
 128 <pre class="literallayout"><span class="keyword">void</span> <a name="idp199834864-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 129 <p>Calls <code class="computeroutput">seed()</code> for both base generators. </p>
 130 </li>
 131 <li class="listitem">
 132 <pre class="literallayout"><span class="keyword">void</span> <a name="idp199836592-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>
 133 <p><code class="computeroutput">seeds</code> both base generators with <code class="computeroutput">v</code>. </p>
 134 </li>
 135 <li class="listitem">
 136 <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="idp199839296-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>
 137 <p><code class="computeroutput">seeds</code> both base generators with values produced by <code class="computeroutput">seq</code>. </p>
 138 </li>
 139 <li class="listitem">
 140 <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="idp199842800-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>
 141 <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>
 142 </li>
 143 <li class="listitem">
 144 <pre class="literallayout"><span class="keyword">const</span> <span class="identifier">base1_type</span> <span class="special">&amp;</span> <a name="idp113817856-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>
 145 <p>Returns the first base generator. </p>
 146 </li>
 147 <li class="listitem">
 148 <pre class="literallayout"><span class="keyword">const</span> <span class="identifier">base2_type</span> <span class="special">&amp;</span> <a name="idp113819408-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>
 149 <p>Returns the second base generator. </p>
 150 </li>
 151 <li class="listitem">
 152 <pre class="literallayout"><span class="identifier">result_type</span> <a name="idp113820960-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>
 153 <p>Returns the next value of the generator. </p>
 154 </li>
 155 <li class="listitem">
 156 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Iter<span class="special">&gt;</span> <span class="keyword">void</span> <a name="idp113822256-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>
 157 <p>Fills a range with random values </p>
 158 </li>
 159 <li class="listitem">
 160 <pre class="literallayout"><span class="keyword">void</span> <a name="idp113825760-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>
 161 <p>Advances the state of the generator by <code class="computeroutput">z</code>. </p>
 162 </li>
 163 </ol></div>
 164 </div>
 165 <div class="refsect2">
 166 <a name="idp418691968"></a><h3>
 167 <a name="idp202831168-bb"></a><code class="computeroutput">xor_combine_engine</code> public static functions</h3>
 168 <div class="orderedlist"><ol class="orderedlist" type="1">
 169 <li class="listitem">
 170 <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">result_type</span> <a name="idp202831728-bb"></a><span class="identifier">min</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 171 <p>Returns the smallest value that the generator can produce. </p>
 172 </li>
 173 <li class="listitem">
 174 <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">result_type</span> <a name="idp202833312-bb"></a><span class="identifier">max</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 175 <p>Returns the largest value that the generator can produce. </p>
 176 </li>
 177 </ol></div>
 178 </div>
 179 <div class="refsect2">
 180 <a name="idp418704816"></a><h3>
 181 <a name="idp105876736-bb"></a><code class="computeroutput">xor_combine_engine</code> friend functions</h3>
 182 <div class="orderedlist"><ol class="orderedlist" type="1">
 183 <li class="listitem">
 184 <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>
 185   <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>
 186   <a name="idp105877296-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>
 187              <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">&amp;</span> s<span class="special">)</span><span class="special">;</span></pre>
 188 <p>Writes the textual representation of the generator to a <code class="computeroutput">std::ostream</code>. </p>
 189 </li>
 190 <li class="listitem">
 191 <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>
 192   <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>
 193   <a name="idp105882272-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>
 194              <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">&amp;</span> s<span class="special">)</span><span class="special">;</span></pre>
 195 <p>Reads the textual representation of the generator from a <code class="computeroutput">std::istream</code>. </p>
 196 </li>
 197 <li class="listitem">
 198 <pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="idp105887312-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">&amp;</span> x<span class="special">,</span>
 199                        <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">&amp;</span> y<span class="special">)</span><span class="special">;</span></pre>
 200 <p>Returns true if the two generators will produce identical sequences. </p>
 201 </li>
 202 <li class="listitem">
 203 <pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="idp105890896-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">&amp;</span> lhs<span class="special">,</span>
 204                        <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">&amp;</span> rhs<span class="special">)</span><span class="special">;</span></pre>
 205 <p>Returns true if the two generators will produce different sequences. </p>
 206 </li>
 207 </ol></div>
 208 </div>
 209 </div>
 210 </div>
 211 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 212 <td align="left"></td>
 213 <td align="right"><div class="copyright-footer">Copyright &#169; 2000-2005 Jens Maurer<br>Copyright &#169; 2009, 2010 Steven Watanabe<p>
 214         Distributed under the Boost Software License, Version 1.0. (See accompanying
 215         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>)
 216       </p>
 217 </div></td>
 218 </tr></table>
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