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25</div> 26<div class="refentry"> 27<a name="boost.random.rand48"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Class rand48</span></h2> 30<p>boost::random::rand48</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.linear_congruential_hpp" title="Header <boost/random/linear_congruential.hpp>">boost/random/linear_congruential.hpp</a>> 34 35</span> 36<span class="keyword">class</span> <a class="link" href="rand48.html" title="Class rand48">rand48</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">boost</span><span class="special">::</span><span class="identifier">uint32_t</span> <a name="boost.random.rand48.result_type"></a><span class="identifier">result_type</span><span class="special">;</span> 40 41 <span class="comment">// <a class="link" href="rand48.html#boost.random.rand48construct-copy-destruct">construct/copy/destruct</a></span> 42 <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_6-bb"><span class="identifier">rand48</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 43 <span class="keyword">explicit</span> <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_7-bb"><span class="identifier">rand48</span></a><span class="special">(</span><span class="identifier">result_type</span><span class="special">)</span><span class="special">;</span> 44 <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="rand48.html#id-1_3_34_5_6_23_1_1_2_8-bb"><span class="identifier">rand48</span></a><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 45 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_9-bb"><span class="identifier">rand48</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> 46 47 <span class="comment">// <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_4-bb">public static functions</a></span> 48 <span class="keyword">static</span> <span class="identifier">uint32_t</span> <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_4_1-bb"><span class="identifier">min</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 49 <span class="keyword">static</span> <span class="identifier">uint32_t</span> <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_4_2-bb"><span class="identifier">max</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 50 51 <span class="comment">// <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_5-bb">public member functions</a></span> 52 <span class="keyword">void</span> <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_5_1-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 53 <span class="keyword">void</span> <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_5_2-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> 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="rand48.html#id-1_3_34_5_6_23_1_1_2_5_3-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">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="rand48.html#id-1_3_34_5_6_23_1_1_2_5_4-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> 56 <span class="identifier">uint32_t</span> <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_5_5-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="rand48.html#id-1_3_34_5_6_23_1_1_2_5_6-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> Iter<span class="special">></span> <span class="keyword">void</span> <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_5_7-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> 59 60 <span class="comment">// <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_10-bb">friend functions</a></span> 61 <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> 62 <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> 63 <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_10_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> <span class="keyword">const</span> <a class="link" href="rand48.html" title="Class rand48">rand48</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 64 <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> 65 <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> 66 <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_10_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="rand48.html" title="Class rand48">rand48</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 67 <span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_10_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="rand48.html" title="Class rand48">rand48</a> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="rand48.html" title="Class rand48">rand48</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 68 <span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="rand48.html#id-1_3_34_5_6_23_1_1_2_10_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="rand48.html" title="Class rand48">rand48</a> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="rand48.html" title="Class rand48">rand48</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 69 70 <span class="comment">// public data members</span> 71 <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> 72<span class="special">}</span><span class="special">;</span></pre></div> 73<div class="refsect1"> 74<a name="id-1.3.34.5.6.22.4.4"></a><h2>Description</h2> 75<p>Class <code class="computeroutput"><a class="link" href="rand48.html" title="Class rand48">rand48</a></code> models 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> . It uses the linear congruential algorithm with the parameters a = 0x5DEECE66D, c = 0xB, m = 2**48. It delivers identical results to the <code class="computeroutput">lrand48()</code> function available on some systems (assuming lcong48 has not been called).</p> 76<p>It is only available on systems where <code class="computeroutput">uint64_t</code> is provided as an integral type, so that for example static in-class constants and/or enum definitions with large <code class="computeroutput">uint64_t</code> numbers work. </p> 77<div class="refsect2"> 78<a name="id-1.3.34.5.6.22.4.4.4"></a><h3> 79<a name="boost.random.rand48construct-copy-destruct"></a><code class="computeroutput">rand48</code> 80 public 81 construct/copy/destruct</h3> 82<div class="orderedlist"><ol class="orderedlist" type="1"> 83<li class="listitem"> 84<pre class="literallayout"><a name="id-1_3_34_5_6_23_1_1_2_6-bb"></a><span class="identifier">rand48</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> 85<p>Seeds the generator with the default seed. </p> 86</li> 87<li class="listitem"> 88<pre class="literallayout"><span class="keyword">explicit</span> <a name="id-1_3_34_5_6_23_1_1_2_7-bb"></a><span class="identifier">rand48</span><span class="special">(</span><span class="identifier">result_type</span> x0<span class="special">)</span><span class="special">;</span></pre> 89<p>Constructs a <code class="computeroutput"><a class="link" href="rand48.html" title="Class rand48">rand48</a></code> generator with x(0) := (x0 << 16) | 0x330e. </p> 90</li> 91<li class="listitem"> 92<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_23_1_1_2_8-bb"></a><span class="identifier">rand48</span><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span> seq<span class="special">)</span><span class="special">;</span></pre> 93<p>Seeds the generator with values produced by <code class="computeroutput">seq.generate()</code>. </p> 94</li> 95<li class="listitem"> 96<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_23_1_1_2_9-bb"></a><span class="identifier">rand48</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> 97<p>Seeds the generator using values from an iterator range, and updates first to point one past the last value consumed. </p> 98</li> 99</ol></div> 100</div> 101<div class="refsect2"> 102<a name="id-1.3.34.5.6.22.4.4.5"></a><h3> 103<a name="id-1_3_34_5_6_23_1_1_2_4-bb"></a><code class="computeroutput">rand48</code> public static functions</h3> 104<div class="orderedlist"><ol class="orderedlist" type="1"> 105<li class="listitem"> 106<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">uint32_t</span> <a name="id-1_3_34_5_6_23_1_1_2_4_1-bb"></a><span class="identifier">min</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> 107<p>Returns the smallest value that the generator can produce </p> 108</li> 109<li class="listitem"> 110<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">uint32_t</span> <a name="id-1_3_34_5_6_23_1_1_2_4_2-bb"></a><span class="identifier">max</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> 111<p>Returns the largest value that the generator can produce </p> 112</li> 113</ol></div> 114</div> 115<div class="refsect2"> 116<a name="id-1.3.34.5.6.22.4.4.6"></a><h3> 117<a name="id-1_3_34_5_6_23_1_1_2_5-bb"></a><code class="computeroutput">rand48</code> public member functions</h3> 118<div class="orderedlist"><ol class="orderedlist" type="1"> 119<li class="listitem"> 120<pre class="literallayout"><span class="keyword">void</span> <a name="id-1_3_34_5_6_23_1_1_2_5_1-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> 121<p>Seeds the generator with the default seed. </p> 122</li> 123<li class="listitem"> 124<pre class="literallayout"><span class="keyword">void</span> <a name="id-1_3_34_5_6_23_1_1_2_5_2-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">result_type</span> x0<span class="special">)</span><span class="special">;</span></pre> 125<p>Changes the current value x(n) of the generator to (x0 << 16) | 0x330e. </p> 126</li> 127<li class="listitem"> 128<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_23_1_1_2_5_3-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> 129<p>Seeds the generator using values from an iterator range, and updates first to point one past the last value consumed. </p> 130</li> 131<li class="listitem"> 132<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_23_1_1_2_5_4-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> 133<p>Seeds the generator with values produced by <code class="computeroutput">seq.generate()</code>. </p> 134</li> 135<li class="listitem"> 136<pre class="literallayout"><span class="identifier">uint32_t</span> <a name="id-1_3_34_5_6_23_1_1_2_5_5-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> 137<p>Returns the next value of the generator. </p> 138</li> 139<li class="listitem"> 140<pre class="literallayout"><span class="keyword">void</span> <a name="id-1_3_34_5_6_23_1_1_2_5_6-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> 141<p>Advances the state of the generator by <code class="computeroutput">z</code>. </p> 142</li> 143<li class="listitem"> 144<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="id-1_3_34_5_6_23_1_1_2_5_7-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> 145<p>Fills a range with random values </p> 146</li> 147</ol></div> 148</div> 149<div class="refsect2"> 150<a name="id-1.3.34.5.6.22.4.4.7"></a><h3> 151<a name="id-1_3_34_5_6_23_1_1_2_10-bb"></a><code class="computeroutput">rand48</code> friend functions</h3> 152<div class="orderedlist"><ol class="orderedlist" type="1"> 153<li class="listitem"> 154<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> 155 <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> 156 <a name="id-1_3_34_5_6_23_1_1_2_10_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> <span class="keyword">const</span> <a class="link" href="rand48.html" title="Class rand48">rand48</a> <span class="special">&</span> r<span class="special">)</span><span class="special">;</span></pre> 157<p>Writes a <code class="computeroutput"><code class="computeroutput"><a class="link" href="rand48.html" title="Class rand48">rand48</a></code></code> to a <code class="computeroutput">std::ostream</code>. </p> 158</li> 159<li class="listitem"> 160<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> 161 <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> 162 <a name="id-1_3_34_5_6_23_1_1_2_10_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> <a class="link" href="rand48.html" title="Class rand48">rand48</a> <span class="special">&</span> r<span class="special">)</span><span class="special">;</span></pre> 163<p>Reads a <code class="computeroutput"><code class="computeroutput"><a class="link" href="rand48.html" title="Class rand48">rand48</a></code></code> from a <code class="computeroutput">std::istream</code>. </p> 164</li> 165<li class="listitem"> 166<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="id-1_3_34_5_6_23_1_1_2_10_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="rand48.html" title="Class rand48">rand48</a> <span class="special">&</span> x<span class="special">,</span> <span class="keyword">const</span> <a class="link" href="rand48.html" title="Class rand48">rand48</a> <span class="special">&</span> y<span class="special">)</span><span class="special">;</span></pre> 167<p>Returns true if the two generators will produce identical sequences of values. </p> 168</li> 169<li class="listitem"> 170<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="id-1_3_34_5_6_23_1_1_2_10_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="rand48.html" title="Class rand48">rand48</a> <span class="special">&</span> x<span class="special">,</span> <span class="keyword">const</span> <a class="link" href="rand48.html" title="Class rand48">rand48</a> <span class="special">&</span> y<span class="special">)</span><span class="special">;</span></pre> 171<p>Returns true if the two generators will produce different sequences of values. </p> 172</li> 173</ol></div> 174</div> 175</div> 176</div> 177<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 178<td align="left"></td> 179<td align="right"><div class="copyright-footer">Copyright © 2000-2005 Jens Maurer<br>Copyright © 2009, 2010 Steven Watanabe<p> 180 Distributed under the Boost Software License, Version 1.0. (See accompanying 181 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>) 182 </p> 183</div></td> 184</tr></table> 185<hr> 186<div class="spirit-nav"> 187<a accesskey="p" href="linear_congruential_engine.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_random/reference.html#header.boost.random.linear_congruential_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="minstd_rand0.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 188</div> 189</body> 190</html> 191
