boost-react-native-bundle

<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Class rand48</title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../boost_random/reference.html#header.boost.random.linear_congruential_hpp" title="Header <boost/random/linear_congruential.hpp>"> <link rel="prev" href="linear_congruential_engine.html" title="Class template linear_congruential_engine"> <link rel="next" href="minstd_rand0.html" title="Type definition minstd_rand0"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> <td align="center"><a href="../../../../index.html">Home</a></td> <td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <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> </div> <div class="refentry"> <a name="boost.random.rand48"></a><div class="titlepage"></div> <div class="refnamediv"> <h2>Class rand48</h2> boost::random::rand48 </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">// 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>> class <a class="link" href="rand48.html" title="Class rand48">rand48</a> { public: // types typedef boost::uint32_t <a name="boost.random.rand48.result_type"></a>result_type; // <a class="link" href="rand48.html#boost.random.rand48construct-copy-destruct">construct/copy/destruct</a> <a class="link" href="rand48.html#idp208319296-bb">rand48</a>(); explicit <a class="link" href="rand48.html#idp208316752-bb">rand48</a>(result_type); template<typename SeedSeq> explicit <a class="link" href="rand48.html#idp208316144-bb">rand48</a>(SeedSeq &); template<typename It> <a class="link" href="rand48.html#idp208313024-bb">rand48</a>(It &, It); // <a class="link" href="rand48.html#idp155251392-bb">public static functions</a> static uint32_t <a class="link" href="rand48.html#idp155251888-bb">min</a>(); static uint32_t <a class="link" href="rand48.html#idp104248848-bb">max</a>(); // <a class="link" href="rand48.html#idp104248096-bb">public member functions</a> void <a class="link" href="rand48.html#idp104248512-bb">seed</a>(); void <a class="link" href="rand48.html#idp156405392-bb">seed</a>(result_type); template<typename It> void <a class="link" href="rand48.html#idp156403776-bb">seed</a>(It &, It); template<typename SeedSeq> void <a class="link" href="rand48.html#idp156398256-bb">seed</a>(SeedSeq &); uint32_t <a class="link" href="rand48.html#idp99644560-bb">operator()</a>(); void <a class="link" href="rand48.html#idp99642992-bb">discard</a>(boost::uintmax_t); template<typename Iter> void <a class="link" href="rand48.html#idp99641152-bb">generate</a>(Iter, Iter); // <a class="link" href="rand48.html#idp153623488-bb">friend functions</a> template<typename CharT, typename Traits> friend std::basic_ostream< CharT, Traits > & <a class="link" href="rand48.html#idp153620864-bb">operator<<</a>(std::basic_ostream< CharT, Traits > &, const <a class="link" href="rand48.html" title="Class rand48">rand48</a> &); template<typename CharT, typename Traits> friend std::basic_istream< CharT, Traits > & <a class="link" href="rand48.html#idp100210032-bb">operator>></a>(std::basic_istream< CharT, Traits > &, <a class="link" href="rand48.html" title="Class rand48">rand48</a> &); friend bool <a class="link" href="rand48.html#idp100206240-bb">operator==</a>(const <a class="link" href="rand48.html" title="Class rand48">rand48</a> &, const <a class="link" href="rand48.html" title="Class rand48">rand48</a> &); friend bool <a class="link" href="rand48.html#idp158870704-bb">operator!=</a>(const <a class="link" href="rand48.html" title="Class rand48">rand48</a> &, const <a class="link" href="rand48.html" title="Class rand48">rand48</a> &); // public data members static const bool has_fixed_range; };</pre></div> <div class="refsect1"> <a name="idp406227584"></a><h2>Description</h2> 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). 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. <div class="refsect2"> <a name="idp406233296"></a><h3> <a name="boost.random.rand48construct-copy-destruct"></a><code class="computeroutput">rand48</code> public construct/copy/destruct</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout"><a name="idp208319296-bb"></a>rand48();</pre> Seeds the generator with the default seed. </li> <li class="listitem"> <pre class="literallayout">explicit <a name="idp208316752-bb"></a>rand48(result_type x0);</pre> Constructs a <code class="computeroutput"><a class="link" href="rand48.html" title="Class rand48">rand48</a></code> generator with x(0) := (x0 << 16) | 0x330e. </li> <li class="listitem"> <pre class="literallayout">template<typename SeedSeq> explicit <a name="idp208316144-bb"></a>rand48(SeedSeq & seq);</pre> Seeds the generator with values produced by <code class="computeroutput">seq.generate()</code>. </li> <li class="listitem"> <pre class="literallayout">template<typename It> <a name="idp208313024-bb"></a>rand48(It & first, It last);</pre> Seeds the generator using values from an iterator range, and updates first to point one past the last value consumed. </li> </ol></div> </div> <div class="refsect2"> <a name="idp406264560"></a><h3> <a name="idp155251392-bb"></a><code class="computeroutput">rand48</code> public static functions</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout">static uint32_t <a name="idp155251888-bb"></a>min();</pre> Returns the smallest value that the generator can produce </li> <li class="listitem"> <pre class="literallayout">static uint32_t <a name="idp104248848-bb"></a>max();</pre> Returns the largest value that the generator can produce </li> </ol></div> </div> <div class="refsect2"> <a name="idp406277328"></a><h3> <a name="idp104248096-bb"></a><code class="computeroutput">rand48</code> public member functions</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout">void <a name="idp104248512-bb"></a>seed();</pre> Seeds the generator with the default seed. </li> <li class="listitem"> <pre class="literallayout">void <a name="idp156405392-bb"></a>seed(result_type x0);</pre> Changes the current value x(n) of the generator to (x0 << 16) | 0x330e. </li> <li class="listitem"> <pre class="literallayout">template<typename It> void <a name="idp156403776-bb"></a>seed(It & first, It last);</pre> Seeds the generator using values from an iterator range, and updates first to point one past the last value consumed. </li> <li class="listitem"> <pre class="literallayout">template<typename SeedSeq> void <a name="idp156398256-bb"></a>seed(SeedSeq & seq);</pre> Seeds the generator with values produced by <code class="computeroutput">seq.generate()</code>. </li> <li class="listitem"> <pre class="literallayout">uint32_t <a name="idp99644560-bb"></a>operator()();</pre> Returns the next value of the generator. </li> <li class="listitem"> <pre class="literallayout">void <a name="idp99642992-bb"></a>discard(boost::uintmax_t z);</pre> Advances the state of the generator by <code class="computeroutput">z</code>. </li> <li class="listitem"> <pre class="literallayout">template<typename Iter> void <a name="idp99641152-bb"></a>generate(Iter first, Iter last);</pre> Fills a range with random values </li> </ol></div> </div> <div class="refsect2"> <a name="idp406330448"></a><h3> <a name="idp153623488-bb"></a><code class="computeroutput">rand48</code> friend functions</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout">template<typename CharT, typename Traits> friend std::basic_ostream< CharT, Traits > & <a name="idp153620864-bb"></a>operator<<(std::basic_ostream< CharT, Traits > & os, const <a class="link" href="rand48.html" title="Class rand48">rand48</a> & r);</pre> 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>. </li> <li class="listitem"> <pre class="literallayout">template<typename CharT, typename Traits> friend std::basic_istream< CharT, Traits > & <a name="idp100210032-bb"></a>operator>>(std::basic_istream< CharT, Traits > & is, <a class="link" href="rand48.html" title="Class rand48">rand48</a> & r);</pre> 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>. </li> <li class="listitem"> <pre class="literallayout">friend bool <a name="idp100206240-bb"></a>operator==(const <a class="link" href="rand48.html" title="Class rand48">rand48</a> & x, const <a class="link" href="rand48.html" title="Class rand48">rand48</a> & y);</pre> Returns true if the two generators will produce identical sequences of values. </li> <li class="listitem"> <pre class="literallayout">friend bool <a name="idp158870704-bb"></a>operator!=(const <a class="link" href="rand48.html" title="Class rand48">rand48</a> & x, const <a class="link" href="rand48.html" title="Class rand48">rand48</a> & y);</pre> Returns true if the two generators will produce different sequences of values. </li> </ol></div> </div> </div> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2000-2005 Jens Maurer Copyright © 2009, 2010 Steven Watanabe 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>) </div></td> </tr></table> <hr> <div class="spirit-nav"> <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> </div> </body> </html>