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3.4 KiB
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100 lines
3.4 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<meta http-equiv="Content-Language" content="en-us">
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<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
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<title>Boost Random Number Generator Library (Miscellaneous)</title>
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</head>
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<body bgcolor="#FFFFFF" text="#000000">
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<h1>Random Number Generator Library --- Miscellaneous Decorators</h1>
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<ul>
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<li><a href="#random_number_generator">Class template
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<code>random_number_generator</code></a></li>
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</ul>
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<h2>Introduction</h2>
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<p>These decorator class templates allow adaptation of the random number
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generators and distribution functions to concepts found in the C++ Standard
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Library, in particular the RandomNumberGenerator and the InputIterator
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concepts. The latter adaptation is useful, because the the basic random
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number generators do not implement the InputIterator requirements per se,
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in contrast to the distribution functions.</p>
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<h2><a name="synopsis" id="synopsis">Synopsis</a> of miscellaneous
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decorators in header <code><boost/random.hpp></code></h2>
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<pre>
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namespace boost {
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template<class UniformRandomNumberGenerator, class IntType = long>
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class random_number_generator;
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} // namespace boost
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</pre>
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<h2><a name="random_number_generator" id="random_number_generator">Class
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template <code>random_number_generator</code></a></h2>
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<h3>Synopsis</h3>
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<pre>
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template<class UniformRandomNumberGenerator, class IntType = long>
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class random_number_generator
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{
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public:
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typedef UniformRandomNumberGenerator base_type;
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typedef IntType argument_type;
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typedef IntType result_type;
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random_number_generator(base_type & rng);
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result_type operator()(argument_type n);
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};
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</pre>
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<h3>Description</h3>
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<p>Instantiations of class template <code>random_number_generator</code>
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model a RandomNumberGenerator (std:25.2.11 [lib.alg.random.shuffle]). On
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each invocation, it returns a uniformly distributed integer in the range
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[0..<code>n</code>).</p>
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<p>The template parameter <code>IntType</code> shall denote some
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integer-like value type.</p>
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<p><em>Note:</em> I consider it unfortunate that the C++ Standard uses the
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name RandomNumberGenerator for something rather specific.</p>
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<h3>Members</h3>
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<pre>
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random_number_generator(base_type & rng)
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</pre>
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<p><strong>Effects:</strong> Constructs a
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<code>random_number_generator</code> functor with the given uniform random
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number generator as the underlying source of random numbers.</p>
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<pre>
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result_type operator()(argument_type n)
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</pre>
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<p><strong>Returns:</strong> The value of
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<code>uniform_int<base_type>(rng, 0, n-1)()</code>.</p>
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<hr>
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<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
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"http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional"
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height="31" width="88"></a></p>
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<p>Revised
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<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05
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December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p>
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<p><i>Copyright © 2000-2005 <a href=
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"http://www.boost.org/people/jens_maurer.htm">Jens Maurer</a></i></p>
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<p><i>Distributed under the Boost Software License, Version 1.0. (See
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accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
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copy at <a href=
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"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
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</body>
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</html>
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