| [29] | 1 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
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| 8 | <title>Boost Random Number Generator Library (Miscellaneous)</title> |
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| 9 | </head> |
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| 10 | |
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| 11 | <body bgcolor="#FFFFFF" text="#000000"> |
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| 12 | <h1>Random Number Generator Library --- Miscellaneous Decorators</h1> |
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| 13 | |
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| 14 | <ul> |
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| 15 | <li><a href="#random_number_generator">Class template |
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| 16 | <code>random_number_generator</code></a></li> |
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| 17 | </ul> |
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| 18 | |
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| 19 | <h2>Introduction</h2> |
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| 20 | |
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| 21 | <p>These decorator class templates allow adaptation of the random number |
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| 22 | generators and distribution functions to concepts found in the C++ Standard |
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| 23 | Library, in particular the RandomNumberGenerator and the InputIterator |
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| 24 | concepts. The latter adaptation is useful, because the the basic random |
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| 25 | number generators do not implement the InputIterator requirements per se, |
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| 26 | in contrast to the distribution functions.</p> |
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| 27 | |
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| 28 | <h2><a name="synopsis" id="synopsis">Synopsis</a> of miscellaneous |
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| 29 | decorators in header <code><boost/random.hpp></code></h2> |
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| 30 | <pre> |
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| 31 | namespace boost { |
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| 32 | template<class UniformRandomNumberGenerator, class IntType = long> |
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| 33 | class random_number_generator; |
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| 34 | } // namespace boost |
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| 35 | </pre> |
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| 36 | |
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| 37 | <h2><a name="random_number_generator" id="random_number_generator">Class |
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| 38 | template <code>random_number_generator</code></a></h2> |
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| 39 | |
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| 40 | <h3>Synopsis</h3> |
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| 41 | <pre> |
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| 42 | template<class UniformRandomNumberGenerator, class IntType = long> |
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| 43 | class random_number_generator |
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| 44 | { |
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| 45 | public: |
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| 46 | typedef UniformRandomNumberGenerator base_type; |
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| 47 | typedef IntType argument_type; |
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| 48 | typedef IntType result_type; |
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| 49 | random_number_generator(base_type & rng); |
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| 50 | result_type operator()(argument_type n); |
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| 51 | }; |
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| 52 | </pre> |
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| 53 | |
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| 54 | <h3>Description</h3> |
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| 55 | |
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| 56 | <p>Instantiations of class template <code>random_number_generator</code> |
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| 57 | model a RandomNumberGenerator (std:25.2.11 [lib.alg.random.shuffle]). On |
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| 58 | each invocation, it returns a uniformly distributed integer in the range |
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| 59 | [0..<code>n</code>).</p> |
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| 60 | |
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| 61 | <p>The template parameter <code>IntType</code> shall denote some |
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| 62 | integer-like value type.</p> |
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| 63 | |
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| 64 | <p><em>Note:</em> I consider it unfortunate that the C++ Standard uses the |
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| 65 | name RandomNumberGenerator for something rather specific.</p> |
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| 66 | |
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| 67 | <h3>Members</h3> |
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| 68 | <pre> |
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| 69 | random_number_generator(base_type & rng) |
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| 70 | </pre> |
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| 71 | |
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| 72 | <p><strong>Effects:</strong> Constructs a |
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| 73 | <code>random_number_generator</code> functor with the given uniform random |
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| 74 | number generator as the underlying source of random numbers.</p> |
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| 75 | <pre> |
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| 76 | result_type operator()(argument_type n) |
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| 77 | </pre> |
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| 78 | |
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| 79 | <p><strong>Returns:</strong> The value of |
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| 80 | <code>uniform_int<base_type>(rng, 0, n-1)()</code>.</p> |
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| 81 | <hr> |
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| 82 | |
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| 83 | <p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src= |
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| 84 | "http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional" |
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| 85 | height="31" width="88"></a></p> |
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| 86 | |
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| 87 | <p>Revised |
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| 88 | <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05 |
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| 89 | December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p> |
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| 90 | |
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| 91 | <p><i>Copyright © 2000-2005 <a href= |
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| 92 | "../../people/jens_maurer.htm">Jens Maurer</a></i></p> |
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| 93 | |
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| 94 | <p><i>Distributed under the Boost Software License, Version 1.0. (See |
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| 95 | accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or |
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| 96 | copy at <a href= |
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| 97 | "http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p> |
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| 98 | </body> |
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| 99 | </html> |
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