[857] | 1 | /* boost random/random_number_generator.hpp header file
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| 2 | *
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| 3 | * Copyright Jens Maurer 2000-2001
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| 4 | * Distributed under the Boost Software License, Version 1.0. (See
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| 5 | * accompanying file LICENSE_1_0.txt or copy at
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| 6 | * http://www.boost.org/LICENSE_1_0.txt)
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| 7 | *
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| 8 | * See http://www.boost.org for most recent version including documentation.
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| 9 | *
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| 10 | * $Id: random_number_generator.hpp,v 1.5 2004/11/09 21:22:00 jmaurer Exp $
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| 11 | *
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| 12 | * Revision history
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| 13 | * 2001-02-18 moved to individual header files
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| 14 | */
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| 15 |
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| 16 | #ifndef BOOST_RANDOM_RANDOM_NUMBER_GENERATOR_HPP
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| 17 | #define BOOST_RANDOM_RANDOM_NUMBER_GENERATOR_HPP
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| 18 |
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| 19 | #include <boost/config.hpp>
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| 20 | #include <boost/limits.hpp>
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| 21 | #include <boost/static_assert.hpp>
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| 22 | #include <boost/random/uniform_int.hpp>
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| 23 | #include <boost/random/variate_generator.hpp>
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| 24 |
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| 25 | namespace boost {
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| 26 |
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| 27 | // a model for RandomNumberGenerator std:25.2.11 [lib.alg.random.shuffle]
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| 28 | template<class UniformRandomNumberGenerator, class IntType = long>
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| 29 | class random_number_generator
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| 30 | {
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| 31 | public:
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| 32 | typedef UniformRandomNumberGenerator base_type;
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| 33 | typedef IntType argument_type;
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| 34 | typedef IntType result_type;
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| 35 | random_number_generator(base_type& rng) : _rng(rng)
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| 36 | {
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| 37 | #ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
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| 38 | BOOST_STATIC_ASSERT(std::numeric_limits<result_type>::is_integer);
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| 39 | #endif
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| 40 | }
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| 41 | // compiler-generated copy ctor is fine
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| 42 | // assignment is disallowed because there is a reference member
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| 43 |
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| 44 | result_type operator()(argument_type n)
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| 45 | {
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| 46 | typedef uniform_int<IntType> dist_type;
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| 47 | return variate_generator<base_type&, dist_type>(_rng, dist_type(0, n-1))();
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| 48 | }
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| 49 |
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| 50 | private:
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| 51 | base_type& _rng;
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| 52 | };
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| 53 |
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| 54 | } // namespace boost
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| 55 |
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| 56 | #endif // BOOST_RANDOM_RANDOM_NUMBER_GENERATOR_HPP
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