1 /* boost random/random_number_generator.hpp header file

     2  *

     3  * Copyright Jens Maurer 2000-2001

     4  * Distributed under the Boost Software License, Version 1.0. (See

     5  * accompanying file LICENSE_1_0.txt or copy at

     6  * http://www.boost.org/LICENSE_1_0.txt)

     7  *

     8  * See http://www.boost.org for most recent version including documentation.

     9  *

    10  * $Id: random_number_generator.hpp,v 1.5 2004/11/09 21:22:00 jmaurer Exp $

    11  *

    12  * Revision history

    13  *  2001-02-18  moved to individual header files

    14  */

    15 

    16 #ifndef BOOST_RANDOM_RANDOM_NUMBER_GENERATOR_HPP

    17 #define BOOST_RANDOM_RANDOM_NUMBER_GENERATOR_HPP

    18 

    19 #include <boost/config.hpp>

    20 #include <boost/limits.hpp>

    21 #include <boost/static_assert.hpp>

    22 #include <boost/random/uniform_int.hpp>

    23 #include <boost/random/variate_generator.hpp>

    24 

    25 namespace boost {

    26 

    27 // a model for RandomNumberGenerator std:25.2.11 [lib.alg.random.shuffle]

    28 template<class UniformRandomNumberGenerator, class IntType = long>

    29 class random_number_generator

    30 {

    31 public:

    32   typedef UniformRandomNumberGenerator base_type;

    33   typedef IntType argument_type;

    34   typedef IntType result_type;

    35   random_number_generator(base_type& rng) : _rng(rng)

    36   { 

    37 #ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS

    38     BOOST_STATIC_ASSERT(std::numeric_limits<result_type>::is_integer);

    39 #endif

    40   }

    41   // compiler-generated copy ctor is fine

    42   // assignment is disallowed because there is a reference member

    43 

    44   result_type operator()(argument_type n)

    45   {

    46     typedef uniform_int<IntType> dist_type;

    47     return variate_generator<base_type&, dist_type>(_rng, dist_type(0, n-1))();

    48   }

    49 

    50 private:

    51   base_type& _rng;

    52 };

    53 

    54 } // namespace boost

    55 

    56 #endif // BOOST_RANDOM_RANDOM_NUMBER_GENERATOR_HPP