/* boost random/random_number_generator.hpp header file

 *

 * Copyright Jens Maurer 2000-2001

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

 * accompanying file LICENSE_1_0.txt or copy at

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

 *

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

 *

 * $Id: random_number_generator.hpp 26164 2004-11-09 21:22:00Z jmaurer $

 *

 * Revision history

 *  2001-02-18  moved to individual header files

 */



#ifndef BOOST_RANDOM_RANDOM_NUMBER_GENERATOR_HPP

#define BOOST_RANDOM_RANDOM_NUMBER_GENERATOR_HPP



#include <boost/config.hpp>

#include <boost/limits.hpp>

#include <boost/static_assert.hpp>

#include <boost/random/uniform_int.hpp>

#include <boost/random/variate_generator.hpp>



namespace boost {



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

template<class UniformRandomNumberGenerator, class IntType = long>

class random_number_generator

{

public:

  typedef UniformRandomNumberGenerator base_type;

  typedef IntType argument_type;

  typedef IntType result_type;

  random_number_generator(base_type& rng) : _rng(rng)

  { 

#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS

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

#endif

  }

  // compiler-generated copy ctor is fine

  // assignment is disallowed because there is a reference member



  result_type operator()(argument_type n)

  {

    typedef uniform_int<IntType> dist_type;

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

  }



private:

  base_type& _rng;

};



} // namespace boost



#endif // BOOST_RANDOM_RANDOM_NUMBER_GENERATOR_HPP

