Chris@16: /* boost random/detail/uniform_int_float.hpp header file
Chris@16:  *
Chris@16:  * Copyright Jens Maurer 2000-2001
Chris@16:  * Copyright Steven Watanabe 2011
Chris@16:  * Distributed under the Boost Software License, Version 1.0. (See
Chris@16:  * accompanying file LICENSE_1_0.txt or copy at
Chris@16:  * http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  *
Chris@16:  * See http://www.boost.org for most recent version including documentation.
Chris@16:  *
Chris@101:  * $Id$
Chris@16:  *
Chris@16:  */
Chris@16: 
Chris@16: #ifndef BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP
Chris@16: #define BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP
Chris@16: 
Chris@16: #include <boost/limits.hpp>
Chris@16: #include <boost/config.hpp>
Chris@16: #include <boost/integer.hpp>
Chris@16: #include <boost/random/detail/config.hpp>
Chris@16: #include <boost/random/detail/generator_bits.hpp>
Chris@16: 
Chris@16: #include <boost/random/detail/disable_warnings.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace random {
Chris@16: namespace detail {
Chris@16: 
Chris@16: template<class URNG>
Chris@16: class uniform_int_float
Chris@16: {
Chris@16: public:
Chris@16:     typedef URNG base_type;
Chris@16:     typedef typename base_type::result_type base_result;
Chris@16: 
Chris@16:     typedef typename boost::uint_t<
Chris@16:         (std::numeric_limits<boost::uintmax_t>::digits <
Chris@16:             std::numeric_limits<base_result>::digits)?
Chris@16:         std::numeric_limits<boost::uintmax_t>::digits :
Chris@16:         std::numeric_limits<base_result>::digits
Chris@16:     >::fast result_type;
Chris@16: 
Chris@16:     uniform_int_float(base_type& rng)
Chris@16:       : _rng(rng) {}
Chris@16: 
Chris@16:     static result_type min BOOST_PREVENT_MACRO_SUBSTITUTION ()
Chris@16:     { return 0; }
Chris@16:     static result_type max BOOST_PREVENT_MACRO_SUBSTITUTION ()
Chris@16:     {
Chris@16:         std::size_t digits = std::numeric_limits<result_type>::digits;
Chris@16:         if(detail::generator_bits<URNG>::value() < digits) {
Chris@16:             digits = detail::generator_bits<URNG>::value();
Chris@16:         }
Chris@16:         return (result_type(2) << (digits - 1)) - 1;
Chris@16:     }
Chris@16:     base_type& base() { return _rng; }
Chris@16:     const base_type& base() const { return _rng; }
Chris@16: 
Chris@16:     result_type operator()()
Chris@16:     {
Chris@16:         base_result range = static_cast<base_result>((max)())+1;
Chris@16:         return static_cast<result_type>(_rng() * range);
Chris@16:     }
Chris@16: 
Chris@16: private:
Chris@16:     base_type& _rng;
Chris@16: };
Chris@16: 
Chris@16: } // namespace detail
Chris@16: } // namespace random
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/random/detail/enable_warnings.hpp>
Chris@16: 
Chris@16: #endif // BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP