| /* boost random/detail/uniform_int_float.hpp header file |
| * |
| * Copyright Jens Maurer 2000-2001 |
| * Copyright Steven Watanabe 2011 |
| * 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. |
| * |
| * $Id$ |
| * |
| */ |
| |
| #ifndef BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP |
| #define BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP |
| |
| #include <boost/limits.hpp> |
| #include <boost/config.hpp> |
| #include <boost/integer.hpp> |
| #include <boost/random/detail/config.hpp> |
| #include <boost/random/detail/generator_bits.hpp> |
| |
| #include <boost/random/detail/disable_warnings.hpp> |
| |
| namespace boost { |
| namespace random { |
| namespace detail { |
| |
| template<class URNG> |
| class uniform_int_float |
| { |
| public: |
| typedef URNG base_type; |
| typedef typename base_type::result_type base_result; |
| |
| typedef typename boost::uint_t< |
| (std::numeric_limits<boost::uintmax_t>::digits < |
| std::numeric_limits<base_result>::digits)? |
| std::numeric_limits<boost::uintmax_t>::digits : |
| std::numeric_limits<base_result>::digits |
| >::fast result_type; |
| |
| uniform_int_float(base_type& rng) |
| : _rng(rng) {} |
| |
| static result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () |
| { return 0; } |
| static result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () |
| { |
| std::size_t digits = std::numeric_limits<result_type>::digits; |
| if(detail::generator_bits<URNG>::value() < digits) { |
| digits = detail::generator_bits<URNG>::value(); |
| } |
| return (result_type(2) << (digits - 1)) - 1; |
| } |
| base_type& base() { return _rng; } |
| const base_type& base() const { return _rng; } |
| |
| result_type operator()() |
| { |
| base_result range = static_cast<base_result>((max)())+1; |
| return static_cast<result_type>(_rng() * range); |
| } |
| |
| private: |
| base_type& _rng; |
| }; |
| |
| } // namespace detail |
| } // namespace random |
| } // namespace boost |
| |
| #include <boost/random/detail/enable_warnings.hpp> |
| |
| #endif // BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP |