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/* 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: uniform_int_float.hpp 72951 2011-07-07 04:57:37Z steven_watanabe $
*
*/
#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
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