2013-02-06 18:11:17 +00:00
|
|
|
#ifndef SPROUT_MATH_SCALBLN_HPP
|
|
|
|
#define SPROUT_MATH_SCALBLN_HPP
|
|
|
|
|
2013-02-07 14:12:57 +00:00
|
|
|
#include <limits>
|
2013-02-06 18:11:17 +00:00
|
|
|
#include <type_traits>
|
|
|
|
#include <sprout/config.hpp>
|
|
|
|
#include <sprout/math/detail/config.hpp>
|
2013-04-25 06:36:19 +00:00
|
|
|
#include <sprout/math/detail/float_compute.hpp>
|
|
|
|
#include <sprout/math/copysign.hpp>
|
2013-02-06 18:11:17 +00:00
|
|
|
#include <sprout/detail/pow.hpp>
|
|
|
|
#include <sprout/type_traits/enabler_if.hpp>
|
|
|
|
|
|
|
|
namespace sprout {
|
|
|
|
namespace math {
|
|
|
|
namespace detail {
|
2013-04-25 06:36:19 +00:00
|
|
|
template<typename FloatType, typename T>
|
|
|
|
inline SPROUT_CONSTEXPR T
|
|
|
|
scalbln_impl(T x, long exp) {
|
|
|
|
return x * sprout::detail::pow_n(T(std::numeric_limits<FloatType>::radix), exp);
|
|
|
|
}
|
|
|
|
|
2013-02-06 18:11:17 +00:00
|
|
|
template<
|
|
|
|
typename FloatType,
|
|
|
|
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
|
|
|
|
>
|
|
|
|
inline SPROUT_CONSTEXPR FloatType
|
|
|
|
scalbln(FloatType x, long exp) {
|
2013-04-25 06:36:19 +00:00
|
|
|
return x == std::numeric_limits<FloatType>::infinity() ? std::numeric_limits<FloatType>::infinity()
|
2013-02-14 09:02:43 +00:00
|
|
|
: x == -std::numeric_limits<FloatType>::infinity() ? -std::numeric_limits<FloatType>::infinity()
|
|
|
|
: exp == 0 ? x
|
2013-04-25 06:36:19 +00:00
|
|
|
: x == 0 ? sprout::math::copysign(FloatType(0), x)
|
|
|
|
: static_cast<FloatType>(sprout::math::detail::scalbln_impl<FloatType>(static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x), exp))
|
2013-02-14 09:02:43 +00:00
|
|
|
;
|
2013-02-06 18:11:17 +00:00
|
|
|
}
|
|
|
|
template<
|
|
|
|
typename IntType,
|
|
|
|
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
|
|
|
|
>
|
|
|
|
inline SPROUT_CONSTEXPR double
|
|
|
|
scalbln(IntType x, long exp) {
|
|
|
|
return sprout::math::detail::scalbln(static_cast<double>(x), exp);
|
|
|
|
}
|
|
|
|
} // namespace detail
|
|
|
|
|
|
|
|
using NS_SPROUT_MATH_DETAIL::scalbln;
|
|
|
|
} // namespace math
|
|
|
|
|
|
|
|
using sprout::math::scalbln;
|
|
|
|
} // namespace sprout
|
|
|
|
|
|
|
|
#endif // #ifndef SPROUT_MATH_SCALBLN_HPP
|