mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
#ifndef SPROUT_MATH_SCALBN_HPP
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#define SPROUT_MATH_SCALBN_HPP
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#include <limits>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/math/detail/config.hpp>
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#include <sprout/math/detail/float_compute.hpp>
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#include <sprout/detail/pow.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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namespace sprout {
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namespace math {
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namespace detail {
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template<typename FloatType, typename T>
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inline SPROUT_CONSTEXPR T
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scalbn_impl(T x, int exp) {
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return x * sprout::detail::pow_n(T(std::numeric_limits<FloatType>::radix), exp);
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}
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template<
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typename FloatType,
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typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR FloatType
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scalbn(FloatType x, int exp) {
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return x == std::numeric_limits<FloatType>::infinity() ? std::numeric_limits<FloatType>::infinity()
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: x == -std::numeric_limits<FloatType>::infinity() ? -std::numeric_limits<FloatType>::infinity()
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: exp == 0 ? x
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: x == 0 ? x
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: static_cast<FloatType>(sprout::math::detail::scalbn_impl<FloatType>(static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x), exp))
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;
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}
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template<
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typename IntType,
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typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR double
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scalbn(IntType x, int exp) {
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return sprout::math::detail::scalbn(static_cast<double>(x), exp);
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}
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} // namespace detail
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using NS_SPROUT_MATH_DETAIL::scalbn;
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} // namespace math
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using sprout::math::scalbn;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_SCALBN_HPP
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