mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
#ifndef SPROUT_MATH_EXP2_HPP
|
|
#define SPROUT_MATH_EXP2_HPP
|
|
|
|
#include <limits>
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/math/detail/config.hpp>
|
|
#include <sprout/math/exp.hpp>
|
|
#include <sprout/math/constants.hpp>
|
|
#include <sprout/type_traits/enabler_if.hpp>
|
|
|
|
namespace sprout {
|
|
namespace math {
|
|
namespace detail {
|
|
template<
|
|
typename FloatType,
|
|
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR FloatType
|
|
exp2(FloatType x) {
|
|
return x == 0 ? FloatType(1)
|
|
: x == -std::numeric_limits<FloatType>::infinity() ? FloatType(0)
|
|
: x == std::numeric_limits<FloatType>::infinity() ? std::numeric_limits<FloatType>::infinity()
|
|
: sprout::math::exp(x * sprout::math::ln_two<FloatType>())
|
|
;
|
|
}
|
|
|
|
template<
|
|
typename IntType,
|
|
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR double
|
|
exp2(IntType x) {
|
|
return sprout::math::detail::exp2(static_cast<double>(x));
|
|
}
|
|
} // namespace detail
|
|
|
|
using NS_SPROUT_MATH_DETAIL::exp2;
|
|
} // namespace math
|
|
|
|
using sprout::math::exp2;
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_MATH_EXP2_HPP
|