mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
#ifndef SPROUT_MATH_FRACTIONAL_PART_HPP
|
|
#define SPROUT_MATH_FRACTIONAL_PART_HPP
|
|
|
|
#include <limits>
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/math/detail/config.hpp>
|
|
#include <sprout/math/copysign.hpp>
|
|
#include <sprout/math/isnan.hpp>
|
|
#include <sprout/math/integer_part.hpp>
|
|
#include <sprout/type_traits/enabler_if.hpp>
|
|
|
|
namespace sprout {
|
|
namespace math {
|
|
namespace detail {
|
|
template<typename T>
|
|
inline SPROUT_CONSTEXPR T
|
|
fractional_part_impl(T x, T ipart) {
|
|
return x == ipart ? T(0) * x
|
|
: sprout::math::copysign(x - ipart, x)
|
|
;
|
|
}
|
|
|
|
template<
|
|
typename FloatType,
|
|
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR FloatType
|
|
fractional_part(FloatType x) {
|
|
return x == std::numeric_limits<FloatType>::infinity() || x == -std::numeric_limits<FloatType>::infinity() ? sprout::math::copysign(FloatType(0), x)
|
|
: sprout::math::isnan(x) ? std::numeric_limits<FloatType>::quiet_NaN()
|
|
: x == 0 ? x
|
|
: sprout::math::detail::fractional_part_impl(x, sprout::integer_part(x))
|
|
;
|
|
}
|
|
template<
|
|
typename IntType,
|
|
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR double
|
|
fractional_part(IntType x) {
|
|
return sprout::math::detail::fractional_part(static_cast<double>(x));
|
|
}
|
|
} // namespace detail
|
|
|
|
using sprout::math::detail::fractional_part;
|
|
} // namespace math
|
|
|
|
using sprout::math::fractional_part;
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_MATH_FRACTIONAL_PART_HPP
|