mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
61 lines
2.1 KiB
C++
61 lines
2.1 KiB
C++
#ifndef SPROUT_MATH_COPYSIGN_HPP
|
||
#define SPROUT_MATH_COPYSIGN_HPP
|
||
|
||
#include <type_traits>
|
||
#include <sprout/config.hpp>
|
||
#include <sprout/limits.hpp>
|
||
#include <sprout/math/detail/config.hpp>
|
||
#include <sprout/math/isnan.hpp>
|
||
#include <sprout/math/signbit.hpp>
|
||
#include <sprout/type_traits/float_promote.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
|
||
copysign(FloatType x, FloatType y) {
|
||
return x == 0
|
||
? y == 0 ? y
|
||
: sprout::math::signbit(y) ? -FloatType(0)
|
||
: FloatType(0)
|
||
: sprout::math::isnan(x)
|
||
? sprout::math::isnan(y) ? y
|
||
: sprout::math::signbit(y) ? -sprout::numeric_limits<FloatType>::quiet_NaN()
|
||
: sprout::numeric_limits<FloatType>::quiet_NaN()
|
||
: sprout::math::signbit(y) != sprout::math::signbit(x) ? -x
|
||
: x
|
||
;
|
||
}
|
||
template<
|
||
typename ArithmeticType1,
|
||
typename ArithmeticType2,
|
||
typename sprout::enabler_if<
|
||
std::is_arithmetic<ArithmeticType1>::value && std::is_arithmetic<ArithmeticType2>::value
|
||
>::type = sprout::enabler
|
||
>
|
||
inline SPROUT_CONSTEXPR typename sprout::float_promote<ArithmeticType1, ArithmeticType2>::type
|
||
copysign(ArithmeticType1 x, ArithmeticType2 y) {
|
||
typedef typename sprout::float_promote<ArithmeticType1, ArithmeticType2>::type type;
|
||
return sprout::math::detail::copysign(static_cast<type>(x), static_cast<type>(y));
|
||
}
|
||
} // namespace detail
|
||
//
|
||
// issue:
|
||
// [ !SPROUT_USE_BUILTIN_CMATH_FUNCTION ]
|
||
// copysign(<28>}x, -0) returns -x for |x| is not 0 .
|
||
// # returns +x . ( same as copysign(<28>}x, +0) )
|
||
// copysign(<28>}x, -NaN) returns -x for |x| is not NaN .
|
||
// # returns +x . ( same as copysign(<28>}x, +NaN) )
|
||
//
|
||
using NS_SPROUT_MATH_DETAIL::copysign;
|
||
} // namespace math
|
||
|
||
using sprout::math::copysign;
|
||
} // namespace sprout
|
||
|
||
#endif // #ifndef SPROUT_MATH_COPYSIGN_HPP
|