mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2015 Bolero MURAKAMI
|
|
https://github.com/bolero-MURAKAMI/Sprout
|
|
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
=============================================================================*/
|
|
#ifndef SPROUT_MATH_FDIM_HPP
|
|
#define SPROUT_MATH_FDIM_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/type_traits/float_promote.hpp>
|
|
#include <sprout/type_traits/enabler_if.hpp>
|
|
|
|
namespace sprout {
|
|
namespace math {
|
|
namespace detail {
|
|
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
|
|
inline SPROUT_CONSTEXPR float
|
|
builtin_fdim(float x, float y) {
|
|
return __builtin_fdimf(x, y);
|
|
}
|
|
inline SPROUT_CONSTEXPR double
|
|
builtin_fdim(double x, double y) {
|
|
return __builtin_fdim(x, y);
|
|
}
|
|
inline SPROUT_CONSTEXPR long double
|
|
builtin_fdim(long double x, long double y) {
|
|
return __builtin_fdiml(x, y);
|
|
}
|
|
#endif
|
|
} // namespace detail
|
|
//
|
|
// fdim
|
|
//
|
|
template<
|
|
typename FloatType,
|
|
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR FloatType
|
|
fdim(FloatType x, FloatType y) {
|
|
return sprout::math::isnan(y) ? y
|
|
: sprout::math::isnan(x) ? x
|
|
: x == sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
|
|
: x == -sprout::numeric_limits<FloatType>::infinity() ? FloatType(0)
|
|
: y == sprout::numeric_limits<FloatType>::infinity() ? FloatType(0)
|
|
: y == -sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
|
|
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
|
|
: sprout::math::detail::builtin_fdim(x, y)
|
|
#else
|
|
: x > y ? x - y : FloatType(0)
|
|
#endif
|
|
;
|
|
}
|
|
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
|
|
fdim(ArithmeticType1 x, ArithmeticType2 y) {
|
|
typedef typename sprout::float_promote<ArithmeticType1, ArithmeticType2>::type type;
|
|
return sprout::math::fdim(static_cast<type>(x), static_cast<type>(y));
|
|
}
|
|
} // namespace math
|
|
|
|
using sprout::math::fdim;
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_MATH_FDIM_HPP
|