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fix fmod

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This commit is contained in:
bolero-MURAKAMI 2013-05-07 13:40:18 +09:00
parent 56cb7702ea
commit 3498e9214f
4 changed files with 123 additions and 23 deletions
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29
sprout/math/remainder.hpp
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@ -6,6 +6,9 @@
#include <stdexcept>
#include <sprout/config.hpp>
#include <sprout/math/detail/config.hpp>
#include <sprout/math/detail/float_compute.hpp>
#include <sprout/math/isnan.hpp>
#include <sprout/math/signbit.hpp>
#include <sprout/math/round.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#include <sprout/type_traits/float_promote.hpp>
@ -13,20 +16,38 @@
namespace sprout {
namespace math {
namespace detail {
template<typename T>
inline SPROUT_CONSTEXPR T
remainder_impl(T x, T y) {
return x - sprout::math::round(x / y) * y;
}
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
remainder(FloatType x, FloatType y) {
return x == std::numeric_limits<FloatType>::infinity() || x == -std::numeric_limits<FloatType>::infinity() || y == 0
return sprout::math::isnan(y)
? sprout::math::isnan(x)
? sprout::math::signbit(y) || sprout::math::signbit(x) ? -std::numeric_limits<FloatType>::quiet_NaN()
: std::numeric_limits<FloatType>::quiet_NaN()
: y
: sprout::math::isnan(x) ? x
: x == 0 && y != 0 ? x
: x == std::numeric_limits<FloatType>::infinity() || x == -std::numeric_limits<FloatType>::infinity() || y == 0
? std::numeric_limits<FloatType>::quiet_NaN()
: x == 0 ? FloatType(0)
: y == std::numeric_limits<FloatType>::infinity() || y == -std::numeric_limits<FloatType>::infinity() ? x
: x - sprout::math::round(x / y) * y
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
: std::remainder(x, y)
#else
: static_cast<FloatType>(sprout::math::detail::remainder_impl(
static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x),
static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(y)
))
#endif
;
}
template<
typename ArithmeticType1,
typename ArithmeticType2,