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fix math functions

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This commit is contained in:
bolero-MURAKAMI 2013-05-06 23:57:38 +09:00
parent 7794e56192
commit 56cb7702ea
19 changed files with 157 additions and 69 deletions
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31
sprout/math/floor.hpp
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@ -7,35 +7,48 @@
#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/equal_to.hpp>
#include <sprout/type_traits/enabler_if.hpp>
namespace sprout {
namespace math {
namespace detail {
template<typename FloatType>
inline SPROUT_CONSTEXPR FloatType
floor_impl(FloatType x, FloatType x0) {
template<typename T>
inline SPROUT_CONSTEXPR T
floor_impl_1(T x, T x0) {
return sprout::math::equal_to(x, x0) ? x0
: x0 - 1
: x0 - T(1)
;
}
template<typename T>
inline SPROUT_CONSTEXPR T
floor_impl(T x) {
return x < 0 ? sprout::math::detail::floor_impl_1(x, -static_cast<T>(static_cast<std::uintmax_t>(-x)))
: static_cast<T>(static_cast<std::uintmax_t>(x))
;
}
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
floor(FloatType x) {
return x == 0 ? FloatType(0)
return sprout::math::isnan(x) ? x
: x == std::numeric_limits<FloatType>::infinity() ? std::numeric_limits<FloatType>::infinity()
: x == -std::numeric_limits<FloatType>::infinity() ? -std::numeric_limits<FloatType>::infinity()
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
: std::floor(x)
#else
: x == 0 ? x
: std::numeric_limits<std::uintmax_t>::max() < x || std::numeric_limits<std::uintmax_t>::max() < -x
? SPROUT_MATH_THROW_LARGE_FLOAT_ROUNDING(std::runtime_error("floor: large float rounding."), x)
: x < 0 ? sprout::math::detail::floor_impl(x, -static_cast<FloatType>(static_cast<std::uintmax_t>(-x)))
: static_cast<FloatType>(static_cast<std::uintmax_t>(x))
: static_cast<FloatType>(sprout::math::detail::floor_impl(static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x)))
#endif
;
}
template<
typename IntType,
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
@ -46,7 +59,7 @@ namespace sprout {
}
} // namespace detail
using NS_SPROUT_MATH_DETAIL::floor;
using sprout::math::detail::floor;
} // namespace math
using sprout::math::floor;