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fix math functions

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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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43
sprout/math/round.hpp
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@ -7,41 +7,54 @@
#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/type_traits/enabler_if.hpp>
namespace sprout {
namespace math {
namespace detail {
template<typename FloatType>
inline SPROUT_CONSTEXPR FloatType
round_impl_positive(FloatType x, FloatType x0) {
return x - x0 < FloatType(0.5) ? x0
: x0 + 1
template<typename T>
inline SPROUT_CONSTEXPR T
round_impl_positive(T x, T x0) {
return x - x0 < T(0.5) ? x0
: x0 + T(1)
;
}
template<typename FloatType>
inline SPROUT_CONSTEXPR FloatType
round_impl_nagative(FloatType x, FloatType x0) {
return x0 - x < FloatType(0.5) ? x0
: x0 - 1
template<typename T>
inline SPROUT_CONSTEXPR T
round_impl_nagative(T x, T x0) {
return x0 - x < T(0.5) ? x0
: x0 - T(1)
;
}
template<typename T>
inline SPROUT_CONSTEXPR T
round_impl(T x) {
return x < 0 ? sprout::math::detail::round_impl_nagative(x, -static_cast<T>(static_cast<std::uintmax_t>(-x)))
: sprout::math::detail::round_impl_positive(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
round(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::round(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("round: large float rounding."), x)
: x < 0 ? sprout::math::detail::round_impl_nagative(x, -static_cast<FloatType>(static_cast<std::uintmax_t>(-x)))
: sprout::math::detail::round_impl_positive(x, static_cast<FloatType>(static_cast<std::uintmax_t>(x)))
: static_cast<FloatType>(sprout::math::detail::round_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
@ -52,7 +65,7 @@ namespace sprout {
}
} // namespace detail
using NS_SPROUT_MATH_DETAIL::round;
using sprout::math::detail::round;
} // namespace math
using sprout::math::round;