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fix: math functions (support for inferior C++14 standard)

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add C++14 constexpr modifying algorithms
This commit is contained in:
bolero-MURAKAMI 2013-10-25 12:29:16 +09:00
parent 58cff54e0d
commit c58c9cc0fc
106 changed files with 3465 additions and 2144 deletions
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73
sprout/math/tgamma.hpp
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@ -26,6 +26,21 @@
namespace sprout {
namespace math {
namespace detail {
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
inline SPROUT_CONSTEXPR float
builtin_tgamma(float x) {
return __builtin_tgammaf(x);
}
inline SPROUT_CONSTEXPR double
builtin_tgamma(double x) {
return __builtin_tgamma(x);
}
inline SPROUT_CONSTEXPR long double
builtin_tgamma(long double x) {
return __builtin_tgammal(x);
}
#endif
template<typename T>
inline SPROUT_CONSTEXPR T
tgamma_impl_y(T w) {
@ -107,42 +122,42 @@ namespace sprout {
)
);
}
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
tgamma(FloatType x) {
return sprout::math::isnan(x) ? x
: x == 0 ? sprout::math::copysign(sprout::numeric_limits<FloatType>::infinity(), x)
: x == -sprout::numeric_limits<FloatType>::infinity() ? -sprout::numeric_limits<FloatType>::quiet_NaN()
: x == sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
: x < 0 && sprout::math::is_integer(x) ? sprout::numeric_limits<FloatType>::quiet_NaN()
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
: std::tgamma(x)
#else
: static_cast<FloatType>(sprout::math::detail::tgamma_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
>
inline SPROUT_CONSTEXPR double
tgamma(IntType x) {
return sprout::math::detail::tgamma(static_cast<double>(x));
}
} // namespace detail
//
// tgamma
//
// issue:
// [ !SPROUT_USE_BUILTIN_CMATH_FUNCTION ]
// tgamma(-0) returns -<2D>‡ .
// # returns +<2B>‡ . ( same as tgamma(+0) )
//
using sprout::math::detail::tgamma;
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
tgamma(FloatType x) {
return sprout::math::isnan(x) ? x
: x == 0 ? sprout::math::copysign(sprout::numeric_limits<FloatType>::infinity(), x)
: x == -sprout::numeric_limits<FloatType>::infinity() ? -sprout::numeric_limits<FloatType>::quiet_NaN()
: x == sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
: x < 0 && sprout::math::is_integer(x) ? sprout::numeric_limits<FloatType>::quiet_NaN()
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
: sprout::math::detail::builtin_tgamma(x)
#else
: static_cast<FloatType>(sprout::math::detail::tgamma_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
>
inline SPROUT_CONSTEXPR double
tgamma(IntType x) {
return sprout::math::tgamma(static_cast<double>(x));
}
} // namespace math
using sprout::math::tgamma;