King_DuckZ/Sprout
1
0
Fork 0
mirror of https://github.com/bolero-MURAKAMI/Sprout synced 2025-08-03 12:49:50 +00:00
Code Issues Releases Wiki Activity

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

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

75
sprout/math/lgamma.hpp
View file

@ -26,6 +26,21 @@
namespace sprout {
namespace math {
namespace detail {
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
inline SPROUT_CONSTEXPR float
builtin_lgamma(float x) {
return __builtin_lgammaf(x);
}
inline SPROUT_CONSTEXPR double
builtin_lgamma(double x) {
return __builtin_lgamma(x);
}
inline SPROUT_CONSTEXPR long double
builtin_lgamma(long double x) {
return __builtin_lgammal(x);
}
#endif
template<typename T>
inline SPROUT_CONSTEXPR T
lgamma_impl_3(T x, T y) {
@ -183,38 +198,38 @@ namespace sprout {
lgamma_impl(T x) {
return sprout::math::detail::lgamma_impl_1(x, x < 0 ? -x : x);
}
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
lgamma(FloatType x) {
return sprout::math::isnan(x) ? x
: x <= 0 && sprout::math::is_integer(x) ? sprout::numeric_limits<FloatType>::infinity()
: x == -sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
: x == sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
//#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
// : std::lgamma(x)
//#else
: x == 1 ? FloatType(0)
: x == 2 ? FloatType(0)
: static_cast<FloatType>(sprout::math::detail::lgamma_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
lgamma(IntType x) {
return sprout::math::detail::lgamma(static_cast<double>(x));
}
} // namespace detail
//
// lgamma
//
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
lgamma(FloatType x) {
return sprout::math::isnan(x) ? x
: x <= 0 && sprout::math::is_integer(x) ? sprout::numeric_limits<FloatType>::infinity()
: x == -sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
: x == sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
//#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
// : sprout::math::detail::builtin_lgamma(x)
//#else
: x == 1 ? FloatType(0)
: x == 2 ? FloatType(0)
: static_cast<FloatType>(sprout::math::detail::lgamma_impl(static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x)))
//#endif
;
}
using sprout::math::detail::lgamma;
template<
typename IntType,
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR double
lgamma(IntType x) {
return sprout::math::lgamma(static_cast<double>(x));
}
} // namespace math
using sprout::math::lgamma;