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

71
sprout/math/exp.hpp
View file

@ -22,6 +22,21 @@
namespace sprout {
namespace math {
namespace detail {
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
inline SPROUT_CONSTEXPR float
builtin_exp(float x) {
return __builtin_expf(x);
}
inline SPROUT_CONSTEXPR double
builtin_exp(double x) {
return __builtin_exp(x);
}
inline SPROUT_CONSTEXPR long double
builtin_exp(long double x) {
return __builtin_expl(x);
}
#endif
template<typename T>
inline SPROUT_CONSTEXPR T
exp_impl_1(T x, std::size_t n, std::size_t last) {
@ -38,35 +53,35 @@ namespace sprout {
: T(1) + sprout::math::detail::exp_impl_1(x, 1, sprout::math::factorial_limit<T>() / 2 + 1)
;
}
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
exp(FloatType x) {
return sprout::math::isnan(x) ? x
: x == -sprout::numeric_limits<FloatType>::infinity() ? FloatType(0)
: x == sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
: std::exp(x)
#else
: x == 0 ? FloatType(1)
: static_cast<FloatType>(sprout::math::detail::exp_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
exp(IntType x) {
return sprout::math::detail::exp(static_cast<double>(x));
}
} // namespace detail
using sprout::math::detail::exp;
//
// exp
//
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
exp(FloatType x) {
return sprout::math::isnan(x) ? x
: x == -sprout::numeric_limits<FloatType>::infinity() ? FloatType(0)
: x == sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
: sprout::math::detail::builtin_exp(x)
#else
: x == 0 ? FloatType(1)
: static_cast<FloatType>(sprout::math::detail::exp_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
exp(IntType x) {
return sprout::math::exp(static_cast<double>(x));
}
} // namespace math
using sprout::math::exp;