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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/log.hpp
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@ -24,6 +24,21 @@
namespace sprout {
namespace math {
namespace detail {
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
inline SPROUT_CONSTEXPR float
builtin_log(float x) {
return __builtin_logf(x);
}
inline SPROUT_CONSTEXPR double
builtin_log(double x) {
return __builtin_log(x);
}
inline SPROUT_CONSTEXPR long double
builtin_log(long double x) {
return __builtin_logl(x);
}
#endif
template<typename T>
inline SPROUT_CONSTEXPR T
log_impl_2(T x, std::size_t n, std::size_t last) {
@ -48,36 +63,36 @@ namespace sprout {
: sprout::math::detail::log_impl_1(x)
;
}
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
log(FloatType x) {
return sprout::math::isnan(x) ? x
: x == 0 ? -sprout::numeric_limits<FloatType>::infinity()
: x == sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
: x < 0 ? sprout::numeric_limits<FloatType>::quiet_NaN()
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
: std::log(x)
#else
: x == 1 ? FloatType(0)
: static_cast<FloatType>(sprout::math::detail::log_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
log(IntType x) {
return sprout::math::detail::log(static_cast<double>(x));
}
} // namespace detail
using sprout::math::detail::log;
//
// log
//
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
log(FloatType x) {
return sprout::math::isnan(x) ? x
: x == 0 ? -sprout::numeric_limits<FloatType>::infinity()
: x == sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
: x < 0 ? sprout::numeric_limits<FloatType>::quiet_NaN()
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
: sprout::math::detail::builtin_log(x)
#else
: x == 1 ? FloatType(0)
: static_cast<FloatType>(sprout::math::detail::log_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
log(IntType x) {
return sprout::math::log(static_cast<double>(x));
}
} // namespace math
using sprout::math::log;