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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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70
sprout/math/scalbn.hpp
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@ -20,37 +20,57 @@
namespace sprout {
namespace math {
namespace detail {
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
inline SPROUT_CONSTEXPR float
builtin_scalbn(float x, int exp) {
return __builtin_scalbnf(x, exp);
}
inline SPROUT_CONSTEXPR double
builtin_scalbn(double x, int exp) {
return __builtin_scalbn(x, exp);
}
inline SPROUT_CONSTEXPR long double
builtin_scalbn(long double x, int exp) {
return __builtin_scalbnl(x, exp);
}
#endif
template<typename FloatType, typename T>
inline SPROUT_CONSTEXPR T
scalbn_impl(T x, int exp) {
return x * sprout::detail::pow_n(T(sprout::numeric_limits<FloatType>::radix), exp);
}
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
scalbn(FloatType x, int exp) {
return sprout::math::isnan(x) ? x
: x == sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
: x == -sprout::numeric_limits<FloatType>::infinity() ? -sprout::numeric_limits<FloatType>::infinity()
: exp == 0 ? x
: x == 0 ? x
: static_cast<FloatType>(sprout::math::detail::scalbn_impl<FloatType>(static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x), exp))
;
}
template<
typename IntType,
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR double
scalbn(IntType x, int exp) {
return sprout::math::detail::scalbn(static_cast<double>(x), exp);
}
} // namespace detail
using NS_SPROUT_MATH_DETAIL::scalbn;
//
// scalbn
//
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
scalbn(FloatType x, int exp) {
return
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
sprout::math::detail::builtin_scalbn(x, exp)
#else
sprout::math::isnan(x) ? x
: x == sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
: x == -sprout::numeric_limits<FloatType>::infinity() ? -sprout::numeric_limits<FloatType>::infinity()
: exp == 0 ? x
: x == 0 ? x
: static_cast<FloatType>(sprout::math::detail::scalbn_impl<FloatType>(static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x), exp))
#endif
;
}
template<
typename IntType,
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR double
scalbn(IntType x, int exp) {
return sprout::math::scalbn(static_cast<double>(x), exp);
}
} // namespace math
using sprout::math::scalbn;