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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/log2.hpp
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@ -21,41 +21,56 @@
namespace sprout {
namespace math {
namespace detail {
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
inline SPROUT_CONSTEXPR float
builtin_log2(float x) {
return __builtin_log2f(x);
}
inline SPROUT_CONSTEXPR double
builtin_log2(double x) {
return __builtin_log2(x);
}
inline SPROUT_CONSTEXPR long double
builtin_log2(long double x) {
return __builtin_log2l(x);
}
#endif
template<typename T>
inline SPROUT_CONSTEXPR T
log2_impl(T x) {
return sprout::math::log(x) / sprout::math::ln_two<T>();
}
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
log2(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::log2(x)
#else
: x == 1 ? FloatType(0)
: static_cast<FloatType>(sprout::math::detail::log2_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
log2(IntType x) {
return sprout::math::detail::log2(static_cast<double>(x));
}
} // namespace detail
using sprout::math::detail::log2;
//
// log2
//
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
log2(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_log2(x)
#else
: x == 1 ? FloatType(0)
: static_cast<FloatType>(sprout::math::detail::log2_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
log2(IntType x) {
return sprout::math::log2(static_cast<double>(x));
}
} // namespace math
using sprout::math::log2;