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add math::copysign

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fix hyperbolic and exponental functions: for special values
This commit is contained in:
bolero-MURAKAMI 2013-04-24 22:48:36 +09:00
parent a27c83e939
commit 32c3ba02d4
50 changed files with 540 additions and 216 deletions
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30
sprout/math/log2.hpp
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@ -5,13 +5,21 @@
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/math/detail/config.hpp>
#include <sprout/math/detail/float_compute.hpp>
#include <sprout/math/log.hpp>
#include <sprout/math/constants.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#include <sprout/type_traits/float_promote.hpp>
namespace sprout {
namespace math {
namespace detail {
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
@ -19,13 +27,16 @@ namespace sprout {
inline SPROUT_CONSTEXPR FloatType
log2(FloatType x) {
return x == 0 ? -std::numeric_limits<FloatType>::infinity()
: x == 1 ? FloatType(0)
: x == std::numeric_limits<FloatType>::infinity() ? std::numeric_limits<FloatType>::infinity()
: x < 0 ? std::numeric_limits<FloatType>::quiet_NaN()
: sprout::log(x) / sprout::math::ln_two<FloatType>()
#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
@ -35,8 +46,17 @@ namespace sprout {
return sprout::math::detail::log2(static_cast<double>(x));
}
} // namespace detail
using NS_SPROUT_MATH_DETAIL::log2;
//
// log2
//
template<
typename ArithmeticType,
typename sprout::enabler_if<std::is_arithmetic<ArithmeticType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR typename sprout::float_promote<ArithmeticType>::type
log2(ArithmeticType x) {
return sprout::math::detail::log2(x);
}
} // namespace math
using sprout::math::log2;