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fix math: rounding function,etc...

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bolero-MURAKAMI 2013-02-10 11:54:54 +09:00
parent 53b99b25f8
commit 434aa8d3c5
22 changed files with 812 additions and 74 deletions
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71
sprout/math/ilogb2.hpp Normal file
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#ifndef SPROUT_MATH_ILOGB2_HPP
#define SPROUT_MATH_ILOGB2_HPP
#include <climits>
#include <cfloat>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/math/detail/config.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#if SPROUT_FLT_RADIX_IS_2
# include <sprout/math/ilogb.hpp>
#else
# include <sprout/math/logb2.hpp>
# include <sprout/math/isnan.hpp>
# include <sprout/math/isinf.hpp>
# include <sprout/math/iszero.hpp>
#endif
namespace sprout {
namespace math {
namespace detail {
#if SPROUT_FLT_RADIX_IS_2
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR int
ilogb2(FloatType x) {
return sprout::math::ilogb(x);
}
template<
typename IntType,
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR int
ilogb2(IntType x) {
return sprout::math::ilogb(x);
}
#else
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR int
ilogb2(FloatType x) {
return sprout::math::iszero(x) ? FP_ILOGB0
: sprout::math::isinf(x) ? INT_MAX
: sprout::math::isnan(x) ? FP_ILOGBNAN
: static_cast<int>(sprout::math::logb2(x))
;
}
template<
typename IntType,
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR int
ilogb2(IntType x) {
return sprout::math::detail::ilogb2(static_cast<double>(x));
}
#endif
} // namespace detail
using sprout::math::detail::ilogb2;
} // namespace math
using sprout::math::ilogb2;
} // namespace sprout
#endif // #ifndef SPROUT_MATH_ILOGB2_HPP