Sprout/sprout/math/issubnormal.hpp
2013-08-07 00:15:09 +09:00

45 lines
1.2 KiB
C++

#ifndef SPROUT_MATH_ISSUBNORMAL_HPP
#define SPROUT_MATH_ISSUBNORMAL_HPP
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/limits.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#include <sprout/math/iszero.hpp>
#include <sprout/math/isnan.hpp>
namespace sprout {
namespace math {
namespace detail {
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR bool
issubnormal_or_zero(FloatType x) {
return x > 0
? x < sprout::numeric_limits<double>::min()
: x > -sprout::numeric_limits<double>::min()
;
}
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR bool
issubnormal(FloatType x) {
return !sprout::math::isnan(x)
&& !sprout::math::iszero(x)
&& sprout::math::detail::issubnormal_or_zero(x)
;
}
} // namespace detail
using sprout::math::detail::issubnormal;
} // namespace math
using sprout::math::issubnormal;
} // namespace sprout
#endif // #ifndef SPROUT_MATH_ISSUBNORMAL_HPP