Sprout/sprout/math/isnan.hpp
2012-05-27 00:43:38 +09:00

34 lines
785 B
C++

#ifndef SPROUT_MATH_ISNAN_HPP
#define SPROUT_MATH_ISNAN_HPP
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
# include <cmath>
#endif
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 int
isnan(FloatType x) {
return !(x == x);
}
} // namespace detail
# if SPROUT_USE_BUILTIN_CMATH_FUNCTION
using std::isnan;
# else
using sprout::math::detail::isnan;
# endif
} // namespace math
using sprout::math::isnan;
} // namespace sprout
#endif // #ifndef SPROUT_MATH_ISNAN_HPP