Function isnan

include/half/half.hpp:2735–2735

Check for NaN. \param arg number to check \retval true for NaNs \retval false else template typename enable ::type isnan(T arg) { return functions::isnan(arg); }

		/// \retval false else
//		template<typename T> typename enable<bool,T>::type isnan(T arg) { return functions::isnan(arg); }
		inline bool isnan(half arg) { return functions::isnan(arg); }
		inline bool isnan(expr arg) { return functions::isnan(arg); }

		/// Check if normal number.