Function signbit

dnn/include/megdnn/dtype/half.hpp:2672–2672

Check sign. \param arg number to check \retval true for negative number \retval false for positive number template typename enable ::type signbit(T arg) { return functions::signbit(arg); }

		/// \retval false for positive number
//		template<typename T> typename enable<bool,T>::type signbit(T arg) { return functions::signbit(arg); }
        MEGDNN_HOST MEGDNN_DEVICE inline bool signbit(half arg) { return functions::signbit(arg); }
        MEGDNN_HOST MEGDNN_DEVICE inline bool signbit(expr arg) { return functions::signbit(arg); }

		/// \}