有段define代码没看懂

有段define代码没有看懂

  #define AOP(OP)                                 \

        void operator OP(T scalar)                      \

        {                                               \

            const int cx = Width();                     \

            const int cy = Height();                    \

            for (int y = 0; y < cy; y ++)               \

            {                                           \

                T* p = RowPtr(y);                       \

                for (int x = 0 ; x < cx; x ++)          \

                {                                       \

                    (*p++) OP scalar;                   \

                }                                       \

            }                                           \

        }                                               \


        /// Usage: Image *= scale;