Defines a two dimensional array class and its functionality. Also derives a one dimensional array class from a 2-D array. Array_2D class is the base class for other derived classes such as Matrix, Vector, and Image classes. Array_2D class allocates carries out matrix indexing and some basic operations such as == comparsions. This class requires and guarantees that the elements are contiguous (but not necessarily the memory allocated inside each element).-Defines a two dimensional array class and its functionality. Also derives a one dimensional array class from a 2-D array. Array_2D class is the base class for other derived classes such as Matrix, Vector, and Image classes.　Array_2D class allocates carries out matrix indexing and some basic operations such as == comparsions. This class requires and guarantees that the elements are contiguous (but not necessarily the memory allocated inside each element).