MATLAB C++ Math Library Reference

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An array (a matrix is a special case) has two sizes: the number of its dimensions
(for matrices, always two) and the actual size of each dimension. You can use
these Size() functions to determine both the number of dimensions and the
size of each dimension.
int32 Size() const
Return the number of dimensions. In this version of the library, this function
always returns two.
int32 Size(int32 dim) const
Return the size (number of elements) of the indicated dimension. The integer
argument to this function must be either 1 or 2.
int32 Size(int32* dims, int maxdims=2) const
Determine the sizes of all the dimensions of the array and return them via the
given integer array, dims. maxdims is the maximum number of dimensions the
function should return. The input integer array dims must contain enough
space to store at least maxdims integers. If maxdims is less than the number of
dimensions of the mwArray, the last dimension returned is the product of the
remaining dimensions. This function’s return value is the number of
dimensions of the mwArray.