How can I pass the pointer of a static 2D array to a structure/class?

Question

I have a problem when I try to pass the pointer of an array (which contains parameters needed by some functions in my program) to a structure, which then should be passed to

Answer 1

double d[4][3]; is an array of arrays. double b**; is a pointer to pointer. These types are not the same (the common "arrays are just pointers" you might have read on the internet is wrong).

Elements of d are of type double[3]. Arrays, when passed around, decay to pointers to their first element (see section 4.2. of C++ standard). d will decay to double(*)[3] (a pointer to array of 3 doubles).

Long story short, double(*)[3] is not convertible to double** and this is what compiler is telling you.

If you need to keep d as it is, you need to declare b as double (*b)[3];

For more in-depth explanation, refer to this SO question.