Passing a pointer representing a 2D array to a function in C++

Question

http://www.neilstuff.com/guide_to_cpp/notes/Multi%20Dimension%20Arrays%20and%20Pointer%20Pointers.htm

According to this site, I should be able to use the following c

Answer 1

In addition to Cubbi's detailed answer, the following way is just natural to pass a 2-dim array to a function:

void dostuff(void *a1, int rows, int cols)
{
    double (*a)[cols] = (double (*)[cols]) a1;
    // access them as a[0][0] .. a[rows-1][cols-1];
}
int main()
{
    double stuff[3][3];
    dostuff(stuff, 3, 3);
}

You don't have to cast them in advance since the newest C++ (C++14) supports run-time sized arrays.