Pass By Reference Multidimensional Array With Unknown Size

Question

How to pass by reference multidimensional array with unknown size in C or C++?

EDIT:

For example, in main function I have:

int main(){
    int          


        

Answer 1

This is a sort of comment to the good answer of @John Bode

This will not work (or at least, not be guaranteed to work) for dynamically allocated arrays of the form:

But this variant will:

T **ap = malloc( M * sizeof *ap );
if (ap) return NULL;     ---> some error atention
if (ap)
{
  ap[0] = malloc( M * N * sizeof *ap[i] );
  if (ap[0]) { free(ap); return NULL;}     ---> some error atention
  size_t i;
  for (i = 1; i < M; i++)
  {
    ap[i] = ap[0] + i * N;
  }
}

After use :

free(ap[0]);
free(ap);

for T being int you call foo exactly als for the array int ap[M][N];

  foo( &ap[0][0], M, N);

since you guaranteed that all the rows are allocated contiguously to each other. This allocation is a litter more efficient.