_copy_iter_cond (ira_copy_iterator *i, ira_copy_t *cp)
{
  int n;

  for (n = i->n; n < ira_copies_num; n++)
    if (ira_copies[n] != NULL)
      {
	*cp = ira_copies[n];
	i->n = n + 1;
	return true;
      }
  return false;
}

/* Loop over all copies.  In each iteration, C is set to the next
   copy.  ITER is an instance of ira_copy_iterator used to iterate
   the copies.  */
#define FOR_EACH_COPY(C, ITER)				\
  for (ira_copy_iter_init (&(ITER));			\
       ira_copy_iter_cond (&(ITER), &(C));)