sorted = xnmalloc (elem_cnt, sizeof *sorted);
memcpy (sorted, elements, elem_cnt * sizeof *elements);
qsort (sorted, elem_cnt, sizeof *sorted, compare_expected_element);
sorted = xnmalloc (elem_cnt, sizeof *sorted);
memcpy (sorted, elements, elem_cnt * sizeof *elements);
qsort (sorted, elem_cnt, sizeof *sorted, compare_expected_element);