static const map_impl_t *map_types[] = { &ll_map_impl, &sl_map_impl, &ht_map_impl };
for (int i = 0; i < sizeof(map_types)/sizeof(*map_types); ++i) {
static const map_impl_t *map_types[] = { &ll_map_impl, &sl_map_impl, &ht_map_impl };
for (int i = 0; i < sizeof(map_types)/sizeof(*map_types); ++i) {