-skiplist_t *sl_alloc (const datatype_t *key_type);
-uint64_t sl_cas (skiplist_t *sl, void *key, uint64_t expected_val, uint64_t new_val);
-uint64_t sl_lookup (skiplist_t *sl, void *key);
-uint64_t sl_remove (skiplist_t *sl, void *key);
-uint64_t sl_count (skiplist_t *sl);
-void sl_print (skiplist_t *sl);
-void sl_free (skiplist_t *sl);
+skiplist_t * sl_alloc (const datatype_t *key_type);
+map_val_t sl_cas (skiplist_t *sl, map_key_t key, map_val_t expected_val, map_val_t new_val);
+map_val_t sl_lookup (skiplist_t *sl, map_key_t key);
+map_val_t sl_remove (skiplist_t *sl, map_key_t key);
+size_t sl_count (skiplist_t *sl);
+void sl_print (skiplist_t *sl);
+void sl_free (skiplist_t *sl);
+map_key_t sl_min_key (skiplist_t *sl);
+
+sl_iter_t * sl_iter_begin (skiplist_t *sl, map_key_t key);
+map_val_t sl_iter_next (sl_iter_t *iter, map_key_t *key_ptr);
+void sl_iter_free (sl_iter_t *iter);