+#define memcached_instance_response_increment(A) (A)->cursor_active++
+#define memcached_instance_response_decrement(A) (A)->cursor_active--
+#define memcached_instance_response_reset(A) (A)->cursor_active=0
+
+bool memcached_purge(memcached_server_write_instance_st ptr);
+
+struct memcached_instance_st* memcached_instance_by_position(const memcached_st *ptr, uint32_t server_key);