+memcached_return memcached_delete_by_key(memcached_st *ptr,
+ char *master_key, size_t master_key_length,
+ char *key, size_t key_length,
+ time_t expiration);
+
+memcached_return memcached_fetch_execute(memcached_st *ptr,
+ unsigned int (*callback[])(memcached_st *ptr, memcached_result_st *result, void *context),
+ void *context,
+ unsigned int number_of_callbacks
+ );
+
+memcached_return memcached_callback_set(memcached_st *ptr,
+ memcached_callback flag,
+ void *data);
+void *memcached_callback_get(memcached_st *ptr,
+ memcached_callback flag,
+ memcached_return *error);