-char *memcached_get_by_key(memcached_st *ptr,
- char *master_key, size_t master_key_length,
- char *key, size_t key_length,
- size_t *value_length,
- uint32_t *flags,
- memcached_return *error);
-
-memcached_return memcached_mget_by_key(memcached_st *ptr,
- char *master_key, size_t master_key_length,
- char **keys, size_t *key_length,
- unsigned int number_of_keys);
-
-memcached_return memcached_delete_by_key(memcached_st *ptr,
- char *master_key, size_t master_key_length,
- char *key, size_t key_length,
+LIBMEMCACHED_API
+memcached_return memcached_delete_by_key(memcached_st *ptr,
+ const char *master_key, size_t master_key_length,
+ const char *key, size_t key_length,