memcached_return memcached_do(memcached_server_st *ptr, char *commmand,
size_t command_length, uint8_t with_flush);
memcached_return memcached_version(memcached_st *ptr);
memcached_return memcached_do(memcached_server_st *ptr, char *commmand,
size_t command_length, uint8_t with_flush);
memcached_return memcached_version(memcached_st *ptr);