memcached_return_t memcached_set_error(org::libmemcached::Instance&, memcached_return_t rc, const char *at, const char *str, size_t length);
memcached_return_t memcached_set_error(org::libmemcached::Instance&, memcached_return_t rc, const char *at, const char *str, size_t length);