def("username", 'u', required_argument, "SASL username.")
.apply = [](const client_options &opt, const extended_option &ext, memcached_st *memc) {
if (auto username = ext.arg) {
def("username", 'u', required_argument, "SASL username.")
.apply = [](const client_options &opt, const extended_option &ext, memcached_st *memc) {
if (auto username = ext.arg) {