+ rc= memcached_cas(memc, key, key_length,
+ "change the value", strlen("change the value"),
+ 0, 0, memcached_result_cas(results));
+
+ assert(rc == MEMCACHED_SUCCESS);
+
+ rc= memcached_cas(memc, key, key_length,
+ "change the value", strlen("change the value"),
+ 0, 0, 23);
+
+ assert(rc == MEMCACHED_DATA_EXISTS);
+
+