#include <libmemcached/memcached.h>
New in version 0.53.
Compile and link with -lmemcached
memcached_exist() can be used to check to see if a key exists. No value is returned if the key exists, or does not exist, on the server.
memcached_exist() sets error to to MEMCACHED_SUCCESS upon finding that the key exists. MEMCACHED_NOTFOUND will be return if the key is not found.
To find out more information please check: http://libmemcached.org/
memcached(1) libmemcached(3) memcached_strerror(3)