:func:`memcached_set_memory_allocators` return `MEMCACHED_SUCCESS` upon success,
and `MEMCACHED_FAILURE` if you don't pass a complete set of function pointers.
:func:`memcached_set_memory_allocators` return `MEMCACHED_SUCCESS` upon success,
and `MEMCACHED_FAILURE` if you don't pass a complete set of function pointers.