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===========================
Determine if a keys exists.
===========================
.. index:: object: memcached_st
--------
SYNOPSIS
--------
#include <libmemcached/memcached.h>
.. c:function:: memcached_return_t memcached_exist(memcached_st *ptr, char *key, size_t *key_length)
.. c:function:: memcached_return_t memcached_exist_by_key(memcached_st *ptr, char *group_key, size_t *group_key_length, char *key, size_t *key_length)
.. versionadded:: 0.53
Compile and link with -lmemcached
-----------
DESCRIPTION
-----------
:c:func:`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.
------
RETURN
------
:c:func:`memcached_exist()` sets error to
to :c:type:`MEMCACHED_SUCCESS` upon finding that the key exists.
:c:type:`MEMCACHED_NOTFOUND` will be return if the key is not found.
----
HOME
----
To find out more information please check:
`http://libmemcached.org/ <http://libmemcached.org/>`_
--------
SEE ALSO
--------
:manpage:`memcached(1)` :manpage:`libmemcached(3)` :manpage:`memcached_strerror(3)`
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