MEMCACHED_EXIST_BY_KEY(3)

libmemcached-awesome

MEMCACHED_EXIST_BY_KEY(3)

NAME

memcached_exist_by_key - libmemcached Documentation

SYNOPSIS

#include <libmemcached/memcached.h>: Compile and link with -lmemcached

memcached_return_t <#_CPPv418memcached_return_t> memcached_exist(memcached_st <#_CPPv412memcached_st> *ptr, char *key, size_t *key_length)

memcached_return_t <#_CPPv418memcached_return_t> memcached_exist_by_key(memcached_st <#_CPPv412memcached_st> *ptr, char *group_key, size_t *group_key_length, char *key, size_t *key_length)

Parameters

ptr -- pointer to an initialized memcached_st <#_CPPv412memcached_st> struct
group_key -- the key namespace
group_key_length -- length of the group_key without any terminating zero
key -- the key to check
key_length -- length of the key without any terminating zero

Returns: memcached_return_t <#_CPPv418memcached_return_t> indicating success

Added in version 0.53.

DESCRIPTION

memcached_exist() can be used to check if a key exists.

RETURN VALUE

MEMCACHED_SUCCESS <#_CPPv4N18memcached_return_t17MEMCACHED_SUCCESSE>: The key exists.
MEMCACHED_NOTFOUND <#_CPPv4N18memcached_return_t18MEMCACHED_NOTFOUNDE>: The key was not found.

SEE ALSO

memcached(1) https://linux.die.net/man/1/memcached libmemcached(3) https://linux.die.net/man/3/libmemcached memcached_strerror(3) https://linux.die.net/man/3/memcached_strerror

March 7, 2026

1.1