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.TH "MEMCACHED_EXIST_BY_KEY" "3" "Mar 07, 2026" "1.1" "libmemcached-awesome"
.SH NAME
memcached_exist_by_key \- libmemcached Documentation
.SH SYNOPSIS
.INDENT 0.0
.TP
.B #include <libmemcached/memcached.h>
Compile and link with \-lmemcached
.UNINDENT
.INDENT 0.0
.TP
.B memcached_return_t \%<#\:_CPPv418memcached_return_t> memcached_exist(memcached_st \%<#\:_CPPv412memcached_st> *ptr, char *key, size_t *key_length) 
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.TP
.B 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) 
.INDENT 7.0
.TP
.B Parameters
.INDENT 7.0
.IP \(bu 2
\fBptr\fP \-\- pointer to an initialized \fBmemcached_st\fP \%<#\:_CPPv412memcached_st> struct
.IP \(bu 2
\fBgroup_key\fP \-\- the key namespace
.IP \(bu 2
\fBgroup_key_length\fP \-\- length of the \fBgroup_key\fP without any terminating zero
.IP \(bu 2
\fBkey\fP \-\- the key to check
.IP \(bu 2
\fBkey_length\fP \-\- length of the \fBkey\fP without any terminating zero
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.TP
.B Returns
\fBmemcached_return_t\fP \%<#\:_CPPv418memcached_return_t> indicating success
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.UNINDENT
.sp
Added in version 0.53.

.SH DESCRIPTION
.sp
\fBmemcached_exist()\fP can be used to check if a key exists.
.SH RETURN VALUE
.INDENT 0.0
.TP
.B \fBMEMCACHED_SUCCESS\fP \%<#\:_CPPv4N18memcached_return_t17MEMCACHED_SUCCESSE>
The key exists.
.TP
.B \fBMEMCACHED_NOTFOUND\fP \%<#\:_CPPv4N18memcached_return_t18MEMCACHED_NOTFOUNDE>
The key was not found.
.UNINDENT
.SH SEE ALSO
.sp
\fBmemcached(1) \%<https://\:linux\:.die\:.net/\:man/\:1/\:memcached>\fP
\fBlibmemcached(3) \%<https://\:linux\:.die\:.net/\:man/\:3/\:libmemcached>\fP
\fBmemcached_strerror(3) \%<https://\:linux\:.die\:.net/\:man/\:3/\:memcached_strerror>\fP
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