+ .. enumerator:: MEMCACHED_MAXIMUM_RETURN
+
+ This in an internal only state.
+
+ .. enumerator:: MEMCACHED_MEMORY_ALLOCATION_FAILURE
+
+ An error has occurred while trying to allocate memory.
+
+ .. enumerator:: MEMCACHED_NO_KEY_PROVIDED
+
+ .. deprecated:: <0.30
+ Use `MEMCACHED_BAD_KEY_PROVIDED` instead.
+
+ No key was provided.
+
+ .. enumerator:: MEMCACHED_NO_SERVERS
+
+ No servers have been added to the memcached_st object.
+
+ .. enumerator:: MEMCACHED_NOTFOUND
+
+ The object requested was not found.
+
+ .. enumerator:: MEMCACHED_NOTSTORED
+
+ The request to store an object failed.
+
+ .. enumerator:: MEMCACHED_NOT_SUPPORTED
+
+ The given method is not supported in the server.
+
+ .. enumerator:: MEMCACHED_PARSE_ERROR
+
+ An error has occurred while trying to parse the configuration string. You should use memparse to determine what the error was.
+
+ .. enumerator:: MEMCACHED_PARSE_USER_ERROR
+
+ An error has occurred in parsing the configuration string.
+
+ .. enumerator:: MEMCACHED_PARTIAL_READ
+
+ The read was only partially successful.
+
+ .. enumerator:: MEMCACHED_PROTOCOL_ERROR
+
+ An unknown error has occurred in the protocol.
+
+ .. enumerator:: MEMCACHED_READ_FAILURE
+
+ A read failure has occurred.
+
+ .. enumerator:: MEMCACHED_SERVER_ERROR
+
+ An unknown error has occurred in the server.
+
+ .. enumerator:: MEMCACHED_SERVER_MARKED_DEAD
+
+ The requested server has been marked dead.
+
+ .. enumerator:: MEMCACHED_SOME_ERRORS
+
+ A multi request has been made, and some undetermined number of errors have occurred.
+
+ .. enumerator:: MEMCACHED_STAT
+
+ A "stat" command has been returned in the protocol.
+
+ .. enumerator:: MEMCACHED_STORED
+
+ The requested object has been successfully stored on the server.
+
+ .. enumerator:: MEMCACHED_SUCCESS
+
+ The request was successfully executed.
+
+ .. enumerator:: MEMCACHED_TIMEOUT
+
+ Operation has timed out.
+
+ .. enumerator:: MEMCACHED_UNKNOWN_READ_FAILURE
+
+ An unknown read failure only occurs when either there is a bug in the server, or in rare cases where an ethernet nic is reporting dubious information.
+
+ .. enumerator:: MEMCACHED_UNKNOWN_STAT_KEY
+
+ The server you are communicating with has a stat key which has not be defined in the protocol.
+
+ .. enumerator:: MEMCACHED_VALUE
+
+ A value has been returned from the server (this is an internal condition only).
+
+ .. enumerator:: MEMCACHED_WRITE_FAILURE
+
+ An error has occurred while trying to write to a server.