How to store in-class members in shared memory?

how to store an element in a class into shared memory? I don"t want to store the entire class instance in shared memory. I just want to store one of its member variables. Ask for advice

Shared-memory cPP
Sep.27,2021

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b30ac5-2b57e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b30ac5-2b57e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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