olemus
struktuur, mis vahendab viita ja dünaamilisi andmeid, viidavigade tõrjeks programmeerimisel
= a structure that acts as an intermediary between a pointer and its target

ülevaateid
https://en.wikipedia.org/wiki/Tombstone_(programming)
https://oberoidearsh.medium.com/dangling-pointers-tombstones-and-lock-and-keys-f6bd0791810f