Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Tombstones are a mechanism to detect dangling pointers that can appear in certain computer programming languages, e. g. C, C++ and assembly languages, and to act as a containment to their dangerous effects.A tombstone is a structure that acts as an intermediary between a pointer and the heap-dynamic data in memory. The pointer -- sometimes called the handle -- points only at tombstones and never to the memory that holds the actual value. When the data is deallocated, the tombstone is set to a null (or, more generally, to a value that is illegal for a pointer in the given runtime environment), indicating that the variable no longer exists.

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