dangling pointer

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From The Free On-line Dictionary of Computing: (http://www.foldoc.org/, Editor Denis Howe)

A reference that doesn't actually lead anywhere. In C and some other languages, a pointer that doesn't actually point at anything valid. Usually this happens because it formerly pointed to something that has moved or disappeared, e.g. a heap-allocated block which has been freed and reused.

Used as jargon in a generalisation of its technical meaning; for example, a local phone number for a person who has since moved is a dangling pointer.

[Jargon File]

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