In computer science, a tagged pointer is a common example of a tagged union, where the primary type of data to be stored in the union is a pointer.

... the use of reserved values, where, for example, a function returning a positive number may return -1 to indicate failure, and sentinel values, most often used in tagged pointers.

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GOODS assumes that static type information is available, and so distinguishes between reference fields and immediate fields. In Smalltalk, of course, the same field could hold a ...

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