Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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. Use of 0 to represent a null pointer is extremely common, with many programming languages (such as Ada) explicitly relying on this behavior. In theory, other values in an operating system-reserved block of logical memory could be used to tag conditions other than a null pointer, but these uses appear to be rare, perhaps because they are at best non-portable.

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