Arithmetic on void- and Function-Pointers

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Arithmetic on void- and function-pointers

In GNU C, addition and subtraction operations are supported on pointers to void and on pointers to functions. This is done by treating the size of a void or of a function as 1.

A consequence of this is that sizeof is also allowed on void and on function types, and returns 1. The option, ‘-Wpointer-arith’, requests a warning if these extensions are used.