In an unsafe context, the ++ and --operators (14.5.9 and 14.6.5) can be applied to pointer variables of all types except void*. Thus, for every pointer type T*, the following operators are implicitly defined: The operators produce the same results as x+1 and x-1, respectively (25.5.6). In other words, for a pointer variable of type T*, the ++ operator adds sizeof(T) to the address contained in the variable, and the --operator subtracts sizeof(T) from the address contained in the variable. If a pointer increment or decrement operation overflows the domain of the pointer type, the result is implementation-defined, but no exceptions are produced.