Overloading the Postfix Increment Operator
Overloading the postfix increment operator presents a challenge, because the compiler must be able to distinguish between the signatures of the overloaded prefix and postfix increment operator functions. The convention that has been adopted is that, when the compiler sees the postincrementing expression
d1++, it generates the member-function call
d1.operator++( 0 )
The prototype for this operator member function is
Date operator++( int )
0 is strictly a dummy value that enables the compiler to distinguish between the prefix and postfix increment operator functions. The same syntax is used to differentiate between the prefix and postfix decrement operator functions.
If the postfix increment ...