How to differentiate (when overloading) between prefix and postfix forms of operator++? (C++)

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http://www.devx.com/tips/Tip/12515

class Date {
    //...
    public:
    Date& operator++(); //prefix
    Date& operator--(); //prefix
    Date operator++(int unused); //postfix
    Date operator--(int unused); //postfix
};

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