prefix and postfix operator overloading in c++

struct X
{
    // prefix increment
    X& operator++()
    {
        // actual increment takes place here
        return *this; // return new value by reference
    }
 
    // postfix increment
    X operator++(int)
    {
        X old = *this; // copy old value
        operator++();  // prefix increment
        return old;    // return old value
    }
 
    // prefix decrement
    X& operator--()
    {
        // actual decrement takes place here
        return *this; // return new value by reference
    }
 
    // postfix decrement
    X operator--(int)
    {
        X old = *this; // copy old value
        operator--();  // prefix decrement
        return old;    // return old value
    }
};

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Dox 105 points

                                    class Point
{
public:
	Point&amp; operator++() { ... }		// prefix
	Point operator++(int) { ... }	// postfix
  	friend Point&amp; operator++(Point &amp;p);			// friend prefix
  	friend Point operator++(Point &amp;p, int);		// friend postfix
  	// in Microsoft Docs written &quot;friend Point&amp; operator++(Point &amp;p, int);&quot;
};

Thank you! 7

4 (7 Votes)

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