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
    }
};

Posted by: Guest on May-05-2021

Source

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

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