C++ - Operator Overloading

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Here is the sample code for operator overloading.

I have overloaded the following three operators for the class MyValueClass.
1. operator = (assignment)
2. operator += (plus equal to)
3. operator + (plus)

I have overloaded assignment operator and operator += in the begining. You can see two implementation for binary arithmatic operator +. One with using the existing += operator and another one with out using += operator.

Source Code

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class MyValueClass {

 

public:

    int a;

    int b;

 

public:

 

    MyValueClass() { };

 

    MyValueClass(int v1, int v2) : a(v1), b(v2) { };

 

    MyValueClass(const MyValueClass& other)

    {

        this->a = other.a;

        this->b = other.b;

    }

 

    const MyValueClass& operator = (const MyValueClass& other)

    {

        this->a = other.a;

        this->b = other.b;

        return *this;

    }

 

    MyValueClass& operator += (const MyValueClass& other)

    {

        this->a += other.a;

        this->b += other.b;

        return *this;

    }

 

    const MyValueClass operator + (const MyValueClass& other) const

    {

        MyValueClass m;

        m.a = this->a + other.a;

        m.b = this->b + other.b;

        return m;

    }

    /*

    // This is an alternate implementation for operator + using the operator +=

    const MyValueClass operator + (const MyValueClass& other) const

    {

        MyValueClass m = *this;

        m += other; // calling operator += , same as m.operator += (other);

        return m;

    }

    */

};

 

void main()

{

    MyValueClass Obj1(5,10);

    MyValueClass Obj2(15,20);

    MyValueClass Obj3(25,30);

 

    MyValueClass Obj4 = Obj1 + Obj2 + Obj3;

 

    Obj2 += Obj3;

 

    std::cout << "The value of Obj4 = " << Obj4.a << ", " << Obj4.b << "\n";

    std::cout << "The value of Obj2 = " << Obj2.a << ", " << Obj2.b << "\n";

}

Output

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The value of Obj4 = 45, 60
The value of Obj5 = 40, 50

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