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operator Overloading in C#

class Point
{
    private int m_PointX;
    private int m_PointY;

    public Point(int x, int y)
    {
        m_PointX = x;
        m_PointY = y;
    }

    public static Point operator+(Point point1, Point point2)
    {
        Point P = new Point();
        P.X = point1.X + point2.X;
        P.Y = point1.Y + point2.Y;

        return P;
    }
}

Example:

Point P1 = new Point(10,20);
Point P2 = new Point(30,40)
P1+P2; // operator overloading
  1. Is it necessary to always declare the operator overloading function as static? What is the reason behind this?
  2. If I want to overload + to accept the expression like 2+P2, how to do this?
like image 530
Raghav55 Avatar asked May 11 '11 15:05

Raghav55


2 Answers

  1. Yes. Because you aren't dealing with instances always with the operators.
  2. Just change the types to what you want.

Here is an example for #2

public static Point operator+(int value, Point point2)
{
 // logic here.
}

You will have to do the other way with the parameters if you want P2 + 2 to work.

See http://msdn.microsoft.com/en-us/library/8edha89s.aspx for more information.

like image 176
Daniel A. White Avatar answered Nov 19 '22 17:11

Daniel A. White


To answer your questions:

  1. Yes, you need to define them as static. They're not instance methods, they can operate on nulls as well.
  2. You'll have to define an operator overload where one of the parameters are of type int
like image 4
Lasse V. Karlsen Avatar answered Nov 19 '22 17:11

Lasse V. Karlsen