Problem with overloading operator+

Question

Hello. I wrote the code below: public static Point operator +(Point p1, Point p2) { return new Point(p1.X + p2.X, p1.Y + p2.Y); } But Creates error below on "operator+" : One of the parameters of a binary operator must be the containing type What's the problem? Thanks.

Sam Hobbs · Answer

" If operator function be one of its member functions, we don't need to inherit a class from it. " That is not the way that most object-oriented languages work. In C# you can create Extension methods; look at the documentation of those.

Majid Kamali · Answer

If operator function be one of its member functions, we don't need to inherit a class from it.

Kirtan Patel · Answer

if you dont inherit then how would you extend its functionality ?

Majid Kamali · Answer

for overloading an operator why should we inherit a class from it ?

Kirtan Patel · Answer

Point is a Struct Not Class you cannot inherit Struct .

Majid Kamali · Answer

I talk about predefined class Point. I don't want to modify it's private members. I just want to create a new point and add new X and Y to it's members.

Kirtan Patel · Answer

which class you are talking about ?it depends upon the class weather it allow you take control of its private variable or not . if it allows then you can inherit it and can overload operator in that derived class Hope it helps you :)

Majid Kamali · Answer

Thanks. But Can I overload an operator for a predefined class ? If yes, Why it Creates Error ?

Kirtan Patel · Answer

Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} do check " Do you like this answer " checkbox if it helps you :) class CartsianPoint { private int x; private int y; public CartsianPoint() { } public CartsianPoint( int x, int y) { this .x = x; this .y = y; } public static CartsianPoint operator +( CartsianPoint p1, CartsianPoint p2) { CartsianPoint temp = new CartsianPoint (p1.X+p2.X,p1.Y+p2.Y); return temp; } public int X { get { return x;} set {x = value ;} } public int Y { get { return y; } set { y = value ; } } } I used like below in Main Method Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} static void Main( string [] args) { CartsianPoint p1 = new CartsianPoint (10,10); CartsianPoint p2 = new CartsianPoint (20, 20); CartsianPoint result = p1 + p2; Console .WriteLine( "p3 X:=" + result.X+ " and p3 Y=" +result.Y); Console .ReadKey(); }