Question

why c# not allowed operator overloading while C++ do?

I got this error, when trying to overload.

Overloadable binary operator expected

My sample code looks like,

public static MyClass operator +=(MyClass obj1, MyClass obj2)
        {
           ...
        }

Answer 1

You can overload operators in C#:

• MSDN Tutorial

Before you decide to use operator overloading, please read at the very least, the following:

• Criticisms of Operator Overloading

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EDIT in response to op’s edit:

The += is a non-overloadable operator. However, it resolves to +, and + is overloadable. Have a look here for which operators you can and can not overload.

Operators that can be overloaded:

+, -, !, ~, ++, --, true, false

+, -, *, /, %, &, |, ^, <<, >>

==, !=, <, >, <=, >= (The comparison operators can be overloaded but see note in link)