Question

I would like to override operator * for my class. I know how to handle * for MyClass * MyClass but how can i implement this for having possibility to multiply for example:

7 * MyClass

7 is lets say double and MyClass is object of MyClass,

thanks for help

Answer 1

When you provide an operator for your class, the parameter types for the operator implementation control which situations you’re handling.

To illustrate:

// Declare which operator to overload (+), the types 
// that can be added (two Complex objects), and the 
// return type (Complex):
public static Complex operator +(Complex c1, Complex c2) 
{
   return new Complex(c1.real + c2.real, c1.imaginary + c2.imaginary);
}

This method defines what to do if you want to add two Complex numbers.

If you tried to use this with (say) a double and a Complex, compilation would fail.

In your case, you need just declare both versions:

public static MyClass operator *(MyClass c1, MyClass c2) 
{
   return ...
}

public static MyClass operator *(double n, MyClass c) 
{
   return ...
}