how to overload operator == outside template class using friend function?

Question

I\'m trying to write a template class which overloads operator==. I know how to get it inside the class:

    template 
            


        

Answer 1

The declaration of the operator==() is a template. The declaration made a friend is not a template but a non-template. To make the template operator==() a friend you need to make the friend declaration a template, too:

template  class Point;

template 
bool operator== (Point, Point);

template 
class Point {
    // ...
    template 
    friend bool operator== (Point, Point);
};