Overloading Friend Operator

When trying to overload the

In the provided code, the friend declaration for the

friend ostream& operator<<(ostream&, Pair<T,U>&);

However, the compiler recommends adding brackets to the function name, indicating that it should be declared as a template function. The correct syntax is:

friend ostream& operator<< <> (ostream&, Pair<T,U>&);

This declares the

Remember, the template function declaration should also be placed before the Pair class template definition to ensure that the compiler is aware of the template function when parsing the friend declaration. The corrected code with the correct friend declaration and template function declaration:

template <class T, class U> class Pair;

template <class T, class U>
ostream& operator<< <> (ostream&, Pair<T,U>&);

// Pair template class definition...