Thread: Overloaded << operator

Quick question. If I have a method to overload the << operator:
Header:

Code:

ostream& operator <<(ostream &os, const Set &s);

In the cpp:

Code:

ostream& operator <<(ostream &os, const Set &s)
{
       //print to a file
}

Is this the correct way to do this? I have checked around and it says it's the right way to do it but I am still getting errors.