friend function of a class

Can I make a funct开发者_JAVA百科ion that is not member of any class be a friend of a class?If so could someone point me out to the syntax? I used this page as reference .On that it only has a function that is part of another class being made a friend.

Yes, you can. The syntax for this should be obvious from the example you pointed out:

friend return_type free_function(args);