How Non-Member Functions Improve Encapsulation

Question

I read Scott Meyers\' article on the subject and quite confused about what he is talking about. I have 3 questions here.

Question 1

To expl

Answer 1

He specifically says "non-member non-friend functions" (emphasis mine). If you would need to make the non-member function a fiend his algorithms says it should be a member function unless it's operator>> or operator<< or needs type conversions on its left-most argument.