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

Question : 2

Scott Meyers has also suggested following thing if u remember :

--> Keep the class interface complete and minimal.

See following scenario :

class Person {

private: string name;

         unsigned int age;

         long salary;

public:

       void setName(string);// assme the implementation

       void setAge(unsigned int); // assme the implementation

       void setSalary(long sal); // assme the implementation

       void setPersonData()
       {
           setName("Scott");
           setAge(25);
           selSalary(50000);
        }
}

here setPersonData() is member function but ultimately what its doing can also be achieved by making it non - member function like this and it will keep interface of class minimal and does not bloat class with plenty of member function unnecessarily .

   void setPersonData(Person &p) 
   {           
       p.setName("Scott");
       p.setAge(25);
       p.selSalary(50000);
    }