The central idea of encapsulation and data hiding concept is that any non-member function has no access
permission to the private data of the class. The private members of the class are accessed only from member
functions of that class. Any non-member function cannot access the private data of the class.
C++ allows a mechanism, in which a non-member function has access permission to the private members
of the class. This can be done by declaring a non-member function friend to the class whose private data is to
be accessed. Here friend is a keyword. Consider the following ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.