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..C++ offers even more flexible control over the visibility of member objects and member functions. Specifically, members may be placed in the public, private, or protected parts of a class. Members declared in the public parts are visible to all clients; members declared in the private parts are fully encapsulated; and members declared in the protected parts are visible only to the class itself and its subclasses. C++ also supports the notion of *friends*: cooperative classes that are permitted to see each other's private parts. - Grady Booch, Object Oriented Design with Applications
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