Quote: a class member can be 'private', 'protected',or 'public'. Private members implement a class and protected members implement derived classes

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A member of a class can be 'private', … and friends of the class in which it … [in addition] by member functions and friends of classes … If it is 'public', its name can be … a class: functions implementing the class (its friends … , and other functions.   Google-1   Google-2

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