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Description 

Friends Of Classes 

A friend F of a class X is a function or class, although not a member function of X, with full access rights to the private and protected members of X. In all other respects, F is a normal function with respect to scope, declarations, and definitions.
Since F is not a member of X, it is not in the scope of X, and it cannot be called with the x.F and xptr->F selector operators (where x is an X object and xptr is a pointer to an X object).
If the specifier friend is used with a function declaration... more