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Class Scope
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The name M of a member of a class X has class scope “local to X”; it can be used only in the following situations:

- In member functions of X
- In expressions such as x.M, where x is an object of X
- In expressions such as xptr->M, where xptr is a pointer to an object of X
- In expressions such as X::M or D::M, where D is a derived class of X
- In forward references within the class of which it is a member

Names of functions declared as friends of X are not members of X; their names simply have enclosing scope.
See Also

C++ Scope

Hiding

C++ Scoping Rules Summary

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