Shulou(Shulou.com)06/03 Report--

This article mainly explains "C language and the introduction and function of derived class access attributes in C++", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn the introduction and function of the C language and the access properties of derived classes in C++.

Catalogue

Protect inheritance

Access properties of derived class members

Summary

Protect inheritance

Members declared by protected are called protected members, or protected members for short.

From the user's point of view, protected members are equivalent to private members. A protected member can be referenced by a member function of a derived class.

Access properties of derived class members

Four access attributes:

Common: in-class and out-of-class access

Protected: can be accessed within the class, not outside the class, and can be accessed by derived classes at the next level

Private: can be accessed within the class and not outside the class

Inaccessible: in-class and out-of-class access

Members in the base class access properties public inheritance (public) public members and protection members maintain the original access properties in the derived class public inheritance (public) private members are still private to the base class, derived classes are inaccessible private inheritance (private) public members and protected members are private members in the derived class private inheritance (private) private members are still private to the base class Derived class inaccessible protected inheritance (protected) public and protected members become protected members in a derived class protected inheritance (protected) private members are still private to the base class and derived classes are not accessible

Summary

If common inheritance is used in multi-level derivation, the common and protected members of the base class can be accessed until the last level of derived class.

If private inheritance is used, after several derivations, all members of the base class have become inaccessible

If you use vegetable inheritance, any member of the derived class cannot be accessed outside the derived class. And after many derivations, it is difficult for people to remember clearly which members can access and which members cannot, and it is easy to make mistakes.

Note: in actual development, we usually use public inheritance.

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