Describes guidelines for implementing protected members.
描述实现受保护成员的准则。
These unions may not have member functions and may not have private or protected members.
这些联合不能具有成员函数,也不能具有私有或受保护成员。
Types declare protected members so that inheriting types can access or override the member.
类型声明受保护的成员,使继承类型可以访问或重写该成员。
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