派生类是否被视为朋友？ [英] Are derived classes considered friends?

问题描述

如果我创建基类A而A是B类的朋友，那么一个类可以从A访问B派生出来，或者它允许什么？

谢谢

解决方案

  struct A {}; 
 
 struct Ader：A {}; 
 
 struct B {
 friend struct A; 
}; 
  

不。友谊不是在C ++中继承的。它也不具有传递性。

Ader 无法访问 B 作为朋友，除非B明确给予友谊，只因为它的基础 A 是 B 的朋友。 / p>

If I create base class A and A is a friend of class B, can a class derived from A access B to its liking, or else what is it allowed?

Thanks

解决方案

struct A{};

struct Ader : A{};

struct B{
   friend struct A;
};

No. Friendship is not inherited in C++. It is also not transitive.

Ader can not access B as a friend unless explicitly given friendship by B, just because it's base A is a friend of B.

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