如何在不交“朋友"的情况下访问类外的私有数据成员?

2021-12-09 00:00:00 class private encapsulation c++ data-members

我有一个 class A 如下所述:-

I have a class A as mentioned below:-

class A{ int iData; };

我既不想创建成员函数，也不想继承上面的class A，也不想改变iData的说明符.

I neither want to create member function nor inherit the above class A nor change the specifier of iData.

我的疑问:-

如何访问iData对象的obj1，它是class A的一个实例?
如何更改或操作对象obj1的iData?

How to access iData of an object say obj1 which is an instance of class A?

How to change or manipulate the iData of an object obj1?

注意:不要使用friend.

推荐答案

你不能.该成员是私有的，在课堂外不可见.这就是 public/protected/private 修饰符的全部意义.

You can't. That member is private, it's not visible outside the class. That's the whole point of the public/protected/private modifiers.

(虽然你可能会使用脏指针技巧，但我猜你会很快进入未定义的行为领域.)

(You could probably use dirty pointer tricks though, but my guess is that you'd enter undefined behavior territory pretty fast.)

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