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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