在Bjarne第三版的书中，1.3节中说明了：A C++ nested class does not have access to an object of the enclosing class.

然而在16.2.13中又写到：
A member class (often called a nested class) can refer to types and static members of its enclosing class. It can only refer to non-static members when it is given an object of the enclosing class to refer to. To avoid getting into the intricacies of binary trees, I use purely technical ‘‘f() and g()’’-style examples.
A nested class has access to members of its enclosing class, even to private members (just as a member function has), but has no notion of a current object of the enclosing class.

今天早上我先是被AI给绕晕了，接着我又把AI给绕晕了
```cpp
class Encloser {
private:
  struct PrivateType {/* many code here */};
  class Nester {
   public:
    inline const PrivateType& Show() { return member_; }
   private:
    PrivateType member_;
};
};
```
这段代码请各位评析一下是否可以？
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