Question 48: In C++, which of the following statements accurately describe a base class destructor calling a virtual function ov

rommi

于 2010-12-03 10:57:00 发布

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本文探讨了C++中基类析构函数调用派生类虚函数的问题。解析了为何基类析构函数不能调用处于不确定状态的派生类虚函数覆盖，并讨论了C++编译器如何维护虚函数指针。

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A. The base class destructor calls the virtual function override of the derived class through the vtable.

B. The base class destructor cannot call the virtual function override of the derived class because the derived class portion of the data may be in an undefined state.

C. The base class destructor calls the virtual function of the base class and not of the derived class.

D. The C++ compiler maintains the overridden virtual function pointers in a separate structure when it sees the call in a destructor. The call is then resolved through this structure.

E. The language does not permit calling a virtual function override in either a constructor or the destructor of the base class.

B C