解析C++中虚析构函数的作用

class ClxBase
{
public:
    ClxBase() {};
    virtual ~ClxBase() {};
    virtual void DoSomething() { cout << "Do something in class ClxBase!" << endl; };
};
class ClxDerived : public ClxBase
{
public:
    ClxDerived() {};
    ~ClxDerived() { cout << "Output from the destructor of class ClxDerived!" << endl; };
    void DoSomething() { cout << "Do something in class ClxDerived!" << endl; };
};

ClxBase *pTest = new ClxDerived;
pTest->DoSomething();
delete pTest;