虚析构函数

#include <iostream>

using namespace std;

class A
{
public:
A() { cout << "构造A!" << endl; };
~A() { cout << "析构A!" << endl; };

virtual void DoSomething() { cout << "A的DoSomething!" << endl; };
};

class B : public A
{
public:
B() { cout << "构造B!" << endl; };
~B() { cout << "析构B!" << endl; };

void DoSomething() { cout << "B的DoSomething!" << endl; };
};

int main()
{
A *Test1 = new A;
cout << "**************" << endl;
Test1->DoSomething();
cout << "**************" << endl;
delete Test1;
cout << "**************" << endl;
B *Test2 = new B;
cout << "**************" << endl;
Test2->DoSomething();
cout << "**************" << endl;
delete Test2;
cout << "**************" << endl;
A *Test3 = new B;
cout << "**************" << endl;
Test3->DoSomething();
cout << "**************" << endl;
delete Test3;
return 0;
}

B b;