【C++】正确使用虚析构函数

//正确使用虚析构函数
//使用虚析构函数，当delete删除一个对象时，能确保析构函数正确执行（动态）

#include <iostream>
using namespace std;
class B
{
public:
	B()
	{
		cout<<"B"<<endl;
	}
	virtual void fun()
	{
		cout<<"B::fun()"<<endl;
	}
	virtual ~B()
//	~B()     //若非虚析构函数，则会导致子类无法析构
	{
		cout<<"~B"<<endl;
	}
private:
	int x;
};

class D : public B
{
public:
	D()
	{
		cout<<"D"<<endl;
	}
	void fun()
	{
		cout<<"D::fun(int)"<<endl;
	}
	void show()
	{
		cout<<"D::show()"<<endl;
	}
	~D()
	{
		cout<<"~D"<<endl;
	}
private:
	int y;
};

void main()
{
	B *pb = new D;
	delete pb;
}
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