/learn/test/virtual.destructor.cc

/*
 *--------------------------------------------------------------------------
 *   File Name:	virtual.destructor.cc
 * 
 *      Author:	Zhao Yanbai [zhaoyanbai@126.com]
 * 			Sat Aug 27 14:17:13 2011
 * 
 * Description:	??????????????virtual???????
 * 
 *--------------------------------------------------------------------------
 */

#include <iostream>
using namespace std;

class Base {
public:
	Base() {cout<<"Base Constructor"<<endl;}
	~Base() {cout<<"Base Deconstructor"<<endl;}
};

class Derived : public Base {
public:
	Derived() {cout<<"Derived Constructor"<<endl;}
	~Derived() {cout<<"Derived Deconstructor"<<endl;}
};

class VBase {
public:
	VBase() {cout<<"VBase Constructor"<<endl;}
	virtual ~VBase() {cout<<"VBase Deconstructor"<<endl;}
};

class VDerived : public VBase {
public:
	VDerived() {cout<<"VDerived Constructor"<<endl;}
	~VDerived() {cout<<"VDerived Deconstructor"<<endl;}
};

int main() {
	// ???????????????????????
	// ??????????????
	cout<<"======================================="<<endl;
	Base *a = new Derived;
	delete a;

	// ????????????????????????
	cout<<"======================================="<<endl;
	Derived *b = new Derived;
	delete b;

	// ???????????????????????
	// ????,???????????????
	cout<<"======================================="<<endl;
	VDerived *c = new VDerived;
	delete c;


	return 0;
}