类与对象解剖(虚函数)

#include <iostream>
using namespace std;

class ClassA
{
public:
	int m_data1;
	int m_data2;
	
	void func1(){}
	void func2(){}

	virtual void vfunc1(){}
	virtual void vfunc2(){}
};


class ClassB : public ClassA
{
public:
	int m_data3;

	void func2(){}

	virtual void vfunc1(){}
};

class ClassC : public ClassB
{
public:
	int m_data1;
	int m_data4;

	void func2(){}

	virtual void vfunc1(){}
};


void main()
{
	cout<<sizeof(ClassA)<<endl;
	cout<<sizeof(ClassB)<<endl;
	cout<<sizeof(ClassC)<<endl<<endl;

	ClassA a;
	ClassB b;
	ClassC c;

	b.m_data1 = 1;
	b.m_data2 = 2;
	b.m_data3 = 3;

	c.m_data1 = 11;
	c.m_data2 = 22;
	c.m_data3 = 33;
	c.m_data4 = 44;
	c.ClassA::m_data1 = 111;

	cout<<b.m_data1<<endl;
	cout<<b.m_data2<<endl;
	cout<<b.m_data3<<endl<<endl;

	cout<<c.m_data1<<endl;
	cout<<c.m_data2<<endl;
	cout<<c.m_data3<<endl;
	cout<<c.m_data4<<endl;
	cout<<c.ClassA::m_data1<<endl<<endl;

	cout<<&b<<endl;
	cout<<&b.m_data1<<endl;
	cout<<&b.m_data2<<endl;
	cout<<&b.m_data3<<endl<<endl;

	cout<<&c<<endl;
	cout<<&c.ClassA::m_data1<<endl;
	cout<<&c.m_data1<<endl;
	cout<<&c.m_data2<<endl;
	cout<<&c.m_data3<<endl;
	cout<<&c.m_data4<<endl<<endl;
}