クラス継承のthisポインタ

次の列に結合します.

//	             ，               , this  

#include "stdafx.h"
#include "cstdio"
#include "iostream"
using namespace std;

class CAnimal
{
private:
	int m_nType;
public:
	void SetType(int type)  //    void SetType(int type,(CAnimal*)this)
	{
		m_nType = type;		//    this->m_nType = type
		cout << "Type is " << m_nType << endl;
	}
};
class Cbird : public CAnimal
{
public:
	void Cry()
	{
	}
};

int main(int argc, char* argv[])
{
	Cbird bird1,bird2;
	
	bird1.SetType(1); //     Cbird::SetType(1,(Cbird*)&bird1); CAnimal::SetType(1,(Cbird*)&bird1);
	bird2.SetType(2); //     Cbird::SetType(2,(Cbird*)&bird2); CAnimal::SetType(2,(Cbird*)&bird2);	

	return 0;
}