C++中关于this指针的入门介绍

class Data {
public:
	void Printf()
	{
		cout << _year <<" "<<" "<< _month <<" "<< _day << endl;
	}
	void Init(int year=2022,int month=5,int day=25)
	{
		_year = year;
		_month = month;
		_day = day;
	}
private:
	int _year;
	int _month;
	int _day;
};
int main()
{
	Data d1,d2;
	d1.Init(2022,1,1);
	d1.Printf();
	d2.Init(2022,2,2);
	d2.Printf();
	return 0;
}

void Printf(const* this)//编译器实际上处理的
	{
		cout << this->_year << " " << this->_month << " " << this->_day << endl;
	}
	void Printf()//我们看到的
	{
		cout << _year <<" "<<" "<< _month <<" "<< _day << endl;
	}

void Init(const* this,int year=2022,int month=5,int day=25)//编译器处理的
	{
		this->_year = year;
		this->_month = month;
		this->_day = day;
	}
	void Init(int year = 2022, int month = 5, int day = 25)//我们看到的
	{
		_year = year;
		_month = month;
		_day = day;
	}

d1.Init(2022,1,1);//我们看到的
	d1.Init(&d1,2022, 1, 1);//编译器实际上处理的

void Printf(const* this)//错误
	{
		cout << _year <<" "<<" "<< _month <<" "<< _day << endl;
	}
void Printf()//可以运行，但是编译器默认都会加this->,所以我们可以不用加，加了也没事
	{
		cout <<this-> _year <<" "<<" "<< this->_month <<" "<< this->_day << endl;
	}