C++ Point类运算符重载

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#include "stdafx.h"
using namespace std;
class Point
{
public:
	Point(double x,double y):_x(x),_y(y)
	{
	}

	~Point()
	{
	}

	Point& operator ++();
	Point operator ++(int);
	Point& operator --();
	Point operator --(int);
	friend ostream& operator <<(ostream& out,Point& a);
private:
	double _x,_y;
};
Point& Point::operator++()
{
	_x++;
	_y++;
	return *this;
}
Point Point::operator++(int)
{
	Point old=*this;
	++(*this);
	return old;
}
Point& Point:: operator --()
{
	_x--;
	_y--;
	return *this;
}
Point Point::operator --(int)
{
	Point old=*this;
	--(*this);
	return old;
}
ostream& operator<<(ostream& out,Point &a)
{
	out<<"("<<a._x<<","<<a._y<<")";
	return out;
}
int main()
{
	Point a(1,1);
	a++;
	cout<<a<<endl;
	system("Pause");
	return 0;
}