lnk2019无法解析的外部命令"public:__thiscall" (一元运算符重载)

#include <iostream>



using namespace std;

// "-"的重载
//“++”的重载

//重载方式1：友元函数的重载 2：成员函数的重载

class Coordinate
{
public:
	Coordinate(int x , int y)
	{
		mx = x;
		my = y;
	};
	~Coordinate()
	{};
	Coordinate& operator-()
	{
		 mx = -mx;
		 my = -my;
		 return *this;

	}
	//friend Coordinate& operator-(Coordinate& floor);

	int mx;
	int my;
};

int main(void)
{
	Coordinate coor(2, 5);
	-coor;
	//coor.operator-();
	cout << coor.mx <<"\n"<< coor.my << endl;
	system("pause");
	return 0;


}

一元操作符重载

析构函数忘了添加 {}

报错 LNK2019