C++类中变量也可以是引用哈------要用初始化列表来初始化

#include <iostream>
using namespace std;

class A
{
public:
int &x;
int &y;

A(int &tmpX, int &tmpY):x(tmpX), y(tmpY){}

};

int main()
{
int tmpX = 1;
int tmpY = 2;

A a(tmpX, tmpY);
a.x = 5;
a.y = 6;

cout << a.x << endl;  // 5
cout << a.y << endl;  // 6

return 0;
}