C++类中变量也可以是引用的代码实例

#include 
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;
}