摘要：#include using namespace std; class A{ public: A(int x_):x(x_){}; A/*&*/ operator =(A& h)/*&*/; //加上后置&就不合法，默认情况他同时支持向左值(&)和右值(&&)赋值 friend ostream& operator << (ostream& out,cons... 阅读全文