在子类中调用父类被隐藏的函数的方法

#include <iostream>
using namespace std;
class Base
{
public:
void fm(){cout<<"base::fm()\n";}
void fm(int){cout<<"base::fm(int)\n";}
};
class D:public Base
{
public:
//using Base::fm;
void fm(){cout<<"D::fm()\n";}
};
int main()
{
D d;
d.fm();
d.fm(1);//error D中fm隐藏了Base中的两个fm
//  d.Base::fm(1);
return 0;
}