看看下面的代码

这是错误的

class A {
public:int x = 10;
};
class B :public A {using A::x;int x = 100;
};

看看函数

class A {
public:void fun(){cout << "uuuu" << endl;}
};
class B :public A {
public:using A::fun;void fun(){cout << "lalala" << endl;}
};int main()
{B b;b.fun();   // 输出 lalalab.A::fun();  // 输出 uuuu
}