Effective C++ 条款33 避免遮掩继承而来的名称

1. C++基类和派生类的作用域为嵌套关系,同时存在作用域屏蔽规则,例如:

class Base{
public:
    void f();
    ...
private:
    int a;
    ...
}
class Derived:public Base{
    ...
}

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