小编Gho*_*ade的帖子

如果我定义这样的类:

class A{
public:
    A(){}
    virtual ~A(){}
    virtual void func(){}
};

这是否意味着虚拟析构函数并且func内联

我对以下情况有点困惑,它们是否是正确的覆盖功能copy但没有超载的方法,或者它们都是正确的？

class Base{
public:
    virtual Base* copy(Base* b){...}
};

class Derived:public Base{
public:
    virtual Base* copy(Base* b){...}//I know this should work
 // but how about the followings?
    //virtual Base* copy(Derived* b){...}
    //virtual Derived* copy(Base* b){...}
    //virtual Derived* copy(Derived* b){...}
};

顺便说一下,访问权限的变化是否会有所不同？比如,我像这样编写Derived类:

class Derived:public Base{
private://or protected:
    virtual Base* copy(Base* b){...}
    ...
};