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A detailed discussion of c++11 final and override specifiers

高洛峰
Release： 2017-01-23 14:04:54
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As shown below: 

//final,override出现在形参列表以及尾置返回类型之后
#include <iostream>
using namespace std;
struct B{
    virtual void f1(int) const;
    virtual void f2(int);
    void f3(int) final;//出错，final不能修饰非虚函数
};
struct D:B{
    void f1(int) const override ;//去掉const将出错，必须和基类中的函数原型一致，否则不能用override来表示覆盖
    void f2(int) final;//final说明继承D的派生类中不能覆盖该函数
    void f3();
};
struct E:B{
    void f2(int);//ok，其直接基类B中该函数没有final说明符
};
struct F:D{
    void f2(int);//出错，无法覆盖该函数，原因是其直接基类D中有final说明符
};
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final means that the virtual function cannot be overridden, and override means that the function overrides a certain virtual function

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