使用“替代"或“最终"说明符时，“虚拟"关键字是否不是多余的? [英] Isn't 'virtual' keyword redundant when 'override' or 'final' specifiers are used?

问题描述

假设我有以下基类:

class Base {
    public:
        virtual void f() {};
};

如果我想编写一个将覆盖f()并且不允许将其覆盖到其派生类的类，则可以使用以下方法来编写它:

If I want to write a class that will override the f() and will not allow to override it to it's derived classes can write it using following approaches:

方法1:

class Derived : public Base {
    public:
        virtual void f() override final {};
};

方法2:

class Derived : public Base {
    public:
        void f() final {};
};

当Approach 2更紧凑并且final仍然说f()实际上是虚拟的并且覆盖基类方法时，

Approach 1将会详细介绍.

Approach 1 is a fully detailed when Approach 2 more compact and final still says that f() is actually virtual and overrides the base class method.

哪种方法更合适?

推荐答案

class Derived : public Base {
public:
    void f() override final {};
};

也许是那样吗?派生类中不需要virtual关键字，如果没有重写方法，则override和final都会给您一个编译器错误，但是您或其他人可能希望将来删除final关键字，然后再删除给您方法行为的纯意图.

Maybe that way? virtual keyword is not needed in derived class, override and final both give you a compiler error if there is no method to override, but you or someone else may want to remove final keyword in future then override give you a pure intention of your method behavior.

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