C++final关键字作用

1、类被标记为final，禁止被继承

class base final
{}；

class derived: public base    // 报错，不能将"final"类型作为基类
{};

 

2、虚函数（函数必须是虚函数）被标记final，禁止被 override

class base
{
    virtual void show() final { cout << "this is base" << endl; }
};

class derived : public base
{
    void show() { cout << "this is derived" << endl; }
        //  error：declaration of 'show' overrides a 'final' function（把override翻译成“重写”总感觉很矛盾）
};