Class Subclass

code/2/2.7.cpp:33–48

    }
};
class Subclass final : public Base {
public:
    double floating;
    Subclass() = delete;
    
    // 继承构造
    Subclass(double f, int v, std::string s) : Base(s, v) {
        floating = f;
    }
    
    // 显式重载
    virtual void foo(int v) override {
        std::cout << v << std::endl;
        value = v;
    }
};  // 合法 final

// class Subclass2 : Subclass {
// };  // 非法, Subclass 已 final