c++ - 使用父类的重载方法

Question

我有两个类(class):父亲和儿子。儿子继承了父亲。

两者都在重载 ostream 运算符。

class Father {
public:
    friend ostream& operator<<(ostream& os, Father& v); //prints "father"
};

class Son : public Father {
public:
    friend ostream& operator<<(ostream& os, Son& v); // prints "son"
};

有没有办法，我可以从儿子那里调用父亲的“<<”？

我希望 Son 最终会打印:“父子”

Answer 1

你可以static_castSon&到Father&:

class Son : public Father {
public:
    friend std::ostream& operator<<(std::ostream& os, Son& v) {
        os << static_cast<Father&>(v);
        os << "son";   
        return os;
    }
};