运算符>>重载

#include <iostream>
using namespace std;

class Base {
public:
    int value;
    Base(int val) : value(val) {}
};

class Derived : public Base {
public:
    Derived(int val) : Base(val) {}
};

int operator>>(Base& obj) {
    cout << "Base: " << obj.value << endl;
    return 0;
}

int operator>>(Derived& obj) {
    cout << "Derived: " << obj.value << endl;
    return 0;
}

int main() {
    Base b1(10);
    Derived d1(20);

    operator>>(b1);
    operator>>(d1);

    return 0;
}