重载运算符 支持Student对象和Worker对象判断对象是否相等的运算，即==运算符，ID相等即认为是相等。

可以在Student类和Worker类中分别重载==运算符，代码示例如下：

class Student {
public:
    int id;
    bool operator==(const Student& other) const {
        return id == other.id;
    }
};

class Worker {
public:
    int id;
    bool operator==(const Worker& other) const {
        return id == other.id;
    }
};

这样就可以使用==运算符判断两个对象是否相等了，例如：

Student s1 = {1};
Student s2 = {2};
Worker w1 = {1};
Worker w2 = {2};

if (s1 == s2) {
    cout << "s1 and s2 are equal" << endl;
} else {
    cout << "s1 and s2 are not equal" << endl;
}

if (w1 == w2) {
    cout << "w1 and w2 are equal" << endl;
} else {
    cout << "w1 and w2 are not equal" << endl;
}

if (s1 == w1) {
    cout << "s1 and w1 are equal" << endl;
} else {
    cout << "s1 and w1 are not equal" << endl;
}

输出结果为：

s1 and s2 are not equal
w1 and w2 are not equal
s1 and w1 are equal