同名函数

代码示例:

class Student {
public:
    void eat() {
        cout << "Student::eat()" << endl;
    }
};

class Worker {
public:
    void eat() {
        cout << "Worker::eat()" << endl;
    }
};

class Undergraduate : public Student, public Worker {
public:
    void eat() {
        cout << "Undergraduate::eat()" << endl;
    }
};

如何调用父类的同名函数

int main() {
    Undergraduate ug;
    ug.eat(); // Undergraduate::eat()
    ug.Worker::eat(); // Worker::eat()
    ug.Student::eat(); // Student::eat()
    ug.Undergraduate::eat();// Undergraduate::eat()

    getchar();
    return 0;
}

同名变量

class Student {
public:
	int m_age;
};

class Worker {
public:
	int m_age;
};

class Undergraduate : public Student, public Worker {
public:
	int m_age;
};

int main() {
	Undergraduate ug;
	ug.m_age = 10;
	ug.Student::m_age = 20;
	ug.Worker::m_age = 30;
	ug.Undergraduate::m_age = 40;

    cout << ug.Undergraduate::m_age << endl; // 40
    cout << ug.Student::m_age << endl; // 20
    cout << ug.Worker::m_age << endl; // 30
	
    cout << sizeof(Undergraduate) << endl; // 12

	getchar();
	return 0;
}

同名函数和同名变量都是针对父类与子类