1.流重载 istream ostream

1.class

class MM {
	friend ostream& operator<<(ostream& out, MM& mm);
	friend istream& operator>>(istream& in, MM& mm);
public:
	MM() {}
	MM(int age,string name):age(age),name(name) {}
private:
	int age;
	string name;
};

2.实现函数

ostream& operator<<(ostream& out, MM& mm) {
	out << mm.age << "岁的" << mm.name << "喜欢我" << endl;
	return out;
}
istream& operator>>(istream& in, MM& mm) {
	in >> mm.age >> mm.name;
	return in;
}

3.main

int main() {
	//输出流
	MM mm(23, "王");
	MM mm1(18, "女神");
	cout << mm <<mm1<< endl;
	//输入流
	MM mm2, mm3;
	cin >> mm2 >> mm3;
	cout << mm2 << mm3;
	return 0;
}

结果：

2. 重载的一些基础知识