STL常用运算符重载

bool operator<(const Person& p)const //小于运算符
friend ostream& operator<<(ostream& os,const Person& p1) //输出

#include
#include
#include
#include

using namespace std;

class Person
{

public:
	Person(string name, string no, int age)
	{
		this->sname = name;
		this->sno = no;
		this->sage = age;
	}

	bool operator<(const Person& p)const 
	{
		if (this->sno < p.sno)
			return true;
		return false;
	}

	friend ostream& operator<<(ostream& os,const Person& p1) 
	{
		cout << "姓名:" << p1.sname << "   学号:" 
			<< p1.sno << "   年龄：" << p1.sage << endl;

		return os;
	}
public:
	string sname;
	string sno;
	int sage;

};

int main()
{

	Person p3("王麻子", "18170025", 18);
	Person p1("张三", "18170021", 19);
	Person p2("李四", "18170022", 20);
	set<Person> st;
	st.insert(p2);
	st.insert(p1);
	st.insert(p3);
	set<Person>::iterator it;
	for (it = st.begin(); it != st.end(); it++)
		cout << *it;
	system("pause");
	return 0;
}