Simple username and password verification

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/*
 * usrpass.cpp
 * usrpass.cpp is licensed under GNU GENERAL PUBLIC LICENSE
 *  Created on: Nov 10, 2012
 *      Author: sin
 */
#include <iostream>
#include <string>
#include <vector>
using namespace std;

class Pair{
	string username, password;
public:
	Pair(string usr, string pas){
		username=usr;
		password=pas;
	}

	string getUsr(){return username;}
	string getPas(){return password;}

	bool const operator==(Pair& rhs){
		return (this->username==rhs.getUsr() && this->password==rhs.getPas());
	}

	bool const operator<(Pair &rhs){
		return (this->username<rhs.getUsr() && this->password<rhs.getPas());
	}

	bool const operator>(Pair &rhs){
		return (this->username>rhs.getUsr() && this->password>rhs.getPas());
	}

	bool const operator!=(Pair &rhs){
		return (this->username!=rhs.getUsr() && this->password!=rhs.getPas());
	}
};

bool check(vector<Pair> list, Pair elem){
	vector<Pair>::iterator it=list.begin();
	while (it!=list.end() && *it!=elem) ++it;
	return (it!=list.end());
}

int main(){
	vector<Pair> db;
	db.push_back(Pair("admin", "1234"));
	db.push_back(Pair("omg", "5678"));
	string u, p;
	cout<<"username: ";
	cin>>u;
	cout<<"password: ";
	cin>>p;
	if (check(db, Pair(u, p)))
		cout<<"access granted.\n";
	else
		cout<<"invalid username/password.\n";
	return 0;
}