类内字符串比较出现问题

#ifndef MANAGER
#define MANAGER
#include
#include"Disk.h"
using namespace std;
class Manager
{
private:
string M_no;
string M_name;
string pass;
public:
Manager(string no1,string name1,string pass1)
{M_no=no1;
M_name=name1;
pass=pass1;
}
Manager next;
Manager getnext()const{return next;}
void alterpass();//修改密码
void altername();//修改名字
void view_disk_inf();//查看影碟信息
void view_manager_inf();//查看会员的借阅影碟信息
bool operator==(const Manager & m){return(pass==m.pass && M_no==m.M_no);}//“==”运算符提示出错!

 // Q692515.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"


#define MANAGER

#include<string>
#include<iostream>
//#include"Disk.h"
using namespace std;
class Manager
{
private:
    string M_no;
    string M_name;
    string pass;
public:
    Manager(string no1,string name1,string pass1)
    {M_no=no1;
    M_name=name1;
    pass=pass1;
    }
    Manager *next;
    Manager* getnext()const{return next;}
    void alterpass();//修改密码
    void altername();//修改名字
    void view_disk_inf();//查看影碟信息
    void view_manager_inf();//查看会员的借阅影碟信息
    bool operator==(const Manager & m){return(pass==m.pass && M_no==m.M_no);}
};

int _tmain(int argc, _TCHAR* argv[])
{
    Manager m1("1", "a", "aaa"), m2("1", "b", "aaa");
    cout << ((m1 == m2) ? "equal" : "not equal") << endl;
    return 0;
}

帮你上机测试过了。如果问题解决，请采纳下我的回答，谢谢。