我正在尝试在我创建的 UserLogin 类上重载输入运算符。不会引发编译时错误,但也不会设置值。
一切都运行了,但 ul 的内容仍然存在: string id is sally 登录时间为 00:00 注销时间为 00:00
入口点
#include <iostream>
#include "UserLogin.h"
using namespace std;
int main() {
UserLogin ul;
cout << ul << endl; // xxx 00:00 00:00
cin >> ul; // sally 23:56 00:02
cout << ul << endl; // Should show sally 23:56 00:02
// Instead, it shows xxx 00:00 00:00 again
cout << endl;
system("PAUSE");
}
用户登录.h
#include <iostream>
#include <string>
#include "Time.h"
using namespace std;
class UserLogin
{
// Operator Overloaders
friend ostream &operator <<(ostream &output, const UserLogin user);
friend istream &operator >>(istream &input, const UserLogin &user);
private:
// Private Data Members
Time login, logout;
string id;
public:
// Public Method Prototypes
UserLogin() : id("xxx") {};
UserLogin( string id, Time login, Time logout ) : id(id), login(login), logout(logout) {};
};
用户登录.cpp
#include "UserLogin.h"
ostream &operator <<( ostream &output, const UserLogin user )
{
output << setfill(' ');
output << setw(15) << left << user.id << user.login << " " << user.logout;
return output;
}
istream &operator >>( istream &input, const UserLogin &user )
{
input >> ( string ) user.id;
input >> ( Time ) user.login;
input >> ( Time ) user.logout;
return input;
}