Code seems correct but doesn't work

[JohnSmith70]

I call this method and pass the list as an argument, but the list doesn't change. Why doesn't it work? I have declared the classes Person and Trainer which work fine. There is something wrong here:

void read_people(list<Person *> obj1) {
    char input;
    while (cin >> input)
        if (input== ’t’) {
        Trainee t;
        cin >> t;
        obj1.push_back(&t);
    } 
   else if (input == ’ts’) {
       Trainer ts;
       cin >> ts;
       obj1.push_back(&ts);
   }
}

Thanx,

John