Thread: Problem with pointers to dynamic objects

Originally Posted by CornedBee

Public and private inheritance share pretty much nothing, conceptually. Public inheritance is a subtype relationship requiring substitutability. To put it in terms of Coplien, it's a form of positive variance. Public bases are part of the interface of a class.
Private inheritance is strictly an implementation detail. It is absolutely no business of any other code that a class privately inherits something. Private inheritance is merely a convenience over containment and implementation in terms of a single subobject.

Sorry if this sounds kind of dumb, but are you saying that if I use private inheritance then the child class will not inherit any of its parents variables?

Also , I'm still having problems with these pointers . Once again the notes I got don't cover dynamic objects created within objects. I guess maybe I need a book :P

I'm trying to get the pointer to the guest staying in a room. Heres my get member function:

Code:

guests rooms::GetGuest(){return *p;}

And heres where I call it:

Code:

void CheckAvail(rooms *room)
{  
    for(int i=1; i<=num_rooms; i++)
    {
        cout << "Room: " << room[i].GetNumber() << " \tat $" << room[i].GetCost() << "\t";         
        if(room[i].GetGuest() != NULL)
            cout << "Booked\n";
        else
            cout << "Vacant\n";
    }
}

When I run the prog I get this error at the IF statement:

Code:

no match for 'operator!=' in 'rooms::GetGuest()() != 0'

Could someone please point out whats wrong here. Thx.

Cool, I chucked an ampersand in the start of the if statement and that seems to have fixed it. Thanks man

Hmm... I spoke too soon :/ The program now compiles but when it gets to the IF statement it crashes.

Heres the function again:

Code:

guests rooms::GetGuest(){return *p;}

And heres my new dodgy IF statement:

Code:

if(&room[i].GetGuest() != NULL)

Compiler message: taking address of temporary