Issue with List of objects made of QObject

[alizadeh91]

Hi,
I have list of objects(made of QObject – myList<myObject>).
For some reasons user may be want to modify this list or maybe he/she want to cancel the modifications.
The solution which has came into my mind is to make a copy of my list and give it to user while keeping original one.
so whenever user modify copied list, i have original list so i can change it or revert it based on what user wants.
But the problem is that the objects are made of QObject, so they can not be copied(Copy constructor and
assignment have disabled in qobject)!!! I don’t know what else to do?!
If i define myObject as pointers then i can’t copy the list because they have defined as pointer
Thanks if someone can help me through this. or may be i can use another approach?

[Santosh Reddy]

First thing you have to use QList if pointer to QObject. i.e. QList<QObject *> or simply use QObjectList.


If i define myObject as pointers then i can’t copy the list because they have defined as pointer
Why you not able to copy the list? You can copy the QObjectList even though it has pointers.

[alizadeh91]

becuase if i copy it, it will copy the pointers not the values. isn't it right?

[pkj]

No, you cannot go there. The best you can do is to externalize your QObject class internals into another class. A memento design pattern like object and pass those around in the list. Since QObject cannot be copied, there is no other way.

[wysota]

becuase if i copy it, it will copy the pointers not the values. isn't it right?

Yes, it is correct. And what's wrong with that?