Multi Inheritence in QT

Beginner

Thursday, January 31st 2008, 7:56am

I tried to inherit from two classes one was derived from QObject and the other from QWidget - thus creating the "dreaded diamond".
Qt Throwed a warning:
trace.h:85: Warning: Class MyTracer inherits from two QObject subclasses QWidget and TracerInterface. This is not supported!

virtual inheritence didnt work so I changed my architucture and now everything is A'Ok.
My question is what is the risk in inheriting from two QObjects?

This post has been edited 1 times, last edit by "ManicQin" (Jan 31st 2008, 10:43am)

mikolajS

Beginner

Posts: 4

Location: Gdansk

2

Friday, February 8th 2008, 10:45am

Do you want have a textbox witch being a button at the same time? I think it may be possible create such library but it'd be very difficult.

ManicQin

Beginner

Posts: 17

3

Friday, February 8th 2008, 11:24am

Something like that at the end I just used composition...

nijish

Trainee

Posts: 154

Location: Bangalore

Occupation: Software Engineer

4

Sunday, February 17th 2008, 10:14pm

Quoted

Originally posted by mikolajS
Do you want have a textbox witch being a button at the same time? I think it may be possible create such library but it'd be very difficult.

will try and let know.

composition would not yield the same result. maybe it was to have a qwidget 'within' a qobject right?

KingMike

Beginner

Posts: 55

5

Thursday, May 1st 2008, 4:22pm

RE: Multi Inheritence in QT

The references would be ambiguous and you would need to call items like

Object1::setTimer
Object2::setTimer

nijish

Trainee

Posts: 154

Location: Bangalore

Occupation: Software Engineer

6

Wednesday, May 14th 2008, 12:35pm

RE: Multi Inheritence in QT

Quoted

Originally posted by KingMike
The references would be ambiguous and you would need to call items like

Object1::setTimer
Object2::setTimer

EXPLAIN

mikolajS

Beginner

Posts: 4

Location: Gdansk

7

Saturday, May 17th 2008, 7:04pm

KingMike, in theory of course, but do you ever tried compile class inherit from two classes QT? It returns error.
What about signals? How library can know which base class made signal?

This post has been edited 1 times, last edit by "mikolajS" (May 17th 2008, 7:06pm)

QtForum.org