[Qt-interest] No RTTI information for QTreeWidgetItem

[Scott Aron Bloom]

Gotcha...  I don't think its any different then with custom model roles.

 

In my derived class, I usually create a public enum and create a new
"add to this number and you are safe" enumeration


Scott

 

From: qt-interest-bounces at trolltech.com
[mailto:qt-interest-bounces at trolltech.com] On Behalf Of Eric Clark
Sent: Tuesday, June 02, 2009 9:39 AM
To: qt-interest at trolltech.com
Subject: Re: [Qt-interest] No RTTI information for QTreeWidgetItem

 

No. I do not mind doing this, actually it is probably faster than a
dynamic cast, but I am a little concerned that there is no way to
"reserve" the type number like there is with custom Event types. With
Events, you can register your event number, but I do not see the ability
to do this with QTreeWidgetItem's types. Is there a way that you know
of? I am just concerned about the same number being reused with someone
else's derived type.

 

Eric

 

From: qt-interest-bounces at trolltech.com
[mailto:qt-interest-bounces at trolltech.com] On Behalf Of Scott Aron Bloom
Sent: Tuesday, June 02, 2009 11:28 AM
To: qt-interest at trolltech.com
Subject: Re: [Qt-interest] No RTTI information for QTreeWidgetItem

 

Its really no different.. is it any different doing 5-10 (depending on
how many QTreeWidgetItem derived classes) if ( item->type() ) vs 5-10
castes?

Scott

 

From: qt-interest-bounces at trolltech.com
[mailto:qt-interest-bounces at trolltech.com] On Behalf Of Eric Clark
Sent: Tuesday, June 02, 2009 6:47 AM
To: qt-interest at trolltech.com
Subject: Re: [Qt-interest] No RTTI information for QTreeWidgetItem

 

I had a feeling that was the only solution. Thank you very much!

 

From: qt-interest-bounces at trolltech.com
[mailto:qt-interest-bounces at trolltech.com] On Behalf Of Scott Aron Bloom
Sent: Monday, June 01, 2009 5:27 PM
To: qt-interest at trolltech.com
Subject: Re: [Qt-interest] No RTTI information for QTreeWidgetItem

 

No it wont.. I missed that...  

 

Instead do the following, make sure you set your Type during the
construction, and call QTreeWidgetItem::type() to figure out what type
of type it is

 

Scott

 

 

 

From: qt-interest-bounces at trolltech.com
[mailto:qt-interest-bounces at trolltech.com] On Behalf Of Eric Clark
Sent: Monday, June 01, 2009 2:08 PM
To: qt-interest at trolltech.com
Subject: Re: [Qt-interest] No RTTI information for QTreeWidgetItem

 

Scott,

 

Thank you for the response, but I would not have a problem using
qobject_cast, except that QTreeWidgetItem does not inherit QObject. Will
qobject_cast work on non-QObjects?

 

Eric

 

From: Scott Aron Bloom [mailto:Scott.Bloom at sabgroup.com] 
Sent: Monday, June 01, 2009 4:04 PM
To: Eric Clark; qt-interest at trolltech.com
Subject: RE: [Qt-interest] No RTTI information for QTreeWidgetItem

 

Don't use RTTI on QT based objects... (in fact its rather unsafe when
crossing any DLL boundry on windows...) use qobject_cast

 

Scott

 

From: qt-interest-bounces at trolltech.com
[mailto:qt-interest-bounces at trolltech.com] On Behalf Of Eric Clark
Sent: Monday, June 01, 2009 1:05 PM
To: qt-interest at trolltech.com
Subject: [Qt-interest] No RTTI information for QTreeWidgetItem

 

Hello All,

 

I have a class that inherits QTreeWidgetItem. When I attempt to do a
dynamic_cast on a QTreeWidgetItem that was created using my subclass
BaseTreeWidgetItem I get an exception thrown by Microsoft C++ that says
the object is a __non_rtti_object. Has anyone seen this problem? If I
just cast the object instead of using a dynamic_cast everything works
just fine.

 

Thanks in advance!

Eric

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.qt-project.org/pipermail/qt-interest-old/attachments/20090602/5eaeb080/attachment.html