How to delete a QObject derived class from within one of its own methods
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jimgilmour1
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Since this is a public slot, it can be connected to a signal or it can be just called in any method of the class. | Since this is a public slot, it can be connected to a signal or it can be just called in any method of the class. | ||
| − | There are no | + | There are no problem if a signal or a method calls more than one time [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater QObject::deleteLater()] |
| − | Beginner developers | + | Beginner developers sometimes use |
<code cpp> | <code cpp> | ||
delete this; | delete this; | ||
</code> | </code> | ||
and this is dangerous since the Qt event loop could invoke a method of the deleted class. Hence, the application or library will crash. | and this is dangerous since the Qt event loop could invoke a method of the deleted class. Hence, the application or library will crash. | ||
| + | =Related Qt Documentation link = | ||
| + | Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()] | ||
[[Category:Qt]] | [[Category:Qt]] | ||
Revision as of 19:00, 20 June 2010
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Keywords: Qt, deleteLater
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Last edited: jimgilmour1
(20 Jun 2010)
In order to delete a QObject-derived class from one of its own methods, developers have to use
deleteLater();
Since this is a public slot, it can be connected to a signal or it can be just called in any method of the class.
There are no problem if a signal or a method calls more than one time QObject::deleteLater()
Beginner developers sometimes use
delete this;
and this is dangerous since the Qt event loop could invoke a method of the deleted class. Hence, the application or library will crash.
Related Qt Documentation link
Qt 4.6 deleteLater()
