Qt4 delete this vs deleteLater()

Thiago Macieira thiago at kde.org
Sun Aug 14 00:42:58 BST 2005

Dario Massarin wrote:
>So my question is: "What do you think about this?". Should we go through
>kdelibs and replace, in every QObject class, "delete this" with
> deleteLater() or there are cases in which this is not the right
> solution?

There are cases when deleteLater() may be unnecessary. So it is a 
case-by-case basis.

However, deleting an object from a slot is a BAD idea: you're deleting an 
object that is in use. I am saying that from the library developer point 
of view. Think of the following code:

	d->something = true
	emit finished();
	d->somethingElse = true;

If the slot connected to "finished" deleted the object, this code will 
either crash or cause memory corruption.

So, as a library developer, I try to avoid doing anything to the object 
after emitting any signals. But sometimes it isn't possible.

As for deleteLater(), don't think it'll magically solve all problems.

  Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
    PGP/GPG: 0x6EF45358; fingerprint:
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3. Ac seo woruld wearð geborod, swá se Scieppend cwæð "Gewurde Unix" and 
wundor fremede and him "Unix" genemned, þæt is se rihtendgesamnung.
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