[Interest] QtThread

[George Tasopoulos]

Would it even be possible to check for such a thing? moveToThread accepts a
pointer to a QObject, and this pointer is passed by value. How could the
function know whether this value was given to it as "QObject* pObject" or
"QObject* this"?
Does Qt have a way to check code before it's given to the compiler?

---
Yours sincerely,
George Tasopoulos
On 21 Jan 2014 09:44, "Bo Thorsen" <bthorsen at ics.com> wrote:

> Den 20-01-2014 17:32, Thiago Macieira skrev:
> > On segunda-feira, 20 de janeiro de 2014 12:41:33, Bo Thorsen wrote:
> >> I have just created a suggestion in the bug tracker to make it illegal
> >> to do moveToThread(this):
> >>
> >> https://bugreports.qt-project.org/browse/QTBUG-36278
> >>
> >> It can't be said often enough: Don't do this! But if it was illegal
> >> behaviour, we wouldn't have to say it.
> >
> > Because it's not illegal to do it. It's just a bad idea in most cases.
>
> This is true, and I do see the point. If someone can actually point to a
> reasonable use case for it. If not, I would still choose to make it
> illegal.
>
> I have seen moveToThread(this) many times and every single one of them
> was wrong. To me this suggests that it might be better to protect new Qt
> developers instead of handing them a tool they only use to shoot
> themselves in the foot with.
>
> > I'd rather not add a check for things you shouldn't do but that might
> still
> > work nonetheless. That's wasted CPU cycles for people who did the right
> thing.
>
> This point I won't just take, though. moveToThread is not an operation
> that will be used often, so optimization is almost irrelevant. Well, I
> certainly hope that noone does moveToThread a lot :)
>
> Anyway, it's not my decision. I'll argue the case because I think it's
> the right thing to do, but it's not important to me.
>
> Bo.
>
> --
> Bo Thorsen, European Engineering Manager, ICS
> Integrated Computer Solutions. Delivering World-Class Applications
> http://ics.com/services
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