[Interest] QtThread

[Etienne Sandré-Chardonnal]

I don't see what is complicated here?

if(  (QObject*)targetThread==(QObject*)this )
{
    qWarning("That's wrong');
    return;
}

Etienne


2014/1/21 George Tasopoulos <tasopoulos.yorghos at gmail.com>

> 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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