Ahoy,
In what little development I’ve done in golang, I appreciated the “defer”
statement as a means to write cleaner code. Basically, defer schedules a
statement for execution when the stack unwinds.
https://tour.golang.org/flowcontrol/12
We have several specialized helper classes in Qt for
std::async(std::launch::deferred, ...);
?
Best regards,
Jesús
Original message
From: Tor Arne Vestbø
Date: 07/03/2019 18:11 (GMT+01:00)
To: Volker Hilsheimer
Cc: Qt development mailing list
Subject: Re: [Development] Go's "defer" statement for C++/Qt
Hi Volker,
I have no idea about Go, but deferred signal emission is somewhat
useful in async programming (at least in my practice). In that case,
there is a need to 'defer' execution to continue after the control is
returned (usually in EventLoop via QMetaObject::invokeMethod(...,
https://doc.qt.io/qt-5/qscopeguard.html
Tor Arne
> On 7 Mar 2019, at 18:01, Volker Hilsheimer wrote:
>
> Ahoy,
>
> In what little development I’ve done in golang, I appreciated the “defer”
> statement as a means to write cleaner code. Basically, defer schedules a
> statement for
Hey Alexander,
deferred signal emission (or rather, deferred slot invocation) is a different
topic. Wouldn't work well in my example, for the lack of an event loop. And
object lifetime management would either way be a mess.
Suggest you check the link to the explanation of go that I included
Le jeu. 7 mars 2019 à 18:09, Tor Arne Vestbø a écrit :
>
> https://doc.qt.io/qt-5/qscopeguard.html
>
Nice !
And apparently there is also
https://doc.qt.io/qt-5/qscopedvaluerollback.html, which seems to be a
public and templatized version of QBoolBlocker.
> Tor Arne
>
> > On 7 Mar 2019, at
oh... it's already in qt. I've been doing it with my own class all this
time.
On Thu, Mar 7, 2019 at 8:10 PM Tor Arne Vestbø
wrote:
> https://doc.qt.io/qt-5/qscopeguard.html
>
> Tor Arne
>
> > On 7 Mar 2019, at 18:01, Volker Hilsheimer
> wrote:
> >
> > Ahoy,
> >
> > In what little
The verbiage in the example is wrong:
code_that_might_through_exceptions();
should be:
code_that_might_throw_exceptions();
Took me a moment to figure out just what it meant.
> Sent: Thursday, March 07, 2019 at 12:09 PM
> From: "Tor Arne Vestbø"
> To: "Volker Hilsheimer"
> Cc: "Qt
Tor Arne +2! :D
From: Development [development-boun...@qt-project.org] on behalf of Jason H
[jh...@gmx.com]
Sent: Thursday, March 7, 2019 11:59 PM
To: Tor Arne Vestbø
Cc: Qt development mailing list
Subject: Re: [Development] Go's "defer" statement for
I took the liberty of fixing this as I found something else in the doc that was
wrong too so figured it was quicker to go and do it instead of mentioning it (
https://codereview.qt-project.org/255289
to avoid any duplicates of people doing it already.
Andy
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