[Development] A new approach for Qt main()

[Simon Hausmann]

Apologies, I should've expanded a little more on what I said. For example if we expose a QObject class to Qt instead of a function, then we could dispatch a static meta-call to a static initialization function that is called before the constructor, if present. Introspection makes that quite easy I think.



Simon

________________________________
From: Simon Hausmann
Sent: Tuesday, December 13, 2016 11:24:48 AM
To: Laszlo Agocs; Mathias Hasselmann; development at qt-project.org
Subject: Re: [Development] A new approach for Qt main()


Hi,


I don't think it does handle those cases. But we're not talking about eliminating main(), we're talking about a second supported "launch" method.


That said, it's still possible to run code before the constructor, although it's not pretty.


Simon

________________________________
From: Laszlo Agocs
Sent: Tuesday, December 13, 2016 10:42:05 AM
To: Simon Hausmann; Mathias Hasselmann; development at qt-project.org
Subject: RE: [Development] A new approach for Qt main()

Hi,

How does this handle the cases that need code before the QGuiApplication construction? AFAICS it does not.

Laszlo

From: Development [mailto:development-bounces+laszlo.agocs=qt.io at qt-project.org] On Behalf Of Simon Hausmann
Sent: Tuesday, December 13, 2016 10:37 AM
To: Mathias Hasselmann <mathias at taschenorakel.de>; development at qt-project.org
Subject: Re: [Development] A new approach for Qt main()


Hi,



The joke of the bikeshedding aside I for one do like the idea of exporting a QObject sub-class instead of a function. That makes it easier to extend in the future with more entry-points as slots for example.







Simon

________________________________
From: Development <development-bounces+simon.hausmann=qt.io at qt-project.org<mailto:development-bounces+simon.hausmann=qt.io at qt-project.org>> on behalf of Mathias Hasselmann <mathias at taschenorakel.de<mailto:mathias at taschenorakel.de>>
Sent: Monday, December 12, 2016 7:53:50 PM
To: development at qt-project.org<mailto:development at qt-project.org>
Subject: Re: [Development] A new approach for Qt main()

Hi,

Seems this turned into a nice bike shed discussion quickly, so let me
use the chance to present my preferred Qt main(). I am totally convinced
that this one should rule the Qt world:

     class BlueBikeShedApplication : public QApplication
     {
         Q_OBJECT

     public:
         using QApplication::QApplication;

         int run()
         {
             if (!parseCommandLine())
                 return EXIT_FAILURE;
             if (!initializeColorBucket())
                 return EXIT_FAILURE;

             setupBrush();

             return exec();
         }
     };

     int main(int argc, char *argv[])
     {
         return BlueBikeShedApplication{argc, argv}.run();
     }

The big advantage I see in this approach is, that you work within a
proper QObject context with fully setup QApplication early. Also this
main() is sufficiently generic to be hidden in a platform specific
macro, or static library.

Thank you for reading,
Mathias
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