[Interest] Problem about signals/slots in Qt 5

Thiago Macieira thiago.macieira at intel.com
Tue Sep 18 15:07:58 CEST 2012

On terça-feira, 18 de setembro de 2012 13.47.57, Sean Harmer wrote:
> > I like this new syntax much better since it finds signal/slot mismatches
> > at compile time. I used to miss the connection mismatch messages in the
> > sea of my REALLY chatty logs. And pulling my hairs wondering why
> > something doesn't work. :)
> Run your application with the environment variable QT_FATAL_WARNINGS
> defined. Then the application will break when a connect fails or anything
> else prints out a qWarning().

I was about to suggest that, but there are two drawbacks with this solution:

1) it only aborts if the connect was executed in the first place. If the 
application isn't sufficiently tested, the bug might linger for a long time, 
even to a release, because that code path has never got executed.

2) it assumes that people aren't using qWarnings for non-problems. KDE 
applications used to do that a lot, until I changed kWarning to be Debug 
level, instead of Warning level.

Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
     Intel Sweden AB - Registration Number: 556189-6027
     Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
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