[Qt-creator] Proposals for Updating the Qt Creator Coding Style

Daniel Teske daniel.teske at digia.com
Thu Oct 2 11:30:30 CEST 2014

On Thursday 02 Oct 2014 10:01:30 Christian Kandeler wrote:
> On 10/01/2014 04:21 PM, Daniel Teske wrote:
> > ** Qt5 connects vs Qt4 connects
> > 
> > - Prefer to use qt5 style connects with member function pointers to the
> > qt4
> > style of using SIGNAL and SLOT macros.
> > 
> > - Avoid overloading signals or slots
> > - Avoid calling connect via "object->connect()"
> Can you elaborate on the latter point? I forgot the reason.
The reason is that it's different between the qt4 connect and the qt5 connect.

With qt4 connects,
a->connect(b, SIGNAL(sig(), SLOT(slot()))
is equivalent to
connect(b, SIGNAL(sig()), a, SLOT(slot()));

because there is a member method connect for that. Thus the connection is 
removed if "a" is deleted

a->connect(b, &B::sig, &A::slot),

calls the *static* connect method, that takes no context object, so the 
connection is not removed if "a" is deleted.

For that reason I'd like to discourage using the member functions at all.


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