2012/1/7 Thiago Macieira <thiago.macie...@intel.com>: > On Saturday, 7 de January de 2012 01.03.50, David Faure wrote: >> Shouldn't we clean that up for Qt5 and just use a bool for the contains >> method again? The Qt4 API ensures that nobody still has if (contains()==2) >> in their code anyway. > > I think it should be gone. > > For the few methods where a boolean is needed and arithmetic is wrong, the > suggestion is to use the RestrictedBool solution: > > typedef int ClassName:: *RestrictedBool;
Apologies for the off-topic: Is the RestrictedBool technique documented anywhere? What it does, how it works, why it works? I can see that it's using a member pointer to simulate a bool (presumably to avoid implicit casts to int and such), but not why this is preferable to a void* (fewer operations permitted?), and in particular why it has to be a pointer to a member of the specific class it is being used for instead of some globally-defined dummy class (even fewer operations permitted? but which ones?). Googling found nothing except the existing usage in QSharedPointer. Thanks, ~g > -- > 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 _______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
