[Development] QProperty and library coding guide

Thiago Macieira thiago.macieira at intel.com
Thu Jul 16 23:30:59 CEST 2020

On Thursday, 16 July 2020 13:16:41 PDT Giuseppe D'Angelo via Development 
> Il 16/07/20 12:43, Volker Hilsheimer ha scritto:
> > For pre-C++20 (where it’s possible to have zero-size structs), and for
> > compilers that don’t respect the [[no_unqiue_address]] attribute, all
> > these struct-instances are put into a union. In that case, a class using
> > QProperty will be larger (by the same amount no matter the number of
> > properties) than the same class in Qt 5. With C+++ 20 and compilers that
> > do respect [[no_unique_address]], the size and layout of these classes
> > will be the same.
> I'm not fully understanding this last part -- does changing compiler
> break ABI, because the implementation of properties change (from an
> union to [[no_unique_address]] members)?


Already sent a -2 to the commit that added this support, because it can't 
work. The commit will need to be reverted.

Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel System Software Products

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