[Development] QProperty and library coding guide

Giuseppe D'Angelo giuseppe.dangelo at kdab.com
Sat Jul 18 12:17:11 CEST 2020

Il 17/07/20 19:36, Thiago Macieira ha scritto:
>> So in your example QSctpSocket would still be 24 bytes, because the
>> inheritance is not deep enough to make sizeof 32?
> Yes, with the IA-64 ABI, assuming we don't mandate [[no_unique_address]] of
> course.

Still, is it worth breaking ABI for sparing 8 bytes every 8 subclasses?

> With MSVC, it's 56 bytes.

Well, this can't be helped anyhow as MSVC doesn't support 
[[no_unique_address]], so the implementation is going to be the union, 
with the associated costs.

Giuseppe D'Angelo | giuseppe.dangelo at kdab.com | Senior Software Engineer
KDAB (France) S.A.S., a KDAB Group company
Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com
KDAB - The Qt, C++ and OpenGL Experts

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