On 16-07-2020 13:08, Edward Welbourne wrote:
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.
Giuseppe D'Angelo (16 July 2020 12:58) requested:
Could anyone please illustrate with some code snippets how to achieve
this, in practice, in a number of use cases? E.g. client code (non
pimpled QObject subclass), (Qt) library code (pimpled QObject
subclass), etc.; gadgets (does QProperty work there?); with and
without other Q_PROPERTY/QProperty already present, etc.
As noted in my last mail, documentation is still lagging. Several of us
- previously ignorant of the new system - are currently helping Ulf and
Fabian with conversion. We are, in the process, helping to debug the
draft instructions for how to convert and point out gaps in the system
that make this harder than it should be. Hopefully, once we've spent a
week or two hassling Ulf and Fabian with questions, they'll have the
right things in place and know how to document it clearly. However,
doing so today would soak up some of their time that is better spent
getting the system into the right state so that the documentation
doesn't need repeated updates ...
Please be patient, we are working on this,
Please understand that waiting with this will also make other
contributors who will need to deal with QProperty wait, including those
who will need to OK such changes (such as Thiago). So, you are making
dozens of people wait to protect the time of two people? That doesn't
make much sense IMO. All that was asked for were some examples, not
fully fledged detailed documentation.
Cheers,
André
Eddy.
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