[Interest] QSharedDataPointer detach too much ( don't call const )

[Michal Lazo]

I still don't see reason why compiler don't call const variants to access
raw pointer
http://code.qt.io/cgit/qt/qtbase.git/tree/src/corelib/tools/qshareddata.h#n76

for example here(QTextCursor)
http://code.qt.io/cgit/qt/qtbase.git/tree/src/gui/text/qtextcursor.cpp#n1151
I would expect calling const variant and I think that author of that lines
expect same.

On Thu, Sep 20, 2018 at 10:55 AM Philippe <philwave at gmail.com> wrote:

> You just have to change your line:
>
> Car * carPtr = &car;
> with
>
> *const* Car * carPtr = &car;
> Philippe
>
> On Thu, 20 Sep 2018 10:40:01 +0200
> Michal Lazo <xlazom00 at gmail.com> wrote:
>
>
>
> Hello
> example
> https://pastebin.com/xL9yWhKe
>
> I never used QSharedDataPointer in my code but is is heavily used in Qt
> My problem is that I found that QSharedDataPointer prefer non const
> operator for access raw pointer to object instead of const variant.
> And at the end non const variant call detach() = cloning object
> Look at my example and plz debug if conditions
>
> I use compiler MSVC 2015, 2017
>
> My problem is that for example QTextCursor use this constructions and it
> heavily call detach. And simple call const variant of method should fix
> this.
>
> Anybody can explain this behaviour?
>
>
>
> _______________________________________________
> Interest mailing list
> Interest at qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/interest/attachments/20180920/75e8c6b2/attachment.html>