[Interest] Chasing a standard

[Giuseppe D'Angelo]

Hi,

Il 05/11/18 12:08, Jean-Michaël Celerier ha scritto:
> It's not only about breaking APIs but also breaking current observable 
> behaviour - i.e. performance. Currently if you're passing data across 
> threads - e.g. compute something in a thread and pass the result to the 
> main thread to display it - you generally pass a QVector / QList / 
> QWhatever that does implicit sharing, because the signal-slot mechanism 
> will do a copy of the object in any case across threads and doing two 
> atomic operations for a QVector copy is cheaper than creating a new 
> std::vector, calling malloc, and copying 500 ints however you look at it.
> What is the option if Qt opts out from this ? put everything in 
> shared_ptr ?

Hold on -- I don't think that anyone wants to make Qt containers NOT 
implictly shared. In other words, Qt 6 containers will be implictly 
shared just as today. It would be a gigantic break if we suddenly made 
them not shared.

My 2 c,
-- 
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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