[Development] RFC: RAII for property changes

[Marc Mutz]

On Wednesday 15 April 2015 17:08:11 Matthew Woehlke wrote:
> FWIW I had the same thought; also, I'm not a fan of needing the
> Q_UNUSED, or using a macro to 'hide' it.

I haven't had to use Q_UNUSED on a RAII object since iirc GCC 3 times. What 
broken compilers are you guys using?

> What about something like this?
> 
>   QPropertyGuard g{this};
>   g.addProperty("a"); // use QObject::property
>   g.addProperty("b", m_b); // take value member by reference
>   g.addProperty(m_c, &cChanged); // ...and also slot address

There's type erasure going on, so it will allocate memory. Allocating memory 
in a setter that might just change an int is what I call inefficient.

Thanks,
Marc

-- 
Marc Mutz <marc.mutz at kdab.com> | Senior Software Engineer
KDAB (Deutschland) GmbH & Co.KG, a KDAB Group Company
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