[Development] std::optional for Q_PROPERTY

[Elias Steurer]

Hi,

I would like to voice my support for this and even extend the idea:

  * std::expected would also be nice here, because it can tell you
    /what/ went wrong. Yes, I know it is C++23...
  * Support for smart pointers, see QTBUG-60136
    <https://bugreports.qt.io/browse/QTBUG-60136>. It is already
    possible use smart pointers today, as members but they need to be
    declared as raw pointers in Q_PROPERTY, see this class for example
    <https://gitlab.com/kelteseth/ScreenPlay/-/blob/master/ScreenPlay/inc/public/ScreenPlay/app.h#L39>.
  * General futures api, see QTBUG-101025
    <https://bugreports.qt.io/browse/QTBUG-101025> so we do not block
    the main thread.

Cheers,

Eli
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