[Development] The future of QProperty and QBindable

[Schimkowitsch Robert]

>
> Removing boilerplate from a C++ class that declares properties could be done
> with the help of moc, without creating bindables. I.e. a simplified
> Q_PROPERTY declaration that assumes some convention for
> getter/setter/notify-signal could be enough:
>
> class Object : public QObject
> {
>     Q_OBJECT
>     Q_PROPERTY(value)
> public:
>     // ~~~
>
>     int value() const;
>     void setValue() const;
>
> signals:
>     void valueChanged();
> };
>
> This declaration should have enough information for moc to create the
> necessary metaobject-data. it might require some non-trivial work on moc’s
> parser, I suspect, but that’s perhaps a better use of our time.
>

I have nothing against a workable replacement solution in principle (it's work to implement it, but that's life).
However, what you suggest doesn't hit the target:
1) Specifying the attributes of Q_PROPERTY is not the problem. This is straightforward, and typically just does not work at all if you forget something. Mostly.
2) Tying Q_PROPERTY to specific names for getter and signal is a bad idea anyway. This would mean more totally unnecessary changes for existing projects (except if it's just an option to use that notation, in which case I would not care to use it)
3) The real boilerplate I talk about is the change comparison. It's easy to forget (things work even if you don't do it), but at worst, the application might crash as certain values trigger an endless recursion.

Kind regards

Robert


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