On Thursday 15 April 2010 04:32:08 pm you wrote:
> On 2010-04-15, Richard Dale wrote:
> > On Thursday 15 April 2010 02:26:32 pm Mark Summerfield wrote:
> > > No QString, or QVariant
> > > -----------------------
> > >
> > > The key difference between the APIs is that API 2 does not make QString
> > > or QVariant available to programmers, instead using Python 3's native
> > > str type for strings, and any Python class for QVariant.
> >
> > Sometimes you need a C++ specific type wrapped in a QVariant to make a
> >
> > method work correctly. For instance, the call might need a ushort type
> > which has no direct equivalent in Python . If you pass a Python integer
>
> it
>
> > will be converted to a QVariant with a C++ int wrapped inside it, and
> > the call expectng a ushort might not work.
> >
> > So I think you need some way of forcing the correct sort of QVariant to
> > be created, probably by having a QVariant constructor where you pass a
> > string with the C++ type, along with the Python value as another
> > argument. Or a
> >
> > tuple of the type name string, followed by the python value that could
> > be passed as an argument everywhere a QVariant was expected.
> >
> > If 'val' is an integer and we wanted a ushort based QVariant for the
> > foo() this won't work:
> > foo(val)
> >
> > So it needs to be something like this instead:
> > foo(QVariant('ushort', val))
> > foo(('ushort', val))
> >
> > -- Richard
>
> I am not aware of PyQt supporting this. So if it were added to the PSEP
> it would be above and beyond PyQt compatibility (which is fine). But can
> you provide any real use cases to justify its inclusion?
I think QtDBus support was where it was needed in QtRuby. As PyQt doesn't
support QtDBus, and PySide doesn't either currently, then they don't have that
problem. I suppose it would be anywhere QVariants are being used in an api
that involves serialization, where a C++ 'int' would be different to a
'ushort'.
-- Richard
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