[PySide] [shiboken2] Shared pointer support

[Friedemann Kleint]

Hi,

 > It seems that wrapping classes which return shared pointers in a 
virtual method is not possible at all. Non-virtual functions are fine. 
The error from shiboken2 is "#error:

 > CppGenerator::writeVirtualMethodNative: B::genA(): Could not find a 
minimal constructor for type 'QSharedPointer<A >'. This will result in a 
compilation error.".

This is now in the works (see bugreports.qt.io/browse/PYSIDE-1188 ).

 > it seems to be impossible to create a shared pointer from an object 
generated from the python side.

This is still to be discussed for bugreports.qt.io/browse/PYSIDE-454 ; 
maybe some kind of make_shared() method could exposed. Right now, some 
C++ factory function is needed.

 > The documentation in shiboken regarding smart pointers seems to be 
very limited. I couldn't figure out if setting "ref-count-method" is 
required and why?

 > QSharedPointer, there ? ? doesn't seem to exist a method for querying 
the reference count.

The refcount method is optional; there will be a binding generated for 
it if it exists. QSharedPointer is for example used in

sources/pyside2/PySide2/QtQuick/typesystem_quick.xml: 
<smart-pointer-type name="QSharedPointer" type="shared" getter="data"/>

Regards, Friedemann

-- 

Friedemann Kleint
The Qt Company GmbH