QWeakPointer: use an alternative work-round for internalData() users

The previous work-around fails, probably because of
cross-dependencies. E.g. we have this in QtScXml:

In file included from /home/qt/work/install/include/QtCore/qsharedpointer.h:48:0,
                  from ../../src/scxml/qscxmltabledata_p.h:55,
                  from ../../src/scxml/qscxmltabledata.cpp:40:
 /home/qt/work/install/include/QtCore/qsharedpointer_impl.h:687:12: error: ‘QPointer’ does not name a type; did you mean ‘pointer’?
      friend QPointer<X>
             ^~~~~~~~
             pointer
 /home/qt/work/install/include/QtCore/qsharedpointer_impl.h:689:23: error: ‘QSmartPointerConvertFunctor’ in namespace ‘QtPrivate’ does not name a template type
      friend QtPrivate::QSmartPointerConvertFunctor<QWeakPointer>;
                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~

To fix, grand friendship only to a non-template class with a templated
static method that returns internalData(). This fixes most users,
except in qmetatype.h, which does not include qsharedpointer.h. In
order to use the non-template class in there, we need to delay its
name lookup to instantiation time. We do this by artificially making
it a dependent name, by using a class template that inherits from
our befrieded class.

Change-Id: I12b427f1fe9503df819ea5436d780972d6402e68
Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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