Hi Dirk,
>>Can anybody reproduce this ? Is this a problem of qt-4 or is it the
>>same with qt-3 ?
>I can't reproduce it on Linux with the attached code using Qt3. Can
>you try that? It really makes very little sense that the baseclass
>would make a difference...
Yes, it really makes little sense, but i can reproduce the problem with
the example code that you provided (using Qt-4.1.1 again). Again no
problem when i derive from QObject or another class which is not
derived from Qwidget, but fails if i use QWidget.
I stepped through the code in the debugger and found the following problem
which might be a hint for you (it's not one for me :)) ):
In method osgTypedMethodFunctor1ObjPtrCPtrRef() [file osgtypedfunctors.inl]
the OFunctor "returnValue" gets initialized by calling the method
setMethod()
(so returnValue.setMethod()):
template <class Parent, class Params> inline
void TypedStoredObjectFunctorBase<Parent, Params>::setMethod(ObjMethodF
pFunc)
{
Self::_flags |= Self::FuncPtrValid;
*((ObjMethodF *) Self::_data2) = pFunc;
}
The assignment of pFunc to _data2 "overwrites" the other member variables
like the just set _flags member variable. Before the assignment the _flags
variable has a value of 0x02 and after the assignment it has a value of
0x00.
When afterwards the TypedStoredObjectFunctor1 method is invoked, it tests
the FuncPtrValid-Flag which has been cleared by the assignment and does not
invoke the methode.
if(Self::_flags & Self::FuncPtrValid &&
Self::_flags & Self::ObjectValid)
{
//NEVER REACHES THIS ONE
return TypeTraits::callObjectMethod(Self::_data1, Self::_data2, obj);
}
else
{
//BUT THIS INSTEAD
return RetT();
}
Any idea what the problem might be ? Unfortunately i have no Linux box
available right now, so that i can double check the problem with linux
and gcc.
Thanks in advance,
Yuecel
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