That did it.
Thanks,
-K
On Wed, 25 Apr 2007, Thrall, Bryan wrote:
Keith Parkins wrote on Wednesday, April 25, 2007 1:45 PM:
I am a bit fuzzy on reference pointers and am not certain why the
following is bad although I have a gut feeling as to why.
I have a class Derived which is derived from base class MY_D_REF
which is a descendant of osg::Referenced. Derived is also a direct
decedent of osgGA::GUIEventHandler.
class Derived : public MY_D_REF, public osgGA::GUIEventHandler,
class MY_D_REF : public osg::Referenced
osgGA::GUIEventHandler also is derived from osg::Referenced, so you're
actually inheriting from that class multiple times. Try using virtual
inheritance.
Class MY_D_REF has a callback which uses a this * to pack its callback
data:
trans->setUserData(this);
trans->setUpdateCallback(new MyCallback);
//---------------------------------------------------------------
class MyCallback : public osg::NodeCallback {
public:
virtual void operator()(osg::Node *node, osg::NodeVisitor *nv) {
osg::ref_ptr<MY_D_REF> wp = dynamic_cast<MY_D_REF*>
(node->getUserData());
/--- do stuff --/
traverse(node, nv);
}
When Derived is destroyed at the end of the program, I get an access
violation (xmemory's (windoze) destructor template).
IF Derived is not derived from both classes, everything is okay.
or
IF I take out the callback, everything is okay.
When I say that everything is okay, I mean the program exits fine. I
understand that everything is not in fact okay.
Is this because of packing my callback with a this pointer and it's
not getting its count decreased? Is that bad mojo? Is there something
special I should be doing to decrease the reference the MY_D_REF
object in its destructor? I have the destructors protected for the
derived classes. Or is this a something that I might run into because
multiple ancestors are derived from osg::Referenced? I was worried
about a possible circular reference, so I took out reference pointers
in the derived classes, but the results were the same.
Thanks,
Keith
HTH,
--
Keith Parkins U of R Center for Visual Science
[EMAIL PROTECTED] Meliora Hall, Room 236
office: (585) 275-3938 lab: (585) 275-2230
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