Hi Ku,
I had an idea : might inheritance interfere with the osg::Referenced system? I
mean, if I create my own class derived from PAT, then put it in a ref_ptr, will
it be handled correctly?
No, it should work well as long as you follow the rules... see below.
'cause I've found out the following behaviour :
class CustomPAT : public osg::PositionAttitudeTransform {...}
int main()
{
PositionAttitudeTransform* myPAT1 = new PositionAttitudeTransform();
delete myPAT1; // Compilation error -> normal
CustomPAT* myPAT2 = new CustomPAT();
delete myPAT2; // Compilation OK !!! -> shouldn't be
}
Your CustomPAT class probably does not declare a destructor. This means
the compiler generates one for you, and it will be public, which is why
you can delete myPAT2. Create a destructor and make it protected, even
if it doesn't do anything. This is important, otherwise as you saw users
can do things that are not good...
I don't know what to think about it... Could it cause a custom class not to be
handled as it should be?...
No, that specifically should not cause ref_ptr to not delete your custom
class when it needs to. It's just that users will be able to delete it
even if it's still in the scene graph, which means probably on the next
frame your program will crash...
And another point : what if an update callback is still running when the object
is dereferenced? Will it be dereferenced too?...
You need to be careful not to invalidate iterators and not to delete an
object from within its own callback. In general you will want to gather
nodes in visitors / traversals, put them in a list and then remove them
from the scene graph separately once the traversal has ended.
Other than that, could you give us the full code of a small test program
to see why it's leaking, or even if it's really leaking? What do you use
to see if it's leaking? Some tools have trouble understanding ref_ptrs
and will report leaks where there are none...
Hope this helps,
J-S
--
______________________________________________________
Jean-Sebastien Guay [email protected]
http://www.cm-labs.com/
http://whitestar02.webhop.org/
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