[vtkusers] Delete problems

[Dominik Szczerba]

OK, but I still need New() don't I?

Sounds like a dream. Any drawbacks?

Thanks!
Dominik

Mathieu Malaterre wrote:
> Dominik,
> 
>     Another approach (if you are using VTK 5) is the use of 
> vtkSmartPointer. You don't need to call Delete, it is done for you.
> 
> HTH
> Mathieu
> 
> David Cole wrote:
>> Any "New" calls should have corresponding "Delete" calls. Any 
>> "Register" calls should have corresponding "UnRegister" calls. And any 
>> reference loops need to be broken by setting one of the pointer 
>> variables involved to NULL or 0.
>>
>> Order is largely irrelevant except in the reference loop case. 
>> Sometimes it's important to know which part of a reference loop needs 
>> to go away first. Perhaps you need to force a bunch of objects to go 
>> away before a window is destroyed (for example).
>>
>> That's the beauty of reference counted systems: order doesn't matter 
>> as much as balance does...
>>
>> If you can't figure out where there's a missing Delete or UnRegister 
>> call, look for loops in pointer members (does your pipeline have a 
>> feedback loop??) It sometimes helps to draw a diagram of the pipeline. 
>> Or you could try simplifying it bit by bit and see when the leak goes 
>> away... Then start adding things back in until the leak comes back. 
>> That should point out where to look in the code...
>>
>>
>> Hope this helps,
>> David
>>
>>
>> Dominik Szczerba wrote:
>>
>>> Hi,
>>>
>>> I have a quite complex pipeline with a few actors and filters. When I 
>>> clean up at the end I always get a non-zero reference count somewhere 
>>> (using C++). How do I robustly know in which order I should Delete my 
>>> components?
>>>
>>> PS. this is particularly annoying in combination matlab-vtk, as 
>>> matlab dies on any of such errors.
>>>
>>> regards,
>>> Dominik
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-- 
Dominik Szczerba, Ph.D.
Computer Vision Lab CH-8092 Zurich
http://www.vision.ee.ethz.ch/~domi