[Paraview] vtkDataObjectAlgorithm with multiple inputs

[Paul Edwards]

Hi,

I understand there is a need to call Delete on the object but I don't
understand why it is called before the line that uses the object that has
just been deleted.  I.e. why isn't it:

this->GetOutputPortInformation(0)->Set(

vtkDataObject::DATA_EXTENT_TYPE(), *newOutput->GetExtentType()*);

*newOutput->Delete();*
*
*

instead of:


*newOutput->Delete();*

this->GetOutputPortInformation(0)->Set(

vtkDataObject::DATA_EXTENT_TYPE(), *newOutput->GetExtentType()*);


Am I missing something here?

Thanks,Paul

2009/8/25 Jeff Baumes <jeff.baumes at kitware.com>

>
> On Tue, Aug 25, 2009 at 8:43 AM, Paul Edwards <paul.m.edwards at gmail.com>wrote:
>
>> Is there a reason why Delete is called before GetExtentType?  Or is this a
>> bug? (although it doesn't crash on me....)
>>
>
> SetPipelineInformation will cause the information object to increment the
> reference count of the data object. Thus calling Delete will safely
> decrement the reference count without yet releasing the memory (this matches
> the reference created by NewInstance()). This is necessary or else a
> reference will be floating and the object will never be deleted.
> Jeff
>
>
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