[vtkusers] Delete() usage

[David E DeMarle]

Basic story is, anyone who needs long term access to an instance,
should Register to bump the reference count. This ensures that the
instance won't be destroyed until the last user is done with it.
Likewise when you are done using an object you call Delete so that it
will eventually be destroyed,.

New, Set and Register bump the reference count. (Set decrements the
old instances count too when you replace something).
Get does not change the reference count.
Make* or Create* methods (the name is not entirely standardized) do..
Delete and UnRegister decrement the count, and when the count reaches
0, delete is called.

SmartPointers do the New for you, and call Delete when the
SmartPointer goes out of scope.

See this email for more clarification:
http://markmail.org/thread/glsnszxdkf323bhh

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Wed, Oct 10, 2012 at 10:55 AM, Jean-Hugues Royer <jhroyer at joher.com> wrote:
> Hi,
>
> Tracking memory leaks...
>
> As far as I read we are supposed to call the Delete() method each time we
> issue a New() object.
>
>
> Are we also supposed to call Delete() on objects we received from Get*()
> functions ?
>
> Example:
>
> vtkPolyData pd =
> vtkContourWidget.GetContourRepresentation().GetContourRepresentationAsPolyData()
>
> Do I have to call pd.Delete() to free it or will vtkContourWidget free it
> when deleted ?
>
>
> And regarding Set*() functions, example:
>
> vtkPlaneCollection pc = vtkPlaneCollection.New();
> vtkSmartVolumeMapper.SetClippingPlanes(pc);
>
> Do I have to call pd.Delete() to free the plane collection or will it be
> freed when the vtkSmartVolumeMapper will be deleted ?
>
>
> Thanks.
>
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