[vtk-developers] vtkImageToStructuredPoints missing GetOutput function

[Francois Bertel]

Hello,

GetOutput() in vtkImageAlgorithm is not virtual so you are not
overriding. If you make GetOutput virtual in vtkImageAlgorithm then it
will be a case of overriding with covariant return type (C++98).
I'm not sure how the VTK wrappers handle that. I remember some red
dashboard with java in the past because either the VTK wrapper was not
allowing covariant return type or the JDK at this time was not
supporting it.

Anyway, some other classes just add a new method instead, like
"GetStructuredPointsOutput()".

Just my 2 cents. Any other suggestions are welcome.


On Wed, Feb 3, 2010 at 5:45 PM, David Doria <daviddoria+vtk at gmail.com> wrote:
> The GetOutput function is not overriden in vtkImageToStructuredPoints, so if
> you try to do this:
> vtkStructuredPoints* structuredPoints = i2sp->GetOutput();
> it complains that it can't convert from vtkImageData* to
> vtkStructuredPoints*
> This is fixed by adding:
> vtkStructuredPoints* GetOutput();
> to vtkImageToStructuredPoints.h
> and
> vtkStructuredPoints* vtkImageToStructuredPoints::GetOutput()
> {
>   return vtkStructuredPoints::SafeDownCast(this->GetOutputDataObject(0));
> }
> to vtkImageToStructuredPoints.cxx
> Any objections?
> Thanks,
>
> David
>
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