[vtkusers] use of vtkInformationKey

[David Doria]

On Fri, Mar 5, 2010 at 7:23 AM, Rakesh Patil <rakeshthp at in.com> wrote:

> Hello,
>
> I was going through the documentation of vtk.. I came across this clas..
> vtkInformation and vtkInformationKey
>
> Can anyone explain me or guide me with an example how to use this class.
> and when and in what context is this useful..??
>
> Thanks
> Rakesh Patil
>
>
I believe these classes are only used to create "the pipeline". You'll
notice in all the RequestData functions:

int vtkDelimitedTextReader::RequestData(
  vtkInformation*,
  vtkInformationVector**,
  vtkInformationVector* outputVector)

I think they just carry around the input/output types and pointers to the
input/output objects.

Thanks,

David
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