[Paraview] vtkCompositeDataIterator and GoToFirstItem()

[Utkarsh Ayachit]

You might want to attach a debugger and produce a stack trace to see
where you are getting a segfault.



On Wed, Mar 31, 2010 at 12:12 PM, Adriano Gagliardi
<agagliardi at ara.co.uk> wrote:
>
> I'm using the vtkCompositeDataIterator to iterate over a multiblock data-set
> multiple times. I'd like to reuse the iterator I create in the first
> instance by using GoToFirstItem after it has finished the traversal, but I'm
> getting a segmentation fault. Is this possible or am I doing this wrong?
> Example code below:
>
>      for ( vtkIdType i = 0; i != max; ++i ) {
>          vtkCompositeDataIterator* iter = test->NewIterator();
>        iter->GoToFirstItem();
>        for ( int j = 0; j != test->GetNumberOfBlocks(); ++j ) {
>          //do something here
>        }
>        iter->GoToNextItem();
>      }
>      iter->Delete();
>
> It works when the for loops are switched around. I'm just interested to see
> what the performance difference is between them:
>
>        vtkCompositeDataIterator* iter = test->NewIterator();
>      iter->GoToFirstItem();
>        for ( int j = 0; j != test->GetNumberOfBlocks(); ++j ) {
>        for ( vtkIdType i = 0; i != max; ++i ) {
>          //do something here
>        }
>        iter->GoToNextItem();
>      }
>      iter->Delete();
>
> Cheers,
>
> Adriano
>
> ===================================
>
> Adriano Gagliardi MEng PhD
> Business Sector Leader
> Computational Aerodynamics
> Aircraft Research Association Ltd.
> Manton Lane
> Bedford
>
> Tel: 01234 32 4644
> E-mail: agagliardi at ara.co.uk
> Url: www.ara.co.uk
>
>
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