[Insight-developers] ImageRandomNonRepeatingConstIteratorWithIndex segfault

[David Doria]

If I create this iterator with:
itk::ImageRandomNonRepeatingConstIteratorWithIndex<ImageType>
imageIterator(image, image->GetLargestPossibleRegion());

everything works fine. However, if I do this:

itk::ImageRandomNonRepeatingConstIteratorWithIndex<ImageType> imageIterator;
imageIterator =
itk::ImageRandomNonRepeatingConstIteratorWithIndex<ImageType>(image,
image->GetLargestPossibleRegion());

it segfaults on the GoToBegin() call.

The crash is at this line of UpdatePosition():

PositionValueType position = ( *( this->m_Permutation )
)[m_NumberOfSamplesDone % m_NumberOfSamplesRequested];

m_Permutation is valid (it was set when the (image, region) constructor was
called), but m_Permutation->m_Permutation is NULL. It is valid when I create
the iterator with the first version (above). The default constructor just
sets everything to NULL, so I don't see any reason why calling the (image,
region) constructor after the default constructor wouldn't work.

Any thoughts?

David
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