[ITK] How to sort an itk::Statistics::Subsample in reverse order?

[Jan Ehrhardt]

Hi folks,

I want to do something similar to

// Sort the subsample with heap sort:
itk::Statistics::Algorithm::HeapSort< SubsampleType >( subsample, 3, 0,
subsample->Size() );

SubsampleType::Iterator iter = subsample->End();
while(  iter != subsample->Begin() )
{
      // Do fancy stuff

      // decrease the subsample iterator
      --iter;
}

This is not possible because operator--() is not defined. Further I
havn't an option to reverse the order of sorting.

How can I solve this?

Best,
Jan