/usr/include/ITK-4.9/itkNeighborhoodSampler.hxx is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef itkNeighborhoodSampler_hxx
#define itkNeighborhoodSampler_hxx
#include "itkNeighborhoodSampler.h"
namespace itk
{
namespace Statistics
{
template< typename TSample >
NeighborhoodSampler< TSample >
::NeighborhoodSampler()
{}
template< typename TSample >
NeighborhoodSampler< TSample >
::~NeighborhoodSampler()
{}
template< typename TSample >
void
NeighborhoodSampler< TSample >
::GenerateData()
{
  const SampleType *inputSample = this->GetInput();
  SubsampleType *outputSubSample =
    static_cast< SubsampleType * >( this->ProcessObject::GetOutput(0) );
  outputSubSample->SetSample(inputSample);
  outputSubSample->Clear();
  const InputRadiusObjectType *radiusObject = this->GetRadiusInput();
  if ( radiusObject == ITK_NULLPTR )
    {
    itkExceptionMacro("Radius input is missing");
    }
  // FIXME : What should follow here ?
  //
  // const RadiusType radius = radiusObject->Get();
  //
}
template< typename TSample >
void
NeighborhoodSampler< TSample >
::PrintSelf(std::ostream & os, Indent indent) const
{
  this->Superclass::PrintSelf(os, indent);
  // m_Radius
  os << indent << "Radius: " << this->GetRadiusInput() << std::endl;
}
} // end of namespace Statistics
} // end of namespace itk
#endif
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