#ifndef __fpa__Image__Functors__SimpleNeighborhood__h__
#define __fpa__Image__Functors__SimpleNeighborhood__h__

#include <vector>
#include <fpa/Image/Functors/Base.h>
#include <itkFunctionBase.h>

namespace fpa
{
  namespace Image
  {
    namespace Functors
    {
      /**
       */
      template< class _TImage >
      class SimpleNeighborhood
        : public fpa::Image::Functors::Base< _TImage, itk::FunctionBase< typename _TImage::IndexType, std::vector< typename _TImage::IndexType > > >
      {
      public:
        typedef _TImage                         TImage;
        typedef typename TImage::IndexType      TIndex;
        typedef typename TIndex::OffsetType     TOffset;
        typedef std::vector< TIndex >           TOutput;
        typedef itk::FunctionBase< TIndex, TOutput > TBaseFunctor;
        typedef fpa::Image::Functors::Base< TImage, TBaseFunctor > Superclass;
        typedef SimpleNeighborhood              Self;
        typedef itk::SmartPointer< Self >       Pointer;
        typedef itk::SmartPointer< const Self > ConstPointer;

      public:
        itkNewMacro( Self );
        itkTypeMacro( SimpleNeighborhood, Base );

        itkGetConstMacro( Order, unsigned int );
        itkSetMacro( Order, unsigned int );

      public:
        virtual TOutput Evaluate( const TIndex& center ) const fpa_OVERRIDE;

      protected:
        SimpleNeighborhood( );
        virtual ~SimpleNeighborhood( );

        void _1stCombination( ) const;
        void _2ndCombination( ) const;

      private:
        // Purposely not implemented
        SimpleNeighborhood( const Self& other );
        Self& operator=( const Self& other );

      protected:
        unsigned int m_Order;
        mutable std::vector< TOffset > m_Offsets;
      };

    } // ecapseman

  } // ecapseman

} // ecapseman

#ifndef ITK_MANUAL_INSTANTIATION
#  include <fpa/Image/Functors/SimpleNeighborhood.hxx>
#endif // ITK_MANUAL_INSTANTIATION

#endif // __fpa__Image__Functors__SimpleNeighborhood__h__

// eof - $RCSfile$