CastAccessor.hpp

#ifndef IMAGE_CASTACCESSOR_H
#define IMAGE_CASTACCESSOR_H


#include <image/ImageAccessorInterface.hpp>

namespace imaging
{

  template <class image_t, class DATA_t = float_t>
  class CastAccessor : public ImageAccessorInterface<image_t, DATA_t>
  {
  public:
    static const size_t dimension = ImageAccessorInterface<image_t, DATA_t>::dimension;
    typedef DATA_t data_t;

  private:
    class data_reference
    {
      CastAccessor<image_t, DATA_t> & _accessor_reference;
      const ublas::fixed_vector<size_t, dimension> & _index_reference;

    public:
      data_reference(CastAccessor<image_t, DATA_t> & accessor, const ublas::fixed_vector<size_t, dimension> & index) : _accessor_reference(accessor), _index_reference(index) {}

      DATA_t operator=(const DATA_t & input)
      { _accessor_reference._image_reference[_index_reference] = (typename image_t::data_t)(input); return input; }

      operator DATA_t() const { return DATA_t(_accessor_reference._image_reference[_index_reference]); }
    };
  public:
    CastAccessor(image_t & image) : ImageAccessorInterface<image_t, DATA_t>(image) {}

    DATA_t operator[](const ublas::fixed_vector<size_t, dimension> & index) const { return DATA_t(ImageAccessorInterface<image_t, DATA_t>::_image_reference[index]); }
    data_reference operator[](const ublas::fixed_vector<size_t, dimension> & index) { return data_reference(*this, index); }
  };

}

#endif

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