File: itkImageLinearIteratorWithIndex.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://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 itkImageLinearIteratorWithIndex_h
#define itkImageLinearIteratorWithIndex_h

#include "itkImageLinearConstIteratorWithIndex.h"
#include "itkImageIteratorWithIndex.h"

namespace itk
{
/** \class ImageLinearIteratorWithIndex
 * \brief A multi-dimensional image iterator that visits image pixels within a
 * region in a "scan-line" order.
 *
 *  This iterator is a subclass of itk::ImageLinearConstIteratorWithIndex that
 *  adds write-access functionality.  Please see
 *  itk::ImageLinearConstIteratorWithIndex for more information.
 *
 * \par MORE INFORMATION
 * For a complete description of the ITK Image Iterators and their API, please
 * see the Iterators chapter in the ITK Software Guide.  The ITK Software Guide
 * is available in print and as a free .pdf download from https://www.itk.org.
 *
 * \ingroup ImageIterators
 *
 * \sa ImageConstIterator \sa ConditionalConstIterator
 * \sa ConstNeighborhoodIterator \sa ConstShapedNeighborhoodIterator
 * \sa ConstSliceIterator  \sa CorrespondenceDataStructureIterator
 * \sa FloodFilledFunctionConditionalConstIterator
 * \sa FloodFilledImageFunctionConditionalConstIterator
 * \sa FloodFilledImageFunctionConditionalIterator
 * \sa FloodFilledSpatialFunctionConditionalConstIterator
 * \sa FloodFilledSpatialFunctionConditionalIterator
 * \sa ImageConstIterator \sa ImageConstIteratorWithIndex
 * \sa ImageIterator \sa ImageIteratorWithIndex
 * \sa ImageLinearConstIteratorWithIndex  \sa ImageLinearIteratorWithIndex
 * \sa ImageRandomConstIteratorWithIndex  \sa ImageRandomIteratorWithIndex
 * \sa ImageRegionConstIterator \sa ImageRegionConstIteratorWithIndex
 * \sa ImageRegionExclusionConstIteratorWithIndex
 * \sa ImageRegionExclusionIteratorWithIndex
 * \sa ImageRegionIterator  \sa ImageRegionIteratorWithIndex
 * \sa ImageRegionReverseConstIterator  \sa ImageRegionReverseIterator
 * \sa ImageReverseConstIterator  \sa ImageReverseIterator
 * \sa ImageSliceConstIteratorWithIndex  \sa ImageSliceIteratorWithIndex
 * \sa NeighborhoodIterator \sa PathConstIterator  \sa PathIterator
 * \sa ShapedNeighborhoodIterator  \sa SliceIterator
 * \sa ImageConstIteratorWithIndex
 *
 * \ingroup ITKCommon
 */
template <typename TImage>
class ITK_TEMPLATE_EXPORT ImageLinearIteratorWithIndex : public ImageLinearConstIteratorWithIndex<TImage>
{
public:
  /** Standard class type aliases. */
  using Self = ImageLinearIteratorWithIndex;
  using Superclass = ImageLinearConstIteratorWithIndex<TImage>;

  /** Types inherited from the Superclass */
  using typename Superclass::IndexType;
  using typename Superclass::SizeType;
  using typename Superclass::OffsetType;
  using typename Superclass::RegionType;
  using typename Superclass::ImageType;
  using typename Superclass::PixelContainer;
  using typename Superclass::PixelContainerPointer;
  using typename Superclass::InternalPixelType;
  using typename Superclass::PixelType;
  using typename Superclass::AccessorType;

  /** Default constructor. Needed since we provide a cast constructor. */
  ImageLinearIteratorWithIndex() = default;

  /** Constructor establishes an iterator to walk a particular image and a
   * particular region of that image. */
  ImageLinearIteratorWithIndex(ImageType * ptr, const RegionType & region);

  /** Constructor that can be used to cast from an ImageIterator to an
   * ImageLinearIteratorWithIndex. Many routines return an ImageIterator, but for a
   * particular task, you may want an ImageLinearIteratorWithIndex.  Rather than
   * provide overloaded APIs that return different types of Iterators, itk
   * returns ImageIterators and uses constructors to cast from an
   * ImageIterator to a ImageLinearIteratorWithIndex. */
  ImageLinearIteratorWithIndex(const ImageIteratorWithIndex<TImage> & it);

  /** Set the pixel value */
  void
  Set(const PixelType & value) const
  {
    this->m_PixelAccessorFunctor.Set(*(const_cast<InternalPixelType *>(this->m_Position)), value);
  }

  /** Return a reference to the pixel.
   * This method will provide the fastest access to pixel
   * data, but it will NOT support ImageAdaptors. */
  PixelType &
  Value()
  {
    return *(const_cast<InternalPixelType *>(this->m_Position));
  }

protected:
  /** the construction from a const iterator is declared protected
      in order to enforce const correctness. */
  ImageLinearIteratorWithIndex(const ImageLinearConstIteratorWithIndex<TImage> & it);
  Self &
  operator=(const ImageLinearConstIteratorWithIndex<TImage> & it);
};
} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkImageLinearIteratorWithIndex.hxx"
#endif

#endif