itkConditionalConstIterator.h

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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 __itkConditionalConstIterator_h
#define __itkConditionalConstIterator_h

#include "itkIndex.h"

namespace itk
{
template< class TImage >
class ConditionalConstIterator
{
public:
  typedef ConditionalConstIterator Self;

  itkStaticConstMacro(NDimension, unsigned int, TImage::ImageDimension);

  typedef typename TImage::IndexType IndexType;

  typedef typename TImage::SizeType SizeType;

  typedef typename TImage::RegionType RegionType;

  typedef TImage ImageType;

  typedef typename TImage::InternalPixelType InternalPixelType;

  typedef typename TImage::PixelType PixelType;

  virtual bool IsPixelIncluded(const IndexType & index) const = 0;

  Self & operator=(const Self & it)
  {
    m_IsAtEnd = it.m_IsAtEnd; // copy the end flag
    m_Image = it.m_Image;     // copy the smart pointer
    m_Region = it.m_Region;   // copy the region
    return *this;
  }

  static unsigned int GetIteratorDimension(void)
  {
    return Self::NDimension;
  }

  virtual const IndexType GetIndex() = 0;

  virtual const PixelType & Get(void) const = 0;

  virtual bool IsAtEnd() = 0;

  virtual void operator++() = 0;

  ConditionalConstIterator();

  virtual ~ConditionalConstIterator();
protected: //made protected so other iterators can access

  //SmartPointer<const ImageType> m_Image;
  typename ImageType::ConstWeakPointer m_Image;

  RegionType m_Region;

  bool m_IsAtEnd;
};
} // end namespace itk

// Define instantiation macro for this template.
#define ITK_TEMPLATE_ConditionalConstIterator(_, EXPORT, TypeX, TypeY)     \
  namespace itk                                                            \
  {                                                                        \
  _( 1 ( class EXPORT ConditionalConstIterator< ITK_TEMPLATE_1 TypeX > ) ) \
  namespace Templates                                                      \
  {                                                                        \
  typedef ConditionalConstIterator< ITK_TEMPLATE_1 TypeX >                 \
  ConditionalConstIterator##TypeY;                                       \
  }                                                                        \
  }

#if ITK_TEMPLATE_EXPLICIT
//HACK attempt to make static const unsigned ints work  template<class TImage>
// const unsigned int ConditionalConstIterator<TImage>::ImageDimension;
#include "Templates/itkConditionalConstIterator+-.h"
#endif

#if ITK_TEMPLATE_TXX
#include "itkConditionalConstIterator.hxx"
#endif

#endif