itkNeighborhoodAllocator.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkNeighborhoodAllocator.h,v $
  Language:  C++
  Date:      $Date: 2004/04/07 13:34:55 $
  Version:   $Revision: 1.13 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __itkNeighborhoodAllocator_h
#define __itkNeighborhoodAllocator_h
#include <iostream>

namespace itk {
template <class TPixel>
class NeighborhoodAllocator
{
public:
  typedef NeighborhoodAllocator Self;
  
  typedef TPixel * iterator;
  typedef const TPixel * const_iterator;
  
  NeighborhoodAllocator() : m_ElementCount(0), m_Data(0)  {}

  ~NeighborhoodAllocator()
    { this->Deallocate(); }

  void Allocate(unsigned int n)
  {
    m_Data = new TPixel[n];
    m_ElementCount = n;    
  }

  void Deallocate()
  {
    if (m_Data) delete[] m_Data;
    m_ElementCount = 0;
  }

  NeighborhoodAllocator(const Self& other) : m_ElementCount(0), m_Data(0)
  {
    this->set_size(other.m_ElementCount);
    for (unsigned int i = 0; i < other.m_ElementCount; ++i)
      this->operator[](i) = other[i];
    m_ElementCount = other.m_ElementCount;
  }

  const Self& operator=(const Self& other)
  {
    this->set_size(other.m_ElementCount);
    for (unsigned int i = 0; i < other.m_ElementCount; ++i)
      this->operator[](i) = other[i];
    m_ElementCount = other.m_ElementCount;
    return *this;
  }

  bool operator==(const Self& other) const
  {
    return (m_Data == other.m_Data);
  }

  bool operator!=(const Self& other) const
  {
    return (m_Data != other.m_Data);
  }

  iterator begin()
    { return m_Data; }
  const_iterator begin() const
    { return m_Data; }
  iterator end()
    { return (m_Data + m_ElementCount); }
  const_iterator end() const
    { return (m_Data + m_ElementCount); }
  unsigned int size() const
    { return m_ElementCount; }
    
  const TPixel & operator[](unsigned int i) const
    { return m_Data[i]; }
  TPixel &operator[](unsigned int i)
    { return m_Data[i]; }
  
  void set_size(unsigned int n)
    {
    if (m_Data) { Deallocate(); }
    this->Allocate(n);
    }

protected:
  unsigned int m_ElementCount;
  TPixel *m_Data;
};

template<class TPixel>
inline std::ostream& operator<<(std::ostream &o, const NeighborhoodAllocator<TPixel>
                                & a)
{
    o << "NeighborhoodAllocator { this = " << &a << ", begin = "
      << static_cast<const void *>(a.begin())
      << ", size=" << a.size()
      << " }";
      //      << ", contents:{ ";
      //    for (int i = 0; i < a.size(); ++i) o << a[i] << " ";
    o << " } }";
  return o;
}
  


} // end namespace itk
#endif

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