vtkDICOMReferenceCount.h

/*=========================================================================
 
  Program: DICOM for VTK
 
  Copyright (c) 2012-2024 David Gobbi
  All rights reserved.
  See Copyright.txt or http://dgobbi.github.io/bsd3.txt 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 notice for more information.
 
=========================================================================*/
#ifndef vtkDICOMReferenceCount_h
#define vtkDICOMReferenceCount_h
 
#include "vtkSystemIncludes.h"
#include "vtkDICOMModule.h" // For export macro
 
 
class VTKDICOM_EXPORT vtkDICOMReferenceCount
{
public:
  vtkDICOMReferenceCount(unsigned int i) : Counter(i) {}
  vtkDICOMReferenceCount() : Counter(0) {}
 
  unsigned int operator--();
  unsigned int operator++();
 
  bool operator==(unsigned int x) const {
    return this->Counter == x; }
  bool operator!=(unsigned int x) const {
    return this->Counter != x; }
 
private:
  unsigned int Counter;
};
 
#if !defined(_WIN32)
inline unsigned int vtkDICOMReferenceCount::operator--()
{
#if defined(VTK_HAVE_SYNC_BUILTINS)
  return __sync_sub_and_fetch(&this->Counter, 1);
#else
  return --this->Counter;
#endif
}
#endif
 
#if !defined(_WIN32)
inline unsigned int vtkDICOMReferenceCount::operator++()
{
#if defined(VTK_HAVE_SYNC_BUILTINS)
  return __sync_add_and_fetch(&this->Counter, 1);
#else
  return ++this->Counter;
#endif
}
#endif
 
#endif /* vtkDICOMReferenceCount_h */
// VTK-HeaderTest-Exclude: vtkDICOMReferenceCount.h