itkTimeStamp.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.
 *
 *=========================================================================*/
/*=========================================================================
 *
 *  Portions of this file are subject to the VTK Toolkit Version 3 copyright.
 *
 *  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
 *
 *  For complete copyright, license and disclaimer of warranty information
 *  please refer to the NOTICE file at the top of the ITK source tree.
 *
 *=========================================================================*/
#ifndef itkTimeStamp_h
#define itkTimeStamp_h

#include "itkMacro.h"
#include "itkIntTypes.h"
#include <atomic>
#include "itkSingletonMacro.h"

namespace itk
{
class ITKCommon_EXPORT TimeStamp
{
public:
  using Self = TimeStamp;

  using GlobalTimeStampType = std::atomic< ModifiedTimeType >;

  static Self * New();

  TimeStamp()
  { m_ModifiedTime = 0; }

  void Delete()
  { delete this; }

  static const char * GetNameOfClass()
  { return "TimeStamp"; }

  void Modified();

  ModifiedTimeType GetMTime() const
  { return m_ModifiedTime; }

  bool operator>(TimeStamp & ts)
  { return ( m_ModifiedTime > ts.m_ModifiedTime ); }
  bool operator<(TimeStamp & ts)
  { return ( m_ModifiedTime < ts.m_ModifiedTime ); }

  operator ModifiedTimeType() const
        { return m_ModifiedTime; }

  Self & operator=( const Self & other ) = default;

private:
  itkGetGlobalDeclarationMacro(GlobalTimeStampType, GlobalTimeStamp);

  ModifiedTimeType m_ModifiedTime;

  static GlobalTimeStampType *m_GlobalTimeStamp;
};
} // end namespace itk

#endif