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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkTimeStamp.h,v $
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/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 notice for more information.
=========================================================================*/
// .NAME vtkTimeStamp - record modification and/or execution time
// .SECTION Description
// vtkTimeStamp records a unique time when the method Modified() is
// executed. This time is guaranteed to be monotonically increasing.
// Classes use this object to record modified and/or execution time.
// There is built in support for the binary < and > comparison
// operators between two vtkTimeStamp objects.
#ifndef __vtkTimeStamp_h
#define __vtkTimeStamp_h
#include "vtkSystemIncludes.h"
class VTK_COMMON_EXPORT vtkTimeStamp
{
public:
vtkTimeStamp() {this->ModifiedTime = 0;};
static vtkTimeStamp *New();
void Delete() {delete this;};
// Description:
// Set this objects time to the current time. The current time is
// just a monotonically increasing unsigned long integer. It is
// possible for this number to wrap around back to zero.
// This should only happen for processes that have been running
// for a very long time, while constantly changing objects
// within the program. When this does occur, the typical consequence
// should be that some filters will update themselves when really
// they don't need to.
void Modified();
// Description:
// Return this object's Modified time.
unsigned long int GetMTime() {return this->ModifiedTime;};
// Description:
// Support comparisons of time stamp objects directly.
int operator>(vtkTimeStamp& ts) {
return (this->ModifiedTime > ts.ModifiedTime);};
int operator<(vtkTimeStamp& ts) {
return (this->ModifiedTime < ts.ModifiedTime);};
// Description:
// Allow for typecasting to unsigned long.
operator unsigned long() {return this->ModifiedTime;};
private:
unsigned long ModifiedTime;
};
#endif
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