itkHeavisideStepFunctionBase.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkHeavisideStepFunctionBase.h,v $
  Language:  C++
  Date:      $Date: 2009-05-09 21:06:28 $
  Version:   $Revision: 1.1 $

  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 __itkHeavisideStepFunctionBase_h
#define __itkHeavisideStepFunctionBase_h

#include "itkFunctionBase.h"

namespace itk
{

template< typename TInput = float, typename TOutput = double >
class HeavisideStepFunctionBase : public FunctionBase< TInput, TOutput >
{
public:
  typedef HeavisideStepFunctionBase         Self;
  typedef FunctionBase< TInput, TOutput >   Superclass;
  typedef SmartPointer<Self>                Pointer;
  typedef SmartPointer<const Self>          ConstPointer;

  typedef typename Superclass::InputType    InputType;
  typedef typename Superclass::OutputType   OutputType;

  virtual OutputType Evaluate( const InputType& input ) const = 0;

  virtual OutputType EvaluateDerivative( const InputType& input ) const = 0;

protected:
  HeavisideStepFunctionBase() {}
  virtual ~HeavisideStepFunctionBase() {}

private:
  HeavisideStepFunctionBase(const Self& ); //purposely not implemented
  void operator=(const Self& ); //purposely not implemented

};

}

#endif