itkHeavisideStepFunctionBase.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.
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#ifndef __itkHeavisideStepFunctionBase_h
#define __itkHeavisideStepFunctionBase_h

#include "itkFunctionBase.h"
#include "itkConceptChecking.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;

  itkTypeMacro ( HeavisideStepFunctionBase, FunctionBase );


  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;

#ifdef ITK_USE_CONCEPT_CHECKING
  itkConceptMacro( DoubleConvertibleToInputCheck,
                 ( Concept::Convertible< double, TInput > ) );

  itkConceptMacro( DoubleConvertibleToOutputCheck,
                 ( Concept::Convertible< double, TOutput > ) );
#endif // ITK_USE_CONCEPT_CHECKING

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

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

#endif