itkHeavisideStepFunctionBase.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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.
 *
 *=========================================================================*/
#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:
  ITK_DISALLOW_COPY_AND_MOVE(HeavisideStepFunctionBase);
 
  using Self = HeavisideStepFunctionBase;
  using Superclass = FunctionBase<TInput, TOutput>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  itkTypeMacro(HeavisideStepFunctionBase, FunctionBase);
 
 
  using InputType = typename Superclass::InputType;
  using OutputType = typename Superclass::OutputType;
 
  OutputType
  Evaluate(const InputType & input) const override = 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()
  {}
  ~HeavisideStepFunctionBase() override = default;
};
} // namespace itk
 
#endif