itkKernelFunctionBase.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.
 *
 *=========================================================================*/
#ifndef __itkKernelFunctionBase_h
#define __itkKernelFunctionBase_h

#include "itkFunctionBase.h"
#include "itkConceptChecking.h"
#include "itkNumericTraits.h"
#include "vnl/vnl_math.h"

namespace itk
{
template< typename TRealValueType = double >
class KernelFunctionBase:public FunctionBase< TRealValueType, TRealValueType >
{
public:
  typedef KernelFunctionBase                             Self;
  typedef FunctionBase< TRealValueType, TRealValueType > Superclass;
  typedef SmartPointer< Self >                           Pointer;
  typedef SmartPointer< const Self >                     ConstPointer;

  typedef TRealValueType                             RealType;

  itkTypeMacro(KernelFunctionBase, FunctionBase);

  virtual TRealValueType Evaluate(const TRealValueType & u) const = 0;

#ifdef ITK_USE_STRICT_CONCEPT_CHECKING
    // Begin concept checking
    itkConceptMacro( TRealValueTypeIsFloatingPointCheck,
                         ( Concept::IsFloatingPoint< TRealValueType > ) );
      // End concept checking
#endif

protected:
  KernelFunctionBase() {};
  virtual ~KernelFunctionBase() {};
  void PrintSelf(std::ostream & os, Indent indent) const
  { Superclass::PrintSelf(os, indent); }
};
} // end namespace itk

#endif // __itkKernelFunctionBase_h