itkConjugateGradientOptimizer.h

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 *  Copyright Insight Software Consortium
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 *  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
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 *  distributed under the License is distributed on an "AS IS" BASIS,
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 *  See the License for the specific language governing permissions and
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#ifndef __itkConjugateGradientOptimizer_h
#define __itkConjugateGradientOptimizer_h

#include "itkIntTypes.h"
#include "itkSingleValuedNonLinearVnlOptimizer.h"
#include "vnl/algo/vnl_conjugate_gradient.h"

namespace itk
{
class ConjugateGradientOptimizer:
  public SingleValuedNonLinearVnlOptimizer

{
public:
  typedef ConjugateGradientOptimizer        Self;
  typedef SingleValuedNonLinearVnlOptimizer Superclass;
  typedef SmartPointer< Self >              Pointer;
  typedef SmartPointer< const Self >        ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(ConjugateGradientOptimizer, SingleValuedNonLinearOptimizer);

  typedef   vnl_vector< double > InternalParametersType;

  typedef   vnl_conjugate_gradient InternalOptimizerType;

  vnl_conjugate_gradient * GetOptimizer(void);

  virtual void StartOptimization(void) ITK_OVERRIDE;

  virtual void SetCostFunction(SingleValuedCostFunction *costFunction) ITK_OVERRIDE;

  SizeValueType GetNumberOfIterations(void) const;

  SizeValueType GetCurrentIteration(void) const;

  MeasureType GetValue() const;

protected:
  ConjugateGradientOptimizer();
  virtual ~ConjugateGradientOptimizer();

  typedef Superclass::CostFunctionAdaptorType CostFunctionAdaptorType;

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

  bool                   m_OptimizerInitialized;
  InternalOptimizerType *m_VnlOptimizer;
};
} // end namespace itk

#endif