GradientCalculator.h

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// @(#)root/minuit2:$Id$
// Authors: M. Winkler, F. James, L. Moneta, A. Zsenei   2003-2005
 
/**********************************************************************
 *                                                                    *
 * Copyright (c) 2005 LCG ROOT Math team,  CERN/PH-SFT                *
 *                                                                    *
 **********************************************************************/
 
#ifndef ROOT_Minuit2_GradientCalculator
#define ROOT_Minuit2_GradientCalculator
 
#include "Minuit2/MnMatrixfwd.h"
 
namespace ROOT {
 
namespace Minuit2 {
 
class MinimumParameters;
class FunctionGradient;
 
/**
   interface class for gradient calculators
 */
class GradientCalculator {
 
public:
   virtual ~GradientCalculator() {}
 
   virtual FunctionGradient operator()(const MinimumParameters &) const = 0;
 
   virtual FunctionGradient operator()(const MinimumParameters &, const FunctionGradient &) const = 0;
 
   virtual bool Hessian(const MinimumParameters &, MnAlgebraicSymMatrix &) const { return false;}
 
   virtual bool G2(const MinimumParameters &, MnAlgebraicVector &) const { return false;}
 
   static bool SetParallelOMP(bool doParallel = true);
 
protected:
   static inline bool fDoParallelOMP = false; ///< flag to indicate if parallel OpenMP processing is used
};
 
} // namespace Minuit2
 
} // namespace ROOT
 
#endif // ROOT_Minuit2_GradientCalculator