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
 
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;
};
 
  }  // namespace Minuit2
 
}  // namespace ROOT
 
#endif  // ROOT_Minuit2_GradientCalculator