FCNAdapter.h

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// @(#)root/minuit2:$Id$
// Author: L. Moneta    10/2006
 
/**********************************************************************
 *                                                                    *
 * Copyright (c) 2006 ROOT Foundation,  CERN/PH-SFT                   *
 *                                                                    *
 **********************************************************************/
 
#ifndef ROOT_Minuit2_FCNAdapter
#define ROOT_Minuit2_FCNAdapter
 
#include "Minuit2/FCNBase.h"
 
#include <vector>
 
namespace ROOT {
 
namespace Minuit2 {
 
/**
 
 
template wrapped class for adapting to FCNBase signature
 
@author Lorenzo Moneta
 
@ingroup Minuit
 
*/
 
template <class Function>
class FCNAdapter : public FCNBase {
 
public:
   FCNAdapter(const Function &f, double up = 1.) : fFunc(f), fUp(up) {}
 
   ~FCNAdapter() override {}
 
   double operator()(const std::vector<double> &v) const override { return fFunc.operator()(&v[0]); }
   double operator()(const double *v) const { return fFunc.operator()(v); }
   double Up() const override { return fUp; }
 
   void SetErrorDef(double up) override { fUp = up; }
 
   // virtual std::vector<double> Gradient(const std::vector<double>&) const;
 
   // forward interface
   // virtual double operator()(int npar, double* params,int iflag = 4) const;
 
private:
   const Function &fFunc;
   double fUp;
};
 
} // end namespace Minuit2
 
} // end namespace ROOT
 
#endif // ROOT_Minuit2_FCNAdapter