GenericFunction.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_GenericFunction
#define ROOT_Minuit2_GenericFunction
 
#include "Minuit2/MnConfig.h"
 
#include <ROOT/RSpan.hxx>
 
#include <vector>
 
namespace ROOT {
 
namespace Minuit2 {
 
//_____________________________________________________________________
/**
 
Class from which all the other classes, representing functions,
inherit. That is why it defines only one method, the operator(),
which allows to call the function.
 
@author Andras Zsenei and Lorenzo Moneta, Creation date: 23 Sep 2004
 
@ingroup Minuit
 
 */
 
class GenericFunction {
 
public:
   virtual ~GenericFunction() {}
 
   /**
 
      Evaluates the function using the vector containing the input values.
 
      @param x vector of the coordinates (for example the x coordinate for a
      one-dimensional Gaussian)
 
      @return the result of the evaluation of the function.
 
   */
 
   virtual double operator()(std::vector<double> const& x) const = 0;
};
 
} // namespace Minuit2
 
} // namespace ROOT
 
#endif // ROOT_Minuit2_GenericFunction