CLHEP/GenericFunctions/ParamToArgAdaptor.hh
// -*- C++ -*-
// $Id: ParamToArgAdaptor.hh,v 1.2 2001/06/18 13:53:13 evc Exp $
//-----------------------Class ParaToArgAdaptor-----------------------------//
// //
// Joe Boudreau //
// January 2000 //
// //
// This class changes the interpretation of a function's PARAMETER and //
// turns it into an argument. In other words it makes a function like //
// //
// F(a_0, a_1, a_2; x) //
// //
// and reinterprets it as //
// //
// F(a_0, a_2; x, a_1) //
// //
// //
//--------------------------------------------------------------------------//
#ifndef ParamToArgAdaptor_h_
#define ParamToArgAdaptor_h_
#include <functional>
#include "CLHEP/config/CLHEP.h"
#include "CLHEP/config/iostream.h"
#include <string>
#include "CLHEP/GenericFunctions/Parameter.hh"
#include "CLHEP/GenericFunctions/AbsFunction.hh"
HEP_BEGIN_NAMESPACE(Genfun)
template <class F>
class ParamToArgAdaptor : public AbsFunction {
FUNCTION_OBJECT_DEF(ParamToArgAdaptor)
public:
// ScopedMethodName
typedef Parameter & (F::*ScopedMethodPtr) ();
// Constructor
ParamToArgAdaptor(const F & function,
ScopedMethodPtr parameterFetchMethod);
// Copy constructor
ParamToArgAdaptor(const ParamToArgAdaptor &right);
// Destructor
virtual ~ParamToArgAdaptor();
// Retreive function value
virtual double operator ()(double argument) const; // Gives an error.
virtual double operator ()(const Argument & a) const; // Must use this one
// Dimensionality
virtual unsigned int dimensionality() const;
// Get the mean of the ParamToArgAdaptor
Parameter & scaleFactor();
const Parameter & scaleFactor() const;
private:
// It is illegal to assign an adjustable constant
const ParamToArgAdaptor & operator=(const ParamToArgAdaptor &right);
// Here is the sigma
Parameter _scaleFactor;
// Here is the function being adapted;
F *_function;
// Here is the recipe for fetching the parameter from the function:
std::mem_fun_ref_t<Parameter &, F> _parameterFetchMethod;
};
HEP_END_NAMESPACE(Genfun)
#include "CLHEP/GenericFunctions/ParamToArgAdaptor.icc"
#endif
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