CLHEP/GenericFunctions/FloatingConstant.hh
// -*- C++ -*-
// $Id: FloatingConstant.hh,v 1.2 2001/05/16 05:10:32 joeb Exp $
//----------------------FloatingConstant -----------------------------------//
// //
// Class FloatingConstant //
// Joe Boudreau, Petar Maksimovic, Nov. 1999 //
// //
// FloatingConstant allows use to treat constants as floating-constant //
// functions so that they automatically will inherit all the algebraic //
// operations we have so painstakingly defined for functions. //
// //
//--------------------------------------------------------------------------//
#ifndef FloatingConstant_h
#define FloatingConstant_h 1
#include "CLHEP/GenericFunctions/AbsFunction.hh"
#include "CLHEP/GenericFunctions/Parameter.hh"
HEP_BEGIN_NAMESPACE(Genfun)
class FloatingConstant : public AbsFunction {
FUNCTION_OBJECT_DEF(FloatingConstant)
public:
// Constructor
FloatingConstant(const AbsParameter & p);
// Copy constructor
FloatingConstant(const FloatingConstant &right);
// Destructor
virtual ~FloatingConstant();
// Retrieve the parameter:
AbsParameter & value();
// Retrieve function value
virtual double operator ()(double argument) const;
virtual double operator ()(const Argument & a) const {return operator() (a[0]);}
// Derivative.
Derivative partial (unsigned int) const;
// Does this function have an analytic derivative?
virtual bool hasAnalyticDerivative() const {return true;}
private:
// It is illegal to assign a fixed constant
const FloatingConstant & operator=(const FloatingConstant &right);
// The value of the constant:
AbsParameter *_value;
};
HEP_END_NAMESPACE(Genfun)
#endif
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