CLHEP/GenericFunctions/FixedConstant.hh
// -*- C++ -*-
// $Id: FixedConstant.hh,v 1.2 2001/05/16 05:10:31 joeb Exp $
//----------------------FixedConstant --------------------------------------//
// //
// Class FixedConstant //
// Joe Boudreau, Petar Maksimovic, Nov. 1999 //
// //
// FixedConstant allows use to treat "promote" fixed contants to constant //
// functions so that they automatically will inherit all the algebraic //
// operations we have so painstakingly defined for functions. //
// //
//--------------------------------------------------------------------------//
#ifndef FixedConstant_h
#define FixedConstant_h 1
#include "CLHEP/GenericFunctions/AbsFunction.hh"
HEP_BEGIN_NAMESPACE(Genfun)
class FixedConstant : public AbsFunction {
FUNCTION_OBJECT_DEF(FixedConstant)
public:
// Constructor
FixedConstant(double value);
// Copy constructor
FixedConstant(const FixedConstant &right);
// Destructor
virtual ~FixedConstant();
// 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 FixedConstant & operator=(const FixedConstant &right);
// The value of the constant:
double _value;
};
HEP_END_NAMESPACE(Genfun)
#endif
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