CLHEP/GenericFunctions/ReverseExponential.hh
// -*- C++ -*-
// $Id: ReverseExponential.hh,v 1.2 2001/05/16 05:10:36 joeb Exp $
//---------------------ReverseExponential-----------------------------------//
// //
// Class ReverseExponential..like Exponential but appropriate for describing//
// negative lifetime tails. //
// Joe Boudreau, Petar Maksimovic, November 1999 //
// //
//--------------------------------------------------------------------------//
#ifndef ReverseExponential_h
#define ReverseExponential_h 1
#include "CLHEP/GenericFunctions/AbsFunction.hh"
#include "CLHEP/GenericFunctions/Parameter.hh"
HEP_BEGIN_NAMESPACE(Genfun)
class ReverseExponential : public AbsFunction {
FUNCTION_OBJECT_DEF(ReverseExponential)
public:
// Constructor
ReverseExponential();
// Copy constructor
ReverseExponential(const ReverseExponential &right);
// Destructor
virtual ~ReverseExponential();
// Retreive function value
virtual double operator ()(double argument) const;
virtual double operator ()(const Argument & a) const {return operator() (a[0]);}
// Get the decay constant
Parameter & decayConstant();
// 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 an adjustable constant
const ReverseExponential & operator=(const ReverseExponential &right);
// Here is the decay constant
Parameter _decayConstant;
};
HEP_END_NAMESPACE(Genfun)
#endif
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