// -*- C++ -*- // $Id: ReverseExponential.hh,v 1.2 2003/09/06 14:04:13 boudreau 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" namespace Genfun { /** * @author * @ingroup 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; }; } // namespace Genfun #endif