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00001 // -*- C++ -*- 00002 // $Id: Exponential.hh,v 1.2 2003/09/06 14:04:13 boudreau Exp $ 00003 //---------------------Exponential------------------------------------------// 00004 // // 00005 // Class Exponential // 00006 // Joe Boudreau, Petar Maksimovic, November 1999 // 00007 // // 00008 //--------------------------------------------------------------------------// 00009 #ifndef Exponential_h 00010 #define Exponential_h 1 00011 #include "CLHEP/GenericFunctions/AbsFunction.hh" 00012 #include "CLHEP/GenericFunctions/Parameter.hh" 00013 00014 namespace Genfun { 00015 00020 class Exponential : public AbsFunction { 00021 00022 FUNCTION_OBJECT_DEF(Exponential) 00023 00024 public: 00025 00026 // Constructor 00027 Exponential(); 00028 00029 // Copy constructor 00030 Exponential(const Exponential &right); 00031 00032 // Destructor 00033 virtual ~Exponential(); 00034 00035 // Retreive function value 00036 virtual double operator ()(double argument) const; 00037 virtual double operator ()(const Argument & a) const {return operator() (a[0]);} 00038 00039 // Get the decay constant 00040 Parameter & decayConstant(); 00041 const Parameter & decayConstant() const; 00042 00043 // Derivative. 00044 Derivative partial (unsigned int) const; 00045 00046 // Does this function have an analytic derivative? 00047 virtual bool hasAnalyticDerivative() const {return true;} 00048 00049 private: 00050 00051 // It is illegal to assign an adjustable constant 00052 const Exponential & operator=(const Exponential &right); 00053 00054 // Here is the decay constant 00055 Parameter _decayConstant; 00056 00057 }; 00058 } // namespace Genfun 00059 #endif