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CLHEP/GenericFunctions/ReverseExponential.hh
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1 // -*- C++ -*-
2 // $Id: ReverseExponential.hh,v 1.2 2003/09/06 14:04:13 boudreau Exp $
3 //---------------------ReverseExponential-----------------------------------//
4 // //
5 // Class ReverseExponential..like Exponential but appropriate for describing//
6 // negative lifetime tails. //
7 // Joe Boudreau, Petar Maksimovic, November 1999 //
8 // //
9 //--------------------------------------------------------------------------//
10 #ifndef ReverseExponential_h
11 #define ReverseExponential_h 1
14 namespace Genfun {
15 
21 
23 
24  public:
25 
26  // Constructor
28 
29  // Copy constructor
31 
32  // Destructor
33  virtual ~ReverseExponential();
34 
35  // Retreive function value
36  virtual double operator ()(double argument) const;
37  virtual double operator ()(const Argument & a) const {return operator() (a[0]);}
38 
39  // Get the decay constant
41 
42  // Derivative.
43  Derivative partial (unsigned int) const;
44 
45  // Does this function have an analytic derivative?
46  virtual bool hasAnalyticDerivative() const {return true;}
47 
48  private:
49 
50  // It is illegal to assign an adjustable constant
51  const ReverseExponential & operator=(const ReverseExponential &right);
52 
53  // Here is the decay constant
54  Parameter _decayConstant;
55 
56  };
57 } // namespace Genfun
58 
59 #endif
virtual double operator()(double argument) const
#define FUNCTION_OBJECT_DEF(classname)
Derivative partial(unsigned int) const