CLHEP/GenericFunctions/Sigma.hh

0001 // -*- C++ -*-
0002 // $Id:
0003 //--------------------------Sigma-------------------------------------------//
0004 //                                                                          //
0005 // Sigma, result of addition of N functions                                 //
0006 //                                                                          //
0007 //--------------------------------------------------------------------------//
0008
0009 #ifndef Sigma_h
0010 #define Sigma_h 1
0011 #include "CLHEP/GenericFunctions/AbsFunction.hh"
0012
0013 namespace Genfun {
0014
0015   /**
0016    * @author
0017    * @ingroup genfun
0018    */
0019   class Sigma : public AbsFunction  {
0020
0021     FUNCTION_OBJECT_DEF(Sigma)
0022
0023       public:
0024
0025     // Constructor
0026     Sigma();
0027
0028     // Copy constructor
0029     Sigma(const Sigma &right);
0030
0031     // Destructor
0032     virtual ~Sigma();
0033
0034     // Retreive function value
0035     virtual double operator ()(double argument) const override;
0036     virtual double operator ()(const Argument & a) const override;
0037
0038     // Dimensionality
0039     virtual unsigned int dimensionality() const override;
0040
0041     // Derivative.
0042     Derivative partial (unsigned int) const override;
0043
0044     // Does this function have an analytic derivative?
0045     virtual bool hasAnalyticDerivative() const override {return true;}
0046
0047     // Add a function to the sum:
0048     void accumulate (const AbsFunction & fcn);
0049
0050   private:
0051
0052     // It is illegal to assign a Sigma
0053     const Sigma & operator=(const Sigma &right);
0054
0055     std::vector<const AbsFunction *> _fcn;
0056
0057   };
0058 } // namespace Genfun
0059 #endif