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00001 // -*- C++ -*- 00002 // $Id: 00003 //--------------------------Sigma-------------------------------------------// 00004 // // 00005 // Sigma, result of addition of N functions // 00006 // // 00007 //--------------------------------------------------------------------------// 00008 00009 #ifndef Sigma_h 00010 #define Sigma_h 1 00011 #include "CLHEP/GenericFunctions/AbsFunction.hh" 00012 00013 namespace Genfun { 00014 00019 class Sigma : public AbsFunction { 00020 00021 FUNCTION_OBJECT_DEF(Sigma) 00022 00023 public: 00024 00025 // Constructor 00026 Sigma(); 00027 00028 // Copy constructor 00029 Sigma(const Sigma &right); 00030 00031 // Destructor 00032 virtual ~Sigma(); 00033 00034 // Retreive function value 00035 virtual double operator ()(double argument) const; 00036 virtual double operator ()(const Argument & a) const; 00037 00038 // Dimensionality 00039 virtual unsigned int dimensionality() const; 00040 00041 // Derivative. 00042 Derivative partial (unsigned int) const; 00043 00044 // Does this function have an analytic derivative? 00045 virtual bool hasAnalyticDerivative() const {return true;} 00046 00047 // Add a function to the sum: 00048 void accumulate (const AbsFunction & fcn); 00049 00050 private: 00051 00052 // It is illegal to assign a Sigma 00053 const Sigma & operator=(const Sigma &right); 00054 00055 std::vector<const AbsFunction *> _fcn; 00056 00057 }; 00058 } // namespace Genfun 00059 #endif