Sigma.hh

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// -*- C++ -*-
// $Id: 
//--------------------------Sigma-------------------------------------------//
//                                                                          //
// Sigma, result of addition of N functions                                 //
//                                                                          //
//--------------------------------------------------------------------------//
 
#ifndef Sigma_h
#define Sigma_h 1
#include "CLHEP/GenericFunctions/AbsFunction.hh"
 
namespace Genfun {
 
  /**
   * @author
   * @ingroup genfun
   */
  class Sigma : public AbsFunction  {
 
    FUNCTION_OBJECT_DEF(Sigma)
  
      public:
  
    // Constructor
    Sigma();
  
    // Copy constructor
    Sigma(const Sigma &right);
 
    // Destructor
    virtual ~Sigma();
  
    // Retreive function value
    virtual double operator ()(double argument) const override;
    virtual double operator ()(const Argument & a) const override;
 
    // Dimensionality 
    virtual unsigned int dimensionality() const override;
 
    // Derivative.  
    Derivative partial (unsigned int) const override;
 
    // Does this function have an analytic derivative?
    virtual bool hasAnalyticDerivative() const override {return true;}
 
    // Add a function to the sum:
    void accumulate (const AbsFunction & fcn);
 
  private:
 
    // It is illegal to assign a Sigma
    const Sigma & operator=(const Sigma &right);
 
    std::vector<const AbsFunction *> _fcn;
 
  };
} // namespace Genfun
#endif