TFormulaPrimitive

class TFormulaPrimitive : public TNamed

    protected:

      static Int_t BuildBasicFormulas()

    public:

                                TFormulaPrimitive()
                                TFormulaPrimitive(const char* name, const char* formula, TFormulaPrimitive::GenFunc0 fpointer)
                                TFormulaPrimitive(const char* name, const char* formula, TFormulaPrimitive::GenFuncG fpointer, Int_t npar)
                                TFormulaPrimitive(const char* name, const char* formula, TFormulaPrimitive::TFunc0 fpointer)
                                TFormulaPrimitive(const TFormulaPrimitive&)
                                ~TFormulaPrimitive()
                   static Int_t AddFormula(TFormulaPrimitive* formula)
                 static TClass* Class()
                       Double_t Eval(Double_t* x)
                       Double_t Eval(TObject* o, Double_t* x)
                       Double_t Eval(Double_t* x, Double_t* param)
      static TFormulaPrimitive* FindFormula(const char* name)
                virtual TClass* IsA() const
             TFormulaPrimitive& operator=(const TFormulaPrimitive&)
                   virtual void ShowMembers(TMemberInspector& insp, char* parent)
                   virtual void Streamer(TBuffer& b)
                           void StreamerNVirtual(TBuffer& b)

Data Members

    protected:

      static TObjArray* fgListOfFunction  !list of global primitive formulas 
                  void* fFuncG            //!pointer to the TFormula generic function
                  void* fFunc0            //!pointer to the function
                  void* fFunc10           //!pointer to the function
                  void* fFunc110          //!pointer to the function
                  void* fFunc1110         //!pointer to the function
           G__p2memfunc fTFuncG           !pointer to the TFormula generic function
           G__p2memfunc fTFunc0           //! pointer to member function
           G__p2memfunc fTFunc10          //! pointer to member function
           G__p2memfunc fTFunc110         //! pointer to member function
           G__p2memfunc fTFunc1110        //! pointer to member function
                  Int_t fType             type of the function  
                  Int_t fNArguments       number of arguments
                  Int_t fNParameters      number of parameters
                 Bool_t fIsStatic         indication if the function is static

______________________________________________________________________________
 The Formula Primitive class

    Helper class for TFormula to speed up TFormula evaluation
    TFormula can use all functions registered in the list of TFormulaPrimitives
    User can add new function to the list of primitives
    if FormulaPrimitive with given name is already defined new primitive is ignored
    Example:
      TFormulaPrimitive::AddFormula(new TFormulaPrimitive("Pow2","Pow2",TFastFun::Pow2));
      TF1 f1("f1","Pow2(x)");



    TFormulaPrimitive is used to get direct acces to the function pointers
    GenFunc     -  pointers  to the static function
    TFunc       -  pointers  to the data member functions

    The following sufixes are currently used, to describe function arguments:
    ------------------------------------------------------------------------
    G     - generic layout - pointer to double (arguments), pointer to double (parameters)
    10    - double
    110   - double, double
    1110  - double, double, double

 Default constructor.

 Constructor.

 Constructor.

 Constructor.

 Constructor.

 Find the formula in the list of formulas.

 Add formula to the list of primitive formulas.
 If primitive formula already defined do nothing.

 Eval primitive function at point x.

 Eval member function of object o at point x.

 Eval primitive parametric function.

 Built-in functions.