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00001 // -*- C++ -*- 00002 // $Id: ConstPlusFunction.hh,v 1.2 2003/09/06 14:04:13 boudreau Exp $ 00003 //--------------------------ConstPlusFunction-------------------------------// 00004 // // 00005 // ConstPlusFunction, result of adding a function and a constant // 00006 // Joe Boudreau, Petar Maksimovic, November 1999 // 00007 // // 00008 //--------------------------------------------------------------------------// 00009 00010 #ifndef ConstPlusFunction_h 00011 #define ConstPlusFunction_h 1 00012 #include "CLHEP/GenericFunctions/AbsFunction.hh" 00013 00014 namespace Genfun { 00015 00020 class ConstPlusFunction : public AbsFunction { 00021 00022 FUNCTION_OBJECT_DEF(ConstPlusFunction) 00023 00024 public: 00025 00026 // Constructor 00027 ConstPlusFunction(double constant, const AbsFunction *arg); 00028 00029 // Copy constructor 00030 ConstPlusFunction(const ConstPlusFunction &right); 00031 00032 // Destructor 00033 virtual ~ConstPlusFunction(); 00034 00035 // Retreive function value 00036 virtual double operator ()(double argument) const; 00037 virtual double operator ()(const Argument & a) const; 00038 00039 // Dimensionality 00040 virtual unsigned int dimensionality() const; 00041 00042 // Derivative. 00043 Derivative partial (unsigned int) const; 00044 00045 // Does this function have an analytic derivative? 00046 virtual bool hasAnalyticDerivative() const {return true;} 00047 00048 private: 00049 00050 // It is illegal to assign a ConstPlusFunction 00051 const ConstPlusFunction & operator=(const ConstPlusFunction &right); 00052 00053 double _constant; 00054 const AbsFunction *_arg; 00055 }; 00056 } // namespace Genfun 00057 #endif