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00001 // -*- C++ -*- 00002 // $Id: KroneckerDelta.hh,v 1.1 2007/01/21 20:54:33 boudreau Exp $ 00003 //---------------------Rectangular------------------------------------------// 00004 // // 00005 // Class KroneckerDelta by Joe Boudreau // 00006 // // 00007 //--------------------------------------------------------------------------// 00008 #ifndef KroneckerDelta_h 00009 #define KroneckerDelta_h 1 00010 #include "CLHEP/GenericFunctions/AbsFunction.hh" 00011 #include "CLHEP/GenericFunctions/Parameter.hh" 00012 namespace Genfun { 00013 00018 class KroneckerDelta : public AbsFunction { 00019 00020 FUNCTION_OBJECT_DEF(KroneckerDelta) 00021 00022 public: 00023 00024 // Constructor 00025 KroneckerDelta(); 00026 00027 // Copy constructor 00028 KroneckerDelta(const KroneckerDelta &right); 00029 00030 // Destructor 00031 virtual ~KroneckerDelta(); 00032 00033 // Retreive function value 00034 virtual double operator ()(double argument) const; 00035 virtual double operator ()(const Argument & a) const {return operator() (a[0]);} 00036 00037 // Derivative. 00038 Derivative partial (unsigned int) const; 00039 00040 // Does this function have an analytic derivative? 00041 virtual bool hasAnalyticDerivative() const {return true;} 00042 00043 private: 00044 00045 // It is illegal to assign an adjustable constant 00046 const KroneckerDelta & operator=(const KroneckerDelta &right); 00047 00048 00049 }; 00050 } // namespace Genfun 00051 #endif