CLHEP/GenericFunctions/Sqrt.hh

0001 // -*- C++ -*-
0002 // $Id: Sqrt.hh,v 1.2 2003/09/06 14:04:13 boudreau Exp $
0003 //----------------------Sqrt--------- --------------------------------------//
0004 //                                                                          //
0005 //  Class Sqrt                                                              //
0006 //  Joe Boudreau, Petar Maksimovic, Nov. 1999                               //
0007 //                                                                          //
0008 //  Sqrt is a function that returns the square root of the argument         //
0009 //--------------------------------------------------------------------------//
0010 #ifndef Sqrt_h
0011 #define Sqrt_h 1
0012 #include "CLHEP/GenericFunctions/AbsFunction.hh"
0013 namespace Genfun {
0014
0015   /**
0016    * @author
0017    * @ingroup genfun
0018    */
0019   class Sqrt : public AbsFunction  {
0020
0021     FUNCTION_OBJECT_DEF(Sqrt)
0022
0023       public:
0024
0025     // Constructor
0026     Sqrt();
0027
0028     // Copy constructor
0029     Sqrt(const Sqrt &right);
0030
0031     // Destructor
0032     virtual ~Sqrt();
0033
0034     // Retrieve function value
0035     virtual double operator ()(double argument) const override;
0036     virtual double operator ()(const Argument & a) const override {return operator() (a[0]);}
0037
0038     // Derivative.
0039     Derivative partial (unsigned int) const override;
0040
0041     // Does this function have an analytic derivative?
0042     virtual bool hasAnalyticDerivative() const override {return true;}
0043
0044   private:
0045
0046     // It is illegal to assign a fixed constant
0047     const Sqrt & operator=(const Sqrt &right);
0048
0049   };
0050 } // namespace Genfun
0051 #endif
0052
0053