CLHEP/GenericFunctions/LogGamma.hh
// -*- C++ -*-
// $Id: LogGamma.hh,v 1.2 2001/06/18 13:53:13 evc Exp $
//---------------------Logarithm of Gamma Function--------------------------//
// //
// Class LogGamma //
// Joe Boudreau October 2K //
// //
//--------------------------------------------------------------------------//
#ifndef LogGamma_h
#define LogGamma_h 1
#include "CLHEP/GenericFunctions/AbsFunction.hh"
#include "CLHEP/GenericFunctions/Parameter.hh"
HEP_BEGIN_NAMESPACE(Genfun)
class LogGamma : public AbsFunction {
FUNCTION_OBJECT_DEF(LogGamma)
public:
// Constructor
LogGamma();
// Copy constructor
LogGamma(const LogGamma &right);
// Destructor
virtual ~LogGamma();
// Retreive function value
virtual double operator ()(double argument) const;
virtual double operator ()(const Argument & a) const {return operator() (a[0]);}
// Get the sigma
Parameter & sigma();
private:
// It is illegal to assign an adjustable constant
const LogGamma & operator=(const LogGamma &right);
// Constants used in evaluating the function call:
static const double _coefficient[6];
};
HEP_END_NAMESPACE(Genfun)
#endif
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