Units.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
 
/*
  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
*/

 
 
#ifndef ATHENAKERNEL_UNITS_H
#define ATHENAKERNEL_UNITS_H
 
 
#include "GaudiKernel/SystemOfUnits.h"
#include "GaudiKernel/PhysicalConstants.h"
 
 
namespace Athena {
namespace Units {
 

template <int TAG> class Unit {};
template <int TAG>
constexpr double operator/ (double x, const Unit<TAG> u)
{
  constexpr double recip = 1. / static_cast<double>(u);
  return x * recip;
}
template <int TAG>
constexpr float operator/ (float x, const Unit<TAG> u)
{
  constexpr float recip = 1. / static_cast<float>(u);
  return x * recip;
}
 
 
// Include a selection of units from SystemOfUnits.h
#define UNIT(NAME)                                                      \
template <> class Unit<__LINE__>                                        \
{                                                                       \
public:                                                                 \
  constexpr operator double() const { return Gaudi::Units::NAME; }      \
};                                                                      \
constexpr static const Unit<__LINE__> NAME
 
UNIT (millimeter);
UNIT (millimeter2);
UNIT (millimeter3);
UNIT (centimeter);
UNIT (centimeter2);
UNIT (centimeter3);
UNIT (meter);
UNIT (meter2);
UNIT (meter3);
UNIT (micrometer);
UNIT (um);
UNIT (mm);
UNIT (mm2);
UNIT (mm3);
UNIT (cm);
UNIT (cm2);
UNIT (cm3);
UNIT (radian);
UNIT (degree);
UNIT (rad);
UNIT (deg);
UNIT (picosecond);
UNIT (nanosecond);
UNIT (microsecond);
UNIT (millisecond);
UNIT (second);
UNIT (ns);
UNIT (s);
UNIT (ms);
UNIT (keV);
UNIT (MeV);
UNIT (GeV);
UNIT (TeV);
UNIT (gram);
UNIT (g);
UNIT (mole);
UNIT (c_light);
#undef UNIT
 
 
} // namespace Units
} // namespace Athena
 
 
#endif // not ATHENAKERNEL_ATLASUNITS_H