Unit.h

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
 
#pragma once
 
#include <string>
#include <map>
 
namespace Belle2 {
  class Unit {
 
  public:
 
    static const double cm;           
    static const double ns;           
    static const double GHz;          
    static const double rad;          
    static const double GeV;          
    static const double K;            
    static const double e;            
    static const double g_cm3;        
    // length units
    static const double km;           
    static const double m;            
    static const double mm;           
    static const double um;           
    static const double nm;           
    static const double pm;           
    static const double fm;           
    // area units
    static const double m2;           
    static const double cm2;          
    static const double mm2;          
    static const double b;            
    static const double mb;           
    static const double ub;           
    static const double nb;           
    static const double pb;           
    static const double fb;           
    static const double ab;           
    // volume units
    static const double m3;           
    static const double cm3;          
    static const double mm3;          
    // time units
    static const double s;            
    static const double ms;           
    static const double us;           
    static const double ps;           
    static const double fs;           
    // frequency units
    static const double Hz;           
    static const double kHz;          
    static const double MHz;          
    static const double mHz;          
    // angle units
    static const double mrad;         
    static const double deg;          
    // energy units
    static const double eV;           
    static const double keV;          
    static const double MeV;          
    static const double TeV;          
    static const double J;            
    static const double V;            
    // magnetic field units
    static const double T;            
    static const double mT;           
    static const double Gauss;        
    static const double kGauss;       
    // charge units
    static const double C;            
    static const double fC;           
    // density units
    static const double mg_cm3;       
    static const double kg_cm3;       
    static const double g_mm3;        
    static const double mg_mm3;       
    static const double kg_mm3;       
    static double convertValue(double value, const std::string& unitString);
 
    static double convertValueToUnit(double value, const std::string& unitString);
 
  protected:
    static double registerConversion(const std::string& name, double value);
    static std::map<std::string, double> s_conversionFactors;
 
  private:
    Unit() = delete;
    Unit(const Unit&) = delete;
    Unit& operator=(const Unit&) = delete;
    ~Unit() = delete;
  };
 
}