LinearPacker.h

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/*
  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef TRTCONDITIONSDATA_LINEARPACKER_H
#define TRTCONDITIONSDATA_LINEARPACKER_H
 
#include <limits>
 
namespace TRTCond
{
  template <class UnpackedType, class PackedType>
  class LinearPacker
  {
  public:
 
    LinearPacker() : m_xmin(1),m_xmax(0) {}
 
    LinearPacker(UnpackedType xmin, UnpackedType xmax) : m_xmin(xmin), m_xmax(xmax) {}
 
    UnpackedType unpack(PackedType val ) const { return m_xmin + (val-valmin())  * dx() ; }
 
    PackedType pack(UnpackedType x )const {
      return x>=m_xmax ? valmax() : (x<=m_xmin ? valmin() : valmin() + PackedType((x - m_xmin) /dx() + 0.5) ) ;
    }
    
  private:
 
    PackedType valmax() const { return std::numeric_limits<PackedType>::max() ; }
 
    PackedType valmin() const { return std::numeric_limits<PackedType>::min() ; }
 
    UnpackedType dx() const { return (m_xmax - m_xmin)/(UnpackedType(valmax()-valmin())+1) ; }
  private:
    UnpackedType m_xmin ; 
    UnpackedType m_xmax ; 
  } ;
  
}
 
#endif