FloatPacker.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
 
/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
// $Id$
#ifndef CXXUTILS_FLOATPACKER_H
#define CXXUTILS_FLOATPACKER_H
 
 
#include <string>
#include <stdint.h>
 
 
 
namespace CxxUtils {
 
 
class FloatPacker
{
public:
  typedef uint32_t Packdest;
 
 
  FloatPacker (int nbits,
               int nmantissa,
               double scale = 1,
               bool is_signed = true,
               bool round = false);
 
 
  Packdest pack (double src, std::string* err = nullptr) const;
 
 
  double unpack (Packdest val, std::string* err = nullptr) const;
 
 
private:
  int m_nmantissa;
 
  double m_scale;
 
  double m_invscale;
 
  bool m_is_signed;
 
  bool m_round;
 
  int m_npack;
 
  Packdest m_npack_ones;
 
  Packdest m_signmask;
 
  int m_nexp;
 
  Packdest m_nexp_ones;
 
  int m_min_exp;
 
  int m_max_exp;
};
 
 
} // namespace CxxUtils
 
 
#endif // not CXXUTILS_FLOATPACKER_H