Reconstruction/MdcPatRec/MdcRecoUtil/include/MdcRecoUtil/ComPackSignedExpFloat.h

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//--------------------------------------------------------------------------
// File and Version Information:
//      $Id: ComPackSignedExpFloat.h,v 1.2 2009/12/23 02:59:56 zhangy Exp $
//
// Description:
//      class ComPackSignedExpFloat; Uses ComPackExpFloat to store the
//      magnitude of a signed quantity, then adds in the sign.
// Environment:
//      Software developed for the BaBar Detector at the SLAC B-Factory.
//
// Author List:
//      Dave Brown         10/12/00
//
// Copyright Information:
//      Copyright (C) 2000 LBNL
//
// History:
//  Migration for BESIII MDC
//
//
//--------------------------------------------------------------------------
 
#ifndef COMPACKSIGNEDEXPFLOAT_HH
#define COMPACKSIGNEDEXPFLOAT_HH
 
#include "MdcRecoUtil/ComPackExpFloat.h"
#include <iostream>
 
class ComPackSignedExpFloat : public ComPackBase<double> {
 
public:
  // See ComPackExpFloat for an explanation.  Note that in this class, the number
  // of bits should include 1 for the sign.  The invert flag specifies that the best
  // resolution should occur at the +-maxval end of the range instead of around 0.
  ComPackSignedExpFloat( unsigned nbits, unsigned maxexponent, double maxval,
                         bool invert = false, bool center = false );
  virtual ~ComPackSignedExpFloat();
  // ComPackBase functions
  virtual StatusCode pack( const double, d_ULong& ) const;
  virtual StatusCode unpack( const d_ULong, double& ) const;
  void               print( std::ostream& s = std::cout ) const;
 
private:
  // This class uses ComPackExpFloat to do the dirty work
  ComPackExpFloat _packer;
  unsigned        _signbit;  // sign bits location
  unsigned        _signmask; // mask for positive
};
 
#endif