DifExternal.h

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//--------------------------------------------------------------------------
// File and Version Information:
//  $Id: DifExternal.h,v 1.2 2009/12/23 02:59:56 zhangy Exp $
//
// Description:
//  Class Header for |DifExternal|
//      Define some useful constants
//
// Environment:
//  Software developed for the BaBar Detector at the SLAC B-Factory.
//
// Author List:
//  A. Snyder
//
// Copyright Information:
//  Copyright (C) 1996  SLAC
// 
// History:
//  Migration for BESIII MDC
//
//------------------------------------------------------------------------
 
#ifndef DifExternal_H
#define DifExternal_H
 
#include "MdcRecoUtil/DifNumber.h"
#include "MdcRecoUtil/DifVector.h"
#include "MdcRecoUtil/DifPoint.h"
#include "MdcRecoUtil/DifComplex.h"
 
extern const DifNumber one;
extern const DifNumber zero;
 
extern const DifVector xhat;
extern const DifVector yhat;
extern const DifVector zhat;
extern const DifVector nullVec;
 
extern const DifPoint origin;
 
extern const DifComplex I;
 
#endif