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//--------------------------------------------------------------------------
// File and Version Information:
//      $Id: DifArray.h,v 1.4 2010/03/25 09:55:57 zhangy Exp $
//
// Description:
//      Class Header for |DifArray|
//      What i do ?
//
// 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
//      Zhang Yao(zhangyao@ihep.ac.cn)  Upgrade to CLHEP2.0.4.5 2010-03-25
//
//------------------------------------------------------------------------

#ifndef DIFARRAY_H
#define DIFARRAY_H

#include "CLHEP/Matrix/Matrix.h"
#include "CLHEP/Matrix/Vector.h"
#include <assert.h>
#include <stdlib.h>

using namespace CLHEP;

class DifNumber; 

class DifArray {

public:
  DifArray(int n,int npar=0);   // make an array of n elements
  DifArray                      // copy from a vector
  (const HepVector& v,int npar=0);
  DifArray(const DifArray& a);  // make a copy
  ~DifArray();                  // destroy array
  DifNumber& operator[](int i); // subscripting (elem=i)
  DifNumber& operator()(int i); // subscripting (elem=i-1)
  DifNumber fetch(int i)const;  // fetch elem=i
  int nElem()const {return _nElem;} // number of elements
  DifArray& operator=(const DifArray&); // assignment operator
  HepMatrix jacobian()const;    // return matrix of derivatives
  void zero(int npar=0);        // zero this array
  void print()const;    // print this array

private:

  //data
  int _nElem;                   // number of elements
  DifNumber* _pointer;          // pointer to data

  //private functions
  void copy(const DifArray& a); // copy a to *this
  void copy(const HepVector& a,int npar=0); //copy a clhep vector
  

};

#endif

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