DifArray.h

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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([email protected])  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