HTAbsValVector.h

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//--------------------------------------------------------------------------
// File and Version Information:
//  $Id: HTAbsValVector.h,v 1.2 2009/12/23 02:59:56 zhangy Exp $
//
// Description:
//  This is an abstract class specifing the interface which any 
//  vector-like class must provide if it needs to be used as the parameter
//  to ntuple's column() method taking arrays.
//
// Environment:
//  Software developed for the BaBar Detector at the SLAC B-Factory.
//
// Author List:
//  A.Salnikov
//
// Copyright Information:
//  Copyright (C) 1997  Saclay
// 
// History:
//  Migration for BESIII MDC
//
//------------------------------------------------------------------------
 
#ifndef HTAbsValVector_H
#define HTAbsValVector_H
 
#include <sys/types.h>
#include <stddef.h>
 
//      ---------------------
//      -- Class Interface --
//      ---------------------
 
template<class T> 
class HTAbsValVector {
  
public:
  virtual ~HTAbsValVector() {}
 
  // operators
  virtual const T& operator()(size_t i) const = 0;
  virtual T& operator()(size_t i) = 0;
  virtual const T& operator[](size_t i) const = 0;
  virtual T& operator[](size_t i) = 0;
 
  // methods
  virtual size_t length() const = 0;
 
};
 
#endif  // TEMPLATE_H