src/MEDWrapper/Base/MED_SliceArray.hxx

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//  
//
//  Copyright (C) 2003  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
//  CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS 
// 
//  This library is free software; you can redistribute it and/or 
//  modify it under the terms of the GNU Lesser General Public 
//  License as published by the Free Software Foundation; either 
//  version 2.1 of the License. 
// 
//  This library is distributed in the hope that it will be useful, 
//  but WITHOUT ANY WARRANTY; without even the implied warranty of 
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
//  Lesser General Public License for more details. 
// 
//  You should have received a copy of the GNU Lesser General Public 
//  License along with this library; if not, write to the Free Software 
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA 
// 
// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
//
//
//
//  File   : 
//  Author : 
//  Module : 
//  $Header: /home/server/cvs/MED/MED_SRC/src/MEDWrapper/Base/MED_SliceArray.hxx,v 1.4 2006/06/01 11:21:18 jfa Exp $

#ifndef MED_SliceArray_HeaderFile
#define MED_SliceArray_HeaderFile

#include <valarray>
#include <stdexcept>

//#if defined(_DEBUG_)
#  define MED_TCSLICE_CHECK_RANGE
//#endif

namespace MED
{
  //---------------------------------------------------------------

  template<class TContainer> 
  class TCSlice
  {
    typedef const TContainer* PCContainer;
    PCContainer myCContainer; 
    std::slice mySlice; 
  protected:
    void
    check_id(size_t theId) const
    {
      long int anId = -1;
      if(theId < mySlice.size()){
     anId = mySlice.start() + theId*mySlice.stride();
     if(anId < myCContainer->size())
       return;
      }
      throw std::out_of_range("TCSlice::check_id");
    }

    size_t
    calculate_id(size_t theId) const
    {
      return mySlice.start() + theId*mySlice.stride();
    }
    
    size_t
    get_id(size_t theId) const
    {
#ifdef MED_TCSLICE_CHECK_RANGE
      check_id(theId);
#endif
      return calculate_id(theId);
    }
    
    size_t
    get_id_at(size_t theId) const
    {
      check_id(theId);
      return calculate_id(theId);
    }

  public:
    typedef typename TContainer::value_type value_type;

    TCSlice(const TContainer& theContainer,
         const std::slice& theSlice): 
      myCContainer(&theContainer),
      mySlice(theSlice)
    {}
    
    TCSlice():
      myCContainer(NULL)
    {}

    const value_type& 
    operator[](size_t theId) const
    {
      return (*myCContainer)[get_id(theId)];
    }
    
    const value_type& 
    at(size_t theId) const
    {
      return (*myCContainer)[get_id_at(theId)];
    }
    
    size_t
    size() const
    {
      return mySlice.size();
    }
  };
  

  //---------------------------------------------------------------
  template<class TContainer> 
  class TSlice: public TCSlice<TContainer>
  {
    typedef TContainer* PContainer;
    PContainer myContainer;
    
  public:
    typedef typename TContainer::value_type value_type;
    typedef TCSlice<TContainer> TSupperClass;

    TSlice(TContainer& theContainer,
        const std::slice& theSlice): 
      TSupperClass(theContainer,theSlice),
      myContainer(&theContainer)
    {
    }
    
    TSlice():
      myContainer(NULL)
    {}

    value_type& 
    operator[](size_t theId)
    {
      return (*myContainer)[this->get_id(theId)];
    }

    value_type& 
    at(size_t theId)
    {
      return (*myContainer)[this->get_id_at(theId)];
    }
  };

}

#undef MED_TCSLICE_CHECK_RANGE

#endif

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