/cvmfs/atlas.cern.ch/repo/sw/ASG/AnalysisBase/2.4.31/AthContainers/AthContainers/tools/AuxDataTraits.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
// $Id$
#ifndef ATHCONTAINERS_AUXDATATRAITS_H
#define ATHCONTAINERS_AUXDATATRAITS_H


#include <vector>
#include <cstdlib>


namespace SG {


template <class T>
class AuxDataTraits
{
public:
  typedef T element_type;

  typedef T& reference_type;
  typedef const T& const_reference_type;

  typedef std::vector<T> vector_type;

  typedef typename vector_type::pointer container_pointer_type;
  typedef typename vector_type::const_pointer const_container_pointer_type;

  static reference_type index (void* ptr, size_t ndx)
  {
    return reinterpret_cast<container_pointer_type>(ptr)[ndx];
  }
    
  static const_reference_type index (const void* ptr, size_t ndx)
  {
    return reinterpret_cast<const_container_pointer_type>(ptr)[ndx];
  }
    
};


template <>
class AuxDataTraits<bool>
{
public:
  typedef bool element_type;

  typedef bool& reference_type;
  typedef const bool& const_reference_type;

  typedef std::vector<char> vector_type;

  typedef vector_type::pointer container_pointer_type;
  typedef vector_type::const_pointer const_container_pointer_type;

  static reference_type index (void* ptr, size_t ndx)
  {
    return reinterpret_cast<bool*>(ptr)[ndx];
  }
    
  static const_reference_type index (const void* ptr, size_t ndx)
  {
    return reinterpret_cast<const bool*>(ptr)[ndx];
  }
};


} // namespace SG


#endif // not ATHCONTAINERS_AUXDATATRAITS_H

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