IdentContIndexingPolicy.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
#ifndef ATHLINKS_TOOLS_IDENTCONTINDEXINGPOLICY_H
#define ATHLINKS_TOOLS_IDENTCONTINDEXINGPOLICY_H
 
#include "AthLinks/tools/IdentContIndex.h"
#include "AthLinks/exceptions.h"
#include "AthenaKernel/tools/type_tools.h"
#include <concepts>
#include <cassert>
#include <stdexcept>
 
 
namespace SG {
 
 
template <class CONT>
class IdentContIndexingPolicy
{
private:
  typedef typename CONT::IDENTIFIABLE    coll_type;
  typedef typename coll_type::value_type obj_type;
 
 
public:
  typedef typename type_tools::Copy<obj_type>::type            ElementType;
  typedef typename type_tools::Copy<obj_type>::const_reference ElementConstReference;
  typedef typename type_tools::Copy<obj_type>::const_pointer   ElementConstPointer; 
 
  typedef unsigned int                   index_type;
    
  typedef index_type stored_index_type;
 
 
  static bool isValid (stored_index_type index);
 
 
  static index_type storedToExternal (stored_index_type index);
 
 
  static void reset (stored_index_type& index);
    
 
  static
  ElementType lookup (index_type index, const CONT& data);
 
 
  static void
  reverseLookup(const CONT& data, 
                ElementConstReference element,
                index_type& index);
};
 
 
} // namespace SG
 
 
#include "AthLinks/tools/IdentContIndexingPolicy.icc"
 
 
#endif // ATHLINKS_TOOLS_IDENTCONTINDEXINGPOLICY_H