ViewVectorBase.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
 
/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
 
#ifndef ATHCONTAINERS_VIEWVECTORBASE_H
#define ATHCONTAINERS_VIEWVECTORBASE_H
 
 
#include "AthContainers/dataVectorAsELV.h"
#include "AthLinks/ElementLinkBase.h"
#include "SGCore/sgkey_t.h"
#include <vector>
#include <cstdint>
 
 
class ViewVectorBaseTest;
 
 
namespace SG {
 

class ViewVectorBase
{
public:
  virtual ~ViewVectorBase() = default;
 

  virtual void toPersistent() = 0;
 

  virtual void toTransient() = 0;
 

  void clearPersistent();
 

  void setClearOnPersistent();
 
 
protected:
  template <class DV>
  void doToPersistent1 (DV& v, const std::true_type&);
 

  template <class DV>
  void doToPersistent1 (DV&, const std::false_type&);
 

  template <class DV>
  void doToPersistent (DV& v);
 

  template <class DV>
  void doToTransient2 (DV& v, const std::true_type&);
 

  template <class DV>
  void doToTransient2 (DV&, const std::false_type&) {}
 

  template <class DV>
  void doToTransient1 (DV& v, const std::true_type&)
  {
    doToTransient2 (v, std::is_same<DV, typename DV::base_data_vector>());
  }
 

  template <class DV>
  void doToTransient1 (DV&, const std::false_type&) {}
 

  template <class DV>
  void doToTransient (DV& v)
  {
#ifdef XAOD_STANDALONE
    doToTransient1 (v, std::true_type());
#else
    doToTransient1 (v, typename ClassID_traits<DV>::has_classID_tag());
#endif
  }
 
 
private:
  // For unit testing.
  friend class ::ViewVectorBaseTest;

  std::vector<sgkey_t> m_persKey;
  std::vector<unsigned int> m_persIndex;

  bool m_clearOnPersistent = false;
};
 
 
} // namespace SG
 
 
#include "AthContainers/ViewVectorBase.icc"
 
 
#endif // not ATHCONTAINERS_VIEWVECTORBASE_H