RObjectManager.h

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// Dear emacs, this is -*- c++ -*-
 
/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef XAODROOTACCESS_TOOLS_ROBJECTMANAGER_H
#define XAODROOTACCESS_TOOLS_ROBJECTMANAGER_H
 
// Local include(s).
#include "xAODRootAccess/tools/IObjectManager.h"
 
// ROOT include(s).
#include <ROOT/RNTupleView.hxx>
 
// System include(s).
#include <functional>
#include <memory>
 
namespace xAOD::Experimental {

class RObjectManager : public Details::IObjectManager {
 
 public:
  RObjectManager(ROOT::RNTupleView<void> field, const ::Long64_t& entry,
                 std::unique_ptr<THolder> holder);
  ~RObjectManager();

  ROOT::RNTupleView<void>& field();
  const ROOT::RNTupleView<void>& field() const;

  virtual ::Int_t getEntry(::Int_t getall = 0) override;

  virtual const void* object() const override;
  virtual void* object() override;
  virtual void setObject(void* obj) override;

  virtual ::Bool_t create() override;
  virtual ::Bool_t isSet() const override;
  virtual void reset() override;
 
 private:
  ROOT::RNTupleView<void> m_field;
  std::unique_ptr<THolder> m_holder;
  std::reference_wrapper<const ::Long64_t> m_entryToLoad;
  ::Long64_t m_entry;
  ::Bool_t m_isSet;
 
};  // class RObjectManager
 
}  // namespace xAOD::Experimental
 
#endif  // XAODROOTACCESS_TOOLS_ROBJECTMANAGER_H