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 "TVirtualManager.h"
 
// ROOT include(s):
#include <ROOT/RNTupleReader.hxx>
#include <ROOT/RNTupleView.hxx>
 
// Make the RNTuple types available in the ROOT namespace
// with all versions of ROOT.
#if ROOT_VERSION_CODE < ROOT_VERSION(6, 35, 1)
namespace ROOT {
using Experimental::RNTupleReader;
using Experimental::RNTupleView;
}  // namespace ROOT
#endif  // ROOT_VERSION_CODE < ROOT_VERSION(6, 36, 0)
 
namespace xAOD {
 
   // Forward declaration(s):
   class THolder;
 
   namespace Experimental {
 
   class RObjectManager : public xAOD::TVirtualManager {
 
   public:
      RObjectManager( ROOT::RNTupleView<void> field, ::Long64_t& entry, THolder* holder = 0, ::Bool_t renewOnRead = kFALSE );
 
      RObjectManager( const RObjectManager& parent ) = delete;
      ~RObjectManager();
 
      RObjectManager& operator=( const RObjectManager& parent ) = delete;
 
      const std::string& fieldName() const;
 
      const THolder* holder() const;
      THolder* holder();
 
      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<::Long64_t> m_entryToLoad;
      ::Long64_t m_entry;
      ::Bool_t   m_isSet;
      ::Bool_t   m_renewOnRead;
 
   }; // class RObjectManager
 
   } // namespace Experimental
 
} // namespace xAOD
 
#endif // XAODROOTACCESS_TOOLS_ROBJECTMANAGER_H