TVirtualEvent.h

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// Dear emacs, this is -*- c++ -*-
//
// Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
//
#ifndef XAODROOTACCESSINTERFACES_TVIRTUALEVENT_H
#define XAODROOTACCESSINTERFACES_TVIRTUALEVENT_H
 
// Project include(s).
#include "SGCore/sgkey_t.h"
 
// Forward declaration(s):
namespace std {
   class type_info;
}
 
namespace xAOD {

   class TVirtualEvent {
 
   public:
      using sgkey_t = SG::sgkey_t;

      virtual ~TVirtualEvent() = default;

      static constexpr sgkey_t DEFAULT_KEY = ~static_cast<sgkey_t>(0);
      static constexpr sgkey_t KEY_MASK = DEFAULT_KEY >> 2;

      template< typename T >
      bool retrieve( const T*& obj, sgkey_t key = DEFAULT_KEY,
                     bool silent = false );
      template< typename T >
      bool retrieve( const T*& obj, const std::string& key,
                     bool silent = false );

      virtual sgkey_t getHash( const std::string& key ) const = 0;
      virtual sgkey_t getKey( const void* obj ) const = 0;
      virtual const std::string& getName( const void* obj ) const = 0;
      virtual const std::string& getName( sgkey_t hash ) const = 0;
 
   protected:
      virtual void* getOutputObject( sgkey_t key,
                                     const std::type_info& ti ) = 0;
      virtual const void* getInputObject( sgkey_t key,
                                          const std::type_info& ti,
                                          bool silent = false ) = 0;
 
   }; // class TVirtualEvent
 
} // namespace xAOD
 
// Include the template implementation:
#include "TVirtualEvent.icc"
 
#endif // XAODROOTACCESSINTERFACES_TVIRTUALEVENT_H