RDataSourceEvent.h

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// Dear emacs, this is -*- c++ -*-
//
// Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
//
#ifndef XAODDATASOURCE_RDATASOURCEEVENT_H
#define XAODDATASOURCE_RDATASOURCEEVENT_H
 
// xAOD include(s).
#include "xAODRootAccess/TEvent.h"
 
// ROOT include(s).
#include <ROOT/RStringView.hxx>
 
// System include(s).
#include <string>
#include <vector>
#include <utility>
#include <typeinfo>
#include <unordered_map>
 
namespace xAOD {

   class RDataSourceEvent final : public TEvent {
 
   public:
      // Inherit the base class's constructor(s).
      using TEvent::TEvent;

      std::vector< std::pair< std::string, std::string > > columnAndTypeNames();
      void* columnReader( std::string_view columnName,
                          const std::type_info& typeInfo );
      void updateObjectsForEntry( Long64_t entry );
 
   private:
      typedef std::pair< std::string, const std::type_info* > Key_t;

      class key_hash {
      public:
         std::size_t operator()( const Key_t& key ) const;
      };

      std::unordered_map< Key_t, const void*, key_hash > m_objects;
 
   }; // class RDataSourceEvent
 
} // namespace xAOD
 
#endif // XAODDATASOURCE_RDATASOURCEEVENT_H