THolder.h

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// Dear emacs, this is -*- c++ -*-
//
// Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
//
#ifndef XAODROOTACCESS_TOOLS_THOLDER_H
#define XAODROOTACCESS_TOOLS_THOLDER_H
 
// STL include(s):
#include <map>
 
// ROOT include(s):
#include <Rtypes.h>
 
// Forward declaration(s):
namespace std {
   class type_info;
}
class TClass;
 
namespace xAOD {

   class THolder {
 
   public:
      THolder();
      THolder( void* object, ::TClass* type, ::Bool_t owner = kTRUE );
      THolder( void* object, const std::type_info& type,
               ::Bool_t owner = kTRUE );

      THolder( const void* object, ::TClass* type, ::Bool_t owner = kTRUE );
      THolder( const void* object, const std::type_info& type,
               ::Bool_t owner = kTRUE );

      THolder( const THolder& parent );
      THolder( THolder&& parent );
      virtual ~THolder();

      THolder& operator=( const THolder& rhs );
      THolder& operator=( THolder&& rhs );

      const void* get() const;
      void* get();

      void** getPtr();

      virtual void set( void* obj );

      ::Bool_t isOwner() const;
      void setOwner( ::Bool_t state = kTRUE );

      ::Bool_t isConst() const;
      void setConst();

      virtual void* getAs( const std::type_info& tid,
                           ::Bool_t silent = kFALSE ) const;
      virtual const void* getAsConst( const std::type_info& tid,
                                      ::Bool_t silent = kFALSE ) const;

      const ::TClass* getClass() const;
      ::TClass* getClass();
      const std::type_info* getTypeInfo() const;

      void renew();

      enum TypeKind {
        OTHER,      
        DATAVECTOR, 
        AUXELEMENT  
      }; // enum TypeKind

      TypeKind typeKind() const {
         return m_typeKind;
      }
 
   protected:
      void deleteObject();

      void* getImpl( const std::type_info& tid,
                     ::Bool_t silent = kFALSE ) const;

      void* m_object;
      ::TClass* m_type;
      const std::type_info* m_typeInfo;
      ::Bool_t m_owner;
      TypeKind m_typeKind;
      ::Bool_t m_const;
 
   }; // class THolder
 
} // namespace xAOD
 
#endif // XAODROOTACCESS_TOOLS_THOLDER_H