THolderCache.h

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// Dear emacs, this is -*- c++ -*-
//
// Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
//
#ifndef XAODROOTACCESS_THOLDERCACHE_H
#define XAODROOTACCESS_THOLDERCACHE_H
 
// System include(s):
#include <map>
#include <shared_mutex>
#include <utility>
 
// Forward declaration(s):
namespace std {
   class type_info;
}
class TClass;
 
namespace xAOD {
 
   namespace Internal {
 
      class THolderCache {
 
      public:
         static THolderCache& instance();
 
         std::pair< bool, ::TClass* >
         getClass( const std::type_info& ti ) const;
         void addClass( const std::type_info& ti, ::TClass* cl );
 
         int getRef( void* ptr ) const;
         int incRef( void* ptr );
         int decRef( void* ptr );
 
      private:
         THolderCache();
         THolderCache( const THolderCache& ) = delete;
 
         std::map< const std::type_info*, TClass* > m_typeMap;
         std::map< void*, int > m_refMap;
 
         mutable std::shared_timed_mutex m_typeMapMutex;
         mutable std::shared_timed_mutex m_refMapMutex;
 
      }; // class THolderCache
 
   } // namespace Internal
 
} // namespace xAOD
 
#endif // XAODROOTACCESS_THOLDERCACHE_H