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TComponentNexus

Defines an object that can listen for free component notifications for a non-component object. This class allows non-TComponent descendants to use the automatic memory management of TComponent

TRefCount

The TRefCount class implements the IUnknown interface for an Owner object. The TRefCount class makes it easy to quickly make a class to implement the IUnknown interface by using delegation instead of descending from TInterfacedObject, TComponent or similar class. The Owner object just needs to declare a property of this type with the implements keyword and allocate (and free) the memory for the TRefCount class. For example,

Delphi

property RefCount: TRefCount read FRefCount implements IUnknown;