[Lazarus] IUnknown and reference counting

[Sven Barth]

Am 20.03.2013 15:35, schrieb Xiangrong Fang:
> OK, What confused me is the description found in FPC manual saying:
>
> TInterfacedObject is a descendent of TObject 
> <http://www.freepascal.org/docs-html/rtl/system/tobject.html> which 
> implements the IUnknown 
> <http://www.freepascal.org/docs-html/rtl/system/iunknown.html> 
> interface. It can be used as a base class for all classes which need 
> reference counting.
>
> in another word, reference counting is a feature of TInterfacedObject, 
> or the AfterConstruction/BeforeDestruction methods??  it sounds like 
> non-descedants of TInterfacedObject are not reference counted??
No, the reference counting is a feature of IUnknown (or any descendant 
of it) and is only used if you work with the interface and not the class 
type. You can implement the IUnknown (or IInterface) interface yourself 
as well.

Regards,
Sven
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