Am 21.03.2013 14:23, schrieb Kostas Michalopoulos:
Yes, that is what i mean with "topmost" type: if you look at the
inheritance as a tree, TInterfacedObject is the topmost (or root, if
you think of it as an upside-down tree) of the type hierarchy. In this
code
type
IBlah = interface ... end;
TBlah = class(TInterfacedObject, IBlah) ... end;
TBlah is an IBlah, so i'd expect it to behave like IBlah.
And it behaves like an IBlah, because you can assign a TBlah to every
variable or parameter that expects a IBlah.
The point however is that the compiler only inserts calls to AddRef and
Release (which are provided by the base interface IUnknown/IInterface
and of which every (COM) interface is derived) if the variable you work
with is of an interface type.
Regards,
Sven
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