Re: error C2898: HRESULT IUnknown::QueryInterface(Q**p) : member function templates cannot be virtual

From:

"Igor Tandetnik" <itandetnik@mvps.org>

Newsgroups:

microsoft.public.vc.atl

Date:

Wed, 22 Aug 2007 07:00:16 -0400

Message-ID:

<uhENhuK5HHA.1208@TK2MSFTNGP03.phx.gbl>

"tom" <kamildobk@poczta.onet.pl> wrote in message
news:1187765614.263467.264160@z24g2000prh.googlegroups.com

So, your advise is to give up with __interface and use just struct,
but why ? Isn't '__interface' supposed to work with COM

I know __interface is used in attributed ATL code. Attributed ATL is
broken beyond repair and should not be used. If you are using it, I
highly recommend you stop now and redo your project as regular
non-attibuted one.

I don't know what __interface does in non-attributed code, and frankly I
don't really care. There doesn't seem to be a point in using it.

I have a bigger problem- on this machine even standard ATL project
doesn't compile ( the same error as above ), but on the second one
everythng goes with no problems. The only difference is in
preprocessed unknwn.h file - it is something like that:

typedef struct IUnknown IUnknown; // ok
typedef __interface IUnknown IUnknown; // this one doesn't compile.

I'm not sure I understand. Did you edit unknwn.h and replaced struct
with __interface? And if so, why on earth would you do such a thing?
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925