Re: where is _ATL_SIMPLEMAPENTRY defined?

From:

"Igor Tandetnik" <itandetnik@mvps.org>

Newsgroups:

microsoft.public.vc.language

Date:

Mon, 7 Apr 2008 22:51:46 -0400

Message-ID:

<eSFl9NSmIHA.1208@TK2MSFTNGP03.phx.gbl>

"George" <George@discussions.microsoft.com> wrote in message
news:0D2FCF30-DA94-4862-8D2B-0B45C986CD77@microsoft.com

For this statement,

#define _ATL_SIMPLEMAPENTRY ((ATL::_ATL_CREATORARGFUNC*)1)

I think it means a function pointer of type CREATORARGFUNC is located
address 0x00000001?

It's just a special value that's guaranteed _not_ to be a valid function
pointer. It's never actually called.

I think ((ATL::_ATL_CREATORARGFUNC)1) should be enough, since
_ATL_CREATORARGFUNC itself is defined to function pointer type.

_ATL_CREATORARGFUNC is a function type, not a function pointer type.

typedef HRESULT (WINAPI _ATL_CREATORARGFUNC)(void* pv, REFIID riid,
LPVOID* ppv, DWORD_PTR dw);

Note no star next to _ATL_CREATORARGFUNC.
--
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