Re: ref count

From:
"Igor Tandetnik" <itandetnik@mvps.org>
Newsgroups:
microsoft.public.vc.atl
Date:
Sun, 1 Oct 2006 23:35:25 -0400
Message-ID:
<OnY9KPd5GHA.3404@TK2MSFTNGP03.phx.gbl>
"Alexander Nickolov" <agnickolov@mvps.org> wrote in message
news:%23HbAVXb5GHA.3452@TK2MSFTNGP05.phx.gbl

I should mention of course that aliasing is a dangerous
business and should be avoided if reasonable. In my programming
career I've encountered very few cases this would be useful, and
even then safer techniques were available...


There is a common case: an alias is created every time an interface
pointer is passed as an [in] parameter to a function or method. For the
duration of the called function, there are two copies of the pointer but
the reference count is not incremented. Luckily, the rules require that
the function not Release an [in] parameter, so one of the copies quietly
goes away leaving behind a correct ref count.
--
With best wishes,
    Igor Tandetnik

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