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Article View: comp.std.c
Article #4085

Re: Function-prototype scope: Why?

#4085
From: Michael Meissner
Date: Fri, 22 Sep 1995 16:12
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In article <43s7k4$j2v@gatekeeper.atml.co.uk> jrr@atml.co.uk (John Rickard) writes:

| Stan Ryckman (sgr@ae-sun01.alden.com) wrote:
| : All pointers-to-struct must have the same "shape"
| 
| Is that so?  I've often written code that makes that assumption, but I
| can't find any justification for it in the standard.  Can you give
| references?

Because if they didn't, then you couldn't reliably write code that uses:

	struct unknown_in_this_module *ptr

as an opaque pointer.
-- 
Michael Meissner, Cygnus Support (East Coast)
Suite 105, 48 Grove Street, Somerville, MA 02144, USA
meissner@cygnus.com,	617-629-3016 (office),	617-629-3010 (fax)
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Path: arc1-ca.pugleaf.net!cambridge-news.cygnus.com!meissner
From: meissner@cygnus.com (Michael Meissner)
Newsgroups: comp.std.c
Subject: Re: Function-prototype scope: Why?
Date: 22 Sep 1995 16:12:46 GMT
Organization: Cygnus Support
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In-reply-to: jrr@atml.co.uk's message of 21 Sep 1995 17:32:52 GMT