Article View: net.lang.c
Article #9561Re: Block Initialization; structs and sizeof
From: Mark Brader
Date: Wed, 15 Oct 1986 19:14
Date: Wed, 15 Oct 1986 19:14
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1903 bytes
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I wrote:
> struct str {int i; char c;} arr[2], sca;
> char buf;
> The most recent ANSI draft that I've examined specifies that if sizeof is
> applied to a structure type, the result is the size of such a structure
> including any trailing padding that would be necessary in an array of
> such structures. ...
> However, the scalar struct sca is not required to have [the] padding.
> ... Thus some compilers may decide to economize
> on storage and place another variable, say buf, [where it would be] ...
According to mail from Larry Rosler, this has been fixed, and the current
draft reads:
# There may also be unnamed padding at the end of a structure,
# as necessary to achieve the appropriate alignment WERE the
# structure to be a member of an array. [Emphasis added]
He has suggested that the definition of sizeof be simplified to remove
the "that would be necessary..." part, which is now redundant.
Mark Brader, utzoo!dciem!msb
"You take the bottle out of the box, take the cotton out of the
bottle ... and if they'd just used the box and not used the bottle
... look at this, all these pills would've fitted into the box and
they'd have had room for 3 times as much cotton!" -- Andy Rooney
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site dciem.UUCP Path: arc1-ca.pugleaf.net!utzoo!dciem!msb From: msb@dciem.UUCP (Mark Brader) Newsgroups: net.lang.c Subject: Re: Block Initialization; structs and sizeof Message-ID: <1980@dciem.UUCP> Date: Wed, 15-Oct-86 15:14:36 EDT Article-I.D.: dciem.1980 Posted: Wed Oct 15 15:14:36 1986 Date-Received: Wed, 15-Oct-86 17:14:09 EDT References: <586@calma.UUCP> <1971@dciem.UUCP> Reply-To: msb@dciem.UUCP (Mark Brader) Organization: NTT Systems Inc., c/o DCIEM, Toronto Lines: 27 Summary: ANSI now *does* require trailing padding on scalar structs