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| From | Tobias Blass <tobiasblass@gmx.net> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Struct casting |
| Date | 2011-12-05 22:00 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <jbjet4$dl3$1@dont-email.me> (permalink) |
| References | <jbjeed$c1v$1@speranza.aioe.org> |
On 2011-12-05, Edward Rutherford <edward.p.rutherford79@REMOVETHIS.gmail.com> wrote:
> This was pulled up at a code review. Code was similar to this:
>
> struct foo {
> int bar;
> int baz;
> } f;
>
> int * i = (int *) f;
>
> The only way this could go wrong is if the struct contains padding before
> its first member, but I don't think this would ever happen in practice
> --- maybe on theoretical perverse implementations like the ones you guys
> like to play with :)
>
> Who is right here by the letter of the law?
>
The standard guarantees that there is no padding before the first element, so
this conversion is absolutely valid. It may cause problems when another variable
is placed before the 'bar',though, and I wouldn't bet that the person that adds
the new member will change all these assignments.
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Struct casting Edward Rutherford <edward.p.rutherford79@REMOVETHIS.gmail.com> - 2011-12-05 21:52 +0000
Re: Struct casting Harald van Dijk <truedfx@gmail.com> - 2011-12-05 13:58 -0800
Re: Struct casting Tobias Blass <tobiasblass@gmx.net> - 2011-12-05 22:00 +0000
Re: Struct casting Ian Collins <ian-news@hotmail.com> - 2011-12-06 11:10 +1300
Re: Struct casting tom st denis <tom@iahu.ca> - 2011-12-05 14:06 -0800
Re: Struct casting Ian Collins <ian-news@hotmail.com> - 2011-12-06 11:11 +1300
Re: Struct casting James Kuyper <jameskuyper@verizon.net> - 2011-12-05 17:13 -0500
Re: Struct casting Robert Wessel <robertwessel2@yahoo.com> - 2011-12-05 16:10 -0600
Re: Struct casting Ian Collins <ian-news@hotmail.com> - 2011-12-06 11:13 +1300
Re: Struct casting James Kuyper <jameskuyper@verizon.net> - 2011-12-05 17:15 -0500
Re: Struct casting Keith Thompson <kst-u@mib.org> - 2011-12-05 14:16 -0800
Re: Struct casting Lauri Alanko <la@iki.fi> - 2011-12-06 18:00 +0000
Re: Struct casting blp@cs.stanford.edu (Ben Pfaff) - 2011-12-05 14:19 -0800
Re: Struct casting jacob navia <jacob@spamsink.net> - 2011-12-06 08:29 +0100
Re: Struct casting Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-12-06 00:15 -0800
Re: Struct casting Ian Collins <ian-news@hotmail.com> - 2011-12-06 22:30 +1300
Re: Struct casting jgk@panix.com (Joe keane) - 2011-12-08 21:08 +0000
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