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| Union C++ standard DrDiettrich1@netscape.net (Hans-Peter Diettrich) (2021-11-25) |
| Re: Union C++ standard 480-992-1380@kylheku.com (Kaz Kylheku) (2021-11-26) |
| Re: Union C++ standard gah4@u.washington.edu (gah4) (2021-11-26) |
| Re: Union C++ standard david.brown@hesbynett.no (David Brown) (2021-11-27) |
| Re: Union C++ standard derek@NOSPAM-knosof.co.uk (Derek Jones) (2021-11-28) |
| Re: Union C++ standard david.brown@hesbynett.no (David Brown) (2021-11-28) |
| Re: Union C++ standard derek@NOSPAM-knosof.co.uk (Derek Jones) (2021-11-29) |
| Re: Union C++ standard 480-992-1380@kylheku.com (Kaz Kylheku) (2021-11-29) |
| Re: Union C++ standard david.brown@hesbynett.no (David Brown) (2021-11-29) |
| Re: Union C++ standard Keith.S.Thompson+u@gmail.com (Keith Thompson) (2021-11-29) |
| Re: Union C++ standard derek@NOSPAM-knosof.co.uk (Derek Jones) (2021-11-30) |
| [3 later articles] |
| From: | Derek Jones <derek@NOSPAM-knosof.co.uk> |
| Newsgroups: | comp.compilers |
| Date: | Sun, 28 Nov 2021 12:51:14 +0000 |
| Organization: | Compilers Central |
| References: | 21-11-004 21-11-008 |
| Injection-Info: | gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="13223"; mail-complaints-to="abuse@iecc.com" |
| Keywords: | C, standards |
| Posted-Date: | 28 Nov 2021 12:13:12 EST |
| In-Reply-To: | 21-11-008 |
| Content-Language: | en-US |
David,
> In C, type-punning via unions is allowed (i.e., fully defined behaviour
That is not true. Writing into one member and then reading from
another member is undefined behavior.
There is a special dispensation for what is known as a
common initial sequence:
sentence 1029
http://c0x.shape-of-code.com/6.5.2.3.html
> in the standards), but not in C++ where the language is expected to
> enforce higher-level aspects of the data.
This is a meaningless statement.
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