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| From | Keith Thompson <Keith.S.Thompson+u@gmail.com> |
|---|---|
| Newsgroups | comp.std.c |
| Subject | Re: Add @ to basic character set? |
| Date | 2020-12-06 15:49 -0800 |
| Organization | None to speak of |
| Message-ID | <87czzmfqb3.fsf@nosuchdomain.example.com> (permalink) |
| References | (3 earlier) <rqiik6$58p$1@dont-email.me> <rqijtd$dbr$1@dont-email.me> <ud5zH.388173$gR8.7685@fx45.iad> <87lfeafv1r.fsf@nosuchdomain.example.com> <D9dzH.185712$ql4.125078@fx39.iad> |
Richard Damon <Richard@Damon-Family.org> writes:
> On 12/6/20 5:07 PM, Keith Thompson wrote:
>> Richard Damon <Richard@Damon-Family.org> writes:
>> [...]
>>> The issue with making them part of the basic character set is that it
>>> makes any system that can't do this, because it uses a strange character
>>> set, non-conforming. Since systems ARE allowed to add any characters
>>> they want to the source or execution character set, those that currently
>>> support them can do so. Forcing them to be included drops some system
>>> from being able to have a conforming implementation, and the committee
>>> has traditionally avoided gratuitously making systems non-conforming.
>>
>> (Context: The ASCII characters '@', '$', and '`'.)
>>
>> I'd be interested in seeing an implementation for which this would
>> be relevant. Such an implementation (a) would be unable to (easily)
>> represent those three character in source code and/or during
>> execution *and* (b) would otherwise conform to the hypothetical
>> edition of the C standard that would add them to the basic character
>> set if it were not for this change.
>
> As was mentioned, all that you need is to want to support ISO/IEC 646
> for a naional character set that doesn't define code point 64 as @
>
> This includes Canadian, French, German, Irish, and a number of others.
>
> See https://en.wikipedia.org/wiki/ISO/IEC_646 for a chart of these.
What C implementations support those character sets (and are likely to
attempt to conform to a future C standard that adds '@' to the basic
character set)?
The following characters are also not part of the invariant character
set: # [ \ ] ^ { | } ~ (We have trigraphs for those. I *do not*
suggest adding trigraphs for @ $ `.)
C++ has already dropped trigraphs because support for the old 7-bit
national character sets was considered unimportant. (But C++17
did not add @ $ ` to its basic character set.) I understand that
C has different issues than C++, but in my opinion adding @ $
` to C's basic character set would cause no actual harm.
--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Philips Healthcare
void Void(void) { Void(); } /* The recursive call of the void */
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Add @ to basic character set? Philipp Klaus Krause <pkk@spth.de> - 2020-12-05 08:58 +0100
Re: Add @ to basic character set? James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-12-05 10:53 -0500
Re: Add @ to basic character set? David Brown <david.brown@hesbynett.no> - 2020-12-05 17:15 +0100
Re: Add @ to basic character set? Philipp Klaus Krause <pkk@spth.de> - 2020-12-05 20:55 +0100
Re: Add @ to basic character set? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-12-05 14:17 -0800
Re: Add @ to basic character set? Francis Glassborow <francis.glassborow@btinternet.com> - 2020-12-06 12:25 +0000
Re: Add @ to basic character set? David Brown <david.brown@hesbynett.no> - 2020-12-06 13:47 +0100
Re: Add @ to basic character set? Richard Damon <Richard@Damon-Family.org> - 2020-12-06 08:42 -0500
Re: Add @ to basic character set? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-12-06 14:07 -0800
Re: Add @ to basic character set? Richard Damon <Richard@Damon-Family.org> - 2020-12-06 17:44 -0500
Re: Add @ to basic character set? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-12-06 15:49 -0800
Re: Add @ to basic character set? Philipp Klaus Krause <pkk@spth.de> - 2020-12-07 09:31 +0100
Re: Add @ to basic character set? Richard Damon <Richard@Damon-Family.org> - 2020-12-07 07:24 -0500
Re: Add @ to basic character set? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-12-07 12:16 -0800
Re: Add @ to basic character set? Richard Damon <Richard@Damon-Family.org> - 2020-12-07 15:51 -0500
Re: Add @ to basic character set? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-12-07 13:10 -0800
Re: Add @ to basic character set? Andreas Schwab <schwab@linux-m68k.org> - 2020-12-07 23:52 +0100
Re: Add @ to basic character set? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-12-07 15:27 -0800
Re: Add @ to basic character set? Richard Damon <Richard@Damon-Family.org> - 2020-12-07 18:54 -0500
Re: Add @ to basic character set? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-12-07 16:10 -0800
Re: Add @ to basic character set? Richard Damon <Richard@Damon-Family.org> - 2020-12-07 18:31 -0500
Re: Add @ to basic character set? Andreas Schwab <schwab@linux-m68k.org> - 2020-12-07 23:08 +0100
Re: Add @ to basic character set? Philipp Klaus Krause <pkk@spth.de> - 2020-12-07 09:30 +0100
Re: Add @ to basic character set? Philipp Klaus Krause <pkk@spth.de> - 2020-12-07 09:17 +0100
Re: Add @ to basic character set? Thomas David Rivers <rivers@dignus.com> - 2020-12-06 16:11 -0500
Re: Add @ to basic character set? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-12-07 12:19 -0800
Re: Add @ to basic character set? Thomas David Rivers <rivers@dignus.com> - 2020-12-07 17:02 -0500
Re: Add @ to basic character set? Philipp Klaus Krause <pkk@spth.de> - 2021-03-11 22:50 +0100
Re: Add @ to basic character set? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-03-11 15:40 -0800
Re: Add @ to basic character set? Philipp Klaus Krause <pkk@spth.de> - 2021-03-12 15:25 +0100
Re: Add @ to basic character set? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2021-07-10 08:46 -0700
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