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Groups > comp.lang.c++ > #67937
| From | Tim Rentsch <tr.17687@z991.linuxsc.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: How to get standard paths?!? |
| Date | 2019-08-25 05:35 -0700 |
| Organization | A noiseless patient Spider |
| Message-ID | <868srh1kyz.fsf@mailhub.linuxsc.com> (permalink) |
| References | (16 earlier) <qjbav1$uap$1@news.albasani.net> <7cb6F.89442$GfB1.45648@fx36.am4> <grtk07Fcnh9U1@mid.individual.net> <r%h6F.22023$Jh2.12734@fx39.am4> <gru0b4Ff9p7U1@mid.individual.net> |
Bo Persson <bo@bo-persson.se> writes:
> On 2019-08-18 at 21:51, Bart wrote:
>
>> On 18/08/2019 19:33, Bo Persson wrote:
>>
>>> On 2019-08-18 at 14:07, Bart wrote:
>>>
>>>> On 18/08/2019 11:57, Bonita Montero wrote:
>>>>
>>>>>>> Unicode is defined to have a maximum of 21 bit codepoints.
>>>>>>
>>>>>> Yes. And how to you fit those 21 bits into a 16-bit wchar_t ?
>>>>>
>>>>> That's not necessary if you use UTF-16.
>>>>
>>>> Show me how to make use of UTF-16 here, because it doesn't seem to
>>>> work on Windows:
>>>>
>>>> #include <wchar_t>
>>>>
>>>> wchar_t c;
>>>> c = 1000000; // character code 1000000
>>>>
>>>> printf("c = %d 0x%X", c, c);
>>>>
>>>> Displays:
>>>>
>>>> c = 16960 0x4240
>>>>
>>>> Not this:
>>>>
>>>> c = 1000000 0xF4240
>>>
>>> So we can only guess that this character code is not part of the
>>> "supported locale" used in your program.
>>>
>>> Nowhere does the language standard require C++ to support all
>>> available OS locales. It could be a very small subset.
>>
>> A small subset where none of the locale's alphabets has character
>> codes above 65535.
>
> Yes, that would conform to the C++ standard.
>
>> Anyway, the locale need have nothing to do with the ability to be
>> able to read, write or process arbitrary Unicode characters and
>> strings.
>
> Neither does wchar_t. The C++ standard only says:
>
> "The values of type wchar_t can represent distinct codes for all
> members of the largest extended character set specified among the
> supported locales."
>
> And then it is up to the implementation to define what locales that
> could be.
>
>> Otherwise countries such as the UK and US could get by with just ASCII.
>>
>> But if they are going beyond a 7-bit character, then why not beyond
>> 16-bit too? Actually, the first few alphabets beyond codepoint 65535
>> appear to be ancient scripts with no meaningful locale anyway.
>
> VC++ also offers non-standard use of UTF-16, should you need to use
> those characters anyway. But that is an extension, and not standard
> C++.
>
> This is kind of similar to some compilers allowing the use of integer
> types larger that intmax_t, by calling __int128 an extension (and not
> "an extended integer type").
I see you are giving the same wrong arguments that you gave three
years ago.
C and C++ implementations must support the locale-specific native
environment (assuming a hosted implementation in C). They don't
get to choose what that is; they are required to document it,
but the standards do not AFAICT give any freedom to choose it. If
the native environment in MS Windows has more than 65K characters
then the implementation is non-conforming.
Besides that, regardless of what locale names are documented as
being "supported", any locale whose name is accepted by the
setlocale() function (ie, return value is not null) must have the
property that all of its characters have distinct values that fit
in a single wchar_t object. Any violation of this property means
the implementation is not conforming. Note that the setlocale()
calls all fall within the bounds of Standard-specified behavior.
There is no wiggle room available to try to sweep these under the
rug as "extensions".
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How to get standard paths?!? Szyk Cech <szykcech@spoko.pl> - 2019-08-17 13:58 +0200
Re: How to get standard paths?!? "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2019-08-17 14:02 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-17 14:05 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-17 15:11 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-17 15:59 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-17 16:20 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-17 16:28 +0200
Re: How to get standard paths?!? Ralf Goertz <me@myprovider.invalid> - 2019-08-17 16:37 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-17 16:54 +0200
Re: How to get standard paths?!? Paavo Helde <myfirstname@osa.pri.ee> - 2019-08-17 18:37 +0300
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-17 17:54 +0200
Re: How to get standard paths?!? Paavo Helde <myfirstname@osa.pri.ee> - 2019-08-17 19:55 +0300
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-17 19:15 +0200
Re: How to get standard paths?!? Paavo Helde <myfirstname@osa.pri.ee> - 2019-08-17 20:39 +0300
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-17 19:44 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-17 20:10 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 08:58 +0200
Re: How to get standard paths?!? Bart <bc@freeuk.com> - 2019-08-18 10:16 +0100
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 11:27 +0200
Re: How to get standard paths?!? Bo Persson <bo@bo-persson.se> - 2019-08-17 21:07 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-17 21:41 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-17 17:40 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-17 17:52 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-17 18:00 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-17 18:01 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-17 18:26 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-17 20:20 +0200
Re: How to get standard paths?!? Keith Thompson <kst-u@mib.org> - 2019-08-17 16:33 -0700
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-18 11:34 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 08:48 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-18 11:34 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 12:57 +0200
Re: How to get standard paths?!? Bart <bc@freeuk.com> - 2019-08-18 13:07 +0100
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 15:49 +0200
Re: How to get standard paths?!? Bo Persson <bo@bo-persson.se> - 2019-08-18 20:33 +0200
Re: How to get standard paths?!? Bart <bc@freeuk.com> - 2019-08-18 20:51 +0100
Re: How to get standard paths?!? Bo Persson <bo@bo-persson.se> - 2019-08-19 00:04 +0200
Re: How to get standard paths?!? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-08-25 05:35 -0700
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-25 15:02 +0200
Re: How to get standard paths?!? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-08-25 06:38 -0700
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-25 15:46 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-25 15:54 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-19 08:52 +0200
Re: How to get standard paths?!? "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2019-08-19 09:32 +0200
Re: How to get standard paths?!? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-08-22 12:37 -0700
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-19 10:26 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-17 18:00 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-17 18:06 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-17 20:24 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 08:49 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-18 11:46 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 12:59 +0200
Re: How to get standard paths?!? scott@slp53.sl.home (Scott Lurndal) - 2019-08-18 15:40 +0000
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 17:44 +0200
Re: How to get standard paths?!? scott@slp53.sl.home (Scott Lurndal) - 2019-08-18 15:38 +0000
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 17:46 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-17 17:56 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-17 18:05 +0200
Re: How to get standard paths?!? Hergen Lehmann <hlehmann.expires.5-11@snafu.de> - 2019-08-17 19:47 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-17 20:46 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 08:54 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-18 12:07 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 13:05 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-18 14:48 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 15:51 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-18 16:43 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 17:02 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-17 20:41 +0200
Re: How to get standard paths?!? Keith Thompson <kst-u@mib.org> - 2019-08-17 16:46 -0700
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-18 12:22 +0200
Re: How to get standard paths?!? Robert Wessel <robertwessel2@yahoo.com> - 2019-08-17 22:57 -0500
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 08:57 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-18 12:24 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 13:07 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-18 13:13 +0200
Re: How to get standard paths?!? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-08-17 11:22 -0700
Re: How to get standard paths?!? Bo Persson <bo@bo-persson.se> - 2019-08-17 21:21 +0200
Re: How to get standard paths?!? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-08-17 22:25 -0700
Re: How to get standard paths?!? Robert Wessel <robertwessel2@yahoo.com> - 2019-08-19 01:19 -0500
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-19 08:25 +0200
Re: How to get standard paths?!? Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-17 14:02 +0200
Re: How to get standard paths?!? David Brown <david.brown@hesbynett.no> - 2019-08-17 15:13 +0200
Re: How to get standard paths?!? Sam <sam@email-scan.com> - 2019-08-17 09:21 -0400
Re: How to get standard paths?!? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-08-19 20:57 +0000
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