Unicode identifiers

This is a discussion on Unicode identifiers within the C++ Programming forums, part of the General Programming Boards category; To those of you who've tested the 2005 Express beta from microsoft: Does the latest C++ compiler from microsoft support ...

  1. #1
    S Sang-drax's Avatar
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    Unicode identifiers

    To those of you who've tested the 2005 Express beta from microsoft:

    Does the latest C++ compiler from microsoft support unicode characters?

    I.e. will this code compile:
    Code:
    int main()
    {
      int åtta= 8;
    }
    I'm just curious. I cannot remember I've seen any compiler support this.
    Last edited by Sang-drax : Tomorrow at 02:21 AM. Reason: Time travelling

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    Quote Originally Posted by Sang-drax
    To those of you who've tested the 2005 Express beta from microsoft:

    Does the latest C++ compiler from microsoft support unicode characters?

    I.e. will this code compile:
    Code:
    int main()
    {
      int åtta= 8;
    }
    I'm just curious. I cannot remember I've seen any compiler support this.
    THis works:

    Code:
    #include <stdio.h>
    
    int main()
    {
      int åtta= 8;
      char str[] = "åtta";
    
      printf("s: <%s>\n", str);
      printf("åtta = %d\n", åtta);
      return 0;
    }
    Output on Windows XP:

    s: <σtta>
    σtta = 8
    The compiler version is
    Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.40607.16 for 80x86
    Regards,

    Dave
    Last edited by Dave Evans; 12-09-2004 at 03:48 PM.

  3. #3
    S Sang-drax's Avatar
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    Nice. Thank you.
    I'll download the beta now.
    Last edited by Sang-drax : Tomorrow at 02:21 AM. Reason: Time travelling

  4. #4
    and the hat of wrongness Salem's Avatar
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    Why would you want such a thing?
    I doubt such code would be compilable on all C++ compilers

  5. #5
    S Sang-drax's Avatar
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    I don't know. Perhaps I can throw in some unicode characters when helping with the stupider kind of homework questions. When they complain I'll just reference to the standard.

    I noticed that my current compiler couldn't handle it and I just wanted to know if Microsofts new complier was any better.
    Last edited by Sang-drax : Tomorrow at 02:21 AM. Reason: Time travelling

  6. #6
    and the hat of wrongness Salem's Avatar
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    Perhaps you're confusing the source character set (the one the program is written in) with the execution character set (the one the program is able to use to communicate with the outside world)

  7. #7
    Yes, my avatar is stolen anonytmouse's Avatar
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    I did some testing with MSVC.NET a while back. If I remember correctly, it successfully compiled source code saved as UTF-8 or UTF-16LE. This was with the command line version, I'm not sure if the IDE offers the same support. I only tested with unicode characters in string literals, I can't vouch for unicode characters in variable names.

  8. #8
    S Sang-drax's Avatar
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    Quote Originally Posted by Salem
    Perhaps you're confusing the source character set (the one the program is written in) with the execution character set (the one the program is able to use to communicate with the outside world)
    I don't have the standard here at this computer, so I cannot quote anything. I'm quite sure some unicode characters can be used in identifier names though.
    I'll have to get back to this when my Internet connection starts working. It has been down for days.
    Last edited by Sang-drax : Tomorrow at 02:21 AM. Reason: Time travelling

  9. #9
    & the hat of GPL slaying Thantos's Avatar
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    Perhaps this is what you are looking for Sang-drax?
    Section 2.10.1
    1 An identifier is an arbitrarily long sequence of letters and digits. Each universal-character-name in an identifier shall designate a character whose encoding in ISO 10646 falls into one of the ranges specified in Annex E. Upper- and lower-case letters are different. All characters are significant.20)
    [...]
    20) On systems in which linkers cannot accept extended characters, an encoding of the universal-character-name may be used in forming valid external identifiers. For example, some otherwise unused character or sequence of characters may be used to encode the \u
    in a universal-character-name. Extended characters may produce a long external identifier, but C + + does not place a translation limit on significant characters for external identifiers. In C + +, upper- and lower-case letters are considered different for all identifiers, including
    external identifiers.

  10. #10
    S Sang-drax's Avatar
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    Yup, Annex E at the end of the document contains the valid characters that can be used. Quite a few, actually. BTW, my connection is up again.
    Last edited by Sang-drax : Tomorrow at 02:21 AM. Reason: Time travelling

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