From -7000813537416771974 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,55e8373857946bb6 X-Google-Attributes: gidf78e5,public From: James Kanze Subject: Re: preprocessor example Date: 1997/03/05 Message-ID: #1/1 X-Deja-AN: 223281801 References: <199703031925.WAA04822@such.srcc.msu.su> X-Original-Date: 05 Mar 1997 10:41:15 +0100 Organization: - X-Auth: PGPMoose V1.1 PGP comp.std.c++ Newsgroups: comp.std.c++ Alexander Krotoff writes: |> This is about 2nd CD section 16.3.5 [cpp.scope] pagraph 6. |> |> In the exaple symbol `@' is used. As far as I see |> this symbol do not form any preprocessing token and |> even cannot be used in the preprocessing token. |> |> Is this example incorrect ? Not at all. "@" is a valid preprocessing token; under 2.4, one of the valid forms of a preprocessing token is: "each non-white-space character that cannot be one of the above". "@" qualifies under this rule. Of course, if the '@' gets through the preprocessing, there will be no way to convert it into a valid token. However, it can still be legally used in the preprocessor, either as (part of) an argument to # (as in the example), or in building a file name, e.g.: #define FUNNY_FILE_NAME < ## @ ## .h ## > #include FUNNY_FILE_NAME -- James Kanze home: kanze@gabi-soft.fr +33 (0)1 39 55 85 62 office: kanze@vx.cit.alcatel.fr +33 (0)1 69 63 14 54 GABI Software, Sarl., 22 rue Jacques-Lemercier, F-78000 Versailles France -- Conseils en informatique industrielle -- --- [ comp.std.c++ is moderated. To submit articles: try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ FAQ: http://reality.sgi.com/employees/austern_mti/std-c++/faq.html ] [ Policy: http://reality.sgi.com/employees/austern_mti/std-c++/policy.html ] [ Comments? mailto:std-c++-request@ncar.ucar.edu ]