From -6361154282686051448 X-Google-Thread: f78e5,59c47fe3b9dfca8e X-Google-Attributes: gidf78e5,public X-Google-Language: ENGLISH,ASCII-7-bit Return-Path: X-Authentication-Warning: mulga.cs.mu.OZ.AU: fjh set sender to devnull@stump.algebra.com using -f Path: g2news1.google.com!news4.google.com!newsfeed.stanford.edu!cyclone.bc.net!news.alt.net!comp-std-cpp-robomod!not-for-mail X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) Delivered-To: std-c++@ucar.edu From: "msalters" Newsgroups: comp.std.c++ Subject: Re: UCNs in phase 1 Organization: http://groups.google.com Message-ID: <1107172715.062014.235540@z14g2000cwz.googlegroups.com> References: <1106212184.380589.161860@z14g2000cwz.googlegroups.com> <1106313530.204408.11090@z14g2000cwz.googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" X-Trace: posting.google.com 1107172719 7924 127.0.0.1 (31 Jan 2005 11:58:39 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Mon, 31 Jan 2005 11:58:39 +0000 (UTC) User-Agent: G2/0.2 Complaints-To: groups-abuse@google.com Injection-Info: z14g2000cwz.googlegroups.com; posting-host=212.123.206.71; posting-account=G8Vn6AwAAAAe3s4qFj7nFOuhEuzTNEir X-Spamscanner: mailbox8.ucsd.edu (v1.5 Dec 3 2004 17:34:44, -2.8/5.0 3.0.0) X-MailScanner: PASSED (v1.2.8 63787 j0VBwd90064304 mailbox8.ucsd.edu) X-Virus-Scanned: by amavisd-new at cs.mu.OZ.AU Approved: Fergus Henderson , moderator of comp.std.c++ X-Virus-Scanned: by amavisd-new at cs.mu.OZ.AU Date: Mon, 31 Jan 2005 12:22:27 CST Xref: g2news1.google.com comp.std.c++:3995 Stephan Bergmann wrote: > msalters wrote: > > neil@daikokuya.co.uk wrote: > > > >>In view of lex.phases paragraph 1, given a translation unit > >> > >>#define str(x) #x > >>char array[] = str($); > >> > >>what characters should array[] contain? > > > > > > $ isn't in the set of supported characters, so anything would be legal. > > (2.2/1 The basic source character set ). An error would be legal as > > well, > > in fact I think a diagnostic is required. > > Oh, yes, you are probably right: If $ is translated in phase 1 to > \u0024 or \U00000024, then it is translated in phase 3 to an identifier > preprocessing-token, which is malformed, as "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." [2.10/1] > > However, if $ is translated in phase 1 to \u00c0... then it must be treated as if you wrote (2.2/1.1) #define str(x) #x char array[] = str(\u00c0); \u00c0 is a UCN, and a pp-token which cannot be a phase 7 token. However, in phase 4 the # operator is applied which turns the \u00c0 pp-token into a quoted form ("\\u00c0"). This quoted pp-token will turn into a string literal in phase 7. Regards, Michiel Salters --- [ 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 ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.jamesd.demon.co.uk/csc/faq.html ]