From -3739802581027905081 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,ede379f5dbbc1549 X-Google-Attributes: gidf78e5,public From: Lisa Lippincott Subject: Re: Suggestion: "typeof" keyword Date: 1999/08/23 Message-ID: <230819991621180849%lisa_lippincott@advisories.com>#1/1 X-Deja-AN: 516370903 X-NNTP-Posting-Host: 38.168.253.3 Content-Transfer-Encoding: 8bit Approved: stephen.clamage@sun.com (comp.std.c++) References: <7nt3vl$1oe$1@nnrp1.deja.com> <7oh7o8$t3f$1@nnrp1.deja.com> <7ol6hi$ej9$2@news.BelWue.DE> <7oup0a$8g2$1@nnrp1.deja.com> <37B3C2AD.5AB722AE@lucent.com> <37B5A571.449B@wanadoo.fr> <37B908A8.717CAC2C@lucent.com> <7pcvjs$tk4$1@nnrp1.deja.com> <7phk8n$b26$1@nnrp1.deja.com> <37BD2185.C0047293@physik.tu-muenchen.de> <7pk6r6$689$1@nnrp1.deja.com> <37C1B67F.B5B0B51A@cds.duke.edu> X-UID: 0000000001 X-Status: $$$T Content-Type: text/plain; charset=Macintosh X-Trace: client 935450252 38.168.253.3 (Mon, 23 Aug 1999 19:17:32 EDT) Organization: - Mime-Version: 1.0 User-Agent: YA-NewsWatcher/4.2.2 NNTP-Posting-Date: Mon, 23 Aug 1999 19:17:32 EDT Newsgroups: comp.std.c++ Originator: clamage@taumet Here's a potential trouble spot with typeof: it allows a program to refer to unnamed classes and enums, which may cause havoc with linkage. Consider: enum {a}; enum {b}; void f( typeof(a) ); void f( typeof(b) ); What are the linkage names of the functions f? This problem could be avoided by adding (perhaps to 3.5 paragraph 8) Class and enum types without names shall not be used to declare an entity with linkage, unless the type is defined in a typedef declaration and has the typedef name for linkage purposes. I think this statement follows from the current standard, but the typeof proposal as it stands would allow it to be violated. --Lisa Lippincott [ 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://reality.sgi.com/austern_mti/std-c++/faq.html ]