From 7962662912317021813 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,ede379f5dbbc1549 X-Google-Attributes: gidf78e5,public From: "Darin Adler" Subject: Re: Suggestion: "typeof" keyword Date: 1999/08/24 Message-ID: <7puugq$4dn@enews1.newsguy.com>#1/1 X-Deja-AN: 516771653 X-NNTP-Posting-Host: news.newsdawg.com Content-Transfer-Encoding: 7bit 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> <230819991621180849%lisa_lippincott@advisories.com> X-UID: 0000000001 X-Status: $$$T Content-Type: text/plain; charset="US-ASCII" Organization: http://extra.newsguy.com Mime-Version: 1.0 Newsgroups: comp.std.c++ Originator: clamage@taumet Lisa Lippincott writes: >> 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? Hyman Rosen wrote: > Is the following illegal? Gcc compiles it without error or warning. > > #include > enum { a }; enum { b }; > template void f(T v) { cout << v << endl; } > int main() { f(a); f(b); } Other than the lack of "std::" before "cout" and "endl", I don't see anything wrong with the code above. On the other hand, your example doesn't address the point of Lisa's example. Your example calls the std::basic_ostream<> inserter for one of the integral types. Since there's no exact match for the anonymous enum type, overload matching performs standard conversions, which include integral promition of an rvalue of enumerated type to int, unsigned int, long, or unsigned long. -- Darin [ 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 ]