From 3602585233638261198 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,bb04047befc790b4 X-Google-Attributes: gidf78e5,public X-Google-ArrivalTime: 2001-02-22 11:34:05 PST Path: supernews.google.com!sn-xit-03!supernews.com!freenix!isdnet!grolier!dispose.news.demon.net!news.demon.co.uk!demon!mail2news.demon.co.uk!not-for-mail From: Jack Klein Newsgroups: comp.std.c++ Subject: Re: empty parameter list and extern "C" Date: Thu, 22 Feb 2001 19:32:10 GMT Organization: AT&T Worldnet Approved: Fergus Henderson , moderator of comp.std.c++ Message-ID: References: <3a91a017.213629713@news.nikoma.de> X-Trace: mail2news.demon.co.uk 982870336 mail2news:18507 mail2news mail2news.demon.co.uk X-Complaints-To: abuse@demon.net X-Mail2News-Path: news.demon.net!mulga.cs.mu.oz.au X-Authentication-Warning: mulga.cs.mu.OZ.AU: fjh set sender to devnull@stump.algebra.com using -f X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-Newsreader: Forte Agent 1.8/32.548 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit NNTP-Posting-Date: Thu, 22 Feb 2001 07:20:56 GMT Lines: 47 Xref: supernews.google.com comp.std.c++:3743 On Wed, 21 Feb 2001 19:51:25 GMT, MikeAlpha@NoSpam_csi.com (Martin Aupperle) wrote in comp.std.c++: > Hello, > > I hope that I remember right that a function with the signature > > void f(); > > and compiled under a C-compiler can be called with arbitrary > arguments. > But when I declare > > extern "C" void f(); > > and compile under a C++ compiler, I cannot call f with arguments. > > Is it correct that an empty argument list means "no arguments" even if > we compile against an implementation that allows it ( here, the > implementation of f is likely to be in a C-Module that must make no > assumptions about the arguments and therefore can be called with > arbitrary ones) ? > > Thanks - Martin Yes, that is correct. Defining anything with C linkage via extern "C" does not make it C when compiled by a C++ compiler. Only the linkage is affected, and the standard does not actually provide a rigorous definition of linkage, except to point out some limitations that this imposes. Understand that C++ does not guarantee interoperability with code compiled by a C compiler, or even by the same compiler in its C mode, if it has one. The intent is to provide this capability if possible, but all that extern "C" is guaranteed to do is provide C linkage. -- Jack Klein Home: http://JK-Technology.Com --- [ 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.research.att.com/~austern/csc/faq.html ] [ Note that the FAQ URL has changed! Please update your bookmarks. ]