From -5326682793945032984 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,ea96cc047f6a22cc X-Google-Attributes: gidf78e5,public X-Google-ArrivalTime: 2001-08-10 14:31:01 PST Path: archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news.tele.dk!small.news.tele.dk!212.74.64.35!colt.net!dispose.news.demon.net!news.demon.co.uk!demon!mail2news.demon.co.uk!not-for-mail From: Francis Glassborow Newsgroups: comp.std.c++ Subject: Re: extern "C" -- what is the intent? Date: Fri, 10 Aug 2001 21:30:17 GMT Organization: Southfield Microcomputer SS Approved: Fergus Henderson , moderator of comp.std.c++ Message-ID: References: <090820010209154805%BobbySchmidt@mac.com> <3B733FA0.EFE7F4D5@wizard.net> Reply-To: Francis Glassborow X-Trace: mail2news.demon.co.uk 997479023 mail2news:10208 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) MIME-Version: 1.0 X-Newsreader: Turnpike Integrated Version 5.00 U Lines: 27 Xref: archiver1.google.com comp.std.c++:6932 In article <3B733FA0.EFE7F4D5@wizard.net>, James Russell Kuyper Jr. writes >It works the other way too; a >name of a function or object defined in C++ can be used from C code, if >the C++ definition declares it with C language linkage. And (and this is very important) the C compiler has a compaitble calling sequence (most C compilers use the same one, but I do know ones that do not, for example TopSpeed C - one of the very first compilers to get full validation in the UK as ISO compliant) used name mangling to ensure type safe linkage (and I believe this is allowed, just not required in C). There is also the requirement for compatible types. A C++ compiler that uses a 32-bit int will not work correctly with a C compiler that happens to use a 16-bit int. (and, of course the same problem exists between C compilers) Francis Glassborow ACCU 64 Southfield Rd Oxford OX4 1PA +44(0)1865 246490 All opinions are mine and do not represent those of any organisation --- [ 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 ]