From -1690121821313726194 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,3b852614b232b53b X-Google-Attributes: gidf78e5,public From: AllanW@my-dejanews.com Subject: Re: function pointer types(was: Re: atexit() behavior) Date: 1998/12/03 Message-ID: <746qnq$g51$1@nnrp1.dejanews.com>#1/1 X-Deja-AN: 418368406 X-NNTP-Posting-Host: 199.125.171.8 Approved: stephen.clamage@sun.com (comp.std.c++) References: <365f3482.0@10.1.1.65> <73vc1v$5oe$1@nnrp1.dejanews.com> <3663B9D8.283B0424@physik.tu-muenchen.de> <741t78$a8v$1@nnrp1.dejanews.com> <366656F7.6AD69015@physik.tu-muenchen.de> X-Snookums: I love you X-UID: 0000000002 X-Status: $$$T X-Http-User-Agent: Mozilla/4.06 [en] (Win95; U) X-Http-Proxy: 1.0 x9.dejanews.com:80 (Squid/1.1.22) for client 199.125.171.8 Organization: Deja News - The Leader in Internet Discussion X-Article-Creation-Date: Thu Dec 03 20:02:04 1998 GMT Newsgroups: comp.std.c++ Originator: clamage@taumet In article <366656F7.6AD69015@physik.tu-muenchen.de>, Christopher Eltschka wrote: > >AllanW@my-dejanews.com wrote: > > > > In article <3663B9D8.283B0424@physik.tu-muenchen.de>, > > Christopher Eltschka wrote: > > > Does that mean that I can do > > > > > > bool is_c_function(void(*)()) { return false; } > > > extern "C" > > > { > > > bool is_c_function(void(*)()) { return true; } > > > } > > > > This is equivalent to what the standard does, and (at least for > > user-written code) it is illegal. > > > > > and use that to differentiate between C and C++ functions? > > > > I think you want is > > bool is_c_function(extern "C" void(*)()) { return true; } > > bool is_c_function(extern "C++" void(*)()) { return false; } > > The difference here is that we're using two different parameter > > types, rather than two different return types. > >But since my second function is declared in an extern "C" block, >AFAIK the parameter should be a pointer to C function. >BTW, I don't think you may use extern "C" inside the parameter list. You're right. Your version should work, and mine is illegal. Steve Clamage explained why in another post. Sorry if I misled you. -- AllanW@my-dejanews.com is a "Spam Magnet" -- never read. Please reply in USENET only, sorry. -----------== Posted via Deja News, The Discussion Network ==---------- http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own [ 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 ]