From 2485487839910149683 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,3b852614b232b53b X-Google-Attributes: gidf78e5,public From: James Kuyper Subject: Re: function pointer types(was: Re: atexit() behavior) Date: 1998/12/01 Message-ID: <366402C8.167E@wizard.net>#1/1 X-Deja-AN: 417531028 X-NNTP-Posting-Host: gscsgi02.gsfc.nasa.gov Content-Transfer-Encoding: 7bit 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> Content-Type: text/plain; charset=us-ascii Organization: NASA Goddard Space Flight Center -- Greenbelt, Maryland USA Mime-Version: 1.0 Newsgroups: comp.std.c++ Originator: clamage@taumet Christopher Eltschka wrote: > Francis Glassborow wrote: > [...] > > I think they have different signatures because the parameters are: > > > > pointer to extern "C" function > > and > > pointer to extern "C++" function > > > > and these types are differentiable. > Does that mean that I can do > bool is_c_function(void(*)()) { return false; } > extern "C" > { > bool is_c_function(void(*)()) { return true; } > } > and use that to differentiate between C and C++ functions? No. The atexit() functions take an argument which can be either "C" or "C++", and you can overload on argument types. Both of your functions have the same argument type. How would the compiler know which one to call? [ 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 ]