From -7701856950670819316 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,d93488bb970aa444 X-Google-Attributes: gidf78e5,public X-Google-ArrivalTime: 2001-06-19 15:53:02 PST Path: archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!newsfeeds.belnet.be!news.belnet.be!newsfeed.icl.net!dispose.news.demon.net!news.demon.co.uk!demon!mail2news.demon.co.uk!not-for-mail From: Pete Becker Newsgroups: comp.std.c++ Subject: Re: How to test for NaNs and infinites? Date: Tue, 19 Jun 2001 22:51:40 GMT Organization: Dinkumware, Ltd Approved: Fergus Henderson , moderator of comp.std.c++ Message-ID: <3B2FD6B9.92D9F072@acm.org> References: <3B176D2F.70C3E7F7@meteo.fr> <9fql8h$pfg$1@news.hal-pc.org> <3B21100E.5B25F7AA@acm.org> <9frdlp$14bc$1@news.hal-pc.org> <9g2em7$1pkk$1@news.hal-pc.org> <9g7q93$1lu1$1@news.hal-pc.org> <3B278187.9E196C80@acm.org> <9g8a84$1uah$1@news.hal-pc.org> <3B28B104.807ED9AC@acm.org> <9gdpcm$267r$1@news.hal-pc.org> <9gnjf5$1q76$1@news.hal-pc.org> <3B2F9717.D5017BD6@bear.com> <9go7h8$26jn$1@news.hal-pc.org> X-Trace: mail2news.demon.co.uk 992991142 mail2news:12287 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 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit NNTP-Posting-Date: 19 Jun 2001 22:48:47 GMT X-Accept-Language: en Lines: 42 Xref: archiver1.google.com comp.std.c++:6210 Greg Brewer wrote: > > There was nothing illegal in the code. It just crashed. It crashed > because the structure layout no longer matched the data layout in the binary > file we read from. Which is an example of erroneous data, since the C standard says that you can only read binary data that was written with a program compiled with the same compiler. > If he had used shorts as instructed then the move to 32 > bit code would have gone a lot smoother. Yes, probably, but it's still undefined behavior under the C standard (and, therefore, under the C++ standard). > The one thing that was of recent > concern was the possibility that a 64 bit version of the compiler would > implement longs as 8 bytes. > > The short of it is that it is an error to assume a length for an int. As well as to assume the length for a short or a long. > It is > not illegal! > True, but irrelevant. The statement that started this off was about erroneous code being called illegal, not about whether there are other things that are also illegal. -- Pete Becker Dinkumware, Ltd. (http://www.dinkumware.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 ]