From 2826790144379776261 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,5be30c38f618a07b X-Google-Attributes: gidf78e5,public X-Google-ArrivalTime: 2002-04-30 11:45:02 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news.tele.dk!small.news.tele.dk!194.213.69.151!news.algonet.se!algonet!newspeer.clara.net!news.clara.net!kibo.news.demon.net!news.demon.co.uk!demon!mail2news.demon.co.uk!not-for-mail From: David Schwartz Newsgroups: comp.std.c++ Subject: Re: Why switch w/ only integral types? Date: Tue, 30 Apr 2002 18:44:01 GMT Organization: WebMaster Incorporated Approved: Fergus Henderson , moderator of comp.std.c++ Message-ID: <3CCE6310.672E55DF@webmaster.com> References: <6ee7d287.0203202005.63e0b7b3@posting.google.com> X-Trace: mail2news.demon.co.uk 1020192245 mail2news:25099 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: Tue, 30 Apr 2002 09:25:36 +0000 (UTC) X-Accept-Language: en Lines: 33 Xref: archiver1.google.com comp.std.c++:10910 Carl Daniel wrote: > Nevertheless, there are many languages which do permit arbirtray types in > switch/case constructs, so I doubt there's any technical reason why C++ > couldn't have been specified that way. There are reasons. Consider: MyFoo f; switch (f) { case 1: // code case 2: // code } What should happen if MyFoo::operator==(int) returns 'true' for both 1 and 2? In an event, switch/case is largely obsolete and on many platforms is actually slower than corresponding if/else code at low levels of optimization. DS --- [ 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.jamesd.demon.co.uk/csc/faq.html ]