From -7536935838260011913 X-Google-Thread: f78e5,174aa7b34b06a51 X-Google-Attributes: gidf78e5,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news4.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local01.nntp.dca.giganews.com!nntp.speakeasy.net!news.speakeasy.net.POSTED!not-for-mail NNTP-Posting-Date: Tue, 06 Dec 2005 21:40:38 -0600 Return-Path: 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) Delivered-To: std-c++@ucar.edu From: "ThosRTanner" Newsgroups: comp.std.c++ Subject: Re: Is this really unspecified behavior? Organization: http://groups.google.com Message-ID: <1133887764.580879.73650@g44g2000cwa.googlegroups.com> References: <1132629737.664847.151630@o13g2000cwo.googlegroups.com> <1132662585.882464.24110@f14g2000cwb.googlegroups.com> <1132759176.368850.264850@g43g2000cwa.googlegroups.com> <1132933832.802917.153350@g14g2000cwa.googlegroups.com> <1133551647.532929.325730@z14g2000cwz.googlegroups.com> <1133583412.951239.208510@g49g2000cwa.googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" X-Complaints-To: groups-abuse@google.com User-Agent: G2/0.2 X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20051111 Firefox/1.5,gzip(gfe),gzip(gfe) Complaints-To: groups-abuse@google.com Injection-Info: g44g2000cwa.googlegroups.com; posting-host=199.172.169.15; posting-account=WDL57QwAAADh6I7Opo5K2PCbyz8hJhRA X-Virus-Scanned: amavisd-new at ucar.edu X-Virus-Scanned: amavisd-new at cs.mu.OZ.AU Approved: Fergus Henderson , moderator of comp.std.c++ X-Virus-Scanned: amavisd-new at cs.mu.OZ.AU Date: Tue, 6 Dec 2005 21:34:22 CST Lines: 34 NNTP-Posting-Host: 65.182.171.162 X-Trace: sv3-a7GQqfJSFdso7pz7Te8J75qZVMgXzjzkFqvkeICWinnxNlqalKoNGlDUEJCyijc+ShPnYSvbLrDpslm!X/03xVy1P7mX2PLNvMchVOevu1ioItl9XobJ6Ze+JmviY4BGWfBtO28DNMmBiziPU1Qr/bCezDPo!MuFv6QkofUS1rlKiI8sWxlibsJa/LKYzLRaFzVnaig== X-Complaints-To: abuse@speakeasy.net X-DMCA-Complaints-To: abuse@speakeasy.net X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.32 Xref: g2news1.google.com comp.std.c++:2680 Hyman Rosen wrote: > kuyper@wizard.net wrote: > > I wouldn't have used the phrase "probably", if I knew for certain that > > any such idioms exist. > > I don't know for sure, but one guess would be code like this, > cout << "xxx" << f() << "yyy" << g() << "zzz" << h() << "\n"; > where the authors don't realize that the function calls can > happen in any order. The compiler which they use happens to give > them an order which works, but there may be some particular order > of evaluation which would be bad, and it silently lurks in the > code until one day it shows up because of some change to compiler > version. > > I would say that the apparent semantics of this code (first print > this, then that, then that) are so strong that it takes unusual > mental effort to realize that the calls are not (necessarily) made > left-to-right. Isn't that one situation where it will work as expected, because it "translates to": operator<<(operator<<(operator<<(operator<<(cout, "\n"), h()), "zzz"), g(), "yyy") etc etc and there's a sequence point after every function 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://www.jamesd.demon.co.uk/csc/faq.html ]