From -4638001631789072400 X-Google-Language: ENGLISH,ASCII X-Google-Thread: f78e5,972722ed514d508a X-Google-Attributes: gidf78e5,public X-Google-ArrivalTime: 2001-07-30 03:33:00 PST Path: archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!dispose.news.demon.net!news.demon.co.uk!demon!mail2news.demon.co.uk!not-for-mail From: "Anthony Williams" Newsgroups: comp.std.c++ Subject: Re: try block as main block of a function Date: Mon, 30 Jul 2001 10:32:35 GMT Approved: Fergus Henderson , moderator of comp.std.c++ Message-ID: <9k34ms$2akk5$1@ID-49767.news.dfncis.de> References: <3b6061b5.1188820@news.terra.es> <9jr8bd$19vqd$1@ID-49767.news.dfncis.de> X-Trace: mail2news.demon.co.uk 996489160 mail2news:6180 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) X-Orig-NNTP-Posting-Host: 47.160.2.96 X-Orig-X-Trace: fu-berlin.de 996480540 2445957 47.160.2.96 (16 [49767]) X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.50.4522.1200 X-MIMEOLE: Produced By Microsoft MimeOLE V5.50.4522.1200 Lines: 41 Xref: archiver1.google.com comp.std.c++:6813 "Francis Glassborow" wrote in message news:OOB2fjAifdY7Ewle@ntlworld.com... > In article <9jr8bd$19vqd$1@ID-49767.news.dfncis.de>, Anthony Williams > writes > >Why would you not advocate using function try blocks? > > Because many will forget that they automatically rethrow if you do not > do so. I hate default behaviour as it often hides errors. 8.4p16 says: "The exception being handled is rethrown if control reaches the end of a handler of the function-try-block of a constructor or destructor. Otherwise, a function returns when control reaches the end of a handler for the function-try-block (6.6.3). Flowing off the end of a function-try-block is equivalent to a return with no value; this results in undefined behavior in a value-returning function (6.6.3)." Thus it seems that function try blocks only have this behaviour in constructors and destructors. I'll go with not recommending them for destructors, but their use with constructors is the reason they were introduced in the first place (as you said in your original reply). For functions it saves a level of indentation and a pair of braces, but otherwise is identical to a function body containing nothing but a try block. The only reason I can see for not recommending it is portability (e.g.Daniel Garc�a's original problem wrt MSVC). Anthony -- Anthony Williams Software Engineer, Nortel Networks Optoelectronics The opinions expressed in this message are not necessarily those of my employer --- [ 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 ]