From -5262729570037128366 X-Google-Thread: f78e5,a10702d4a7db0a94 X-Google-Attributes: gidf78e5,public X-Google-Language: ENGLISH,ASCII Path: g2news2.google.com!news1.google.com!news4.google.com!news.glorb.com!peer1.news.newnet.co.uk!194.159.246.34.MISMATCH!peer-uk.news.demon.net!kibo.news.demon.net!news.demon.co.uk!demon!stump.algebra.com!devnull From: tommi.hoynalanmaa@iki.fi (=?ISO-8859-1?Q?Tommi_H=F6yn=E4l=E4nmaa?=) Newsgroups: comp.std.c++ Subject: Re: Why no size_t to ::operator delete? Date: Tue, 26 Dec 2006 19:03:02 GMT Organization: Saunalahti Customer Lines: 33 Sender: mail2news@demon.net Approved: fjh@cs.mu.oz.au (Fergus Henderson , moderator of comp.std.c++) Message-ID: References: <12omt8jit7rl379@corp.supernews.com> <12or0p6oph82af5@corp.supernews.com> NNTP-Posting-Host: news.news.demon.net Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: news.demon.co.uk 1167159791 19198 158.152.254.254 (26 Dec 2006 19:03:11 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Tue, 26 Dec 2006 19:03:11 +0000 (UTC) X-Original-To: std-c++@mailman.ucar.edu X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-User-Agent: Thunderbird 1.5.0.8 (X11/20061117) X-MIME-Autoconverted: from 8bit to quoted-printable by mulga.csse.unimelb.edu.au id kBQJ382C005673 X-Virus-Scanned: amavisd-new at csse.unimelb.edu.au X-Path: comp-std-cpp-robomod!not-for-mail X-Received: (from fjh@localhost) by mulga.csse.unimelb.edu.au (8.13.8+Sun/8.13.8/Submit) id kBQJ32Hx005643; Wed, 27 Dec 2006 06:03:02 +1100 (EST) X-NNTP-Posting-Date: Tue, 26 Dec 2006 11:22:28 EET X-Delivered-To: std-c++@mailman.ucar.edu X-Authentication-Warning: mulga.csse.unimelb.edu.au: fjh set sender to devnull@stump.algebra.com using -f X-Newsgroups: comp.std.c++ Xref: g2news2.google.com comp.std.c++:5173 Scott Meyers kirjoitti: >=20 > I don't see how it's any more error-prone than the class-specific=20 > version of operator delete that takes a size. >=20 Suppose we a pointer to some base class A and it actually points to an=20 object of derived class B that inherits from A: --- A* a =3D new B; delete a; --- Suppose that A has a virtual destructor. Then a class-specific delete operator in A with a size_t argument always=20 gets the correct size of the object to be deleted (sizeof (B) in this cas= e). If we had a size_t argument in the global delete operator it would=20 probably get sizeof(A) in the example above. However, it might be=20 possible to pass the correct runtime size of objects to global operator=20 delete for classes having virtual destructors. --=20 Tommi H=F6yn=E4l=E4nmaa s=E4hk=F6posti / e-mail: tommi.hoynalanmaa@iki.fi kotisivu / homepage: http://www.iki.fi/tohoyn/ --- [ 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.comeaucomputing.com/csc/faq.html ]