From -7516971224671550333 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,839fa42e97baea86 X-Google-Attributes: gidf78e5,public From: Hyman Rosen Subject: Re: Placement new[] Compiler Depenent? Date: 1998/11/20 Message-ID: <36535E69.CB09EC8B@prolifics.com>#1/1 X-Deja-AN: 413780638 Content-Transfer-Encoding: 7bit Approved: Fergus Henderson References: <72v90t$9uq$1@engnews2.Eng.Sun.COM> X-Original-Date: Wed, 18 Nov 1998 18:55:21 -0500 X-Accept-Language: en Content-Type: text/plain; charset=us-ascii X-Complaints-To: news@news.unimelb.edu.au X-Trace: izvestia.its.unimelb.edu.au 911544604 20643 128.250.29.16 (20 Nov 1998 06:50:04 GMT) Organization: Prolifics X-Auth: PGPMoose V1.1 PGP comp.std.c++ iQBFAgUANlURBuEDnX0m9pzZAQEpbQF/bi4zUBr9AB683DF4v1XJbr/X96v+h+gh El1fyt+/s/Kt1nIbAEKMwej9Jm2tQEgI =32kU Mime-Version: 1.0 NNTP-Posting-Date: 20 Nov 1998 06:50:04 GMT Newsgroups: comp.std.c++ Steve Clamage wrote: > The added overhead must be an integral multiple of the worst-case > alignment for any object that fits in requested size. Unfortunately, > there is no standard way to find out what that alignment is, and > no way to find out what integral multiple the compiler uses. (At > least, not from inside the program using portable code. The compiler > documentation might tell you, but of course the value can differ > among implementations.) Really? How about this? struct sizer { }; void *operator new[](size_t b, const sizer &) { throw b; } template size_t size(size_t n) { sizer s; try { new(s) T[n]; } catch (size_t b) { return b; } } --- [ 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://reality.sgi.com/austern_mti/std-c++/faq.html ]