From 7074240972877261432 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,c66ceaccc8f25e6b X-Google-Attributes: gidf78e5,public X-Google-ArrivalTime: 2002-04-05 11:29:01 PST Path: archiver1.google.com!news1.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: kevin_vanhorn@ndsu.nodak.edu (Kevin S. Van Horn) Newsgroups: comp.std.c++ Subject: Re: Allocators, standard containers, and assignment Date: Fri, 5 Apr 2002 19:28:24 GMT Organization: http://groups.google.com/ Approved: Fergus Henderson , moderator of comp.std.c++ Message-ID: <42aba677.0204051121.59ee7aca@posting.google.com> References: <42aba677.0203291151.ff4f74c@posting.google.com> <3ca4e319$0$20850$724ebb72@reader2.ash.ops.us.uu.net> X-Trace: mail2news.demon.co.uk 1018034908 mail2news:26475 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) Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit NNTP-Posting-Date: 5 Apr 2002 19:21:19 GMT Lines: 26 Xref: archiver1.google.com comp.std.c++:10412 "P.J. Plauger" wrote: > However it may seem to you, we did discuss this within the committee. > An allocator for a container is fixed at construction (to the extent that > you can tell). Why in the world was such a decision made? What benefit is there from such a choice? I've already mentioned one great disadvantage of such an approach: swap is needlessly complicated and made expensive in some circumstances. Another disadvantage is that this choice violates the principle of least surprise. One generally expects that after executing "x = y", then x and y are identical in all ways that affect their subsequent behavior (with the exception of addresses of the objects and their constituent parts). A similar comment holds for swap. --- [ 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 ]