From -6590423634897859796 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,ede379f5dbbc1549 X-Google-Attributes: gidf78e5,public From: sirwillard@my-deja.com Subject: Re: Suggestion: "typeof" keyword Date: 1999/08/16 Message-ID: <7pa195$prj$1@nnrp1.deja.com>#1/1 X-Deja-AN: 513583883 X-NNTP-Posting-Host: 167.16.75.51 Approved: stephen.clamage@sun.com (comp.std.c++) References: <7nt3vl$1oe$1@nnrp1.deja.com> <7oh7o8$t3f$1@nnrp1.deja.com> <7ol6hi$ej9$2@news.BelWue.DE> <7oup0a$8g2$1@nnrp1.deja.com> <37B2E9B8.491D@wanadoo.fr> <37B43D99.608A@wanadoo.fr> X-UID: 0000000001 X-Status: $$$T X-Http-User-Agent: Mozilla/4.0 (compatible; MSIE 5.0; Windows NT) X-Http-Proxy: 1.1 x29.deja.com:80 (Squid/1.1.22) for client 167.16.75.51 Organization: Deja.com - Share what you know. Learn what you don't. X-Article-Creation-Date: Mon Aug 16 21:53:46 1999 GMT X-MyDeja-Info: XMYDJUIDsirwillard Newsgroups: comp.std.c++ Originator: clamage@taumet In article <37B43D99.608A@wanadoo.fr>, Valentin Bonnard wrote: > > Siemel B. Naran wrote: > > > On 12 Aug 99 15:37:37 GMT, Valentin Bonnard wrote: > > >sirwillard@my-deja.com wrote: > > > > >> base* p = new derived; > > >> typeof(*p) copy(*p); > > > > > >This one is easy: it's crystal-clear that it should create > > >a base initialized with the derived object. Not so crystal clear. The first thing that must be decided is if 'typeof' performs static typing or runtime typing. Seems people don't agree on this one within this thread. This is why I brought the subject up... not because we can't come to a conclusion and define proper semantics for it, but because the proper semantics have to be defined in order to make a proposal. > > it's crystal-clear that it should create > > a base initialized with the base part of 'p', even if there > > is a constructor base::base(const derived&). That is, we > > have a call to base::base(const base&). > > The object passed to the ctor is still a derived object. Is it? By dereferencing a base pointer, did I not slice the object? Sent via Deja.com http://www.deja.com/ Share what you know. Learn what you don't. [ 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 ]