From 4090924017659668665 X-Google-Thread: 7894ca11fe,661f9f6c1b45f277 X-Google-Attributes: gid7894ca11fe,public,usenet X-Google-NewGroupId: yes X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news2.google.com!news1.google.com!Xl.tags.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Thu, 06 May 2010 20:30:08 -0500 Return-Path: To: (Usenet) From: CornedBee Newsgroups: comp.std.c++ Subject: Re: Two thoughts about attributes in the FCD Organization: http://groups.google.com Sender: cppmods@cs.rpi.edu Approved: james.dennett@gmail.com Message-ID: <6d83d9a8-b1a3-4567-a225-ae494f616470@h9g2000yqm.googlegroups.com> References: <83rbioFejhU1@mid.individual.net> Content-Type: text/plain; charset=ISO-8859-1 X-Original-Date: Thu, 6 May 2010 06:13:07 -0700 (PDT) X-Submission-Address: std-c++@netlab.cs.rpi.edu Date: Thu, 6 May 2010 20:22:48 CST Lines: 32 X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-XjZWiKIdzosnI27ojTCPZrH85k9aPDsKMNCx8pDQBixuTs8FRboviZt+arunCHlhKLirqC5ZZM7E2ao!WgB0Wthq3/BN+e/W4uoehol55VtBIW3jSq1Y3CigjuXfeEohPWEJf1Zb3CjMRiS+RCwNDmLE1xDB!ZNN5OILlaQCrnDTpIJHKTM4wVg== X-Complaints-To: abuse@giganews.com X-DMCA-Notifications: http://www.giganews.com/info/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Xref: g2news2.google.com comp.std.c++:2521 On Apr 30, 11:24 pm, Olaf Krzikalla wrote: > > For unknown attributes in the global and std namespace we can change > from ub to ill-formed. Thus the issue exists (if at all) for > implementation specific attributes only - as it does for pragmas. > The attribute namespace makes things even better, since an > implmentation can simply define, that any attribute in a particular > namespace is recognized (and in case it is misspelled makes the > program ill-formed). If we ever get a reflection API for C++ (and I hope we do and am working towards it), I think one very essential feature will be to have attributes that are defined by metadata processing libraries. This scheme has proven to be extraordinarily successful in Java, with annotations for unit testing, object-relational mapping, object-XML mapping, automatic generation of web services, transaction scope management, and endless more things. Thus, while marking the global, std, and some implementation-defined namespaces as off-limits for extension is useful, I believe it to be absolutely essential for arbitrary attribute token sequences to be permitted in general. Sebastian -- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@netlab.cs.rpi.edu] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.comeaucomputing.com/csc/faq.html ]