From -6004182548199292947 X-Google-Thread: f78e5,f1baa317914feeaf X-Google-Attributes: gidf78e5,domainid0,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news2.google.com!news2.google.com!newshub.sdsu.edu!news.alt.net!frodo.cs.rpi.edu!not-for-mail From: litb Newsgroups: comp.std.c++ Subject: Re: typeof keyword Date: Wed, 25 Mar 2009 18:18:55 CST Organization: http://groups.google.com Lines: 24 Sender: cppmods@cs.rpi.edu Approved: stephen.clamage@sun.com Message-ID: <673d7f2d-bf05-4af5-8d09-e59907a6e4f5@g38g2000yqd.googlegroups.com> References: <488de3d4-77ac-4c01-8130-d196dec70bc8@v15g2000yqn.googlegroups.com> NNTP-Posting-Host: netlab.cs.rpi.edu Content-Type: text/plain; charset=ISO-8859-1 To: (Usenet) Return-Path: X-Original-Date: Tue, 24 Mar 2009 16:46:09 -0700 (PDT) X-Submission-Address: std-c++@netlab.cs.rpi.edu Xref: g2news2.google.com comp.std.c++:340 On 25 Mrz., 01:06, eminha...@googlemail.com wrote: > hi, > i was wondering if a typeof keyword is going to be defined in the new > standard? > i, personnally, would find it very helpful. > Yeah, it's called decltype. It can give you the declared type of a variable and type of expressions. Search in the working draft ( http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2857.pdf ) for decltype. Useful for example in this case: template auto f(A const& a, B const& b) -> decltype(a + b) { return a + b; } Where we get the right return type without "clever" template trickery and with simple code. -- [ 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 ]