220 8361 <59bb86d3-995e-43dc-b5c3-0bf1bfc9620f@isocpp.org> article Path: news.gmane.org!not-for-mail From: Evgeny Panasyuk Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Proposal: Default swap operation Date: Thu, 2 Jan 2014 01:02:11 -0800 (PST) Lines: 68 Approved: news@gmane.org Message-ID: <59bb86d3-995e-43dc-b5c3-0bf1bfc9620f@isocpp.org> References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_7305_12351074.1388653331614" X-Trace: ger.gmane.org 1388653329 18727 80.91.229.3 (2 Jan 2014 09:02:09 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 2 Jan 2014 09:02:09 +0000 (UTC) Cc: fmatthew5876@gmail.com To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC54TLGKR4LBBFGWSSLAKGQETA7HP2A@isocpp.org Thu Jan 02 10:02:16 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pd0-f200.google.com ([209.85.192.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VyeAS-0005eZ-Av for gclcip-std-proposals@m.gmane.org; Thu, 02 Jan 2014 10:02:16 +0100 Original-Received: by mail-pd0-f200.google.com with SMTP id p10sf42086039pdj.7 for ; Thu, 02 Jan 2014 01:02:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:cc:message-id:in-reply-to:references:subject :mime-version:x-original-sender:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe:content-type; bh=m6Wt50qwIW/OyEzBi4PgrP3+jBPmZiPUoQ43wCburu4=; b=XAedAGYA+SuP27Ip/bcuXVk97lBC+rg+r6BF/5u9ChvMgJSzYnbFzIUizqo1cq8+O0 wQKUA4RI/MfJWgsoved1v+btE4GWHQftiQcf0p4OJL7jzTRaYjlUFEOmtq2LlbjU3zxZ H2Gab9Ee5YudxejvSWySqCFGl8sSJ11/iRiYdhXZeyaEy9MkyaZQPjDC+POZ44lyBrED JNYYUB3zVfrs3U5WurDHriZw5RAQnCMCtZ7QnugkmhRIOTpI4BfDhiBOykBtwsoPc7pt 61IqEyMCjL60IrX5zIhVf2ftWYF/6GWYIQ0PvC9NTw/vKL306X2EaiA5ZNhocjSpWkXK 2ecg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:cc:message-id:in-reply-to :references:subject:mime-version:x-original-sender:reply-to :precedence:mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=m6Wt50qwIW/OyEzBi4PgrP3+jBPmZiPUoQ43wCburu4=; b=aerucuMgdgMHOixN6ftSU3Xq+Ay4XfRvCfzN7p9lrV1jGN2FErPnev9Qf+EvbJd2Qq q0QSxOWWWpCoWS0aftLtU/fuU3rbaJXruAl5hovazaSUKObBG1CBJ+s2fn3HBdHqGQCf gspgbqCelKSLli/KmccGQtmvcPM88ajCIOoW/Upj+wXzp6iIqz0Qv3gV9Qqu77L8aVr8 ZHdGhZlcjIBtu167smugLpqEyog1OwVmsdLFe8UXIOgcFcOgcDT5xbeMoKXR6kJ3Dww5 lVM+cZ3L6DReUeBniOxjDk2Cja9Yxjup3nT2ApP0I/CX/Ro2CxQVPHJcNeI3Cnf5UICf sq2Q== X-Gm-Message-State: ALoCoQlizfQ/lgT6PboHBNxukMUWLrrYtCCQZc0/eHTzDg1sTAcVQ8I3LtMIeup47o/j9to/nATt X-Received: by 10.68.104.163 with SMTP id gf3mr32861798pbb.7.1388653333017; Thu, 02 Jan 2014 01:02:13 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.131.4 with SMTP id oi4ls4205594qeb.76.gmail; Thu, 02 Jan 2014 01:02:12 -0800 (PST) X-Received: by 10.49.95.8 with SMTP id dg8mr3484qeb.24.1388653332290; Thu, 02 Jan 2014 01:02:12 -0800 (PST) In-Reply-To: X-Original-Sender: evgeny.panasyuk@gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:8361 Archived-At: ------=_Part_7305_12351074.1388653331614 Content-Type: text/plain; charset=KOI8-R Content-Transfer-Encoding: quoted-printable 1 jan 2014 =C7., 5:42:54 UTC+4 fmatth...@gmail.com: > > Writing swap() is one of those boilerplate kinds of things that is usuall= y=20 > trivial but annoying (and error prone when you change data members but=20 > forget to update swap()). > [...] > Any reason this wouldn't make it as a proposal? > Compile time reflection is general solution for such kind of problems. It= =20 would help to remove boilerplate for swap, and for all other cases like=20 hash_value, operator<, operator=3D=3D, etc. I think we should get compile time reflection first - and check what kind= =20 of experience it provides. Here is example: http://coliru.stacked-crooked.com/a/1a1ae88f8b705f3d --=20 ---=20 You received this message because you are subscribed to the Google Groups "= ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposa= ls/. ------=_Part_7305_12351074.1388653331614 Content-Type: text/html; charset=KOI8-R Content-Transfer-Encoding: quoted-printable
1 jan 2014 =C7., 5:42:54 UTC+4 fmatth...@gmail.com:
Writing swap() = is one of those boilerplate kinds of things that is usually trivial but ann= oying (and error prone when you change data members but forget to update sw= ap()).
[...]
Any reason this wouldn't make it as a proposal?

Compile time reflection is general solution f= or such kind of problems. It would help to remove boilerplate for swap, and= for all other cases like hash_value, operator<, operator=3D=3D, etc.I think we should get compile time reflection first - and check what kind = of experience it provides.

Here is example: http://coliru.stacked-cr= ooked.com/a/1a1ae88f8b705f3d

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