220 19886 article Path: news.gmane.org!not-for-mail From: Andrey Semashev Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: default arguments Date: Tue, 18 Aug 2015 13:39:21 +0300 Lines: 45 Approved: news@gmane.org Message-ID: References: <1e7b94e7-364a-419d-9b12-6706ddef0fef@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1439894365 553 80.91.229.3 (18 Aug 2015 10:39:25 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 18 Aug 2015 10:39:25 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCXY5TXHWYJRBWUWZSXAKGQEUKUV5JI@isocpp.org Tue Aug 18 12:39:25 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ig0-f200.google.com ([209.85.213.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZReId-0006Lj-Kg for gclcip-std-proposals@m.gmane.org; Tue, 18 Aug 2015 12:39:23 +0200 Original-Received: by igbjg10 with SMTP id jg10sf173983922igb.0 for ; Tue, 18 Aug 2015 03:39:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type:content-transfer-encoding :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:x-spam-checked-in-group:list-post :list-help:list-archive:list-subscribe:list-unsubscribe; bh=YUXTi70b+nwPmIT7RrFwrjM3YHeL7SZYWxZKvSSQi1E=; b=OX+tQ6SYMo7qsHw0NF4V07qoWAnVjdGkdw/qRCp/2HX6b2sVNmcn0yfUY3JeTS/OxT BjmRg7l+7dsRELrGfYYU6EPUzNNCJPgG+zHujuS1F66/9gdelTAxhSfhi1/JpM4b0uT7 +7GhyMHDiV6GO2WFeSgFPe44o+BVIx70hY48FLMojQUg2Hzif4Ng7OTYthhMLQbbNTR+ J3ScUvRFcQHKqosDripXY7mSWrzs6h+se/J4EBCanB9i+O22wp5EHDkNQZk7rwqV524q nyIVxUG+HeLS0NS6ArzRCszK4nwIxKWngH7UgUbrESgY1VU84vOfs02P6MYdKhbpAhFR X-Gm-Message-State: ALoCoQlCEwsY87wZIkgxt8AbyXVbSaB60mjFwxKcDbGWxEnuzWxzn7ftpvMPRU0c+ZbER8g+hxYl X-Received: by 10.182.85.197 with SMTP id j5mr5027268obz.23.1439894362390; Tue, 18 Aug 2015 03:39:22 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.122.106 with SMTP id lr10ls1307849igb.9.gmail; Tue, 18 Aug 2015 03:39:21 -0700 (PDT) X-Received: by 10.50.36.7 with SMTP id m7mr5700790igj.96.1439894361824; Tue, 18 Aug 2015 03:39:21 -0700 (PDT) Original-Received: from mail-ig0-x231.google.com (mail-ig0-x231.google.com. [2607:f8b0:4001:c05::231]) by mx.google.com with ESMTPS id 80si11899003iol.73.2015.08.18.03.39.21 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 18 Aug 2015 03:39:21 -0700 (PDT) Received-SPF: pass (google.com: domain of andrey.semashev@gmail.com designates 2607:f8b0:4001:c05::231 as permitted sender) client-ip=2607:f8b0:4001:c05::231; Original-Received: by igui7 with SMTP id i7so78990918igu.1 for ; Tue, 18 Aug 2015 03:39:21 -0700 (PDT) X-Received: by 10.50.97.71 with SMTP id dy7mr22040943igb.76.1439894361690; Tue, 18 Aug 2015 03:39:21 -0700 (PDT) Original-Received: by 10.79.98.1 with HTTP; Tue, 18 Aug 2015 03:39:21 -0700 (PDT) In-Reply-To: X-Original-Sender: andrey.semashev@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of andrey.semashev@gmail.com designates 2607:f8b0:4001:c05::231 as permitted sender) smtp.mailfrom=andrey.semashev@gmail.com; dkim=pass header.i=@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org 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:19886 Archived-At: On Tue, Aug 18, 2015 at 1:25 PM, David Rodr=C3=ADguez Ibeas wrote: > > > On Tue, Aug 18, 2015 at 11:22 AM, Arthur Tchaikovsky > wrote: >> >> I gotta be honest with you Johann, I simply don't buy it. >> And index notion looks anything but elegant solution. That is my opinion >> of course. >> > > You might not find it elegant, but it is a feature that has been present= in > C for some time (to initialize objects) so there is prior art. It is also > tested and the shortcomings are known --at least for initialization, whic= h > is not really the same as defaulting arguments to functions or constructo= rs. Structure members have stable names, function parameters do not and in fact may have no names. I do find Boost.Parameter named parameters useful sometimes, but with the existing rules defined by the standard wrt function declarations I really doubt the named function arguments will appear in the language as easily as you suggest. I would find named member initializations for structs extremely useful though, as I constantly find myself worrying that braced initialization will get screwed when the order of the struct members changes. About the original proposal (i.e. the use of the 'default' keyword to designate default argument values), I like it. Not that I often need something like that but sometimes that would be useful, at least to decouple the interface from the user. --=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/. .