220 7264 article Path: news.gmane.org!not-for-mail From: Philipp Stephani Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Named arguments proposal Date: Sat, 12 Oct 2013 18:04:36 +0200 Lines: 91 Approved: news@gmane.org Message-ID: References: <74166da9-20f4-49b0-a9e6-47bf5be92e35@isocpp.org> <6ba6b273-76df-4037-9851-4a2ab98f0b68@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a11c3675e42333704e88d648d X-Trace: ger.gmane.org 1381593875 13937 80.91.229.3 (12 Oct 2013 16:04:35 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 12 Oct 2013 16:04:35 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBD35NAXJW4GBBFPG4WJAKGQELVZXHCY@isocpp.org Sat Oct 12 18:04:40 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wg0-f70.google.com ([74.125.82.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VV1gE-0005ca-T0 for gclcip-std-proposals@m.gmane.org; Sat, 12 Oct 2013 18:04:38 +0200 Original-Received: by mail-wg0-f70.google.com with SMTP id m15sf9574234wgh.9 for ; Sat, 12 Oct 2013 09:04:38 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=kHn+wLamPJPc5cZQC+n6fDFENZkayxc7DKa5auALwe8=; b=VX70Ulc2vPFcAvFIK7ngwg7XnsPv5AF2u2+vw8QzowVxPBi8/9cnwKinvsrgF0kZT/ 4jwwTZtZbkwqBuDkrs66wG8/KdNz7IyJ6P+C8CvwpeuGRVcPcoXney1rBdISXtwgc4FD /HJdvVLTY/ezy5RAZ+4OcSHVS6Ze4ZevFHy83IfBOtqH8GPF793AnZSNhogfpara2l6k sIoIyukIgTdxUcXhSPlKDdPzunSl5HvMesXJhOs5ZYDo/EuI7OT66RK2O+ACy+cncs07 wBhA2+jkiGJ2/u3ACNOLRS/clCmCgEGKN0O8pWB1l8WtvukqUpqojNwI8N3FlbYUhseK Zjiw== X-Received: by 10.112.11.20 with SMTP id m20mr8940705lbb.4.1381593878250; Sat, 12 Oct 2013 09:04:38 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.19.34 with SMTP id b2ls431837wie.2.canary; Sat, 12 Oct 2013 09:04:37 -0700 (PDT) X-Received: by 10.204.247.71 with SMTP id mb7mr22534135bkb.7.1381593877359; Sat, 12 Oct 2013 09:04:37 -0700 (PDT) Original-Received: from mail-lb0-x235.google.com (mail-lb0-x235.google.com [2a00:1450:4010:c04::235]) by mx.google.com with ESMTPS id cr5si8749359bkc.234.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sat, 12 Oct 2013 09:04:37 -0700 (PDT) Received-SPF: pass (google.com: domain of p.stephani2@gmail.com designates 2a00:1450:4010:c04::235 as permitted sender) client-ip=2a00:1450:4010:c04::235; Original-Received: by mail-lb0-f181.google.com with SMTP id u14so4317086lbd.26 for ; Sat, 12 Oct 2013 09:04:37 -0700 (PDT) X-Received: by 10.152.116.109 with SMTP id jv13mr2389577lab.30.1381593876934; Sat, 12 Oct 2013 09:04:36 -0700 (PDT) Original-Received: by 10.112.213.73 with HTTP; Sat, 12 Oct 2013 09:04:36 -0700 (PDT) In-Reply-To: X-Original-Sender: p.stephani2@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of p.stephani2@gmail.com designates 2a00:1450:4010:c04::235 as permitted sender) smtp.mail=p.stephani2@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-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:7264 Archived-At: --001a11c3675e42333704e88d648d Content-Type: text/plain; charset=ISO-8859-1 2013/10/8 Zhihao Yuan > On Tue, Oct 8, 2013 at 4:26 PM, Philipp Stephani > wrote: > > Often a dedicated options type (e.g. a namedtuple) is better > > than a large number of keyword arguments. > > Lua uses this approach. And they even has a syntax > sugar to use func{ } call instead of > func({
}). I'm not particularly in favor of this; > sometimes a language extension makes things cleaner. > (And we don't have such convenient struct in C++ I guess). > > Not yet, we would at least have to adopt C's named initializers: f(a, {.b = 1, .c = 2}) Then we could think of allowing leaving out the outer braces: f(a, .b = 1, .c = 2) For other uses, we can adopt C# and VB's feature of auto-generating anonymous record types: f(a, new {.b = 1, .c = 2}) // creates a new struct type Lots of things are still possible with only syntactic sugar and without modifying the type system in complex ways. -- --- 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 email 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-proposals/. --001a11c3675e42333704e88d648d Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable



2013/10/8 Zhihao Yuan <zy@miator.net>
On Tue, Oct 8, 2013 at 4:26 PM, Philipp Stephani <p.stephani2@gmail.com> wrote: > Often a dedicated options type (e.g. a namedtuple) is better
> than a large number of keyword arguments.

Lua uses this approach. =A0And they even has a syntax
sugar to use func{ <table> } call instead of
func({ <table> }). =A0I'm not particularly in favor of this;
sometimes a language extension makes things cleaner.
(And we don't have such convenient struct in C++ I guess).

<= br>
Not yet, we would at least have to adopt C's named initia= lizers:

f(a, {.b =3D 1, .c =3D 2})

<= /div>
Then we could think of allowing leaving out the outer braces:

f(a, .b =3D 1, .c =3D 2)

For othe= r uses, we can adopt C# and VB's feature of auto-generating anonymous r= ecord types:

f(a, new {.b =3D 1, .c =3D 2}) =A0// creates a new stru= ct type

Lots of things are still possible with onl= y syntactic sugar and without modifying the type system in complex ways.

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