220 23742 article Path: news.gmane.org!not-for-mail From: Matthew Woehlke Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Default tuple-like access Date: Fri, 15 Jan 2016 11:47:28 -0500 Lines: 36 Approved: news@gmane.org Message-ID: References: <569583AD.9050208@wanadoo.fr> <5697E783.2020509@wanadoo.fr> <20160114221625.4931665.26873.3290@gmail.com> <20160115161833.28475478.30124.3317@gmail.com> 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 1452876488 32198 80.91.229.3 (15 Jan 2016 16:48:08 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 15 Jan 2016 16:48:08 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC37LBFWUIFBBNWF4S2AKGQE26ZSZ6A@isocpp.org Fri Jan 15 17:47:58 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lf0-f69.google.com ([209.85.215.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aK7XU-0007gt-Dg for gclcip-std-proposals@m.gmane.org; Fri, 15 Jan 2016 17:47:52 +0100 Original-Received: by mail-lf0-f69.google.com with SMTP id k69sf65640081lfg.3 for ; Fri, 15 Jan 2016 08:47:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=to:from:subject:date:lines:message-id:references:mime-version :content-type:content-transfer-encoding:user-agent:in-reply-to :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=ZGoqWzaDL0b14FWSJfpWSt+Pj59lvTfdhyFaKINZWrM=; b=uxxDRysySdRUzWQb1HooHf+AGf9vSSRQ2JG2+vQbxLE2EPMyG+rYSmMO12dc+XC4z6 yf0mpv+F5T2KugHIvXspRPzML7DlaFFJgT7ibmfDEAR1rknMNIStVxZfXnKfbfUVLJkX B89OG812BlNDJHQIi1F99zR4coLqvywpXGa5RMdHVogX4OB5mtx7P3/ggr1T9EDu+hw5 hkHeazB7bFNbsvkgA6/pcWgJQ6vV54mqQmOffXZqHoBKJYVnLM8fW74RmXU00dguzdeq qa7LqTsKuzN7u81v6udgA0rdCXowmkrX/7RTCqegkmgQpzw51g0rEr8 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:to:from:subject:date:lines:message-id:references :mime-version:content-type:content-transfer-encoding:user-agent :in-reply-to: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=ZGoqWzaDL0b14FWSJfpWSt+Pj59lvTfdhyFaKINZWrM=; b=lanVwvO0ump0jXQoJPTmC3CncpT3sq3bSF5/d7WZ9/v9EYKK0qySc5vepnRFBvvaMj TfFqUgX8EPHEDQpLIby1oIBLMaGcG7MGyQREK1mbPH2hKmXW54KN1bq1xOeHPrGB3Bs/ KJi4CVZtp8EB8tU3RFR8OlOYRtfndOvQNJuYabvcqylz83kUceejFc+/68AdtoVxZv3z xrrIcQPBHbXrKc7yF4H04UCYnk2QhCq8hkhPVQ9qym75BXBw7CKC0NY+q/Xd3iAlbahM CLyT2Bx+udej+TfpjYBxGysPHIcA5t45PTCz4iYfC5+UbwhmpBB X-Gm-Message-State: ALoCoQlDbH5UgAAbxhGu720xyCGNS9LqRlxvgXTw9FMQMlp8eL5qk+CsTLBjMmdHSXxI3imFIRPz6Hm75eD1JOphdozyCNo02A== X-Received: by 10.25.131.150 with SMTP id f144mr1325400lfd.6.1452876471838; Fri, 15 Jan 2016 08:47:51 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.25.144.140 with SMTP id s134ls240386lfd.91.gmail; Fri, 15 Jan 2016 08:47:50 -0800 (PST) X-Received: by 10.112.139.164 with SMTP id qz4mr3569571lbb.41.1452876469984; Fri, 15 Jan 2016 08:47:49 -0800 (PST) Original-Received: from plane.gmane.org (plane.gmane.org. [80.91.229.3]) by mx.google.com with ESMTPS id ue7si6118868lbc.83.2016.01.15.08.47.49 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 15 Jan 2016 08:47:49 -0800 (PST) Received-SPF: pass (google.com: domain of gclcip-std-proposals@m.gmane.org designates 80.91.229.3 as permitted sender) client-ip=80.91.229.3; Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1aK7XE-0007Tb-Gi for std-proposals@isocpp.org; Fri, 15 Jan 2016 17:47:36 +0100 Original-Received: from tripoint.kitware.com ([66.194.253.20]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 15 Jan 2016 17:47:36 +0100 Original-Received: from mwoehlke.floss by tripoint.kitware.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 15 Jan 2016 17:47:36 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 22 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: tripoint.kitware.com User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 In-Reply-To: <20160115161833.28475478.30124.3317@gmail.com> X-Original-Sender: mwoehlke.floss@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of gclcip-std-proposals@m.gmane.org designates 80.91.229.3 as permitted sender) smtp.mailfrom=gclcip-std-proposals@m.gmane.org; dmarc=fail (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:23742 Archived-At: On 2016-01-15 11:18, Tony V E wrote: > Yes I understand nothing precludes it. I wonder if there is value in=20 > it. Whether it has value might sway which way I'd like to see things > implemented. >=20 > For example, if it had value, then *always* (ie mandating)=20 > calculating size from get would be bad. =E2=80=8EOn the other hand, if we= =20 > want to prevent that craziness, maybe we should mandate it. IMHO *always* calculating is bad for reasons that Vicente already gave :-). Ergo, I don't think we should mandate that. Perhaps we could somehow enforce that get(T) (N =3D=3D tuple_size()) must work an= d get(T) must not, but that seems complicated and excessive. I feel like in this case it's sufficient to say "don't do that" if it would break things. As to whether or not it's interesting to have get(T) work for one or more values of N > tuple_size(), I'm not strongly opinionated. It doesn't sound inherently crazy to me, FWIW. --=20 Matthew --=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 https://groups.google.com/a/isocpp.org/group/std-propos= als/. .