220 23854 article Path: news.gmane.org!not-for-mail From: Matthew Woehlke Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: RFC: Unpacking tuples to value sequences Date: Tue, 19 Jan 2016 12:10:45 -0500 Lines: 47 Approved: news@gmane.org Message-ID: References: <6f3ece34-e302-4d95-afd0-4c1924e8a780@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 X-Trace: ger.gmane.org 1453223473 3007 80.91.229.3 (19 Jan 2016 17:11:13 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 19 Jan 2016 17:11:13 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC37LBFWUIFBBJW47G2AKGQEZIKTGFI@isocpp.org Tue Jan 19 18:11:04 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lb0-f197.google.com ([209.85.217.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aLZo7-0000Du-2d for gclcip-std-proposals@m.gmane.org; Tue, 19 Jan 2016 18:11:03 +0100 Original-Received: by mail-lb0-f197.google.com with SMTP id p10sf66499028lbo.0 for ; Tue, 19 Jan 2016 09:11:02 -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: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=PfoZfkjWTt3JEVb6qCkSvOb4cVq44QIdK1/bpMRZ7bM=; b=Hw1Xle1LOFCilYzQta34busRzwFtIigeNK+EO6eE93U99jKPhyn35jN4HsJMiEbhua D5Yyoma4EWu1gttDFMLhOne6bQeQZavwWLG/HyTFhuY+B9P4NWY4dOTvMk231kKsQCxJ fhaWNEwsrWydbT+atNpayxvriZy6vtyj3apMkcP4hAU4Up38oNVQwaUjjo28uykpw1c9 AmDw1qmBbOGzPXcfTBgJfd6e66ynqd2IUa6q9VyX9kzhcjnQTU7ubOt0xRAqlWhlybBi Q1aZ0gVK8YTREkUC5cW4WzMmg6bn2OPSvow7KhB5cFwMwvOhO1LJfQBLb63hxAO/jXRG RnV 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: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=PfoZfkjWTt3JEVb6qCkSvOb4cVq44QIdK1/bpMRZ7bM=; b=gB2dz0aOmqa+UWLfiQmzaBkZ53a7jYiWuSWaDqm97qtkBiMar4EfI61Hb7fE/fzVN8 j0VkvZbpY7UC8FhkPPnBn1KHGn/f1pCGnYb/4zPVcjdeg1YluvZCyY7FQMefFxhxF1eX 2/xj8ZOIDU30r2kJHEIaQ57MotaNE3aIjraxFrMJb1Zxs/R4ZPtexpgBgy6Q1QmS/Jmy ShOdyldw3NU4gZ7Kkvc9CIhUzs9pXkft/EQ1HjZqbrLLVWNDZX4QAVWGYgdqvW9Leo2D hl3HCpKs+4DRaiO33JqM49yb4Z43FA9kvVhQg1C8vPCdVFdmExNur9ksUpHsVflg4FOA X-Gm-Message-State: AG10YOQXgPUkqJ1ZZhAiWHgMs8uDSh9T5UK6Oz6I4BuPN9XdPDraLPYgGEsiPlsZ0J2iLQ== X-Received: by 10.112.181.97 with SMTP id dv1mr2889981lbc.16.1453223462727; Tue, 19 Jan 2016 09:11:02 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.25.23.160 with SMTP id 32ls626488lfx.63.gmail; Tue, 19 Jan 2016 09:11:01 -0800 (PST) X-Received: by 10.25.21.106 with SMTP id l103mr10975456lfi.92.1453223461293; Tue, 19 Jan 2016 09:11:01 -0800 (PST) Original-Received: from plane.gmane.org (plane.gmane.org. [80.91.229.3]) by mx.google.com with ESMTPS id 24si15239556lfv.62.2016.01.19.09.11.01 for (version=TLS1 cipher=AES128-SHA bits=128/128); Tue, 19 Jan 2016 09:11:01 -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 1aLZo3-0000Ck-At for std-proposals@isocpp.org; Tue, 19 Jan 2016 18:10:59 +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 ; Tue, 19 Jan 2016 18:10:59 +0100 Original-Received: from mwoehlke.floss by tripoint.kitware.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 19 Jan 2016 18:10:59 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 38 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: 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:23854 Archived-At: On 2016-01-19 11:44, Nicol Bolas wrote: > On Tuesday, January 19, 2016 at 11:31:31 AM UTC-5, Matthew Woehlke wrote: >> On 2016-01-19 10:40, Nicol Bolas wrote: >>> auto ...thing1 = func([*]f, [*]g)...; >> >> I alluded to this in my other reply, but I think it bears repeating... >> what does this (RHS) mean? >> >> - { func(f<0>, g<0>), func(f<1>, g<1>) } >> - { func(f<0>, f<1>, g<0>), func(f<0>, f<1>, g<1>) } >> - { func(f<0>, g<0>, g<1>), func(f<1>, g<0>, g<1>) } >> - func(f<0>, f<1>, g<0>, g<1>) >> >> I could legitimately want *any* of those. > > And my syntax can provide *all* of them: > > func([*]f, [*]g)...; > func([*]f..., [*]g)...; > func([*]f, [*]g...)...; > func([*]f..., [*]g...); Why do I have to unpack it *twice*? Ugh... > [...] lots and lots of heinous syntax. I find your proposal much too complicated and severely lacking in rationale why we need such as a *language* feature. (I have yet to see you offer a rationale, besides "hey, wouldn't it be great if...".) As such, I cannot support it in good conscience, and so I will reiterate my earlier comment: If you feel strongly, I recommend that you write and present a competing paper. Unless you can provide a better justification, at this time I intend to continue with my version in its current form. -- Matthew -- --- 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 https://groups.google.com/a/isocpp.org/group/std-proposals/. .