220 13973 <346c989f-5000-450c-ae9e-ccd2fb22f1ee@isocpp.org> article Path: news.gmane.org!not-for-mail From: Sean Middleditch Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Default values for n4191 fold expressions Date: Fri, 17 Oct 2014 00:12:55 -0700 (PDT) Lines: 67 Approved: news@gmane.org Message-ID: <346c989f-5000-450c-ae9e-ccd2fb22f1ee@isocpp.org> References: <997390c5-072b-407a-bce9-22a29fc5e228@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_634_147595737.1413529975909" X-Trace: ger.gmane.org 1413529986 28844 80.91.229.3 (17 Oct 2014 07:13:06 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 17 Oct 2014 07:13:06 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCDODCNR2QPRB6MCQORAKGQE2MSICRY@isocpp.org Fri Oct 17 09:12:59 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-vc0-f199.google.com ([209.85.220.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Xf1ic-0002Ed-Ci for gclcip-std-proposals@m.gmane.org; Fri, 17 Oct 2014 09:12:58 +0200 Original-Received: by mail-vc0-f199.google.com with SMTP id le20sf494403vcb.2 for ; Fri, 17 Oct 2014 00:12:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to: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=1bPSxAA1i6MDyBkFrElD594fI6iQm4kQnwtnOxYAFGE=; b=QMh52uGli2e2ImOChzxjAiFQkbP6ByFTrEsvz3VmsTFbmWufieyfqjGmVvp38GY31I eJ9aaaklYoByQTZnkxdQZmadiiZajX9ZRZP77+SHePRhHTJ99lFmbZZNh4zMFckTP0Lh 8Mo0P05T7fftp61V9pa6ZwMTTWQbGZs7xtLszpDe6RQOTfID6g/DLkCF1hbdF4dPGjjQ SwN9PR7Vj8NytO8GtxyG44vvD+ywO5eESBfSyjxHaWYm1589G9uU3GaAHQxhg43X0LWQ /uw45TJ7QjvJ/N4g0RAI9U5tBqiRnE1UiigHQ05jL0J4Q3RP70/4Uz7DPNlYOea5lDmU qp5w== 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: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=1bPSxAA1i6MDyBkFrElD594fI6iQm4kQnwtnOxYAFGE=; b=ZS+ZF6V4LCPPs4QlZqCG4P9f4X19MmQDzK2YQKw4RbqzXoV0dzyLQulYVrbEKxGCiq ZUo/QoN7x4qztiakQQ9I3x1Z0I68ypJPnRZJ6sQm7ulmrQjxC99InCpzOA60ON2grYTn PgIaXYoG8rExAXhFZWBm//jMzFtWc6ijDZ21Tkr8vIUE2/n42MAbqo8Xj2BXgJWRj8lJ mwCrYqFAcTgriuQ7Tsn7LeNf0X3IsqF0gXtNi7aqM+wkpEeyBijhkM4s/SA7SEy+IuZ3 EAyq5Eq1mCotK08oXdhY7GwOtTULWlzumiiEfswjCnF04vZK2AFdeAAwTHW4cBlgCPEt V4xA== X-Gm-Message-State: ALoCoQmxPKY7iHCEIbwYBHZTEmRuMJAmmDuaaswIA1nk1r2htM7dzyZOLzcD5CeHH7elL2pTY2CL X-Received: by 10.236.39.9 with SMTP id c9mr4624292yhb.41.1413529977578; Fri, 17 Oct 2014 00:12:57 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.18.163 with SMTP id 35ls798012ios.91.gmail; Fri, 17 Oct 2014 00:12:57 -0700 (PDT) X-Received: by 10.50.20.198 with SMTP id p6mr391721ige.10.1413529976989; Fri, 17 Oct 2014 00:12:56 -0700 (PDT) In-Reply-To: X-Original-Sender: Sean.Middleditch@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:13973 Archived-At: ------=_Part_634_147595737.1413529975909 Content-Type: text/plain; charset=UTF-8 On Wednesday, October 15, 2014 7:22:47 PM UTC-7, Richard Smith wrote: > > while if it is a prvalue int this gives a string of length 1 containing a >> nul character. > > > Yes, there's some risk this might happen accidentally. (If you anticipate > the problem, you can write "auto s = (to_string(args) + ... + > std::string());".) But it seems like a mistake that std::string implicitly > converts from an int in a surprising way, and fixing that might be a better > approach for this particular problem. > Can it be fixed without breaking user code? > -- --- 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/. ------=_Part_634_147595737.1413529975909 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On Wednesday, October 15, 2014 7:22:47 PM UTC-7, Richard S= mith wrote:
while if it is a prvalue int= this gives a string of length 1 containing a nul character.

Yes, there's some risk this might happen accidentally. (I= f you anticipate the problem, you can write "auto s =3D (to_string(args) + = .... + std::string());".) But it seems like a mistake that std::string impli= citly converts from an int in a surprising way, and fixing that might be a = better approach for this particular problem.

Can it be fixed without breaking user code?
=

--

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