220 12251 <519C2768-CE67-4C35-A4CA-9D71B6DF9B1F@gmail.com> article Path: news.gmane.org!not-for-mail From: David Krauss Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: std::num_get/put overloads Date: Wed, 13 Aug 2014 14:08:25 +0800 Lines: 73 Approved: news@gmane.org Message-ID: <519C2768-CE67-4C35-A4CA-9D71B6DF9B1F@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) Content-Type: multipart/alternative; boundary="Apple-Mail=_497C877C-8ED0-470D-9D8F-6E3453C2AA58" X-Trace: ger.gmane.org 1407910208 1143 80.91.229.3 (13 Aug 2014 06:10:08 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 13 Aug 2014 06:10:08 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCW25A7E3QCRBNUCVSPQKGQEIMY4UAA@isocpp.org Wed Aug 13 08:10:01 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-vc0-f197.google.com ([209.85.220.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XHRl1-00054L-Qm for gclcip-std-proposals@m.gmane.org; Wed, 13 Aug 2014 08:10:00 +0200 Original-Received: by mail-vc0-f197.google.com with SMTP id ij19sf31349134vcb.0 for ; Tue, 12 Aug 2014 23:09:59 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:subject:message-id:date:to:mime-version :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=vReT5pzuZWBAnQ1OlJ/AlF2ybs+Zv8+C1RI+5CXRJwA=; b=S9Ud6gui4cMLXI7/viu8E4QXF82cjtpFbgoVks/yl/DMwnyr59QyktKCIuMtrIWeD7 HKGmcvF5w6AAW9lOaU0A/QLzoJLlTo8yZMGcuuuAb2jx/y37lHDPiiYuSemZk1ihfxjA W0C+6t6UtW9nGtzeVs95O95pJSoef0R1qUu+B+qBAgrRIDASeyUubSK/lhFDTM0hhsuz 9rcz1/Ags32snVDsUlFLouV1r2CylSKvobwsIJrvOdN1V2GwCyqF5jL5gLukUr1lRaa6 vdUZW1iss/xgIoAiMimzE4Fdqw015FOGqEl3gKx1DQ1edZi9xqitpHBc8mOfVvjAcGO0 4lJg== X-Gm-Message-State: ALoCoQnu/E7Uq+2CV6duLqaHRFjJ+uvihqfMLbJYRzpLnn05diZOk1lwMF9lECLLwEIY6QZpIgct X-Received: by 10.236.2.162 with SMTP id 22mr901122yhf.41.1407910199057; Tue, 12 Aug 2014 23:09:59 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.43.135 with SMTP id w7ls3120515igl.21.canary; Tue, 12 Aug 2014 23:09:58 -0700 (PDT) X-Received: by 10.70.118.225 with SMTP id kp1mr2284319pdb.74.1407910198165; Tue, 12 Aug 2014 23:09:58 -0700 (PDT) Original-Received: from mail-pa0-x22f.google.com (mail-pa0-x22f.google.com [2607:f8b0:400e:c03::22f]) by mx.google.com with ESMTPS id gr3si713908pbb.170.2014.08.12.23.09.58 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 12 Aug 2014 23:09:58 -0700 (PDT) Received-SPF: pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:400e:c03::22f as permitted sender) client-ip=2607:f8b0:400e:c03::22f; Original-Received: by mail-pa0-f47.google.com with SMTP id kx10so14366108pab.34 for ; Tue, 12 Aug 2014 23:09:58 -0700 (PDT) X-Received: by 10.66.155.167 with SMTP id vx7mr690901pab.141.1407910197921; Tue, 12 Aug 2014 23:09:57 -0700 (PDT) Original-Received: from [172.20.10.2] ([121.54.54.150]) by mx.google.com with ESMTPSA id pl10sm862063pbb.56.2014.08.12.23.09.38 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 12 Aug 2014 23:09:57 -0700 (PDT) X-Mailer: Apple Mail (2.1878.6) X-Original-Sender: potswa@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:400e:c03::22f as permitted sender) smtp.mail=potswa@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:12251 Archived-At: --Apple-Mail=_497C877C-8ED0-470D-9D8F-6E3453C2AA58 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=ISO-8859-1 , and therefore , specifically provides for numeric I/O o= ver the set of standard, non-character integer types. __int128_t support or= std::int8_t would be a non-conforming extension. This is too strict. All i= nteger types should be supported. The functions which implement the parsing are virtual, but not pure virtual= , so there's no risk of making user-derived classes abstract. Implicit inte= ger conversions don't work due to overload ambiguity, so no user code alrea= dy passes arguments not covered by the existing overloads (e.g., char). It's true that user-derived classes would not be able to portably provide i= dentical coverage, and C locale behavior would surprisingly result from pas= sing an unsupported argument, but locale facet derivation is quite an unpop= ular paradigm. Is there anything else that could break? --=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/. --Apple-Mail=_497C877C-8ED0-470D-9D8F-6E3453C2AA58 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 <locale>, and therefore <iostream&g= t;, specifically provides for numeric I/O over the set of standard, = non-character integer types. __int128_t suppo= rt or std::int8_t would be a non-conforming e= xtension. This is too strict. All integer types should be supported.
The functions which implement the parsing are virtual, but not= pure virtual, so there’s no risk of making user-derived classes abst= ract. Implicit integer conversions don’t work due to overload ambigui= ty, so no user code already passes arguments not covered by the existing ov= erloads (e.g., char).

It’s true that user-derived classes would not be able to portably p= rovide identical coverage, and C locale behavior would surprisingly result = from passing an unsupported argument, but locale facet derivation is quite = an unpopular paradigm.

Is there anything else that= could break?

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