220 18583 article Path: news.gmane.org!not-for-mail From: Olaf van der Spek Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Parsing Numbers Date: Fri, 12 Jun 2015 19:14:14 +0200 Lines: 61 Approved: news@gmane.org Message-ID: References: <8c6a8503-3958-4244-9d0f-33b567250056@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 1434129258 26378 80.91.229.3 (12 Jun 2015 17:14:18 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 12 Jun 2015 17:14:18 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC5NB45SSABBBZ5G5SVQKGQEJQWMPVQ@isocpp.org Fri Jun 12 19:14:18 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wg0-f69.google.com ([74.125.82.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Z3SX3-0005Gn-6u for gclcip-std-proposals@m.gmane.org; Fri, 12 Jun 2015 19:14:17 +0200 Original-Received: by wgez8 with SMTP id z8sf10868942wge.2 for ; Fri, 12 Jun 2015 10:14:16 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type: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=Ioaa2gTi/vM9GOT42avcHBpoeT+aFd+okuO53cSCQAs=; b=czcSKS3mWpcDjZwVWGXkysauNSZNcFPFtknYOGBs8UyLTyzcnwa8UTB5ny4L/bD8O4 EWqiwqyRUS2f6wlk6HiD+r8LlIOHF8s8dxVXjfVOVMLlyPuR/0/c5BkJrtPrGZUC9Aky 2GhsG/TqIRILMw/4zJAPkcLjoEORSUV2PNfLisjLwYoPf6eoNFe2qk5A2TcU/09KJriI PAw8Wns1Yxnn/vkhtVujgGleZphTzhA8pMdIRiyn8Nu+EwUI1u3T45DnE6n71P3yTn/a Jct04S4INi7kX5SAxwBcos+v5qD60mtG3cekYWp+hRnaRm2i9apQ1r/WGgro3bAZq5U4 cxRA== X-Gm-Message-State: ALoCoQlsnqPIfx/QuBRH8M6qpJFDP5r0W23fJqdHCDsreXCdIHodl3aJKlT03Mb2TPDL0ssOmA0A X-Received: by 10.194.158.134 with SMTP id wu6mr15250222wjb.6.1434129256602; Fri, 12 Jun 2015 10:14:16 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.94.69 with SMTP id da5ls217683wib.8.canary; Fri, 12 Jun 2015 10:14:15 -0700 (PDT) X-Received: by 10.180.87.199 with SMTP id ba7mr8975474wib.81.1434129255071; Fri, 12 Jun 2015 10:14:15 -0700 (PDT) Original-Received: from mail-wi0-x22a.google.com (mail-wi0-x22a.google.com. [2a00:1450:400c:c05::22a]) by mx.google.com with ESMTPS id ht6si4424552wib.102.2015.06.12.10.14.15 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 12 Jun 2015 10:14:15 -0700 (PDT) Received-SPF: pass (google.com: domain of olafvdspek@gmail.com designates 2a00:1450:400c:c05::22a as permitted sender) client-ip=2a00:1450:400c:c05::22a; Original-Received: by wifx6 with SMTP id x6so22927019wif.0 for ; Fri, 12 Jun 2015 10:14:14 -0700 (PDT) X-Received: by 10.180.109.111 with SMTP id hr15mr8932320wib.53.1434129254585; Fri, 12 Jun 2015 10:14:14 -0700 (PDT) Original-Received: by 10.28.48.18 with HTTP; Fri, 12 Jun 2015 10:14:14 -0700 (PDT) In-Reply-To: <8c6a8503-3958-4244-9d0f-33b567250056@isocpp.org> X-Original-Sender: olafvdspek@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of olafvdspek@gmail.com designates 2a00:1450:400c:c05::22a as permitted sender) smtp.mail=olafvdspek@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-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:18583 Archived-At: 2015-06-12 17:49 GMT+02:00 Matthew Fioravante : > > > On Friday, June 12, 2015 at 9:51:55 AM UTC-4, Olaf van der Spek wrote: >> >> Some more Qs: >> Should (unsigned) short be supported? >> >> Should (unsigned) char be supported? > > > I would support all integral types. I also believe unsigned types should be > supported because if you really want that high order bit without triggering > an overflow error you can't use a signed type. Of course > I would also make it an error > to try to specify a negative literal (i.e. '-' prefix) if T is unsigned > integral. What about "-0"? "+1"? >> >> Bool? > > > This is tricky because valid strings could be (0, 1), (true, false), (True, > False), (T,F), etc.... If the parsing function is named something like > str_to_num() then it makes sense to support bool with "0" and "1". If its > more generic like parse(), then the question of valid inputs becomes more > ambiguous. True There's also the question of what to do with for example -1 and 2. Map to true or return invalid input? >> Should octal input be supported if base = 0? > > > I would at minimum support all of the literals supported by the core > language string literals. That is, hex (0x), decimal (), octal (0), and > binary (0b). Does strtol support 0b? 0 as prefix is problematic as 09 for example is probably not intended as an octal number. -- Olaf -- --- 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/. .