220 18696 <83C9452F-9B49-4A43-A8E5-EC98C3A1EDC2@gmail.com> article Path: news.gmane.org!not-for-mail From: David Krauss Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: if not (expression) like python Date: Sun, 21 Jun 2015 10:11:51 +0800 Lines: 102 Approved: news@gmane.org Message-ID: <83C9452F-9B49-4A43-A8E5-EC98C3A1EDC2@gmail.com> References: <51565265-ec78-4f6b-b684-64aed8fd9a57@isocpp.org> <558400A2.2040005@gmail.com> <8f64343f-e5b8-424a-83df-4385c46c5ef9@isocpp.org> <1464415.iy2aHB31Tl@tjmaciei-mobl4> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2098\)) Content-Type: multipart/alternative; boundary="Apple-Mail=_F332BDA5-1FC7-4583-B6A9-359CC6ECDA6E" X-Trace: ger.gmane.org 1434852731 3216 80.91.229.3 (21 Jun 2015 02:12:11 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 21 Jun 2015 02:12:11 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCW25A7E3QCRB4N2TCWAKGQEW3T462I@isocpp.org Sun Jun 21 04:12:06 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yh0-f72.google.com ([209.85.213.72]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Z6Ujq-0001Nl-JW for gclcip-std-proposals@m.gmane.org; Sun, 21 Jun 2015 04:12:02 +0200 Original-Received: by yhb65 with SMTP id 65sf132561284yhb.3 for ; Sat, 20 Jun 2015 19:12:01 -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:content-type:message-id:mime-version :subject:date:references:to: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=mJokqSJVo7nbDKN88b+xvW0xPESKlyKW0tDiUxG1wlI=; b=Zt/SlJIdalZxt8Jd/3tCw0KfyFdB93JahOmxAcLQfBJspEWwZ+jORImgH8/cvymDx/ RYp0X6zxxH2HOeeNL2KyBUuHRXDuPup2XOPM7GTfQjXpyiaNVSif3uDbmVE2uxTBybTg RMtPLT0UZ5e3fB/P+306CzmgbgdgOhNIoAVG0T9Kp+Cn7A43CaOHBCVSRom7yWFLDJle 5kTkxsVB8hRUoEAT5CENdDH4QjTfkctWibVoTzy1OxwEXiCghnDm7hfJjq4AD3jvs2Op RCV5A4s8ilPRKgrnRLm5MyPFNWNWg6T+VBUn7M2JiNNAbyu3XCvUgRJrUhgI1FpvKGEU ePeA== X-Gm-Message-State: ALoCoQkwDgWhwOFQ2fvR5FoXflnRks6uqsoCQ+ZgoZ7d30HPcWo79jIITP16xWSTCDy/T+lZb+Ix X-Received: by 10.129.55.216 with SMTP id e207mr30814653ywa.24.1434852721619; Sat, 20 Jun 2015 19:12:01 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.41.74 with SMTP id d10ls665960igl.28.gmail; Sat, 20 Jun 2015 19:12:00 -0700 (PDT) X-Received: by 10.70.40.131 with SMTP id x3mr45658161pdk.83.1434852720860; Sat, 20 Jun 2015 19:12:00 -0700 (PDT) Original-Received: from mail-pd0-x231.google.com (mail-pd0-x231.google.com. [2607:f8b0:400e:c02::231]) by mx.google.com with ESMTPS id hl3si23307576pdb.148.2015.06.20.19.12.00 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 20 Jun 2015 19:12:00 -0700 (PDT) Received-SPF: pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:400e:c02::231 as permitted sender) client-ip=2607:f8b0:400e:c02::231; Original-Received: by pdbki1 with SMTP id ki1so115507155pdb.1 for ; Sat, 20 Jun 2015 19:12:00 -0700 (PDT) X-Received: by 10.66.142.42 with SMTP id rt10mr45557196pab.142.1434852720748; Sat, 20 Jun 2015 19:12:00 -0700 (PDT) Original-Received: from [172.20.10.2] ([121.54.44.95]) by mx.google.com with ESMTPSA id sn7sm15507346pac.5.2015.06.20.19.11.57 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sat, 20 Jun 2015 19:11:59 -0700 (PDT) In-Reply-To: X-Mailer: Apple Mail (2.2098) 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:c02::231 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-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:18696 Archived-At: --Apple-Mail=_F332BDA5-1FC7-4583-B6A9-359CC6ECDA6E Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 > On 2015=E2=80=9306=E2=80=9320, at 2:15 AM, Matthew Woehlke wrote: >=20 > I doubt these are used enough to be worth bothering, or I'd be tempted > to add: Supposedly they=E2=80=99re useful to programmers without certain characters= in their keyboard layouts. They are essentially inherited from C . If the alternative spellings were used as intended in C++, such code wou= ld be written with rvalue references declared by =E2=80=9Cand,=E2=80=9D lva= lue references by =E2=80=9Cbitand,=E2=80=9D and destructors by =E2=80=9Ccom= pl.=E2=80=9D They=E2=80=99re cute, but not a serious alternative style. As for parity with Python, note that the ! operator has high syntactic prec= edence, so you need to parenthesize the expression unless it=E2=80=99s more= than e.g. a simple identifier or function call. Negated if expressions wer= e proposed in Urbana (IIRC) and there was little interest. --=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=_F332BDA5-1FC7-4583-B6A9-359CC6ECDA6E Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=UTF-8
On 2015=E2=80=9306= =E2=80=9320, at 2:15 AM, Matthew Woehlke <mwoehlke.floss@gmail.com> wrote:

I doubt these are used= enough to be worth bothering, or I'd be tempted
to add:

Supposedly they=E2=80=99re use= ful to programmers without certain characters in their keyboard layouts. Th= ey are essentially inherited from C <i= so646.h>. If the alternative spellings were used as intended= in C++, such code would be written with rvalue references declared by =E2= =80=9Cand,=E2=80=9D lvalue referen= ces by =E2=80=9Cbitand,=E2=80=9D a= nd destructors by =E2=80=9Ccompl.= =E2=80=9D

They=E2= =80=99re cute, but not a serious alternative style.
As for parity with Python, note that the= ! operator has high syntactic pre= cedence, so you need to parenthesize the expression unless it=E2=80=99s mor= e than e.g. a simple identifier or function call. Negated if expressions were proposed in Urbana (IIRC) = and there was little interest.

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Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/<= /a>.
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