220 20628 article Path: news.gmane.org!not-for-mail From: Ville Voutilainen Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Null -conditional and -coalescing operators Date: Tue, 22 Sep 2015 20:32:28 +0300 Lines: 31 Approved: news@gmane.org Message-ID: References: <4c3e2ee7-2159-4e93-a439-7d5c94c38c9c@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 1442943153 29279 80.91.229.3 (22 Sep 2015 17:32:33 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 22 Sep 2015 17:32:33 +0000 (UTC) To: "ISO C++ Standard - Future Proposals" Original-X-From: std-proposals+bncBC5JHI7A7ALRBLFBQ2YAKGQEZP7A4ZA@isocpp.org Tue Sep 22 19:32:32 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ob0-f199.google.com ([209.85.214.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZeRQd-0001xI-1H for gclcip-std-proposals@m.gmane.org; Tue, 22 Sep 2015 19:32:31 +0200 Original-Received: by obbbh8 with SMTP id bh8sf21683514obb.0 for ; Tue, 22 Sep 2015 10:32:29 -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=hBvXEe5FBWY8MNKj7l4UY9DfFnAsvI3zMnxuim0CtgY=; b=Qtuoawip7gZ+uBUtSxs8+UAFNN0sfJowYCLy4SeOTU7w7Ip8uxe9Un6KJSiV+ULtwr J8Oum2eKc8wEpJcgSHFSahMZncmsFZeY5rIa6tNd8woTkqAKFpxb5Pap6p0ddfvmFt3U kRHH/+OrYgxKGF848+JCjhRm6PEW3pSQg1m0mzeZHnaHo6nNheHtM0Uq/2wGAQuymgpA 2jp72GYQDoRD2MSdiHmc0zaDbQ4SuV64Mm1IbeRaLOxZtsMeTq0dYczUH9Wsx4dm8PB0 lRT6afYhAsUgB2eyjJvKYTiBolM43YlH9GomLD50FAIpRiz4RRdhiT8ptEtT46MnAU+z GGMw== X-Gm-Message-State: ALoCoQmgLl1rvzpLPNrWBM8PfS8NV84pmDeUASze71+l9LJuMxNvdLSaMoEGt3khNOilEftbq9BP X-Received: by 10.107.136.229 with SMTP id s98mr27677200ioi.34.1442943149874; Tue, 22 Sep 2015 10:32:29 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.20.214 with SMTP id 80ls3151234qgj.64.gmail; Tue, 22 Sep 2015 10:32:28 -0700 (PDT) X-Received: by 10.31.15.66 with SMTP id 63mr18956604vkp.147.1442943148587; Tue, 22 Sep 2015 10:32:28 -0700 (PDT) Original-Received: from mail-vk0-x22e.google.com (mail-vk0-x22e.google.com. [2607:f8b0:400c:c05::22e]) by mx.google.com with ESMTPS id l140si2147840vkd.81.2015.09.22.10.32.28 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 22 Sep 2015 10:32:28 -0700 (PDT) Received-SPF: pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400c:c05::22e as permitted sender) client-ip=2607:f8b0:400c:c05::22e; Original-Received: by vkhf67 with SMTP id f67so11371135vkh.1 for ; Tue, 22 Sep 2015 10:32:28 -0700 (PDT) X-Received: by 10.31.185.198 with SMTP id j189mr18415957vkf.34.1442943148406; Tue, 22 Sep 2015 10:32:28 -0700 (PDT) Original-Received: by 10.103.37.195 with HTTP; Tue, 22 Sep 2015 10:32:28 -0700 (PDT) In-Reply-To: <4c3e2ee7-2159-4e93-a439-7d5c94c38c9c@isocpp.org> X-Original-Sender: ville.voutilainen@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400c:c05::22e as permitted sender) smtp.mailfrom=ville.voutilainen@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:20628 Archived-At: On 22 September 2015 at 20:03, wrote: > Checking for null and then doing one thing is a common task. > null-conditional and null-coalescing operators would be a nice solution. > > For example, given the following pointer: > > unique_ptr connection; > > This may happen: > > if (connection) > { > connection->sendMessage(msg); > } > > A nice alternative would be: > > connection ?: connection->SendMessage(msg); This was proposed and rejected, see http://cplusplus.github.io/EWG/ewg-closed.html#138 -- --- 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/. .