220 15411 <54A3F4C5.5020007@mail1.stofanet.dk> article Path: news.gmane.org!not-for-mail From: Bjorn Reese Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Isn't it time we had the bool std::[container]::contains() family of methods? Date: Wed, 31 Dec 2014 14:06:13 +0100 Lines: 20 Approved: news@gmane.org Message-ID: <54A3F4C5.5020007@mail1.stofanet.dk> References: <0959f2f8-acdd-4786-b6f3-0f05c62dcee6@isocpp.org> <3990670.unDteUsXEa@tjmaciei-mobl4> <3516872.4RhFvKrMWZ@tjmaciei-mobl4> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed X-Trace: ger.gmane.org 1420031184 24689 80.91.229.3 (31 Dec 2014 13:06:24 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 31 Dec 2014 13:06:24 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCRLNYMEK4IMP2MPUUCRUBGEDEGPO@isocpp.org Wed Dec 31 14:06:17 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-we0-f199.google.com ([74.125.82.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Y6Iye-0002Mc-PQ for gclcip-std-proposals@m.gmane.org; Wed, 31 Dec 2014 14:06:16 +0100 Original-Received: by mail-we0-f199.google.com with SMTP id k11sf1268747wes.2 for ; Wed, 31 Dec 2014 05:06:16 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :subject:references:in-reply-to:content-type:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe; bh=ngJdO6FhNZCbAjNMMRhDt2Zh5ZHgl8xQuLjYILw7Zuo=; b=WJ48UOMqBruX0vjg2RM/P3NEPzKK+zxoblE7hU0VLkatiKKrn24joNNBr038trxCSh fEOWNaWTt0iYe/bMcKmYhwgSt82LDEFTWsGW05jxJ4rpaKQMaQep9GjVCsivqp3rxpze vwVb4eX4juXp3LM3A5IMPctI1OVDYX1Rt3SA5+EvlaMLg0ZyXxWIQGu78tYb5raU75du XjwUt8gNi1j11BjNHJys99yEDsqO2NrzFOVW8MU4ioIp3EgNOvN9aiGLSlaxN+n6rySx s/NHmAy2VowOqeolyOzTiFbn67hGlXQII8UUsIQNBVafQ8nEXqdrZXUj381vbwt/3or8 W8mA== X-Gm-Message-State: ALoCoQm20Qswg2Q7irImth01ue+7cdM1Vjbs4Vcp2Ai7o1u9xcsvY44OY3H4WuI/sCR0vH1jW0d0 X-Received: by 10.194.95.74 with SMTP id di10mr7795514wjb.0.1420031176250; Wed, 31 Dec 2014 05:06:16 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.221.195 with SMTP id qg3ls2103093wic.52.canary; Wed, 31 Dec 2014 05:06:15 -0800 (PST) X-Received: by 10.194.191.227 with SMTP id hb3mr132486790wjc.79.1420031175195; Wed, 31 Dec 2014 05:06:15 -0800 (PST) Original-Received: from mx-aarh-5.stofanet.dk (mx-aarh-5.stofanet.dk. [212.10.10.16]) by mx.google.com with ESMTPS id cu3si84199254wjb.20.2014.12.31.05.06.15 for (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Wed, 31 Dec 2014 05:06:15 -0800 (PST) Received-SPF: none (google.com: breese@mail1.stofanet.dk does not designate permitted sender hosts) client-ip=212.10.10.16; Original-Received: from 56340df4.rev.stofanet.dk ([86.52.13.244] helo=[192.168.1.145]) by mx-aarh-5.stofanet.dk (envelope-from ) with esmtpa id 1Y6Iyc-00032l-2E for std-proposals@isocpp.org; Wed, 31 Dec 2014 14:06:14 +0100 User-Agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 In-Reply-To: <3516872.4RhFvKrMWZ@tjmaciei-mobl4> X-Original-Sender: breese@mail1.stofanet.dk X-Original-Authentication-Results: mx.google.com; spf=none (google.com: breese@mail1.stofanet.dk does not designate permitted sender hosts) smtp.mail=breese@mail1.stofanet.dk 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:15411 Archived-At: On 12/30/2014 02:42 AM, Thiago Macieira wrote: > Because the pattern is: > > if (!container.contains(x)) > container.insert(x, value); Both ordered and unordered map insert() checks if the key already exists, so you can just use: container.insert(x, value); -- --- 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/. .