220 33507 article Path: news.gmane.org!.POSTED!not-for-mail From: Ville Voutilainen Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Free function std::contains in algoritm and map Date: Tue, 1 Aug 2017 20:29:22 +0300 Lines: 51 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" X-Trace: blaine.gmane.org 1501608564 11081 195.159.176.226 (1 Aug 2017 17:29:24 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 1 Aug 2017 17:29:24 +0000 (UTC) To: "ISO C++ Standard - Future Proposals" Original-X-From: std-proposals+bncBC5JHI7A7ALRB47UQLGAKGQE6Y6535A@isocpp.org Tue Aug 01 19:29:20 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yw0-f198.google.com ([209.85.161.198]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dcayt-0002bn-5Z for gclcip-std-proposals@m.gmane.org; Tue, 01 Aug 2017 19:29:19 +0200 Original-Received: by mail-yw0-f198.google.com with SMTP id t139sf35533127ywg.6 for ; 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[2607:f8b0:400c:c05::244]) by mx.google.com with ESMTPS id i37si14920002uag.363.2017.08.01.10.29.23 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 01 Aug 2017 10:29:23 -0700 (PDT) Received-SPF: pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400c:c05::244 as permitted sender) client-ip=2607:f8b0:400c:c05::244; Original-Received: by mail-vk0-x244.google.com with SMTP id x10so1081240vkd.2 for ; Tue, 01 Aug 2017 10:29:23 -0700 (PDT) X-Received: by 10.31.206.133 with SMTP id e127mr9037420vkg.145.1501608563431; Tue, 01 Aug 2017 10:29:23 -0700 (PDT) Original-Received: by 10.103.103.65 with HTTP; Tue, 1 Aug 2017 10:29:22 -0700 (PDT) In-Reply-To: X-Original-Sender: ville.voutilainen@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.b=Wuh+xVCT; spf=pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400c:c05::244 as permitted sender) smtp.mailfrom=ville.voutilainen@gmail.com; dmarc=pass (p=NONE sp=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:33507 Archived-At: On 1 August 2017 at 20:26, Ville Voutilainen wrote: > On 1 August 2017 at 20:22, wrote: >> Instead of comparing with end(), there could be a new function - contains. >> >> Now >> >> if(std::find(vector.begin(), vector.end(), item) != vector.end()){ >> // found >> } else { >> // not found >> } >> >> // maps >> >> if(map.find("key") != map.end()){ >> // found >> } else { >> // not found >> } >> >> >> >> I propose "contains" function: >> >> if(std::contains(vector.begin(), vector.end(), item)){ >> // found >> } else { >> // not found >> } >> >> // maps >> >> if(map.contains("key")){ >> // found >> } else { >> // not found >> } > > > Just use std::count and map::count. ...well, except that wastes cycles since it won't stop before the end of the range for vector. -- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. 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