220 10173 article Path: news.gmane.org!not-for-mail From: Ville Voutilainen Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: std::conditional pick() function? Date: Fri, 4 Apr 2014 20:50:22 +0300 Lines: 22 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 X-Trace: ger.gmane.org 1396633832 7271 80.91.229.3 (4 Apr 2014 17:50:32 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 4 Apr 2014 17:50:32 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC5JHI7A7ALRBXXB7OMQKGQEAJFG7HA@isocpp.org Fri Apr 04 19:50:25 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ig0-f197.google.com ([209.85.213.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1WW8G0-0001vc-KL for gclcip-std-proposals@m.gmane.org; Fri, 04 Apr 2014 19:50:24 +0200 Original-Received: by mail-ig0-f197.google.com with SMTP id hn18sf2695011igb.8 for ; Fri, 04 Apr 2014 10:50:23 -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:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe:content-type; bh=1Fa5JFpMfjJ+EMLTHI2TlOHPGKGtq7Y6zFYmCSp+v/0=; b=g7Pgfp/Yb1mCgGAJHuANm9Kv5+IJJET7PJAvPHzfpOy+2Mvky6JZPDspIyA6POsc2S 7se829+O53VNTXxucOPF2Ho0VX0z/3+D46vKrwCs1ugT+aRa8K8XGmsQtqTxq4jg16do p+phI+qqhdT1KlSk4K5pjWWnMuuCzHcaanUlC/ICS1T+5DcgXyAVfvXThoC62TpifZ0J VevtyCSlta1/v8k73ItZ4mu4jM6jNPuII6w+nteHRa0sTlYpst2mtbE/kTJHHPLI/Fi8 1S0Vk9PQMY/g3ARWZyf+YlMN5xNdMrERLhG+PZKWz+3ls4LiXiNx0AHJfyJkOsCpdqC+ 85vA== X-Gm-Message-State: ALoCoQkfxBfg0pcUgrqVNjbSMLS5qqRW21COOoFmk1tLeVl+4u8wD28JrXZ/gUhmfBB0BVT8q9Sx X-Received: by 10.50.62.106 with SMTP id x10mr2582136igr.2.1396633823542; Fri, 04 Apr 2014 10:50:23 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.106.202 with SMTP id e68ls557346qgf.12.gmail; Fri, 04 Apr 2014 10:50:22 -0700 (PDT) X-Received: by 10.224.163.10 with SMTP id y10mr3733105qax.102.1396633822754; Fri, 04 Apr 2014 10:50:22 -0700 (PDT) Original-Received: from mail-qa0-x236.google.com (mail-qa0-x236.google.com [2607:f8b0:400d:c00::236]) by mx.google.com with ESMTPS id v6si3746073qas.275.2014.04.04.10.50.22 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 04 Apr 2014 10:50:22 -0700 (PDT) Received-SPF: pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400d:c00::236 as permitted sender) client-ip=2607:f8b0:400d:c00::236; Original-Received: by mail-qa0-f54.google.com with SMTP id w8so3485108qac.13 for ; Fri, 04 Apr 2014 10:50:22 -0700 (PDT) X-Received: by 10.224.13.142 with SMTP id c14mr16507504qaa.76.1396633822637; Fri, 04 Apr 2014 10:50:22 -0700 (PDT) Original-Received: by 10.224.10.17 with HTTP; Fri, 4 Apr 2014 10:50:22 -0700 (PDT) In-Reply-To: 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:f8b0:400d:c00::236 as permitted sender) smtp.mail=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-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:10173 Archived-At: On 4 April 2014 20:37, Tony V E wrote: > Does anyone else (besides me) need a function like > > template > std::conditional::type pick(X x, Y y); > > that returns x or y (and type X or Y) based on the compile-time bool? I have certainly written a run-time version of it umpteen times. At those times I didn't have the possibility to write a compile-time version. Whether that is sufficient reason to standardize it is another matter. Very mildly in favor... -- --- 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/. .