220 4600 <90375ba5-8005-47da-9e84-eee151d0ba0a@isocpp.org> article Path: news.gmane.org!not-for-mail From: DeadMG Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Changing lambda scope Date: Sun, 26 May 2013 07:50:36 -0700 (PDT) Lines: 189 Approved: news@gmane.org Message-ID: <90375ba5-8005-47da-9e84-eee151d0ba0a@isocpp.org> References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_347_30355648.1369579836042" X-Trace: ger.gmane.org 1369579839 1861 80.91.229.3 (26 May 2013 14:50:39 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 26 May 2013 14:50:39 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDFMT44JSEMBBPGCRCGQKGQEDU6AKAY@isocpp.org Sun May 26 16:50:40 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-gh0-f198.google.com ([209.85.160.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1UgcHO-00084r-BM for gclcip-std-proposals@m.gmane.org; Sun, 26 May 2013 16:50:38 +0200 Original-Received: by mail-gh0-f198.google.com with SMTP id r13sf6963086ghr.1 for ; Sun, 26 May 2013 07:50:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-beenthere:date:from:to:message-id:in-reply-to:references:subject :mime-version:x-original-sender:reply-to:precedence:mailing-list :list-id:x-google-group-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=akECUwWJ9c635F1kCsPV95kaP6KQwbtDhvoLTzpN5Gk=; b=y4LEVHZqfKFb+xoPI+AcKmloIRaC85iHS2umWPo9iKidz92LR/j1ixsU8x8kcc7hxb 1V8NVETQTqIDnktjYnFn/0DG6Npa7cBZtefbC+9f8csg0Csby1HmS9ZauKcEIoSXtS9i gn12aPPaC4VXh5Auq6vSjZl2kvMSlyO5N8AolSCWaCeTeYQ8EwF2KykqmKnSnHYzISiB Z6rHAtzuJWzqbonlOlGPMhE3Lig8/KSR03SyYO9nsLfVbISxQc9BmnG0su+AOPMMQV3E CsczTgFGiPgtSupAJASw+HQpdTnJBqppOAr5ADX14IYzpClI3nDAm+Xt2dL0lYD8ILEB LN2w== X-Received: by 10.224.205.138 with SMTP id fq10mr6998460qab.1.1369579837502; Sun, 26 May 2013 07:50:37 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.36.9 with SMTP id m9ls2417592qej.55.gmail; Sun, 26 May 2013 07:50:36 -0700 (PDT) X-Received: by 10.49.86.98 with SMTP id o2mr2099326qez.4.1369579836330; Sun, 26 May 2013 07:50:36 -0700 (PDT) In-Reply-To: X-Original-Sender: wolfeinstein@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:4600 Archived-At: ------=_Part_347_30355648.1369579836042 Content-Type: text/plain; charset=ISO-8859-1 Sure. Consider namespace range { template auto operator|(L l, R r) { return r(std::move(l)); } template auto map(T t) { return [=](auto range) { auto var = range(); if (var) return optional::type>(t(*var)); return std::none; }; } } int main() { something | range::map([]...) | range::map([]...) etc } It's part of a range design I am working on. I have implemented everything I need but the lambda ADL problem means that I can't use lambdas when I should be able to, because the range-combine operator| can't be found. -- --- 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/?hl=en. ------=_Part_347_30355648.1369579836042 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Sure. Consider

namespace range {
    template<typename R, typename L> = auto operator|(L l, R r) = {
 = ;       return r(std::move(l));
    }
    template<typename T> auto map<= /span>(T t) {
        return [=3D](auto range) {<= /span>
  =           auto var =3D range= ();
     =       if (var) return optional<typename std::decay<= decltype(<= /span>t(*var))>::type>(t(*var));
=             return std::none;
        };
    }
}=
int main<= span style=3D"color: #660;" class=3D"styled-by-prettify">() {
    something
   =     | ran= ge::map([]...)
      &= nbsp; | range= ::map([]...)
        etc=
}

It's part of a range design I am w= orking on. I have implemented everything I need but the lambda ADL problem = means that I can't use lambdas when I should be able to, because the range-= combine operator| can't be found.

--
 
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Visit this group at http://groups.google.com/a/isocpp.org/group/std-pro= posals/?hl=3Den.
 
 
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