220 4795 article Path: news.gmane.org!not-for-mail From: Mikhail Semenov Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Changing lambda scope Date: Sun, 2 Jun 2013 11:12:57 -0700 (PDT) Lines: 110 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: multipart/alternative; boundary="----=_Part_26_9023732.1370196777509" X-Trace: ger.gmane.org 1370196780 10939 80.91.229.3 (2 Jun 2013 18:13:00 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 2 Jun 2013 18:13:00 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDC55PNFRYGRBKUWV2GQKGQESQ5CBTY@isocpp.org Sun Jun 02 20:13:01 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yh0-f71.google.com ([209.85.213.71]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1UjCm4-0002Bf-3S for gclcip-std-proposals@m.gmane.org; Sun, 02 Jun 2013 20:13:00 +0200 Original-Received: by mail-yh0-f71.google.com with SMTP id a41sf4602169yho.10 for ; Sun, 02 Jun 2013 11:12:59 -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=omfkQRsvlEghB6eloKmvTyGVlN5kU/joWrPYiLX6cgg=; b=bsv5s/Tz1qJPkOTnjxIZJ4xv8muKBKYNmpU4NZhmDlKWGvX3IrNQ5q0ugfKtKE5t0R OX03thOH3Gt+lfhGuD1teNN+4wS/uVc9rMNsGvC4G55jYe//pTiSlDqGbyq3VnUibblh UVcMiNCpXCooThyMkrwto7sWZOdKHI2MbliL8TFhZbdtVv+NDWelGKKemWgHQeCNgwJG Etnf68lEdx3lVKa06ZDIK7StKCOIfO/BVTdbF6SII9EVUW8m4pPXZzrKLWZOnYgoOt/B b6Ho8GHsD+pu2/ZoA4hyEiDkhFnD88BSrc6rEv2jvdYBr2zVKJtLJ35l6vQVnhr0jbuX yoew== X-Received: by 10.224.174.145 with SMTP id t17mr12047294qaz.4.1370196778911; Sun, 02 Jun 2013 11:12:58 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.86.202 with SMTP id r10ls1814974qez.86.gmail; Sun, 02 Jun 2013 11:12:58 -0700 (PDT) X-Received: by 10.49.1.197 with SMTP id 5mr1432683qeo.24.1370196778039; Sun, 02 Jun 2013 11:12:58 -0700 (PDT) In-Reply-To: X-Original-Sender: mikhailsemenov1957@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:4795 Archived-At: ------=_Part_26_9023732.1370196777509 Content-Type: text/plain; charset=ISO-8859-1 > > And the following code works. I think auto may be the problem. > #include #include bool ok = true; namespace range { template auto operator|(L l, R r) // -> int { return l(ok)+r(ok); } template auto map(T t) //-> std::function { return [=](bool range) -> int { if (range) return t.i; return 0; }; } } struct A { int i; A(int i1):i(i1) {} }; int main() { A a1(5); A a2(6); int k = range::map(a1) | range::map(a2); std::cout << k << std::endl; // 11 ok = false; k = range::map(a1) | range::map(a2); std::cout << k << std::endl; // 0 } -- --- 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_26_9023732.1370196777509 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

And the following code works. I think aut= o may be the problem.

#include <iostream>
#include <functional>

bool ok =3D true;
namespace r= ange
{
    template<typename R, typename L> aut= o operator|(L l, R r) // -> int
    {
  &= nbsp;      return l(ok)+r(ok);   &n= bsp;
    }
    templ= ate<typename T> auto map(T t) //-> std::function<int(bool)><= br>    {
        retur= n [=3D](bool range) -> int
       = {
            if= (range) return t.i;
        &nb= sp;   return 0;
        };<= br>    }
}

struct A
{
int i;
A(int i1):i(i1= ) {}
};

int ma= in()
{
    A a1(5);
  = ; A a2(6);
    int k =3D
    = ;    range::map(a1)
      &= nbsp; | range::map(a2);
    std::cout << k <<= std::endl; // 11
   = ; ok =3D false;

    k =3D
= ;       range::map(a1)
   &= nbsp;    | range::map(a2);
    std::cout &= lt;< k << std::endl; // 0
=
}

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