220 11855 <7411f096-742f-4e9b-a265-1b05a1af5521@isocpp.org> article Path: news.gmane.org!not-for-mail From: tomaszkam@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: N4078: Rvalue reference overloads for value() method returns object by value Date: Fri, 11 Jul 2014 02:49:09 -0700 (PDT) Lines: 76 Approved: news@gmane.org Message-ID: <7411f096-742f-4e9b-a265-1b05a1af5521@isocpp.org> References: <4DA018C3-2327-4F55-B7F8-7988EC7B789A@gmail.com> <1a858a77-310b-4591-aaf5-960c40d9f5fc@isocpp.org> <66AF41C1-CB37-4311-98EA-D47DBC6068DC@gmail.com> <66c38b61-7a95-4ace-b34f-2346bb334fb9@isocpp.org> <6F4B3C72-9962-48DC-8527-0C89EA1B9710@gmail.com> <35873CE5-ED8C-4C03-A6A1-E4132DECD91F@gmail.com> <335948E6-8140-4673-B958-930356A52070@gmail.com> <76ACA175-5A44-4BE8-B49F-BAC6DA65E6B1@gmail.com> <4D3852AD-1AEB-44BA-941C-D645BAD19405@gmail.com> <6a4b6425-1167-40c1-acd8-3945c8cd4c74@isocpp.org> <13DD0D7A-A146-4667-9F30-6FB3739CDBE0@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_125_29749322.1405072149647" X-Trace: ger.gmane.org 1405072160 15912 80.91.229.3 (11 Jul 2014 09:49:20 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 11 Jul 2014 09:49:20 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDNPVXXG6IGBBFXG72OQKGQECZT7ULY@isocpp.org Fri Jul 11 11:49:13 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qa0-f69.google.com ([209.85.216.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1X5XS4-0008JM-A6 for gclcip-std-proposals@m.gmane.org; Fri, 11 Jul 2014 11:49:12 +0200 Original-Received: by mail-qa0-f69.google.com with SMTP id v10sf2858751qac.0 for ; Fri, 11 Jul 2014 02:49:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe :content-type; bh=kGmUhV8OY9XjrkXH6S5nGFBB0wEfyhA4rpacg119cKM=; b=GDsmcvZCniEzd1dSreeE0ZKQvUSxanfmhKHmaWwUfZheui9LL2SK6kHauoxmDl4J7T gnbhzZP8UQCRSXuSr82zaBgqA1LjXMCF7PP1ZSM+ROfE/xADgpQJ5sgjFo33gfIX13om Re7IXkzgGbJGhx/4mgBgW2muovZ2HD71YfrwmloEx1zitaRfFQH0moBJLk7VrTf05Hsr jUnrLZ5ESfRCDgXSouAzNfJ7ZiLbAh+WcS56V5hkUQDoXUvK+rEuLJoeAcHpKMq/uZZz dv1KcjoIpj+5/fQP0ob3xFPi8cpv3EZSShkJ3jnOvm+n4GkUjJ0AqtyTOjphxBBC9yIC IFAw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=kGmUhV8OY9XjrkXH6S5nGFBB0wEfyhA4rpacg119cKM=; b=X7AgBCf1RyTvI8rWtLwjl1xt65jTCUbL5turIvz+UkcmKV2SkbzxgdHAyWsgSoXkmE yngD0Bm497e2q+xh82mX8SQX/c5JElJirpsn3GGkl6YaZM3OjVQ0x4vk1IMAduayTR6w vonwwHDO9RETqCP8IeJJQrf84iSqTrnjq4hw237Ye+LrkEJHuwiguNvKwaJo7ld3N2Kn 2OjPImigeBFYZbPktjI8auFyEUBV5KMjwMo2Mkq4wdvTqE6MOQoCU8Gd05PtxDTeGQUO uczMlb3dCxMLGYQBPTDcPXu0k7f5mEHh99eNIcmVTW8oPZTRH7CNao3RQtk8YXnSH2PR I/Ew== X-Gm-Message-State: ALoCoQn8MV3G6g01HALgKMGsT25cZlYXZMPblm8PMxy7E+nti9LwygGFGjuHXcH8rAeSt0H7LyF3 X-Received: by 10.58.32.163 with SMTP id k3mr17708556vei.28.1405072151525; Fri, 11 Jul 2014 02:49:11 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.182.109.137 with SMTP id hs9ls314322obb.86.gmail; Fri, 11 Jul 2014 02:49:10 -0700 (PDT) X-Received: by 10.182.1.230 with SMTP id 6mr6002obp.31.1405072150632; Fri, 11 Jul 2014 02:49:10 -0700 (PDT) In-Reply-To: X-Original-Sender: tomaszkam@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:11855 Archived-At: ------=_Part_125_29749322.1405072149647 Content-Type: text/plain; charset=UTF-8 Acutall case does even need susbtitute: template< typename container_handle > void operate_on_fifth_thing( container_handle && ch ) { process_for_a_long_time( * std::forward< container_handle >( ch ) )[ 5 ] ); } That willl work with any body: template void with(T&& t, FV&& fv) { std::forward(fv)(std::forward(t)); } template< typename container_handle > void operate_on_fifth_thing( container_handle && ch ) { with(( * std::forward< container_handle >( ch ) )[ 5 ], [](auto && fifth_thing) { // This is illustrated as a function call, but there might as well be a loop here. process_for_a_long_time( std::forward< decltype( thing ) >( fifth_thing ) ); }); } -- --- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. 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Acutall case does even need sus= btitute:
template< typename container_han= dle >
void operate_on_fifth_thin= g( container_handle && ch ) {
  process_for_a_long_time( * std::forward< container_handle >( ch ) )[ 5 ] )= ;
}

That willl = work with any body:
template<typename T, typename F>
void with(= T&& t, FV&& fv) { std::forward<FV>(fv)(std::forward&l= t;T>(t)); }

template< typename con= tainer_handle >
void operate_on_= fifth_thing( container_handle && ch ) {
    with(= ( * std::forward< container_handle >( c= h ) )[ 5 ], [](auto && fifth_thing) {=
      // This is illustrated as a function = call, but there might as well be a loop here.
      process_for_a_long_time( std::forward<= decltype( thing ) >( fifth_thing ) );
    });
}

--

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