220 36973 <96975ffe-e956-4c04-b8bf-140a6520bfd2@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: frederik.hertzum@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Add std::begin and std::end for regular expression iterators Date: Tue, 20 Feb 2018 00:35:28 -0800 (PST) Lines: 95 Approved: news@gmane.org Message-ID: <96975ffe-e956-4c04-b8bf-140a6520bfd2@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_15160_1828667455.1519115728312" X-Trace: blaine.gmane.org 1519115627 20986 195.159.176.226 (20 Feb 2018 08:33:47 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 20 Feb 2018 08:33:47 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCZJN6FD4AKRBUN3V7KAKGQEQ54GBAI@isocpp.org Tue Feb 20 09:33:42 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-vk0-f70.google.com ([209.85.213.70]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eo3Ma-00041g-EE for gclcip-std-proposals@m.gmane.org; Tue, 20 Feb 2018 09:33:24 +0100 Original-Received: by mail-vk0-f70.google.com with SMTP id n135sf8126676vke.9 for ; Tue, 20 Feb 2018 00:35:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:subject:mime-version:x-original-sender :reply-to:precedence:mailing-list:list-id:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=0l9es68q7fZJb2lx1JGse7+68DpCdVi4xuQOljGzDiI=; b=NsJWkiwOx9RG9mVaYV8VNE25962p6tMPwciMhzuvlaipt4JiOYNu7HVhdApaBkmwzY b7zIHvqidaN5JUBsHBxUWC3Z/5jyMv6Eg07YC7SEq7KsdLX+yzfN5qv39oPfywuXpN0v ULCbIw2i2N+jo08Z5GvYdhc5IKmR9hwXVrqg635L3orWhnhEaiNtjs1XjQ2zxIDA7qut gVzfJD0XHQou8BXZVtsxGfQoglvr+12YawcmeSY8gtQ6fB+08q5E1uz2LkspPCZgwTh/ fRroVEaIBbHx8lyTvt+pjwpiz87aOM1YkZyztvxh3uGW7v2bH9v27BN8MiTM3UHaHphg cxWA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:message-id:subject:mime-version:x-original-sender :reply-to:precedence:mailing-list:list-id:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=0l9es68q7fZJb2lx1JGse7+68DpCdVi4xuQOljGzDiI=; b=DY3znVyoCLLrIe8xsRL2YUsPaRXuDWU0E0OR4WNbGspxBOO4HJhkGwbpM4FIxrcOxM EozC2/k9P9PU7eEM3gU3B/s68XsVzxHzIQZWUydOmHBYi6Ucns92z6ecfY/sIwUw6x7T LBurJd7MRf3eJXMykgoy0k+0OJLXuK/E7rdkqw03YM6xMYtmxAhLrKfCYNzTekONhTm0 aBoZJZ/K5PC1fU38XlyI2aefAoib0chU+mEBW8ivb+fcVMnoUCFnIxX9q1Up7bXYNV8Q Fg3ke1447j476PcTHzyqNEJ5KIsKyGPpdLYBLm+w2Rml6vtrXwLsXBTV6qX+9rJ9eIgH emNQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:message-id:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=0l9es68q7fZJb2lx1JGse7+68DpCdVi4xuQOljGzDiI=; b=fsh2vd7eq9BP4pqZisOZJBGqGyhG0AAN6JLPl1RnoyeEN6PjCs0Uayk9Q/FeNwIIl+ yI4Abw3bOaT9SPif30cYtTxo1Mjde7xpxA7Tx4Kpi7eoQ0ytnGISQsGPEbvEds8PZ1/7 Ov/z9QXwmk3ChDbgQxbv+q28Wfj266fypRoGXXh4weYzKPerPzPms7qmfXQslGxANJbQ fgELpHWCMPGwyxcz2Aqw1mU2uPbFqew6/Sst52PMdGpdykF0pKxQSXirI5/6RG4p5w8+ wvloFaKYDAwGCz3+lhsCxQ/NU3KYaQQUtn0vjsgmtj+KcTuKT7RUCVmGyxass00S7Lvi Lw0g== X-Gm-Message-State: APf1xPAqP+rnWXFcNbwo83H11V8anwJ2PWZ+babvmgH43zbw9vPzRGuM zhQOBHeGvgbo603M1YuA0Rw7Ig== X-Google-Smtp-Source: AH8x224o1PrLsjdFPmtVJOTNdXHLLSK5wNhIzrs2IJ5QQ0VX1/KPd9SY8S+6vgH8PaJfpyiZYR6v6A== X-Received: by 10.31.10.137 with SMTP id 131mr2651031vkk.85.1519115730481; Tue, 20 Feb 2018 00:35:30 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.31.148.73 with SMTP id w70ls800536vkd.18.gmail; Tue, 20 Feb 2018 00:35:28 -0800 (PST) X-Received: by 10.31.182.77 with SMTP id g74mr1941945vkf.12.1519115728663; Tue, 20 Feb 2018 00:35:28 -0800 (PST) X-Original-Sender: frederik.hertzum@gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org 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:36973 Archived-At: ------=_Part_15160_1828667455.1519115728312 Content-Type: multipart/alternative; boundary="----=_Part_15161_1583106779.1519115728312" ------=_Part_15161_1583106779.1519115728312 Content-Type: text/plain; charset="UTF-8" Currently, it is not possible to use extended for-loops with stuff like std::sregex_iterator, because there is no .begin()/.end() pair and no std::begin/std::end pair for std::sregex_iterator -- adding an overload for std::sregex_iterator to the std-namespace is trivial and doing so will allow using them in extended for-loops. I'm already doing this in production code and so far, have found no issues with it. My implementation is fairly simple: std::begin(std::sregex_iterator&) returns the argument and std::end(std::sregex_iterator&) return a default constructed std::sregex_iterator: namespace std { auto end(std::sregex_iterator& ) -> std::sregex_iterator& { static std::sregex_iterator end_of_sequence_iterator; return end_of_sequence_iterator; } auto begin(std::sregex_iterator& b) -> std::sregex_iterator& { return b; } } -- 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. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/96975ffe-e956-4c04-b8bf-140a6520bfd2%40isocpp.org. ------=_Part_15161_1583106779.1519115728312 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Currently, it is not possible to use extended for-loops wi= th stuff like std::sregex_iterator, because there is no .begin()/.e= nd()=C2=A0pair and no std::beg= in/std::end pair for std::sregex_iterator -- adding a= n overload for std::sregex_iterator to the std-namespace is = trivial and doing so will allow using them in extended for-loops.

<= /div>
I'm already doing this in production code and so far, have fo= und no issues with it.

My implementation is fairly= simple: std::begin(std::sregex_itera= tor&) returns the argument and std::end(std::sregex_iterator&) return a default constructe= d std::sregex_iterator:
<= div>

namespace std {
auto end(std::sregex_i= terator& ) -> std::sregex_iterator& {
stat= ic std::sregex_iterator end_of_sequence_iterator;
ret= urn end_of_sequence_iterator;
}

auto begin(std::sr= egex_iterator& b) -> std::sregex_iterator& {
return b;
}
}

--
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To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+unsubscribe@isocpp.org.
To post to this group, send email to std-proposals@isocpp.org.
To view this discussion on the web visit https://groups.google.= com/a/isocpp.org/d/msgid/std-proposals/96975ffe-e956-4c04-b8bf-140a6520bfd2= %40isocpp.org.
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