220 33182 article Path: news.gmane.org!.POSTED!not-for-mail From: Matthew Woehlke Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Add a few missing things from the iterator library Date: Wed, 12 Jul 2017 09:56:22 -0400 Lines: 43 Approved: news@gmane.org Message-ID: References: <6e2d133b-1c0a-49a9-ae2b-98d82d3a40d3@isocpp.org> <74994441.Y8ukuuY6jn@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" X-Trace: blaine.gmane.org 1499867804 26385 195.159.176.226 (12 Jul 2017 13:56:44 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 12 Jul 2017 13:56:44 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0 To: std-proposals@isocpp.org, Thiago Macieira Original-X-From: std-proposals+bncBC37LBFWUIFBBDWVTDFQKGQE72LWY2I@isocpp.org Wed Jul 12 15:56:38 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pg0-f69.google.com ([74.125.83.69]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dVI7v-00065o-6x for gclcip-std-proposals@m.gmane.org; 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[66.194.253.20]) by smtp.googlemail.com with ESMTPSA id m27sm1569555ioi.19.2017.07.12.06.56.29 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 12 Jul 2017 06:56:29 -0700 (PDT) Original-Newsgroups: gmane.comp.lang.c++.isocpp.proposals In-Reply-To: <74994441.Y8ukuuY6jn@tjmaciei-mobl1> Content-Language: en-US X-Original-Sender: mwoehlke.floss@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.b=L7IlQaKD; spf=pass (google.com: domain of mwoehlke.floss@gmail.com designates 2607:f8b0:4001:c06::243 as permitted sender) smtp.mailfrom=mwoehlke.floss@gmail.com; dmarc=pass (p=NONE sp=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:33182 Archived-At: On 2017-07-12 02:27, Thiago Macieira wrote: > void f(std::unordered_map::const_iterator) {} > > template > void g(ForwardIterator it) > { > f(std::make_const(it)); > } > > void h() > { > std::unordered_map m; > g(m.begin()); > } > > Please write std::make_const such that the code above works. template auto make_const( std::__detail::_Node_iterator, false, false> iter) -> std::__detail::_Node_const_iterator, false, false> { return iter; } ....? Yeah, you need ugly partial specializations / overloads that depend on implementation details... so what? At worst, there needs to be a type trait to derive the const_iterator type given the iterator type, or something along those lines. That doesn't seem fatal... -- Matthew -- 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/b9b96a13-c0c7-43cc-de3a-e993847f5f8c%40gmail.com. .