220 33166 <00dbc427-c520-42f8-b92d-6c12d600483f@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: Ray Hamel Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Add a few missing things from the iterator library Date: Mon, 10 Jul 2017 11:35:23 -0700 (PDT) Lines: 105 Approved: news@gmane.org Message-ID: <00dbc427-c520-42f8-b92d-6c12d600483f@isocpp.org> References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_1858_869514192.1499711724064" X-Trace: blaine.gmane.org 1499711737 902 195.159.176.226 (10 Jul 2017 18:35:37 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 10 Jul 2017 18:35:37 +0000 (UTC) Cc: gafunchal@gmail.com To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDPM7JNEVQJRB3ERR7FQKGQEG3G2U3Q@isocpp.org Mon Jul 10 20:35:25 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 1dUdWi-0007y2-Qk for gclcip-std-proposals@m.gmane.org; Mon, 10 Jul 2017 20:35:21 +0200 Original-Received: by mail-pg0-f69.google.com with SMTP id s4sf124524788pgr.3 for ; Mon, 10 Jul 2017 11:35:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc: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; bh=RlG3ctmZHFLnsvuXNhNxyjvJC9xwlEeiZxvNaCwfqas=; b=cWQjzZcM/KEVEsr0ew2lbHGvyOJfkcxN/8TkbvNcH4LgesYiddltbMrEuWtkzWgx1R cVwGwphG//RH4PxN3QsNbBFEl+0hIdhlb2FV1vVS2Vnrrhbzp4UmM1xe+AKwvnLO4QPR jo5efcnyWFHBLoiq5OcnAIec7T2c7dBy6mqrYfkVXFDLmBTKjC6gi8Q6dDgafleg4CdY MLTANy58h7+Y5ZqTaVvedWj9DD92C2N8AhTHv6st1UuenRWfddzB1HkquuKApL7kJGnV TJO/grCq5TZ5h0MRGiYsFmmilikPdygoCgHaj0L1bJmJ3wER4UmqHSsDFWBXsQtHWnjd oUCw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc: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; bh=RlG3ctmZHFLnsvuXNhNxyjvJC9xwlEeiZxvNaCwfqas=; b=rJoAH9ppmSp6Wyhdw3ZO810n5n2ylzspKlhVvikwb4ArUaerct1cWYjF//5jKaLUzL PQ57G8bwc4AfJY0C3PMrsuXGe/BSeehcvMWDnMIDQO1mpC8taGFLVF24LZ51J6MU/Gt/ IROy/u0XpQmGP7VX6APb/5AbepR9nrutUPg6EJ6RV2wQ13HwE+/JHRdW1qy99IG0h94w My/guKwBlXC1PqetzCNy6mq4BBD5iCnOoMR73krhKhzuRKRVPOAQmtOnvEDKM24kjVf9 IOmHB75N2Fb1XSFPP+cG87JA/3og2bbfeCWhT8FahkUqgMcK/0jCSLu/Yik97gkBt1+d cG9A== 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:cc:message-id:in-reply-to :references: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=RlG3ctmZHFLnsvuXNhNxyjvJC9xwlEeiZxvNaCwfqas=; b=X88TcjqA9TcCu/vEIcXY+Q2tn6Sf83YWFKX7YGL16xlDCwkAFgLjA43XbiM+wqF+XY xCA5WUBM8m8b2kFYsPJfieuJ90MrdlcEV/jWaxBrEMh21xBKisQCkiuoPm6Q4G/sKdLY rYRVB6PjwqPFUkJQprBh8eJ93Xr/zdqkSB8pKnxIBXzNsRkhdfN79ld5sytZQA8XP7gK NFPceg1t6fXwJoFTVtY95lSQDK3qqUMDsXTCXMWcnKSm+73uV36QiJLV0MtLt7ebAk54 5qjZ8jLYsXeN4/R5RSWnDj0ExjJtiXIK2vavygcqdiY8O//tS4ZzrB0QonxNORvBlIIp /r7Q== X-Gm-Message-State: AIVw112pJeqS3FYNIwO7zoEIDHpee0ZeR7zfgrxDUNR+ifBvyHNAJqI1 J3s302zpTxG3nJay X-Received: by 10.98.252.75 with SMTP id e72mr10289781pfh.21.1499711725900; Mon, 10 Jul 2017 11:35:25 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.51.212 with SMTP id z203ls84784ioz.53.gmail; Mon, 10 Jul 2017 11:35:24 -0700 (PDT) X-Received: by 10.36.29.212 with SMTP id 203mr515556itj.5.1499711724446; Mon, 10 Jul 2017 11:35:24 -0700 (PDT) In-Reply-To: X-Original-Sender: rayghamel@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:33166 Archived-At: ------=_Part_1858_869514192.1499711724064 Content-Type: multipart/alternative; boundary="----=_Part_1859_1324128622.1499711724064" ------=_Part_1859_1324128622.1499711724064 Content-Type: text/plain; charset="UTF-8" On Monday, July 10, 2017 at 1:47:29 PM UTC-4, gafu...@gmail.com wrote: > > 3) std::container_of_t > Semantics: determine the container type of the iterator > Why: Helpful to implement 2 above, also helpful in a variety of situations > where there's a need to check requirements on the container of an iterator. > Someone with more knowledge of template metaprogramming and the type system than I do needs to weigh in on this, but I'm not sure if this is currently possible in ISO C++. An alternative might be something like std::container_from_value_type> std::container_from_iterator> -Ray -- 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/00dbc427-c520-42f8-b92d-6c12d600483f%40isocpp.org. ------=_Part_1859_1324128622.1499711724064 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Monday, July 10, 2017 at 1:47:29 PM UTC-4, gafu...@gmai= l.com wrote:
3) std::cont= ainer_of_t<decltype(iterator)>
Semantics: determine th= e container type of the iterator
Why: Helpful to implement 2 abov= e, also helpful in a variety of situations where there's a need to chec= k requirements on the container of an iterator.

Someone with more knowledge of template metaprogramming an= d the type system than I do needs to weigh in on this, but I'm not sure= if this is currently possible in ISO C++.

An alte= rnative might be something like

std::container_from_value_type<ValueType, Container=3D= std::vector<ValueType>>
std::container_from_iterator<Iterator,Container=3Dstd::vector<s= td::remove_pointer_t= <Iterator<= span style=3D"color: #660;" class=3D"styled-by-prettify">>>

-Ray

--
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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/00dbc427-c520-42f8-b92d-6c12d600483f= %40isocpp.org.
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