220 14513 article Path: news.gmane.org!not-for-mail From: Benjamin Lindley Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Range-based if Date: Wed, 12 Nov 2014 17:43:53 -0800 (PST) Lines: 58 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_976_775498106.1415843033974" X-Trace: ger.gmane.org 1415843044 2493 80.91.229.3 (13 Nov 2014 01:44:04 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 13 Nov 2014 01:44:04 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDI7THWOWMDRBWUZSCRQKGQERIZ5BLA@isocpp.org Thu Nov 13 02:43:56 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ig0-f199.google.com ([209.85.213.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XojS0-0000K0-3k for gclcip-std-proposals@m.gmane.org; Thu, 13 Nov 2014 02:43:56 +0100 Original-Received: by mail-ig0-f199.google.com with SMTP id hn18sf20548563igb.6 for ; Wed, 12 Nov 2014 17:43:55 -0800 (PST) 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=c/nW0q7rWju5JZyNz8++CYspj1EhcpMT+fyqgOLQw8w=; b=y0atWBmqN2BGKAgzPYnzlEPQbIe985K4jU2JUV2eubrvIXAuBT32eAMK99Qi1AgWhy MfhiPbjqSNVWrOq1Q4atfwti5oVrcptCDoHJGBpVP5oVRWvbjJDmRY/2JiRCHOoilYzz xLdWx1NIQzfp7xdjkUNNAzA7qk6e/y8TzL+NZY2rMH0j2qKJTJPI1hTDHcLSrVuYhcev WZ1+r4cnjWg5dEPrIomsM6x4W4VPmVJrAp9TL5JxOafMIrn7Fg2ojRSm5UNS8B/rJrWA xEC6BvzEhjwtQKkihHZrzcl6AD4PWLkZ1bJkepuXJKMnRus4Zv169N7uDZ3mmSyn71Td 6L1w== 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=c/nW0q7rWju5JZyNz8++CYspj1EhcpMT+fyqgOLQw8w=; b=ADt3O2Nsv2wSHfOoZHVUR5dGCIikDYum2aFzsvVNkx/GO7a9kKGMYOF3U9ejSyyHVT STWmZxIhSg47xRf9y7af+30IMeKs4bdvve02450hCKeUdV3k+UhBY5XfGYq6Zzf+iKj3 VRHElOYwEkw28rynVAGF6QsACeaRXzeKSTTD1qejLzNCNFMnFo/SlerFsOIofgtPsfW6 Ts4U7MC892Iov2VwhIhW/P+XNRGulfzn5k8Pb9e6wioCPmnEcPDwzQN3dLWQbU+bz+u1 Q/OD4k9Cbs42shC2e0UWHV330w5s0eO1hyP6p2Qyo1en/9W58RENeYffjteXpTUvqLhv Y2dg== X-Gm-Message-State: ALoCoQmI9fLng+INew+nTV1vFEqhg1TUwP/b48gpaUO8uuFtKKy8RyDwEGQLVxZ/khHFF9SoiyIv X-Received: by 10.43.6.67 with SMTP id oj3mr47850705icb.0.1415843035460; Wed, 12 Nov 2014 17:43:55 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.182.134.137 with SMTP id pk9ls1209532obb.67.gmail; Wed, 12 Nov 2014 17:43:54 -0800 (PST) X-Received: by 10.182.22.201 with SMTP id g9mr717obf.24.1415843034762; Wed, 12 Nov 2014 17:43:54 -0800 (PST) In-Reply-To: X-Original-Sender: benjameslindley@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:14513 Archived-At: ------=_Part_976_775498106.1415843033974 Content-Type: text/plain; charset=UTF-8 On Tuesday, November 11, 2014 8:39:34 PM UTC-6, Brent Friedman wrote: > > > auto first_or_null(auto range) -> decltype(&range.begin()) > > This assumes pointers, which while addressing some use cases it isn't > sufficient for the general case. > > What case does it not handle? And what exactly do you mean by "This assumes pointers"? It doesn't assume that the iterators are pointers, if that's what you mean. -- --- 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/. ------=_Part_976_775498106.1415843033974 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


On Tuesday, November 11, 2014 8:39:34 PM UTC-6, Br= ent Friedman wrote:
> = ;auto first_or_null(auto range) -> decltype(&range.begin())
This assumes pointers, which while addressing some use ca= ses it isn't sufficient for the general case.


What case does it not handle? And what exactly do you me= an by "This assumes pointers"? It doesn't assume that the iterators are poi= nters, if that's what you mean.

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