220 27592 article Path: news.gmane.org!.POSTED!not-for-mail From: Bo Persson Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: this in non-member functions Date: Thu, 4 Aug 2016 11:14:50 +0200 Lines: 49 Approved: news@gmane.org Message-ID: References: <2351486.cE391vEbrj@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; format=flowed X-Trace: blaine.gmane.org 1470302118 4580 195.159.176.226 (4 Aug 2016 09:15:18 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 4 Aug 2016 09:15:18 +0000 (UTC) User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCZ6RLW3UIKBBG4PRS6QKGQEQ2BYYAI@isocpp.org Thu Aug 04 11:15:10 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wm0-f72.google.com ([74.125.82.72]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bVEk8-0000GU-41 for gclcip-std-proposals@m.gmane.org; Thu, 04 Aug 2016 11:15:08 +0200 Original-Received: by mail-wm0-f72.google.com with SMTP id l4sf142112173wml.0 for ; Thu, 04 Aug 2016 02:15:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=to:from:subject:date:lines:message-id:references:mime-version :user-agent:in-reply-to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=GSQ7sQavcT60869JSeb6buo4TKg6X7myRfox3MlxOak=; b=kJrLgnNdBynYXZF6i7sJr5Ie2V8hmUgfJLpC3sMJxSPbyMZH3em/rRCUz6Bg/S7pOg sMqThUzWswifagDfotahc7+mlRwcIelHy60UD+IdMI9+q2CFDf16CKTqCvLq99Biy8lO BhWm0ldcMY8yQeCgMlyOA5RTd2l+nWrZGg7mv+jK9W3QYjWC5T0nx5XrZ9KyyC3aN7w2 atuMCrzr7HNwTpc+1DXbXbJZl4q/34ml0CzA6pcMf5Fa5P8PQp99zszPG9o64wbjj2PC JRM2Te7Fd9B96wJrh2jGBTAePhMTsCbmjyo2y4sE16cj0PjSWTvAJh5gHR0uZmpCnCVJ 0AWg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:to:from:subject:date:lines:message-id:references :mime-version:user-agent:in-reply-to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=GSQ7sQavcT60869JSeb6buo4TKg6X7myRfox3MlxOak=; b=TPal6YcIBR4Jq608ogN+JKtWzS6f7YEGzXCdPTrjCiAjkHM9a/Q8gc9YBrnexCJ/BB qarU1lC3NxVK5i+66/iHsLqhqmll7uNcBo3n/H4Q+LYjdF9dqJnBQhCBlLz/3RP79jXh QWsNryryASlGct9NQXhctReztgg9JlJ+BQQN5D2ECMopPyI6i879bAfbCjbdYjK77x53 St5xAM0S+e6XfVTqA/I9SCPlWc9kDS//rjzm2TW9ZndlOW9MNHyTh5DPlW2SPD4BuTgH 7dGuGKuFYK0AerLRBIMMghAvUn/vs3rHGePgTw9fV9EpZ9A2LJ1hv/gZqKIJnB7HV7Z+ LReQ== X-Gm-Message-State: AEkoout03ZruKb9uzedVBypKpWcqamWTs3QaoYJUuF0rcWhkrJZ4GCNHA9ZBpQFpPPDVNg== X-Received: by 10.46.0.16 with SMTP id 16mr9830098lja.9.1470302108347; Thu, 04 Aug 2016 02:15:08 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.46.32.16 with SMTP id g16ls188663ljg.48.gmail; Thu, 04 Aug 2016 02:15:07 -0700 (PDT) X-Received: by 10.25.157.146 with SMTP id g140mr19203931lfe.172.1470302106998; Thu, 04 Aug 2016 02:15:06 -0700 (PDT) Original-Received: from blaine.gmane.org ([195.159.176.226]) by mx.google.com with ESMTPS id t14si5234356lfd.114.2016.08.04.02.15.06 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 04 Aug 2016 02:15:06 -0700 (PDT) Received-SPF: neutral (google.com: 195.159.176.226 is neither permitted nor denied by best guess record for domain of gclcip-std-proposals@m.gmane.org) client-ip=195.159.176.226; Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1bVEk4-00081p-69 for std-proposals@isocpp.org; Thu, 04 Aug 2016 11:15:04 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 42 Original-X-Complaints-To: usenet@blaine.gmane.org In-Reply-To: X-Original-Sender: gclcip-std-proposals@m.gmane.org X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 195.159.176.226 is neither permitted nor denied by best guess record for domain of gclcip-std-proposals@m.gmane.org) smtp.mailfrom=gclcip-std-proposals@m.gmane.org 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:27592 Archived-At: On 2016-08-04 10:49, D. B. wrote: > On Wed, Aug 3, 2016 at 10:04 PM, Thiago Macieira > wrote: > > On quarta-feira, 3 de agosto de 2016 14:37:14 PDT Viacheslav Usov wrote: > > void foo(A *this) { x = 1; } > > > > is equivalent to > > > > void foo(A *ptr) { ptr->x = 1; } > > Understood, but is this the only benefit? Is it worth the hassle for > saving a > few keystrokes? > > Also note that it's not a member function, so it can't access > protecteds and > privates of the object. > > > Agreed on both counts. Especially the latter, which hadn't occurred to > me yet - but I think is just another of the inconsistencies/ambiguities > I alluded to between 'this as object' and 'this as shortcut'. Whether or > not other refinements were made to resolve all of those, I think it's > guaranteed that a lot of people would end up confused... > Yes, I would definitely be confused by the sublety of the parameter name. int x; void foo(A* this) { x = 1; } // x is A::x void foo(B* that) { x = 1; } // which x is it now? void foo(C* htis) { x = 1; } // typo or intentional? Bo Persson -- 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/nnv12b%24okq%241%40blaine.gmane.org. .