220 33686 article Path: news.gmane.org!.POSTED!not-for-mail From: Bo Persson Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: string_view for fstream::open() Date: Tue, 8 Aug 2017 19:51:47 +0200 Lines: 47 Approved: news@gmane.org Message-ID: References: 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 1502214721 9968 195.159.176.226 (8 Aug 2017 17:52:01 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 8 Aug 2017 17:52:01 +0000 (UTC) User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCZ6RLW3UIKBBP7UU7GAKGQEZ76IZRI@isocpp.org Tue Aug 08 19:51:56 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wm0-f70.google.com ([74.125.82.70]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1df8fb-0002Iv-Mu for gclcip-std-proposals@m.gmane.org; Tue, 08 Aug 2017 19:51:55 +0200 Original-Received: by mail-wm0-f70.google.com with SMTP id i187sf5445533wma.15 for ; Tue, 08 Aug 2017 10:52:02 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1502214722; cv=pass; d=google.com; s=arc-20160816; b=xekkdrH5zIifCyk7dGX7BKvhcvGHKA0dAJ4YYY1+Y0wlOc9dMnOyyosNidA48k4ncK wbmnishep0tUvcE+D+ZggWHdWnuVXbP1JJ87cMaB7J3Kz0lLbJ10scTYuAFDjvTopNjh 2T32ec8yOf9narGwEByETd7xEqxCoNihxizWJVrmajFXoichbTWiq/4tJ6w8G9q4f1Qh 0Iz2uUY64Crr6ie1FByD/4wlIHTFxt4Rqtei92oL/TSg+36JEerHuuZkwMNsFdQwJCHj nue7MAQIwT5GsMbD2TO09CrgdkrN7/qFToz5hz0L+CxaE/g397jZ97Q1Z1rt49Bw2NO2 hCXA== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-unsubscribe:list-subscribe:list-archive:list-help:list-post :list-id:mailing-list:precedence:reply-to:content-language :in-reply-to:user-agent:mime-version:references:message-id:lines :date:subject:from:to:arc-authentication-results :arc-message-signature:dkim-signature:arc-authentication-results; bh=LkB1ejvG06VFyKXZFJ6QERrNGgvzcha7e7PxsB7KTKc=; b=bxIY+Mljjd86ByBx5X1X8/gjh/asl+ZnA9sDy0HBMIyjdEft7XWcmVmimLUWgu6t6T TPg6VWF8Vu7d/V73boAZskHLzctQwxSdtFo+G0dYtTARLbsezQkwZNMQBfDpcCoUmwk6 5ms7+hdRAiHvhQUz2cPw8Nofos1V/GBXP12rIu74/ieozcjOHll+ppXtZTL/dxF+Cu52 lZS1+YSTAnbrVpguBD2dp/K7UzoZspuHdoRBP4htokyKkpMF9kBdTLmsIa9s8sxXkKoC /Gf9dzLuXCM1JEvuZKGCwwNpBYKvBdp8Ot38bKc//4+qkaiNwOk/PpLUowjPsmtwYAtg sLjQ ARC-Authentication-Results: i=2; 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 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:content-language:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe; bh=LkB1ejvG06VFyKXZFJ6QERrNGgvzcha7e7PxsB7KTKc=; b=mjYnd+8Edx4kyyYR8txGA425CPzzsjRCY0S2p2dZJHl1BAmSidgRynEFgUu7l6TcOX eLEaTVVi19dT3XAenqinTJkrlX0LC3eLds1lUAlqq9SL3RZTTJyfXjnRK7OCOUm3Do1C xL0qsLnlFjdbj1AbBjn+4bUhTYgcoS5Rh0g6NeTtVFeOmEnEmI96ZlXJrUcUH+k9lgLN +ZbYJJKq5S6wSJuQcCNFAqcQPZlJ5H+/DDLS1x/INGGqJ/mS2gkiGIr7PAF4hJWbaB0+ hzSsJhGeCz1hjcaybIdhkkYIqYXtsTR+77qeVGZV0NH5QQ4c0WAsSY4oKrfq3LJbDTB2 IxTw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:to:from:subject:date:lines:message-id:references :mime-version:user-agent:in-reply-to:content-language :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=LkB1ejvG06VFyKXZFJ6QERrNGgvzcha7e7PxsB7KTKc=; b=YS7dGXHvFiV9PqooREnASROshGBTXfl1r6wjxCch2HKN3UkjgNJi04YVf97McakQYh 0kq15H7hseVq1ZVw/wwWR4x+v7pfEeUp7MasF/SxwNAyAC1pRyvSRGrURl4Jz5ko+Hkm 6sWJik8xgVW49ax9qWHfpU2JhvmhwghBdvUHrv0LmYQ3Nktb/S9SiIlW9Rp9DTnnm4T1 lLeG8U+SpqeIBgRC037gyvNk0bIzO8LzDpC55kIeMX3neCD+QmkHnGpSxdz3rEpwU7Jb hlNndK+tqcbppKhVo3b6vAbtKL6gETFJHhvk+1k3keQahr1ZfoV35cfPK1gt7VbIXi00 X-Gm-Message-State: AHYfb5gj/Hn3/Wr7KaPGe26TytFgefxP0QkhM5S+KvOW1jTXFKx7eLIn v87o0tkcTangfA== X-Received: by 10.28.11.144 with SMTP id 138mr723706wml.23.1502214722036; Tue, 08 Aug 2017 10:52:02 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.25.206.68 with SMTP id e65ls319492lfg.13.gmail; Tue, 08 Aug 2017 10:51:59 -0700 (PDT) X-Received: by 10.46.87.81 with SMTP id r17mr1980353ljd.188.1502214719424; Tue, 08 Aug 2017 10:51:59 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1502214719; cv=none; d=google.com; s=arc-20160816; b=uYOzeZFrLnDcrfL/Htbz4mx/ks5RPEPDHSSRDPRNQk3+IvMlGC0lyXIxmYjlPv9fXy sPbvxveJxZHcJxXQbxJy1AcGm6EOrHeoS31D3DTgwQuALSKBcGNsq5LVMiHOMtEvKPRZ e0Ba0Eqy8q9+CE85kuX8Xli3LODQRzagtTEPuz3MmebMuttGWkByU4YPCESEc64Y2Chh R+eJsZyQrFjjE7YAfpdp6q+bUMdyg/zxZJgrpW+60gKUPOggBVQwZ0XtdmVsZVkfSqxU maNNbuqTOSX+t3sEmcMkoSPqXY+AQt4NpNuUTlR3+dwaJCFDRdsfnJq2mDLyh0Q+T1N/ 8k6g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-language:in-reply-to:user-agent:content-transfer-encoding :mime-version:references:message-id:lines:date:subject:from:to :arc-authentication-results; bh=kVzyWz+//l4dpIaDPwbZp5wLyIEHTYumu9nzV0Vty1w=; b=jDEpCClG0cz/JiMQpYHjQktLu/j4h+6Lm0t3Fm53wluL9S2y46cb+3eK6afZVund+7 aIOXVBqk4EeRKlZF+1A0tLct4YzbFgjpbp0bRvt4zv/8KmWU4ngJf1RsyeVnmtmzT+iF xXpHnXTNob0gcYFuczie2jBkDb5mJ3E+hR7RBWj+wGqO5Roa1s8CmCVAMLfuU9sLujc/ td+jcXGtyFQnDKOe3dlX8Dy4XKemkvr9GaCWFZf36PEPCaopWa7yH5N0lQOr/ULcaExy bKrZxbB1WzwlmSJc7xtGTVvnVvIGmiddu5XR+nNurM0cdvBu4XkgRCNcOFLJzlU6LuUe FdVQ== ARC-Authentication-Results: i=1; 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 Original-Received: from blaine.gmane.org ([195.159.176.226]) by mx.google.com with ESMTPS id 25si799324ljc.405.2017.08.08.10.51.59 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 08 Aug 2017 10:51:59 -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 1df8fX-00026y-85 for std-proposals@isocpp.org; Tue, 08 Aug 2017 19:51:51 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 40 Original-X-Complaints-To: usenet@blaine.gmane.org In-Reply-To: Content-Language: sv 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:33686 Archived-At: On 2017-08-08 19:46, Julian Watzinger wrote: > I'd like to propose a simple addition to std::basic_fstream: > > Currently, there's two overloads for std::basic_fstream::open. > > | > voidopen(constchar*filename, > ios_base::openmodemode =ios_base::in|ios_base::out); > > > > > > voidopen(conststd::string > &filename, > ios_base::openmodemode =ios_base::in|ios_base::out); > > | > > That means that when making extensive use of string_view, I'd have to > create a temporary std::string to open a filestream in a safe way. I > suggest adding a third overload: > > | > voidopen(conststd::string > _view &filename, > ios_base::openmodemode =ios_base::in|ios_base::out); > | > > plus an addition overload for this in the constructor. It would require > the same addition to std::basic_filebuf::open. From what I can tell, it > looks feasable. Any objections/further suggestions? > One objection is that the file name is supposed to be a nul-terminated string. The string_view is not required to be that. 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/omctnb%246nf%241%40blaine.gmane.org. .