220 35857 article Path: news.gmane.org!.POSTED!not-for-mail From: Nicol Bolas Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: What happened to N4282 Date: Sun, 10 Dec 2017 14:07:54 -0800 (PST) Lines: 74 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: multipart/mixed; boundary="----=_Part_5549_360282825.1512943674644" X-Trace: blaine.gmane.org 1512943674 29721 195.159.176.226 (10 Dec 2017 22:07:54 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 10 Dec 2017 22:07:54 +0000 (UTC) Cc: bobfang1992@gmail.com To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCEKFTV6ZUMBBO7AW3IQKGQEUY5LWQY@isocpp.org Sun Dec 10 23:07:50 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ua0-f198.google.com ([209.85.217.198]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eO9lG-0007bc-78 for gclcip-std-proposals@m.gmane.org; Sun, 10 Dec 2017 23:07:50 +0100 Original-Received: by mail-ua0-f198.google.com with SMTP id p9sf10929446uaj.17 for ; Sun, 10 Dec 2017 14:07:57 -0800 (PST) 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=ZH9ukzqNJcUm8UZz1eZ+WOQ76tGvnBuTilxNsUWkcv0=; b=wifXP2Htgy3BVE1+T0KVTos2woEI4sQA2/4WANofmmD0lUUeNKt3cWCbijk9c0MySW dIMA1vb2PDqKUjl39+TVFi/yYVI7O4bbcgui0F3R7mauBXqjvSTpKPtPyZ+8kDrl4BLQ cDfjBm3XpFnQ6OfgVplqQEYZd789ApB24lMTlfonTaejC7e7GKkPT/eodsmEs9d23oCc XQs5nEt8z4Z1hlDXfixHerCsBo6OduCr+Rk55G4s5d6cMlQIjYO248jnt595Ue6djq37 zr3wz4M0LxY2IfVBEEQTdmKAvg9pWxPOHymwFqzz+ClZMejxm+ebUggwbXaMAiGOaRTF dyQQ== 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=ZH9ukzqNJcUm8UZz1eZ+WOQ76tGvnBuTilxNsUWkcv0=; b=YmCULheWgFXTixjw2nbpTgsPxfz6/C4kg2piXDaCtFqViT7pu+s0nQljYxmMakPseO lt68HqE0SB3mnG9iucGlXRk6HFiRI5vxb9gBO4y4rHyfQoY3pBsE/4pSDZUZq+SEjkKc I5+n61mPrX3enX8uLf2dwo8USdDba9FW6e9xhmbQGObhFcPOvmafESNUJ8iqmFC/jJjL lhGUQh0tifiLwKA9Q4xNYFWSAV12wdeIkhbftGRV9o/QsC6n8kPi5jt36am9y0ublgVK EtaE9xMggledoaRFFYTBxzHuxclsaftG96T4iAyH9ZgPnD2vFayX1ed9/9mhMSnUN+3j z64w== 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=ZH9ukzqNJcUm8UZz1eZ+WOQ76tGvnBuTilxNsUWkcv0=; b=sr4FnI6FY2OhF60tux9aJisJII/MZUEZIt/BG5NAbITGkUKVR8JocFIKWIfvQFTZmb z5XbWL4pmMf7Ur4Xo2+neXavneQwav8g0x3Oi4Ecui9aR6+Au6/LKJNvry6RiQl14i9C mYyzeVEx0RxK8EPorBJb0a8MxENkWm5zosYd8HLK4jVnXxhGhzJfGLeUI0LQ6w9jEN7B KdQ7JiQtcMnbsrUyd9jyUPimfq2RKkfOlXtkTYYpVG8soP2Ip/pOM1eg4sxZXqSF7hth Jjhsu1Do8yAZAVJFDO+yJ/qmXc2uP7A1yIrgthtJ0zZ0ALd7RY7fEgqrQ7Z6MMVqQrRx tnnQ== X-Gm-Message-State: AKGB3mJm9qbVG6Lxb/e2nSQOcAxD5o34GRkRQG4lh2MT96P1bYFqnYx4 DVydo4RVg8EFI9klsEyrNwJT+w== X-Google-Smtp-Source: AGs4zMZQBfXpOZmedTSkNHO7VIhZAWfEDBgXcITzwXUCTVdmrwdBjGq8vrA+ZPX2H6mhB+2zgx44FQ== X-Received: by 10.159.56.45 with SMTP id p42mr10614894uad.83.1512943677370; Sun, 10 Dec 2017 14:07:57 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.31.65.146 with SMTP id o140ls2023286vka.3.gmail; Sun, 10 Dec 2017 14:07:55 -0800 (PST) X-Received: by 10.31.159.211 with SMTP id i202mr1972941vke.3.1512943675132; Sun, 10 Dec 2017 14:07:55 -0800 (PST) In-Reply-To: X-Original-Sender: jmckesson@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:35857 Archived-At: ------=_Part_5549_360282825.1512943674644 Content-Type: multipart/alternative; boundary="----=_Part_5550_1483266997.1512943674644" ------=_Part_5550_1483266997.1512943674644 Content-Type: text/plain; charset="UTF-8" It was added to the Library Fundamentals TS v3. Granted, I hope it never sees the light of day outside of that TS. The C++ Core Guidelines provides more reasonable ways to deal with this. In recognition of the fact that naked pointers will never go away, we simply assume that all naked pointers: 1: are non-owning. 2: point to a single object. Basically, naked pointers are treated like a hypothetical `optional`. If you want an owning pointer, you use a smart pointer or, if you cannot properly encapsulate the ownership, `gsl::owner`. If you want a non-owning array, you use `gsl::span`. People are going to use `T*` for non-owning pointers; there's no getting around that. We already have one way to spell that; we don't need a second one. > -- 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/fd278536-7104-4aa8-a0fd-bb9788e7c0aa%40isocpp.org. ------=_Part_5550_1483266997.1512943674644 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
It was added to the Library Fundamentals TS v3.
=

Granted, I hope it never sees the light of day outside = of that TS. The C++ Core Guidelines provides more reasonable ways to deal w= ith this. In recognition of the fact that naked pointers will never go away= , we simply assume that all naked pointers:

1: are= non-owning.
2: point to a single object.

Basically, naked pointers are treated like a hypothetical `optional<T&= amp;>`. If you want an owning pointer, you use a smart pointer or, if yo= u cannot properly encapsulate the ownership, `gsl::owner<T>`. If you = want a non-owning array, you use `gsl::span<T>`.

=
People are going to use `T*` for non-owning pointers; there's no g= etting around that. We already have one way to spell that; we don't nee= d a second one.

--
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
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/fd278536-7104-4aa8-a0fd-bb9788e7c0aa= %40isocpp.org.
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