220 38062 article Path: news.gmane.org!.POSTED!not-for-mail From: Phil Bouchard Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Fornux C++ Superset - Forward Declarations of Nested Structures Date: Thu, 10 May 2018 19:03:25 -0400 Lines: 47 Approved: news@gmane.org Message-ID: References: <34fa23ed-1fab-44d5-92ab-217067b68225@isocpp.org> <75fb8736-b92a-480f-9a36-310b3e03b131@isocpp.org> 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 Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1525993289 30012 195.159.176.226 (10 May 2018 23:01:29 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 10 May 2018 23:01:29 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCAYTFXFZMBBBR472PLQKGQEMCGOSRI@isocpp.org Fri May 11 01:01:25 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lf0-f69.google.com ([209.85.215.69]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fGuYv-0007iT-1S for gclcip-std-proposals@m.gmane.org; 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Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1fGuYr-0007fd-MN for std-proposals@isocpp.org; Fri, 11 May 2018 01:01:21 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 37 Original-X-Complaints-To: usenet@blaine.gmane.org In-Reply-To: <75fb8736-b92a-480f-9a36-310b3e03b131@isocpp.org> Content-Language: en-US X-Original-Sender: philippeb8@gmail.com 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; dmarc=fail (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org 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:38062 Archived-At: On 05/02/2018 07:26 AM, Phil Bouchard wrote: > Unless we bring the notion of "partial declarations" and forward=20 > declarations of nested structures are made like this: >=20 > class X > { > =C2=A0 =C2=A0 struct A; > =C2=A0 =C2=A0 .... // ellipsis operator here > }; >=20 > X::A=C2=A0* p =3D nullptr; // error >=20 > class X > { > =C2=A0 =C2=A0 struct A; > =C2=A0 =C2=A0 void foo() > =C2=A0 =C2=A0 { > =C2=A0 =C2=A0 =C2=A0 =C2=A0 X::A=C2=A0* p =3D nullptr; // fine > =C2=A0 =C2=A0 } > }; >=20 > This way that would solve the access scope problem cleanly. Do we all agree this is a good solution? This could provide friend=20 declarations as well: class X { friend struct A; struct A; .... // ellipsis operator here }; Regards, -Phil --=20 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 e= mail 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/pd2ivq%24saf%241%40blaine.gmane.org. .