220 4404 article Path: news.gmane.org!not-for-mail From: Nicol Bolas Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Even more extended friend declarations Date: Tue, 14 May 2013 02:13:37 -0700 (PDT) Lines: 52 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_240_4585827.1368522817382" X-Trace: ger.gmane.org 1368522821 9054 80.91.229.3 (14 May 2013 09:13:41 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 14 May 2013 09:13:41 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCEKFTV6ZUMBBQ4AZCGAKGQEM4I5IUQ@isocpp.org Tue May 14 11:13:41 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ob0-f200.google.com ([209.85.214.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1UcBIj-0002Pe-2n for gclcip-std-proposals@m.gmane.org; Tue, 14 May 2013 11:13:41 +0200 Original-Received: by mail-ob0-f200.google.com with SMTP id ef5sf1083315obb.3 for ; Tue, 14 May 2013 02:13:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:x-beenthere:x-received:date:from:to:message-id :in-reply-to:references:subject:mime-version:x-original-sender :reply-to:precedence:mailing-list:list-id:x-google-group-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe :content-type; bh=BOxtL0fPDwerJpvEwYYCZEeB7oiC6HhDaLZ54ePeFdI=; b=H9658cS7KN+oxbvjPjg0xyQ7Eli+c77FNWqJS98at/KhIgeirlBslhp4GPJLqFyDHX QNO9rN2M98Y7PHisnX2QhXxLN1vPB819Z+K/zyFwQaU77EuFeeC0scURh17jqaHZ0gFc 4uwKGyP37ASSEXOACQchL17Fz4PMFXDKKfuwL5Ppa0vsMe/VXqE11F+P1CoAtPqETHzB tIkiWuFxNLUJzcETfQHvMTEyXH1gvIHbYs0ipabS5lIWc7XN+ma3jI4fjHFnUJYsFS7A IJ+njWymla1dOI5OuuJ7slc4afDJjfHgzx+UG8rDuc3awh556phXgAQYE4zFqlzVXM/S GVRw== X-Received: by 10.42.65.4 with SMTP id j4mr22638209ici.17.1368522819835; Tue, 14 May 2013 02:13:39 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.112.71 with SMTP id io7ls259658igb.3.gmail; Tue, 14 May 2013 02:13:38 -0700 (PDT) X-Received: by 10.50.29.17 with SMTP id f17mr193536igh.7.1368522818558; Tue, 14 May 2013 02:13:38 -0700 (PDT) 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:4404 Archived-At: ------=_Part_240_4585827.1368522817382 Content-Type: text/plain; charset=ISO-8859-1 Or you could just use dependency injection. That's pretty much the only way you can have transfer of private status between functions that are not directly known about at compile time. `allocate_shared` *could* have done this, if it were properly defined in terms of `allocator_traits::construct` instead of placement new. Your allocator object would be the dependency you inject, and the protection class is effectively on who's allowed to create your allocator objects. -- --- 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/?hl=en. ------=_Part_240_4585827.1368522817382 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Or you could just use dependency injection. That's pretty much the only way= you can have transfer of private status between functions that are not dir= ectly known about at compile time.

`allocate_shared` could ha= ve done this, if it were properly defined in terms of `allocator_traits<= A>::construct` instead of placement new. Your allocator object would be = the dependency you inject, and the protection class is effectively on who's= allowed to create your allocator objects.

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