From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=unavailable autolearn_force=no version=3.4.4 Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: Ada Alternatives to Unrestricted_Access Date: Wed, 7 Mar 2018 21:38:07 +0100 Organization: Aioe.org NNTP Server Message-ID: References: NNTP-Posting-Host: 0f5DjA3zWhpsGCvABLHXFQ.user.gioia.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@aioe.org User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 X-Notice: Filtered by postfilter v. 0.8.3 Content-Language: en-US Xref: reader02.eternal-september.org comp.lang.ada:50883 Date: 2018-03-07T21:38:07+01:00 List-Id: On 2018-03-07 21:11, Jere wrote: > function Iterate > (C : in Container) > return Iterator_Interfaces.Forward_Iterator'Class; > > and the generic formal for Container > > type Container is tagged private; > > I'm working with an existing code base, so complete overhaul is > not a great option. > > If it isn't a good idea, are there alternatives? [...] > Since the Container > implementation is unknown in the generic, I wasn't able to get a version > of the Rosen technique to work as an alternative (same constant vs > variable access problem). I am not sure I understand the problem. Why don't you pass a function Self along with the container type: generic type Container is tagged whatever; function Self (C : Container'Class) return not null access Container'Class; package Iterative_Mess is -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de