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=ham
	autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,3849a7e484f56749
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2002-07-11 13:56:56 PST
Path: archiver1.google.com!postnews1.google.com!not-for-mail
From: adam@irvine.com (Adam Beneschan)
Newsgroups: comp.lang.ada
Subject: Re: generic packages
Date: 11 Jul 2002 13:56:55 -0700
Organization: http://groups.google.com/
Message-ID: <b4682ab7.0207111256.2550514c@posting.google.com>
References: <3D2ADF27.8070502@wanadoo.fr> <MyMW8.135990$Uu2.30054@sccrnsc03>
 <3D2D8B01.9040303@wanadoo.fr>
NNTP-Posting-Host: 66.126.103.122
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
X-Trace: posting.google.com 1026421016 24556 127.0.0.1 (11 Jul 2002 20:56:56
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: 11 Jul 2002 20:56:56 GMT
Xref: archiver1.google.com comp.lang.ada:27011
Date: 2002-07-11T20:56:56+00:00
List-Id: <comp.lang.ada>

Sami Evangelista <sami.evangelista@wanadoo.fr> wrote in message news:<3D2D8B01.9040303@wanadoo.fr>...
> thank you for your response, but does the following code compile?
> 
> =======================================================
> --file generic_set.ads
> 
> generic
>       type Element is private;
>       with function "=" (E1, E2 : in Element) return boolean;
> package Generic_Set is
>       type Set_Record is private;
>       type Set is private;
>       generic
>            with package a_set is new generic_set(<>);
>            with package b_set is new generic_set(<>);
>            with function a_to_b(A : in a_set.element) return 
> 
>                                                b_set.element;
>       function a_set_to_b_set(the_set : in a_set.set) return b_set.set;
> 
> 
> private
>       type Set is access Set_record;
>       type Set_record is record
>          El : Element;
>          Others_Els : Set;
>       end record;
> end Generic_Set;
> =======================================================
> 
> Sami Evangelista

The code, as you've written it, is illegal.  Within the declarative
region of Generic_Set, if you use the name Generic_Set, it denotes the
*current* *instance* of the generic, rather than the generic itself. 
Thus, since Generic_Set doesn't denote a generic in this context, it
can't be used where a generic is expected in this formal package
declaration:

    with package a_set is new generic_set(<>);

See 8.6(18), 12.1(11).

				-- Adam