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=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID
	autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,28b389d4503cb555
X-Google-Attributes: gid103376,public
From: "Matthew Heaney" <matthew_heaney@acm.org>
Subject: Re: generic package dilemma
Date: 1999/11/19
Message-ID: <383569db_2@news1.prserv.net>#1/1
X-Deja-AN: 550567265
Content-transfer-encoding: 7bit
References: <80u48b$ghr$1@bunyip.cc.uq.edu.au> <3832e27f_1@news1.prserv.net>
 <3832E75D.5B1BA719@mail.com> <383319e8_4@news1.prserv.net>
 <3833F615.5AD7166C@mail.com> <383442e1_1@news1.prserv.net>
 <383510EA.9DFEE8B6@mail.com>
Content-Type: text/plain; charset="US-ASCII"
X-Complaints-To: abuse@prserv.net
X-Trace: 19 Nov 1999 15:16:43 GMT, 32.101.8.40
Organization: Global Network Services - Remote Access Mail & News Services
Mime-version: 1.0
Newsgroups: comp.lang.ada
Date: 1999-11-19T00:00:00+00:00
List-Id: <comp.lang.ada>

In article <383510EA.9DFEE8B6@mail.com> , Mats Weber <matsw@mail.com>  
wrote:

> No. I totally agree with Robert Dewar here: never use Elaborate, use
> Elaborate_All instead.

OK, I'm convinced.  Never use pragma Elaborate; always use pragma
Elaborate_All.  Either Norm's book is wrong, or I misinterpreted what he
said (probably the latter).


> Your approach of using Elaborate at each level, besides being hard to
> enforce on a large project, puts unnecessary constraints on the
> elaboration order: in our example, where P2I instantiates P2
> instantiates P1, valid elaboration orders are: P1, P2, P2I and P2, P1,
> P2I. You are unnecessarily enforcing the first one with your approach.

I just assumed that whenever you instantiate a package (inside another
package), that you have to pragma Elaborate_All the generic unit.

But you seem to advocate only a conditional application of this
guideline.  When specifically do you recommend using Elaborate_All,
versus not needing to bother?


--
It is impossible to feel great confidence in a negative theory which has
always rested its main support on the weak points of its opponent.

Joseph Needham, "A Mechanistic Criticism of Vitalism"