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-Thread: 103376,aea4cc77526f5e4a
X-Google-Attributes: gid103376,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!news2.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!nx02.iad01.newshosting.com!newshosting.com!post01.iad01!news.cv.net!not-for-mail
Date: Tue, 26 Feb 2008 00:10:51 -0500
From: "John W. Kennedy" <jwkenne@attglobal.net>
User-Agent: Thunderbird 2.0.0.9 (Windows/20071031)
MIME-Version: 1.0
Newsgroups: comp.lang.ada
Subject: Re: Separate Compilation in Programming Languages
References: <FJDvj.10151$0o7.9092@newssvr13.news.prodigy.net>
 <wccr6f4y94q.fsf@shell01.TheWorld.com>
 <7xJvj.7420$Ru4.4246@newssvr19.news.prodigy.net>
 <wcc63wfpus7.fsf@shell01.TheWorld.com>
 <j6Yvj.2585$fX7.895@nlpi061.nbdc.sbc.com> <u3arjcxx3.fsf@STRIPCAPStelus.net>
 <5b9wj.4639$Mh2.1432@nlpi069.nbdc.sbc.com> <ulk5a8zcu.fsf@STRIPCAPStelus.net>
 <5Ekwj.10401$0o7.6822@newssvr13.news.prodigy.net>
 <uy799dama.fsf@STRIPCAPStelus.net>
 <%Ntwj.12620$Ch6.11402@newssvr11.news.prodigy.net>
 <uprulnd6u.fsf@STRIPCAPStelus.net> <ulk58of6r.fsf@STRIPCAPStelus.net>
In-Reply-To: <ulk58of6r.fsf@STRIPCAPStelus.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Message-ID: <47c39f6c$0$15196$607ed4bc@cv.net>
Organization: Optimum Online
NNTP-Posting-Host: 68.193.246.216
X-Complaints-To: abuse@cv.net
Xref: g2news1.google.com comp.lang.ada:20075
Date: 2008-02-26T00:10:51-05:00
List-Id: <comp.lang.ada>

Ray Blaak wrote:
> Ray Blaak <rAYblaaK@STRIPCAPStelus.net> writes:
>>> Perhaps.  But I still don't see how one can defer the dependency of a
>>> Java signature to the implementation of the Java class and prevent
>>> the need for recompiling the entire architecture when the signature of
>>> a parent class changes.   
>> Maybe the disconnect is here. Are you talking about how spec changes ripple
>> down, or are you talking about how body changes ripple down? Spec changes
>> affect clients and bodies, both in Java in Ada. Body (implementation) do not
>> affect clients that only refer to the spec, both in Java and Ada.
> 
> It also occurs to me to wonder if you were assuming the Java interface and
> implementation are in the same file. If so, the issues you say would indeed
> happen. 
> 
> But usually the interface and its implementations are in separate files, as
> per the usual Java rule of one class per file. That separation is what allows
> Java to have separate compilation.

Actually, this doesn't accomplish as much as you wish, in practice, as 
it will eventually be necessary to have a constructor for the real 
class, or else a static factory method.

-- 
John W. Kennedy
"The blind rulers of Logres
Nourished the land on a fallacy of rational virtue."
   -- Charles Williams.  "Taliessin through Logres: Prelude"