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,FREEMAIL_FROM
	autolearn=ham autolearn_force=no version=3.4.4
X-Google-Thread: 103376,c406e0c4a6eb74ed
X-Google-Attributes: gid103376,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!news1.google.com!news.glorb.com!news-xfer.newsread.com!nntp.abs.net!ash.uu.net!spool.news.uu.net!not-for-mail
Date: Tue, 31 Aug 2004 08:42:49 -0400
From: Hyman Rosen <hyrosen@mail.com>
User-Agent: Mozilla Thunderbird 0.7.3 (Windows/20040803)
X-Accept-Language: en-us, en
MIME-Version: 1.0
Newsgroups: comp.lang.ada
Subject: Re: ADA Popularity Discussion Request
References: <49dc98cf.0408110556.18ae7df@posting.google.com>
 <ba2f9c57.0408211523.389cf201@posting.google.com>
 <GVZVc.9513$3O3.1068@newsread2.news.pas.earthlink.net>
 <ba2f9c57.0408221618.475d5941@posting.google.com>
 <oZnWc.31328$9Y6.14222@newsread1.news.pas.earthlink.net>
 <e749549b.0408261308.70d9239c@posting.google.com>
 <cgn6sd$snk$2@a1-hrz.uni-duisburg.de>
 <e749549b.0408271022.47abd0e2@posting.google.com>
 <1198227.gWQ0keDDOY@linux1.krischik.com>
 <e749549b.0408302325.50587be2@posting.google.com> <qrg1hc.0l3.ln@skymaster>
In-Reply-To: <qrg1hc.0l3.ln@skymaster>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Organization: KBC Financial Products
Message-ID: <1093956169.632925@master.nyc.kbcfp.com>
Cache-Post-Path: master.nyc.kbcfp.com!unknown@nightcrawler.nyc.kbcfp.com
X-Cache: nntpcache 3.0.1 (see http://www.nntpcache.org/)
NNTP-Posting-Host: 204.253.250.10
X-Trace: 1093956169  2998 204.253.250.10
Xref: g2news1.google.com comp.lang.ada:3208
Date: 2004-08-31T08:42:49-04:00
List-Id: <comp.lang.ada>

Jean-Pierre Rosen wrote:
 > However, all other OO languages (that I know of) require
> *all* classes to be declared at library level.

Certainly neither C++ nor Java require this. I will occasionally
write the following C++ code, when I'm too lazy to do the right
thing and make a more widely reusable class.

     void some_func()
     {
         extern int some_global_a, some_global_b;
         struct restorer {
             int &sg, oldval;
             restorer(int &var, int newval) : sg(var), oldval(var) { }
             ~restorer() { sg = oldval; }
         };
         restorer rsga(some_global_a, 53);
         restorer rsgb(some_global_b, -1);
         // ...
     }

Java allows you to write "inner classes", even anonymous ones, at
pretty much any point in your code. They are often used to create
tiny class objects which implement an interface, as callbacks for
example. Something like this
     button.setClickCB(new INotify { void notify() { /* stuff */ } });