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=0.7 required=5.0 tests=BAYES_00,INVALID_DATE,
	MSGID_SHORT,REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no
	version=3.4.4
Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!ucsd!pacbell.com!lll-winken!cs!erickson
From: erickson@cs.nps.navy.mil (David Erickson)
Newsgroups: comp.lang.ada
Subject: limited private types, "=" operator
Message-ID: <1152@cs.nps.navy.mil>
Date: 1 Aug 90 18:47:23 GMT
Reply-To: erickson@cs.nps.navy.mil (David Erickson)
Organization: Naval Postgraduate School, Monterey CA
List-Id: <comp.lang.ada>

Is there any way to define "=" for a limited private type which is an
access type (which may be null)?  The problem arises trying to test for
null without producing an infinitely recursive definition.

The only solution that I am aware of is to use UNCHECKED_CONVERSION to
retype the access type during the test for null, but this is a hack.
Is there a cleaner solution?

Thanks -

	Dave Erickson