From mboxrd@z Thu Jan  1 00:00:00 1970
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From: bobduff@world.std.com (Robert A Duff)
Subject: Re: Abstract type derivation?
Date: 1996/04/10
Message-ID: <DpnCGG.46M@world.std.com>#1/1
X-Deja-AN: 146720164
references: <4kb0hb$k87@dfw.dfw.net>
organization: The World Public Access UNIX, Brookline, MA
newsgroups: comp.lang.ada
Date: 1996-04-10T00:00:00+00:00
List-Id: <comp.lang.ada>

In article <4kb0hb$k87@dfw.dfw.net>, David Weller <dweller@dfw.net> wrote:
>I want to create an abstract type that is derived from Controlled
>(which is itself abstract).

    type Queue is abstract new Controlled with private;
                  ^^^^^^^^

Also, to prevent objects from being created, consider using unknown
discriminants.

- Bob