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: 103376,3e3b1c50b9a29c0b,start
X-Google-Attributes: gid103376,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!postnews.google.com!o13g2000cwo.googlegroups.com!not-for-mail
From: "Andrew" <andrew@carroll-tech.net>
Newsgroups: comp.lang.ada
Subject: Forwarding declaration?
Date: 1 Apr 2005 00:36:22 -0800
Organization: http://groups.google.com
Message-ID: <1112344582.787855.248880@o13g2000cwo.googlegroups.com>
NNTP-Posting-Host: 4.228.123.19
Mime-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
X-Trace: posting.google.com 1112344608 17233 127.0.0.1 (1 Apr 2005 08:36:48
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Fri, 1 Apr 2005 08:36:48 +0000 (UTC)
User-Agent: G2/0.2
Complaints-To: groups-abuse@google.com
Injection-Info: o13g2000cwo.googlegroups.com; posting-host=4.228.123.19;
   posting-account=Kq9unQ0AAADh_grEViI3JGqegXKDDjxt
Xref: g2news1.google.com comp.lang.ada:10208
Date: 2005-04-01T00:36:22-08:00
List-Id: <comp.lang.ada>

I have need of a forwarding declaration.  How do I do that in Ada?

--- example1 ---
type Boob is record
    Avar : A_Ptr;
end record;
type Boob_Ptr is access all Boob;

task type A(booby: Boob_Ptr) is
   . . .
end A;
type A_Ptr is access all A;
------------------

compiler says (and I say) that A_Ptr is undefined for Boob.

Now if I could use a temporary placeholder for A_Ptr (a forwarding
declaration) then the compiler and I would be happy.

--- example2 ---
-- forwarding declaration
temporary declaration of A_Ptr;

type Boob is record
    Avar : A_Ptr;
end record;
type Boob_Ptr is access all Boob;

task type A(booby: Boob_Ptr) is
   . . .
end A;
type A_Ptr is access all A;
------------------

Thanks,

Andrew