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From: d96andgi@dtek.chalmers.se (Anders Gidenstam)
Subject: How to make a generic controlled type?
Date: 1999/09/24
Message-ID: <7sg9cg$mvm$1@nyheter.chalmers.se>#1/1
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X-Trace: nyheter.chalmers.se 938191056 23542 129.16.30.75 (24 Sep 1999
 16:37:36 GMT)
Organization: Chalmers University of Technology
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NNTP-Posting-Date: 24 Sep 1999 16:37:36 GMT
Newsgroups: comp.lang.ada
Date: 1999-09-24T16:37:36+00:00
List-Id: <comp.lang.ada>

Hello!

I'm trying to make a generic list package, and since I implement 
the list as a linked list I want to use a controlled type for it to prevent 
memory leaks. However GNAT (and I assume Ada) doesn't allow me to declare 
a controlled type inside a generic package. So I wonder if someone has a 
nice solution to this problem.   

with Ada.Finalization;

generic
   type Element_Type is private;

package List is

   type List is new Ada.Finalization.Limited_Controlled with private;

   -- Insert E at the current location.
   procedure Insert (L: in out List;
                     E: in     Element_Type);
...


/Anders
--------------------------------------------
"A well-written program is its own heaven; 
 a poorly-written program is its own hell."
  - The Tao of Programming