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Newsgroups: comp.lang.ada
From: porton@ex-code.com (Victor Porton)
Date: Mon, 13 Jan 2003 06:11:23 +0500
Organization: Extreme Code Software (http://ex-code.com)
Subject: Finalization of tagged types - problem
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Xref: archiver1.google.com comp.lang.ada:32950
Date: 2003-01-13T04:48:06+00:00
List-Id: <comp.lang.ada>

I have a non-limited tagged type (not derived from
Ada.Finalization.Controlled) Base.

I derive:

type State_Type is new Base with
   record
      -- ...
      Finalizer: Finalizer_Type(State_Type'Access);
   end record;

I want to add a component with back-reference derived
from Ada.Finalization.Controlled or
Ada.Finalization.Limited_Controlled for auto-finalization
of State_Type.

But

type Finalizer_Type(State: access State_Type) is
   new Ada.Finalization.Controlled with null record;
   
Compiler: "Access discriminant are allowed only for limited types".

Can be done something among the obvious but imperfect
solutions: 1. make Base controlled. 2. make Base limited
and derive Finalizer_Type from Limited_Controlled instead?