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From: =?ISO-8859-1?Q?Hibou57_=28Yannick_Duch=EAne=29?=
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Newsgroups: comp.lang.ada
Subject: Re: Initialization and Finalization of limited object "returned" by a
	function
Date: Thu, 11 Feb 2010 20:27:11 -0800 (PST)
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Date: 2010-02-11T20:27:11-08:00
List-Id: <comp.lang.ada>

Back here (I was busy at some intermediate things).

It seems to me, there is indeed a GNAT bug here, as this next sample
which solve the trouble shows. With G, initialization and finalization
are done just like I was expecting.

procedure G is
   -- Variation from G : the protected
   -- type is wrapped in a limited record
   -- which is handle the derivation of
   -- the Limited_Type.
   -- Observations : Entity is initialized
   -- and Finalized as expected (like in A),
   -- and its component of Protected_Type is
   -- initialized before Entity is Initialized
   -- (as expected) and Finalized after
   -- Entity is Finalized (also as expected).
   -- It seems to me (unless there are contradictory
   -- interpretation of these observations), that
   -- a bug is confirmed here, and the construct
   -- provided here is a possible workaround.

   package P is
      type Limited_Type is limited interface;
      subtype Limited_Class is Limited_Type'Class;
      function New_Limited return Limited_Class;
   end P;

   package body P is
      protected type Protected_Type is end;

      protected body Protected_Type is end;

      type Derived_Limited_Type is
         limited new Limited_Type with
      record
         Wrapped_Protected_Item : Protected_Type;
      end record;

      function New_Derived return Derived_Limited_Type is
      begin
         return R : Derived_Limited_Type do
            null;
         end return;
      end;

      function New_Limited return Limited_Class is
      begin
         return R: Limited_Class := New_Derived do
            null;
         end return;
      end;
   end P;

   Entity : P.Limited_Class := P.New_Limited;

begin
   null;
end G;