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From: Pascal Obry <p.obry@wanadoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Question about OO programming in Ada
Date: 03 Dec 2003 10:29:17 +0100
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Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> writes:

> Easily if the target is controlled. Consider this:
> 
> with Ada.Finalization;
> package A is
>    type Misty is
>       new Ada.Finalization.Limited_Controlled with null record;
>    procedure Finalize (X : in out Misty);
> end A;
> 
> with Text_IO; use Text_IO;
> package body A is
>    procedure Finalize (X : in out Misty) is
>    begin
>       Put_Line ("finalized!");
>    end Finalize;
> end A;
> 
> with A;  use A;
> with Text_IO;  use Text_IO;
> procedure Test is
> begin
>    Put_Line ("Begin of a scope");
>    declare
>       type Pointer is access all Misty;
>       X : Pointer;
>    begin
>       X := new Misty; -- This is not dangled!

Of course it is.

>    end;
>    Put_Line ("End of the scope");
> end Test;
> 
> This program should print;
> 
> Begin of a scope
> finalized!
> End of the scope

And it has a nice memory leak.

> All controlled objects allocated by the allocator new, being not
> explicity destroyed using Unchecked_Deallocation, will be destroyed
> upon finalization of the access type.

There is no magic done by Finalize here ! Finalize gives a chance to the
component implementer to do the memory deallocation for the end user. That's
all.

Pascal.

-- 

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--| Pascal Obry                           Team-Ada Member
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