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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Issue with GNAT GPL 2009 and GtkAda
Date: Fri, 26 Jun 2009 16:40:58 -0500
Organization: Jacob Sparre Andersen
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Date: 2009-06-26T16:40:58-05:00
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"Alex R. Mosteo" <alejandro@mosteo.com> wrote in message 
news:7ajfrgF1vdsnlU1@mid.individual.net...
...
>> declare
>>    Ptr : access T := new T;
>> begin
>>    ...
>>    External_Ptr := Ptr.all'Uchecked_Access; -- Copy the pointer
>>    ...
>> end;  -- Now External_Ptr is dangling, because the object is freed.
>
> If I understand correctly, this is because the type of Ptr goes out of
> scope?
>
> I strongly suspect that Gnat does not behave this way, but I should test 
> it.

Gnat would be wrong if it does *not* behave this way. (Janus/Ada has this 
bug currently.) The master of the anonymous access type is the declare 
block, and it has to be finalized at the end of the scope. I suppose you 
could leave the memory around, but the object has to be finalized (as 
Dmitry's example shows).

                        Randy.