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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: in defense of GC
Newsgroups: comp.lang.ada
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Date: Mon, 5 Feb 2007 09:47:39 +0100
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Date: 2007-02-05T09:47:38+01:00
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On Sun, 04 Feb 2007 23:47:29 +0100, Markus E Leypold wrote:

> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
> 
>> Consider also this:
>>
>> protected type Bar is
>>    function Make_a_Mess return ...;
>> private
>>    Baz : Integer;
>>       -- To be put into the closure together with barriers of the entries!
>>
>> how do you return a closure from a protected object or a task rendezvous?
>> Will it be able to assign Baz?
> 
> Interesting thought. Either it must inherit the barriers, somehow, or
> you simply can't.

But proposing upward closures you have to be prepared to answer such
questions...
 
>  I
> still do not see, how you would manage to pass procedure upwards which
> us variables that are defined in their environment.

As I said before, I don't want this feature in Ada, it is your wish, not
mine. For all I don't know what is "environment." It is up to you to define
it, before it could be reasonably discussed. Further I don't see why
environment cannot be expressed as an object of manifested type (=OO
solution) and why it should be passed outwards.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de