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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Language lawyer question: task activation
Date: Fri, 27 Feb 2009 17:29:10 -0600
Organization: Jacob Sparre Andersen
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Date: 2009-02-27T17:29:10-06:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message 
news:1vcaimc8kjj30$.kf3rsd670ebp$.dlg@40tude.net...
...
>> When a procedure P(Object: out T) returns, there
>> is a yield (in Object).
>
> No, it is not so. The actual of Object out T is constructed *prior* to 
> call
> to P. In contrast the "actual" of F return T is not constructed (when T is
> limited). This is exactly the thing that worries me. Because it makes out 
> T
> and return T different, while they are evidently same.

To you, maybe, but not in Ada. Even in Ada 83, "out T" and "return T" are 
different:

   procedure Foo (P : out String);
   function Bar return String;

Bar creates a *new* object with unknown bounds; Foo takes an *existing* 
object with whatever bounds it has. Totally different animals. 
Build-in-place is a rather natural extension to this model. (It's annoying 
that we don't have a way to do return-by-reference as well, but that's 
another topic).

Now, I realize you have rather firm ideas about what represents a "proper 
type model", but that's pretty much irrelevant to the Ada type model (which 
isn't going to change for obvious compatibility reasons).

                        Randy.