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From: "Grein, Christoph" <christoph.grein@eurocopter.com>
Newsgroups: comp.lang.ada
Subject: Re: new_line in a put_line
Date: Thu, 5 Dec 2002 07:28:41 +0100 (MET)
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Date: 2002-12-05T07:28:41+01:00

> > >>    procedure Put_Line (Text : String) is
> > >>       Get_It : Lock (Write_Mutex'Access);
> > >>    begin
> > >>       Ada.Text_IO.Put_Line (Text);
> > >>    end Put_Line;
> > >
> > >Something inside me rebels at using side-effects from a declaration
> > >like that. 
> > 
> > Right, right. It is also my opinion [there was a thread regarding this
> > subject in c.l.a] that using unused (:-)) objects probably indicates a
> > design problem. 
> 
> That's what pragma Unreferenced (in GNAT) is for; it documents that
> the object is declared only for the hidden effects of Initialize and
> Finalize.
> 
> Assuming Lock is a controlled type, that releases the lock in
> Finalize, this is an excellent design.

This should only be necessary for objects of not limited controlled types. As I said, 
limited controlled objects must not be optimized away.