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From: Erik Sigra <sigra@home.se>
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Subject: Re: How do I free unbounded strings?
Date: Mon, 5 Mar 2001 22:10:21 +0100
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Date: 2001-03-05T22:10:21+01:00

m�ndagen den  5 mars 2001 21:14 skrev Florian Weimer:
> Well, you can't expect that a program will use operating system
> interfaces to allocate individual, small strings.  Usually, memory is
> obtained from the operating systems in large chunks which are filled
> with smaller objects, and only large objects are directly allocated
> via the operating system.
>
> GNAT uses the C malloc()/free() memory management interface, which
> might or might not return deallocated memory to the operating system
> (of course, a large chunk can only be given back if all the objects in
> it have been deallocated).  GNU/Linux systems feature a
> malloc()/free() implementation which does return completely unused
> chunks.

Thanks. Then I will assume that things are allright. Now to a related 
question. Consider this situation:

  type Post_Node;
  type Post_List is access Post_Node;
  type Post_Node is record
     Name : Unbounded_string;
     Next : Post_List;
  end record;

I allocate a Post_Node and store an unbounded string in it. Then I deallocate 
it with an instance of Ada.Unchecked_Deallocation. Is the memory that the 
unbounded string used lost?

If so, does it help to assign Null_Unbounded_String to it before freeing the 
record?

Or is there something else I have to do, some pitfalls?

If the answer can be found in some document, can you provide a link?