Re: Unbounded string deallocation

[Andy Askey <askeya@res.raytheon.com>]

Martin,
Thanx for the info.  My unbound string never goes out of scope until I
terminate my program (which is why I "thought" needed to deallocate it
myself).  If all I have to do to reclaim the memory is to create a new
string using the same variable, then this takes care of all my
problems.  Just to make sure I understand this correctly:

my_string : ada.strings.unbounded_string;
begin

  -- grab approx 1024 bytes of memory
  my_string := new ada.strings.unbounded_string.To_Unbound_String(1024);

  -- give back the 1024 bytes and grab 2048 new memory bytes
  my_string := new ada.strings.unbounded_string.To_Unbound_String(2048);

end

Is this correct.  I know am being simplistic with the actually memory
bytes allocated. But do I have the theory correct?

Thanx.
Andy


"Martin C. Carlisle" wrote:
> 
> Actually, the great thing about Ada.Strings.Unbounded is that the
> LRM requires it not to leak memory.  See LRM A.4.5(88).
> This means that when an unbounded string is reassigned, or goes out of
> scope, the memory will be reclaimed.
> 
> To use it for a brief period of time, use a declare block.
> 
> --Martin
> 
> In article <37C46FD4.A42CC1A1@res.raytheon.com>,
> Andy Askey  <askeya@res.raytheon.com> wrote:
> >I am looking into using Ada.Strings.Unbounded for dynamically creating
> >temporary storage of character arrays.  When I am finished processing
> >the string, I want to deallocate it.  I found a "Free" routine in the
> >spec but this uses a pointer to STRING and not UNBOUNDED_STRING.
> >
> >From the Apex ada.strings.unbounded.1.ada =>
> >
> > type Unbounded_String is private;
> > type String_Access is access all String;
> > procedure Free (X : in out String_Access);
> >
> >Can anyone help me out with the deallocation?  Anyone have a better idea
> >for dynamically allocating and deallocating memory for a small to medium
> >size byte array?
> >
> >Thanx.
> >--
> >---------------------------------------------------
> >|                 Andy Askey                      |
> >|              Software Engineer                  |
> >|           Raytheon Systems Company              |
> >|   670 Discovery Drive, Huntsville, AL  35806    |
> >|   Phone: (256) 971-2367  Fax: (256) 971-2306    |
> >|        andrew_j_askey@res.raytheon.com          |
> >---------------------------------------------------
> 
> --
> Martin C. Carlisle, Asst Prof of Computer Science, US Air Force Academy
> carlislem@acm.org, http://www.usafa.af.mil/dfcs/bios/carlisle.html
> DISCLAIMER:  This content in no way reflects the opinions, standards or
> policy of the US Air Force Academy or the United States Government.

-- 
---------------------------------------------------
|                 Andy Askey                      |
|              Software Engineer                  |
|           Raytheon Systems Company              |
|   670 Discovery Drive, Huntsville, AL  35806    |
|   Phone: (256) 971-2367  Fax: (256) 971-2306    |
|        andrew_j_askey@res.raytheon.com          |
---------------------------------------------------