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From: Lutz Donnerhacke <lutz@iks-jena.de>
Newsgroups: comp.lang.ada
Subject: Elegant 'realloc'?
Date: Thu, 31 Jul 2003 09:57:51 +0000 (UTC)
Organization: IKS GmbH Jena
Message-ID: <slrnbihq0e.2j7.lutz@taranis.iks-jena.de>
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Xref: archiver1.google.com comp.lang.ada:41066
Date: 2003-07-31T09:57:51+00:00
List-Id: <comp.lang.ada>

When dealing with dynamically allocated variable length arrays, the
allocated space might change. Is there a common idiom to simulate an
'realloc' (especially shrinking) other than, allocate, copy, free?

   declare
      procedure Free is new Unchecked_Deallocation(T_Array, T_Array_Access);
      oldp : constant T_Array_Access := current.field;
   begin
      current.field := new T_Array'(oldp(oldp'First .. current.last));
      Free(oldp);
   end;