------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                 S Y S T E M . C H E C K E D _ P O O L S                  --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--                            $Revision: 1.2 $                              --
--                                                                          --
--   Copyright (C) 1992,1993,1994,1995,1996 Free Software Foundation, Inc.  --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- As a special exception,  if other files  instantiate  generics from this --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
--                                                                          --
------------------------------------------------------------------------------

with System.Storage_Elements;
with System.Storage_Pools;
package System.Checked_Pools is

   type Checked_Pool is abstract
     new System.Storage_Pools.Root_Storage_Pool with private;
   --  Equivalent of storage pools with the addition that Dereference is
   --  called on each implicit or explicit dereference of a pointer which
   --  has such a storage pool

   procedure Allocate
     (Pool                     : in out Checked_Pool;
      Storage_Address          : out Address;
      Size_In_Storage_Elements : in System.Storage_Elements.Storage_Count;
      Alignment                : in System.Storage_Elements.Storage_Count)
   is abstract;

   procedure Deallocate
     (Pool                     : in out Checked_Pool;
      Storage_Address          : in Address;
      Size_In_Storage_Elements : in System.Storage_Elements.Storage_Count;
      Alignment                : in System.Storage_Elements.Storage_Count)
   is abstract;

   function Storage_Size
     (Pool : Checked_Pool)
      return System.Storage_Elements.Storage_Count
   is abstract;

   procedure Dereference
     (Pool                     : in out Checked_Pool;
      Storage_Address          : in Address;
      Size_In_Storage_Elements : in System.Storage_Elements.Storage_Count;
      Alignment                : in System.Storage_Elements.Storage_Count)
   is abstract;
   --  Called each time a pointer to a checked pool is dereferenced

private
   type Checked_Pool is abstract
     new System.Storage_Pools.Root_Storage_Pool with null record;
end System.Checked_Pools;