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-- FC51D00.A
--
--                             Grant of Unlimited Rights
--
--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained 
--     unlimited rights in the software and documentation contained herein.
--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making 
--     this public release, the Government intends to confer upon all 
--     recipients unlimited rights  equal to those held by the Government.  
--     These rights include rights to use, duplicate, release or disclose the 
--     released technical data and computer software in whole or in part, in 
--     any manner and for any purpose whatsoever, and to have or permit others 
--     to do so.
--
--                                    DISCLAIMER
--
--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED 
--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE 
--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
--     PARTICULAR PURPOSE OF SAID MATERIAL.
--*
--
-- FOUNDATION DESCRIPTION:
--      This foundation defines a generic list abstraction. List elements can
--      be of any (nonlimited) type. Lists are implemented as arrays of
--      pointers and are only two elements in length.
--
-- CHANGE HISTORY:
--      06 Dec 94   SAIC    ACVC 2.0
--
--!

generic
   type Element_Type (<>) is private;
package FC51D00 is  -- This package simulates a generic list abstraction.

   -- The definition of List_Type below is purely artificial; its validity
   -- in the context of the abstraction is irrelevant to the feature being
   -- tested.

   type Element_Ptr is access Element_Type;

   subtype List_Size is Natural range 1 .. 2;
   type List_Type is array (List_Size) of Element_Ptr;

   function  View_Element (I : List_Size; L : List_Type) return Element_Type;

   procedure Write_Element (I : in     List_Size;
                            L : in out List_Type;
                            E : in     Element_Type);

   -- ... Other list operations for Element_Type.

end FC51D00;


     --==================================================================--


package body FC51D00 is

   -- The implementations of the operations below are purely artificial; the
   -- validity of their implementations in the context of the abstraction is
   -- irrelevant to the feature being tested.

   function View_Element (I : List_Size; L : List_Type) return Element_Type is
   begin
      return L(I).all;
   end View_Element;


   procedure Write_Element (I : in     List_Size;
                            L : in out List_Type;
                            E : in     Element_Type) is
   begin
      L(I) := new Element_Type'(E);
   end Write_Element;

end FC51D00;