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1 294 jeremybenn
-- FC70C00.A
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--
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--                             Grant of Unlimited Rights
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--
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--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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--     unlimited rights in the software and documentation contained herein.
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--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making
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--     this public release, the Government intends to confer upon all
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--     recipients unlimited rights  equal to those held by the Government.
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--     These rights include rights to use, duplicate, release or disclose the
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--     released technical data and computer software in whole or in part, in
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--     any manner and for any purpose whatsoever, and to have or permit others
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--     to do so.
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--
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--                                    DISCLAIMER
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--
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--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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--     PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- FOUNDATION DESCRIPTION:
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--      This foundation defines a generic list abstraction in two packages.
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--      The first package declares the types, the second declares the
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--      operations. List elements can be of any (nonlimited) type. Lists are
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--      implemented as singly linked lists. Access to list elements is
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--      sequential. For each list, pointers are maintained to the first and
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--      last elements in the list, as well as the next element to be accessed.
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--
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-- CHANGE HISTORY:
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--      06 Dec 94   SAIC    ACVC 2.0
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--
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--!
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generic
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   type Element_Type is private;  -- List elems may be of any nonlimited type.
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package FC70C00_0 is              -- List abstraction.
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   type Node_Type;
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   type Node_Pointer is access Node_Type;
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   type Node_Type is record
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      Item : Element_Type;
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      Next : Node_Pointer;
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   end record;
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   type List_Type is record
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      First   : Node_Pointer;
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      Current : Node_Pointer;
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      Last    : Node_Pointer;
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   end record;
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end FC70C00_0;
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     --==================================================================--
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-- No body for FC70C00_0;
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     --==================================================================--
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with FC70C00_0;                -- List abstraction.
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generic
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   with package List_Mgr is new FC70C00_0 (<>);
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package FC70C00_1 is           -- Basic list operations.
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   -- Return true if current element is last in the list.
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   function End_Of_List (L : List_Mgr.List_Type) return Boolean;
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   -- Set "current" pointer to first list element.
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   procedure Reset (L : in out List_Mgr.List_Type);
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end FC70C00_1;
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     --==================================================================--
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package body FC70C00_1 is
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   function End_Of_List (L : List_Mgr.List_Type) return Boolean is
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      use List_Mgr;  -- Renders "=" directly visible.
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   begin
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      return (L.Current = null);
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   end End_Of_List;
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   procedure Reset (L : in out List_Mgr.List_Type) is
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   begin
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      L.Current := L.First;                 -- Set "current" pointer to first
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   end Reset;                               -- list element.
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end FC70C00_1;

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