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-- FC70C00.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 in two packages.

--      The first package declares the types, the second declares the

--      operations. List elements can be of any (nonlimited) type. Lists are

--      implemented as singly linked lists. Access to list elements is

--      sequential. For each list, pointers are maintained to the first and

--      last elements in the list, as well as the next element to be accessed.

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--

--!

generic

   type Element_Type is private;  -- List elems may be of any nonlimited type.

package FC70C00_0 is              -- List abstraction.

   type Node_Type;

   type Node_Pointer is access Node_Type;

   type Node_Type is record

      Item : Element_Type;

      Next : Node_Pointer;

   end record;

   type List_Type is record

      First   : Node_Pointer;

      Current : Node_Pointer;

      Last    : Node_Pointer;

   end record;

end FC70C00_0;

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

-- No body for FC70C00_0;

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

with FC70C00_0;                -- List abstraction.

generic

   with package List_Mgr is new FC70C00_0 (<>);

package FC70C00_1 is           -- Basic list operations.

   -- Return true if current element is last in the list.

   function End_Of_List (L : List_Mgr.List_Type) return Boolean;

   -- Set "current" pointer to first list element.

   procedure Reset (L : in out List_Mgr.List_Type);

end FC70C00_1;

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

package body FC70C00_1 is

   function End_Of_List (L : List_Mgr.List_Type) return Boolean is

      use List_Mgr;  -- Renders "=" directly visible.

   begin

      return (L.Current = null);

   end End_Of_List;

   procedure Reset (L : in out List_Mgr.List_Type) is

   begin

      L.Current := L.First;                 -- Set "current" pointer to first

   end Reset;                               -- list element.

end FC70C00_1;