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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;
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