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-- FC70B00.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 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 -- List abstraction.
type Element_Type is private; -- List elems can be of any nonlimited type.
package FC70B00 is
type List_Type is limited private;
-- Return true if current element is last in the list.
function End_Of_List (L : List_Type) return Boolean;
-- Read current element value; do NOT advance "current" pointer.
procedure View_Element (L : in List_Type; E : out Element_Type);
-- Read from current element and advance "current" pointer.
procedure Read_Element (L : in out List_Type; E : out Element_Type);
-- Write to current element and advance "current" pointer.
procedure Write_Element (L : in out List_Type; E : in Element_Type);
-- Add element to end of list.
procedure Add_Element (L : in out List_Type; E : in Element_Type);
-- Set "current" pointer to first list element.
procedure Reset (L : in out List_Type);
private
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 FC70B00;
--==================================================================--
package body FC70B00 is
function End_Of_List (L : List_Type) return Boolean is
begin
return (L.Current = null);
end End_Of_List;
procedure View_Element (L : in List_Type; E : out Element_Type) is
begin
-- ... Error-checking code omitted for brevity.
E := L.Current.Item; -- Retrieve current element.
end View_Element;
procedure Read_Element (L : in out List_Type; E : out Element_Type) is
begin
-- ... Error-checking code omitted for brevity.
E := L.Current.Item; -- Retrieve current element.
L.Current := L.Current.Next; -- Advance "current" pointer.
end Read_Element;
procedure Write_Element (L : in out List_Type; E : in Element_Type) is
begin
-- ... Error-checking code omitted for brevity.
L.Current.Item := E; -- Write to current element.
L.Current := L.Current.Next; -- Advance "current" pointer.
end Write_Element;
procedure Add_Element (L : in out List_Type; E : in Element_Type) is
New_Node : Node_Pointer := new Node_Type'(E, null);
begin
if L.First = null then -- No elements in list, so add new
L.First := New_Node; -- element at beginning of list.
else
L.Last.Next := New_Node; -- Add new element at end of list.
end if;
L.Last := New_Node; -- Set last-in-list pointer.
end Add_Element;
procedure Reset (L : in out List_Type) is
begin
L.Current := L.First; -- Set "current" pointer to first
end Reset; -- list element.
end FC70B00;
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