-- 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;