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+-- F340A000.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 file simulates a generic linked list abstraction for use in tests
+-- covering tagged types and type extensions.
+--
+-- TEST FILES:
+-- This foundation consists of the following files:
+--
+-- => F340A000.A
+-- F340A001.A
+--
+-- CHANGE HISTORY:
+-- 06 Dec 94 SAIC ACVC 2.0
+-- 12 Jun 96 SAIC ACVC 2.1: Modified prologue. Added pragma
+-- Elaborate_Body.
+--
+--!
+
+generic -- Singly-linked list abstraction.
+ type Parent_Type is tagged private; -- Actual is parent
+package F340A000 is -- tagged type.
+
+ pragma Elaborate_Body;
+
+
+ -- Declarations for visible linked list nodes:
+
+ type Node_Type;
+
+ type Node_Ptr is access Node_Type;
+
+ type Node_Type is new Parent_Type with record -- Record extension
+ Next : Node_Ptr := null; -- of parent type.
+ end record;
+
+
+ -- Inherits primitive operations of actual type corresponding
+ -- to Parent_Type.
+
+ -- Add node at head of list.
+ procedure Add (Item : in Node_Ptr;
+ Head : in out Node_Ptr);
+
+ -- Remove node from head of list and return it.
+ procedure Remove (Head : in out Node_Ptr;
+ Item : out Node_Ptr);
+
+
+
+ -- Declarations for private linked list nodes:
+
+ type Priv_Node_Type is new Parent_Type with private; -- Private extension
+ -- of parent type.
+
+ -- Inherits primitive operations of actual parameter corresponding
+ -- to Parent_Type.
+
+
+ type Priv_Node_Ptr is access Priv_Node_Type;
+
+
+ -- Add node at head of list.
+ procedure Add (Item : in Priv_Node_Ptr;
+ Head : in out Priv_Node_Ptr);
+
+ -- Remove node from head of list and return it.
+ procedure Remove (Head : in out Priv_Node_Ptr;
+ Item : out Priv_Node_Ptr);
+
+
+private
+
+ type Priv_Node_Type is new Parent_Type with record
+ Next : Priv_Node_Ptr := null;
+ end record;
+
+end F340A000;
+
+
+ --==================================================================--
+
+
+package body F340A000 is -- Singly-linked list abstraction.
+
+ procedure Add (Item : in Node_Ptr;
+ Head : in out Node_Ptr) is
+ begin
+ if Item /= null then
+ Item.Next := Head;
+ Head := Item;
+ end if;
+ end Add;
+
+
+ procedure Remove (Head : in out Node_Ptr;
+ Item : out Node_Ptr) is
+ begin
+ Item := Head;
+ if Head /= null then
+ Head := Head.Next;
+ end if;
+ end Remove;
+
+
+ procedure Add (Item : in Priv_Node_Ptr;
+ Head : in out Priv_Node_Ptr) is
+ begin
+ if Item /= null then
+ Item.Next := Head;
+ Head := Item;
+ end if;
+ end Add;
+
+
+ procedure Remove (Head : in out Priv_Node_Ptr;
+ Item : out Priv_Node_Ptr) is
+ begin
+ Item := Head;
+ if Head /= null then
+ Head := Head.Next;
+ end if;
+ end Remove;
+
+
+end F340A000;