c730a02.a

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-- C730A02.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.
--*
--
-- OBJECTIVE:
--      Check that a private extension (declared in a package specification) of
--      a tagged type (declared in a different package specification) may be
--      passed as a generic formal (tagged) private type to a generic package
--      declaration. Check that the formal type may be further extended with a
--      private extension in the generic package.
--
--      Check that the (visible) components inherited by the "generic"
--      extension are visible outside the generic package.
--
--      Check that, in the instance, the private extension inherits the
--      user-defined primitive subprograms of the tagged actual, including
--      those inherited by the actual from its parent.
--
-- TEST DESCRIPTION:
--      Declare a tagged type and an associated primitive subprogram in a
--      package specification (foundation code). Declare a private extension
--      of the tagged type and an associated primitive subprogram in a second
--      package specification. Declare a generic package which takes a tagged
--      type as a formal parameter, and then extends it with a private
--      extension (foundation code).
--      
--      Instantiate the generic package with the private extension from the
--      second package (the "generic" extension should now have inherited
--      the primitive subprograms of the private extension from the second
--      package).
-- 
--      In the main program, call the primitive subprograms inherited by the
--      "generic" extension. There are two: (1) Create_Book, declared for
--      the root tagged type in the first package (inherited by the private
--      extension of the second package, and then in turn by the "generic"
--      extension), and (2) Update_Pages, declared for the private extension
--      in the second package. Verify the correctness of the components.
--
-- TEST FILES:
--      The following files comprise this test:
--
--         F730A000.A
--         F730A001.A
--      => C730A02.A
--
--
-- CHANGE HISTORY:
--      06 Dec 94   SAIC    ACVC 2.0
--
--!

with F730A001;        -- Book definitions.
package C730A02_0 is  -- Extended book abstraction.


   type Detailed_Book_Type is new F730A001.Book_Type          -- Private ext.
     with private;                                            -- of root tagged
                                                              -- type.

   -- Inherits Create_Book from Book_Type.

   procedure Update_Pages (Book  : in out Detailed_Book_Type; -- Primitive op.
                           Pages : in     Natural);           -- of extension.


   -- The following function is needed to verify the value of the
   -- extension's private component. It will be inherited by extensions
   -- of Detailed_Book_Type.

   function Get_Pages (Book : in Detailed_Book_Type) return Natural;
                                                   
private

   type Detailed_Book_Type is new F730A001.Book_Type with record
      Pages : Natural;
   end record;

end C730A02_0;


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


package body C730A02_0 is


   procedure Update_Pages (Book  : in out Detailed_Book_Type;
                           Pages : in     Natural) is
   begin
      Book.Pages := Pages;
   end Update_Pages;


   function Get_Pages (Book : in Detailed_Book_Type) return Natural is
   begin
      return (Book.Pages);
   end Get_Pages;


end C730A02_0;


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


with F730A001;        -- Book definitions. 
package C730A02_1 is  -- Raw data to be used in creating book elements.


   Book_Count : constant := 3;

   subtype Number_Of_Books is Integer range 1 .. Book_Count;

   type Data_List   is array (Number_Of_Books) of F730A001.Text_Ptr;
   type Page_Counts is array (Number_Of_Books) of Natural;

   Title_List  : Data_List   := (new String'("Wuthering Heights"),
                                 new String'("Heart of Darkness"),
                                 new String'("Ulysses"));

   Author_List : Data_List   := (new String'("Bronte, Emily"),
                                 new String'("Conrad, Joseph"),
                                 new String'("Joyce, James"));

   Page_List   : Page_Counts := (237, 215, 456);

end C730A02_1;


-- No body for C730A02_1.


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


-- Library-level instantiation. Actual parameter is private extension.

with C730A02_0;  -- Extended book abstraction.
with F730A000;   -- Singly-linked list abstraction.
package C730A02_2 is new F730A000
  (Parent_Type => C730A02_0.Detailed_Book_Type);


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


with Report;

with C730A02_0; -- Extended book abstraction.
with C730A02_1; -- Raw book data.
with C730A02_2; -- Instance.

use  C730A02_0; -- Primitive operations of Detailed_Book_Type directly visible.
use  C730A02_2; -- Operations inherited by Priv_Node_Type directly visible.

procedure C730A02 is


   List_Of_Books : Priv_Node_Ptr := null;  -- Head of linked list of books.


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


   procedure Create_List (Title, Author : in     C730A02_1.Data_List;
                          Pages         : in     C730A02_1.Page_Counts;
                          Head          : in out Priv_Node_Ptr) is

      Book     : Priv_Node_Type;  -- Object of extended type.
      Book_Ptr : Priv_Node_Ptr;

   begin
      for I in C730A02_1.Number_Of_Books loop
         Create_Book (Title (I), Author (I), Book);    -- Call twice-inherited
                                                       -- operation.
         Update_Pages (Book, Pages (I));               -- Call inherited op.
         Book_Ptr := new Priv_Node_Type'(Book);
         Add (Book_Ptr, Head);
      end loop;
   end Create_List;


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


   function Bad_List_Contents return Boolean is
      Book1_Ptr : Priv_Node_Ptr;
      Book2_Ptr : Priv_Node_Ptr;
      Book3_Ptr : Priv_Node_Ptr;
   begin

      Remove (List_Of_Books, Book1_Ptr);
      Remove (List_Of_Books, Book2_Ptr);
      Remove (List_Of_Books, Book3_Ptr);

      return (Book1_Ptr.Title.all   /= "Ulysses"           or   -- Inherited
              Book1_Ptr.Author.all  /= "Joyce, James"      or   -- components
              Book2_Ptr.Title.all   /= "Heart of Darkness" or   -- should still
              Book2_Ptr.Author.all  /= "Conrad, Joseph"    or   -- be visible
              Book3_Ptr.Title.all   /= "Wuthering Heights" or   -- in private
              Book3_Ptr.Author.all  /= "Bronte, Emily"     or   -- "generic"
                                                                -- extension.
              -- Call inherited operations using dereferenced pointers.
              Get_Pages (Book1_Ptr.all) /= 456             or
              Get_Pages (Book2_Ptr.all) /= 215             or
              Get_Pages (Book3_Ptr.all) /= 237);

   end Bad_List_Contents;


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


begin  -- Main program.

   Report.Test ("C730A02", "Inheritance of primitive operations: private " &
                "extension of formal tagged private type; actual is " &
                "a private extension");

   -- Create linked list using inherited operation:
   Create_List (C730A02_1.Title_List, C730A02_1.Author_List,
                C730A02_1.Page_List,  List_Of_Books);

   -- Verify results:
   if Bad_List_Contents then
      Report.Failed ("Wrong values after call to inherited operations");
   end if;

   Report.Result;

end C730A02;