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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;