c340a01.a

来自「linux下编程用 编译软件」· A 代码 · 共 166 行

-- C340A01.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 tagged type declared in a package specification
--      may be passed as a generic formal (tagged) private type to a generic
--      package declaration. Check that the formal type may be extended with
--      a record extension in the generic package.
--
--      Check that, in the instance, the record extension inherits the
--      user-defined primitive subprograms of the tagged actual.
--
-- TEST DESCRIPTION:
--      Declare a tagged type and an associated primitive subprogram in a
--      package specification (foundation code). Declare a generic package
--      which takes a tagged type as a formal parameter, and then extends
--      it with a record extension (foundation code).
--      
--      Instantiate the generic package with the tagged type from the first
--      package (the "generic" extension should now have inherited
--      the primitive subprogram of the tagged type from the first
--      package).
-- 
--      In the main program, call the primitive subprogram inherited by the
--      "generic" extension, and verify the correctness of the components.
--
-- TEST FILES:
--      This test consists of the following files:
--
--         F340A000.A
--         F340A001.A
--      => C340A01.A
--
--
-- CHANGE HISTORY:
--      06 Dec 94   SAIC    ACVC 2.0
--      12 Jun 96   SAIC    ACVC 2.1: Modified prologue. Removed extraneous
--                          comments.
--
--!

with F340A001;        -- Book definitions.  
package C340A01_0 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 F340A001.Text_Ptr;

   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"));

end C340A01_0;


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


-- Library-level instantiation. Actual parameter is tagged record.

with F340A001;  -- Book definitions.
with F340A000;  -- Singly-linked list abstraction.
package C340A01_1 is new F340A000 (Parent_Type => F340A001.Book_Type);


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


with Report;

with F340A001;   -- Book definitions.
with C340A01_0;  -- Raw book data.
with C340A01_1;  -- Instance.

use  F340A001;   -- Primitive operations of Book_Type directly visible.
use  C340A01_1;  -- Operations inherited by Node_Type directly visible.

procedure C340A01 is


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


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


   procedure Create_List (Title, Author : in     C340A01_0.Data_List;
                          Head          : in out Node_Ptr) is

      Book     : Node_Type;  -- Object of extended type.
      Book_Ptr : Node_Ptr;

   begin
      for I in C340A01_0.Number_Of_Books loop
         Create_Book (Title (I), Author (I), Book);    -- Call inherited
                                                       -- operation.
         Book_Ptr := new Node_Type'(Book);
         Add (Book_Ptr, Head);
      end loop;
   end Create_List;


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


   function Bad_List_Contents return Boolean is
   begin
      return (List_Of_Books.Title.all            /= "Ulysses"           or
              List_Of_Books.Author.all           /= "Joyce, James"      or
              List_Of_Books.Next.Title.all       /= "Heart of Darkness" or
              List_Of_Books.Next.Author.all      /= "Conrad, Joseph"    or
              List_Of_Books.Next.Next.Title.all  /= "Wuthering Heights" or
              List_Of_Books.Next.Next.Author.all /= "Bronte, Emily");
   end Bad_List_Contents;


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


begin  -- Main program.

   Report.Test ("C340A01", "Inheritance of primitive operations: record " &
                "extension of formal tagged private type; actual is " &
                "an ultimate ancestor type");

   -- Create linked list using inherited operation:
   Create_List (C340A01_0.Title_List, C340A01_0.Author_List, List_Of_Books);

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

   Report.Result;

end C340A01;