-- 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;