| -- CC30001.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 if a non-overriding primitive subprogram is declared for |
| -- a type derived from a formal derived tagged type, the copy of that |
| -- subprogram in an instance can override a subprogram inherited from the |
| -- actual type. |
| -- |
| -- TEST DESCRIPTION: |
| -- User writes program to handle both mail messages and system messages. |
| -- |
| -- Mail messages are created by instantiating a generic "mail" package |
| -- with a root message type. System messages are created by |
| -- instantiating the generic with a system message type derived from the |
| -- root in a separate package. The system message type has a primitive |
| -- subprogram called Send. |
| -- |
| -- Inside the generic, a "mail" type is derived from the generic formal |
| -- derived type, and a "Send" operation is declared. |
| -- |
| -- Declare a root tagged type T. Declare a generic package with a formal |
| -- derived type using the root tagged type as ancestor. In the generic, |
| -- derive a type from the formal derived type and declare a primitive |
| -- subprogram for it. In a separate package, declare a derivative DT of |
| -- the root tagged type T and declare a primitive subprogram which is |
| -- type conformant with (and hence, overridable for) the primitive |
| -- declared in the generic. Instantiate the generic for DT. Make both |
| -- dispatching and non-dispatching calls to the primitive subprogram. In |
| -- both cases the version of the subprogram in the instance should be |
| -- called (since it overrides the implementation inherited from the |
| -- actual). |
| -- |
| -- |
| -- CHANGE HISTORY: |
| -- 06 Dec 94 SAIC ACVC 2.0 |
| -- 13 Apr 95 SAIC Replaced call involving instance for root tagged |
| -- type with a dispatching call involving instance |
| -- for derived type. Updated commentary. Moved |
| -- instantiations (and related commentary) to |
| -- library-level to avoid accessibility violation. |
| -- Commented out instantiation for root tagged type. |
| -- 27 Feb 97 PWB.CTA Added elaboration pragma. |
| --! |
| |
| package CC30001_0 is -- Root message type. |
| |
| type Msg_Type is tagged record |
| Text : String (1 .. 20); |
| Message_Sent : Boolean; |
| end record; |
| |
| end CC30001_0; |
| |
| |
| --==================================================================-- |
| |
| |
| with CC30001_0; -- Root message type. |
| generic -- Generic "mail" package. |
| type Message is new CC30001_0.Msg_Type with private; |
| package CC30001_1 is |
| |
| type Mail_Type is new Message with record -- Derived from formal type. |
| To : String (1 .. 8); |
| end record; |
| |
| procedure Send (M : in out Mail_Type); -- For this test, this version |
| -- of Send should be called in |
| -- ... Other operations. -- all cases. |
| |
| end CC30001_1; |
| |
| |
| --==================================================================-- |
| |
| |
| package body CC30001_1 is |
| |
| procedure Send (M : in out Mail_Type) is |
| begin |
| -- ... Code to send message omitted for brevity. |
| M.Message_Sent := True; |
| end Send; |
| |
| end CC30001_1; |
| |
| |
| --==================================================================-- |
| |
| |
| with CC30001_0; -- Root message type. |
| package CC30001_2 is -- System message type and operations. |
| |
| type Signal_Type is (Note, Warning, Error); |
| |
| type Sys_Message is new CC30001_0.Msg_Type with record -- Derived from |
| Signal : Signal_Type := Warning; -- root type. |
| end record; |
| |
| procedure Send (Item : in out Sys_Message); -- For this test, this version |
| -- of Send should never be |
| -- ... Other operations. -- called (it will have been |
| -- overridden). |
| end CC30001_2; |
| |
| |
| --==================================================================-- |
| |
| |
| package body CC30001_2 is |
| |
| procedure Send (Item : in out Sys_Message) is |
| begin |
| -- ... Code to send message omitted for brevity. |
| Item.Message_Sent := False; -- Ensure this procedure gives a different |
| end Send; -- result than CC30001_1.Send. |
| |
| end CC30001_2; |
| |
| |
| --==================================================================-- |
| |
| |
| -- User first sets up support for mail messages by instantiating the |
| -- generic mail package for the root message type. An operation "Send" is |
| -- declared for the mail message type in the instance. |
| -- |
| -- with CC30001_0; -- Root message type. |
| -- with CC30001_1; -- Generic "mail" package. |
| -- package Mail_Messages is new CC30001_1 (CC30001_0.Msg_Type); |
| |
| |
| --==================================================================-- |
| |
| |
| -- Next, the user sets up support for system messages by instantiating the |
| -- generic mail package with the system message type. An operation "Send" |
| -- is declared for the "system" mail message type in the instance. This |
| -- operation overrides the "Send" operation inherited from the system |
| -- message type actual (a situation the user may not have intended). |
| |
| with CC30001_1; -- Generic "mail" package. |
| with CC30001_2; -- System message type and operations. |
| pragma Elaborate (CC30001_1); |
| package CC30001_3 is new CC30001_1 (CC30001_2.Sys_Message); |
| |
| |
| --==================================================================-- |
| |
| with CC30001_2; -- System message type and operations. |
| with CC30001_3; -- Instance with mail type and operations. |
| |
| with Report; |
| procedure CC30001 is |
| |
| package System_Messages renames CC30001_3; |
| |
| |
| Sys_Msg1 : System_Messages.Mail_Type := (Text => "System shutting down", |
| Signal => CC30001_2.Warning, |
| To => "AllUsers", |
| Message_Sent => False); |
| |
| Sys_Msg2 : System_Messages.Mail_Type'Class := Sys_Msg1; |
| |
| |
| use System_Messages, CC30001_2; -- All versions of "Send" |
| -- directly visible. |
| |
| begin |
| |
| Report.Test ("CC30001", "Check that if a non-overriding primitive " & |
| "subprogram is declared for a type derived from a formal " & |
| "derived tagged type, the copy of that subprogram in an " & |
| "instance can override a subprogram inherited from the " & |
| "actual type"); |
| |
| |
| Send (Sys_Msg1); -- Calls version declared in instance (version declared |
| -- in CC30001_2 has been overridden). |
| |
| if not Sys_Msg1.Message_Sent then |
| Report.Failed ("Non-dispatching call: instance operation not called"); |
| end if; |
| |
| |
| Send (Sys_Msg2); -- Calls version declared in instance (version declared |
| -- in CC30001_2 has been overridden). |
| |
| if not Sys_Msg2.Message_Sent then |
| Report.Failed ("Dispatching call: instance operation not called"); |
| end if; |
| |
| |
| Report.Result; |
| end CC30001; |
