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|
-- C3A0009.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 subprogram references may be passed as parameters using
-- access-to-subprogram types. Check that the passed subprograms may
-- be invoked from within the called subprogram.
--
-- TEST DESCRIPTION:
-- Declare an access to procedure type in a package specification.
-- Declare a root tagged type with the access to procedure type as a
-- component. Declare three primitive procedures for the type that
-- can be referred to by the access to procedure type. Use the access
-- to procedure type to initialize the component of a record.
--
-- Extend the root type with a private extension in the same package
-- specification. Declare two new primitive subprograms for the extension
-- (in addition to its three inherited subprograms).
--
-- In the main program, declare an operation for the root tagged type
-- which can be passed as an access value to change the initial value
-- of the component. Call the inherited operations indirectly by
-- de-referencing the access value to set value in the extension.
-- Call the primitive function to modify the extension by passing
-- the access value designating the primitive procedure as a parameter.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
package C3A0009_0 is -- Push_Buttons
type Button is tagged private;
-- Type accesses to procedures Push and Default_Response
type Button_Response_Ptr is access procedure
(B : in out Button);
procedure Push (B : in out Button); -- to be inherited
procedure Set_Response (B : in out Button; -- to be inherited
R : in Button_Response_Ptr);
procedure Default_Response (B : in out Button); -- to be inherited
type Alert_Button is new Button with private; -- private extension of
-- root tagged type
-- Inherits procedure Push from Button
-- Inherits procedure Set_Response from Button
-- Inherits procedure Default_Response from Button
procedure Replace_Action( B: in out Alert_Button );
-- type accesses to procedure Default_Action
type Button_Action_Ptr is access procedure;
-- The following function is needed to set value in the
-- extension's private component.
function Alert (B : in Alert_Button) return Button_Action_Ptr;
private
type Button is tagged -- root tagged type
record
Response : Button_Response_Ptr
:= Default_Response'Access;
end record;
procedure Default_Action;
type Alert_Button is new Button with record
Action : Button_Action_Ptr
:= Default_Action'Access;
end record;
end C3A0009_0;
-----------------------------------------------------------------------------
with TCTouch;
package body C3A0009_0 is
procedure Push (B : in out Button) is
begin
TCTouch.Touch( 'P' ); --------------------------------------------- P
-- Invoking subprogram designated by access value
B.Response (B);
end Push;
procedure Set_Response (B : in out Button;
R : in Button_Response_Ptr) is
begin
TCTouch.Touch( 'S' ); --------------------------------------------- S
-- Set procedure value in record
B.Response := R;
end Set_Response;
procedure Default_Response (B : in out Button) is
begin
TCTouch.Touch( 'D' ); --------------------------------------------- D
end Default_Response;
procedure Default_Action is
begin
TCTouch.Touch( 'd' ); --------------------------------------------- d
end Default_Action;
procedure Replacement_Action is
begin
TCTouch.Touch( 'r' ); --------------------------------------------- r
end Replacement_Action;
procedure Replace_Action( B: in out Alert_Button ) is
begin
TCTouch.Touch( 'R' ); --------------------------------------------- R
B.Action := Replacement_Action'Access;
end Replace_Action;
function Alert (B : in Alert_Button) return Button_Action_Ptr is
begin
TCTouch.Touch( 'A' ); --------------------------------------------- A
return (B.Action);
end Alert;
end C3A0009_0;
-----------------------------------------------------------------------------
with C3A0009_0;
package C3A0009_1 is -- Emergency_Items
package Push_Buttons renames C3A0009_0;
procedure Emergency (B : in out Push_Buttons.Button);
end C3A0009_1;
with TCTouch;
package body C3A0009_1 is -- Emergency_Items
procedure Emergency (B : in out Push_Buttons.Button) is
begin
TCTouch.Touch( 'E' ); ------------------------------------------- E
end Emergency;
end C3A0009_1;
-----------------------------------------------------------------------------
with Report;
with C3A0009_0, C3A0009_1;
with TCTouch;
procedure C3A0009 is
package Push_Buttons renames C3A0009_0;
package Emergency_Items renames C3A0009_1;
Black_Button : Push_Buttons.Alert_Button;
Alert_Ptr : Push_Buttons.Button_Action_Ptr;
begin
Report.Test ("C3A0009", "Check that subprogram references may be passed "
& "as parameters using access-to-subprogram types. "
& "Check that the passed subprograms may be "
& "invoked from within the called subprogram");
Push_Buttons.Push( Black_Button );
Push_Buttons.Alert( Black_Button ).all;
TCTouch.Validate( "PDAd", "Default operation set" );
-- Call inherited operations Set_Response and Push to set
-- Emergency value in the extension.
Push_Buttons.Set_Response (Black_Button, Emergency_Items.Emergency'Access);
Push_Buttons.Push( Black_Button );
Push_Buttons.Alert( Black_Button ).all;
TCTouch.Validate( "SPEAd", "Altered Response set" );
-- Call primitive operation to set action value in the extension.
Push_Buttons.Replace_Action( Black_Button );
Push_Buttons.Push( Black_Button );
Push_Buttons.Alert( Black_Button ).all;
TCTouch.Validate( "RPEAr", "Altered Action set" );
Report.Result;
end C3A0009;
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