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-- C3A0007.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 call to a subprogram via an access-to-subprogram value
-- stored in a data structure will correctly dispatch according to the
-- tag of the class-wide parameter passed via that call.
--
-- 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 record extension in another package
-- specification. Declare a new primitive procedure 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 operation indirectly by
-- dereferencing the access value to check on the initial value of the
-- extension. Call inherited operations indirectly by dereferencing
-- the access value to replace the initial value. Call the primitive
-- procedure indirectly by dereferencing the access value to modify the
-- extension.
--
-- type Button
-- procedure Push(Button)
-- procedure Set_Response(Button,Button_Response_Ptr)
-- procedure Default_Response(Button)
--
-- type Priority_Button (new Button)
-- procedures Push, Set_Response inherited
-- procedure Default_Response
-- procedure Set_Priority
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
package C3A0007_0 is
Default_Call : Boolean := False;
type Button is tagged private;
type Button_Response_Ptr is access procedure
(B : in out Button'Class);
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 Response (B : in out Button); -- to be inherited
private
procedure Default_Response(B: in out Button'Class);
type Button is tagged -- root tagged type
record
Action : Button_Response_Ptr
:= Default_Response'Access;
end record;
end C3A0007_0;
with C3A0007_0;
package C3A0007_1 is
type Priority_Button is new C3A0007_0.Button
with record
Priority : Integer := 0;
end record;
-- Inherits procedure Push from Button
-- Inherits procedure Set_Response from Button
-- Override procedure Response from Button
procedure Response (B : in out Priority_Button);
-- Primitive operation of the extension
procedure Set_Priority (B : in out Priority_Button);
end C3A0007_1;
with C3A0007_0;
package C3A0007_2 is
Emergency_Call : Boolean := False;
procedure Emergency (B : in out C3A0007_0.Button'Class);
end C3A0007_2;
-----------------------------------------------------------------------------
with TCTouch;
package body C3A0007_0 is
procedure Push (B : in out Button) is
begin
TCTouch.Touch( 'P' ); --------------------------------------------- P
-- Invoking subprogram designated by access value
B.Action (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.Action := R;
end Set_Response;
procedure Response (B : in out Button) is
begin
TCTouch.Touch( 'D' ); --------------------------------------------- D
Default_Call := True;
end Response;
procedure Default_Response (B : in out Button'Class) is
begin
TCTouch.Touch( 'C' ); --------------------------------------------- C
Response(B);
end Default_Response;
end C3A0007_0;
with TCTouch;
package body C3A0007_1 is
procedure Set_Priority (B : in out Priority_Button) is
begin
TCTouch.Touch( 's' ); --------------------------------------------- s
B.Priority := 1;
end Set_Priority;
procedure Response (B : in out Priority_Button) is
begin
TCTouch.Touch( 'd' ); --------------------------------------------- d
end Response;
end C3A0007_1;
with TCTouch;
package body C3A0007_2 is
procedure Emergency (B : in out C3A0007_0.Button'Class) is
begin
TCTouch.Touch( 'E' ); ------------------------------------------- E
Emergency_Call := True;
end Emergency;
end C3A0007_2;
-----------------------------------------------------------------------------
with Report;
with TCTouch;
with C3A0007_0;
with C3A0007_1;
with C3A0007_2;
procedure C3A0007 is
Pink_Button : C3A0007_0.Button;
Green_Button : C3A0007_1.Priority_Button;
begin
Report.Test ("C3A0007", "Check that a call to a subprogram via an "
& "access-to-subprogram value stored in a data "
& "structure will correctly dispatch according to "
& "the tag of the class-wide parameter passed "
& "via that call" );
-- Call inherited operation Push to set Default_Response value
-- in the extension.
C3A0007_1.Push (Green_Button);
TCTouch.Validate("PCd", "First Green Button Push");
TCTouch.Assert_Not(C3A0007_0.Default_Call,
"Incorrect Green Default_Response");
C3A0007_0.Push (Pink_Button);
TCTouch.Validate("PCD", "First Pink Button Push");
-- Call inherited operations Set_Response and Push to set
-- Emergency value in the extension.
C3A0007_1.Set_Response (Green_Button, C3A0007_2.Emergency'Access);
C3A0007_1.Push (Green_Button);
TCTouch.Validate("SPE", "Second Green Button Push");
TCTouch.Assert(C3A0007_2.Emergency_Call, "Incorrect Green Emergency");
C3A0007_0.Set_Response (Pink_Button, C3A0007_2.Emergency'Access);
C3A0007_0.Push (Pink_Button);
TCTouch.Validate("SPE", "Second Pink Button Push");
-- Call primitive operation to set priority value
-- in the extension.
C3A0007_1.Set_Priority (Green_Button);
TCTouch.Validate("s", "Green Button Priority");
TCTouch.Assert(Green_Button.Priority = 1, "Incorrect Set_Priority");
Report.Result;
end C3A0007;
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