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-- C393008.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.
--*
--
-- TEST OBJECTIVE:
-- Check that an extended type can be derived from an abstract type.
--
-- TEST DESCRIPTION:
-- Declare a tagged record; declare an abstract
-- primitive operation and a non-abstract primitive operation of the
-- type. Derive an extended type from it, including a new component.
-- Use the derived type, the overriding operation and the inherited
-- operation to instantiate a generic package. The overriding operation
-- calls a new primitive operation and an inherited operation [so the
-- instantiation must get this sorted out correctly].
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
with Report;
with TCTouch;
procedure C393008 is
package C393008_0 is
type Status_Enum is (No_Status, Handled, Unhandled, Pending);
type Alert_Type is abstract tagged record
Status : Status_Enum;
Reply : Boolean;
Urgent : Boolean;
end record;
subtype Serial_Number is Integer range 0..Integer'last;
Serial_Num : Serial_Number := 0;
procedure Handle (A : in out Alert_Type) is abstract;
-- abstract primitive operation
-- the procedure Init would be _nice_ have this procedure be non_abstract
-- and create a "base" object with a "null" constraint. The language
-- will not allow this due to the restriction that an object of an
-- abstract type cannot be created. Hence Init must be abstract,
-- requiring any type derived directly from Alert_Type to declare
-- an Init.
--
-- In light of this, I have changed init to a function to more closely
-- model the typical usage of OO features...
function Init return Alert_Type is abstract;
procedure No_Reply (A : in out Alert_Type);
end C393008_0;
--=======================================================================--
package body C393008_0 is
procedure No_Reply (A : in out Alert_Type) is
begin -- primitive operation, not abstract
TCTouch.Touch('A'); ------------------------------------------------- A
if A.Status = Handled then
A.Reply := False;
end if;
end No_Reply;
end C393008_0;
--=======================================================================--
generic
-- pass in the Alert_Type object, including its
-- operations
type Data_Type is new C393008_0.Alert_Type with private;
-- note that Alert_Type is abstract, so it may not be
-- used as an actual parameter
with procedure Update (P : in out Data_Type) is <>; -- generic formal
with function Initialize return Data_Type is <>; -- generic formal
package C393008_1 is
-- Utilities
procedure Modify (Item : in out Data_Type);
end C393008_1;
-- Utilities
--=======================================================================--
package body C393008_1 is
-- Utilities
procedure Modify (Item : in out Data_Type) is
begin
TCTouch.Touch('B'); --------------------------------------------- B
Item := Initialize;
Update (Item);
end Modify;
end C393008_1;
--=======================================================================--
package C393008_2 is
type Low_Alert_Type is new C393008_0.Alert_Type with record
Serial : C393008_0.Serial_Number;
end record;
procedure Serialize (LA : in out Low_Alert_Type);
-- inherit No_Reply
procedure Handle (LA : in out Low_Alert_Type);
function Init return Low_Alert_Type;
end C393008_2;
package body C393008_2 is
procedure Serialize (LA : in out Low_Alert_Type) is
begin -- new primitive operation
TCTouch.Touch('C'); ------------------------------------------------- C
C393008_0.Serial_Num := C393008_0.Serial_Num + 1;
LA.Serial := C393008_0.Serial_Num;
end Serialize;
-- inherit No_Reply
function Init return Low_Alert_Type is
TA: Low_Alert_Type;
begin
TCTouch.Touch('D'); ------------------------------------------------- D
Serialize( TA );
TA.Status := C393008_0.No_Status;
return TA;
end Init;
procedure Handle (LA : in out Low_Alert_Type) is
begin -- overrides abstract inherited Handle
TCTouch.Touch('E'); ------------------------------------------------- E
Serialize (LA);
LA.Reply := False;
LA.Status := C393008_0.Handled;
No_Reply (LA);
end Handle;
end C393008_2;
use C393008_2;
package Alert_Utilities is new
C393008_1 (Data_Type => Low_Alert_Type,
Update => Handle, -- Low_Alert's Handle
Initialize => Init); -- inherited from Alert
Item : Low_Alert_Type;
use type C393008_0.Status_Enum;
begin
Report.Test ("C393008", "Check that an extended type can be derived "&
"from an abstract type");
Item := Init;
if (Item.Status /= C393008_0.No_Status) or (Item.Serial /=1) then
Report.Failed ("Wrong initialization");
end if;
TCTouch.Validate("DC", "Initialization Call");
Alert_Utilities.Modify (Item);
if (Item.Status /= C393008_0.Handled) or (Item.Serial /= 3) then
Report.Failed ("Wrong results from Modify");
end if;
TCTouch.Validate("BDCECA", "Generic Instance Call");
Report.Result;
end C393008;
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