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-- F393B00.A
-- Alert_Foundation
--
-- 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.
--*
--
-- FOUNDATION DESCRIPTION:
-- This package declares three abstract types for use in C660 series
-- tests, Alert, Special_Alert, and Private_Alert.
-- It models (in miniature) an application situation in which an
-- abstraction is defined in terms of structure (record and operations
-- on the record) but not in terms of content (record is null). It
-- also models a situation in which an abstraction includes some
-- specific, implementation dependent, information.
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
package F393B00 is
type Alert is abstract tagged null record; -- abstract type
-- see procedure Handle below
procedure Handle (A : in out Alert) is abstract;
-- abstract procedure,
-- explicitly declared
type Private_Alert is abstract tagged private;
procedure Handle (PA : in out Private_Alert) is abstract;
-- ensures that Private_Alert
-- is visibly abstract
type Status_Kind is (Practice, Real, Dont_Care);
type Urgency_Kind is (Low, Medium, High);
type Practice_Alert is new Alert with record
Status : Status_Kind := Dont_Care;
Urgency : Urgency_Kind := Low;
end record;
procedure Handle (PA : in out Practice_Alert);
-- overrides inherited Handle
type Device is (Teletype, Console, Big_Screen);
type Special_Alert (Age : Integer) is
abstract new Practice_Alert with record
Display : Device;
end record;
procedure Handle (SA : in out Special_Alert) is abstract;
-- overrides inherited Handle
private
subtype Implementation_Detail is Integer range 1..10;
type Private_Alert is abstract tagged record
Private_Field : Implementation_Detail := 1;
end record;
end F393B00;
--=======================================================================--
package body F393B00 is
procedure Handle (PA : in out Practice_Alert) is
begin
PA.Status := Real;
PA.Urgency := Medium;
end Handle;
end F393B00;
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