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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;
+