102 lines
3.6 KiB
Plaintext
102 lines
3.6 KiB
Plaintext
-- F393B00.A
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-- Alert_Foundation
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--
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-- Grant of Unlimited Rights
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--
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- unlimited rights in the software and documentation contained herein.
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- this public release, the Government intends to confer upon all
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-- recipients unlimited rights equal to those held by the Government.
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-- These rights include rights to use, duplicate, release or disclose the
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-- released technical data and computer software in whole or in part, in
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- to do so.
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--
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-- DISCLAIMER
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--
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- FOUNDATION DESCRIPTION:
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-- This package declares three abstract types for use in C660 series
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-- tests, Alert, Special_Alert, and Private_Alert.
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-- It models (in miniature) an application situation in which an
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-- abstraction is defined in terms of structure (record and operations
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-- on the record) but not in terms of content (record is null). It
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-- also models a situation in which an abstraction includes some
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-- specific, implementation dependent, information.
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--
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-- CHANGE HISTORY:
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-- 06 Dec 94 SAIC ACVC 2.0
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--
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--!
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package F393B00 is
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type Alert is abstract tagged null record; -- abstract type
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-- see procedure Handle below
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procedure Handle (A : in out Alert) is abstract;
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-- abstract procedure,
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-- explicitly declared
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type Private_Alert is abstract tagged private;
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procedure Handle (PA : in out Private_Alert) is abstract;
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-- ensures that Private_Alert
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-- is visibly abstract
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type Status_Kind is (Practice, Real, Dont_Care);
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type Urgency_Kind is (Low, Medium, High);
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type Practice_Alert is new Alert with record
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Status : Status_Kind := Dont_Care;
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Urgency : Urgency_Kind := Low;
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end record;
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procedure Handle (PA : in out Practice_Alert);
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-- overrides inherited Handle
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type Device is (Teletype, Console, Big_Screen);
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type Special_Alert (Age : Integer) is
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abstract new Practice_Alert with record
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Display : Device;
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end record;
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procedure Handle (SA : in out Special_Alert) is abstract;
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-- overrides inherited Handle
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private
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subtype Implementation_Detail is Integer range 1..10;
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type Private_Alert is abstract tagged record
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Private_Field : Implementation_Detail := 1;
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end record;
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end F393B00;
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--=======================================================================--
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package body F393B00 is
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procedure Handle (PA : in out Practice_Alert) is
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begin
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PA.Status := Real;
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PA.Urgency := Medium;
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end Handle;
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end F393B00;
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