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1 149 jeremybenn
-- 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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