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-- C3A0013.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.

--*

--

-- OBJECTIVE:

--      Check that a general access type object may reference allocated

--      pool objects as well as aliased objects. (3,4)

--      Check that formal parameters of tagged types are implicitly

--      defined as aliased; check that the 'Access of these formal

--      parameters designates the correct object with the correct

--      tag. (5)

--      Check that the current instance of a limited type is defined as

--      aliased. (5)

--

-- TEST DESCRIPTION:

--      This test takes from the hierarchy defined in C390003; making

--      the root type Vehicle limited private.  It also shifts the

--      abstraction to include the notion of a transmission, an object

--      which is contained within any vehicle.  Using an access

--      discriminant, any subprogram which operates on a transmission

--      may also reference the vehicle in which it is installed.

--

--      Class Hierarchy:

--              Vehicle         Transmission

--               /   \

--           Truck    Car

--

--      Contains:

--                Vehicle( Transmission )

--

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      16 Dec 94   SAIC    Fixed accessibility problems

--

--!

package C3A0013_1 is

  type Vehicle is tagged limited private;

  type Vehicle_ID is access all Vehicle'Class;

  -- Constructors

  procedure Create     ( It : in out Vehicle;

                         Wheels : Natural := 4 );

  -- Modifiers

  procedure Accelerate ( It : in out Vehicle );

  procedure Decelerate ( It : in out Vehicle );

  procedure Up_Shift   ( It : in out Vehicle );

  procedure Stop       ( It : in out Vehicle );

  -- Selectors

  function  Speed      ( It : Vehicle ) return Natural;

  function  Wheels     ( It : Vehicle ) return Natural;

  function  Gear_Factor( It : Vehicle ) return Natural;

  -- TC_Ops

  procedure TC_Validate( It : in out Vehicle; Speed_Trap : Natural );

  -- dispatching procedure used to check tag correctness

  procedure TC_Validate( It     : Vehicle;

                         TC_ID  : Character);

private

  type Transmission(Within: access Vehicle'Class) is limited record

    Engaged : Boolean := False;

    Gear    : Integer range -1..5 := 0;

  end record;

  -- Current instance of a limited type is defined as aliased

  type Vehicle is tagged limited record

    Wheels: Natural;

    Speed : Natural;

    Power_Train: Transmission( Vehicle'Access );

  end record;

end C3A0013_1;

with C3A0013_1;

package C3A0013_2 is

  type Car is new C3A0013_1.Vehicle with private;

  procedure TC_Validate( It     : Car;

                         TC_ID  : Character);

  function  Gear_Factor( It : Car ) return Natural;

private

  type Car is new C3A0013_1.Vehicle with record

    Displacement : Natural;

  end record;

end C3A0013_2;

with C3A0013_1;

package C3A0013_3 is

  type Truck is new C3A0013_1.Vehicle with private;

  procedure TC_Validate( It     : Truck;

                         TC_ID  : Character);

  function  Gear_Factor( It : Truck ) return Natural;

private

  type Truck is new C3A0013_1.Vehicle with record

    Displacement : Natural;

  end record;

end C3A0013_3;

with Report;

package body C3A0013_1 is

  procedure Create    ( It : in out Vehicle;

                        Wheels : Natural := 4 ) is

  begin

    It.Wheels   := Wheels;

    It.Speed    := 0;

  end Create;

  procedure Accelerate( It : in out Vehicle ) is

  begin

    It.Speed := It.Speed + Gear_Factor( It.Power_Train.Within.all );

  end Accelerate;

  procedure Decelerate( It : in out Vehicle ) is

  begin

    It.Speed := It.Speed - Gear_Factor( It.Power_Train.Within.all );

  end Decelerate;

  procedure Stop      ( It : in out Vehicle ) is

  begin

    It.Speed := 0;

    It.Power_Train.Engaged := False;

  end Stop;

  function  Gear_Factor( It : Vehicle ) return Natural is

  begin

    return It.Power_Train.Gear;

  end Gear_Factor;

  function  Speed     ( It : Vehicle ) return Natural is

  begin

    return It.Speed;

  end Speed;

  function  Wheels     ( It : Vehicle ) return Natural is

  begin

    return It.Wheels;

  end Wheels;

  -- formal tagged parameters are implicitly aliased

  procedure TC_Validate( It : in out Vehicle; Speed_Trap : Natural ) is

    License: Vehicle_ID := It'Unchecked_Access;

  begin

    if Speed( License.all ) /= Speed_Trap then

      Report.Failed("Speed Trap: expected: " & Natural'Image(Speed_Trap));

    end if;

  end TC_Validate;

  procedure TC_Validate( It     : Vehicle;

                         TC_ID  : Character) is

  begin

    if TC_ID /= 'V' then

      Report.Failed("Dispatched to Vehicle");

    end if;

    if Wheels( It ) /= 1 then

      Report.Failed("Not a Vehicle");

    end if;

  end TC_Validate;

  procedure Up_Shift( It: in out Vehicle ) is

  begin

    It.Power_Train.Gear    := It.Power_Train.Gear +1;

    It.Power_Train.Engaged := True;

    Accelerate( It );

  end Up_Shift;

end C3A0013_1;

with Report;

package body C3A0013_2 is

  procedure TC_Validate( It     : Car;

                         TC_ID  : Character ) is

  begin

    if TC_ID /= 'C' then

      Report.Failed("Dispatched to Car");

    end if;

    if Wheels( It ) /= 4 then

      Report.Failed("Not a Car");

    end if;

  end TC_Validate;

  function  Gear_Factor( It : Car ) return Natural is

  begin

    return C3A0013_1.Gear_Factor( C3A0013_1.Vehicle( It ) )*2;

  end Gear_Factor;

end C3A0013_2;

with Report;

package body C3A0013_3 is

  procedure TC_Validate( It     : Truck;

                         TC_ID  : Character) is

  begin

    if TC_ID /= 'T' then

      Report.Failed("Dispatched to Truck");

    end if;

    if Wheels( It ) /= 3 then

      Report.Failed("Not a Truck");

    end if;

  end TC_Validate;

  function  Gear_Factor( It : Truck ) return Natural is

  begin

    return C3A0013_1.Gear_Factor( C3A0013_1.Vehicle( It ) )*3;

  end Gear_Factor;

end C3A0013_3;

package C3A0013_4 is

  procedure Perform_Tests;

end C3A0013_4;

with Report;

with C3A0013_1;

with C3A0013_2;

with C3A0013_3;

package body C3A0013_4 is

  package Root   renames C3A0013_1;

  package Cars   renames C3A0013_2;

  package Trucks renames C3A0013_3;

  type Car_Pool is array(1..4) of aliased Cars.Car;

  Commuters : Car_Pool;

  My_Car      : aliased Cars.Car;

  Company_Car : Root.Vehicle_ID;

  Repair_Shop : Root.Vehicle_ID;

  The_Vehicle : Root.Vehicle;

  The_Car     : Cars.Car;

  The_Truck   : Trucks.Truck;

  procedure TC_Dispatch( Ptr   : Root.Vehicle_ID;

                         Char  : Character ) is

  begin

    Root.TC_Validate( Ptr.all, Char );

  end TC_Dispatch;

  procedure TC_Check_Formal_Access( Item: in out Root.Vehicle'Class;

                                    Char: Character) is

  begin

    TC_Dispatch( Item'Unchecked_Access, Char );

  end TC_Check_Formal_Access;

  procedure Perform_Tests is

  begin  -- Main test procedure.

  for Lane in Commuters'Range loop

    Cars.Create( Commuters(Lane) );

    for Excitement in 1..Lane loop

      Cars.Up_Shift( Commuters(Lane) );

    end loop;

  end loop;

  Cars.Create( My_Car );

  Cars.Up_Shift( My_Car );

  Cars.TC_Validate( My_Car, 2 );

  Root.Create( The_Vehicle, 1 );

  Cars.Create( The_Car    , 4 );

  Trucks.Create( The_Truck, 3 );

  TC_Check_Formal_Access( The_Vehicle, 'V' );

  TC_Check_Formal_Access( The_Car,     'C' );

  TC_Check_Formal_Access( The_Truck,   'T' );

  Root.Up_Shift( The_Vehicle );

  Cars.Up_Shift( The_Car );

  Trucks.Up_Shift( The_Truck );

  Root.TC_Validate( The_Vehicle, 1 );

  Cars.TC_Validate( The_Car, 2 );

  Trucks.TC_Validate( The_Truck, 3 );

  --  general access type may reference allocated objects

  Company_Car := new Cars.Car;

  Root.Create( Company_Car.all );

  Root.Up_Shift( Company_Car.all );

  Root.Up_Shift( Company_Car.all );

  Root.TC_Validate( Company_Car.all, 6 );

  --  general access type may reference aliased objects

  Repair_Shop := My_Car'Access;

  Root.TC_Validate( Repair_Shop.all, 2 );

  --  general access type may reference aliased objects

  Construction: declare

    type Speed_List is array(Commuters'Range) of Natural;

    Accelerations : constant Speed_List := (2, 6, 12, 20);

  begin

    for Rotation in Commuters'Range loop

      Repair_Shop := Commuters(Rotation)'Access;

      Root.TC_Validate( Repair_Shop.all, Accelerations(Rotation) );

    end loop;

  end Construction;

end Perform_Tests;

end C3A0013_4;

with C3A0013_4;

with Report;

procedure C3A0013 is

begin

  Report.Test ("C3A0013", "Check general access types.  Check aliased "

                        & "nature of formal tagged type parameters.  "

                        & "Check aliased nature of the current "

                        & "instance of a limited type.  Check the "

                        & "constraining of actual subtypes for "

                        & "discriminated objects" );

  C3A0013_4.Perform_Tests;

  Report.Result;

end C3A0013;