| -- C393008.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. |
| --* |
| -- |
| -- TEST OBJECTIVE: |
| -- Check that an extended type can be derived from an abstract type. |
| -- |
| -- TEST DESCRIPTION: |
| -- Declare a tagged record; declare an abstract |
| -- primitive operation and a non-abstract primitive operation of the |
| -- type. Derive an extended type from it, including a new component. |
| -- Use the derived type, the overriding operation and the inherited |
| -- operation to instantiate a generic package. The overriding operation |
| -- calls a new primitive operation and an inherited operation [so the |
| -- instantiation must get this sorted out correctly]. |
| -- |
| -- |
| -- CHANGE HISTORY: |
| -- 06 Dec 94 SAIC ACVC 2.0 |
| -- |
| --! |
| |
| with Report; |
| with TCTouch; |
| procedure C393008 is |
| |
| package C393008_0 is |
| |
| type Status_Enum is (No_Status, Handled, Unhandled, Pending); |
| |
| type Alert_Type is abstract tagged record |
| Status : Status_Enum; |
| Reply : Boolean; |
| Urgent : Boolean; |
| end record; |
| |
| subtype Serial_Number is Integer range 0..Integer'last; |
| Serial_Num : Serial_Number := 0; |
| |
| procedure Handle (A : in out Alert_Type) is abstract; |
| -- abstract primitive operation |
| |
| -- the procedure Init would be _nice_ have this procedure be non_abstract |
| -- and create a "base" object with a "null" constraint. The language |
| -- will not allow this due to the restriction that an object of an |
| -- abstract type cannot be created. Hence Init must be abstract, |
| -- requiring any type derived directly from Alert_Type to declare |
| -- an Init. |
| -- |
| -- In light of this, I have changed init to a function to more closely |
| -- model the typical usage of OO features... |
| |
| function Init return Alert_Type is abstract; |
| |
| procedure No_Reply (A : in out Alert_Type); |
| |
| end C393008_0; |
| |
| --=======================================================================-- |
| |
| package body C393008_0 is |
| |
| procedure No_Reply (A : in out Alert_Type) is |
| begin -- primitive operation, not abstract |
| TCTouch.Touch('A'); ------------------------------------------------- A |
| if A.Status = Handled then |
| A.Reply := False; |
| end if; |
| end No_Reply; |
| |
| end C393008_0; |
| |
| --=======================================================================-- |
| |
| generic |
| -- pass in the Alert_Type object, including its |
| -- operations |
| type Data_Type is new C393008_0.Alert_Type with private; |
| -- note that Alert_Type is abstract, so it may not be |
| -- used as an actual parameter |
| with procedure Update (P : in out Data_Type) is <>; -- generic formal |
| with function Initialize return Data_Type is <>; -- generic formal |
| |
| package C393008_1 is |
| -- Utilities |
| |
| procedure Modify (Item : in out Data_Type); |
| |
| end C393008_1; |
| -- Utilities |
| |
| --=======================================================================-- |
| |
| package body C393008_1 is |
| -- Utilities |
| |
| procedure Modify (Item : in out Data_Type) is |
| begin |
| TCTouch.Touch('B'); --------------------------------------------- B |
| Item := Initialize; |
| Update (Item); |
| end Modify; |
| |
| end C393008_1; |
| |
| --=======================================================================-- |
| |
| package C393008_2 is |
| |
| type Low_Alert_Type is new C393008_0.Alert_Type with record |
| Serial : C393008_0.Serial_Number; |
| end record; |
| |
| procedure Serialize (LA : in out Low_Alert_Type); |
| |
| -- inherit No_Reply |
| |
| procedure Handle (LA : in out Low_Alert_Type); |
| |
| function Init return Low_Alert_Type; |
| end C393008_2; |
| |
| package body C393008_2 is |
| procedure Serialize (LA : in out Low_Alert_Type) is |
| begin -- new primitive operation |
| TCTouch.Touch('C'); ------------------------------------------------- C |
| C393008_0.Serial_Num := C393008_0.Serial_Num + 1; |
| LA.Serial := C393008_0.Serial_Num; |
| end Serialize; |
| |
| -- inherit No_Reply |
| |
| function Init return Low_Alert_Type is |
| TA: Low_Alert_Type; |
| begin |
| TCTouch.Touch('D'); ------------------------------------------------- D |
| Serialize( TA ); |
| TA.Status := C393008_0.No_Status; |
| return TA; |
| end Init; |
| |
| procedure Handle (LA : in out Low_Alert_Type) is |
| begin -- overrides abstract inherited Handle |
| TCTouch.Touch('E'); ------------------------------------------------- E |
| Serialize (LA); |
| LA.Reply := False; |
| LA.Status := C393008_0.Handled; |
| No_Reply (LA); |
| end Handle; |
| |
| end C393008_2; |
| |
| use C393008_2; |
| |
| package Alert_Utilities is new |
| C393008_1 (Data_Type => Low_Alert_Type, |
| Update => Handle, -- Low_Alert's Handle |
| Initialize => Init); -- inherited from Alert |
| |
| Item : Low_Alert_Type; |
| |
| use type C393008_0.Status_Enum; |
| |
| begin |
| |
| Report.Test ("C393008", "Check that an extended type can be derived "& |
| "from an abstract type"); |
| |
| Item := Init; |
| if (Item.Status /= C393008_0.No_Status) or (Item.Serial /=1) then |
| Report.Failed ("Wrong initialization"); |
| end if; |
| TCTouch.Validate("DC", "Initialization Call"); |
| |
| Alert_Utilities.Modify (Item); |
| if (Item.Status /= C393008_0.Handled) or (Item.Serial /= 3) then |
| Report.Failed ("Wrong results from Modify"); |
| end if; |
| TCTouch.Validate("BDCECA", "Generic Instance Call"); |
| |
| Report.Result; |
| |
| end C393008; |
