-- 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;