cc51d01.a

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-- CC51D01.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, in an instance, each implicit declaration of a user-defined
--      subprogram of a formal private extension declares a view of the
--      corresponding primitive subprogram of the ancestor, and that if the
--      tag in a call is statically determined to be that of the formal type,
--      the body executed will be that corresponding to the actual type.
--
--      Check subprograms declared within a generic formal package. Check for
--      the case where the actual type passed to the formal private extension
--      is a specific tagged type. Check for several types in the same class.
--
--
-- TEST DESCRIPTION:
--      Declare a list abstraction in a generic package which manages lists of
--      elements of any nonlimited type (foundation code). Declare a package
--      which declares a tagged type and a type derived from it. Declare an
--      operation for the root tagged type and override it for the derived
--      type. Derive a type from this derived type, but do not override the
--      operation. Declare a generic subprogram which operates on lists of
--      elements of tagged types. Provide the generic subprogram with two
--      formal parameters: (1) a formal derived tagged type which represents a
--      list element type, and (2) a generic formal package with the list
--      abstraction package as template. Use the formal derived type as the
--      generic formal actual part for the formal package. Within the generic
--      subprogram, call the operation of the root tagged type. In the main
--      program, instantiate the generic list package and the generic
--      subprogram with the root tagged type and each derivative, then call
--      each instance with an object of the appropriate type.
--
-- TEST FILES:
--      The following files comprise this test:
--
--         FC51D00.A
--      -> CC51D01.A
--
--
-- CHANGE HISTORY:
--      06 Dec 94   SAIC    ACVC 2.0
--      04 Jan 95   SAIC    Moved declaration of type Ranked_ID_Type from
--                          main subprogram to package CC51D01_0. Removed
--                          case passing class-wide actual to instance.
--                          Updated test description and modified comments.
--
--!

package CC51D01_0 is -- This package simulates support for a personnel
                     -- database.

   type SSN_Type is new String (1 .. 9);

   type Blind_ID_Type is tagged record                   -- Root type of
      SSN : SSN_Type;                                    -- class.
      -- ... Other components.
   end record;

   procedure Update_ID (Item : in out Blind_ID_Type);    -- Parent operation.

   -- ... Other operations.


   type Name_Type is new String (1 .. 9);

   type Named_ID_Type is new Blind_ID_Type with record   -- Direct derivative
      Name : Name_Type := "Doe      ";                   -- of root type.
      -- ... Other components.
   end record;

   -- Inherits Update_ID from parent.

   procedure Update_ID (Item : in out Named_ID_Type);    -- Overrides parent's
                                                         -- implementation.


   type Ranked_ID_Type is new Named_ID_Type with record
      Level : Integer := 0;                              -- Indirect derivative
      -- ... Other components.                           -- of root type.
   end record;

   -- Inherits Update_ID from parent.

end CC51D01_0;


     --==================================================================--


package body CC51D01_0 is

   -- The implementations of Update_ID are purely artificial; the validity of
   -- their implementations in the context of the abstraction is irrelevant to
   -- the feature being tested.

   procedure Update_ID (Item : in out Blind_ID_Type) is
   begin
      Item.SSN := "111223333";
   end Update_ID;


   procedure Update_ID (Item : in out Named_ID_Type) is
   begin
      Item.SSN := "444556666";
      -- ... Other stuff.
   end Update_ID;

end CC51D01_0;


     --==================================================================--


--                           --
-- Formal package used here. --
--                           --

with FC51D00;    -- Generic list abstraction.
with CC51D01_0;  -- Tagged type declarations.
generic          -- This procedure simulates a generic operation for types
                 -- in the class rooted at Blind_ID_Type.
   type Elem_Type is new CC51D01_0.Blind_ID_Type with private;
   with package List_Mgr is new FC51D00 (Elem_Type);
procedure CC51D01_1 (L : in out List_Mgr.List_Type; E : in Elem_Type);


     --==================================================================--


-- The implementation of CC51D01_1 is purely artificial; the validity
-- of its implementation in the context of the abstraction is irrelevant
-- to the feature being tested.
--
-- The expected behavior here is as follows: for each actual type corresponding
-- to Elem_Type, the call to Update_ID should invoke the actual type's
-- implementation, which updates the object's SSN field. Write_Element then
-- adds the object to the list.

procedure CC51D01_1 (L : in out List_Mgr.List_Type; E : in Elem_Type) is
   Element : Elem_Type := E;   -- Can't update IN parameter.
begin
   Update_ID (Element);                    -- Executes actual type's version.
   List_Mgr.Write_Element (1, L, Element); -- Executes actual type's version.
end CC51D01_1;


     --==================================================================--


with FC51D00;    -- Generic list abstraction.
with CC51D01_0;  -- Tagged type declarations.
with CC51D01_1;  -- Generic operation.

with Report;
procedure CC51D01 is

   use CC51D01_0;                                        -- All types & ops
                                                         -- directly visible.

   -- Begin test code declarations: -----------------------

   TC_Expected_1 : Blind_ID_Type       := (SSN => "111223333");
   TC_Expected_2 : Named_ID_Type       := ("444556666", "Doe      ");
   TC_Expected_3 : Ranked_ID_Type      := ("444556666", "Doe      ", 0);

   TC_Initial_1  : Blind_ID_Type       := (SSN => "777889999");
   TC_Initial_2  : Named_ID_Type       := ("777889999", "Doe      ");
   TC_Initial_3  : Ranked_ID_Type      := ("777889999", "Doe      ", 0);

   -- End test code declarations. -------------------------


   -- Begin instantiations and list declarations: ---------

   -- At this point in an application, the generic list package would be
   -- instantiated for one of the visible tagged types. Next, the generic
   -- subprogram would be instantiated for the same tagged type and the
   -- preceding list package instance.
   --
   -- In order to cover all the important cases, this test instantiates several
   -- packages and subprograms (probably more than would typically appear
   -- in user code).

   -- Support for lists of blind IDs:

   package Blind_Lists is new FC51D00 (Blind_ID_Type);
   procedure Update_and_Write is new CC51D01_1 (Blind_ID_Type, Blind_Lists);
   Blind_List : Blind_Lists.List_Type;


   -- Support for lists of named IDs:

   package Named_Lists is new FC51D00 (Named_ID_Type);
   procedure Update_and_Write is new                     -- Overloads subprog
     CC51D01_1 (Elem_Type => Named_ID_Type,              -- for Blind_ID_Type.
                List_Mgr  => Named_Lists);
   Named_List : Named_Lists.List_Type;


   -- Support for lists of ranked IDs:

   package Ranked_Lists is new FC51D00 (Ranked_ID_Type);
   procedure Update_and_Write is new                     -- Overloads.
     CC51D01_1 (Elem_Type => Ranked_ID_Type,
                List_Mgr  => Ranked_Lists);
   Ranked_List : Ranked_Lists.List_Type;

   -- End instantiations and list declarations. -----------


begin
   Report.Test ("CC51D01", "Formal private extension, specific tagged "   &
                "type actual: body of primitive subprogram executed is "  &
                "that of actual type. Check for subprograms declared in " &
                "a formal package");


   Update_and_Write (Blind_List, TC_Initial_1);

   if (Blind_Lists.View_Element (1, Blind_List) /= TC_Expected_1) then
      Report.Failed ("Wrong result for root tagged type");
   end if;


   Update_and_Write (Named_List, TC_Initial_2);

   if (Named_Lists.View_Element (1, Named_List) /= TC_Expected_2) then
      Report.Failed ("Wrong result for type derived directly from root");
   end if;


   Update_and_Write (Ranked_List, TC_Initial_3);

   if (Ranked_Lists.View_Element (1, Ranked_List) /= TC_Expected_3) then
      Report.Failed ("Wrong result for type derived indirectly from root");
   end if;


   Report.Result;
end CC51D01;