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1 149 jeremybenn
-- C730003.A
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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 and
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--     F08630-91-C-0015, the U.S. Government obtained unlimited rights in the
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--     software and documentation contained herein.  Unlimited rights are
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--     defined in DFAR 252.227-7013(a)(19).  By making this public release,
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--     the Government intends to confer upon all recipients unlimited rights
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--     equal to those held by the Government.  These rights include rights to
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--     use, duplicate, release or disclose the released technical data and
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--     computer software in whole or in part, in any manner and for any purpose
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--     whatsoever, and to have or permit others 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 WHATSOVER, 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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-- OBJECTIVE:
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--      Check that the characteristics of a type derived from a private
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--      extension (outside the scope of the full view) are those defined by
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--      the partial view of the private extension.
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--      In particular, check that a component of the derived type may be
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--      explicitly declared with the same name as a component declared for
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--      the full view of the private extension.
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--      Check that a component defined in the private extension of a type
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--      may be updated through a view conversion of a type derived from
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--      the type.
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--
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-- TEST DESCRIPTION:
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--      Consider:
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--
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--      package Parent is
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--         type T is tagged record
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--            ...
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--         end record;
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--
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--         type DT is new T with private;
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--         procedure Op1 (P: in out DT);
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--
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--      private
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--         type DT is new T with record
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--            Y: ...;                                             -- (A)
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--         end record;
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--      end Parent;
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--
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--      package body Parent is
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--         function Op1 (P: in DT) return ... is
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--         begin
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--            return P.Y;
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--         end Op1;
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--      end Parent;
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--
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--      package Unrelated is
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--         type Intermediate is new DT with record
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--            Y: ...;  -- Note: same name as component of         -- (B)
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--                     --       parent's full view.
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--         end record;
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--      end Unrelated;
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--
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--      package Parent.Child is
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--         type DDT is new Intermediate with null record;
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--         -- Implicit declared Op1 (P.DDT);                      -- (C)
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--
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--         procedure Op2 (P: in out DDT);
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--      end Parent.Child;
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--
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--      package body Parent.Child is
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--         procedure Op2 (P: in out DDT) is
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--            Obj : DT renames DT(P);
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--         begin
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--            ...
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--            P.Y := ...;      -- Updates DDT's Y.                -- (D)
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--            DT(P).Y := ...;  -- Updates DT's Y.                 -- (E)
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--            Obj.Y := ...;    -- Updates DT's Y.                 -- (F)
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--         end Op2;
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--      end Parent.Child;
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--
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--      Types DT and DDT both declare a component Y at (A) and (B),
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--      respectively. The component Y of the full view of DT is not visible
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--      at the place where DDT is declared. Therefore, it is invisible for
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--      all views of DDT (although it still exists for objects of DDT), and
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--      it is legal to declare another component for DDT with the same name.
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--
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--      DDT inherits the primitive subprogram Op1 from DT at (C). Op1 returns
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--      the component Y; for calls with an operand of type DDT, Op1 returns
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--      the Y inherited from DT, not the new Y explicitly declared for DDT,
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--      even though the inherited Y is not visible for any view of DDT.
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--
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--      Within the body of Op2, the assignment statement at (D) updates the
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--      Y explicitly declared for DDT. At (E) and (F), however, a view
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--      conversion denotes a new view of P as an object of type DT, which
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--      enables access to the Y from the full view of DT. Thus, the
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--      assignment statements at (E) and (F) update the (invisible) Y from DT.
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--
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--      Note that the above analysis would be wrong if the new component Y
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--      were declared directly in Child.  In that case, the two same-named
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--      components would be illegal -- see AI-150.
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--
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--
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-- CHANGE HISTORY:
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--      06 Dec 1994   SAIC    ACVC 2.0
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--      29 JUN 1999   RAD     Declare same-named component in an
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--                            unrelated package -- see AI-150.
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--
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--!
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package C730003_0 is
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   type Suit_Kind is (Clubs, Diamonds, Hearts, Spades);
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   type Face_Kind is (Up, Down);
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   type Playing_Card is tagged record
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      Face: Face_Kind;
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      Suit: Suit_Kind;
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   end record;
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   procedure Turn_Over_Card (Card : in out Playing_Card);
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   type Disp_Card is new Playing_Card with private;
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   subtype ASCII_Representation is Natural range 1..14;
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   function Get_Private_View (A_Card : Disp_Card) return ASCII_Representation;
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private
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   type Disp_Card is new Playing_Card with record
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      View: ASCII_Representation;                                       -- (A)
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   end record;
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end C730003_0;
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--==================================================================--
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package body C730003_0 is
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   procedure Turn_Over_Card (Card: in out Playing_Card) is
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   begin
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      Card.Face := Up;
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   end Turn_Over_Card;
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   function Get_Private_View (A_Card : Disp_Card)
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     return ASCII_Representation is
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   begin
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      return A_Card.View;
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   end Get_Private_View;
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end C730003_0;
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--==================================================================--
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with C730003_0; use C730003_0;
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package C730003_1 is
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   subtype Graphic_Representation is String (1 .. 2);
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   type Graphic_Card is new Disp_Card with record
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      View : Graphic_Representation;                                    -- (B)
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                                          -- "Duplicate" component field name.
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   end record;
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end C730003_1;
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--==================================================================--
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with C730003_1; use C730003_1;
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package C730003_0.C730003_2 is
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   Queen_Of_Spades   : constant C730003_0.ASCII_Representation := 12;
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   Ace_Of_Hearts     : constant String := "AH";
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   Close_To_The_Vest : constant C730003_0.ASCII_Representation := 14;
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   Read_Em_And_Weep  : constant String := "AA";
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   type Graphic_Card is new C730003_1.Graphic_Card with null record;
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   -- Implicit function Get_Private_View                                -- (C)
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   --           (A_Card : Graphic_Card) return C730003_0.ASCII_Representation;
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   function  Get_View       (Card : Graphic_Card) return String;
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   procedure Update_View    (Card : in out Graphic_Card);
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   procedure Hide_From_View (Card : in out Graphic_Card);
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end C730003_0.C730003_2;
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--==================================================================--
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package body C730003_0.C730003_2 is
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   function Get_View (Card : Graphic_Card) return String is
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   begin
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      return Card.View;
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   end Get_View;
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   procedure Update_View (Card : in out Graphic_Card) is
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      ASCII_View      : Disp_Card renames Disp_Card(Card); -- View conversion.
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   begin
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      ASCII_View.View := Queen_Of_Spades;                               -- (F)
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                                              -- Assignment to "hidden" field.
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      Card.View       := Ace_Of_Hearts;                                 -- (D)
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                                 -- Assignment to Graphic_Card declared field.
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   end Update_View;
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   procedure Hide_From_View (Card : in out Graphic_Card) is
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   begin
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      -- Update both of Card's View components.
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      Disp_Card(Card).View := Close_To_The_Vest;                        -- (E)
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                                              -- Assignment to "hidden" field.
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      Card.View            := Read_Em_And_Weep;                         -- (D)
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                                 -- Assignment to Graphic_Card declared field.
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   end Hide_From_View;
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end C730003_0.C730003_2;
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--==================================================================--
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with C730003_0;
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with C730003_0.C730003_2;
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with Report;
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procedure C730003 is
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begin
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   Report.Test ("C730003", "Check that the characteristics of a type "   &
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                           "derived from a private extension (outside "  &
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                           "the scope of the full view) are those "      &
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                           "defined by the partial view of the private " &
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                           "extension");
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   Check_Your_Cards:
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   declare
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      use C730003_0;
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      use C730003_0.C730003_2;
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      Top_Card_On_The_Deck : Graphic_Card;
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   begin
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      -- Update value in the components of the card.  There are two
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      -- component fields named View, although one is not visible for
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      -- any view of a Graphic_Card.
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      Update_View(Top_Card_On_The_Deck);
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      -- Verify that both "View" components of the card have been updated.
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      if Get_View(Top_Card_On_The_Deck) /= Ace_Of_Hearts then
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         Report.Failed ("Incorrect value in visible component - 1");
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      end if;
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      if Get_Private_View(Top_Card_On_The_Deck) /= Queen_Of_Spades
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      then
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         Report.Failed ("Incorrect value in non-visible component - 1");
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      end if;
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      -- Again, update the components of the card (to blank values).
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      Hide_From_View(Top_Card_On_The_Deck);
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      -- Verify that both components have been updated.
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      if Get_View(Top_Card_On_The_Deck) /= Read_Em_And_Weep then
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         Report.Failed ("Incorrect value in visible component - 2");
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      end if;
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      if Get_Private_View(Top_Card_On_The_Deck) /= Close_To_The_Vest
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      then
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         Report.Failed ("Incorrect value in non-visible component - 2");
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      end if;
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   exception
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      when others => Report.Failed("Exception raised in test block");
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   end Check_Your_Cards;
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   Report.Result;
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end C730003;

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