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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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