| -- C392D01.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, for an implicitly declared dispatching operation that is |
| -- overridden, the body executed is the body for the overriding |
| -- subprogram, even if the overriding occurs in a private part. |
| -- Check that, for an implicitly declared dispatching operation that is |
| -- NOT overridden, the body executed is the body of the corresponding |
| -- subprogram of the parent type. |
| -- |
| -- Check for the case where the overriding (and non-overriding) operations |
| -- are declared for a private extension (and its full type) in a public |
| -- child unit of the package declaring the ancestor type, and the ancestor |
| -- type is a tagged private type whose full view is itself a derived type. |
| -- |
| -- TEST DESCRIPTION: |
| -- Consider: |
| -- |
| -- package Parent is |
| -- type Root is tagged ... |
| -- procedure Vis_Op (P: Root); |
| -- private |
| -- procedure Pri_Op (P: Root); -- (A) |
| -- end Parent; |
| -- |
| -- package Intermediate is |
| -- type Mid is tagged private; |
| -- private |
| -- type Mid is new Parent.Root with record ... |
| -- -- Implicit Vis_Op (P: Mid) declared here. |
| -- |
| -- procedure Vis_Op (P: Mid); -- (B) |
| -- end Intermediate; |
| -- |
| -- package Intermediate.Child is |
| -- type Derived is new Mid with private; |
| -- |
| -- procedure Pri_Op (P: Derived); -- (C) |
| -- ... |
| -- |
| -- private |
| -- type Derived is new Mid with record... |
| -- -- Implicit Vis_Op (P: Derived) declared here. |
| -- ... |
| -- end Intermediate.Child; |
| -- |
| -- Type Derived inherits Vis_Op from the parent type Mid. Note, however, |
| -- that it is implicitly declared in the private part (inherited |
| -- subprograms for a derived_type_definition -- in this case, the full |
| -- type -- are implicitly declared at the earliest place within the |
| -- immediate scope of the type_declaration where the corresponding |
| -- declaration from the parent is visible). |
| -- |
| -- Because Parent.Pri_Op is never visible within the immediate scope |
| -- of Mid, it is not implicitly declared for Mid. Thus, it is also not |
| -- implicitly declared for Derived. As a result, the version of Pri_Op |
| -- declared at (C) above does not override an inherited version of |
| -- Parent.Pri_Op and is totally unrelated to it. |
| -- |
| -- Dispatching calls with tag Mid will execute (A) and (B). Dispatching |
| -- calls with tag Derived from Parent will execute the bodies of (B) |
| -- and (A). Dispatching calls with tag Derived from Parent.Child |
| -- will execute the bodies of (B) and (C). |
| -- |
| -- TEST FILES: |
| -- The following files comprise this test: |
| -- |
| -- F392D00.A |
| -- C392D01.A |
| -- |
| -- |
| -- CHANGE HISTORY: |
| -- 06 Dec 94 SAIC ACVC 2.0 |
| -- |
| --! |
| |
| with F392D00; |
| package C392D01_0 is |
| |
| type Zoom_Camera is tagged private; |
| |
| procedure Self_Test (C : in out Zoom_Camera'Class); |
| |
| -- ...Additional operations. |
| |
| |
| function TC_Correct_Result (C : Zoom_Camera; |
| D : F392D00.Depth_Of_Field; |
| S : F392D00.Shutter_Speed) return Boolean; |
| |
| private |
| |
| type Magnification is (Low, Medium, High); |
| |
| type Zoom_Camera is new F392D00.Remote_Camera with record |
| Mag : Magnification; |
| end record; |
| |
| -- procedure Focus (C : in out Zoom_Camera; -- Implicitly |
| -- Depth : in Depth_Of_Field) -- declared |
| -- here. |
| |
| procedure Focus (C : in out Zoom_Camera; -- Overrides |
| Depth : in F392D00.Depth_Of_Field); -- inherited op. |
| |
| -- For the remote zoom camera, perhaps the focusing algorithm is different |
| -- in some way, so the original Focus operation is overridden here. |
| |
| -- Since the partial view is not an extension, the overriding operation |
| -- must be declared after the full type. This version of Focus, although |
| -- not visible for type Zoom_Camera from outside the package, can still be |
| -- dispatched to. |
| |
| |
| -- Note: F392D00.Set_Shutter_Speed is inherited by Zoom_Camera from |
| -- F392D00.Remote_Camera, but since the operation never becomes visible |
| -- within the immediate scope of Zoom_Camera, it is never implicitly |
| -- declared. |
| |
| end C392D01_0; |
| |
| |
| --==================================================================-- |
| |
| |
| package body C392D01_0 is |
| |
| procedure Focus (C : in out Zoom_Camera; |
| Depth : in F392D00.Depth_Of_Field) is |
| begin |
| -- Artificial for testing purposes. |
| C.DOF := 83; |
| end Focus; |
| |
| ----------------------------------------------------------- |
| -- Indirect call to F392D00.Self_Test since the main does not know |
| -- that Zoom_Camera is a private extension of F392D00.Basic_Camera. |
| procedure Self_Test (C : in out Zoom_Camera'Class) is |
| begin |
| F392D00.Self_Test (C); |
| -- ...Additional self-testing. |
| end Self_Test; |
| |
| ----------------------------------------------------------- |
| function TC_Correct_Result (C : Zoom_Camera; |
| D : F392D00.Depth_Of_Field; |
| S : F392D00.Shutter_Speed) return Boolean is |
| use type F392D00.Depth_Of_Field; |
| use type F392D00.Shutter_Speed; |
| begin |
| return (C.DOF = D and C.Shutter = S); |
| end TC_Correct_Result; |
| |
| end C392D01_0; |
| |
| |
| --==================================================================-- |
| |
| |
| with F392D00; |
| package C392D01_0.C392D01_1 is |
| |
| type Film_Speed is private; |
| |
| type Auto_Speed is new Zoom_Camera with private; |
| |
| -- Implicit function TC_Correct_Result (Auto_Speed) declared here. |
| |
| procedure Set_Shutter_Speed (C : in out Auto_Speed; |
| Speed : in F392D00.Shutter_Speed); |
| |
| -- This version of Set_Shutter_Speed does NOT override the operation |
| -- inherited from Zoom_Camera, because the inherited operation is never |
| -- visible (and thus, is never implicitly declared) within the immediate |
| -- scope of type Auto_Speed. |
| |
| procedure Self_Test (C : in out Auto_Speed'Class); |
| |
| -- ...Other operations. |
| |
| private |
| type Film_Speed is (One_Hundred, Two_Hundred, Four_Hundred); |
| |
| type Auto_Speed is new Zoom_Camera with record |
| ASA : Film_Speed; |
| end record; |
| |
| -- procedure Focus (C : in out Auto_Speed; -- Implicitly |
| -- Depth : in F392D00.Depth_Of_Field); -- declared |
| -- here. |
| |
| end C392D01_0.C392D01_1; |
| |
| |
| --==================================================================-- |
| |
| |
| package body C392D01_0.C392D01_1 is |
| |
| procedure Set_Shutter_Speed (C : in out Auto_Speed; |
| Speed : in F392D00.Shutter_Speed) is |
| begin |
| -- Artificial for testing purposes. |
| C.Shutter := F392D00.Two_Fifty; |
| end Set_Shutter_Speed; |
| |
| ------------------------------------------------------- |
| procedure Self_Test (C : in out Auto_Speed'Class) is |
| begin |
| -- Artificial for testing purposes. |
| Set_Shutter_Speed (C, F392D00.Thousand); |
| Focus (C, 27); |
| end Self_Test; |
| |
| end C392D01_0.C392D01_1; |
| |
| |
| --==================================================================-- |
| |
| |
| with F392D00; |
| with C392D01_0.C392D01_1; |
| |
| with Report; |
| |
| procedure C392D01 is |
| Zooming_Camera : C392D01_0.Zoom_Camera; |
| Auto_Camera1 : C392D01_0.C392D01_1.Auto_Speed; |
| Auto_Camera2 : C392D01_0.C392D01_1.Auto_Speed; |
| |
| TC_Expected_Zoom_Depth : constant F392D00.Depth_Of_Field := 83; |
| TC_Expected_Auto_Depth : constant F392D00.Depth_Of_Field := 83; |
| TC_Expected_Depth : constant F392D00.Depth_Of_Field := 83; |
| TC_Expected_Zoom_Speed : constant F392D00.Shutter_Speed |
| := F392D00.Thousand; |
| TC_Expected_Auto_Speed : constant F392D00.Shutter_Speed |
| := F392D00.Thousand; |
| TC_Expected_Speed : constant F392D00.Shutter_Speed |
| := F392D00.Two_Fifty; |
| |
| use type F392D00.Depth_Of_Field; |
| use type F392D00.Shutter_Speed; |
| |
| begin |
| Report.Test ("C392D01", "Dispatching for overridden and non-overridden " & |
| "primitive subprograms: private extension declared in child " & |
| "unit, parent is tagged private whose full view is derived " & |
| "type"); |
| |
| |
| |
| -- Call the class-wide operation (Self_Test) for Zoom_Camera'Class, which |
| -- itself calls the class-wide operation for Remote_Camera'Class, which |
| -- in turn makes dispatching calls to Focus and Set_Shutter_Speed: |
| |
| |
| -- For an object of type Zoom_Camera, the dispatching call to Focus should |
| -- dispatch to the body explicitly declared for Zoom_Camera. The dispatching |
| -- to Set_Shutter_Speed should dispatch to the body declared for |
| -- Remote_Camera: |
| |
| C392D01_0.Self_Test(Zooming_Camera); |
| |
| if not C392D01_0.TC_Correct_Result (Zooming_Camera, |
| TC_Expected_Zoom_Depth, |
| TC_Expected_Zoom_Speed) |
| then |
| Report.Failed ("Calls dispatched incorrectly for tagged private type"); |
| end if; |
| |
| -- For an object of type Auto_Speed, the dispatching call to Focus should |
| -- dispatch to the body explicitly declared for Zoom_Camera. The dispatching |
| -- call to Set_Shutter_Speed should dispatch to the body explicitly declared |
| -- for Remote_Camera: |
| |
| C392D01_0.Self_Test(Auto_Camera1); |
| |
| if not C392D01_0.C392D01_1.TC_Correct_Result (Auto_Camera1, |
| TC_Expected_Auto_Depth, |
| TC_Expected_Auto_Speed) |
| then |
| Report.Failed ("Calls dispatched incorrectly for private extension"); |
| end if; |
| |
| -- Call to Self_Test from C392D01_0.C392D01_1 invokes the dispatching call |
| -- to Focus which should dispatch to the body explicitly declared for |
| -- Zoom_Camera. The dispatching call to Set_Shutter_Speed should dispatch |
| -- to the body explicitly declared for Auto_Speed: |
| |
| C392D01_0.C392D01_1.Self_Test(Auto_Camera2); |
| |
| if not C392D01_0.C392D01_1.TC_Correct_Result (Auto_Camera2, |
| TC_Expected_Depth, |
| TC_Expected_Speed) |
| then |
| Report.Failed ("Call to explicit subprogram executed the wrong body"); |
| end if; |
| |
| Report.Result; |
| |
| end C392D01; |
