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-- 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;
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