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|
-- C460005.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 a view conversion of a tagged type that is the left
-- side of an assignment statement, the assignment assigns to the
-- corresponding part of the object denoted by the operand.
--
-- TEST DESCRIPTION:
-- View conversions of class-wide operands to specific types are
-- placed on the right and left sides of assignment statements, and
-- conversions of class-wide operands to class-wide types are used
-- as actual parameters to dispatching operations. In all cases, a
-- check is made that Constraint_Error is raised if the tag of the
-- operand does not identify a specific type covered by or descended
-- from the target type, and not raised otherwise.
--
-- For the cases where the view conversion is the left side of an
-- assignment statement, and Constraint_Error should not be raised,
-- an additional check is made that only the corresponding portion
-- of the operand is updated by the assignment. For example:
--
-- type T is tagged record
-- C1 : Integer := 0;
-- end record;
--
-- type DT is new T with record
-- C2 : Integer := 0;
-- end record;
--
-- A : T := (C1 => 5);
-- B : DT := (C1 => 0, C2 => 10);
-- CWDT : T'Class := B;
--
-- T(CWDT) := A; -- Updates component C1; C2 remains unchanged.
-- -- Value of CWDT is (C1 => 5, C2 => 10).
--
--
-- CHANGE HISTORY:
-- 31 Jul 95 SAIC Initial prerelease version.
-- 22 Apr 96 SAIC ACVC 2.1: Added a check for correct tag.
-- 08 Sep 96 SAIC ACVC 2.1: Modified Report.Test.
--
--!
package C460005_0 is
type Tag_Type is tagged record
C1 : Natural;
end record;
procedure Proc (X : in out Tag_Type);
type DTag_Type is new Tag_Type with record
C2 : String (1 .. 5);
end record;
procedure Proc (X : in out DTag_Type);
type DDTag_Type is new DTag_Type with record
C3 : String (1 .. 5);
end record;
procedure Proc (X : in out DDTag_Type);
end C460005_0;
--==================================================================--
package body C460005_0 is
procedure Proc (X : in out Tag_Type) is
begin
X.C1 := 25;
end Proc;
-----------------------------------------
procedure Proc (X : in out DTag_Type) is
begin
Proc ( Tag_Type(X) );
X.C2 := "Earth";
end Proc;
-----------------------------------------
procedure Proc (X : in out DDTag_Type) is
begin
Proc ( DTag_Type(X) );
X.C3 := "Orbit";
end Proc;
end C460005_0;
--==================================================================--
with C460005_0;
use C460005_0;
with Report;
procedure C460005 is
Tag_Type_Init : constant Tag_Type := (C1 => 0);
DTag_Type_Init : constant DTag_Type := (Tag_Type_Init with "Hello");
DDTag_Type_Init : constant DDTag_Type := (DTag_Type_Init with "World");
Tag_Type_Value : constant Tag_Type := (C1 => 25);
DTag_Type_Value : constant DTag_Type := (Tag_Type_Value with "Earth");
DDTag_Type_Value : constant DDTag_Type := (DTag_Type_Value with "Orbit");
Tag_Type_Res : constant Tag_Type := (C1 => 25);
DTag_Type_Res : constant DTag_Type := (Tag_Type_Res with "Hello");
DDTag_Type_Res : constant DDTag_Type := (DTag_Type_Res with "World");
begin
Report.Test ("C460005", "Check that, for a view conversion of a tagged " &
"type that is the left side of an assignment statement, " &
"the assignment assigns to the corresponding part of the " &
"object denoted by the operand");
declare
procedure CW_Proc (P : Tag_Type'Class) is
Operand : Tag_Type'Class := P;
begin
Tag_Type(Operand) := Tag_Type_Value;
if (Operand /= Tag_Type'Class (Tag_Type_Value)) then
Report.Failed ("Operand has wrong value: #01");
end if;
exception
when Constraint_Error =>
Report.Failed ("Constraint_Error raised: #01");
when others =>
Report.Failed ("Unexpected exception: #01");
end CW_Proc;
begin
CW_Proc (Tag_Type_Init);
end;
----------------------------------------------------------------------
declare
procedure CW_Proc (P : Tag_Type'Class) is
Operand : Tag_Type'Class := P;
begin
DTag_Type(Operand) := DTag_Type_Value;
Report.Failed ("Constraint_Error not raised: #02");
exception
when Constraint_Error => null; -- expected exception
when others => Report.Failed ("Unexpected exception: #02");
end CW_Proc;
begin
CW_Proc (Tag_Type_Init);
end;
----------------------------------------------------------------------
declare
procedure CW_Proc (P : Tag_Type'Class) is
Operand : Tag_Type'Class := P;
begin
DDTag_Type(Operand) := DDTag_Type_Value;
Report.Failed ("Constraint_Error not raised: #03");
exception
when Constraint_Error => null; -- expected exception
when others => Report.Failed ("Unexpected exception: #03");
end CW_Proc;
begin
CW_Proc (Tag_Type_Init);
end;
----------------------------------------------------------------------
declare
procedure CW_Proc (P : Tag_Type'Class) is
Operand : Tag_Type'Class := P;
begin
Tag_Type(Operand) := Tag_Type_Value;
if Operand not in DTag_Type then
Report.Failed ("Operand has wrong tag: #04");
elsif (Operand /= Tag_Type'Class (DTag_Type_Res))
then -- Check to make
Report.Failed ("Operand has wrong value: #04"); -- sure that C2 was
end if; -- not modified.
exception
when Constraint_Error =>
Report.Failed ("Constraint_Error raised: #04");
when others =>
Report.Failed ("Unexpected exception: #04");
end CW_Proc;
begin
CW_Proc (DTag_Type_Init);
end;
----------------------------------------------------------------------
declare
procedure CW_Proc (P : Tag_Type'Class) is
Operand : Tag_Type'Class := P;
begin
Tag_Type(Operand) := Tag_Type_Value;
if Operand not in DDTag_Type then
Report.Failed ("Operand has wrong tag: #05");
elsif (Operand /= Tag_Type'Class (DDTag_Type_Res))
then -- Check to make
Report.Failed ("Operand has wrong value: #05"); -- sure that C2, C3
end if; -- were not changed.
exception
when Constraint_Error =>
Report.Failed ("Constraint_Error raised: #05");
when others =>
Report.Failed ("Unexpected exception: #05");
end CW_Proc;
begin
CW_Proc (DDTag_Type_Init);
end;
Report.Result;
end C460005;
|
