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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;