c460004.a

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-- C460004.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 if the operand type of a type conversion is class-wide,
--      Constraint_Error is raised if the tag of the operand does not
--      identify a specific type that is covered by or descended from the
--      target type.
--
-- 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.
--      
--      A specific type is descended from itself and from those types it is
--      directly or indirectly derived from. A specific type is covered by
--      itself and each class-wide type to whose class it belongs.
--      
--      A class-wide type T'Class is descended from T and those types which
--      T is descended from. A class-wide type is covered by each class-wide
--      type to whose class it belongs.
--      
--
-- CHANGE HISTORY:
--      19 Jul 95   SAIC    Initial prerelease version.
--      18 Apr 96   SAIC    ACVC 2.1: Added a check for correct tag.
--
--!
package C460004_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);

   procedure NewProc (X : in DDTag_Type);

   function CWFunc (X : Tag_Type'Class) return Tag_Type'Class;

end C460004_0;


     --==================================================================--

with Report;
package body C460004_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;

   -----------------------------------------
   procedure NewProc (X : in DDTag_Type) is
      Y : DDTag_Type := X;
   begin
      Proc (Y);
   exception
      when others => 
         Report.Failed ("Unexpected exception in NewProc");
   end NewProc;

   -----------------------------------------
   function CWFunc (X : Tag_Type'Class) return Tag_Type'Class is
      Y : Tag_Type'Class := X;
   begin
      Proc (Y);
      return Y;
   end CWFunc;

end C460004_0;


     --==================================================================--


with C460004_0;
use  C460004_0;

with Report;
procedure C460004 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");

begin

   Report.Test ("C460004", "Check that for a view conversion of a "      &
                "class-wide operand, Constraint_Error is raised if the " &
                "tag of the operand does not identify a specific type "  &
                "covered by or descended from the target type");

--
-- View conversion to specific type:
--

   declare
      procedure CW_Proc (P : Tag_Type'Class) is
         Target : Tag_Type := Tag_Type_Init;     
      begin
         Target := Tag_Type(P);                      
         if (Target /= Tag_Type_Value) then
            Report.Failed ("Target 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 (DDTag_Type_Value);
   end;

   ----------------------------------------------------------------------

   declare
      Target : DTag_Type := DTag_Type_Init;           
   begin
      Target := DTag_Type(CWFunc(DDTag_Type_Value));  
      if (Target /= DTag_Type_Value) then
         Report.Failed ("Target has wrong value: #02");
      end if;
   exception
      when Constraint_Error => Report.Failed ("Constraint_Error raised: #02");
      when others           => Report.Failed ("Unexpected exception: #02");
   end;

   ----------------------------------------------------------------------

   declare
      Target : DDTag_Type;
   begin
      Target := DDTag_Type(CWFunc(Tag_Type_Value));
                -- CWFunc returns a Tag_Type; its tag is preserved through 
                -- the view conversion.  Constraint_Error should be raised.

      Report.Failed ("Constraint_Error not raised: #03"); 

   exception
      when Constraint_Error => null;                 -- expected exception
      when others           => Report.Failed ("Unexpected exception: #03");
   end;

   ----------------------------------------------------------------------

   declare
      procedure CW_Proc (P : Tag_Type'Class) is
      begin
         NewProc (DDTag_Type(P));
         Report.Failed ("Constraint_Error not raised: #04"); 
                                                         
      exception
         when Constraint_Error => null;              -- expected exception
         when others           => Report.Failed ("Unexpected exception: #04");
      end CW_Proc;
 
   begin
      CW_Proc (DTag_Type_Value);
   end;

   ----------------------------------------------------------------------

   declare
      procedure CW_Proc (P : Tag_Type'Class) is
         Target : DDTag_Type := DDTag_Type_Init; 
      begin
         Target := DDTag_Type(P);
         if (Target /= DDTag_Type_Value) then
            Report.Failed ("Target has wrong value: #05");
         end if;

      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_Value);
   end;


--
-- View conversion to class-wide type:
--

   declare
      procedure CW_Proc (P : Tag_Type'Class) is
         Operand : Tag_Type'Class := P;
      begin
         Proc( DTag_Type'Class(Operand) );
         Report.Failed ("Constraint_Error not raised: #06");

      exception
         when Constraint_Error => null;              -- expected exception
         when others           => Report.Failed ("Unexpected exception: #06");
      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
         Proc( DDTag_Type'Class(Operand) );
         Report.Failed ("Constraint_Error not raised: #07");

      exception
         when Constraint_Error => null;              -- expected exception
         when others           => Report.Failed ("Unexpected exception: #07");
      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
         Proc( DTag_Type'Class(Operand) );  
         if Operand not in DTag_Type then
            Report.Failed ("Operand has wrong tag: #08");
         elsif (Operand /= Tag_Type'Class (DTag_Type_Value)) then
            Report.Failed ("Operand has wrong value: #08");
         end if;

      exception
         when Constraint_Error => 
            Report.Failed ("Constraint_Error raised: #08");
         when others           => 
            Report.Failed ("Unexpected exception: #08");
      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
         Proc( Tag_Type'Class(Operand) );
         if Operand not in DDTag_Type then
            Report.Failed ("Operand has wrong tag: #09");
         elsif (Operand /= Tag_Type'Class (DDTag_Type_Value)) then
            Report.Failed ("Operand has wrong value: #09");
         end if;

      exception
         when Constraint_Error => 
            Report.Failed ("Constraint_Error raised: #09");
         when others           => 
            Report.Failed ("Unexpected exception: #09");
      end CW_Proc;
 
   begin
      CW_Proc (DDTag_Type_Init);
   end;


   Report.Result;

end C460004;