-- CC51003.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 ancestor type of a formal derived type is a composite
--      type that is not an array type, the formal type inherits components,
--      including discriminants, from the ancestor type.
--
--      Check for the case where the ancestor type is a record type, and the
--      formal derived type is declared in a generic subprogram.
--
-- TEST DESCRIPTION:
--      Define a discriminated record type in a package. Declare a
--      library-level generic subprogram with a formal derived type using the
--      record type as ancestor. Give the generic subprogram an in out
--      parameter of the formal derived type. Inside the generic, use the
--      discriminant component and modify the remaining components of the
--      record parameter. In the main program, declare record objects with two
--      different discriminant values. Derive an indefinite type from the
--      record type with a new discriminant part. Instantiate the generic
--      subprogram for the root record subtype and the derived subtype. Call
--      the root subtype instance with actual parameters having the two
--      discriminant values. Also call the derived subtype instance with
--      an appropriate actual.
--
--
-- CHANGE HISTORY:
--      06 Dec 94   SAIC    ACVC 2.0
--      03 Jan 95   SAIC    Removed unknown discriminant part from formal
--                          derived type.
--      05 Nov 95   SAIC    ACVC 2.0.1 fixes: Removed constrained subtype
--                          instantiation and associated declarations.
--                          Modified commentary.
--
--!


-- Simulate a fragment of a matrix manipulation application.

package CC51003_0 is  -- Matrix types.

   type Matrix is array (Natural range <>, Natural range <>) of Integer;

   type Square (Side : Natural) is record
      Mat : Matrix (1 .. Side, 1 .. Side);
   end record;

   type Double_Square (Number : Natural) is record
      Left  : Square (Number);
      Right : Square (Number);
   end record;

end CC51003_0;


-- No body for CC51003_0;


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


with CC51003_0;  -- Matrix types.
generic          -- Generic double-matrix "clear" operation.
   type Dbl_Square is new CC51003_0.Double_Square;            -- Indefinite
procedure CC51003_1 (Dbl : in out Dbl_Square);                -- formal.


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


procedure CC51003_1 (Dbl : in out Dbl_Square) is
begin
   for I in 1 .. Dbl.Number loop     -- Discriminants inherited from ancestor
      for J in 1 .. Dbl.Number loop  -- type (should work even for derived type
                                     -- declaring new discriminant part).
         Dbl.Left.Mat (I, J)  := 0;  -- Other components inherited from
         Dbl.Right.Mat (I, J) := 0;  -- ancestor type.

      end loop;
   end loop;
end CC51003_1;


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


with CC51003_0;  -- Matrix types.
with CC51003_1;  -- Generic double-matrix "clear" operation.

with Report;
procedure CC51003 is

   use CC51003_0;  -- "/=" operator directly visible for Double_Square.

   -- Matrices of root type:

   Mat_2x2      : Square(Side => 2)           := (Side => 2,
                                                  Mat  => ( (1, 2), (3, 4) ));
   Dbl_Mat_2x2  : Double_Square(Number => 2)  := (2, Mat_2x2, Mat_2x2);


   Zero_2x2     : constant Square(2)        := (2, Mat => ( (0, 0), (0, 0) ));
   Expected_2x2 : constant Double_Square(2) := (Number => 2,
                                                others => Zero_2x2);


   Mat_3x3      : Square(Side => 3) := (Side => 3,
                                        Mat  => (1      => (1, 4, 9),
                                                 others => (1      => 5,
                                                            others => 7)));
   Dbl_Mat_3x3  : Double_Square(3)  := (Number => 3, others => Mat_3x3);


   Zero_3x3     : constant Square(3) := (3, Mat => (others => (0,0,0)));
   Expected_3x3 : constant Double_Square(Number => 3) :=
                                        (3, Zero_3x3, Zero_3x3);


   -- Derived type with new discriminant part (which constrains parent):

   type New_Dbl_Sq (Num : Natural) is new Double_Square(Num);

   New_Dbl_2x2      : New_Dbl_Sq (Num => 2) := (2, Mat_2x2, Mat_2x2);
   Expected_New_2x2 : constant New_Dbl_Sq   := (Num => 2, others => Zero_2x2);


   -- Instantiations:

   procedure Clr_Dbl is new CC51003_1 (Double_Square);
   procedure Clr_New_Dbl is new CC51003_1 (New_Dbl_Sq);


begin
   Report.Test ("CC51003", "Check that a formal derived record type " &
                           "inherits components, including discriminants, " &
                           "from its ancestor type");

   -- Simulate use of matrix manipulation operations.

   Clr_Dbl (Dbl_Mat_2x2);

   if (Dbl_Mat_2x2 /= Expected_2x2) then
      Report.Failed ("Wrong result for root type (2x2 matrix)");
   end if;


   Clr_Dbl (Dbl_Mat_3x3);

   if (Dbl_Mat_3x3 /= Expected_3x3) then
      Report.Failed ("Wrong result for root type (3x3 matrix)");
   end if;


   Clr_New_Dbl (New_Dbl_2x2);

   if (New_Dbl_2x2 /= Expected_New_2x2) then
      Report.Failed ("Wrong result for derived type (2x2 matrix)");
   end if;


   Report.Result;

end CC51003;