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1 149 jeremybenn
-- CA11012.A
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--
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--                             Grant of Unlimited Rights
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--
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--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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--     unlimited rights in the software and documentation contained herein.
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--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making
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--     this public release, the Government intends to confer upon all
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--     recipients unlimited rights  equal to those held by the Government.
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--     These rights include rights to use, duplicate, release or disclose the
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--     released technical data and computer software in whole or in part, in
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--     any manner and for any purpose whatsoever, and to have or permit others
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--     to do so.
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--
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--                                    DISCLAIMER
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--
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--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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--     PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- OBJECTIVE:
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--      Check that a child package of a library level instantiation
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--      of a generic can be the instantiation of a child package of
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--      the generic. Check that the child instance can use its parent's
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--      declarations and operations, including a formal type of the parent.
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--
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-- TEST DESCRIPTION:
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--      Declare a generic package which simulates an integer complex
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--      abstraction.  Declare a generic child package of this package
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--      which defines additional complex operations.
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--
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--      Instantiate the first generic package, then instantiate the child
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--      generic package as a child unit of the first instance.  In the main
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--      program, check that the operations in both instances perform as
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--      expected.
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--
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--
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-- CHANGE HISTORY:
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--      06 Dec 94   SAIC    ACVC 2.0
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--      21 Dec 94   SAIC    Corrected visibility errors for literals
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--      27 Feb 97   PWB.CTA Added elaboration pragma at package CA11012_3
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--!
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generic               -- Complex number abstraction.
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   type Int_Type is range <>;
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package CA11012_0 is
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   -- Simulate a generic complex number support package. Complex numbers
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   -- are treated as coordinates in the Cartesian plane.
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   type Complex_Type is private;
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   Zero : constant Complex_Type;                      -- Real number (0,0).
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   function Complex (Real, Imag : Int_Type)           -- Create a complex
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     return Complex_Type;                             -- number.
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   function "-" (Right : Complex_Type)                -- Invert a complex
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     return Complex_Type;                             -- number.
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   function "+" (Left, Right : Complex_Type)          -- Add two complex
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     return Complex_Type;                             -- numbers.
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private
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   type Complex_Type is record
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      Real : Int_Type;
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      Imag : Int_Type;
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   end record;
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   Zero : constant Complex_Type := (Real => 0, Imag => 0);
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end CA11012_0;
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     --==================================================================--
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package body CA11012_0 is
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   function Complex (Real, Imag : Int_Type) return Complex_Type is
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   begin
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      return (Real, Imag);
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   end Complex;
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   ---------------------------------------------------------------
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   function "-" (Right : Complex_Type) return Complex_Type is
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   begin
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      return (-Right.Real, -Right.Imag);
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   end "-";
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   ---------------------------------------------------------------
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   function "+" (Left, Right : Complex_Type) return Complex_Type is
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   begin
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      return ( (Left.Real + Right.Real, Left.Imag + Right.Imag) );
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   end "+";
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end CA11012_0;
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     --==================================================================--
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-- Generic child of complex number package.  Child must be generic since
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-- parent is generic.
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generic               -- Complex additional operations
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package CA11012_0.CA11012_1 is
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   -- More operations on complex number. This child adds a layer of
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   -- functionality to the parent generic.
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   function Real_Part (Complex_No : Complex_Type)
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     return Int_Type;
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   function Imag_Part (Complex_No : Complex_Type)
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     return Int_Type;
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   function "*" (Factor : Int_Type;
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                 C      : Complex_Type) return Complex_Type;
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   function Vector_Magnitude (Complex_No : Complex_Type)
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     return Int_Type;
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end CA11012_0.CA11012_1;
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     --==================================================================--
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package body CA11012_0.CA11012_1 is
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   function Real_Part (Complex_No : Complex_Type) return Int_Type is
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   begin
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      return (Complex_No.Real);
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   end Real_Part;
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   ---------------------------------------------------------------
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   function Imag_Part (Complex_No : Complex_Type) return Int_Type is
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   begin
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      return (Complex_No.Imag);
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   end Imag_Part;
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   ---------------------------------------------------------------
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   function "*" (Factor : Int_Type;
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                 C      : Complex_Type) return Complex_Type is
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      Result : Complex_Type := Zero;   -- Zero is declared in parent,
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                                       -- Complex_Number
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   begin
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      for I in 1 .. abs (Factor) loop
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         Result := Result + C;         -- Complex_Number "+"
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      end loop;
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      if Factor < 0 then
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         Result := - Result;           -- Complex_Number "-"
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      end if;
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      return Result;
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   end "*";
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   ---------------------------------------------------------------
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   function Vector_Magnitude (Complex_No : Complex_Type)
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     return Int_Type is                -- Not a real vector magnitude.
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   begin
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      return (Complex_No.Real + Complex_No.Imag);
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   end Vector_Magnitude;
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end CA11012_0.CA11012_1;
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     --==================================================================--
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package CA11012_2 is
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   subtype My_Integer is integer range -100 .. 100;
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   -- ... Various other types used by the application.
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end CA11012_2;
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-- No body for CA11012_2;
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     --==================================================================--
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-- Declare instances of the generic complex packages for integer type.
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-- The instance of the child must itself be declared as a child of the
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-- instance of the parent.
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with CA11012_0;                        -- Complex number abstraction
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with CA11012_2;                        -- Package containing integer type
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pragma Elaborate (CA11012_0);
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package CA11012_3 is new CA11012_0 (Int_Type => CA11012_2.My_Integer);
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with CA11012_0.CA11012_1;              -- Complex additional operations
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with CA11012_3;
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package CA11012_3.CA11012_4 is new CA11012_3.CA11012_1;
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     --==================================================================--
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with CA11012_2;                -- Package containing integer type
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with CA11012_3.CA11012_4;      -- Complex abstraction + additional operations
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with Report;
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procedure CA11012 is
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   package My_Complex_Pkg renames CA11012_3;
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   package My_Complex_Operation renames CA11012_3.CA11012_4;
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   use My_Complex_Pkg,                                -- All user-defined
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       My_Complex_Operation;                          -- operators directly
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                                                      -- visible.
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   Complex_One, Complex_Two : Complex_Type;
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begin
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   Report.Test ("CA11012", "Check that child instance can use its parent's "  &
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                           "declarations and operations, including a formal " &
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                           "type of the parent");
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   Correct_Range_Test:
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   declare
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      My_Literal  : CA11012_2.My_Integer := -3;
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   begin
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      Complex_One := Complex (-4, 7);          -- Operation from the generic
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                                               -- parent package.
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      Complex_Two := My_Literal * Complex_One; -- Operation from the generic
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                                               -- child package.
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      if Real_Part (Complex_Two) /= 12         -- Operation from the generic
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        or Imag_Part (Complex_Two) /= -21      -- child package.
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          then
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             Report.Failed ("Incorrect results from complex operation");
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      end if;
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   end Correct_Range_Test;
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   ---------------------------------------------------------------
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   Out_Of_Range_Test:
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   declare
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      My_Vector : CA11012_2.My_Integer;
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   begin
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      Complex_One := Complex (70, 70);         -- Operation from the generic
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                                               -- parent package.
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      My_Vector := Vector_Magnitude (Complex_One);
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                     -- Operation from the generic child package.
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      Report.Failed ("Exception not raised in child package");
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   exception
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      when Constraint_Error =>
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        Report.Comment ("Exception is raised as expected");
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      when others           =>
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        Report.Failed ("Others exception is raised");
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   end Out_Of_Range_Test;
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   Report.Result;
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end CA11012;

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