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-- CA11012.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 a child package of a library level instantiation
-- of a generic can be the instantiation of a child package of
-- the generic. Check that the child instance can use its parent's
-- declarations and operations, including a formal type of the parent.
--
-- TEST DESCRIPTION:
-- Declare a generic package which simulates an integer complex
-- abstraction. Declare a generic child package of this package
-- which defines additional complex operations.
--
-- Instantiate the first generic package, then instantiate the child
-- generic package as a child unit of the first instance. In the main
-- program, check that the operations in both instances perform as
-- expected.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
-- 21 Dec 94 SAIC Corrected visibility errors for literals
-- 27 Feb 97 PWB.CTA Added elaboration pragma at package CA11012_3
--!
generic -- Complex number abstraction.
type Int_Type is range <>;
package CA11012_0 is
-- Simulate a generic complex number support package. Complex numbers
-- are treated as coordinates in the Cartesian plane.
type Complex_Type is private;
Zero : constant Complex_Type; -- Real number (0,0).
function Complex (Real, Imag : Int_Type) -- Create a complex
return Complex_Type; -- number.
function "-" (Right : Complex_Type) -- Invert a complex
return Complex_Type; -- number.
function "+" (Left, Right : Complex_Type) -- Add two complex
return Complex_Type; -- numbers.
private
type Complex_Type is record
Real : Int_Type;
Imag : Int_Type;
end record;
Zero : constant Complex_Type := (Real => 0, Imag => 0);
end CA11012_0;
--==================================================================--
package body CA11012_0 is
function Complex (Real, Imag : Int_Type) return Complex_Type is
begin
return (Real, Imag);
end Complex;
---------------------------------------------------------------
function "-" (Right : Complex_Type) return Complex_Type is
begin
return (-Right.Real, -Right.Imag);
end "-";
---------------------------------------------------------------
function "+" (Left, Right : Complex_Type) return Complex_Type is
begin
return ( (Left.Real + Right.Real, Left.Imag + Right.Imag) );
end "+";
end CA11012_0;
--==================================================================--
-- Generic child of complex number package. Child must be generic since
-- parent is generic.
generic -- Complex additional operations
package CA11012_0.CA11012_1 is
-- More operations on complex number. This child adds a layer of
-- functionality to the parent generic.
function Real_Part (Complex_No : Complex_Type)
return Int_Type;
function Imag_Part (Complex_No : Complex_Type)
return Int_Type;
function "*" (Factor : Int_Type;
C : Complex_Type) return Complex_Type;
function Vector_Magnitude (Complex_No : Complex_Type)
return Int_Type;
end CA11012_0.CA11012_1;
--==================================================================--
package body CA11012_0.CA11012_1 is
function Real_Part (Complex_No : Complex_Type) return Int_Type is
begin
return (Complex_No.Real);
end Real_Part;
---------------------------------------------------------------
function Imag_Part (Complex_No : Complex_Type) return Int_Type is
begin
return (Complex_No.Imag);
end Imag_Part;
---------------------------------------------------------------
function "*" (Factor : Int_Type;
C : Complex_Type) return Complex_Type is
Result : Complex_Type := Zero; -- Zero is declared in parent,
-- Complex_Number
begin
for I in 1 .. abs (Factor) loop
Result := Result + C; -- Complex_Number "+"
end loop;
if Factor < 0 then
Result := - Result; -- Complex_Number "-"
end if;
return Result;
end "*";
---------------------------------------------------------------
function Vector_Magnitude (Complex_No : Complex_Type)
return Int_Type is -- Not a real vector magnitude.
begin
return (Complex_No.Real + Complex_No.Imag);
end Vector_Magnitude;
end CA11012_0.CA11012_1;
--==================================================================--
package CA11012_2 is
subtype My_Integer is integer range -100 .. 100;
-- ... Various other types used by the application.
end CA11012_2;
-- No body for CA11012_2;
--==================================================================--
-- Declare instances of the generic complex packages for integer type.
-- The instance of the child must itself be declared as a child of the
-- instance of the parent.
with CA11012_0; -- Complex number abstraction
with CA11012_2; -- Package containing integer type
pragma Elaborate (CA11012_0);
package CA11012_3 is new CA11012_0 (Int_Type => CA11012_2.My_Integer);
with CA11012_0.CA11012_1; -- Complex additional operations
with CA11012_3;
package CA11012_3.CA11012_4 is new CA11012_3.CA11012_1;
--==================================================================--
with CA11012_2; -- Package containing integer type
with CA11012_3.CA11012_4; -- Complex abstraction + additional operations
with Report;
procedure CA11012 is
package My_Complex_Pkg renames CA11012_3;
package My_Complex_Operation renames CA11012_3.CA11012_4;
use My_Complex_Pkg, -- All user-defined
My_Complex_Operation; -- operators directly
-- visible.
Complex_One, Complex_Two : Complex_Type;
begin
Report.Test ("CA11012", "Check that child instance can use its parent's " &
"declarations and operations, including a formal " &
"type of the parent");
Correct_Range_Test:
declare
My_Literal : CA11012_2.My_Integer := -3;
begin
Complex_One := Complex (-4, 7); -- Operation from the generic
-- parent package.
Complex_Two := My_Literal * Complex_One; -- Operation from the generic
-- child package.
if Real_Part (Complex_Two) /= 12 -- Operation from the generic
or Imag_Part (Complex_Two) /= -21 -- child package.
then
Report.Failed ("Incorrect results from complex operation");
end if;
end Correct_Range_Test;
---------------------------------------------------------------
Out_Of_Range_Test:
declare
My_Vector : CA11012_2.My_Integer;
begin
Complex_One := Complex (70, 70); -- Operation from the generic
-- parent package.
My_Vector := Vector_Magnitude (Complex_One);
-- Operation from the generic child package.
Report.Failed ("Exception not raised in child package");
exception
when Constraint_Error =>
Report.Comment ("Exception is raised as expected");
when others =>
Report.Failed ("Others exception is raised");
end Out_Of_Range_Test;
Report.Result;
end CA11012;
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