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-- CA11021.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 body of the generic parent package can depend on one of
-- its own private generic children.
--
-- TEST DESCRIPTION:
-- A scenario is created that demonstrates the potential of adding a
-- public generic child during code maintenance without distubing a large
-- subsystem. After child is added to the subsystem, a maintainer
-- decides to take advantage of the new functionality and rewrites
-- the parent's body.
--
-- Declare a generic package which declares high level operations for a
-- complex number abstraction. Declare a private generic child package
-- of this package which defines low level complex operations. In the
-- parent body, instantiate the private child. Use the low level
-- operation to complete the high level operation.
--
-- In the main program, instantiate the parent generic package.
-- Check that the operations in both packages perform as expected.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
generic -- Complex number abstraction.
type Int_Type is range <>;
package CA11021_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 Real_Part (Complex_No : Complex_Type)
return Int_Type;
function Imag_Part (Complex_No : Complex_Type)
return Int_Type;
function Complex (Real, Imag : Int_Type)
return Complex_Type;
-- High level operation for complex number.
function "*" (Factor : Int_Type;
C : Complex_Type) return Complex_Type;
-- ... and other complicated ones.
private
type Complex_Type is record
Real : Int_Type;
Imag : Int_Type;
end record;
Zero : constant Complex_Type := (Real => 0, Imag => 0);
end CA11021_0;
--==================================================================--
-- Private generic child of Complex_Number.
private
generic
-- No parameter.
package CA11021_0.CA11021_1 is
-- ... Other declarations.
-- Low level operation on complex number.
function "+" (Left, Right : Complex_Type)
return Complex_Type;
function "-" (Right : Complex_Type)
return Complex_Type;
-- ... Various other operations in real application.
end CA11021_0.CA11021_1;
--==================================================================--
package body CA11021_0.CA11021_1 is
function "+" (Left, Right : Complex_Type)
return Complex_Type is
begin
return ( (Left.Real + Right.Real, Left.Imag + Right.Imag) );
end "+";
--------------------------------------------------
function "-" (Right : Complex_Type) return Complex_Type is
begin
return (-Right.Real, -Right.Imag);
end "-";
end CA11021_0.CA11021_1;
--==================================================================--
with CA11021_0.CA11021_1; -- Private generic child package.
package body CA11021_0 is
-----------------------------------------------------
-- Parent's body depends on private generic child. --
-----------------------------------------------------
-- Instantiate the private child.
package Complex_Ops is new CA11021_1;
use Complex_Ops; -- All user-defined operators
-- directly visible.
--------------------------------------------------
function "*" (Factor : Int_Type;
C : Complex_Type) return Complex_Type is
Result : Complex_Type := Zero;
begin
for I in 1 .. abs (Factor) loop
Result := Result + C; -- Private generic child "+".
end loop;
if Factor < 0 then
Result := - Result; -- Private generic child "-".
end if;
return Result;
end "*";
--------------------------------------------------
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 Complex (Real, Imag : Int_Type) return Complex_Type is
begin
return (Real, Imag);
end Complex;
end CA11021_0;
--==================================================================--
with CA11021_0; -- Complex number abstraction.
with Report;
procedure CA11021 is
type My_Integer is range -100 .. 100;
--------------------------------------------------
-- Declare instance of the generic complex package for one particular
-- integer type.
package My_Complex_Pkg is new
CA11021_0 (Int_Type => My_Integer);
use My_Complex_Pkg; -- All user-defined operators
-- directly visible.
--------------------------------------------------
Complex_One, Complex_Two : Complex_Type;
My_Literal : My_Integer := -3;
begin
Report.Test ("CA11021", "Check that body of the generic parent package " &
"can depend on its private generic child");
Complex_One := Complex (11, 6);
Complex_Two := 5 * Complex_One;
if Real_Part (Complex_Two) /= 55
and Imag_Part (Complex_Two) /= 30
then
Report.Failed ("Incorrect results from complex operation");
end if;
Complex_One := Complex (-4, 7);
Complex_Two := My_Literal * Complex_One;
if Real_Part (Complex_Two) /= 12
and Imag_Part (Complex_Two) /= -21
then
Report.Failed ("Incorrect results from complex operation");
end if;
Report.Result;
end CA11021;
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