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1 149 jeremybenn
-- CC70A02.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 the visible part of a generic formal package includes the
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--      first list of basic declarative items of the package specification.
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--      Check for a generic subprogram which declares a formal package with
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--      (<>) as its actual part.
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--
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-- TEST DESCRIPTION:
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--      The "first list of basic declarative items" of a package specification
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--      is the visible part of the package. Thus, the declarations in the
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--      visible part of the actual instance corresponding to a formal
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--      package are available in the generic which declares the formal package.
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--
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--      Declare a generic package which simulates a complex integer abstraction
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--      (foundation code).
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--
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--      Declare a second generic package which defines a "signature" for
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--      mathematical groups. Declare a generic function within a package
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--      which utilizes the second generic package as a generic formal package
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--      (with a (<>) actual_part).
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--
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--      In the main program, instantiate the first generic package, then
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--      instantiate the second generic package with objects, types, and
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--      operations declared in the first instance.
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--
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--      Instantiate the generic function and pass the second instance
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--      to it as a generic actual parameter. Check that the instance of the
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--      generic function performs as 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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--
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--!
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generic               -- Mathematical group signature.
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   type Group_Type is private;
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   Identity : in Group_Type;
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   with function Operation (Left, Right : Group_Type) return Group_Type;
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   with function Inverse   (Right : Group_Type)       return Group_Type;
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package CC70A02_0 is end;
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-- No body for CC70A02_0.
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     --==================================================================--
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with CC70A02_0;       -- Mathematical group signature.
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package CC70A02_1 is  -- Mathematical group operations.
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   --                                  --
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   -- Generic formal package used here --
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   --                                  --
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   generic            -- Powers for mathematical groups.
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      with package Group is new CC70A02_0 (<>);
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   function Power (Left : Group.Group_Type; Right : Integer)
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     return Group.Group_Type;
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end CC70A02_1;
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     --==================================================================--
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package body CC70A02_1 is  -- Mathematical group operations.
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   function Power (Left : Group.Group_Type; Right : Integer)
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     return Group.Group_Type is
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      Result : Group.Group_Type := Group.Identity;
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   begin
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      for I in 1 .. abs(Right) loop                 -- Repeat group operations
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         Result := Group.Operation (Result, Left);  -- the specified number of
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      end loop;                                     -- times.
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      if Right < 0 then                             -- If specified power is
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         return Group.Inverse (Result);             -- negative, return the
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      else                                          -- inverse of the result.
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         return Result;                             -- If it is zero, return
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      end if;                                       -- the identity.
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   end Power;
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end CC70A02_1;
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     --==================================================================--
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with Report;
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with FC70A00;    -- Complex integer abstraction.
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with CC70A02_0;  -- Mathematical group signature.
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with CC70A02_1;  -- Mathematical group operations.
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procedure CC70A02 is
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   -- Declare an instance of complex integers:
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   type My_Integer is range -100 .. 100;
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   package Complex_Integers is new FC70A00 (My_Integer);
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   -- Define an addition group for complex integers:
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   package Complex_Addition_Group is new CC70A02_0
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     (Group_Type => Complex_Integers.Complex_Type,  -- For complex integers...
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      Identity   => Complex_Integers.Zero,          -- Additive identity.
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      Operation  => Complex_Integers."+",           -- Additive operation.
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      Inverse    => Complex_Integers."-");          -- Additive inverse.
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   function Complex_Multiplication is new           -- Multiplication of a
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     CC70A02_1.Power(Complex_Addition_Group);       -- complex integer by a
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                                                    -- constant.
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   -- Define a multiplication group for complex integers:
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   package Complex_Multiplication_Group is new CC70A02_0
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     (Group_Type => Complex_Integers.Complex_Type,  -- For complex integers...
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      Identity   => Complex_Integers.One,           -- Multiplicative identity.
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      Operation  => Complex_Integers."*",           -- Multiplicative oper.
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      Inverse    => Complex_Integers.Reciprocal);   -- Multiplicative inverse.
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   function Complex_Exponentiation is new           -- Exponentiation of a
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     CC70A02_1.Power(Complex_Multiplication_Group); -- complex integer by a
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                                                    -- constant.
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   use Complex_Integers;
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begin  -- Main program.
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   Report.Test ("CC70A02", "Check that the visible part of a generic " &
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                "formal package includes the first list of basic " &
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                "declarative items of the package specification. Check " &
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                "for a generic subprogram where formal package has (<>) " &
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                "actual part");
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   declare
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      Mult_Operand         : constant Complex_Type := Complex ( -4,  9);
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      Exp_Operand          : constant Complex_Type := Complex (  0, -7);
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      Expected_Mult_Result : constant Complex_Type := Complex ( 28, -63);
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      Expected_Exp_Result  : constant Complex_Type := Complex (-49,   0);
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   begin
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      if Complex_Multiplication (Mult_Operand, -7) /= Expected_Mult_Result then
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         Report.Failed ("Incorrect results from complex multiplication");
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      end if;
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      if Complex_Exponentiation (Exp_Operand, 2) /= Expected_Exp_Result then
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         Report.Failed ("Incorrect results from complex exponentiation");
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      end if;
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   end;
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   Report.Result;
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end CC70A02;

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