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-- C3A0003.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 function in a generic instance can be called using

--      an access-to-subprogram value.

--

-- TEST DESCRIPTION:

--      Declare a numeric type in the visible part of a generic package.

--      Declare an access to function type.  Declare three different sine

--      functions that can be referred to by the access to function type.

--

--      In the main program, instantiate the generic.  Call each function

--      indirectly by dereferencing the access value.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--

--!

generic

   type Real_Num is digits <>;

package C3A0003_0 is

   TC_Call_Tag : Natural := 0;

   -- Type accesses to any sine function

   type Sine_Function_Ptr is access function

      (Angle : in Real_Num) return Real_Num;

   function Sine_Calc_Fast  (Angle : in Real_Num) return Real_Num;

   function Sine_Calc_Acc   (Angle : in Real_Num) return Real_Num;

   function Sine_Calc_Table (Angle : in Real_Num) return Real_Num;

end C3A0003_0;

-----------------------------------------------------------------------------

package body C3A0003_0 is

   function Sine_Calc_Fast (Angle : in Real_Num) return Real_Num is

      Sine_Num : Real_Num := 1.0;

   begin

      TC_Call_Tag := 1;

      return Sine_Num;

   end Sine_Calc_Fast;

   function Sine_Calc_Acc (Angle : in Real_Num) return Real_Num is

      Sine_Num : Real_Num := 0.0;

   begin

      TC_Call_Tag := 2;

      return Sine_Num;

   end Sine_Calc_Acc;

   function Sine_Calc_Table (Angle : in Real_Num) return Real_Num is

      Sine_Num : Real_Num := -1.0;

   begin

      TC_Call_Tag := 3;

      return Sine_Num;

   end Sine_Calc_Table;

end C3A0003_0;

-----------------------------------------------------------------------------

with Report;

with C3A0003_0;

procedure C3A0003 is

   type Real is digits 5;

   Subtype Trig_Float is Real range -1.0 .. 1.0;

   package Trig is new C3A0003_0 (Real_Num => Trig_Float);

   Sine_Access : Trig.Sine_Function_Ptr;

   X, Theta    : Trig_Float := 0.0;

begin

   Report.Test ("C3A0003", "Check that a function in a generic instance can "

                         & "be called using an access-to-subprogram value");

   Sine_Access := Trig.Sine_Calc_Fast'Access;

   -- Invoking Sine function designated by access value

   X := Sine_Access.all(Theta);

   If Trig.TC_Call_Tag /= 1 then

      Report.Failed ("Incorrect Sine_Calc_Fast result");

   end if;

   Sine_Access := Trig.Sine_Calc_Acc'Access;

   -- Invoking Sine function designated by access value

   X := Sine_Access.all(Theta);

   If Trig.TC_Call_Tag /= 2 then

      Report.Failed ("Incorrect Sine_Calc_Acc result");

   end if;

   Sine_Access := Trig.Sine_Calc_Table'Access;

   -- Invoking Sine function designated by access value

   X := Sine_Access.all(Theta);

   If Trig.TC_Call_Tag /= 3 then

      Report.Failed ("Incorrect Sine_Calc_Table result");

   end if;

   Report.Result;

end C3A0003;