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1 294 jeremybenn
-- C3A0001.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 access to subprogram type can be used to select and
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--      invoke functions with appropriate arguments dynamically.
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--
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-- TEST DESCRIPTION:
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--      Declare an access to function type in a package specification.
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--      Declare three different sine functions that can be referred to by
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--      the access to function type.
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--
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--      In the main program, call each function indirectly by dereferencing
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--      the access value.
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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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package C3A0001_0 is
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   TC_Call_Tag : Natural := 0;
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   -- Type accesses to any sine function
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   type Sine_Function_Ptr is access function
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      (Angle : in Float) return Float;
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-- Three 'Sine' functions that model an application situation in which
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-- one function might be chosen when speed is important, another (using
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-- a different algorithm) might be chosen when accuracy is important,
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-- and so on.
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   function Sine_Calc_Fast  (Angle : in Float) return Float;
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   function Sine_Calc_Acc   (Angle : in Float) return Float;
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   function Sine_Calc_Table (Angle : in Float) return Float;
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end C3A0001_0;
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-----------------------------------------------------------------------------
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package body C3A0001_0 is
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   function Sine_Calc_Fast (Angle : in Float) return Float is
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   begin
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      TC_Call_Tag := 1;
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      return 1.0;
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   end Sine_Calc_Fast;
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   function Sine_Calc_Acc (Angle : in Float) return Float is
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   begin
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      TC_Call_Tag := 2;
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      return 0.0;
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   end Sine_Calc_Acc;
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   function Sine_Calc_Table (Angle : in Float) return Float is
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   begin
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      TC_Call_Tag := 3;
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      return -1.0;
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   end Sine_Calc_Table;
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end C3A0001_0;
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-----------------------------------------------------------------------------
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with Report;
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with C3A0001_0;
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procedure C3A0001 is
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   Sine_Access : C3A0001_0.Sine_Function_Ptr;
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   X, Theta    : Float := 0.0;
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begin
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   Report.Test ("C3A0001", "Check that access to subprogram can be " &
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                "used to select and invoke an operation with " &
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                "appropriate arguments dynamically");
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   Sine_Access := C3A0001_0.Sine_Calc_Fast'Access;
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   -- Invoking Sine function designated by access value
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   X := Sine_Access(Theta);
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   If C3A0001_0.TC_Call_Tag /= 1 then
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      Report.Failed ("Incorrect Sine_Calc_Fast result");
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   end if;
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   Sine_Access := C3A0001_0.Sine_Calc_Acc'Access;
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   -- Invoking Sine function designated by access value
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   X := Sine_Access(Theta);
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   If C3A0001_0.TC_Call_Tag /= 2 then
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      Report.Failed ("Incorrect Sine_Calc_Acc result");
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   end if;
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   Sine_Access := C3A0001_0.Sine_Calc_Table'Access;
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   -- Invoking Sine function designated by access value
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   X := Sine_Access(Theta);
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   If C3A0001_0.TC_Call_Tag /= 3 then
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      Report.Failed ("Incorrect Sine_Calc_Table result");
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   end if;
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   Report.Result;
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end C3A0001;

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