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-- C3A0008.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 subprogram references may be passed as parameters using

--      access-to-subprogram types. Check that the passed subprograms may

--      be invoked from within the called subprogram.

--

-- TEST DESCRIPTION:

--      Declare an access to function type in a package specification.

--      Declare three different trig functions that can be referred to by

--      the access to function type.

--

--      In the main program, call each function indirectly by passing the

--      access to subprogram value as parameter.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--

--!

package Integrate_Lookup is

  TC_Log_Call  : Boolean := False;

  TC_Cos_Call  : Boolean := False;

  TC_Sine_Call : Boolean := False;

  -- Type accesses to functions Log, Sine, or Cos

  type Integrand_Ptr is access function

     (Angle : Float) return Float;

  function Log  (Angle : in Float) return Float;

  function Sine (Angle : in Float) return Float;

  function Cos  (Angle : in Float) return Float;

  function Integrate  (Func : Integrand_Ptr; From, To: Float)

    return Float;

end Integrate_Lookup;

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

package body Integrate_Lookup is

  function Log (Angle : in Float) return Float is

  begin

     TC_Log_Call := True;

     return 0.1;

  end Log;

  function Sine (Angle : in Float) return Float is

  begin

     TC_Sine_Call := True;

     return 0.0;

  end Sine;

  function Cos  (Angle : in Float) return Float is

  begin

     TC_Cos_Call := True;

     return 1.0;

  end Cos;

  function Integrate (Func : Integrand_Ptr; From, To: Float)

    return Float is

     Theta : Float;

  begin

     -- calls the actual subprogram passed as parameter

     Theta := Func (From) + Func (To);

     return Theta;

  end Integrate;

end Integrate_Lookup;

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

with Report;

with Integrate_Lookup;

procedure C3A0008 is

  Area : Float := 0.0;

begin

  Report.Test ("C3A0008", "Check that subprogram references may be passed "

                        & "as parameters using access-to-subprogram types. "

                       & "Check that the passed subprograms may be invoked "

                        & "from within the called subprogram");

  Area := Integrate_Lookup.Integrate

            (Integrate_Lookup.Log'Access, 1.0, 2.0);

  If not Integrate_Lookup.TC_Log_Call or Area /= 0.2 then

     Report.Failed ("Incorrect Log result");

  end if;

  Area := Integrate_Lookup.Integrate

            (Integrate_Lookup.Sine'Access, 1.0, 2.0);

  If not Integrate_Lookup.TC_Sine_Call or Area /= 0.0 then

     Report.Failed ("Incorrect Sine result");

  end if;

  Area := Integrate_Lookup.Integrate

            (Integrate_Lookup.Cos'Access, 1.0, 2.0);

  If not Integrate_Lookup.TC_Cos_Call or Area /= 2.0 then

     Report.Failed ("Incorrect Cos result");

  end if;

  Report.Result;

end C3A0008;