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-- C3A0011.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 an access-to-subprogram object whose type is declared in a

--      parent package, may be used to invoke subprograms in a child package.

--      Check that such access objects may be stored in a data structure and

--      that subprograms may be called by walking the data structure.

--

-- TEST DESCRIPTION:

--      In the package, declare an access to procedure type.  Declare an

--      array of the access type.  Declare three different procedures that

--      can be referred to by the access to procedure type.

--

--      In the visible child package, declare two procedures that can be

--      referred to by the access to procedure type of the parent.  Build

--      the array by calling each procedure indirectly through the access

--      value.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      16 Dec 94   SAIC    Improved visibility of "/=" in main body

--

--!

package C3A0011_0 is -- Interpreter

   type Compass_Point is mod 360;

   function Heading return Compass_Point;

   -- Type accesses to any procedure

   type Action_Ptr is access procedure;

   -- Array of access to procedure

   type Action_Array is array (Natural range <>) of Action_Ptr;

   procedure Rotate_Left;

   procedure Rotate_Right;

   procedure Center;

private

   The_Heading : Compass_Point := Compass_Point'First;

end C3A0011_0;

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

package body C3A0011_0 is

   function Heading return Compass_Point is

   begin

     return The_Heading;

   end Heading;

   procedure Rotate_Left is

   begin

      The_Heading := The_Heading - 90;

   end Rotate_Left;

   procedure Rotate_Right is

   begin

      The_Heading := The_Heading + 90;

   end Rotate_Right;

   procedure Center is

   begin

      The_Heading := 0;

   end Center;

end C3A0011_0;

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

package C3A0011_0.Action is

   procedure Rotate_Front;

   procedure Rotate_Back;

end C3A0011_0.Action;

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

package body C3A0011_0.Action is

   procedure Rotate_Front is

   begin

      The_Heading := The_Heading + 5;

   end Rotate_Front;

   procedure Rotate_Back is

   begin

      The_Heading := The_Heading - 5;

   end Rotate_Back;

end C3A0011_0.Action;

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

with C3A0011_0.Action;

with Report;

procedure C3A0011 is

   Total_Actions   : constant := 6;

   Action_Sequence : C3A0011_0.Action_Array (1 .. Total_Actions);

   type Result_Array is array (Natural range <>) of C3A0011_0.Compass_Point;

   Action_Results  : Result_Array(1 .. Total_Actions);

   package IA renames C3A0011_0.Action;

begin

   Report.Test ("C3A0011", "Check that an access-to-subprogram object whose "

                         & "type is declared in a parent package, may be "

                         & "used to invoke subprograms in a child package. "

                         & "Check that such access objects may be stored in "

                         & "a data structure and that subprograms may be "

                         & "called by walking the data structure");

   -- Build the action sequence

   Action_Sequence := (C3A0011_0.Rotate_Left'Access,

                       C3A0011_0.Center'Access,

                       C3A0011_0.Rotate_Right'Access,

                       IA.Rotate_Front'Access,

                       C3A0011_0.Center'Access,

                       IA.Rotate_Back'Access);

   -- Build the expected result

   Action_Results := ( 270, 0, 90, 95, 0, 355 );

   -- Assign actions by invoking subprogram designated by access value

   for I in Action_Sequence'Range loop

      Action_Sequence(I).all;

      if C3A0011_0."/="( C3A0011_0.Heading, Action_Results(I) ) then

        Report.Failed ("Expecting "

                       & C3A0011_0.Compass_Point'Image(Action_Results(I))

                       & " Got"

                       & C3A0011_0.Compass_Point'Image(C3A0011_0.Heading));

      end if;

   end loop;

   Report.Result;

end C3A0011;