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-- CA11014.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 instantiation of a child package of a generic package

--      can use its parent's declarations and operations, including a formal

--      package of the parent.

--

-- TEST DESCRIPTION:

--      Declare a list abstraction in a generic package which manages lists of

--      elements of any discrete type. Declare a generic package which

--      operates on lists of elements of integer types.  Declare a generic

--      child of this package which defines additional list operations.

--      Use the formal discrete type as the generic formal actual part for the

--      parent formal package.

--

--      Declare an instance of parent, then declare an instance of the child

--      which is itself a child the parent's instance. In the main program,

--      check that the operations in both instances perform as expected.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      15 Nov 95   SAIC    Update and repair for ACVC 2.0.1

--      07 Sep 96   SAIC    Change formal param E to be out only.

--      19 Oct 96   SAIC    ACVC 2.1: Added pragma Elaborate to context

--                          clauses of CA11014_0, CA11014_1, and CA11014_5.

--      27 Feb 97   PWB.CTA Added elaboration pragma at package CA11014_4

--!

-- Actual package for the parent's formal.

generic

   type Element_Type is (<>);  -- List elems may be of any discrete types.

package CA11014_0 is

   type Node_Type;

   type Node_Pointer is access Node_Type;

   type Node_Type is record

      Item : Element_Type;

      Next : Node_Pointer := null;

   end record;

   type List_Type is record

      First   : Node_Pointer := null;

      Current : Node_Pointer := null;

      Last    : Node_Pointer := null;

   end record;

   -- Return true if current element is last in the list.

   function End_Of_List (L : List_Type) return boolean;

   -- Set "current" pointer to first list element.

   procedure Reset (L : in out List_Type);

end CA11014_0;

     --==================================================================--

package body CA11014_0 is

   function End_Of_List (L : List_Type) return boolean is

   begin

      return (L.Current = null);

   end End_Of_List;

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

   procedure Reset (L : in out List_Type) is

   begin

      L.Current := L.First;                 -- Set "current" pointer to first

   end Reset;                               -- list element.

end CA11014_0;

     --==================================================================--

with CA11014_0;            -- Generic list abstraction.

pragma Elaborate (CA11014_0);

generic

   -- Import the list abstraction defined in CA11014_0.

   with package List_Mgr is new CA11014_0 (<>);

package CA11014_1 is

   -- Write to current element and advance "current" pointer.

   procedure Write_Element (L : in out List_Mgr.List_Type;

                            E : in     List_Mgr.Element_Type);

   -- Read from current element and advance "current" pointer.

   procedure Read_Element (L : in out List_Mgr.List_Type;

                           E :    out List_Mgr.Element_Type);

   -- Add element to end of list.

   procedure Add_Element (L : in out List_Mgr.List_Type;

                          E : in     List_Mgr.Element_Type);

end CA11014_1;

     --==================================================================--

package body CA11014_1 is

   procedure Write_Element (L : in out List_Mgr.List_Type;

                            E : in     List_Mgr.Element_Type) is

   begin

      L.Current.Item := E;               -- Write to current element.

      L.Current      := L.Current.Next;  -- Advance "current" pointer.

   end Write_Element;

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

   procedure Read_Element (L : in out List_Mgr.List_Type;

                           E :    out List_Mgr.Element_Type) is

   begin

      E         := L.Current.Item;       -- Retrieve current element.

      L.Current := L.Current.Next;       -- Advance "current" pointer.

   end Read_Element;

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

   procedure Add_Element (L : in out List_Mgr.List_Type;

                          E : in     List_Mgr.Element_Type) is

      New_Node : List_Mgr.Node_Pointer := new List_Mgr.Node_Type'(E, null);

       use type List_Mgr.Node_Pointer;

   begin

      if L.First = null then                -- No elements in list, so add new

         L.First := New_Node;               -- element at beginning of list.

      else

         L.Last.Next := New_Node;           -- Add new element at end of list.

      end if;

      L.Last := New_Node;                   -- Set last-in-list pointer.

   end Add_Element;

end CA11014_1;

     --==================================================================--

-- Generic child of list operation.  This child adds a layer of

-- functionality to the parent generic.

generic

package CA11014_1.CA11014_2 is

   procedure Write_First_To_List (L : in out List_Mgr.List_Type);

   -- ... Various other operations used by the application.

end CA11014_1.CA11014_2;

     --==================================================================--

package body CA11014_1.CA11014_2 is

   procedure Write_First_To_List (L : in out List_Mgr.List_Type) is

   begin

      List_Mgr.Reset (L);    -- Parent's formal package.

      while not List_Mgr.End_Of_List (L) loop     -- Parent's formal package.

         Write_Element (L, List_Mgr.Element_Type'First);

                                                  -- Parent's operation,

      end loop;                                   -- parent's formal.

   end Write_First_To_List;

end CA11014_1.CA11014_2;

     --==================================================================--

package CA11014_3 is

   type Points is range 0 .. 100;

   -- ... Various other types used by the application.

end CA11014_3;

-- No body for CA11014_3;

     --==================================================================--

-- Declare instances of the generic list packages for the discrete type.

-- The instance of the child must itself be declared as a child of the

-- instance of the parent.

with CA11014_0;               -- Generic list abstraction.

with CA11014_3;               -- Package containing discrete type declaration.

pragma Elaborate (CA11014_0);

package CA11014_4 is new CA11014_0 (CA11014_3.Points);  -- Points list.

with CA11014_4;               -- Points list.

with CA11014_1;               -- Generic list operation.

pragma Elaborate (CA11014_1);

package CA11014_5 is new CA11014_1 (CA11014_4);         -- Scores list.

with CA11014_1.CA11014_2;     -- Additional generic list operation,

with CA11014_5;

pragma Elaborate (CA11014_5);

package CA11014_5.CA11014_6 is new CA11014_5.CA11014_2;

                                                   -- Points list operation.

     --==================================================================--

with CA11014_1.CA11014_2;      -- Additional generic list operation,

                               -- implicitly with list operation.

with CA11014_3;                -- Package containing discrete type declaration.

with CA11014_4;                -- Points list.

with CA11014_5.CA11014_6;      -- Points list operation.

with Report;

procedure CA11014 is

   package Lists_Of_Scores renames CA11014_4;

   package Score_Ops renames CA11014_5;

   package Point_Ops renames CA11014_5.CA11014_6;

   Scores : Lists_Of_Scores.List_Type;                -- List of points.

   type TC_Score_Array is array (1 .. 3) of CA11014_3.Points;

   TC_Initial_Values : constant TC_Score_Array := (10, 21, 49);

   TC_Final_Values   : constant TC_Score_Array := (0, 0, 0);

   TC_Initial_Values_Are_Correct : boolean := false;

   TC_Final_Values_Are_Correct   : boolean := false;

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

   -- Initial list contains 3 scores with the values 10, 21, and 49.

   procedure TC_Initialize_List (L : in out Lists_of_Scores.List_Type) is

   begin

      for I in TC_Score_Array'range loop

         Score_Ops.Add_Element (L, TC_Initial_Values(I));

                   -- Operation from generic parent.

      end loop;

   end TC_Initialize_List;

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

   -- Verify that all scores have been set to zero.

   procedure TC_Verify_List (L        : in out Lists_of_Scores.List_Type;

                             Expected : in     TC_Score_Array;

                             OK       :    out boolean) is

      Actual : TC_Score_Array;

   begin

      Lists_of_Scores.Reset (L);       -- Operation from parent's formal.

      for I in TC_Score_Array'range loop

         Score_Ops.Read_Element (L, Actual(I));

                   -- Operation from generic parent.

      end loop;

      OK := (Actual = Expected);

   end TC_Verify_List;

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

begin -- CA11014

   Report.Test ("CA11014", "Check that an instantiation of a child package " &

                           "of a generic package can use its parent's "      &

                           "declarations and operations, including a "       &

                           "formal package of the parent");

   TC_Initialize_List (Scores);

   TC_Verify_List (Scores, TC_Initial_Values, TC_Initial_Values_Are_Correct);

   if not TC_Initial_Values_Are_Correct then

      Report.Failed ("List contains incorrect initial values");

   end if;

   Point_Ops.Write_First_To_List (Scores);

                   -- Operation from generic child package.

   TC_Verify_List (Scores, TC_Final_Values, TC_Final_Values_Are_Correct);

   if not TC_Final_Values_Are_Correct then

      Report.Failed ("List contains incorrect final values");

   end if;

   Report.Result;

end CA11014;