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1 294 jeremybenn
-- CA11014.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 an instantiation of a child package of a generic package
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--      can use its parent's declarations and operations, including a formal
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--      package of the parent.
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--
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-- TEST DESCRIPTION:
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--      Declare a list abstraction in a generic package which manages lists of
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--      elements of any discrete type. Declare a generic package which
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--      operates on lists of elements of integer types.  Declare a generic
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--      child of this package which defines additional list operations.
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--      Use the formal discrete type as the generic formal actual part for the
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--      parent formal package.
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--
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--      Declare an instance of parent, then declare an instance of the child
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--      which is itself a child the parent's instance. In the main program,
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--      check that the operations in both instances perform as expected.
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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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--      15 Nov 95   SAIC    Update and repair for ACVC 2.0.1
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--      07 Sep 96   SAIC    Change formal param E to be out only.
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--      19 Oct 96   SAIC    ACVC 2.1: Added pragma Elaborate to context
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--                          clauses of CA11014_0, CA11014_1, and CA11014_5.
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--      27 Feb 97   PWB.CTA Added elaboration pragma at package CA11014_4
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--!
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-- Actual package for the parent's formal.
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generic
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   type Element_Type is (<>);  -- List elems may be of any discrete types.
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package CA11014_0 is
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   type Node_Type;
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   type Node_Pointer is access Node_Type;
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   type Node_Type is record
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      Item : Element_Type;
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      Next : Node_Pointer := null;
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   end record;
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   type List_Type is record
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      First   : Node_Pointer := null;
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      Current : Node_Pointer := null;
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      Last    : Node_Pointer := null;
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   end record;
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   -- Return true if current element is last in the list.
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   function End_Of_List (L : List_Type) return boolean;
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   -- Set "current" pointer to first list element.
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   procedure Reset (L : in out List_Type);
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end CA11014_0;
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     --==================================================================--
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package body CA11014_0 is
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   function End_Of_List (L : List_Type) return boolean is
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   begin
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      return (L.Current = null);
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   end End_Of_List;
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   -------------------------------------------------------
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   procedure Reset (L : in out List_Type) is
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   begin
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      L.Current := L.First;                 -- Set "current" pointer to first
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   end Reset;                               -- list element.
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end CA11014_0;
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     --==================================================================--
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with CA11014_0;            -- Generic list abstraction.
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pragma Elaborate (CA11014_0);
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generic
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   -- Import the list abstraction defined in CA11014_0.
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   with package List_Mgr is new CA11014_0 (<>);
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package CA11014_1 is
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   -- Write to current element and advance "current" pointer.
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   procedure Write_Element (L : in out List_Mgr.List_Type;
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                            E : in     List_Mgr.Element_Type);
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   -- Read from current element and advance "current" pointer.
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   procedure Read_Element (L : in out List_Mgr.List_Type;
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                           E :    out List_Mgr.Element_Type);
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   -- Add element to end of list.
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   procedure Add_Element (L : in out List_Mgr.List_Type;
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                          E : in     List_Mgr.Element_Type);
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end CA11014_1;
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     --==================================================================--
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package body CA11014_1 is
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   procedure Write_Element (L : in out List_Mgr.List_Type;
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                            E : in     List_Mgr.Element_Type) is
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   begin
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      L.Current.Item := E;               -- Write to current element.
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      L.Current      := L.Current.Next;  -- Advance "current" pointer.
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   end Write_Element;
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   -------------------------------------------------------
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   procedure Read_Element (L : in out List_Mgr.List_Type;
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                           E :    out List_Mgr.Element_Type) is
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   begin
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      E         := L.Current.Item;       -- Retrieve current element.
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      L.Current := L.Current.Next;       -- Advance "current" pointer.
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   end Read_Element;
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   -------------------------------------------------------
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   procedure Add_Element (L : in out List_Mgr.List_Type;
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                          E : in     List_Mgr.Element_Type) is
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      New_Node : List_Mgr.Node_Pointer := new List_Mgr.Node_Type'(E, null);
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       use type List_Mgr.Node_Pointer;
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   begin
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      if L.First = null then                -- No elements in list, so add new
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         L.First := New_Node;               -- element at beginning of list.
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      else
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         L.Last.Next := New_Node;           -- Add new element at end of list.
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      end if;
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      L.Last := New_Node;                   -- Set last-in-list pointer.
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   end Add_Element;
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154
end CA11014_1;
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     --==================================================================--
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-- Generic child of list operation.  This child adds a layer of
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-- functionality to the parent generic.
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generic
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163
package CA11014_1.CA11014_2 is
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   procedure Write_First_To_List (L : in out List_Mgr.List_Type);
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   -- ... Various other operations used by the application.
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end CA11014_1.CA11014_2;
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     --==================================================================--
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package body CA11014_1.CA11014_2 is
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   procedure Write_First_To_List (L : in out List_Mgr.List_Type) is
176
   begin
177
      List_Mgr.Reset (L);    -- Parent's formal package.
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      while not List_Mgr.End_Of_List (L) loop     -- Parent's formal package.
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         Write_Element (L, List_Mgr.Element_Type'First);
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                                                  -- Parent's operation,
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      end loop;                                   -- parent's formal.
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184
   end Write_First_To_List;
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186
end CA11014_1.CA11014_2;
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     --==================================================================--
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package CA11014_3 is
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   type Points is range 0 .. 100;
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   -- ... Various other types used by the application.
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196
end CA11014_3;
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-- No body for CA11014_3;
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201
     --==================================================================--
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203
-- Declare instances of the generic list packages for the discrete type.
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-- The instance of the child must itself be declared as a child of the
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-- instance of the parent.
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with CA11014_0;               -- Generic list abstraction.
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with CA11014_3;               -- Package containing discrete type declaration.
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pragma Elaborate (CA11014_0);
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package CA11014_4 is new CA11014_0 (CA11014_3.Points);  -- Points list.
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with CA11014_4;               -- Points list.
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with CA11014_1;               -- Generic list operation.
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pragma Elaborate (CA11014_1);
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package CA11014_5 is new CA11014_1 (CA11014_4);         -- Scores list.
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with CA11014_1.CA11014_2;     -- Additional generic list operation,
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with CA11014_5;
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pragma Elaborate (CA11014_5);
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package CA11014_5.CA11014_6 is new CA11014_5.CA11014_2;
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                                                   -- Points list operation.
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     --==================================================================--
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with CA11014_1.CA11014_2;      -- Additional generic list operation,
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                               -- implicitly with list operation.
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with CA11014_3;                -- Package containing discrete type declaration.
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with CA11014_4;                -- Points list.
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with CA11014_5.CA11014_6;      -- Points list operation.
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with Report;
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procedure CA11014 is
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   package Lists_Of_Scores renames CA11014_4;
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   package Score_Ops renames CA11014_5;
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   package Point_Ops renames CA11014_5.CA11014_6;
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   Scores : Lists_Of_Scores.List_Type;                -- List of points.
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240
   type TC_Score_Array is array (1 .. 3) of CA11014_3.Points;
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242
   TC_Initial_Values : constant TC_Score_Array := (10, 21, 49);
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   TC_Final_Values   : constant TC_Score_Array := (0, 0, 0);
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   TC_Initial_Values_Are_Correct : boolean := false;
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   TC_Final_Values_Are_Correct   : boolean := false;
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248
               --------------------------------------------------
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   -- Initial list contains 3 scores with the values 10, 21, and 49.
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   procedure TC_Initialize_List (L : in out Lists_of_Scores.List_Type) is
252
   begin
253
      for I in TC_Score_Array'range loop
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         Score_Ops.Add_Element (L, TC_Initial_Values(I));
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                   -- Operation from generic parent.
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      end loop;
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   end TC_Initialize_List;
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259
               --------------------------------------------------
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   -- Verify that all scores have been set to zero.
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   procedure TC_Verify_List (L        : in out Lists_of_Scores.List_Type;
263
                             Expected : in     TC_Score_Array;
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                             OK       :    out boolean) is
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      Actual : TC_Score_Array;
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   begin
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      Lists_of_Scores.Reset (L);       -- Operation from parent's formal.
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      for I in TC_Score_Array'range loop
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         Score_Ops.Read_Element (L, Actual(I));
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                   -- Operation from generic parent.
271
      end loop;
272
      OK := (Actual = Expected);
273
   end TC_Verify_List;
274
 
275
               --------------------------------------------------
276
 
277
begin -- CA11014
278
 
279
   Report.Test ("CA11014", "Check that an instantiation of a child package " &
280
                           "of a generic package can use its parent's "      &
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                           "declarations and operations, including a "       &
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                           "formal package of the parent");
283
 
284
   TC_Initialize_List (Scores);
285
   TC_Verify_List (Scores, TC_Initial_Values, TC_Initial_Values_Are_Correct);
286
 
287
   if not TC_Initial_Values_Are_Correct then
288
      Report.Failed ("List contains incorrect initial values");
289
   end if;
290
 
291
   Point_Ops.Write_First_To_List (Scores);
292
                   -- Operation from generic child package.
293
 
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   TC_Verify_List (Scores, TC_Final_Values, TC_Final_Values_Are_Correct);
295
 
296
   if not TC_Final_Values_Are_Correct then
297
      Report.Failed ("List contains incorrect final values");
298
   end if;
299
 
300
   Report.Result;
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end CA11014;

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