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1 149 jeremybenn
-- CA11020.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 body of the generic parent package can depend on one of
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--      its own public generic children.
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--
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-- TEST DESCRIPTION:
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--      A scenario is created that demonstrates the potential of adding a
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--      public generic child during code maintenance without distubing a large
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--      subsystem.  After child is added to the subsystem, a maintainer
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--      decides to take advantage of the new functionality and rewrites
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--      the parent's body.
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--
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--      Declare a bag abstraction in a generic package. Declare a public
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--      generic child of this package which adds a generic procedure to the
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--      original subsystem.  In the parent body, instantiate the public
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--      child.  Then instantiate the procedure as a child instance of the
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--      public child instance.
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--
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--      In the main program, declare an instance of parent.  Check that the
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--      operations in both parent and child packages 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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--
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--!
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-- Simulates bag application.
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generic
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   type Element is private;
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   with function Image (E : Element) return String;
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package CA11020_0 is
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   type Bag is limited private;
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   procedure Add (E : in Element; To_The_Bag : in out Bag);
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   function Bag_Image (B : Bag) return string;
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private
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   type Node_Type;
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   type Bag is access Node_Type;
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   type Node_Type is
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      record
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         The_Element : Element;
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         -- Other components in real application, i.e.,
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         -- The_Count   : positive;
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         Next        : Bag;
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      end record;
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end CA11020_0;
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     --==================================================================--
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-- More operations on Bag.
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generic
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-- Parameters go here.
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package CA11020_0.CA11020_1 is
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   -- ... Other declarations.
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   generic                            -- Generic iterator procedure.
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      with procedure Use_Element (E : in Element);
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   procedure Iterate (B : in Bag);    -- Called once per element in the bag.
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   -- ... Various other operations.
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end CA11020_0.CA11020_1;
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     --==================================================================--
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package body CA11020_0.CA11020_1 is
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   procedure Iterate (B : in Bag) is
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   -- Traverse each element in the bag.
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      Elem : Bag := B;
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   begin
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      while Elem /= null loop
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         Use_Element (Elem.The_Element);
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         Elem := Elem.Next;
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      end loop;
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   end Iterate;
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end CA11020_0.CA11020_1;
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     --==================================================================--
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with CA11020_0.CA11020_1;    -- Public generic child package.
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package body CA11020_0 is
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   ----------------------------------------------------
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   -- Parent's body depends on public generic child. --
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   ----------------------------------------------------
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   -- Instantiate the public child.
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   package MS is new CA11020_1;
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   function Bag_Image (B : Bag) return string is
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      Buffer : String (1 .. 10_000);
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      Last   : Integer := 0;
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      -----------------------------------------------------
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      -- Will be called by the iterator.
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      procedure Append_Image (E : in Element) is
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         Im : constant String := Image (E);
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      begin  -- Append_Image
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         if Last /= 0 then        -- Insert a comma.
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            Last := Last + 1;
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            Buffer (Last) := ',';
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         end if;
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         Buffer (Last + 1 .. Last + Im'Length) := Im;
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         Last := Last + Im'Length;
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      end Append_Image;
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      -----------------------------------------------------
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      -- Instantiate procedure Iterate as a child of instance MS.
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      procedure Append_All is new MS.Iterate (Use_Element => Append_Image);
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   begin  -- Bag_Image
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      Append_All (B);
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      return Buffer (1 .. Last);
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   end Bag_Image;
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           -----------------------------------------------------
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   procedure Add (E : in Element; To_The_Bag : in out Bag) is
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      -- Not a real bag addition.
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      Index : Bag := To_The_Bag;
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   begin
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      -- ... Error-checking code omitted for brevity.
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      if Index = null then
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         To_The_Bag := new Node_Type' (The_Element => E,
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                                       Next        => null);
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      else
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         -- Goto the end of the list.
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         while Index.Next /= null loop
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            Index := Index.Next;
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         end loop;
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         -- Add element to the end of the list.
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         Index.Next := new Node_Type' (The_Element => E,
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                                       Next        => null);
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      end if;
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   end Add;
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end CA11020_0;
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     --==================================================================--
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with CA11020_0;               -- Bag application.
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with Report;
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procedure CA11020 is
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    -- Instantiate the bag application for integer type and attribute
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    -- Image.
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    package Bag_Of_Integers is new CA11020_0 (Integer, Integer'Image);
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    My_Bag : Bag_Of_Integers.Bag;
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begin
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   Report.Test ("CA11020", "Check that body of the generic parent package " &
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                "can depend on one of its own public generic children");
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   -- Add 10 consecutive integers to the bag.
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   for I in 1 .. 10 loop
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      Bag_Of_Integers.Add (I, My_Bag);
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   end loop;
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   if Bag_Of_Integers.Bag_Image (My_Bag)
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      /= " 1, 2, 3, 4, 5, 6, 7, 8, 9, 10" then
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         Report.Failed ("Incorrect results");
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   end if;
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   Report.Result;
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end CA11020;

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