--     The Ada Structured Library - A set of container classes and general
--     tools for use with Ada95.
--     Copyright (C) 1998  Corey Minyard (minyard@acm.org)
--
--     This library is free software; you can redistribute it and/or
--     modify it under the terms of the GNU Library General Public
--     License as published by the Free Software Foundation; either
--     version 2 of the License, or (at your option) any later version.
--
--     This library is distributed in the hope that it will be useful,
--     but WITHOUT ANY WARRANTY; without even the implied warranty of
--     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
--     Library General Public License for more details.
--
--     You should have received a copy of the GNU Library General Public
--     License along with this library; if not, write to the Free
--     Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
--     MA 02111-1307, USA
--

-- All list containers implement the following interface.  Lists are
-- defined to have a tail and a head, so we can add to those positions.

generic
package Asgc.List is

   type Object is abstract new Asgc.Object with private;
   type Object_Class is access all Object'Class;

   function "=" (O1, O2 : in Object) return Boolean is abstract;

   procedure Add (O : in out Object; Val : in Contained_Type);

   -- Add an item to the first position in the list.
   procedure Add_Head (O : in out Object; Val : in Contained_Type)
     is abstract;

   -- Add an item to the last position in the list.
   procedure Add_Tail (O : in out Object; Val : in Contained_Type)
     is abstract;

   type Iterator is abstract new Asgc.Iterator with private;
   type Iterator_Class is access all Iterator'Class;

   function "=" (Iter1, Iter2 : in Iterator) return Boolean is abstract;

   -- Add an item before the position the iterator references.
   procedure Add_After (Iter : in out Iterator; Val : in Contained_Type)
      is abstract;

   -- Add an item after the position the iterator references.
   procedure Add_Before (Iter : in out Iterator; Val : in Contained_Type)
      is abstract;

   -- Set the value of the item the iterator references.
   procedure Set (Iter : in Iterator; Val : in Contained_Type)
      is abstract;

private

   Internal_List_Error : exception;

   type Object is abstract new Asgc.Object with null record;

   type Iterator is abstract new Asgc.Iterator with null record;

end Asgc.List;