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indexing
	description: "[
		Sequential, one-way linked lists that call an action
		sequence when an item is removed or added.
	]"
	status: "See notice at end of class"
	keywords: "event, action, linked, list"
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

class 
	ACTIVE_LIST [G]

inherit
	INTERACTIVE_LIST [G]
		redefine
			default_create,
			on_item_added,
			on_item_removed
		end

create 
	default_create

feature {NONE} -- Initialization

	default_create is
			-- Initialize
		do
			Precursor {INTERACTIVE_LIST}
			create add_actions
			create remove_actions
		end
	
feature -- Access

	add_actions: ACTION_SEQUENCE [TUPLE [G]]
			-- Actions performed when an item has just been added.

	remove_actions: ACTION_SEQUENCE [TUPLE [G]]
			-- Actions performed when an item has just been removed.
	
feature -- Miscellaneous

	on_item_added (an_item: G) is
			-- an_item has just been added.
		do
			add_actions.call ([an_item])
		end

	on_item_removed (an_item: G) is
			-- an_item has just been removed.
		do
			remove_actions.call ([an_item])
		end
	
invariant

	add_actions_not_void: add_actions /= void
	remove_actions_not_void: remove_actions /= void

indexing
	library: "[
			EiffelBase: Library of reusable components for Eiffel.
	]"
	status: "[
			Copyright 1986-2001 Interactive Software Engineering (ISE).
			For ISE customers the original versions are an ISE product
			covered by the ISE Eiffel license and support agreements.
	]"
	license: "[
			EiffelBase may now be used by anyone as FREE SOFTWARE to
			develop any product, public-domain or commercial, without
			payment to ISE, under the terms of the ISE Free Eiffel Library
			License (IFELL) at http://eiffel.com/products/base/license.html.
	]"
	source: "[
			Interactive Software Engineering Inc.
			ISE Building
			360 Storke Road, Goleta, CA 93117 USA
			Telephone 805-685-1006, Fax 805-685-6869
			Electronic mail <info@eiffel.com>
			Customer support http://support.eiffel.com
	]"
	info: "[
			For latest info see award-winning pages: http://eiffel.com
	]"

end -- class ACTIVE_LIST


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