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	description: "[
		Objects that are able to iterate over two-way chains,
		on which they can perform repeated actions and tests according
		to a number of predefined control structures such as ``if'',
		``until'' and others.
	]"
	status: "See notice at end of class"
	names: iterators, iteration, two_way_chain_iterators, two_way_chain_iteration
	traversal: sequential
	exploration: forward, backward
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

class 
	TWO_WAY_CHAIN_ITERATOR [G]

inherit
	LINEAR_ITERATOR [G]
		redefine
			target
		select
			start,
			forth,
			do_all,
			until_do,
			do_until,
			while_do,
			do_while,
			do_if,
			do_for,
			search,
			for_all,
			there_exists,
			until_continue,
			continue_until,
			while_continue,
			continue_while,
			continue_for,
			continue_search
		end

	LINEAR_ITERATOR [G]
		rename
			start as finish,
			forth as back,
			do_all as do_all_back,
			until_do as until_do_back,
			do_until as do_until_back,
			do_while as do_while_back,
			while_do as while_do_back,
			do_if as do_if_back,
			do_for as do_for_back,
			search as search_back,
			for_all as for_all_back,
			there_exists as there_exists_back,
			until_continue as until_continue_back,
			continue_until as continue_until_back,
			while_continue as while_continue_back,
			continue_while as continue_while_back,
			continue_for as continue_for_back,
			continue_search as continue_search_back
		redefine
			back,
			finish,
			target
		end

feature -- Access

	target: CHAIN [G]
	
feature -- Cursor movement

	finish is
			-- Move cursor of target to last position.
		do
			target.finish
		end

	back is
			-- Move cursor of target backward one position.
		do
			target.back
		end
	
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 TWO_WAY_CHAIN_ITERATOR


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