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	description: "[
		Objects that are able to iterate over cursor trees, 
		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, cursor_tree_iterators, cursor_tree_iteration, tree_iterators, tree_iteration
	exploration: depth_first, breadth_first
	traversal: preorder, postorder, inorder
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

class 
	CURSOR_TREE_ITERATOR [G]

inherit
	LINEAR_ITERATOR [G]
		rename
			do_all as pre_do_all,
			until_do as pre_until_do,
			do_until as pre_do_until,
			do_if as pre_do_if,
			search as pre_search,
			do_for as pre_do_for,
			do_while as pre_do_while,
			while_do as pre_while_do,
			while_continue as pre_while_continue,
			continue_while as pre_continue_while,
			continue_until as pre_continue_until,
			continue_search as pre_continue_search,
			continue_for as pre_continue_for,
			for_all as pre_for_all,
			there_exists as pre_there_exists,
			forth as pre_forth
		redefine
			target,
			pre_forth
		select
			pre_do_all,
			pre_until_do,
			pre_do_until,
			pre_do_if,
			pre_search,
			pre_do_for,
			pre_continue_until,
			pre_continue_search,
			pre_continue_for,
			pre_for_all,
			pre_there_exists,
			pre_forth,
			start,
			pre_while_do,
			pre_do_while,
			pre_continue_while,
			pre_while_continue
		end

	LINEAR_ITERATOR [G]
		rename
			do_all as post_do_all,
			until_do as post_until_do,
			do_until as post_do_until,
			do_if as post_do_if,
			search as post_search,
			do_for as post_do_for,
			do_while as post_do_while,
			while_do as post_while_do,
			while_continue as post_while_continue,
			continue_while as post_continue_while,
			continue_until as post_continue_until,
			continue_search as post_continue_search,
			continue_for as post_continue_for,
			for_all as post_for_all,
			there_exists as post_there_exists,
			forth as post_forth,
			start as post_start
		redefine
			post_forth,
			post_start,
			target
		end

	LINEAR_ITERATOR [G]
		rename
			do_all as breadth_do_all,
			until_do as breadth_until_do,
			do_until as breadth_do_until,
			do_if as breadth_do_if,
			search as breadth_search,
			do_for as breadth_do_for,
			do_while as breadth_do_while,
			while_do as breadth_while_do,
			while_continue as breadth_while_continue,
			continue_while as breadth_continue_while,
			continue_until as breadth_continue_until,
			continue_search as breadth_continue_search,
			continue_for as breadth_continue_for,
			for_all as breadth_for_all,
			there_exists as breadth_there_exists,
			forth as breadth_forth
		redefine
			breadth_forth,
			target
		end

feature -- Status report

	target: CURSOR_TREE [G]
			-- The structure to which iteration features will apply
	
feature -- Cursor movement

	pre_start is
			-- Move cursor of target to root position
			-- (first position in preorder and breadth-first).
			-- Was declared in CURSOR_TREE_ITERATOR as synonym of breadth_start.
		do
			target.start
		end

	breadth_start is
			-- Move cursor of target to root position
			-- (first position in preorder and breadth-first).
			-- Was declared in CURSOR_TREE_ITERATOR as synonym of pre_start.
		do
			target.start
		end

	post_start is
			-- Move cursor of target to first position in postorder.
		do
			target.postorder_start
		end

	pre_forth is
			-- Move cursor of target to next position in preorder.
		do
			target.preorder_forth
		end

	post_forth is
			-- Move cursor of target to next position in postorder.
		do
			target.postorder_forth
		end

	breadth_forth is
			-- Move cursor of target to next position in breadth-first.
		do
			target.breadth_forth
		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 CURSOR_TREE_ITERATOR


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