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indexing
	description: "Circular chains implemented as linked lists"
	status: "See notice at end of class"
	names: linked_circular, ring, sequence
	representation: linked
	access: index, cursor, membership
	contents: generic
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

class interface
	LINKED_CIRCULAR [G]

create 
	make

feature -- Initialization

	make
			-- Create an empty list
	
feature -- Measurement

	count: INTEGER
			-- Number of items
	
feature -- Element change

	replace (v: G)
			-- Replace current item by v.

	merge_right (other: like Current)
			-- Merge other into current structure after cursor
			-- position. Do not move cursor. Empty other.

	put_right (v: like item)
			-- Add v to the right of cursor position.
			-- Do not move cursor.

	put_front (v: like item)
			-- Add v to beginning.
			-- Do not move cursor.

	extend (v: like item)
			-- Add v to end.
			-- Do not move cursor.

	merge_left (other: like Current)
			-- Merge other into current structure before cursor
			-- position. Do not move cursor. Empty other.

	put_left (v: like item)
			-- Add v to the left of cursor position.
			-- Do not move cursor.
	
feature -- Access

	item: G
			-- Current item

	cursor: CURSOR
			-- Current cursor position
	
feature -- Status report

	Full: BOOLEAN is False
			-- Is structured filled to capacity? (Answer: no.)

	readable: BOOLEAN
			-- Is there a current item that may be read?

	valid_cursor (p: CURSOR): BOOLEAN
			-- Can the cursor be moved to position p?

	writable: BOOLEAN
			-- Is there a current item that may be written?

	isfirst: BOOLEAN
			-- Is cursor on first item?

	islast: BOOLEAN
			-- Is cursor on last item?
	
feature -- Cursor movement

	go_to (p: CURSOR)
			-- Move cursor to position p.

	set_start
			-- Select current item as the first.

	start
			-- Move to position currently selected as first.
	
feature -- Removal

	remove_left
			-- Remove item to the left of cursor position.
			-- Do not move cursor.
		require else
			count > 1

	remove_right
			-- Remove item to the right of cursor position.
			-- Do not move cursor.
		require else
			count > 1
	
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 LINKED_CIRCULAR


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