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indexing
	description: "[
		Subsets that are traversable linearly without commitment to a concrete
		implementation.
	]"
	status: "See notice at end of class"
	names: linear_subset, subset, set
	access: membership
	contents: generic
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

deferred class interface
	LINEAR_SUBSET [G]

feature -- Access

	index: INTEGER
			-- Current index
	
feature -- Status report

	before: BOOLEAN
			-- Is cursor at left from first item?

	islast: BOOLEAN
			-- Is cursor at last item?

	valid_index (n: INTEGER): BOOLEAN
			-- Is n a valid index?
		ensure
			index_valid: 0 <= n and n <= count + 1
	
feature -- Cursor movement

	go_i_th (i: INTEGER)
			-- Move cursor to i-th item.
		require
			valid_index: valid_index (i)
		ensure
			cursor_moved: index = i
	
feature -- Element change

	put_left (v: G)
			-- Insert v before the cursor.
		require
			item_exists: v /= void
			not_before: not before
		ensure
			cursor_position_unchanged: index = old index + 1

	move_item (v: G)
			-- Move v to the left of cursor.
		require
			item_exists: v /= void
			item_in_set: has (v)
	
invariant

	before_definition: before = (index = 0)

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 LINEAR_SUBSET


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