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note
	description: "[
		Active structures, which always have a current position
		accessible through a cursor.
	]"
	library: "Free implementation of ELKS library"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	names: cursor_structure, access
	access: cursor, membership
	contents: generic
	date: "$Date: 2012-07-23 14:02:19 -0700 (Mon, 23 Jul 2012) $"
	revision: "$Revision: 91989 $"

deferred class 
	CURSOR_STRUCTURE [G]

inherit
	ACTIVE [G]

feature -- Access

	cursor: CURSOR
			-- Current cursor position
		deferred
		ensure
			cursor_not_void: Result /= Void
		end
	
feature -- Status report

	valid_cursor (p: CURSOR): BOOLEAN
			-- Can the cursor be moved to position `p'?
		deferred
		end
	
feature -- Cursor movement

	go_to (p: CURSOR)
			-- Move cursor to position `p'.
		require
			cursor_position_valid: valid_cursor (p)
		deferred
		end
	
note
	copyright: "Copyright (c) 1984-2012, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
		Eiffel Software
		5949 Hollister Ave., Goleta, CA 93117 USA
		Telephone 805-685-1006, Fax 805-685-6869
		Website http://www.eiffel.com
		Customer support http://support.eiffel.com
	]"

end -- class CURSOR_STRUCTURE


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