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note
	description: "Dynamically modifiable circular chains"
	library: "Free implementation of ELKS library"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	names: dynamic_circular, ring, sequence
	access: index, cursor, membership
	contents: generic
	date: "$Date: 2012-07-23 14:02:19 -0700 (Mon, 23 Jul 2012) $"
	revision: "$Revision: 91989 $"

deferred class 
	DYNAMIC_CIRCULAR [G]

inherit
	CIRCULAR [G]
		undefine
			prune,
			prune_all
		end

	DYNAMIC_CHAIN [G]
		undefine
			valid_cursor_index,
			search,
			first,
			last,
			finish,
			start,
			move,
			go_i_th,
			off,
			exhausted
		redefine
			duplicate
		end

feature -- Duplication

	duplicate (n: INTEGER_32): like Current
			-- Copy of sub-chain beginning at current position
			-- and having min (`n', count) items.
		local
			pos: CURSOR
			to_be_removed, counter: INTEGER_32
		do
			from
				Result := new_chain
				pos := cursor
				to_be_removed := count.min (n)
			until
				counter = to_be_removed
			loop
				Result.extend (item)
				forth
				counter := counter + 1
			end
			go_to (pos)
		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 DYNAMIC_CIRCULAR


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