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note
	description: "[
		Sets whose items may be compared according to a partial order relation
		implemented as sorted two-way lists.
	]"
	library: "Free implementation of ELKS library"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	names: sorted_set, set, two_way_list
	representation: linked
	access: membership, min, max
	contents: generic
	date: "$Date: 2012-07-23 14:02:19 -0700 (Mon, 23 Jul 2012) $"
	revision: "$Revision: 91989 $"

class 
	PART_SORTED_SET [G -> PART_COMPARABLE]

inherit
	LINEAR_SUBSET [G]
		undefine
			prune_all,
			changeable_comparison_criterion,
			copy,
			is_equal,
			fill
		redefine
			merge
		select
			extend,
			prune,
			put
		end

	PART_SORTED_TWO_WAY_LIST [G]
		rename
			extend as pstwl_extend,
			prune as pstwl_prune,
			put as pstwl_put,
			merge as pstwl_merge
		export
			{ANY} duplicate, forth, item, after, start, put_left, finish, readable, writable, valid_cursor_index
			{PART_SORTED_SET} cursor, go_to, first_element, last_element, valid_cursor
			{NONE} all
		redefine
			duplicate
		end

create 
	make


create {PART_SORTED_SET}
	make_sublist

feature -- Element change

	extend (v: G)
			-- Ensure that structure includes `v'.
			-- Was declared in PART_SORTED_SET as synonym of put.
		do
			search_after (v)
			if after or else v /~ item then
				put_left (v)
			end
		end

	put (v: G)
			-- Ensure that structure includes `v'.
			-- Was declared in PART_SORTED_SET as synonym of extend.
		do
			search_after (v)
			if after or else v /~ item then
				put_left (v)
			end
		end

	merge (other: TRAVERSABLE_SUBSET [G])
			-- Add all items of `other'.
		local
			i: like item
			o: like item
		do
			from
				start
				other.start
			until
				other.after or else after
			loop
				i := item
				o := other.item
				if i /= Void and then o /= Void then
					if i < o then
						forth
					elseif i ~ o then
						forth
						other.forth
					else
						put_left (o)
						other.forth
					end
				end
			end
			if after then
				from
				until
					other.after
				loop
					put_left (other.item)
					other.forth
				end
			end
		end
	
feature -- Removal

	prune (v: like item)
			-- Remove `v' if present.
		do
			start
			pstwl_prune (v)
		end
	
feature -- Duplication

	duplicate (n: INTEGER_32): like Current
			-- Copy of sub-set beginning at cursor position
			-- and having min (`n', count - index + 1) items
		local
			pos: CURSOR
			counter: INTEGER_32
		do
			pos := cursor
			Result := new_chain
			Result.finish
			from
			until
				(counter = n) or else after
			loop
				Result.put_left (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 PART_SORTED_SET


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