note
	description: "Sets implemented by linked lists"
	library: "Free implementation of ELKS library"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	names: linked_set, set, linked_list
	representation: linked
	access: membership
	contents: generic
	date: "$Date: 2019-07-05 15:26:16 +0000 (Fri, 05 Jul 2019) $"
	revision: "$Revision: 103325 $"

class 
	LINKED_SET [G]

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

	LINKED_LIST [G]
		rename
			extend as ll_extend,
			has as has alias "∋",
			put as ll_put,
			prune as ll_prune
		export
			{NONE} ll_extend, ll_put, ll_prune
		undefine
			changeable_comparison_criterion,
			is_inserted
		redefine
			make_from_iterable
		end

create 
	make,
	make_from_iterable

feature {NONE} -- Creation

	make_from_iterable (other: ITERABLE [G])
			-- Create a set with all items obtained from other.
		do
			make
			across
				other as o
			loop
				extend (o.item)
			end
		end
	
feature -- Element change

	put (v: G)
			-- Ensure that set includes v.
			-- Was declared in LINKED_SET as synonym of extend.
		do
			if is_empty or else not has (v) then
				ll_extend (v)
			end
		end

	extend (v: G)
			-- Ensure that set includes v.
			-- Was declared in LINKED_SET as synonym of put.
		do
			if is_empty or else not has (v) then
				ll_extend (v)
			end
		end
	
feature -- Removal

	prune (v: like item)
			-- Remove v if present.
		do
			start
			ll_prune (v)
		end
	
note
	copyright: "Copyright (c) 1984-2019, 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 LINKED_SET

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