private class HashSetIterator[E]
	super Iterator[E]
	redef fun is_ok do return _node != null

	redef fun item
	do
		assert is_ok
		return _node._key
	end

	redef fun next
	do
		assert is_ok
		_node = _node._next_item
	end

	# The set to iterate on
	var set: HashSet[E]

	# The position in the internal map storage
	var node: nullable HashSetNode[E] = null

	init
	do
		_node = _set._first_item
	end
end