private class PipeSelect[E]
	super Iterator[E]

	var source: Iterator[E]

	var predicate: Function[E, Bool]

	init do do_skip

	fun do_skip
	do
		while source.is_ok and not predicate.apply(source.item) do source.next
	end

	redef fun is_ok do return source.is_ok

	redef fun item do return source.item

	redef fun next
	do
		source.next
		do_skip
	end
end