struct Iterator {
	~Vector v,
	int pos
}

/; method Iterator
	/; init(~Vector v)
		self.v = v
		self.pos = 0
	;/

	/; get [~void]
		return self.v`.get(self.pos)
	;/

	/; next
		/; if (self.pos + 1 < self.v`.count)
			self.pos++
		;/
	;/

	/; prev
		/; if (self.pos > 0)
			self.pos--
		;/
	;/
;/