iterator.go
func (it *Iterator) Init(list *Skiplist) {
	it.list = list
	it.arena = list.arena
	it.nd = nil
	it.value = 0
}
func (it *Iterator) Init(list *Skiplist) {
	it.list = list
	it.arena = list.arena
	it.nd = nil
	it.value = 0
}
func ( it * Iterator ) Init ( list * Skiplist ) { it . list = list it . arena = list . arena it . nd = nil it . value = 0 }
// Init associates the iterator with a skiplist and resets all state.
Init associates the iterator with a skiplist and resets all state .