Method remove_multi

code/chapter09/conshash.rs:67–73

批量删除结点

(&mut self, nodes: &[T])

    // 批量删除结点
    fn remove_multi(&mut self, nodes: &[T]) {
        if !nodes.is_empty() {
            for node in nodes.iter() {
                self.remove(node);
            }
        }
    }

    fn remove(&mut self, node: &T) {
        assert!(!self.ring.is_empty());