fullypeek

在迭代器中向前查看你想要查看的任意数量的元素，只要内存允许！

let mut peekable = vec![1, 2, 3].into_iter().fully_peekable();

assert_eq!(peekable.peek(), Some(&1));
assert_eq!(peekable.peek_many(2), vec!(Some(&1), Some(&2)));

peekable.next();

assert_eq!(peekable.peek(), Some(&2));
assert_eq!(peekable.peek_many(2), vec!(Some(&2), Some(&3)));

peekable.next();

assert_eq!(peekable.peek(), Some(&3));
assert_eq!(peekable.peek_many(2), vec!(Some(&3), None));

lib.rs:

该包包含一个迭代器，允许您查看任意数量的元素。