Struct std::iter::Peekable

pub struct Peekable<A, T> {
    priv iter: T,
    priv peeked: Option<A>,
}

An iterator with a peek() that returns an optional reference to the next element.

Methods

Return a reference to the next element of the iterator with out advancing it, or None if the iterator is exhausted.

Advance the iterator and return the next value. Return None when the end is reached.

Return a lower bound and upper bound on the remaining length of the iterator.

The common use case for the estimate is pre-allocating space to store the results.