Struct std::iter::Unfold

pub struct Unfold<'self, A, St> {
    priv f: &'self fn(&mut St) -> Option<A>,
    state: St,
}

An iterator which just modifies the contained state throughout iteration.

Methods

Creates a new iterator with the specified closure as the "iterator function" and an initial state to eventually pass to the iterator

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.