Struct futures_util::stream::TryUnfold

#[must_use = "streams do nothing unless polled"]pub struct TryUnfold<T, F, Fut> { /* fields omitted */ }

Stream for the try_unfold function.

Trait Implementations

impl<T, F, Fut> Debug for TryUnfold<T, F, Fut> where
    T: Debug,
    Fut: Debug, 

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T, F, Fut, Item> Stream for TryUnfold<T, F, Fut> where
    F: FnMut(T) -> Fut,
    Fut: TryFuture<Ok = Option<(Item, T)>>, 

type Item = Result<Item, Fut::Error>

Values yielded by the stream.

fn poll_next(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>
) -> Poll<Option<Self::Item>>

Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted.

pub fn size_hint(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the stream.

impl<'__pin, T, F, Fut> Unpin for TryUnfold<T, F, Fut> where
    __Origin<'__pin, T, F, Fut>: Unpin,