Struct futures_state_stream::Unfold

pub struct Unfold<T, F, Fut> where
    Fut: IntoFuture,  { /* fields omitted */ }

A stream which iteratively applies a closure to state to produce items.

Trait Implementations

impl<T, F, Fut, It, St, E> StateStream for Unfold<T, F, Fut> where
    F: FnMut(T) -> Fut,
    Fut: IntoFuture<Item = StreamEvent<(It, T), St>, Error = (E, St)>, 

type Item = It

The items being streamed.

type State = St

The state returned when streaming completes.

type Error = E

The error returned.

fn poll(&mut self) -> Poll<StreamEvent<It, St>, (E, St)>

Similar to Stream::poll.

fn into_future(self) -> IntoFuture<Self> where
    Self: Sized, 

Returns a future which yields the next element of the stream.

fn into_stream(self) -> IntoStream<Self> where
    Self: Sized, 

Returns a normal Stream which yields the elements of this stream and discards the state.

fn map<F, B>(self, f: F) -> Map<Self, F> where
    Self: Sized,
    F: FnMut(Self::Item) -> B, 

Returns a stream which applies a transform to items of this stream.

fn map_err<F, B>(self, f: F) -> MapErr<Self, F> where
    Self: Sized,
    F: FnMut(Self::Error) -> B, 

Returns a stream which applies a transform to errors of this stream.

fn map_state<F, B>(self, f: F) -> MapState<Self, F> where
    Self: Sized,
    F: FnOnce(Self::State) -> B, 

Returns a stream which applies a transform to the state of this stream.

fn filter<F>(self, f: F) -> Filter<Self, F> where
    Self: Sized,
    F: FnMut(&Self::Item) -> bool, 

Returns a stream which filters items of this stream by a predicate.

fn filter_map<F, B>(self, f: F) -> FilterMap<Self, F> where
    Self: Sized,
    F: FnMut(Self::Item) -> Option<B>, 

Returns a stream which filters and transforms items of this stream by a predicate.

fn collect(self) -> Collect<Self> where
    Self: Sized, 

Returns a stream which collects all items of this stream into a Vec, returning it along with the stream's state.

fn for_each<F>(self, f: F) -> ForEach<Self, F> where
    Self: Sized,
    F: FnMut(Self::Item), 

Returns a future which applies a closure to each item of this stream.