Struct futures_util::stream::Unfold
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[src]
#[must_use = "streams do nothing unless polled"]pub struct Unfold<T, F, Fut> where
Fut: IntoFuture, { /* fields omitted */ }
A stream which creates futures, polls them and return their result
This stream is returned by the futures::stream::unfold method
Trait Implementations
impl<T: Debug, F: Debug, Fut: Debug> Debug for Unfold<T, F, Fut> where
Fut: IntoFuture,
Fut::Future: Debug, [src]
Fut: IntoFuture,
Fut::Future: Debug,
fn fmt(&self, __arg_0: &mut Formatter) -> Result[src]
Formats the value using the given formatter. Read more
impl<T, F, Fut, It> Stream for Unfold<T, F, Fut> where
F: FnMut(T) -> Fut,
Fut: IntoFuture<Item = Option<(It, T)>>, [src]
F: FnMut(T) -> Fut,
Fut: IntoFuture<Item = Option<(It, T)>>,
type Item = It
Values yielded by the stream.
type Error = Fut::Error
Errors yielded by the stream.
fn poll_next(&mut self, cx: &mut Context) -> Poll<Option<It>, Fut::Error>[src]
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. Read more