Struct futures::stream::Then

[+] Show declaration

[+] Expand attributes
#[must_use = "streams do nothing unless polled"]
pub struct Then<St, Fut, F> { /* fields omitted */ }

[−] Expand description

A stream combinator which chains a computation onto each item produced by a stream.

This structure is produced by the Stream::then method.

Trait Implementations

impl<St, Fut, F> Unpin for Then<St, Fut, F> where     Fut: Unpin,     St: Unpin,

impl<St, Fut, F> Debug for Then<St, Fut, F> where     F: Debug,     Fut: Debug,     St: Debug,

[+]

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

[−]

Formats the value using the given formatter.

impl<St, Fut, F> Stream for Then<St, Fut, F> where     F: FnMut(<St as Stream>::Item) -> Fut,     Fut: Future,     St: Stream,

[+]

type Item = <Fut as Future>::Output

Values yielded by the stream.

fn poll_next(     self: PinMut<Then<St, Fut, F>>,     cx: &mut Context ) -> Poll<Option<<Fut as Future>::Output>>

[−]

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.