Trait ntex::Stream [−][src]
#[must_use = "streams do nothing unless polled"] pub trait Stream { type Item; fn poll_next(
self: Pin<&mut Self>,
cx: &mut Context<'_>
) -> Poll<Option<Self::Item>>; fn size_hint(&self) -> (usize, Option<usize>) { ... } }
Expand description
A stream of values produced asynchronously.
If Future<Output = T>
is an asynchronous version of T
, then Stream<Item = T>
is an asynchronous version of Iterator<Item = T>
. A stream
represents a sequence of value-producing events that occur asynchronously to
the caller.
The trait is modeled after Future
, but allows poll_next
to be called
even after a value has been produced, yielding None
once the stream has
been fully exhausted.
Associated Types
Required methods
fn poll_next(
self: Pin<&mut Self>,
cx: &mut Context<'_>
) -> Poll<Option<Self::Item>>
[src]
fn poll_next(
self: Pin<&mut Self>,
cx: &mut Context<'_>
) -> Poll<Option<Self::Item>>
[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.
Return value
There are several possible return values, each indicating a distinct stream state:
-
Poll::Pending
means that this stream’s next value is not ready yet. Implementations will ensure that the current task will be notified when the next value may be ready. -
Poll::Ready(Some(val))
means that the stream has successfully produced a value,val
, and may produce further values on subsequentpoll_next
calls. -
Poll::Ready(None)
means that the stream has terminated, andpoll_next
should not be invoked again.
Panics
Once a stream has finished (returned Ready(None)
from poll_next
), calling its
poll_next
method again may panic, block forever, or cause other kinds of
problems; the Stream
trait places no requirements on the effects of
such a call. However, as the poll_next
method is not marked unsafe
,
Rust’s usual rules apply: calls must never cause undefined behavior
(memory corruption, incorrect use of unsafe
functions, or the like),
regardless of the stream’s state.
If this is difficult to guard against then the fuse
adapter can be used
to ensure that poll_next
always returns Ready(None)
in subsequent
calls.
Provided methods
fn size_hint(&self) -> (usize, Option<usize>)
[src]
fn size_hint(&self) -> (usize, Option<usize>)
[src]Returns the bounds on the remaining length of the stream.
Specifically, size_hint()
returns a tuple where the first element
is the lower bound, and the second element is the upper bound.
The second half of the tuple that is returned is an Option
<
usize
>
.
A None
here means that either there is no known upper bound, or the
upper bound is larger than usize
.
Implementation notes
It is not enforced that a stream implementation yields the declared number of elements. A buggy stream may yield less than the lower bound or more than the upper bound of elements.
size_hint()
is primarily intended to be used for optimizations such as
reserving space for the elements of the stream, but must not be
trusted to e.g., omit bounds checks in unsafe code. An incorrect
implementation of size_hint()
should not lead to memory safety
violations.
That said, the implementation should provide a correct estimation, because otherwise it would be a violation of the trait’s protocol.
The default implementation returns (0,
None
)
which is correct for any
stream.
Implementations on Foreign Types
impl<S> Stream for AssertUnwindSafe<S> where
S: Stream,
[src]
impl<S> Stream for AssertUnwindSafe<S> where
S: Stream,
[src]impl<St, Fut, F> Stream for TrySkipWhile<St, Fut, F> where
F: FnMut(&<St as TryStream>::Ok) -> Fut,
Fut: TryFuture<Ok = bool, Error = <St as TryStream>::Error>,
St: TryStream,
impl<St, Fut, F> Stream for TrySkipWhile<St, Fut, F> where
F: FnMut(&<St as TryStream>::Ok) -> Fut,
Fut: TryFuture<Ok = bool, Error = <St as TryStream>::Error>,
St: TryStream,
impl<St> Stream for CatchUnwind<St> where
St: Stream + UnwindSafe,
impl<St> Stream for CatchUnwind<St> where
St: Stream + UnwindSafe,
impl<S, Item, E> Stream for SinkErrInto<S, Item, E> where
S: Sink<Item> + Stream,
<S as Sink<Item>>::Error: Into<E>,
impl<S, Item, E> Stream for SinkErrInto<S, Item, E> where
S: Sink<Item> + Stream,
<S as Sink<Item>>::Error: Into<E>,
impl<R> Stream for Lines<R> where
R: AsyncBufRead,
impl<R> Stream for Lines<R> where
R: AsyncBufRead,
impl<S, Item, U, Fut, F> Stream for With<S, Item, U, Fut, F> where
S: Stream + Sink<Item>,
F: FnMut(U) -> Fut,
Fut: Future,
impl<S, Item, U, Fut, F> Stream for With<S, Item, U, Fut, F> where
S: Stream + Sink<Item>,
F: FnMut(U) -> Fut,
Fut: Future,
impl<St> Stream for TryBuffered<St> where
St: TryStream,
<St as TryStream>::Ok: TryFuture,
<<St as TryStream>::Ok as TryFuture>::Error == <St as TryStream>::Error,
impl<St> Stream for TryBuffered<St> where
St: TryStream,
<St as TryStream>::Ok: TryFuture,
<<St as TryStream>::Ok as TryFuture>::Error == <St as TryStream>::Error,
impl<St, Fut, F> Stream for SkipWhile<St, Fut, F> where
F: FnMut(&<St as Stream>::Item) -> Fut,
Fut: Future<Output = bool>,
St: Stream,
impl<St, Fut, F> Stream for SkipWhile<St, Fut, F> where
F: FnMut(&<St as Stream>::Item) -> Fut,
Fut: Future<Output = bool>,
St: Stream,
impl<St> Stream for TryFlatten<St> where
St: TryStream,
<St as TryStream>::Ok: TryStream,
<<St as TryStream>::Ok as TryStream>::Error: From<<St as TryStream>::Error>,
impl<St> Stream for TryFlatten<St> where
St: TryStream,
<St as TryStream>::Ok: TryStream,
<<St as TryStream>::Ok as TryStream>::Error: From<<St as TryStream>::Error>,
impl<T, F, Fut, Item> Stream for Unfold<T, F, Fut> where
F: FnMut(T) -> Fut,
Fut: Future<Output = Option<(Item, T)>>,
impl<T, F, Fut, Item> Stream for Unfold<T, F, Fut> where
F: FnMut(T) -> Fut,
Fut: Future<Output = Option<(Item, T)>>,
impl<B, St, S, Fut, F> Stream for Scan<St, S, Fut, F> where
F: FnMut(&mut S, <St as Stream>::Item) -> Fut,
Fut: Future<Output = Option<B>>,
St: Stream,
impl<B, St, S, Fut, F> Stream for Scan<St, S, Fut, F> where
F: FnMut(&mut S, <St as Stream>::Item) -> Fut,
Fut: Future<Output = Option<B>>,
St: Stream,
impl<St, Fut, F> Stream for Filter<St, Fut, F> where
F: for<'a> FnMut1<&'a <St as Stream>::Item, Output = Fut>,
Fut: Future<Output = bool>,
St: Stream,
impl<St, Fut, F> Stream for Filter<St, Fut, F> where
F: for<'a> FnMut1<&'a <St as Stream>::Item, Output = Fut>,
Fut: Future<Output = bool>,
St: Stream,
impl<T, F, Fut, Item> Stream for TryUnfold<T, F, Fut> where
F: FnMut(T) -> Fut,
Fut: TryFuture<Ok = Option<(Item, T)>>,
impl<T, F, Fut, Item> Stream for TryUnfold<T, F, Fut> where
F: FnMut(T) -> Fut,
Fut: TryFuture<Ok = Option<(Item, T)>>,
impl<S, Item, U, St, F> Stream for WithFlatMap<S, Item, U, St, F> where
S: Stream + Sink<Item>,
F: FnMut(U) -> St,
St: Stream<Item = Result<Item, <S as Sink<Item>>::Error>>,
impl<S, Item, U, St, F> Stream for WithFlatMap<S, Item, U, St, F> where
S: Stream + Sink<Item>,
F: FnMut(U) -> St,
St: Stream<Item = Result<Item, <S as Sink<Item>>::Error>>,
impl<St, Fut, F> Stream for Then<St, Fut, F> where
F: FnMut(<St as Stream>::Item) -> Fut,
Fut: Future,
St: Stream,
impl<St, Fut, F> Stream for Then<St, Fut, F> where
F: FnMut(<St as Stream>::Item) -> Fut,
Fut: Future,
St: Stream,
impl<St, Fut, F, T> Stream for FilterMap<St, Fut, F> where
F: FnMut1<<St as Stream>::Item, Output = Fut>,
Fut: Future<Output = Option<T>>,
St: Stream,
impl<St, Fut, F, T> Stream for FilterMap<St, Fut, F> where
F: FnMut1<<St as Stream>::Item, Output = Fut>,
Fut: Future<Output = Option<T>>,
St: Stream,
impl<T> Stream for Pending<T>
impl<T> Stream for Pending<T>
impl<St1, St2> Stream for Chain<St1, St2> where
St1: Stream,
St2: Stream<Item = <St1 as Stream>::Item>,
impl<St1, St2> Stream for Chain<St1, St2> where
St1: Stream,
St2: Stream<Item = <St1 as Stream>::Item>,
impl<Fut> Stream for TryFlattenStream<Fut> where
Fut: TryFuture,
TryFlatten<Fut, <Fut as TryFuture>::Ok>: Stream,
impl<Fut> Stream for TryFlattenStream<Fut> where
Fut: TryFuture,
TryFlatten<Fut, <Fut as TryFuture>::Ok>: Stream,
impl<St, Fut, F, T> Stream for TryFilterMap<St, Fut, F> where
F: FnMut(<St as TryStream>::Ok) -> Fut,
Fut: TryFuture<Ok = Option<T>, Error = <St as TryStream>::Error>,
St: TryStream,
impl<St, Fut, F, T> Stream for TryFilterMap<St, Fut, F> where
F: FnMut(<St as TryStream>::Ok) -> Fut,
Fut: TryFuture<Ok = Option<T>, Error = <St as TryStream>::Error>,
St: TryStream,
impl<T> Stream for Empty<T>
impl<T> Stream for Empty<T>
impl<St, Fut, F> Stream for OrElse<St, Fut, F> where
F: FnMut(<St as TryStream>::Error) -> Fut,
Fut: TryFuture<Ok = <St as TryStream>::Ok>,
St: TryStream,
impl<St, Fut, F> Stream for OrElse<St, Fut, F> where
F: FnMut(<St as TryStream>::Error) -> Fut,
Fut: TryFuture<Ok = <St as TryStream>::Ok>,
St: TryStream,
impl<St1, St2> Stream for Select<St1, St2> where
St1: Stream,
St2: Stream<Item = <St1 as Stream>::Item>,
impl<St1, St2> Stream for Select<St1, St2> where
St1: Stream,
St2: Stream<Item = <St1 as Stream>::Item>,
impl<St, Fut, F> Stream for TakeWhile<St, Fut, F> where
F: FnMut(&<St as Stream>::Item) -> Fut,
Fut: Future<Output = bool>,
St: Stream,
impl<St, Fut, F> Stream for TakeWhile<St, Fut, F> where
F: FnMut(&<St as Stream>::Item) -> Fut,
Fut: Future<Output = bool>,
St: Stream,
impl<St, Fut, F> Stream for AndThen<St, Fut, F> where
F: FnMut(<St as TryStream>::Ok) -> Fut,
Fut: TryFuture<Error = <St as TryStream>::Error>,
St: TryStream,
impl<St, Fut, F> Stream for AndThen<St, Fut, F> where
F: FnMut(<St as TryStream>::Ok) -> Fut,
Fut: TryFuture<Error = <St as TryStream>::Error>,
St: TryStream,
impl<St, Fut, F> Stream for TryFilter<St, Fut, F> where
F: FnMut(&<St as TryStream>::Ok) -> Fut,
Fut: Future<Output = bool>,
St: TryStream,
impl<St, Fut, F> Stream for TryFilter<St, Fut, F> where
F: FnMut(&<St as TryStream>::Ok) -> Fut,
Fut: Future<Output = bool>,
St: TryStream,
impl<St> Stream for TryBufferUnordered<St> where
St: TryStream,
<St as TryStream>::Ok: TryFuture,
<<St as TryStream>::Ok as TryFuture>::Error == <St as TryStream>::Error,
impl<St> Stream for TryBufferUnordered<St> where
St: TryStream,
<St as TryStream>::Ok: TryFuture,
<<St as TryStream>::Ok as TryFuture>::Error == <St as TryStream>::Error,
impl<St, Fut, F> Stream for TryTakeWhile<St, Fut, F> where
F: FnMut(&<St as TryStream>::Ok) -> Fut,
Fut: TryFuture<Ok = bool, Error = <St as TryStream>::Error>,
St: TryStream,
impl<St, Fut, F> Stream for TryTakeWhile<St, Fut, F> where
F: FnMut(&<St as TryStream>::Ok) -> Fut,
Fut: TryFuture<Ok = bool, Error = <St as TryStream>::Error>,
St: TryStream,
impl<T> Stream for UnboundedReceiver<T>
impl<T> Stream for UnboundedReceiver<T>
impl<T> Stream for Receiver<T>
impl<T> Stream for Receiver<T>
impl Stream for PollSemaphore
impl Stream for PollSemaphore
type Item = OwnedSemaphorePermit
pub fn poll_next(
self: Pin<&mut PollSemaphore>,
cx: &mut Context<'_>
) -> Poll<Option<OwnedSemaphorePermit>>
self: Pin<&mut PollSemaphore>,
cx: &mut Context<'_>
) -> Poll<Option<OwnedSemaphorePermit>>
Implementors
impl Stream for ClientResponse
[src]
impl Stream for ClientResponse
[src]impl<B: MessageBody + Unpin> Stream for ResponseBody<B>
[src]
impl<B: MessageBody + Unpin> Stream for ResponseBody<B>
[src]