[−][src]Struct tokio_sync::watch::Receiver
Receives values from the associated Sender.
Instances are created by the channel function.
Methods
impl<T> Receiver<T>[src]
pub fn get_ref(&self) -> Ref<T>[src]
Returns a reference to the most recently sent value
Outstanding borrows hold a read lock. This means that long lived borrows could cause the send half to block. It is recommended to keep the borrow as short lived as possible.
Examples
use tokio::sync::watch; let (_, rx) = watch::channel("hello"); assert_eq!(*rx.get_ref(), "hello");
pub async fn recv_ref<'_, '_>(&'_ mut self) -> Option<Ref<'_, T>>[src]
Attempts to receive the latest value sent via the channel.
If a new, unobserved, value has been sent, a reference to it is
returned. If no new value has been sent, then Pending is returned and
the current task is notified once a new value is sent.
Only the most recent value is returned. If the receiver is falling behind the sender, intermediate values are dropped.
impl<T: Clone> Receiver<T>[src]
pub async fn recv<'_>(&'_ mut self) -> Option<T>[src]
Attempts to clone the latest value sent via the channel.
This is equivalent to calling clone() on the value returned by
recv().
Trait Implementations
impl<T> Drop for Receiver<T>[src]
impl<T> Clone for Receiver<T>[src]
fn clone(&self) -> Self[src]
fn clone_from(&mut self, source: &Self)1.0.0[src]
impl<T: Debug> Debug for Receiver<T>[src]
impl<T: Clone> Stream for Receiver<T>[src]
Auto Trait Implementations
impl<T> Send for Receiver<T> where
T: Send + Sync,
T: Send + Sync,
impl<T> Unpin for Receiver<T>
impl<T> Sync for Receiver<T> where
T: Send + Sync,
T: Send + Sync,
impl<T> !UnwindSafe for Receiver<T>
impl<T> !RefUnwindSafe for Receiver<T>
Blanket Implementations
impl<T> ToOwned for T where
T: Clone, [src]
T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T[src]
fn clone_into(&self, target: &mut T)[src]
impl<T, U> Into<U> for T where
U: From<T>, [src]
U: From<T>,
impl<T> From<T> for T[src]
impl<T, U> TryFrom<U> for T where
U: Into<T>, [src]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>, [src]
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]
impl<T> BorrowMut<T> for T where
T: ?Sized, [src]
T: ?Sized,
fn borrow_mut(&mut self) -> &mut T[src]
impl<T> Borrow<T> for T where
T: ?Sized, [src]
T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized, [src]
T: 'static + ?Sized,
impl<T> StreamExt for T where
T: Stream + ?Sized, [src]
T: Stream + ?Sized,
fn next(&mut self) -> Next<Self> where
Self: Unpin, [src]
Self: Unpin,
fn into_future(self) -> StreamFuture<Self> where
Self: Unpin, [src]
Self: Unpin,
fn map<T, F>(self, f: F) -> Map<Self, F> where
F: FnMut(Self::Item) -> T, [src]
F: FnMut(Self::Item) -> T,
fn enumerate(self) -> Enumerate<Self>[src]
fn filter<Fut, F>(self, f: F) -> Filter<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>, [src]
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,
fn filter_map<Fut, T, F>(self, f: F) -> FilterMap<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = Option<T>>, [src]
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = Option<T>>,
fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future, [src]
F: FnMut(Self::Item) -> Fut,
Fut: Future,
fn collect<C>(self) -> Collect<Self, C> where
C: Default + Extend<Self::Item>, [src]
C: Default + Extend<Self::Item>,
fn concat(self) -> Concat<Self> where
Self::Item: Extend<<Self::Item as IntoIterator>::Item>,
Self::Item: IntoIterator,
Self::Item: Default, [src]
Self::Item: Extend<<Self::Item as IntoIterator>::Item>,
Self::Item: IntoIterator,
Self::Item: Default,
fn fold<T, Fut, F>(self, init: T, f: F) -> Fold<Self, Fut, T, F> where
F: FnMut(T, Self::Item) -> Fut,
Fut: Future<Output = T>, [src]
F: FnMut(T, Self::Item) -> Fut,
Fut: Future<Output = T>,
fn flatten(self) -> Flatten<Self> where
Self::Item: Stream, [src]
Self::Item: Stream,
fn skip_while<Fut, F>(self, f: F) -> SkipWhile<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>, [src]
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,
fn take_while<Fut, F>(self, f: F) -> TakeWhile<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>, [src]
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,
fn for_each<Fut, F>(self, f: F) -> ForEach<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = ()>, [src]
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = ()>,
fn for_each_concurrent<Fut, F>(
self,
limit: impl Into<Option<usize>>,
f: F
) -> ForEachConcurrent<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = ()>, [src]
self,
limit: impl Into<Option<usize>>,
f: F
) -> ForEachConcurrent<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = ()>,
fn take(self, n: u64) -> Take<Self>[src]
fn skip(self, n: u64) -> Skip<Self>[src]
fn fuse(self) -> Fuse<Self>[src]
fn by_ref(&mut self) -> &mut Self[src]
fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe, [src]
Self: UnwindSafe,
fn boxed<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a + Send>> where
Self: Send + 'a, [src]
Self: Send + 'a,
fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a>> where
Self: 'a, [src]
Self: 'a,
fn buffered(self, n: usize) -> Buffered<Self> where
Self::Item: Future, [src]
Self::Item: Future,
fn buffer_unordered(self, n: usize) -> BufferUnordered<Self> where
Self::Item: Future, [src]
Self::Item: Future,
fn zip<St>(self, other: St) -> Zip<Self, St> where
St: Stream, [src]
St: Stream,
fn chain<St>(self, other: St) -> Chain<Self, St> where
St: Stream<Item = Self::Item>, [src]
St: Stream<Item = Self::Item>,
fn peekable(self) -> Peekable<Self>[src]
fn chunks(self, capacity: usize) -> Chunks<Self>[src]
fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnMut(&Self::Item), [src]
F: FnMut(&Self::Item),
fn left_stream<B>(self) -> Either<Self, B> where
B: Stream<Item = Self::Item>, [src]
B: Stream<Item = Self::Item>,
fn right_stream<B>(self) -> Either<B, Self> where
B: Stream<Item = Self::Item>, [src]
B: Stream<Item = Self::Item>,
fn poll_next_unpin(&mut self, cx: &mut Context) -> Poll<Option<Self::Item>> where
Self: Unpin, [src]
Self: Unpin,
fn select_next_some(&mut self) -> SelectNextSome<Self> where
Self: Unpin + FusedStream, [src]
Self: Unpin + FusedStream,
impl<S, T, E> TryStream for S where
S: Stream<Item = Result<T, E>> + ?Sized, [src]
S: Stream<Item = Result<T, E>> + ?Sized,
type Ok = T
The type of successful values yielded by this future
type Error = E
The type of failures yielded by this future
fn try_poll_next(
self: Pin<&mut S>,
cx: &mut Context
) -> Poll<Option<Result<<S as TryStream>::Ok, <S as TryStream>::Error>>>[src]
self: Pin<&mut S>,
cx: &mut Context
) -> Poll<Option<Result<<S as TryStream>::Ok, <S as TryStream>::Error>>>
impl<S> TryStreamExt for S where
S: TryStream + ?Sized, [src]
S: TryStream + ?Sized,
fn err_into<E>(self) -> ErrInto<Self, E> where
Self::Error: Into<E>, [src]
Self::Error: Into<E>,
fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where
F: FnMut(Self::Ok) -> T, [src]
F: FnMut(Self::Ok) -> T,
fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where
F: FnMut(Self::Error) -> E, [src]
F: FnMut(Self::Error) -> E,
fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where
F: FnMut(Self::Ok) -> Fut,
Fut: TryFuture<Error = Self::Error>, [src]
F: FnMut(Self::Ok) -> Fut,
Fut: TryFuture<Error = Self::Error>,
fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F> where
F: FnMut(Self::Error) -> Fut,
Fut: TryFuture<Ok = Self::Ok>, [src]
F: FnMut(Self::Error) -> Fut,
Fut: TryFuture<Ok = Self::Ok>,
fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F> where
F: FnMut(&Self::Ok), [src]
F: FnMut(&Self::Ok),
fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where
F: FnMut(&Self::Error), [src]
F: FnMut(&Self::Error),
fn into_stream(self) -> IntoStream<Self>[src]
fn try_next(&mut self) -> TryNext<Self> where
Self: Unpin, [src]
Self: Unpin,
fn try_for_each<Fut, F>(self, f: F) -> TryForEach<Self, Fut, F> where
F: FnMut(Self::Ok) -> Fut,
Fut: TryFuture<Ok = (), Error = Self::Error>, [src]
F: FnMut(Self::Ok) -> Fut,
Fut: TryFuture<Ok = (), Error = Self::Error>,
fn try_skip_while<Fut, F>(self, f: F) -> TrySkipWhile<Self, Fut, F> where
F: FnMut(&Self::Ok) -> Fut,
Fut: TryFuture<Ok = bool, Error = Self::Error>, [src]
F: FnMut(&Self::Ok) -> Fut,
Fut: TryFuture<Ok = bool, Error = Self::Error>,
fn try_for_each_concurrent<Fut, F>(
self,
limit: impl Into<Option<usize>>,
f: F
) -> TryForEachConcurrent<Self, Fut, F> where
F: FnMut(Self::Ok) -> Fut,
Fut: Future<Output = Result<(), Self::Error>>, [src]
self,
limit: impl Into<Option<usize>>,
f: F
) -> TryForEachConcurrent<Self, Fut, F> where
F: FnMut(Self::Ok) -> Fut,
Fut: Future<Output = Result<(), Self::Error>>,
fn try_collect<C>(self) -> TryCollect<Self, C> where
C: Default + Extend<Self::Ok>, [src]
C: Default + Extend<Self::Ok>,
fn try_filter<Fut, F>(self, f: F) -> TryFilter<Self, Fut, F> where
F: FnMut(&Self::Ok) -> Fut,
Fut: Future<Output = bool>, [src]
F: FnMut(&Self::Ok) -> Fut,
Fut: Future<Output = bool>,
fn try_filter_map<Fut, F, T>(self, f: F) -> TryFilterMap<Self, Fut, F> where
F: FnMut(Self::Ok) -> Fut,
Fut: TryFuture<Ok = Option<T>, Error = Self::Error>, [src]
F: FnMut(Self::Ok) -> Fut,
Fut: TryFuture<Ok = Option<T>, Error = Self::Error>,
fn try_flatten(self) -> TryFlatten<Self> where
Self::Ok: TryStream,
<Self::Ok as TryStream>::Error: From<Self::Error>, [src]
Self::Ok: TryStream,
<Self::Ok as TryStream>::Error: From<Self::Error>,
fn try_fold<T, Fut, F>(self, init: T, f: F) -> TryFold<Self, Fut, T, F> where
F: FnMut(T, Self::Ok) -> Fut,
Fut: TryFuture<Ok = T, Error = Self::Error>, [src]
F: FnMut(T, Self::Ok) -> Fut,
Fut: TryFuture<Ok = T, Error = Self::Error>,
fn try_concat(self) -> TryConcat<Self> where
Self::Ok: Extend<<Self::Ok as IntoIterator>::Item>,
Self::Ok: IntoIterator,
Self::Ok: Default, [src]
Self::Ok: Extend<<Self::Ok as IntoIterator>::Item>,
Self::Ok: IntoIterator,
Self::Ok: Default,
fn try_buffer_unordered(self, n: usize) -> TryBufferUnordered<Self> where
Self::Ok: TryFuture,
<Self::Ok as TryFuture>::Error == Self::Error, [src]
Self::Ok: TryFuture,
<Self::Ok as TryFuture>::Error == Self::Error,
fn try_poll_next_unpin(
&mut self,
cx: &mut Context
) -> Poll<Option<Result<Self::Ok, Self::Error>>> where
Self: Unpin, [src]
&mut self,
cx: &mut Context
) -> Poll<Option<Result<Self::Ok, Self::Error>>> where
Self: Unpin,