[−][src]Struct futures::future::FutureObj
A custom trait object for polling futures, roughly akin to
Box<dyn Future<Output = T> + Send + 'a>.
This custom trait object was introduced for two reasons:
- Currently it is not possible to take
dyn Traitby value andBox<dyn Trait>is not available in no_std contexts. - The
Futuretrait is currently not object safe: TheFuture::pollmethod makes uses the arbitrary self types feature and traits in which this feature is used are currently not object safe due to current compiler limitations. (See tracking issue for arbitrary self types for more information #44874)
Methods
impl<'a, T> FutureObj<'a, T>[src]
ⓘImportant traits for FutureObj<'a, T>pub fn new<F>(f: F) -> FutureObj<'a, T> where
F: UnsafeFutureObj<'a, T> + Send, [src]
F: UnsafeFutureObj<'a, T> + Send,
Create a FutureObj from a custom trait object representation.
Trait Implementations
impl<'a, T> Unpin for FutureObj<'a, T>[src]
impl<'a, F> From<Pin<Box<F>>> for FutureObj<'a, ()> where
F: 'a + Send + Future<Output = ()>, [src]
F: 'a + Send + Future<Output = ()>,
impl<'a, T> From<FutureObj<'a, T>> for LocalFutureObj<'a, T>[src]
ⓘImportant traits for LocalFutureObj<'a, T>fn from(f: FutureObj<'a, T>) -> LocalFutureObj<'a, T>[src]
impl<'a, F> From<Box<F>> for FutureObj<'a, ()> where
F: 'a + Send + Future<Output = ()>, [src]
F: 'a + Send + Future<Output = ()>,
impl<'a, T> Future for FutureObj<'a, T>[src]
type Output = T
🔬 This is a nightly-only experimental API. (futures_api)
futures in libcore are unstable
The type of value produced on completion.
fn poll(self: Pin<&mut FutureObj<'a, T>>, cx: &mut Context) -> Poll<T>[src]
impl<'a, T> Send for FutureObj<'a, T>[src]
impl<'a, T> Debug for FutureObj<'a, T>[src]
Auto Trait Implementations
Blanket Implementations
impl<T, U> Into for T where
U: From<T>, [src]
U: From<T>,
impl<T> From for T[src]
impl<T, U> TryFrom 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> Borrow for T where
T: ?Sized, [src]
T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized, [src]
T: 'static + ?Sized,
impl<T> BorrowMut for T where
T: ?Sized, [src]
T: ?Sized,
ⓘImportant traits for &'_ mut Ffn borrow_mut(&mut self) -> &mut T[src]
impl<T, U> TryInto 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> FutureExt for T where
T: Future + ?Sized, [src]
T: Future + ?Sized,
ⓘImportant traits for Map<Fut, F>fn map<U, F>(self, f: F) -> Map<Self, F> where
F: FnOnce(Self::Output) -> U, [src]
F: FnOnce(Self::Output) -> U,
Map this future's output to a different type, returning a new future of the resulting type. Read more
ⓘImportant traits for Then<Fut1, Fut2, F>fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
F: FnOnce(Self::Output) -> Fut,
Fut: Future, [src]
F: FnOnce(Self::Output) -> Fut,
Fut: Future,
Chain on a computation for when a future finished, passing the result of the future to the provided closure f. Read more
fn into_stream(self) -> IntoStream<Self>[src]
Convert this future into a single element stream. Read more
ⓘImportant traits for Flatten<Fut>fn flatten(self) -> Flatten<Self> where
Self::Output: Future, [src]
Self::Output: Future,
Flatten the execution of this future when the successful result of this future is itself another future. Read more
fn flatten_stream(self) -> FlattenStream<Self> where
Self::Output: Stream, [src]
Self::Output: Stream,
Flatten the execution of this future when the successful result of this future is a stream. Read more
ⓘImportant traits for Fuse<Fut>fn fuse(self) -> Fuse<Self>[src]
Fuse a future such that poll will never again be called once it has completed. This method can be used to turn any Future into a FusedFuture. Read more
ⓘImportant traits for Inspect<Fut, F>fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnOnce(&Self::Output), [src]
F: FnOnce(&Self::Output),
Do something with the output of a future before passing it on. Read more
ⓘImportant traits for CatchUnwind<Fut>fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe, [src]
Self: UnwindSafe,
Catches unwinding panics while polling the future. Read more
ⓘImportant traits for Shared<Fut>fn shared(self) -> Shared<Self> where
Self::Output: Clone, [src]
Self::Output: Clone,
Create a cloneable handle to this future where all handles will resolve to the same result. Read more
fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)[src]
Turn this future into a future that yields () on completion and sends its output to another future on a separate task. Read more
ⓘImportant traits for Pin<P>fn boxed(self) -> Pin<Box<Self>>[src]
Wrap the future in a Box, pinning it.
ⓘImportant traits for UnitError<Fut>fn unit_error(self) -> UnitError<Self>[src]
Turns a Future into a TryFuture with Error = ().
fn poll_unpin(&mut self, cx: &mut Context) -> Poll<Self::Output> where
Self: Unpin, [src]
Self: Unpin,
A convenience for calling Future::poll on Unpin future types.
impl<F, T, E> TryFuture for F where
F: Future<Output = Result<T, E>>, [src]
F: Future<Output = Result<T, E>>,
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(self: Pin<&mut F>, cx: &mut Context) -> Poll<<F as Future>::Output>[src]
impl<Fut> TryFutureExt for Fut where
Fut: TryFuture, [src]
Fut: TryFuture,
fn flatten_sink<Item>(self) -> FlattenSink<Self, Self::Ok> where
Self::Ok: Sink<Item>,
<Self::Ok as Sink<Item>>::SinkError == Self::Error, [src]
Self::Ok: Sink<Item>,
<Self::Ok as Sink<Item>>::SinkError == Self::Error,
Flattens the execution of this future when the successful result of this future is a [Sink]. Read more
ⓘImportant traits for MapOk<Fut, F>fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where
F: FnOnce(Self::Ok) -> T, [src]
F: FnOnce(Self::Ok) -> T,
Maps this future's success value to a different value. Read more
ⓘImportant traits for MapErr<Fut, F>fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where
F: FnOnce(Self::Error) -> E, [src]
F: FnOnce(Self::Error) -> E,
Maps this future's error value to a different value. Read more
ⓘImportant traits for ErrInto<Fut, E>fn err_into<E>(self) -> ErrInto<Self, E> where
Self::Error: Into<E>, [src]
Self::Error: Into<E>,
Maps this future's Error to a new error type using the Into trait. Read more
ⓘImportant traits for AndThen<Fut1, Fut2, F>fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where
F: FnOnce(Self::Ok) -> Fut,
Fut: TryFuture<Error = Self::Error>, [src]
F: FnOnce(Self::Ok) -> Fut,
Fut: TryFuture<Error = Self::Error>,
Executes another future after this one resolves successfully. The success value is passed to a closure to create this subsequent future. Read more
ⓘImportant traits for OrElse<Fut1, Fut2, F>fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F> where
F: FnOnce(Self::Error) -> Fut,
Fut: TryFuture<Ok = Self::Ok>, [src]
F: FnOnce(Self::Error) -> Fut,
Fut: TryFuture<Ok = Self::Ok>,
Executes another future if this one resolves to an error. The error value is passed to a closure to create this subsequent future. Read more
ⓘImportant traits for UnwrapOrElse<Fut, F>fn unwrap_or_else<F>(self, f: F) -> UnwrapOrElse<Self, F> where
F: FnOnce(Self::Error) -> Self::Ok, [src]
F: FnOnce(Self::Error) -> Self::Ok,
Unwraps this future's ouput, producing a future with this future's Ok type as its Output type. Read more
ⓘImportant traits for IntoFuture<Fut>fn into_future(self) -> IntoFuture<Self>[src]
Wraps a [TryFuture] into a type that implements Future. Read more