pub struct OptionFuture<F> { /* private fields */ }
Expand description

A future representing a value which may or may not be present.

Created by the From implementation for Option.

Examples

use futures::future::OptionFuture;

let mut a: OptionFuture<_> = Some(async { 123 }).into();
assert_eq!(a.await, Some(123));

a = None.into();
assert_eq!(a.await, None);

Trait Implementations§

source§

impl<F: Clone> Clone for OptionFuture<F>

source§

fn clone(&self) -> OptionFuture<F>

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
source§

impl<F: Debug> Debug for OptionFuture<F>

source§

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

Formats the value using the given formatter. Read more
source§

impl<F> Default for OptionFuture<F>

source§

fn default() -> Self

Returns the “default value” for a type. Read more
source§

impl<T> From<Option<T>> for OptionFuture<T>

source§

fn from(option: Option<T>) -> Self

Converts to this type from the input type.
source§

impl<F: FusedFuture> FusedFuture for OptionFuture<F>

source§

fn is_terminated(&self) -> bool

Returns true if the underlying future should no longer be polled.
source§

impl<F: Future> Future for OptionFuture<F>

§

type Output = Option<<F as Future>::Output>

The type of value produced on completion.
source§

fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>

Attempt to resolve the future to a final value, registering the current task for wakeup if the value is not yet available. Read more
source§

impl<'__pin, F> Unpin for OptionFuture<F>where __Origin<'__pin, F>: Unpin,

Auto Trait Implementations§

§

impl<F> RefUnwindSafe for OptionFuture<F>where F: RefUnwindSafe,

§

impl<F> Send for OptionFuture<F>where F: Send,

§

impl<F> Sync for OptionFuture<F>where F: Sync,

§

impl<F> UnwindSafe for OptionFuture<F>where F: UnwindSafe,

Blanket Implementations§

source§

impl<T> Any for Twhere T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for Twhere T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T> FutureExt for Twhere T: Future + ?Sized,

source§

fn map<U, F>(self, f: F) -> Map<Self, F> where F: FnOnce(Self::Output) -> U, Self: Sized,

Map this future’s output to a different type, returning a new future of the resulting type. Read more
source§

fn map_into<U>(self) -> MapInto<Self, U> where Self::Output: Into<U>, Self: Sized,

Map this future’s output to a different type, returning a new future of the resulting type. Read more
source§

fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where F: FnOnce(Self::Output) -> Fut, Fut: Future, Self: Sized,

Chain on a computation for when a future finished, passing the result of the future to the provided closure f. Read more
source§

fn left_future<B>(self) -> Either<Self, B> where B: Future<Output = Self::Output>, Self: Sized,

Wrap this future in an Either future, making it the left-hand variant of that Either. Read more
source§

fn right_future<A>(self) -> Either<A, Self> where A: Future<Output = Self::Output>, Self: Sized,

Wrap this future in an Either future, making it the right-hand variant of that Either. Read more
source§

fn into_stream(self) -> IntoStream<Self>where Self: Sized,

Convert this future into a single element stream. Read more
source§

fn flatten(self) -> Flatten<Self> where Self::Output: Future, Self: Sized,

Flatten the execution of this future when the output of this future is itself another future. Read more
source§

fn flatten_stream(self) -> FlattenStream<Self>where Self::Output: Stream, Self: Sized,

Flatten the execution of this future when the successful result of this future is a stream. Read more
source§

fn fuse(self) -> Fuse<Self> where Self: Sized,

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
source§

fn inspect<F>(self, f: F) -> Inspect<Self, F> where F: FnOnce(&Self::Output), Self: Sized,

Do something with the output of a future before passing it on. Read more
source§

fn catch_unwind(self) -> CatchUnwind<Self> where Self: Sized + UnwindSafe,

Catches unwinding panics while polling the future. Read more
source§

fn shared(self) -> Shared<Self> where Self: Sized, Self::Output: Clone,

Create a cloneable handle to this future where all handles will resolve to the same result. Read more
source§

fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)where Self: Sized,

Turn this future into a future that yields () on completion and sends its output to another future on a separate task. Read more
source§

fn boxed<'a>(self) -> BoxFuture<'a, Self::Output>where Self: Sized + Send + 'a,

Wrap the future in a Box, pinning it. Read more
source§

fn boxed_local<'a>(self) -> LocalBoxFuture<'a, Self::Output>where Self: Sized + 'a,

Wrap the future in a Box, pinning it. Read more
source§

fn unit_error(self) -> UnitError<Self> where Self: Sized,

source§

fn never_error(self) -> NeverError<Self> where Self: Sized,

source§

fn poll_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Self::Output>where Self: Unpin,

A convenience for calling Future::poll on Unpin future types.
source§

fn now_or_never(self) -> Option<Self::Output>where Self: Sized,

Evaluates and consumes the future, returning the resulting output if the future is ready after the first call to Future::poll. Read more
source§

impl<T, U> Into<U> for Twhere U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<F> IntoFuture for Fwhere F: Future,

§

type Output = <F as Future>::Output

The output that the future will produce on completion.
§

type IntoFuture = F

Which kind of future are we turning this into?
source§

fn into_future(self) -> <F as IntoFuture>::IntoFuture

Creates a future from a value. Read more
source§

impl<T> ToOwned for Twhere T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.