[−][src]Struct futures_util::future::OptionFuture
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
impl<F: Clone> Clone for OptionFuture<F>
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fn clone(&self) -> OptionFuture<F>ⓘNotable traits for OptionFuture<F>
impl<F: Future> Future for OptionFuture<F> type Output = Option<F::Output>;
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Notable traits for OptionFuture<F>
impl<F: Future> Future for OptionFuture<F> type Output = Option<F::Output>;
fn clone_from(&mut self, source: &Self)
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impl<F: Debug> Debug for OptionFuture<F>
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impl<T> From<Option<T>> for OptionFuture<T>
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impl<F: FusedFuture> FusedFuture for OptionFuture<F>
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fn is_terminated(&self) -> bool
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impl<F: Future> Future for OptionFuture<F>
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type Output = Option<F::Output>
The type of value produced on completion.
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>
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impl<F> PinnedDrop for OptionFuture<F>
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impl<'pin, F> Unpin for OptionFuture<F> where
__OptionFuture<'pin, F>: Unpin,
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__OptionFuture<'pin, F>: Unpin,
impl<F> UnsafeUnpin for OptionFuture<F>
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Auto Trait Implementations
impl<F> RefUnwindSafe for OptionFuture<F> where
F: RefUnwindSafe,
F: RefUnwindSafe,
impl<F> Send for OptionFuture<F> where
F: Send,
F: Send,
impl<F> Sync for OptionFuture<F> where
F: Sync,
F: Sync,
impl<F> UnwindSafe for OptionFuture<F> where
F: UnwindSafe,
F: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut Tⓘ
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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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>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,