[][src]Struct futures::future::OptionFuture

#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct OptionFuture<F> { /* fields omitted */ }

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

Created by the From implementation for Option.


use futures::future::{self, OptionFuture};

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

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

Trait Implementations

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

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

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

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

The type of value produced on completion.

impl<T> From<Option<T>> for OptionFuture<T>[src]

Auto Trait Implementations

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

impl<F> Unpin for OptionFuture<F> where
    F: Unpin

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

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

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

Blanket Implementations

impl<T> ToOwned for T where
    T: Clone

type Owned = T

The resulting type after obtaining ownership.

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

impl<T> From<T> for T[src]

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

type Error = Infallible

The type returned in the event of a conversion error.

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

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

The type returned in the event of a conversion error.

impl<T> BorrowMut<T> for T where
    T: ?Sized

impl<T> Borrow<T> for T where
    T: ?Sized

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

impl<T> FutureExt for T where
    T: Future + ?Sized