[−][src]Enum futures::future::MaybeDone
A future that may have completed.
This is created by the maybe_done()
function.
Variants
A not-yet-completed future
The output of the completed future
The empty variant after the result of a MaybeDone
has been
taken using the take_output
method.
Implementations
impl<Fut> MaybeDone<Fut> where
Fut: Future,
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Fut: Future,
pub fn output_mut(
self: Pin<&mut MaybeDone<Fut>>
) -> Option<&mut <Fut as Future>::Output>
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self: Pin<&mut MaybeDone<Fut>>
) -> Option<&mut <Fut as Future>::Output>
Returns an Option
containing a mutable reference to the output of the future.
The output of this method will be Some
if and only if the inner
future has been completed and take_output
has not yet been called.
pub fn take_output(
self: Pin<&mut MaybeDone<Fut>>
) -> Option<<Fut as Future>::Output>
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self: Pin<&mut MaybeDone<Fut>>
) -> Option<<Fut as Future>::Output>
Attempt to take the output of a MaybeDone
without driving it
towards completion.
Trait Implementations
impl<Fut> Debug for MaybeDone<Fut> where
Fut: Debug + Future,
<Fut as Future>::Output: Debug,
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Fut: Debug + Future,
<Fut as Future>::Output: Debug,
impl<Fut> FusedFuture for MaybeDone<Fut> where
Fut: Future,
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Fut: Future,
impl<Fut> Future for MaybeDone<Fut> where
Fut: Future,
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Fut: Future,
impl<'pin, Fut> Unpin for MaybeDone<Fut> where
Fut: Future,
__MaybeDone<'pin, Fut>: Unpin,
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Fut: Future,
__MaybeDone<'pin, Fut>: Unpin,
impl<Fut> UnsafeUnpin for MaybeDone<Fut> where
Fut: Future,
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Fut: Future,
Auto Trait Implementations
impl<Fut> RefUnwindSafe for MaybeDone<Fut> where
Fut: RefUnwindSafe,
<Fut as Future>::Output: RefUnwindSafe,
Fut: RefUnwindSafe,
<Fut as Future>::Output: RefUnwindSafe,
impl<Fut> Send for MaybeDone<Fut> where
Fut: Send,
<Fut as Future>::Output: Send,
Fut: Send,
<Fut as Future>::Output: Send,
impl<Fut> Sync for MaybeDone<Fut> where
Fut: Sync,
<Fut as Future>::Output: Sync,
Fut: Sync,
<Fut as Future>::Output: Sync,
impl<Fut> UnwindSafe for MaybeDone<Fut> where
Fut: UnwindSafe,
<Fut as Future>::Output: UnwindSafe,
Fut: UnwindSafe,
<Fut as Future>::Output: 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,
impl<T> From<T> for T
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impl<T> FutureExt for T where
T: Future + ?Sized,
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T: Future + ?Sized,
impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,