Enum MaybeDone
pub enum MaybeDone<Fut: Future>A future that may have completed.
This is created by the [maybe_done()] function.
Variants
-
Future(Fut) A not-yet-completed future
-
Done(Fut::Output) The output of the completed future
-
Gone The empty variant after the result of a
MaybeDonehas been taken using thetake_outputmethod.
Implementations
impl<Fut: Future> MaybeDone<Fut>
fn output_mut(self: Pin<&mut Self>) -> Option<&mut Fut::Output>Returns an
Optioncontaining a mutable reference to the output of the future. The output of this method will beSomeif and only if the inner future has been completed andtake_outputhas not yet been called.fn take_output(self: Pin<&mut Self>) -> Option<Fut::Output>Attempt to take the output of a
MaybeDonewithout driving it towards completion.
Trait Implementations
impl<Fut: Debug + Future> Debug for MaybeDone<Fut>
where
Fut::Output: Debug,
fn fmt(&self, f: &mut Formatter<'_>) -> Result
impl<Fut: Future + Unpin> Unpin for MaybeDone<Fut>
impl<Fut: Future> FusedFuture for MaybeDone<Fut>
fn is_terminated(&self) -> bool
impl<Fut: Future> Future for MaybeDone<Fut>
type Output = ();fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>
Auto Trait Implementations
impl<Fut> Freeze for MaybeDone<Fut>
where
Fut: Freeze,
<Fut as Future>::Output: Freeze,
impl<Fut> RefUnwindSafe for MaybeDone<Fut>
where
Fut: RefUnwindSafe,
<Fut as Future>::Output: RefUnwindSafe,
impl<Fut> Send for MaybeDone<Fut>
where
Fut: Send,
<Fut as Future>::Output: Send,
impl<Fut> Sync for MaybeDone<Fut>
where
Fut: Sync,
<Fut as Future>::Output: Sync,
impl<Fut> UnsafeUnpin for MaybeDone<Fut>
where
Fut: UnsafeUnpin,
<Fut as Future>::Output: UnsafeUnpin,
impl<Fut> UnwindSafe for MaybeDone<Fut>
where
Fut: UnwindSafe,
<Fut as Future>::Output: UnwindSafe,
Blanket Implementations
impl<F> IntoFuture for MaybeDone<Fut>
where
F: Future,
type Output = <F as Future>::Output;type IntoFuture = F;fn into_future(self) -> <F as IntoFuture>::IntoFuture
impl<T> Any for MaybeDone<Fut>
where
T: 'static + ?Sized,
fn type_id(&self) -> TypeId
impl<T> Borrow<T> for MaybeDone<Fut>
where
T: ?Sized,
fn borrow(&self) -> &T
impl<T> BorrowMut<T> for MaybeDone<Fut>
where
T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
impl<T> From<T> for MaybeDone<Fut>
fn from(t: T) -> TReturns the argument unchanged.
impl<T> FutureExt for MaybeDone<Fut>
where
T: Future + ?Sized,
impl<T, U> Into<U> for MaybeDone<Fut>
where
U: From<T>,
fn into(self) -> UCalls
U::from(self).That is, this conversion is whatever the implementation of
[From]<T> for Uchooses to do.
impl<T, U> TryFrom<U> for MaybeDone<Fut>
where
U: Into<T>,
type Error = never;fn try_from(value: U) -> Result<T, never>
impl<T, U> TryInto<U> for MaybeDone<Fut>
where
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error;fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>