[−][src]Enum futures::future::MaybeDone

pub enum MaybeDone<Fut> where
    Fut: Future,  {
    Future(Fut),
    Done(<Fut as Future>::Output),
    Gone,
}
[−]

A future that may have completed.

This is created by the maybe_done() function.

Variants

Future(Fut)
[−]

A not-yet-completed future

Done(<Fut as Future>::Output)
[−]

The output of the completed future

Gone
[−]

The empty variant after the result of a MaybeDone has been taken using the take_output method.

Methods

impl<Fut> MaybeDone<Fut> where
    Fut: Future, [src][−]

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.

Attempt to take the output of a MaybeDone without driving it towards completion.

Trait Implementations

impl<Fut> Unpin for MaybeDone<Fut> where
    Fut: Unpin + Future, [src]

impl<Fut> FusedFuture for MaybeDone<Fut> where
    Fut: Future, [src][+]

impl<Fut> Debug for MaybeDone<Fut> where
    Fut: Debug + Future,
    <Fut as Future>::Output: Debug, [src][+]

impl<Fut> Future for MaybeDone<Fut> where
    Fut: Future, [src][+]

type Output = ()

The type of value produced on completion.

Auto Trait Implementations

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, 

Blanket Implementations

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

impl<T, U> Into for T where
    U: From<T>, [src][+]

impl<T, U> TryFrom for T where
    U: Into<T>, [src][+]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized, [src][+]

impl<T> Any for T where
    T: 'static + ?Sized, [src][+]

impl<T> BorrowMut for T where
    T: ?Sized, [src][+]

impl<T, U> TryInto for T where
    U: TryFrom<T>, [src][+]

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

The type returned in the event of a conversion error.

impl<T> FutureExt for T where
    T: Future + ?Sized, [src][+]

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

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

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

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

Convert this future into a single element stream. Read more

Flatten the execution of this future when the successful result of this future is itself another future. Read more

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

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

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

Catches unwinding panics while polling the future. Read more

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

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

Wrap the future in a Box, pinning it.

Turns a Future<Output = T> into a TryFuture<Ok = T, Error = ()>. Read more

Turns a Future<Output = T> into a TryFuture<Ok = T, Error = !>. Read more

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