Enum DoneFuture 

pub enum DoneFuture {
    Ready,
    Wait(Pin<Box<dyn Future<Output = ()> + Send + 'static>>),
    Never,
}

Done() 的异步版 Future。

Variants

Ready

Wait(Pin<Box<dyn Future<Output = ()> + Send + 'static>>)

Never

Trait Implementations

impl Future for DoneFuture

type Output = ()

The type of value produced on completion.

fn poll(self: Pin<&mut Self>, cx: &mut TaskContext<'_>) -> Poll<Self::Output>

Attempts to resolve the future to a final value, registering the current task for wakeup if the value is not yet available.