Struct futures_util::future::Lazy

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

Future for the lazy function.

Trait Implementations

impl<F: Debug> Debug for Lazy<F>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<F, R> FusedFuture for Lazy<F> where
    F: FnOnce(&mut Context<'_>) -> R, 

fn is_terminated(&self) -> bool

Returns true if the underlying future should no longer be polled.

impl<F, R> Future for Lazy<F> where
    F: FnOnce(&mut Context<'_>) -> R, 

type Output = R

The type of value produced on completion.

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

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

impl<F> Unpin for Lazy<F>