Struct futures::future::OptionFuture

#[must_use = "futures do nothing unless polled"]
pub struct OptionFuture<F> { /* fields omitted */ }

A future representing a value which may or may not be present.

Created by the From implementation for std::option::Option.

use futures::prelude::*;
use futures::future::OptionFuture;

let fut: OptionFuture<_> = Some(123).into();

Trait Implementations

impl<T> From<Option<T>> for OptionFuture<T>

fn from(option: Option<T>) -> OptionFuture<T>

Performs the conversion.

impl<F> Clone for OptionFuture<F> where     F: Clone,

fn clone(&self) -> OptionFuture<F>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<F> Debug for OptionFuture<F> where     F: Debug,

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

Formats the value using the given formatter.

impl<F> Future for OptionFuture<F> where     F: Future,

type Output = Option<<F as Future>::Output>

🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

The result of the Future.

fn poll(     self: PinMut<OptionFuture<F>>,     cx: &mut Context ) -> Poll<<OptionFuture<F> as Future>::Output>

🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

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