Struct futures::future::FutureOption

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

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

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

Trait Implementations

impl<T> From<Option<T>> for FutureOption<T>

fn from(o: Option<T>) -> FutureOption<T>

Performs the conversion.

impl<F, T, E> Future for FutureOption<F> where
    F: Future<Item = T, Error = E>, 

type Item = Option<T>

A successful value

type Error = E

An error

fn poll(&mut self, cx: &mut Context) -> Result<Async<Option<T>>, E>

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

impl<T> Debug for FutureOption<T> where
    T: Debug, 

fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl<T> Clone for FutureOption<T> where
    T: Clone, 

fn clone(&self) -> FutureOption<T>

Returns a copy of the value.

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

Performs copy-assignment from source.