[−][src]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 Option.
Examples
#![feature(async_await, await_macro, futures_api)] use futures::future::{self, OptionFuture}; let mut a: OptionFuture<_> = Some(future::ready(123)).into(); assert_eq!(await!(a), Some(123)); a = None.into(); assert_eq!(await!(a), None);
Trait Implementations
impl<T> From<Option<T>> for OptionFuture<T>[src]
impl<T> From<Option<T>> for OptionFuture<T>fn from(option: Option<T>) -> OptionFuture<T>[src]
fn from(option: Option<T>) -> OptionFuture<T>Performs the conversion.
impl<F> Future for OptionFuture<F> where
F: Future, [src]
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>[src]
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. Read more
impl<F> Debug for OptionFuture<F> where
F: Debug, [src]
impl<F> Debug for OptionFuture<F> where
F: Debug, fn fmt(&self, f: &mut Formatter) -> Result<(), Error>[src]
fn fmt(&self, f: &mut Formatter) -> Result<(), Error>Formats the value using the given formatter. Read more
impl<F> Clone for OptionFuture<F> where
F: Clone, [src]
impl<F> Clone for OptionFuture<F> where
F: Clone, fn clone(&self) -> OptionFuture<F>[src]
fn clone(&self) -> OptionFuture<F>Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)1.0.0[src]
fn clone_from(&mut self, source: &Self)Performs copy-assignment from source. Read more
Auto Trait Implementations
impl<F> Send for OptionFuture<F> where
F: Send,
impl<F> Send for OptionFuture<F> where
F: Send, impl<F> Sync for OptionFuture<F> where
F: Sync,
impl<F> Sync for OptionFuture<F> where
F: Sync, Blanket Implementations
impl<T> From for T[src]
impl<T> From for Timpl<T, U> TryFrom for T where
T: From<U>, [src]
impl<T, U> TryFrom for T where
T: From<U>, type Error = !
try_from)The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>try_from)Performs the conversion.
impl<T, U> TryInto for T where
U: TryFrom<T>, [src]
impl<T, U> TryInto for T where
U: TryFrom<T>, type Error = <U as TryFrom<T>>::Error
try_from)The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>try_from)Performs the conversion.
impl<T, U> Into for T where
U: From<T>, [src]
impl<T, U> Into for T where
U: From<T>, impl<T> Borrow for T where
T: ?Sized, [src]
impl<T> Borrow for T where
T: ?Sized, ⓘImportant traits for &'a mut Ifn borrow(&self) -> &T[src]
fn borrow(&self) -> &TImmutably borrows from an owned value. Read more
impl<T> BorrowMut for T where
T: ?Sized, [src]
impl<T> BorrowMut for T where
T: ?Sized, ⓘImportant traits for &'a mut Ifn borrow_mut(&mut self) -> &mut T[src]
fn borrow_mut(&mut self) -> &mut TMutably borrows from an owned value. Read more
impl<T> Any for T where
T: 'static + ?Sized, [src]
impl<T> Any for T where
T: 'static + ?Sized, fn get_type_id(&self) -> TypeId[src]
fn get_type_id(&self) -> TypeId🔬 This is a nightly-only experimental API. (get_type_id)
this method will likely be replaced by an associated static
Gets the TypeId of self. Read more
impl<T> ToOwned for T where
T: Clone, [src]
impl<T> ToOwned for T where
T: Clone, type Owned = T
fn to_owned(&self) -> T[src]
fn to_owned(&self) -> TCreates owned data from borrowed data, usually by cloning. Read more
fn clone_into(&self, target: &mut T)[src]
fn clone_into(&self, target: &mut T)🔬 This is a nightly-only experimental API. (toowned_clone_into)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
impl<T> FutureExt for T where
T: Future + ?Sized, [src]
impl<T> FutureExt for T where
T: Future + ?Sized, fn map<U, F>(self, f: F) -> Map<Self, F> where
F: FnOnce(Self::Output) -> U, [src]
fn map<U, F>(self, f: F) -> Map<Self, F> where
F: FnOnce(Self::Output) -> U, Map this future's output to a different type, returning a new future of the resulting type. Read more
fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
F: FnOnce(Self::Output) -> Fut,
Fut: Future, [src]
fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
F: FnOnce(Self::Output) -> Fut,
Fut: Future, Chain on a computation for when a future finished, passing the result of the future to the provided closure f. Read more
fn join<Fut2>(self, other: Fut2) -> Join<Self, Fut2> where
Fut2: Future, [src]
fn join<Fut2>(self, other: Fut2) -> Join<Self, Fut2> where
Fut2: Future, Joins the result of two futures, waiting for them both to complete. Read more
fn join3<Fut2, Fut3>(
self,
future2: Fut2,
future3: Fut3
) -> Join3<Self, Fut2, Fut3> where
Fut2: Future,
Fut3: Future, [src]
fn join3<Fut2, Fut3>(
self,
future2: Fut2,
future3: Fut3
) -> Join3<Self, Fut2, Fut3> where
Fut2: Future,
Fut3: Future, Same as join, but with more futures. Read more
fn join4<Fut2, Fut3, Fut4>(
self,
future2: Fut2,
future3: Fut3,
future4: Fut4
) -> Join4<Self, Fut2, Fut3, Fut4> where
Fut2: Future,
Fut3: Future + Future,
Fut4: Future, [src]
fn join4<Fut2, Fut3, Fut4>(
self,
future2: Fut2,
future3: Fut3,
future4: Fut4
) -> Join4<Self, Fut2, Fut3, Fut4> where
Fut2: Future,
Fut3: Future + Future,
Fut4: Future, Same as join, but with more futures. Read more
fn join5<Fut2, Fut3, Fut4, Fut5>(
self,
future2: Fut2,
future3: Fut3,
future4: Fut4,
future5: Fut5
) -> Join5<Self, Fut2, Fut3, Fut4, Fut5> where
Fut2: Future,
Fut3: Future + Future,
Fut4: Future,
Fut5: Future, [src]
fn join5<Fut2, Fut3, Fut4, Fut5>(
self,
future2: Fut2,
future3: Fut3,
future4: Fut4,
future5: Fut5
) -> Join5<Self, Fut2, Fut3, Fut4, Fut5> where
Fut2: Future,
Fut3: Future + Future,
Fut4: Future,
Fut5: Future, Same as join, but with more futures. Read more
fn into_stream(self) -> IntoStream<Self>[src]
fn into_stream(self) -> IntoStream<Self>Convert this future into a single element stream. Read more
fn flatten(self) -> Flatten<Self> where
Self::Output: Future, [src]
fn flatten(self) -> Flatten<Self> where
Self::Output: Future, Flatten the execution of this future when the successful result of this future is itself another future. Read more
fn flatten_stream(self) -> FlattenStream<Self> where
Self::Output: Stream, [src]
fn flatten_stream(self) -> FlattenStream<Self> where
Self::Output: Stream, Flatten the execution of this future when the successful result of this future is a stream. Read more
fn fuse(self) -> Fuse<Self>[src]
fn fuse(self) -> Fuse<Self>Fuse a future such that poll will never again be called once it has completed. Read more
fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnOnce(&Self::Output), [src]
fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnOnce(&Self::Output), Do something with the output of a future before passing it on. Read more
fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe, [src]
fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe, 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
fn boxed(self) -> PinBox<Self>[src]
fn boxed(self) -> PinBox<Self>Wrap the future in a Box, pinning it.
fn unit_error(self) -> UnitError<Self>[src]
fn unit_error(self) -> UnitError<Self>Turns a Future into a TryFuture with Error = ().
fn with_spawner<Sp>(self, spawner: Sp) -> WithSpawner<Self, Sp> where
Sp: Spawn, [src]
fn with_spawner<Sp>(self, spawner: Sp) -> WithSpawner<Self, Sp> where
Sp: Spawn, Assigns the provided Spawn to be used when spawning tasks from within the future. Read more
fn poll_unpin(&mut self, cx: &mut Context) -> Poll<Self::Output> where
Self: Unpin, [src]
fn poll_unpin(&mut self, cx: &mut Context) -> Poll<Self::Output> where
Self: Unpin, A convenience for calling Future::poll on Unpin future types.