Struct futures::future::FutureObj [−][src]
pub struct FutureObj<'a, T>(_);
🔬 This is a nightly-only experimental API. (futures_api)
futures in libcore are unstable
A custom trait object for polling futures, roughly akin to
Box<dyn Future<Output = T> + Send + 'a>.
This custom trait object was introduced for two reasons:
- Currently it is not possible to take
dyn Traitby value andBox<dyn Trait>is not available in no_std contexts. - The
Futuretrait is currently not object safe: TheFuture::pollmethod makes uses the arbitrary self types feature and traits in which this feature is used are currently not object safe due to current compiler limitations. (See tracking issue for arbitray self types for more information #44874)
Methods
impl<'a, T> FutureObj<'a, T>[src]
impl<'a, T> FutureObj<'a, T>pub fn new<F>(f: F) -> FutureObj<'a, T> where
F: Send + UnsafeFutureObj<'a, T>, [src]
pub fn new<F>(f: F) -> FutureObj<'a, T> where
F: Send + UnsafeFutureObj<'a, T>, 🔬 This is a nightly-only experimental API. (futures_api)
futures in libcore are unstable
Create a FutureObj from a custom trait object representation.
Trait Implementations
impl<'a, T> Debug for FutureObj<'a, T>[src]
impl<'a, T> Debug for FutureObj<'a, T>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<'a, T> Future for FutureObj<'a, T>[src]
impl<'a, T> Future for FutureObj<'a, T>type Output = T
🔬 This is a nightly-only experimental API. (futures_api)
futures in libcore are unstable
The result of the Future.
fn poll(self: PinMut<FutureObj<'a, T>>, cx: &mut Context) -> Poll<T>[src]
fn poll(self: PinMut<FutureObj<'a, T>>, cx: &mut Context) -> Poll<T>🔬 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<'a, T> From<FutureObj<'a, T>> for LocalFutureObj<'a, T>[src]
impl<'a, T> From<FutureObj<'a, T>> for LocalFutureObj<'a, T>fn from(f: FutureObj<'a, T>) -> LocalFutureObj<'a, T>[src]
fn from(f: FutureObj<'a, T>) -> LocalFutureObj<'a, T>Performs the conversion.
impl<'a, T> Send for FutureObj<'a, T>[src]
impl<'a, T> Send for FutureObj<'a, T>impl<'a, F> From<Box<F>> for FutureObj<'a, ()> where
F: 'a + Send + Future<Output = ()>, [src]
impl<'a, F> From<Box<F>> for FutureObj<'a, ()> where
F: 'a + Send + Future<Output = ()>, impl<'a, F> From<PinBox<F>> for FutureObj<'a, ()> where
F: 'a + Send + Future<Output = ()>, [src]
impl<'a, F> From<PinBox<F>> for FutureObj<'a, ()> where
F: 'a + Send + Future<Output = ()>,