[−][src]Struct futures_util::task::FutureObj
A custom trait object for polling futures, roughly akin to
Box<dyn Future<Output = T> + Send + 'a>
.
This custom trait object was introduced as currently it is not possible to
take dyn Trait
by value and Box<dyn Trait>
is not available in no_std
contexts.
You should generally not need to use this type outside of no_std
or when
implementing Spawn
, consider using BoxFuture
instead.
Implementations
impl<'a, T> FutureObj<'a, T>
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pub fn new<F>(f: F) -> FutureObj<'a, T>ⓘ where
F: UnsafeFutureObj<'a, T> + Send,
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F: UnsafeFutureObj<'a, T> + Send,
Create a FutureObj
from a custom trait object representation.
Trait Implementations
impl<'_, T> Debug for FutureObj<'_, T>
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impl<'a, F> From<Box<F>> for FutureObj<'a, ()> where
F: 'a + Send + Future<Output = ()>,
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F: 'a + Send + Future<Output = ()>,
impl<'a> From<Box<dyn Future<Output = ()> + 'a + Send>> for FutureObj<'a, ()>
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impl<'a, T> From<FutureObj<'a, T>> for LocalFutureObj<'a, T>
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fn from(f: FutureObj<'a, T>) -> LocalFutureObj<'a, T>ⓘNotable traits for LocalFutureObj<'_, T>
impl<'_, T> Future for LocalFutureObj<'_, T> type Output = T;
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Notable traits for LocalFutureObj<'_, T>
impl<'_, T> Future for LocalFutureObj<'_, T> type Output = T;
impl<'a, F> From<Pin<Box<F>>> for FutureObj<'a, ()> where
F: 'a + Send + Future<Output = ()>,
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F: 'a + Send + Future<Output = ()>,
impl<'a> From<Pin<Box<dyn Future<Output = ()> + 'a + Send>>> for FutureObj<'a, ()>
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impl<'_, T> Future for FutureObj<'_, T>
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type Output = T
The type of value produced on completion.
fn poll(self: Pin<&mut FutureObj<'_, T>>, cx: &mut Context<'_>) -> Poll<T>
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impl<'_, T> Send for FutureObj<'_, T>
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impl<'_, T> Unpin for FutureObj<'_, T>
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Auto Trait Implementations
impl<'a, T> !RefUnwindSafe for FutureObj<'a, T>
impl<'a, T> !Sync for FutureObj<'a, T>
impl<'a, T> !UnwindSafe for FutureObj<'a, T>
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut Tⓘ
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<F, T, E> TryFuture for F where
F: Future<Output = Result<T, E>> + ?Sized,
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F: Future<Output = Result<T, E>> + ?Sized,
type Ok = T
The type of successful values yielded by this future
type Error = E
The type of failures yielded by this future
fn try_poll(
self: Pin<&mut F>,
cx: &mut Context<'_>
) -> Poll<<F as Future>::Output>
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self: Pin<&mut F>,
cx: &mut Context<'_>
) -> Poll<<F as Future>::Output>
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,