[−][src]Struct futures_core::future::LocalFutureObj
A custom trait object for polling futures, roughly akin to
Box<dyn Future<Output = T> + 'a>
.
This custom trait object was introduced for two reasons:
- Currently it is not possible to take
dyn Trait
by value andBox<dyn Trait>
is not available in no_std contexts. - The
Future
trait is currently not object safe: TheFuture::poll
method 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 arbitrary self types for more information #44874)
Methods
impl<'a, T> LocalFutureObj<'a, T>
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impl<'a, T> LocalFutureObj<'a, T>
pub fn new<F: UnsafeFutureObj<'a, T> + 'a>(f: F) -> LocalFutureObj<'a, T>
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pub fn new<F: UnsafeFutureObj<'a, T> + 'a>(f: F) -> LocalFutureObj<'a, T>
Create a LocalFutureObj
from a custom trait object representation.
pub unsafe fn into_future_obj(self) -> FutureObj<'a, T>
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pub unsafe fn into_future_obj(self) -> FutureObj<'a, T>
Converts the LocalFutureObj
into a FutureObj
To make this operation safe one has to ensure that the UnsafeFutureObj
instance from which this LocalFutureObj
was created actually
implements Send
.
Trait Implementations
impl<'a, T> From<FutureObj<'a, T>> for LocalFutureObj<'a, T>
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impl<'a, T> From<FutureObj<'a, T>> for LocalFutureObj<'a, T>
fn from(f: FutureObj<'a, T>) -> LocalFutureObj<'a, T>
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fn from(f: FutureObj<'a, T>) -> LocalFutureObj<'a, T>
Performs the conversion.
impl<'a, F: Future<Output = ()> + 'a> From<Pin<Box<F>>> for LocalFutureObj<'a, ()>
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impl<'a, F: Future<Output = ()> + 'a> From<Pin<Box<F>>> for LocalFutureObj<'a, ()>
impl<'a, F: Future<Output = ()> + 'a> From<Box<F>> for LocalFutureObj<'a, ()>
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impl<'a, F: Future<Output = ()> + 'a> From<Box<F>> for LocalFutureObj<'a, ()>
impl<'a, T> Drop for LocalFutureObj<'a, T>
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impl<'a, T> Drop for LocalFutureObj<'a, T>
impl<'a, T> Debug for LocalFutureObj<'a, T>
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impl<'a, T> Debug for LocalFutureObj<'a, T>
fn fmt(&self, f: &mut Formatter) -> Result
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fn fmt(&self, f: &mut Formatter) -> Result
Formats the value using the given formatter. Read more
impl<'a, T> Unpin for LocalFutureObj<'a, T>
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impl<'a, T> Unpin for LocalFutureObj<'a, T>
impl<'a, T> Future for LocalFutureObj<'a, T>
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impl<'a, T> Future for LocalFutureObj<'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: Pin<&mut Self>, lw: &LocalWaker) -> Poll<T>
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fn poll(self: Pin<&mut Self>, lw: &LocalWaker) -> 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
Auto Trait Implementations
impl<'a, T> !Send for LocalFutureObj<'a, T>
impl<'a, T> !Send for LocalFutureObj<'a, T>
impl<'a, T> !Sync for LocalFutureObj<'a, T>
impl<'a, T> !Sync for LocalFutureObj<'a, T>
Blanket Implementations
impl<F, T, E> TryFuture for F where
F: Future<Output = Result<T, E>>,
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impl<F, T, E> TryFuture for F where
F: Future<Output = Result<T, E>>,
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(Pin<&mut F>, &LocalWaker) -> Poll<<F as Future>::Output>
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fn try_poll(Pin<&mut F>, &LocalWaker) -> Poll<<F as Future>::Output>
Poll this TryFuture
as if it were a Future
. Read more
impl<T, U> Into for T where
U: From<T>,
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impl<T, U> Into for T where
U: From<T>,
impl<T> From for T
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impl<T> From for T
impl<T, U> TryFrom for T where
T: From<U>,
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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>
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
try_from
)Performs the conversion.
impl<T> Borrow for T where
T: ?Sized,
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impl<T> Borrow for T where
T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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impl<T> Any for T where
T: 'static + ?Sized,
fn get_type_id(&self) -> TypeId
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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> BorrowMut for T where
T: ?Sized,
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impl<T> BorrowMut for T where
T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<T, U> TryInto for T where
U: TryFrom<T>,
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impl<T, U> TryInto for T where
U: TryFrom<T>,