Struct futures_task::LocalFutureObj

source · [−]

pub struct LocalFutureObj<'a, T> { /* private fields */ }

Expand description

A custom trait object for polling futures, roughly akin to Box<dyn Future<Output = T> + '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.

Implementations

impl<'a, T> LocalFutureObj<'a, T>

pub fn new<F: UnsafeFutureObj<'a, T> + 'a>(f: F) -> Self

Create a LocalFutureObj from a custom trait object representation.

pub unsafe fn into_future_obj(self) -> FutureObj<'a, T>ⓘ
Notable traits for FutureObj<'_, T>
`impl<T> Future for FutureObj<'_, T> type Output = T;`

Converts the LocalFutureObj into a FutureObj.

Safety

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<T> Debug for LocalFutureObj<'_, T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

impl<T> Drop for LocalFutureObj<'_, T>

fn drop(&mut self)

Executes the destructor for this type. Read more

impl<'a, F: Future<Output = ()> + 'a> From<Box<F, Global>> for LocalFutureObj<'a, ()>

fn from(boxed: Box<F>) -> Self

Performs the conversion.

impl<'a> From<Box<dyn Future<Output = ()> + 'a, Global>> for LocalFutureObj<'a, ()>

fn from(boxed: Box<dyn Future<Output = ()> + 'a>) -> Self

Performs the conversion.

impl<'a, T> From<FutureObj<'a, T>> for LocalFutureObj<'a, T>

fn from(f: FutureObj<'a, T>) -> Self

Performs the conversion.

impl<'a, F: Future<Output = ()> + 'a> From<Pin<Box<F, Global>>> for LocalFutureObj<'a, ()>

fn from(boxed: Pin<Box<F>>) -> Self

Performs the conversion.

impl<'a> From<Pin<Box<dyn Future<Output = ()> + 'a, Global>>> for LocalFutureObj<'a, ()>

fn from(boxed: Pin<Box<dyn Future<Output = ()> + 'a>>) -> Self

Performs the conversion.

impl<T> Future for LocalFutureObj<'_, T>

type Output = T

The type of value produced on completion.

fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<T>

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<T> Unpin for LocalFutureObj<'_, T>

Auto Trait Implementations

impl<'a, T> !RefUnwindSafe for LocalFutureObj<'a, T>

impl<'a, T> !Send for LocalFutureObj<'a, T>

impl<'a, T> !Sync for LocalFutureObj<'a, T>

impl<'a, T> !UnwindSafe for LocalFutureObj<'a, T>

Blanket Implementations

impl<T> Any for T where
T: 'static + ?Sized,

pub fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

pub fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

pub fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

const: unstable · source

pub fn from(t: T) -> T

Performs the conversion.

impl<T, U> Into<U> for T where
U: From<T>,

const: unstable · source

pub fn into(self) -> U

Performs the conversion.

impl<F> IntoFuture for F where
F: Future,

type Output = <F as Future>::Output

🔬 This is a nightly-only experimental API. (into_future)

The output that the future will produce on completion.

type Future = F

🔬 This is a nightly-only experimental API. (into_future)

Which kind of future are we turning this into?

pub fn into_future(self) -> <F as IntoFuture>::Future

🔬 This is a nightly-only experimental API. (into_future)

Creates a future from a value.

impl<T, U> TryFrom<U> for T where
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

const: unstable · source

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.