Struct futures_core::future::LocalFutureObj

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

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 and Box<dyn Trait> is not available in no_std contexts.

Methods

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

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>

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> Unpin for LocalFutureObj<'a, T>

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

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, ()>

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

Performs the conversion.

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

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

Performs the conversion.

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

fn drop(&mut self)

Executes the destructor for this type.

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

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

Formats the value using the given formatter.

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 type of value produced on completion.

fn poll(self: Pin<&mut Self>, waker: &Waker) -> 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.