Struct futures_task::LocalFutureObj

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

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>

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.

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

fn drop(&mut self)

Executes the destructor for this type.

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

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

Converts to this type from the input type.

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

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

Converts to this type from the input type.

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

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

Converts to this type from the input type.

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

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

Converts to this type from the input type.

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

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

Converts to this type from the input type.

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>

Attempts to resolve the future to a final value, registering the current task for wakeup if the value is not yet available.

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

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 24 bytes