Struct futures_core::future::FutureObj

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pub struct FutureObj<'a, T>(_);

[−] Expand description

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.

Methods

impl<'a, T> FutureObj<'a, T>[−]

Important traits for FutureObj<'_, T>

impl<T, '_> Future for FutureObj<'_, T> type Output = T;

pub fn new<F: UnsafeFutureObj<'a, T> + Send>(f: F) -> FutureObj<'a, T>[+]

Create a FutureObj from a custom trait object representation.

Trait Implementations

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

impl<'a, T> From<FutureObj<'a, T>> for LocalFutureObj<'a, T>[+]

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Important traits for LocalFutureObj<'_, T>

impl<T, '_> Future for LocalFutureObj<'_, T> type Output = T;

fn from(f: FutureObj<'a, T>) -> LocalFutureObj<'a, T>[+]

Performs the conversion.

impl<'a, F: Future<Output = ()> + Send + 'a> From<Box<F>> for FutureObj<'a, ()>[+]

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

Performs the conversion.

impl<'a> From<Box<dyn Future<Output = ()> + 'a + Send>> for FutureObj<'a, ()>[+]

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

Performs the conversion.

impl<'a, F: Future<Output = ()> + Send + 'a> From<Pin<Box<F>>> for FutureObj<'a, ()>[+]

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

Performs the conversion.

impl<'a> From<Pin<Box<dyn Future<Output = ()> + 'a + Send>>> for FutureObj<'a, ()>[+]

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

Performs the conversion.

impl<T, '_> Send for FutureObj<'_, T>

impl<T, '_> Debug for FutureObj<'_, T>[+]

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

Formats the value using the given formatter.

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 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.