[−][src]Struct futures_util::task::FutureObj

pub struct FutureObj<'a, T>(_);
[−]

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.

Implementations

impl<'a, T> FutureObj<'a, T>[src][−]

pub fn new<F>(f: F) -> FutureObj<'a, T>ⓘ

Notable traits for FutureObj<'_, T>

impl<'_, T> Future for FutureObj<'_, T> type Output = T;
 where
    F: UnsafeFutureObj<'a, T> + Send, [src][−]

Create a FutureObj from a custom trait object representation.

Trait Implementations

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

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

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

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

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

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

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

type Output = T

The type of value produced on completion.

impl<'_, T> Send for FutureObj<'_, T>[src]

impl<'_, T> Unpin for FutureObj<'_, T>[src]

Auto Trait Implementations

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

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

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

Blanket Implementations

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

impl<T> Borrow<T> for T where
    T: ?Sized, [src][+]

impl<T> BorrowMut<T> for T where
    T: ?Sized, [src][+]

impl<T> From<T> for T[src][+]

impl<T, U> Into<U> for T where
    U: From<T>, [src][+]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, [src][+]

type Error = Infallible

The type returned in the event of a conversion error.

impl<F, T, E> TryFuture for F where
    F: Future<Output = Result<T, E>> + ?Sized, [src][+]

type Ok = T

The type of successful values yielded by this future

type Error = E

The type of failures yielded by this future

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, [src][+]

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

The type returned in the event of a conversion error.