Struct futures_task::FutureObj

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pub struct FutureObj<'a, T>(/* private fields */);
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.

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impl<'a, T> FutureObj<'a, T>

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

Create a FutureObj from a custom trait object representation.

Trait Implementations§

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

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

Formats the value using the given formatter. Read more
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impl<'a, F: Future<Output = ()> + Send + 'a> From<Box<F>> for FutureObj<'a, ()>

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

Converts to this type from the input type.
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impl<'a> From<Box<dyn Future<Output = ()> + Send + 'a>> for FutureObj<'a, ()>

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

Converts to this type from the input type.
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impl<'a, T> From<FutureObj<'a, T>> for LocalFutureObj<'a, T>

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

Converts to this type from the input type.
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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

Converts to this type from the input type.
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impl<'a> From<Pin<Box<dyn Future<Output = ()> + Send + 'a>>> for FutureObj<'a, ()>

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

Converts to this type from the input type.
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impl<T> Future for FutureObj<'_, T>

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type Output = T

The type of value produced on completion.
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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. Read more
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impl<T> Send for FutureObj<'_, T>

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

Auto Trait Implementations§

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impl<'a, T> Freeze for FutureObj<'a, T>

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

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

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

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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

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type Output = <F as Future>::Output

The output that the future will produce on completion.
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type IntoFuture = F

Which kind of future are we turning this into?
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fn into_future(self) -> <F as IntoFuture>::IntoFuture

Creates a future from a value. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.