Context in core::task - Rust
Description: The context of an asynchronous task.

# Struct Context

1.36.0 · Source

    pub struct Context<'a> { /* private fields */ }

Expand description

The context of an asynchronous task.

Currently, `Context` only serves to provide access to a `&Waker` which can be used to wake the current task.

## Implementations§

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### impl<'a> Context<'a>

1.36.0 (const: 1.82.0) · Source

#### pub const fn from_waker(waker: &'a Waker) -> Self

Creates a new `Context` from a `&Waker`.

1.36.0 (const: 1.82.0) · Source

#### pub const fn waker(&self) -> &'a Waker

Returns a reference to the `Waker` for the current task.

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#### pub const fn local_waker(&self) -> &'a LocalWaker

🔬This is a nightly-only experimental API. (`local_waker` #118959)

Returns a reference to the `LocalWaker` for the current task.

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#### pub const fn ext(&mut self) -> &mut dyn Any

🔬This is a nightly-only experimental API. (`context_ext` #123392)

Returns a reference to the extension data for the current task.

## Trait Implementations§

1.36.0 · Source§

### impl Debug for Context<'_>

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

Formats the value using the given formatter. Read more

## Auto Trait Implementations§

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### impl<'a> Freeze for Context<'a>

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### impl<'a> RefUnwindSafe for Context<'a>

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### impl<'a> !Send for Context<'a>

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### impl<'a> !Sync for Context<'a>

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### impl<'a> Unpin for Context<'a>

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### impl<'a> UnwindSafe for Context<'a>

## 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<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.