Struct OngoingAsyncAction

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pub struct OngoingAsyncAction<T> {
    strong: Rc<AsyncAction<T>>,
}

Expand description

Helper type to keep track of ongoing async actions that can succeed in different functions.

This type can only have one strong reference and many weak references.

The strong reference should be dropped in the first function where the action succeeds. Then other functions can drop the weak references when they can’t be upgraded.

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§strong: Rc<AsyncAction<T>>

Implementations§

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impl<T> OngoingAsyncAction<T>

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pub(crate) fn set(value: T) -> (Self, WeakOngoingAsyncAction<T>)

Create a new async action that sets the given value.

Returns both a strong and a weak reference.

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pub(crate) fn remove() -> (Self, WeakOngoingAsyncAction<T>)

Create a new async action that removes a value.

Returns both a strong and a weak reference.

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pub(crate) fn as_value(&self) -> Option<&T>

Get the inner value, if any.

Trait Implementations§

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impl<T: Debug> Debug for OngoingAsyncAction<T>

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

impl<T> Freeze for OngoingAsyncAction<T>

impl<T> RefUnwindSafe for OngoingAsyncAction<T>
where T: RefUnwindSafe,

impl<T> !Send for OngoingAsyncAction<T>

impl<T> !Sync for OngoingAsyncAction<T>

impl<T> Unpin for OngoingAsyncAction<T>

impl<T> UnwindSafe for OngoingAsyncAction<T>
where T: RefUnwindSafe,

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, W> HasTypeWitness<W> for T
where W: MakeTypeWitness<Arg = T>, T: ?Sized,

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const WITNESS: W = W::MAKE

A constant of the type witness

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impl<T> Identity for T
where T: ?Sized,

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const TYPE_EQ: TypeEq<T, <T as Identity>::Type> = TypeEq::NEW

Proof that Self is the same type as Self::Type, provides methods for casting between Self and Self::Type.

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type Type = T

The same type as Self, used to emulate type equality bounds (T == U) with associated type equality constraints (T: Identity<Type = U>).

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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impl<T, U> Into 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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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