Struct FutureWriter

pub struct FutureWriter<T> { /* private fields */ }
Expand description

Represents the writable end of a Component Model future.

Note that FutureWriter instances must be disposed of using either write or close; otherwise the in-store representation will leak and the reader end will hang indefinitely. Consider using GuardedFutureWriter to ensure that disposal happens automatically.

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impl<T> FutureWriter<T>

pub async fn write(self, accessor: impl AsAccessor, value: T) -> bool
where T: Lower + Send + Sync + 'static,

Write the specified value to this future.

The returned Future will yield true if the read end accepted the value; otherwise it will return false, meaning the read end was dropped before the value could be delivered.

§Panics

Panics if the store that the [Accessor] is derived from does not own this future.

pub async fn watch_reader(&mut self, accessor: impl AsAccessor)

Wait for the read end of this future is dropped.

The [Accessor] provided can be acquired from Instance::run_concurrent or from within a host function for example.

§Panics

Panics if the store that the [Accessor] is derived from does not own this future.

pub fn close(&mut self, store: impl AsContextMut)
where T: Lower + Send + Sync + 'static,

Close this FutureWriter, writing the default value.

§Panics

Panics if the store that the [Accessor] is derived from does not own this future. Usage of this future after calling close will also cause a panic.

pub fn close_with(&mut self, accessor: impl AsAccessor)
where T: Lower + Send + Sync + 'static,

Convenience method around Self::close.

pub fn guard<A>(self, accessor: A) -> GuardedFutureWriter<T, A>
where T: Lower + Send + Sync + 'static, A: AsAccessor,

Returns a GuardedFutureWriter which will auto-close this future on drop and clean it up from the store.

Note that the accessor provided must own this future and is additionally transferred to the GuardedFutureWriter return value.

Trait Implementations§

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impl<T, A> From<GuardedFutureWriter<T, A>> for FutureWriter<T>
where T: Lower + Send + Sync + 'static, A: AsAccessor,

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fn from(guard: GuardedFutureWriter<T, A>) -> FutureWriter<T>

Converts to this type from the input type.

Auto Trait Implementations§

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impl<T> Freeze for FutureWriter<T>

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impl<T> RefUnwindSafe for FutureWriter<T>

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impl<T> Send for FutureWriter<T>

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impl<T> Sync for FutureWriter<T>

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impl<T> Unpin for FutureWriter<T>

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impl<T> UnwindSafe for FutureWriter<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> 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<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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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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impl<T> Pointable for T

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const ALIGN: usize

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Pointee for T

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type Pointer = u32

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fn debug( pointer: <T as Pointee>::Pointer, f: &mut Formatter<'_>, ) -> Result<(), Error>

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impl<T> Same for T

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type Output = T

Should always be Self
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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.
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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

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Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more