flams_router_vscode::server_fn::inventory::core::task

Struct RawWakerVTable

1.36.0 · Source 
pub struct RawWakerVTable {
    clone: unsafe fn(*const ()) -> RawWaker,
    wake: unsafe fn(*const ()),
    wake_by_ref: unsafe fn(*const ()),
    drop: unsafe fn(*const ()),
}
Expand description

A virtual function pointer table (vtable) that specifies the behavior of a RawWaker.

The pointer passed to all functions inside the vtable is the data pointer from the enclosing RawWaker object.

The functions inside this struct are only intended to be called on the data pointer of a properly constructed RawWaker object from inside the RawWaker implementation. Calling one of the contained functions using any other data pointer will cause undefined behavior.

Note that while this type implements PartialEq, comparing function pointers, and hence comparing structs like this that contain function pointers, is unreliable: pointers to the same function can compare inequal (because functions are duplicated in multiple codegen units), and pointers to different functions can compare equal (since identical functions can be deduplicated within a codegen unit).

§Thread safety

If the RawWaker will be used to construct a Waker then these functions must all be thread-safe (even though RawWaker is !Send + !Sync). This is because Waker is Send + Sync, and it may be moved to arbitrary threads or invoked by & reference. For example, this means that if the clone and drop functions manage a reference count, they must do so atomically.

However, if the RawWaker will be used to construct a LocalWaker instead, then these functions don’t need to be thread safe. This means that !Send + !Sync data can be stored in the data pointer, and reference counting does not need any atomic synchronization. This is because LocalWaker is not thread safe itself, so it cannot be sent across threads.

Fields§

§clone: unsafe fn(*const ()) -> RawWaker§wake: unsafe fn(*const ())§wake_by_ref: unsafe fn(*const ())§drop: unsafe fn(*const ())

Implementations§

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impl RawWakerVTable

1.36.0 (const: 1.36.0) · Source

pub const fn new( clone: unsafe fn(*const ()) -> RawWaker, wake: unsafe fn(*const ()), wake_by_ref: unsafe fn(*const ()), drop: unsafe fn(*const ()), ) -> RawWakerVTable

Creates a new RawWakerVTable from the provided clone, wake, wake_by_ref, and drop functions.

If the RawWaker will be used to construct a Waker then these functions must all be thread-safe (even though RawWaker is !Send + !Sync). This is because Waker is Send + Sync, and it may be moved to arbitrary threads or invoked by & reference. For example, this means that if the clone and drop functions manage a reference count, they must do so atomically.

However, if the RawWaker will be used to construct a LocalWaker instead, then these functions don’t need to be thread safe. This means that !Send + !Sync data can be stored in the data pointer, and reference counting does not need any atomic synchronization. This is because LocalWaker is not thread safe itself, so it cannot be sent across threads.

§clone

This function will be called when the RawWaker gets cloned, e.g. when the Waker/LocalWaker in which the RawWaker is stored gets cloned.

The implementation of this function must retain all resources that are required for this additional instance of a RawWaker and associated task. Calling wake on the resulting RawWaker should result in a wakeup of the same task that would have been awoken by the original RawWaker.

§wake

This function will be called when wake is called on the Waker. It must wake up the task associated with this RawWaker.

The implementation of this function must make sure to release any resources that are associated with this instance of a RawWaker and associated task.

§wake_by_ref

This function will be called when wake_by_ref is called on the Waker. It must wake up the task associated with this RawWaker.

This function is similar to wake, but must not consume the provided data pointer.

§drop

This function will be called when a Waker/LocalWaker gets dropped.

The implementation of this function must make sure to release any resources that are associated with this instance of a RawWaker and associated task.

Trait Implementations§

1.36.0 · Source§

impl Clone for RawWakerVTable

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fn clone(&self) -> RawWakerVTable

Returns a duplicate of the value. Read more
1.0.0 · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
1.36.0 · Source§

impl Debug for RawWakerVTable

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

Formats the value using the given formatter. Read more
1.36.0 · Source§

impl PartialEq for RawWakerVTable

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fn eq(&self, other: &RawWakerVTable) -> bool

Tests for self and other values to be equal, and is used by ==.
1.0.0 · Source§

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.36.0 · Source§

impl Copy for RawWakerVTable

1.36.0 · Source§

impl StructuralPartialEq for RawWakerVTable

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impl<S, D, Swp, Dwp, T> AdaptInto<D, Swp, Dwp, T> for S
where T: Real + Zero + Arithmetics + Clone, Swp: WhitePoint<T>, Dwp: WhitePoint<T>, D: AdaptFrom<S, Swp, Dwp, T>,

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fn adapt_into_using<M>(self, method: M) -> D
where M: TransformMatrix<T>,

Convert the source color to the destination color using the specified method.
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fn adapt_into(self) -> D

Convert the source color to the destination color using the bradford method by default.
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type ArchivedMetadata = ()

The archived version of the pointer metadata for this type.
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impl<T, C> ArraysFrom<C> for T
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fn arrays_from(colors: C) -> T

Cast a collection of colors into a collection of arrays.
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impl<T, C> ArraysInto<C> for T
where C: FromArrays<T>,

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fn arrays_into(self) -> C

Cast this collection of arrays into a collection of colors.
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The number type that’s used in parameters when converting.
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Converts self into C, using the provided parameters.
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🔬This is a nightly-only experimental API. (clone_to_uninit)
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fn components_from(colors: C) -> T

Cast a collection of colors into a collection of color components.
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The number type that’s used in parameters when converting.
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Convert into T with values clamped to the color defined bounds Read more
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Convert into T. The resulting color might be invalid in its color space Read more
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type Error = <C as TryFromComponents<T>>::Error

The error for when try_into_colors fails to cast.
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fn try_components_into(self) -> Result<C, <T as TryComponentsInto<C>>::Error>

Try to cast this collection of color components into a collection of colors. Read more
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fn try_into_color(self) -> Result<U, OutOfBounds<U>>

Convert into T, returning ok if the color is inside of its defined range, otherwise an OutOfBounds error is returned which contains the unclamped color. Read more
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Cast a collection of colors into a collection of unsigned integers.
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Cast this collection of unsigned integers into a collection of colors.
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