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## VecCache

# Struct VecCache

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    pub struct VecCache<K: Idx, V, I> {
        buckets: [AtomicPtr<Slot<V>>; 21],
        present: [AtomicPtr<Slot<()>>; 21],
        len: AtomicUsize,
        key: PhantomData<(K, I)>,
    }

Expand description

In-memory cache for queries whose keys are densely-numbered IDs (e.g `CrateNum`, `LocalDefId`), and can therefore be used as indices into a dense vector of cached values.

(As of #124780 the underlying storage is not an actual `Vec`, but rather a series of increasingly-large buckets, for improved performance when the parallel frontend is using multiple threads.)

Each entry in the cache stores the query’s return value (`V`), and also an associated index (`I`), which in practice is a `DepNodeIndex` used for query dependency tracking.

## Fields§

§`buckets: [AtomicPtr<Slot<V>>; 21]`§`present: [AtomicPtr<Slot<()>>; 21]`§`len: AtomicUsize`§`key: PhantomData<(K, I)>`

## Implementations§

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### impl<K, V, I> VecCache<K, V, I>
where K: Eq + Idx + Copy + Debug, V: Copy, I: Idx + Copy,

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#### pub fn lookup(&self, key: &K) -> Option<(V, I)>

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#### pub fn complete(&self, key: K, value: V, index: I)

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#### pub fn for_each(&self, f: &mut dyn FnMut(&K, &V, I))

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#### pub fn len(&self) -> usize

## Trait Implementations§

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### impl<K: Idx, V, I> Default for VecCache<K, V, I>

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#### fn default() -> Self

Returns the “default value” for a type. Read more
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### impl<K: Idx, V, I> Drop for VecCache<K, V, I>

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#### fn drop(&mut self)

Executes the destructor for this type. Read more
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#### fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (`pin_ergonomics`)
Execute the destructor for this type, but different to `Drop::drop`, it requires `self` to be pinned. Read more

## Auto Trait Implementations§

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### impl<K, V, I> !Freeze for VecCache<K, V, I>

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### impl<K, V, I> DynSend for VecCache<K, V, I>
where K: DynSend, I: DynSend,

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### impl<K, V, I> DynSync for VecCache<K, V, I>
where K: DynSync, I: DynSync,

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### impl<K, V, I> RefUnwindSafe for VecCache<K, V, I>
where K: RefUnwindSafe, I: RefUnwindSafe,

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### impl<K, V, I> Send for VecCache<K, V, I>
where K: Send, I: Send,

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### impl<K, V, I> Sync for VecCache<K, V, I>
where K: Sync, I: Sync,

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### impl<K, V, I> Unpin for VecCache<K, V, I>
where K: Unpin, I: Unpin,

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### impl<K, V, I> UnsafeUnpin for VecCache<K, V, I>

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### impl<K, V, I> UnwindSafe for VecCache<K, V, I>
where K: UnwindSafe, I: UnwindSafe, V: RefUnwindSafe,

## Blanket Implementations§

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### impl<T> Aligned for T

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#### const ALIGN: Alignment = const ALIGN: Alignment = Alignment::of::<Self>();

Alignment of `Self`.
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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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### 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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### 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, 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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### impl<T> WithSubscriber for T

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#### fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
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#### fn with_current_subscriber(self) -> WithDispatch<Self>

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

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 344 bytes