Sharded in rustc_data_structures::sharded - Rust
Description: An array of cache-line aligned inner locked structures with convenience methods. A single field is used when the compiler uses only one thread.

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## Sharded

# Enum Sharded

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    pub enum Sharded<T> {
        Single(Lock<T>),
        Shards(Box<[CacheAligned<Lock<T>>; 32]>),
    }

Expand description

An array of cache-line aligned inner locked structures with convenience methods. A single field is used when the compiler uses only one thread.

## Variants§

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### Single(Lock<T>)

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### Shards(Box<[CacheAligned<Lock<T>>; 32]>)

## Implementations§

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### impl<T> Sharded<T>

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#### pub fn new(value: impl FnMut() -> T) -> Self

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#### pub fn get_shard_by_value<K: Hash + ?Sized>(&self, val: &K) -> &Lock<T>

The shard is selected by hashing `val` with `FxHasher`.

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#### pub fn get_shard_by_hash(&self, hash: u64) -> &Lock<T>

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#### pub fn get_shard_by_index(&self, i: usize) -> &Lock<T>

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#### pub fn lock_shard_by_value<K: Hash + ?Sized>(&self, val: &K) -> LockGuard<'_, T>

The shard is selected by hashing `val` with `FxHasher`.

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#### pub fn lock_shard_by_hash(&self, hash: u64) -> LockGuard<'_, T>

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#### pub fn lock_shard_by_index(&self, i: usize) -> LockGuard<'_, T>

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#### pub fn lock_shards(&self) -> impl Iterator<Item = LockGuard<'_, T>>

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#### pub fn try_lock_shards(&self) -> impl Iterator<Item = Option<LockGuard<'_, T>>>

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### impl<K: Eq, V> Sharded<HashTable<(K, V)>>

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#### pub fn with_capacity(cap: usize) -> Self

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

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### impl<K: Eq + Hash, V> Sharded<HashTable<(K, V)>>

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#### pub fn get<Q>(&self, key: &Q) -> Option<V>
where K: Borrow<Q>, Q: Hash + Eq, V: Clone,

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#### pub fn get_or_insert_with(&self, key: K, default: impl FnOnce() -> V) -> V
where V: Copy,

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#### pub fn insert_unique(&self, key: K, value: V)

Insert value into the `ShardedHashMap` with unique key.

This function panics if debug_assertions are enabled and uniqueness is violated. If uniqueness is violated but debug_assertions are disabled then lookups will arbitrarily return one of the inserted elements.

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### impl<K: Eq + Hash + Copy> Sharded<HashTable<(K, ())>>

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#### pub fn intern_ref<Q>(&self, value: &Q, make: impl FnOnce() -> K) -> K
where K: Borrow<Q>, Q: Hash + Eq + ?Sized,

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#### pub fn intern<Q>(&self, value: Q, make: impl FnOnce(Q) -> K) -> K
where K: Borrow<Q>, Q: Hash + Eq,

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### impl<K: Eq + Hash + Copy + IntoPointer> Sharded<HashTable<(K, ())>>

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#### pub fn contains_pointer_to<T: Hash + IntoPointer>(&self, value: &T) -> bool

## Trait Implementations§

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### impl<T: Default> Default for Sharded<T>

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#### fn default() -> Self

Returns the “default value” for a type. Read more

## Auto Trait Implementations§

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### impl<T> DynSend for Sharded<T>
where T: DynSend,

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### impl<T> DynSync for Sharded<T>
where T: DynSend,

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### impl<T> !Freeze for Sharded<T>

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### impl<T> !RefUnwindSafe for Sharded<T>

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### impl<T> Send for Sharded<T>
where T: Send,

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### impl<T> !Sync for Sharded<T>

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### impl<T> Unpin for Sharded<T>
where T: Unpin,

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### impl<T> UnsafeUnpin for Sharded<T>
where T: UnsafeUnpin,

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### impl<T> UnwindSafe for Sharded<T>
where T: UnwindSafe,

## 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: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.