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Locality

std::hint

Enum Locality 

#[non_exhaustive]
pub enum Locality {
    L3,
    L2,
    L1,
}
🔬This is a nightly-only experimental API. (hint_prefetch #146941)
Expand description

The expected temporal locality of a memory prefetch operation.

Locality expresses how likely the prefetched data is to be reused soon, and therefore which level of cache it should be brought into.

The locality is just a hint, and may be ignored on some targets or by the hardware.

Used with functions like prefetch_read and prefetch_write.

Variants (Non-exhaustive)§

This enum is marked as non-exhaustive
Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.
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L3

🔬This is a nightly-only experimental API. (hint_prefetch #146941)

Data is expected to be reused eventually.

Typically prefetches into L3 cache (if the CPU supports it).

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L2

🔬This is a nightly-only experimental API. (hint_prefetch #146941)

Data is expected to be reused in the near future.

Typically prefetches into L2 cache.

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L1

🔬This is a nightly-only experimental API. (hint_prefetch #146941)

Data is expected to be reused very soon.

Typically prefetches into L1 cache.

Trait Implementations§

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impl Clone for Locality

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fn clone(&self) -> Locality

Returns a duplicate of the value. Read more
1.0.0§

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

Performs copy-assignment from source. Read more
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impl Debug for Locality

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

Formats the value using the given formatter. Read more
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impl Hash for Locality

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fn hash<__H>(&self, state: &mut __H)
where __H: Hasher,

Feeds this value into the given Hasher. Read more
1.3.0§

fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for Locality

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

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

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Copy for Locality

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impl Eq for Locality

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impl StructuralPartialEq for Locality

Auto Trait Implementations§

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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit #126799)
Performs copy-assignment from self to dest. 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, 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> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. 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.