Struct Cache

struct Cache(AtomicUsize);

🔬This is a nightly-only experimental API. (stdarch_internal)

Feature cache with capacity for size_of::<usize>() * 8 - 1 features.

Note: 0 is used to represent an uninitialized cache, and (at least) the most significant bit is set on any cache which has been initialized.

Note: we use Relaxed atomic operations, because we are only interested in the effects of operations on a single memory location. That is, we only need “modification order”, and not the full-blown “happens before”.

Tuple Fields

0: AtomicUsize

🔬This is a nightly-only experimental API. (stdarch_internal)

Implementations

impl Cache

const CAPACITY: u32 = 63u32

🔬This is a nightly-only experimental API. (stdarch_internal)

const MASK: usize = 9_223_372_036_854_775_807usize

🔬This is a nightly-only experimental API. (stdarch_internal)

const INITIALIZED_BIT: usize = 9_223_372_036_854_775_808usize

🔬This is a nightly-only experimental API. (stdarch_internal)

const fn uninitialized() -> Self

🔬This is a nightly-only experimental API. (stdarch_internal)

Creates an uninitialized cache.

pub(crate) fn test(&self, bit: u32) -> Option<bool>

🔬This is a nightly-only experimental API. (stdarch_internal)

Is the bit in the cache set? Returns None if the cache has not been initialized.

fn initialize(&self, value: usize) -> usize

🔬This is a nightly-only experimental API. (stdarch_internal)

Initializes the cache.