Struct Lazy 

pub struct Lazy<T, F = fn() -> T> { /* private fields */ }

A value built by F on first access.

Built on OnceCell::get_or_init_racy: threads that reach an unbuilt Lazy at the same moment each run F, one result is kept and the others are dropped, and nobody waits for anybody. F therefore runs at least once and possibly more than once, so it is Fn and should be free of side effects that must not repeat.

use nuclei::sync::Lazy;

static TABLE: Lazy<Vec<u32>> = Lazy::new(|| (0..4).collect());
assert_eq!(TABLE.len(), 4);

Implementations

impl<T, F> Lazy<T, F>

pub const fn new(init: F) -> Self

A Lazy that builds its value with init.

impl<T, F: Fn() -> T> Lazy<T, F>

pub fn force(this: &Self) -> &T

The value, building it if nobody has yet.

Trait Implementations

impl<T: Debug, F> Debug for Lazy<T, F>

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

Formats the value using the given formatter.

impl<T, F: Fn() -> T> Deref for Lazy<T, F>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.