Struct Once 

pub struct Once<T> { /* private fields */ }

Wrapper presenting an async interface to a OnceCell.

Implementations

impl<T> Once<T>

pub fn new() -> Self

Constructor.

pub async fn get_or_init<'a, F>(&'a self, f: F) -> &'a T

where F: AsyncFnOnce() -> T,

Async wrapper around OnceCell’s get_or_init.

pub async fn get_or_try_init<'a, F, E>(&'a self, f: F) -> Result<&'a T, E>

where F: AsyncFnOnce() -> Result<T, E>,

Async wrapper around OnceCell’s get_or_try_init.

Trait Implementations

impl<T: Debug> Debug for Once<T>

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

Formats the value using the given formatter.

impl<T> Default for Once<T>

fn default() -> Self

Returns the “default value” for a type.