Struct Promise

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

A container for a value of type T that may not yet be resolved.

Multiple consumers may obtain the value via shared reference (&) once resolved.

Implementations

impl<T> Promise<T>

pub async fn wait(&self) -> Option<&T>

Waits for the promise to be resolved, returning the value once set.

Returns None if the resolver was dropped before sending a value.

pub fn try_get(&self) -> Result<&T, PromiseError>

Attempts to get the value if it has been resolved, returning an error if not.

Returns PromiseError::Empty if the value has not yet been set, and PromiseError::Dropped if the resolver was dropped before sending a value.