Struct OneShot 

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

A cell holding a resource until something takes it, once.

ConnectorBuilder is Send + Sync and its build takes &self, so a connector holding a moved-in listener, peripheral or credential set must take it through interior mutability. spin::Mutex<Option<T>> is Send + Sync whenever T: Send, with no unsafe.

The T: Send bound is the contract: a type that is not Send cannot be held here, and that refusal is the signal to fix the type rather than to reach for unsafe impl.

Implementations

impl<T> OneShot<T>

pub fn new(value: T) -> Self

Hold value for a single take.

pub fn take(&self) -> Option<T>

Take the value, or None if it was already taken.

Trait Implementations

impl<T> Default for OneShot<T>

fn default() -> Self

An already-empty cell, for a resource that may never be supplied.

impl<T> From<T> for OneShot<T>

fn from(value: T) -> Self

Converts to this type from the input type.