OnceCell

import { OnceCell } from "destack:sync";

One-time initialized cell.

export class OnceCell<T> {
    state: Atomic<uint32>;
    value: MaybeUninit<T>;
    get(): &readonly T | undefined;
    set(value: ^T): Result<void, ^T>;
    getOrInit(init: () => T): &readonly T;
    take(): T | undefined;
}
language/library/src/sync/once.ds:23:49

Members

state: Atomic<uint32>

The initialization state.

value: MaybeUninit<T>

The stored value.

get(): &readonly T | undefined

Get the initialized value.

set(value: ^T): Result<void, ^T>

Set the value once.

getOrInit(init: () => T): &readonly T

Get the value or initialize it.

take(): T | undefined

Move the value out when initialized.