Struct SetOnce

pub struct SetOnce<'a, T>(/* private fields */);

A write-once assignment interface for Deferred<T>.

SetOnce<'a, T> is a lightweight wrapper used to initialize a Deferred<T> exactly one time, enforcing single-assignment semantics.

You typically create it via SetOnce::from and assign a value using SetOnce::try_set.

Example

use deferred_cell::{Deferred, SetOnce};
use std::rc::Rc;

let deferred = Deferred::default();
let value = Rc::new(42);
SetOnce::from(&deferred).try_set(&value).unwrap();

Implementations

impl<'a, T> SetOnce<'a, T>

pub const fn from(cell: &'a Deferred<T>) -> Self

pub fn try_set(&self, value: &Rc<T>) -> Result<(), DeferredError>

pub fn can_set(&self) -> bool

Trait Implementations

impl<'a, T: Clone> Clone for SetOnce<'a, T>

fn clone(&self) -> SetOnce<'a, T>

Returns a duplicate of the value.

const fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a, T: Debug> Debug for SetOnce<'a, T>

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

Formats the value using the given formatter.