Struct WriteOutcomeTracker 

pub struct WriteOutcomeTracker(AtomicU8);

Tracks, for a single tracked outbound write, whether retrying after a non-success outcome risks sending the same frame twice. A plain success/failure Result isn’t enough for this: once a frame is handed to run_writer it will be delivered independent of anything that happens afterward to the caller’s future, including that future being dropped/cancelled before it ever observes an outcome — a case a Result alone can’t represent, but which a caller’s own Drop glue can still consult here (ReAgent P1, PR #3212 6th review).

Tuple Fields

0: AtomicU8

Implementations

impl WriteOutcomeTracker

const NOT_QUEUED: u8 = 0

const OUTCOME_UNCONFIRMED: u8 = 1

const CONFIRMED_UNDELIVERED: u8 = 2

pub fn new() -> Self

fn mark_queued(&self)

fn mark_confirmed_undelivered(&self)

pub fn safe_to_retry(&self) -> bool

True if the frame was never queued, or was queued and its delivery is now confirmed to have failed — in both cases nothing was, or ever will be, delivered, so sending again cannot produce a duplicate. False once queued but unconfirmed, which also covers a confirmed success (obviously never safe to retry either).

Trait Implementations

impl Debug for WriteOutcomeTracker

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

Formats the value using the given formatter.