Enum ReadOutcome 

pub enum ReadOutcome {
    Bytes(NonZeroUsize),
    Pending(PendingReason),
    Eof,
}

Outcome of a Source::read_at call.

Each variant has distinct caller semantics — there is no overload of a numeric zero. Bytes carries a typed NonZeroUsize so the type system guarantees forward progress; Pending carries an explicit PendingReason; Eof is terminal.

Variants

Bytes(NonZeroUsize)

Source produced count bytes (count > 0 by construction).

Pending(PendingReason)

Source did not make progress this call. See PendingReason for the precise cause and required caller action.

Eof

Natural end of stream — no more bytes will ever come from this source at this offset.

Trait Implementations

impl Clone for ReadOutcome

fn clone(&self) -> ReadOutcome

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ReadOutcome

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

Formats the value using the given formatter.

impl PartialEq for ReadOutcome

fn eq(&self, other: &ReadOutcome) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for ReadOutcome

impl Eq for ReadOutcome

impl StructuralPartialEq for ReadOutcome