Enum WriteOutcome 

pub enum WriteOutcome {
    Changed,
    Unchanged,
    Stale,
}

Result of attempting to write a property.

Three outcomes rather than the previous bool, because “the value is different” and “this write was allowed to happen at all” are separate questions once writes are ordered. Only Changed emits a notification.

Variants

Changed

Accepted, and the stored value is different than before.

Unchanged

Accepted, but the value was already what was written.

Stale

Rejected: a strictly newer observation is already stored.

Implementations

impl WriteOutcome

pub fn changed(self) -> bool

Whether this write changed the stored value (and so should notify).

Trait Implementations

impl Clone for WriteOutcome

fn clone(&self) -> WriteOutcome

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for WriteOutcome

impl Debug for WriteOutcome

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

Formats the value using the given formatter.

impl Eq for WriteOutcome

impl PartialEq for WriteOutcome

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for WriteOutcome