Struct LastValue 

pub struct LastValue;

Overwrite channel: each write replaces the value (last-value semantics).

Rejects concurrent same-step writes from multiple branches with crate::TinyAgentsError::InvalidConcurrentUpdate.

Trait Implementations

impl Channel for LastValue

fn kind(&self) -> &'static str

A short, stable kind tag used for debugging and topology export.

fn merge(&self, _current: Option<&Value>, incoming: Value) -> Result<Value>

Folds incoming into the channel’s current value, returning the new value. current is None the first time the channel is written.

fn clone_box(&self) -> Box<dyn Channel>

Clones the channel into a fresh box (enables Clone for ChannelSet).

fn allows_concurrent(&self) -> bool

Whether more than one concurrent branch may write this channel within a single superstep. Aggregates (append/fold/accumulate/barrier) return true; overwrite-style channels return false and trigger crate::TinyAgentsError::InvalidConcurrentUpdate on a same-step clash.

fn is_ephemeral(&self) -> bool

Whether the channel’s value is cleared at the start of the next step.

fn is_tracked(&self) -> bool

Whether the channel participates in ChannelSet::snapshot / durable state. Untracked returns false.

fn is_ready(&self, _current: Option<&Value>) -> bool

Barrier readiness: whether the channel has received all the inputs it is waiting for. Non-barrier channels are always ready.

impl Clone for LastValue

fn clone(&self) -> LastValue

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LastValue

impl Debug for LastValue

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

Formats the value using the given formatter.

impl Default for LastValue

fn default() -> LastValue

Returns the “default value” for a type.