Struct EventContributions 

pub struct EventContributions { /* private fields */ }

The per-plugin accumulator the events::Host impl records into during register-events (lib.rs). Held in PluginState; drained by the host after the registration export returns (PH7.8c). record is the sync host-func body (it only pushes — it cannot trap), factored here (the GrammarContributions precedent) so recording is unit-testable without a PluginState / guest.

Implementations

impl EventContributions

pub fn record(&mut self, filter: WitEventFilter, handler: u32)

Record a subscription (the events.subscribe host-func body).

pub fn len(&self) -> usize

How many subscriptions were recorded.

pub fn is_empty(&self) -> bool

True when the plugin subscribed to nothing (the degenerate case — a non-observing plugin, or one whose register-events is empty).

pub fn take(&mut self) -> Vec<RecordedSubscription>

Drain the recorded subscriptions, leaving the accumulator empty. Called by the host after register-events returns (PH7.8c) to wire the bus.

Trait Implementations

impl Default for EventContributions

fn default() -> EventContributions

Returns the “default value” for a type.