pub type EventPredicate = Arc<dyn Fn(&Event) -> bool + Send + Sync>;Expand description
A caller-supplied escape-hatch predicate (the predicate field
of EventFilter). Returns true to keep the event.
Contract (locking discipline, audit M1). The predicate is
evaluated under the bus mutex during the publish snapshot
phase, before the lock is dropped for delivery. It must be cheap
and MUST NOT re-enter the bus (no subscribe / publish /
subscription_count from inside it) – doing so would deadlock
on the inner mutex. Modes prefer the declarative path_glob /
major_modes fields (mode-architecture.md §7.4); predicate is
for the rare case those can’t express (init.rs custom rules).
Aliased Type§
pub struct EventPredicate { /* private fields */ }