def advance

bendvy-ecs-core@0.1.0.4 · event_stream.bend:45

import Base
import bendvy-ecs-core@0.1.0.4/event_runtime.bend as Ev

45# Activate id if needed then advance its cursor to tick. Trusted completion
46# operation, not an independent registration/provenance validation.
47def advance(~S:Data,~E:Data,stream:Stream<S,E>,+id:U32,+tick:Nat) -> Stream<S,E>:
48  match stream:
49    case Stream{domain,batches,positions,nextReader,frameStart,boundary,capacity,dropped}:Stream{domain,batches,Ev.update(Ev.activate(positions,id,Nat.sub(tick,1n)),id,tick,False{}),nextReader,frameStart,boundary,capacity,dropped}