ludic/docs/language/networking/fn-is_owner.md
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 17:53:22 +03:00

1.3 KiB

id name category kind tokens sig tip order
fn-is_owner is_owner networking builtin is_owner is_owner(target) -> bool Whether the local peer owns a model instance. 50

is_owner reports whether the local peer owns a given model instance — it compares the instance's stored owner (see owner) against local_id and returns the result. It only makes sense for instances of an @Owned model, and it is what @Predicted handler dispatch consults to decide whether the owning client should run a control handler speculatively. Prefer this over reading owner and comparing ids yourself. A freshly spawned, unowned instance returns false everywhere until the authority assigns it with set_owner.

Parameters:

  • target — the model instance (an entity) to test
program CheckOwnership {
  @Sync property Position { column: int = 0, row: int = 0 }
  @Owned model Player { @Sync Position }

  entry {
    spawn Player { Position { column: 5, row: 6 } }
    for (Position) in query [Position, {Player}] {
      let player_id = self()
      set_owner(player_id, 7)
      print(is_owner(player_id))       # 0 — local id 0 does not own peer 7's instance
      set_owner(player_id, 0)
      print(is_owner(player_id))       # 1 — now the local peer owns it
    }
  }
}