Struct ObserverRegistry 

pub struct ObserverRegistry { /* private fields */ }

The set of registered observers.

The layout cache and the model indices are ordinary members of this set; they hold no privileged path into the model.

Implementations

impl ObserverRegistry

pub const fn new() -> Self

Empty registry.

pub fn register(&mut self, observer: Arc<dyn AstObserver>) -> ObserverToken

Register an observer, returning the token that removes it again.

pub fn unregister(&mut self, token: ObserverToken) -> bool

Remove an observer. Returns whether it was registered.

pub fn len(&self) -> usize

Number of registered observers.

pub fn is_empty(&self) -> bool

Whether no observer is registered.

pub fn notify(&self, changeset: &Changeset)

Notify every observer, in registration order.

Called only after a successful commit. A commit that changed nothing still notifies with an empty changeset, so a consumer tracking sequence numbers sees no gaps.

Trait Implementations

impl Clone for ObserverRegistry

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ObserverRegistry

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

Formats the value using the given formatter.

impl Default for ObserverRegistry

fn default() -> Self

Returns the “default value” for a type.