operator == method

@override bool operator ==(Object other)

Honour user-defined == so that interpreted instances compare correctly inside native Dart collections (e.g. Set<Cell>, Map<Cell, …>).

Dispatches through the active interpreter visitor when the script has declared an == operator on this class or any of its interpreted ancestors. When no override exists, or no visitor is active (e.g. the instance escaped d4rt's execution context), we fall back to native identity equality. Mirror of tom_d4rt InterpretedInstance.==.

Implementation

@override
bool operator ==(Object other) {
  if (identical(this, other)) return true;
  final eq = klass.findOperator('==');
  if (eq == null) return false;
  final visitor = D4.activeVisitor;
  if (visitor == null) return false;
  final id = identityHashCode(this);
  if (!_equalsInProgress.add(id)) {
    return false;
  }
  Object? result;
  try {
    result = eq.bind(this).call(visitor, <Object?>[other], const {});
  } on ReturnException catch (e) {
    result = e.value;
  } catch (_) {
    return false;
  } finally {
    _equalsInProgress.remove(id);
  }
  return result == true;
}