when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. bool? statsInboundUplink,
    2. bool? statsInboundDownlink,
    3. bool? statsOutboundUplink,
    4. bool? statsOutboundDownlink,
    )
)

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs
TResult when<TResult extends Object?>(
  TResult Function(bool? statsInboundUplink, bool? statsInboundDownlink,
          bool? statsOutboundUplink, bool? statsOutboundDownlink)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _SystemPolicy():
      return $default(_that.statsInboundUplink, _that.statsInboundDownlink,
          _that.statsOutboundUplink, _that.statsOutboundDownlink);
    case _:
      throw StateError('Unexpected subclass');
  }
}