when<TResult extends Object?> method

@optionalTypeArgs TResult when<TResult extends Object?>(TResult $default(List<StrategyWeight>? costs, List<XrayDuration>? baselines, int? expected, XrayDuration? maxRTT, double? tolerance,))

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(List<StrategyWeight>? costs, List<XrayDuration>? baselines,
          int? expected, XrayDuration? maxRTT, double? tolerance)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _StrategyLeastLoadConfig():
      return $default(_that.costs, _that.baselines, _that.expected,
          _that.maxRTT, _that.tolerance);
    case _:
      throw StateError('Unexpected subclass');
  }
}