operator == method

  1. @override
bool operator ==(
  1. Object other
)

The equality operator.

The default behavior for all Objects is to return true if and only if this object and other are the same object.

Override this method to specify a different equality relation on a class. The overriding method must still be an equivalence relation. That is, it must be:

  • Total: It must return a boolean for all arguments. It should never throw.

  • Reflexive: For all objects o, o == o must be true.

  • Symmetric: For all objects o1 and o2, o1 == o2 and o2 == o1 must either both be true, or both be false.

  • Transitive: For all objects o1, o2, and o3, if o1 == o2 and o2 == o3 are true, then o1 == o3 must be true.

The method should also be consistent over time, so whether two objects are equal should only change if at least one of the objects was modified.

If a subclass overrides the equality operator, it should override the hashCode method as well to maintain consistency.

Implementation

@override
bool operator ==(Object other) {
  if (identical(this, other)) return true;
  if (other is! RoadSign) return false;
  RoadSign _other = other;
  return offsetInMeters == _other.offsetInMeters &&
      travelDirection == _other.travelDirection &&
      roadSignType == _other.roadSignType &&
      roadSignCategory == _other.roadSignCategory &&
      isPrioritySign == _other.isPrioritySign &&
      generalWarningType == _other.generalWarningType &&
      DeepCollectionEquality().equals(vehicleTypes, _other.vehicleTypes) &&
      weatherType == _other.weatherType &&
      localizedSignValue == _other.localizedSignValue &&
      localizedPreWarning == _other.localizedPreWarning &&
      localizedDuration == _other.localizedDuration &&
      localizedValidityTime == _other.localizedValidityTime;
}