operator == method

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

The equality operator.

The default behavior for all Objects is to return true if and only if this 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 or return null.

  • 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.runtimeType != runtimeType) return false;
  final Polyline typedOther = other;
  return id == typedOther.id &&
      listEquals(points, typedOther.points) &&
      width == typedOther.width &&
      visible == typedOther.visible &&
      geodesic == typedOther.geodesic &&
      alpha == typedOther.alpha &&
      dashLineType == typedOther.dashLineType &&
      capType == typedOther.capType &&
      joinType == typedOther.joinType &&
      color == typedOther.color;
}