cast<RK, RV> method

Map<RK, RV> cast <RK, RV>()

Implementation 

Map<RK, RV> cast<RK, RV>() {
  Map<Object, Object> self = this;
  if (self is Map<RK, RV>) return self;
  return new UnmodifiableMapView<RK, RV>(_map.cast<RK, RV>());
}