/// <summary>
/// TBD
/// </summary>
/// <param name="subject">TBD</param>
/// <returns>TBD</returns>
public IActorRef Watch(IActorRef subject)
{
var a = (IInternalActorRef)subject;
if (!a.Equals(Self) && !WatchingContains(a))
{
MaintainAddressTerminatedSubscription(() =>
{
a.SendSystemMessage(new Watch(a, _self)); // ➡➡➡ NEVER SEND THE SAME SYSTEM MESSAGE OBJECT TO TWO ACTORS
_state = _state.AddWatching(a, Option <object> .None);
}, a);
}
return(a);
}
