public DemoSubject()
{
var oo = new OperationObserver();
// subject is both an observer and observable
var market = new Subject <float>();
// note also the overloads of this!
market.Subscribe(this);
//market.Subscribe(this); // it is possible to subscribe twice. All events will be duplicated.
market.OnNext(123);
market.Subscribe(oo); // late subscription
market.OnNext(456);
market.OnCompleted();
market.OnNext(321.123f); // this will not work
Console.WriteLine($"market.HasObservers? {market.HasObservers}"); // nope
}
//accept a new observer
//note that this design pattern (Observer Pattern) is used to neatly transport information between loosely coupled objects
public void addObserver(OperationObserver observer)
{
observers.Add(observer);
}