EventDispatcher.dispatch

void onEvent(in Event e)
{
    Eventdispatcher ed = new EventDispatcher(e);
    ed.dispatch!MyEvent(delegate void(MyEvent event) { event.toString().writeln; });
}

void onEvent(in Event e)
{
    Eventdispatcher ed = new EventDispatcher(e);
    ed.dispatch!MyEvent((MyEvent event) { event.toString().writeln; });
}

auto func = (MyEvent event) { event.toString.writeln; };
void onEvent(in Event e)
{
    Eventdispatcher ed = new EventDispatcher(e);
    ed.dispatch!MyEvent(func);
}

void onMyEvent(MyEvent event) { event.toString.writeln; }
void onEvent(in Event e)
{
    import std.functional : toDelegate;
    Eventdispatcher ed = new EventDispatcher(e);
    ed.dispatch!MyEvent(toDelegate(&onMyEvent));
}