EventDispatcher

EventDispatcher<T> provides a compile-time dispatch mechanism that routes events to the appropriate subscriber method without relying on virtual functions or dynamic casting.

template <typename T>
struct EventDispatcher;

template <typename T>
struct EventDispatcher<pool::Handle<T>> {
  static void dispatch(const pool::Handle<T>& ev, typename T::Listener& sub);
};

// Specializations for each event type...

Purpose

• Deliver strongly-typed events (BookUpdateEvent, TradeEvent, etc.) to their matching handler methods on subscribers, using static dispatch.

Responsibilities

Specialization	Routed To
BookUpdateEvent	IMarketDataSubscriber::onBookUpdate()
TradeEvent	IMarketDataSubscriber::onTrade()
CandleEvent	IMarketDataSubscriber::onCandle()
OrderEvent	IOrderExecutionListener::onOrderFilled() via dispatchTo()
pool::Handle<T>	Unwraps and forwards to EventDispatcher<T>

Notes

• Eliminates virtual overhead in EventBus by avoiding event->dispatchTo() directly.
• Pooled events (pool::Handle<T>) are transparently unwrapped and dispatched.
• Extensible — any new event type must define a matching specialization.
• Dispatch is strictly type-safe and resolved at compile time.