fix event_bus_test

src/sled/event_bus/event_bus.h

@@ -148,6 +148,8 @@ public:
         }
     }
 
+    EventBus *operator->() { return this; }
+
 private:
     sled::Mutex mutex_;
     std::unordered_map<std::type_index, std::function<void(EventBus *)>> cleanup_handlers_ GUARDED_BY(mutex_);

src/sled/event_bus/event_bus_test.cc

@@ -89,7 +89,7 @@ TEST_SUITE("EventBus")
             std::atomic<int> &data;
         };
 
-        struct AotmicEventSubscriber : public sled::EventBus::Subscriber {
+        struct AotmicEventSubscriber : public sled::EventBus::Subscriber<> {
             virtual ~AotmicEventSubscriber() = default;
 
             void OnEvent(AtomicEvent event) { event.data.fetch_add(1); }