add event provider interface

CMakeLists.txt

@@ -8,6 +8,8 @@ add_library(solanaceae_util
 
 	./solanaceae/util/simple_config_model.hpp
 	./solanaceae/util/simple_config_model.cpp
+
+	./solanaceae/util/event_provider.hpp
 )
 
 target_include_directories(solanaceae_util PUBLIC .)

solanaceae/util/event_provider.hpp

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <array>
+#include <vector>
+
+template<typename EventI>
+struct EventProviderI {
+	using enumType = typename EventI::enumType;
+
+	virtual ~EventProviderI(void) {};
+
+	// TODO: unsub
+	virtual void subscribe(EventI* object, const enumType event_type) {
+		_subscribers.at(size_t(event_type)).push_back(object);
+	}
+
+	protected:
+		template<typename T>
+		bool dispatch(enumType event_type, const T& event) {
+			for (auto* zei : _subscribers.at(size_t(event_type))) {
+				if (zei->onEvent(event)) {
+					return true;
+				}
+			}
+			return false;
+		}
+
+	protected:
+		std::array<
+			std::vector<EventI*>,
+			size_t(enumType::MAX)
+		> _subscribers;
+};
+