Adding an event system

sources/System/Event/EventSystem.cpp

@@ -0,0 +1,28 @@
+//
+// Created by Zoe Roux on 6/1/21.
+//
+
+#include "EventSystem.hpp"
+
+namespace BBM
+{
+	EventSystem::EventSystem()
+		: WAL::System({})
+	{}
+
+	void EventSystem::dispatchEvent(const std::function<void(WAL::Entity &)> &event)
+	{
+		this->_events.emplace_back(event);
+	}
+
+	void EventSystem::onUpdate(WAL::Entity &entity, std::chrono::nanoseconds)
+	{
+		for (auto &event : this->_events)
+			event(entity);
+	}
+
+	void EventSystem::onSelfUpdate()
+	{
+		this->_events.clear();
+	}
+}

sources/System/Event/EventSystem.hpp

@@ -0,0 +1,36 @@
+//
+// Created by Zoe Roux on 6/1/21.
+//
+
+#pragma once
+
+#include <System/System.hpp>
+#include <vector>
+#include <functional>
+
+namespace BBM
+{
+	class EventSystem : public WAL::System
+	{
+	private:
+		//! @brief The list of events that occurred in the last update.
+		std::vector<std::function<void (WAL::Entity &)>> _events;
+	public:
+		//! @brief Inform the system that a new event has occurred and it should run the given method on every entities.
+		void dispatchEvent(const std::function<void (WAL::Entity &)>& event);
+
+		//! @inherit
+		void onUpdate(WAL::Entity &entity, std::chrono::nanoseconds dtime) override;
+		//! @inherit
+		void onSelfUpdate() override;
+
+		//! @brief A default constructor
+		EventSystem();
+		//! @brief An event system is copy constructable.
+		EventSystem(const EventSystem &) = default;
+		//! @brief A default destructor
+		~EventSystem() override = default;
+		//! @brief An event system is not assignable.
+		EventSystem &operator=(const EventSystem &) = delete;
+	};
+}