SDK: Add LifetimeComponent and LifetimeSystem

SDK/src/NDK/Systems/LifetimeSystem.cpp

@@ -0,0 +1,27 @@
+// Copyright (C) 2017 Jérôme Leclercq
+// This file is part of the "Nazara Development Kit"
+// For conditions of distribution and use, see copyright notice in Prerequisites.hpp
+
+#include <NDK/Systems/LifetimeSystem.hpp>
+#include <NDK/Components/LifetimeComponent.hpp>
+
+namespace Ndk
+{
+	LifetimeSystem::LifetimeSystem()
+	{
+		Requires<LifetimeComponent>();
+	}
+
+	void LifetimeSystem::OnUpdate(float elapsedTime)
+	{
+		for (const Ndk::EntityHandle& entity : GetEntities())
+		{
+			auto& lifetime = entity->GetComponent<LifetimeComponent>();
+
+			if (lifetime.UpdateLifetime(elapsedTime))
+				entity->Kill();
+		}
+	}
+
+	SystemIndex LifetimeSystem::systemIndex;
+}