POC for entities.

Game/Entity/EntityManager.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <Core/Common/CoreTypes.h>
+
+namespace Game
+{
+    using EntityID = uint64_t;
+
+    struct Entity;
+    struct EntityManager
+    {
+        static EntityID ID;
+        // May be this should contains the allocator for each entity types
+    };
+
+    void InitEntityManager();\
+    EntityManager& GetEntityManager();
+    void RegisterEntity(EntityManager& manager, Entity* entity);
+}